阅读说明：本技术 燃油加热器的控制方法和控制系统、机动车及存储介质 (Control method and control system for fuel heater, motor vehicle and storage medium ) 是由 罗石 于 2020-04-01 设计创作，主要内容包括：本申请提供了一种燃油加热器的控制方法和控制系统、机动车及存储介质,控制方法包括：接收燃油加热器中燃烧室的缸内温度信息、燃烧室的缸外温度信息、出液口的温度信息、风扇电机的转速信息、风扇电机的电流信息以及点火塞的电阻信息；若确定出燃烧室的缸内温度值、燃烧室的缸外温度值和出液口的温度值之间的关系满足预设温度关系条件、确定出风扇电机的转速值满足预设转速条件、确定风扇电机的电流值满足预设电流条件以及确定出点火塞的电阻值满足预设电阻条件,则判定燃油加热器发生失火问题；调整风扇的电机转速、喷油泵的喷油频率和点火塞的电阻值中的至少一项,使得燃油加热器恢复至着火状态,从而降低失火问题对燃油加热器的不良影响。(The application provides a control method and a control system of a fuel heater, a motor vehicle and a storage medium, wherein the control method comprises the following steps: receiving in-cylinder temperature information of a combustion chamber in a fuel heater, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotating speed information of a fan motor, current information of the fan motor and resistance information of an ignition plug; if the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meet the preset temperature relation condition, the rotating speed value of the fan motor meets the preset rotating speed condition, the current value of the fan motor meets the preset current condition and the resistance value of the ignition plug meets the preset resistance condition, the problem that the fuel heater catches fire is judged; and adjusting at least one of the rotating speed of a motor of the fan, the oil injection frequency of the oil injection pump and the resistance value of the ignition plug, so that the fuel oil heater is recovered to be in an ignition state, and the adverse effect of the fire catching problem on the fuel oil heater is reduced.)

1. A method of controlling a fuel heater, comprising:

receiving in-cylinder temperature information of a combustion chamber in the fuel heater, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotating speed information of a fan motor, current information of the fan motor and resistance information of an ignition plug;

if the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meet the preset temperature relation condition, the rotating speed value of the fan motor meets the preset rotating speed condition, the current value of the fan motor meets the preset current condition and the resistance value of the ignition plug meets the preset resistance condition, the problem that the fuel heater catches fire is judged;

and adjusting at least one of the motor speed of the fan, the oil injection frequency of the oil injection pump and the resistance value of the ignition plug so that the fuel oil heater is restored to the ignition state.

2. The control method according to claim 1, wherein when the fuel heater is in the first operation stage, the determining that the relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet satisfies a preset temperature relationship condition includes:

determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving a ratio of the first temperature difference to a preset time unit;

determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference;

and when the ratio of the first temperature difference to a preset time unit exceeds a first reference ratio and the difference value of the first temperature difference and the second temperature difference exceeds a first reference temperature value, determining that the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition.

3. The control method of claim 1, wherein when the fuel heater is in the first operation stage, the determining that the rotation speed value of the fan motor satisfies a preset rotation speed condition comprises: when the rotating speed value of the fan motor exceeds a first reference rotating speed value, determining that the rotating speed value of the fan motor meets a preset rotating speed condition;

when the fuel oil heater is in a first working stage, the determining that the current value of the fan motor meets a preset current condition includes: and when the current value of the fan motor is in a first reference current range, determining that the current value of the fan motor meets a preset current condition.

4. The control method of claim 1, wherein said determining that the resistance value of the ignition plug satisfies a preset resistance condition when the fuel heater is in the first operation stage comprises:

and when the resistance value of the ignition plug is in a first reference resistance value range and continuously keeps the preset duration, determining that the resistance value of the ignition plug meets a preset resistance condition.

5. The control method of claim 1, wherein said adjusting at least one of a motor speed of said fan, a fuel injection frequency of a fuel injection pump, and a resistance value of said ignition plug when said fuel heater is in a first operating phase comprises:

and adjusting the motor speed of the fan to change the air inlet amount in the combustion chamber, and/or adjusting the oil injection frequency of the oil injection pump to change the fuel oil inlet amount in the combustion chamber, so that the preset air-fuel ratio in the combustion chamber is achieved.

6. The control method according to claim 1, wherein when the fuel heater is in the second operation stage, the determining that the relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet satisfies a preset temperature relationship condition includes:

determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving a ratio of the first temperature difference to a preset time unit;

determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference;

and when the ratio of the first temperature difference to a preset time unit exceeds a second reference ratio and the difference value of the first temperature difference and the second temperature difference exceeds a second reference temperature value, determining that the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition.

7. The control method of claim 1, wherein when the fuel heater is in the second operation stage, the determining that the rotation speed value of the fan motor satisfies a preset rotation speed condition comprises: when the rotating speed value of the fan motor exceeds a second reference rotating speed value, determining that the rotating speed value of the fan motor meets a preset rotating speed condition;

when the fuel oil heater is in a first working stage, the determining that the current value of the fan motor meets a preset current condition includes: and when the current value of the fan motor is in a second reference current range, determining that the current value of the fan motor meets a preset current condition.

8. The control method of claim 1, wherein said determining that the resistance value of the ignition plug satisfies a preset resistance condition when the fuel heater is in the second operation stage comprises: and when the resistance value of the ignition plug is in a second reference resistance value range and continuously keeps the preset duration, determining that the resistance value of the ignition plug meets a preset resistance condition.

9. The control method of claim 1, wherein said adjusting at least one of a motor speed of said fan, a fuel injection frequency of a fuel injection pump, and a resistance value of said ignition plug when said fuel heater is in a second phase of operation comprises: and adjusting the correction control coefficient of the resistance value of the ignition plug so that the resistance value of the ignition plug is kept within a target resistance value range.

10. A control system for a fuel heater, comprising:

the first temperature sensor is arranged inside a combustion chamber of the fuel heater and used for detecting in-cylinder temperature information of the combustion chamber;

the second temperature sensor is arranged outside a combustion chamber of the fuel oil heater and used for detecting out-of-cylinder temperature information of the combustion chamber;

the third temperature sensor is arranged at a liquid outlet of the fuel oil heater and used for detecting the temperature information of the liquid outlet;

the first detection module is electrically connected with a fan motor of the fuel heater and used for detecting the rotating speed information of the fan motor;

the second detection module is electrically connected with an ignition plug of the fuel heater and used for detecting resistance information of the ignition plug;

the controller is respectively connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the first detection module, the second detection module, the fan motor and the ignition plug; the controller is configured to execute a control method of the fuel heater according to any one of claims 1 to 9.

11. A motor vehicle, comprising: a fuel heater, a battery pack, and a control system for a fuel heater according to claim 10;

the first temperature sensor of the control system of the fuel oil heater is arranged inside a combustion chamber of the fuel oil heater;

the second temperature sensor of the control system of the fuel oil heater is arranged outside the combustion chamber of the fuel oil heater;

the third temperature sensor of the control system of the fuel oil heater is arranged at the liquid outlet of the fuel oil heater;

the first detection module of the control system of the fuel oil heater is electrically connected with the fan motor of the fuel oil heater;

the second detection module of the control system of the fuel oil heater is electrically connected with an ignition plug of the fuel oil heater;

the controller of the control system of the fuel oil heater is respectively connected with the fan motor and the ignition plug;

the liquid outlet of the fuel oil heater is communicated with the liquid inlet of the battery pack, and the liquid inlet of the fuel oil heater is communicated with the liquid outlet of the battery pack.

12. A computer-readable storage medium storing a computer program which, when executed by a control system of a fuel heater, implements a control method of the fuel heater according to any one of claims 1 to 9.

Technical Field

The application relates to the technical field of fuel heaters of automobiles, in particular to a control method and a control system of a fuel heater, a motor vehicle and a storage medium.

Background

As a heating apparatus, a fuel heater has been widely used in more and more fields (e.g., electric vehicles). The fuel heater generally comprises three power components, namely a fan motor, a point piston and a fuel injection pump, and the three power components work in a linkage mode to enable the fuel heater to operate under corresponding working conditions.

However, the existing control method of the fuel heater has many defects, which easily causes the fuel heater to fail to operate normally after a fire problem occurs, and affects the normal use of the fuel heater.

Disclosure of Invention

The application aims at the defects of the existing mode and provides a control method and a control system of a fuel heater, a motor vehicle and a storage medium, and the technical problem that the fuel heater cannot normally operate after a fire accident occurs in the prior art is solved.

In a first aspect, an embodiment of the present application provides a control method for a fuel heater, including:

receiving in-cylinder temperature information of a combustion chamber in a fuel heater, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotating speed information of a fan motor, current information of the fan motor and resistance information of an ignition plug;

if the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meet the preset temperature relation condition, the rotating speed value of the fan motor meets the preset rotating speed condition, the current value of the fan motor meets the preset current condition and the resistance value of the ignition plug meets the preset resistance condition, the problem that the fuel heater catches fire is judged;

and adjusting at least one of the motor speed of the fan, the oil injection frequency of the oil injection pump and the resistance value of the ignition plug so that the fuel oil heater is restored to the ignition state.

In an embodiment of the present application, when the fuel oil heater is in the first working stage, it is determined that a relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet satisfies a preset temperature relationship condition, including:

determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving the ratio of the first temperature difference to a preset time unit;

determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference;

and when the ratio of the first temperature difference to the preset time unit exceeds a first reference ratio and the difference value of the first temperature difference and the second temperature difference exceeds a first reference temperature value, determining that the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition.

In one embodiment of the present application, when the fuel heater is in the first operation stage, determining that the rotation speed value of the fan motor meets the preset rotation speed condition includes: when the rotating speed value of the fan motor exceeds the first reference rotating speed value, determining that the rotating speed value of the fan motor meets a preset rotating speed condition;

when the fuel oil heater is in a first working stage, determining that the current value of the fan motor meets a preset current condition, wherein the method comprises the following steps: and when the current value of the fan motor is in the first reference current range, determining that the current value of the fan motor meets a preset current condition.

In one embodiment of the present application, determining that the resistance value of the ignition plug satisfies the predetermined resistance condition when the fuel heater is in the first operation stage includes:

and when the resistance value of the ignition plug is in the first reference resistance value range and continuously keeps the preset duration, determining that the resistance value of the ignition plug meets the preset resistance condition.

In one embodiment of the present application, adjusting at least one of a motor speed of a fan, a fuel injection frequency of a fuel injection pump, and a resistance value of an ignition plug when the fuel heater is in the first operation stage includes:

and adjusting the rotating speed of a motor of the fan to change the air inlet amount in the combustion chamber, and/or adjusting the oil injection frequency of an oil injection pump to change the fuel oil inlet amount in the combustion chamber, so that the preset air-fuel ratio in the combustion chamber is achieved.

In an embodiment of the present application, when the fuel oil heater is in the second working phase, it is determined that a relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet satisfies a preset temperature relationship condition, including:

determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving the ratio of the first temperature difference to a preset time unit;

determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference;

and when the ratio of the first temperature difference to the preset time unit exceeds a second reference ratio and the difference value of the first temperature difference and the second temperature difference exceeds a second reference temperature value, determining that the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition.

In one embodiment of the present application, when the fuel heater is in the second operation stage, determining that the rotation speed value of the fan motor meets the preset rotation speed condition includes: when the rotating speed value of the fan motor exceeds the second reference rotating speed value, determining that the rotating speed value of the fan motor meets a preset rotating speed condition;

when the fuel oil heater is in a first working stage, determining that the current value of the fan motor meets a preset current condition, wherein the method comprises the following steps: and when the current value of the fan motor is in the second reference current range, determining that the current value of the fan motor meets the preset current condition.

In one embodiment of the present application, determining that the resistance value of the ignition plug satisfies the predetermined resistance condition when the fuel heater is in the second operation stage includes: and when the resistance value of the ignition plug is in the second reference resistance value range and continuously keeps the preset duration, determining that the resistance value of the ignition plug meets the preset resistance condition.

In one embodiment of the present application, when the fuel heater is in the second operation stage, adjusting at least one of a motor speed of the fan, a fuel injection frequency of the fuel injection pump, and a resistance value of the ignition plug includes:

the correction control coefficient of the resistance value of the ignition plug is adjusted so that the resistance value of the ignition plug is maintained within the target resistance value range.

In a second aspect, an embodiment of the present application provides a control system for a fuel heater, including:

the first temperature sensor is arranged inside a combustion chamber of the fuel heater and used for detecting in-cylinder temperature information of the combustion chamber;

the second temperature sensor is arranged outside the combustion chamber of the fuel heater and used for detecting the temperature information outside the combustion chamber;

the third temperature sensor is arranged at a liquid outlet of the fuel heater and used for detecting the temperature information of the liquid outlet;

the first detection module is electrically connected with a fan motor of the fuel heater and used for detecting the rotating speed information of the fan motor;

the second detection module is used for being electrically connected with an ignition plug of the fuel heater and detecting resistance information of the ignition plug;

the controller is respectively connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the first detection module, the second detection module, the fan motor and the ignition plug; the controller is used for executing the control method of the fuel heater provided by the embodiment of the application.

In a third aspect, an embodiment of the present application provides an automotive vehicle, including: the fuel heater, the battery pack and the control system of the fuel heater provided by the embodiment of the application are provided;

the first temperature sensor of the control system of the fuel oil heater is arranged inside a combustion chamber of the fuel oil heater;

the second temperature sensor of the control system of the fuel oil heater is arranged outside the combustion chamber of the fuel oil heater;

the third temperature sensor of the control system of the fuel heater is arranged at the liquid outlet of the fuel heater;

the first detection module of the control system of the fuel heater is electrically connected with a fan motor of the fuel heater;

the second detection module of the control system of the fuel heater is electrically connected with an ignition plug of the fuel heater;

the controller of the control system of the fuel heater is respectively connected with the fan motor and the ignition plug;

the liquid outlet of the fuel oil heater is communicated with the liquid inlet of the battery pack, and the liquid inlet of the fuel oil heater is communicated with the liquid outlet of the battery pack.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a control system of a fuel heater, the control method of the fuel heater provided by the embodiment of the present application is implemented.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects:

in the embodiment of the application, whether the fuel heater catches fire or not is accurately diagnosed in time by utilizing a plurality of items of state information (such as in-cylinder temperature information of a combustion chamber, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotating speed information of a fan motor, current information of the fan motor and resistance information of an ignition plug) in the fuel heater, and when the fuel heater catches fire, the fuel heater can be quickly restored to the fire state by adjusting the rotating speed of the fan motor, the oil injection frequency of an oil injection pump or the resistance value of the ignition plug. The control method of the fuel oil heater provided by the embodiment of the application can greatly reduce the adverse effect of the fire problem on the fuel oil heater, and is favorable for ensuring the efficient use of the fuel oil heater.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flow chart illustrating a control method of a fuel heater according to an embodiment of the present disclosure;

FIG. 2 is a flow chart illustrating the operation of a fuel heater according to an embodiment of the present disclosure;

FIG. 3 is a schematic flow chart illustrating a method for controlling a fuel heater during a first phase of operation of the fuel heater according to an embodiment of the present disclosure;

FIG. 4 is a schematic flow chart illustrating a method for controlling a fuel heater during a second phase of operation of the fuel heater according to an embodiment of the present disclosure;

fig. 5 is an architecture diagram of a control system of a fuel heater according to an embodiment of the present application.

The reference numerals are explained as follows:

400-control system of fuel heater;

1-a first temperature sensor; 2-a second temperature sensor; 3-a third temperature sensor;

4-a first detection module; 5-a second detection module; 6-a controller.

Detailed Description

Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.

Those skilled in the art will appreciate that fuel heaters typically include three power components, a fan motor, a point piston, and a fuel injection pump. The fan motor is used for driving the fan to input air into the combustion chamber, the air inlet amount in the combustion chamber can be controlled by adjusting the rotating speed of the fan motor, the fuel injection pump is used for injecting fuel into the combustion chamber, and the point piston is used for igniting the fuel in the combustion chamber. The fuel oil heater is also provided with a liquid path system, when fuel oil in the combustion chamber is combusted, liquid (such as water) in the liquid path system can be heated, and the heated liquid can flow out of the fuel oil heater through a liquid outlet of the liquid path system and is transmitted to a specified component to heat an execution component.

The embodiment of the application provides a control method of a fuel heater, which can control the working process of the fuel heater, and also provides a control system of the fuel heater, which is used for executing the control method of the fuel heater. The control system of the fuel oil heater comprises a controller, and the controller is an execution main body of the control method of the fuel oil heater.

A schematic flow chart of a control method of a fuel heater provided in an embodiment of the present application is shown in fig. 1, and includes:

s101: receiving in-cylinder temperature information of a combustion chamber in the fuel heater, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotational speed information of a fan motor, current information of the fan motor, and resistance information of an ignition plug.

S102: if the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meet the preset temperature relation condition, the rotating speed value of the fan motor meets the preset rotating speed condition, the current value of the fan motor meets the preset current condition and the resistance value of the ignition plug meets the preset resistance condition, the problem that the fuel heater catches fire is judged;

s103: and adjusting at least one of the motor speed of the fan, the oil injection frequency of the oil injection pump and the resistance value of the ignition plug so that the fuel oil heater is restored to the ignition state.

It should be noted that, in the embodiment of the present application, the problem of fire catching of the fuel heater means that the fuel heater has insufficient combustion, black smoke or carbon deposition. The carbon deposition means the black carbon accumulation of the fuel heater caused by insufficient combustion, and the black carbon accumulation can block the exhaust port

In the control method of the fuel heater provided by the embodiment of the application, whether the fuel heater catches fire or not is accurately diagnosed in time by utilizing a plurality of items of state information (such as in-cylinder temperature information of a combustion chamber, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotating speed information of a fan motor, current information of the fan motor and resistance information of an ignition plug) in the fuel heater, and when the fuel heater catches fire is judged, the fuel heater can be quickly restored to the catching fire state by adjusting the rotating speed of the motor of the fan, the oil injection frequency of an oil injection pump or the resistance value of the ignition plug. The control method of the fuel oil heater can greatly reduce the adverse effect of the fire problem on the fuel oil heater, and is beneficial to ensuring the efficient use of the fuel oil heater.

After the fuel heater receives the start command, the fuel heater may sequentially pass through a plurality of operating conditions, as shown in fig. 2, where the plurality of operating conditions may include a fuel heater start-up stage, a fuel heater normal operation stage, a fuel heater fast operation stage, a fuel heater slow-down operation stage, and a fuel heater stop operation stage.

The inventor of the present application has found that the fire problems occur mainly due to insufficient intake air, too fast heating of the ignition plug, too fast injection frequency, etc., and the fire problems of the fuel heater generally occur in the normal operation stage of the fuel heater and the fast operation stage of the fuel heater. In the embodiment of the application, the first working stage in the subsequent content is a normal operation stage of the fuel heater, and the second working stage in the subsequent content is a rapid operation stage of the fuel heater. The control method of the fuel heater in the first operation stage and the control method in the second operation stage will be further described below.

In this embodiment of the present application, when the fuel oil heater is in the first working stage, it is determined in step S102 that the relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet satisfies the preset temperature relationship condition, which includes:

determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving the ratio of the first temperature difference to a preset time unit;

determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference;

and when the ratio of the first temperature difference to the preset time unit exceeds a first reference ratio and the difference value of the first temperature difference and the second temperature difference exceeds a first reference temperature value, determining that the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition.

Alternatively, the in-cylinder temperature value of the combustion chamber may be a temperature of an inner wall of the combustion chamber, and the out-of-cylinder temperature value of the combustion chamber may be a temperature of an outer wall of the combustion chamber.

In the embodiment of the present application, when the fuel oil heater is in the first operation stage, the step S102 determines that the rotation speed value of the fan motor meets the preset rotation speed condition, which includes: and when the rotating speed value of the fan motor exceeds the first reference rotating speed value, determining that the rotating speed value of the fan motor meets a preset rotating speed condition.

Determining that the current value of the fan motor meets the preset current condition in step S102 includes: and when the current value of the fan motor is in the first reference current range, determining that the current value of the fan motor meets a preset current condition.

In the embodiment of the present application, when the fuel heater is in the first operation stage, the determining in step S102 that the resistance value of the ignition plug satisfies the preset resistance condition includes: and when the resistance value of the ignition plug is in the first reference resistance value range and continuously keeps the preset duration, determining that the resistance value of the ignition plug meets the preset resistance condition.

In the embodiment of the present application, when the fuel heater is in the first operation stage, adjusting at least one of the motor speed of the fan, the fuel injection frequency of the fuel injection pump, and the resistance value of the ignition plug in step S103 includes: and adjusting the rotating speed of a motor of the fan to change the air inlet amount in the combustion chamber, and/or adjusting the oil injection frequency of an oil injection pump to change the fuel oil inlet amount in the combustion chamber, so that the preset air-fuel ratio in the combustion chamber is achieved.

In the embodiment of the present application, when the fuel heater is in the first operation stage, a flow chart of a control method of the fuel heater is shown in fig. 3, and includes:

s201: receiving in-cylinder temperature information of a combustion chamber in the fuel heater, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotational speed information of a fan motor, current information of the fan motor, and resistance information of an ignition plug, and then executing step S202, step S203, step S204, and step S205.

S202: determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving the ratio of the first temperature difference to a preset time unit; determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference; when the ratio of the first temperature difference to the preset time unit exceeds the first reference ratio and the difference between the first temperature difference and the second temperature difference exceeds the first reference temperature value, it is determined that the relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet satisfies the preset temperature relationship condition, and then step S206 is executed.

It should be noted that the first reference ratio, the first reference temperature value and the preset time unit may be determined according to actual design requirements. For example, different models of fuel heaters use different first reference ratios, first reference temperature values, and preset time units.

In one embodiment of the present application, the in-cylinder temperature value is represented by T1, the out-of-cylinder temperature value is represented by T2, the outlet temperature value is represented by T3, and the difference between the first temperature difference and the second temperature difference is represented by Δ T. The first reference ratio is 2 ℃/100ms (2 degrees centigrade/100 milliseconds), and the first reference temperature value is 2 ℃ (2 degrees centigrade).

The relationship among the in-cylinder temperature value of the combustion chamber, the out-of-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet, which satisfies the preset temperature relationship condition, may be expressed as:

ΔT＝(T2-T1)/Δt，ΔT>2℃/100ms；

(T2-T1)-(T3-T2)>2℃。

s203: when the rotating speed value of the fan motor exceeds the first reference rotating speed value, it is determined that the rotating speed value of the fan motor meets the preset rotating speed condition, and then step S206 is executed.

It should be noted that the first reference rotational speed value may be determined according to actual design requirements. For example, different models of fuel heaters use different first reference speed values.

In one embodiment of the present application, the value of the rotational speed of the fan motor may be represented by N, and the first reference rotational speed value is 2500r/min (revolutions per minute). The rotation speed value of the fan motor satisfying the preset rotation speed condition may be expressed as: n is more than 2500 r/min.

S204: when the current value of the fan motor is in the first reference current range, it is determined that the current value of the fan motor satisfies the preset current condition, and then step S206 is performed.

It should be noted that the first reference current range may depend on actual design requirements. For example, different models of fuel heaters use different first reference current ranges.

In one embodiment of the present application, the current value of the fan motor may be represented by I, and the first reference current range is 0.125mA (milliamp) to 3A (amp). The current value of the fan motor satisfying the preset current condition may be expressed as: 0.125mA < I < 3A.

S205: when the resistance value of the ignition plug is within the first reference resistance value range and continuously maintains the preset duration, it is determined that the resistance value of the ignition plug satisfies the preset resistance condition, and then step S206 is executed.

It should be noted that the first reference resistance value range and the preset time period may be determined according to actual design requirements. For example, different fuel heaters may employ different first reference resistance ranges and preset durations.

In one embodiment of the present application, the resistance value of the ignition plug may be represented by R, the first reference resistance value range may be 1.25k Ω (kilo-ohm) to 1.95k Ω (kilo-ohm), and the preset time period may be a sum of 10 minimum operation periods (50 msec) of the controller. The resistance value of the ignition plug satisfying the preset resistance condition may be expressed as: 1.25k Ω < ═ R < ═ 1.95k Ω, and was held for 50 milliseconds.

S206: and when the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition, the rotating speed value of the fan motor meets a preset rotating speed condition, the current value of the fan motor meets a preset current condition, and the resistance value of the ignition plug meets a preset resistance condition, judging that the fire accident happens to the fuel heater.

S207: and adjusting the rotating speed of a motor of the fan to change the air inlet amount in the combustion chamber, and/or adjusting the oil injection frequency of an oil injection pump to change the fuel oil inlet amount in the combustion chamber, so that the preset air-fuel ratio in the combustion chamber is achieved, and the fuel oil heater is recovered to be in an ignition state.

It should be noted that the preset air-fuel ratio, which is usually the optimum air-fuel ratio of the fuel heater, may be based on actual design requirements.

In this embodiment of the present application, when the fuel oil heater is in the second working phase, it is determined in step S102 that the relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet satisfies the preset temperature relationship condition, which includes:

determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving the ratio of the first temperature difference to a preset time unit;

determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference;

and when the ratio of the first temperature difference to the preset time unit exceeds a second reference ratio and the difference value of the first temperature difference and the second temperature difference exceeds a second reference temperature value, determining that the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition.

Alternatively, the in-cylinder temperature value of the combustion chamber may be a temperature of an inner wall of the combustion chamber, and the out-of-cylinder temperature value of the combustion chamber may be a temperature of an outer wall of the combustion chamber.

In the embodiment of the present application, when the fuel oil heater is in the second operation stage, the step S102 determines that the rotation speed value of the fan motor meets the preset rotation speed condition, which includes: when the rotating speed value of the fan motor exceeds the second reference rotating speed value, determining that the rotating speed value of the fan motor meets a preset rotating speed condition;

determining that the current value of the fan motor meets the preset current condition in step S102 includes: and when the current value of the fan motor is in the second reference current range, determining that the current value of the fan motor meets the preset current condition.

In the embodiment of the present application, when the fuel heater is in the second operation stage, the determining in step S102 that the resistance value of the ignition plug satisfies the preset resistance condition includes: and when the resistance value of the ignition plug is in the second reference resistance value range and continuously keeps the preset duration, determining that the resistance value of the ignition plug meets the preset resistance condition.

In the embodiment of the present application, when the fuel heater is in the second operation stage, adjusting at least one of the motor speed of the fan, the fuel injection frequency of the fuel injection pump, and the resistance value of the ignition plug in step S103 includes: the correction control coefficient of the resistance value of the ignition plug is adjusted so that the resistance value of the ignition plug is maintained within the target resistance value range.

In the embodiment of the present application, when the fuel heater is in the second operation stage, a flowchart of a control method of the fuel heater is shown in fig. 4, and includes:

s301: the in-cylinder temperature information of the combustion chamber in the fuel heater, the out-cylinder temperature information of the combustion chamber, the temperature information of the liquid outlet, the rotational speed information of the fan motor, the current information of the fan motor, and the resistance information of the ignition plug are received, and then step S302, step S303, step S304, and step S305 are executed.

S302: determining a first temperature difference according to the out-of-cylinder temperature value and the in-cylinder temperature value, and solving the ratio of the first temperature difference to a preset time unit; determining a second temperature difference according to the temperature value of the liquid outlet and the temperature value outside the cylinder, and solving a difference value between the first temperature difference and the second temperature difference; when the ratio of the first temperature difference to the preset time unit exceeds the second reference ratio and the difference between the first temperature difference and the second temperature difference exceeds the second reference temperature value, it is determined that the relationship among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet satisfies the preset temperature relationship condition, and then step S306 is executed.

It should be noted that the second reference ratio, the second reference temperature value and the preset time unit may be determined according to actual design requirements. For example, different models of fuel heaters use different second reference ratios, second reference temperature values, and preset time units.

In one embodiment of the present application, the in-cylinder temperature value is represented by T1, the out-of-cylinder temperature value is represented by T2, the outlet temperature value is represented by T3, and the difference between the first temperature difference and the second temperature difference is represented by Δ T. The second reference ratio is 4 ℃/100ms (4 degrees centigrade/100 milliseconds), and the second reference temperature value is 4 ℃ (4 degrees centigrade).

The relationship among the in-cylinder temperature value of the combustion chamber, the out-of-cylinder temperature value of the combustion chamber, and the temperature value of the liquid outlet, which satisfies the preset temperature relationship condition, may be expressed as:

ΔT＝(T2-T1)/Δt，ΔT>4℃/100ms；

(T2-T1)-(T3-T2)>4℃。

s303: when the rotating speed value of the fan motor exceeds the second reference rotating speed value, it is determined that the rotating speed value of the fan motor meets the preset rotating speed condition, and then step S306 is executed.

It should be noted that the second reference rotational speed value may be determined according to actual design requirements. For example, different models of fuel heaters use different second reference speed values.

In one embodiment of the present application, the value of the speed of the fan motor may be represented by N, and the second reference speed value is 9500r/min (revolutions per minute). The rotation speed value of the fan motor satisfying the preset rotation speed condition may be expressed as: n is more than 9500 r/min.

S304: when the current value of the fan motor is in the second reference current range, it is determined that the current value of the fan motor satisfies the preset current condition, and then step S306 is performed. .

It should be noted that the second reference current range may be determined according to actual design requirements. For example, different models of fuel heaters use different second reference current ranges.

In one embodiment of the present application, the current value of the fan motor may be represented by I, and the second reference current range is more than 3A (amperes). The current value of the fan motor satisfying the preset current condition may be expressed as: i > 3A.

S305: when the resistance value of the ignition plug is within the second reference resistance value range and continuously maintains the preset duration, it is determined that the resistance value of the ignition plug meets the preset resistance condition, and then step S306 is executed.

It should be noted that the second reference resistance value range and the preset time period may be determined according to actual design requirements. For example, different fuel heaters may employ different second reference resistance ranges and preset durations.

In one embodiment of the present application, the resistance value of the ignition plug may be represented by R, the second reference resistance value range is 0.65k Ω (kilo-ohm) to 1.35k Ω (kilo-ohm), and the preset time period may be a sum of 10 minimum operation periods (50 msec) of the controller. The resistance value of the ignition plug satisfying the preset resistance condition may be expressed as: 0.65k Ω < ═ R < ═ 1.35k Ω, and was held for 50 milliseconds.

S306: and when the relation among the in-cylinder temperature value of the combustion chamber, the out-cylinder temperature value of the combustion chamber and the temperature value of the liquid outlet meets a preset temperature relation condition, the rotating speed value of the fan motor meets a preset rotating speed condition, the current value of the fan motor meets a preset current condition, and the resistance value of the ignition plug meets a preset resistance condition, judging that the fire accident happens to the fuel heater.

S307: the correction control coefficient of the resistance value of the ignition plug is adjusted so that the resistance value of the ignition plug is maintained within the target resistance value range.

Alternatively, the resistance of the ignition plug should change according to a predetermined resistance curve, which is generally non-linear. And adjusting the correction control coefficient for adjusting the resistance value of the ignition plug so as to enable the resistance value of the ignition plug to cross a preset resistance curve.

Based on the same inventive concept, the embodiment of the present application further provides a control system 400 of the fuel oil heater, as shown in fig. 5, the control system includes a first temperature sensor 1, a second temperature sensor 2, a third temperature sensor 3, a first detection module 4, a second detection module 5, and a controller 6.

The first temperature sensor 1 is provided inside a combustion chamber of the fuel heater, and detects in-cylinder temperature information of the combustion chamber. Alternatively, the first temperature sensor 1 may be provided on an inner wall of the combustion chamber, detecting the temperature of the inner wall of the combustion chamber. The first temperature sensor needs to have good high temperature resistance.

The second temperature sensor 2 is provided outside the combustion chamber of the fuel heater and detects the temperature information outside the combustion chamber. Alternatively, the second temperature sensor 2 may be provided on the outer wall of the combustion chamber, detecting the temperature of the outer wall of the combustion chamber. The second temperature sensor 2 is required to have a good corrosion resistance.

The third temperature sensor 3 is arranged at the liquid outlet of the fuel oil heater and used for detecting the temperature information of the liquid outlet.

The first detection module 4 is used for being electrically connected with a fan motor of the fuel heater and detecting the rotating speed information of the fan motor. Alternatively, the first detection module 4 may be a pulse width modulation module.

And the second detection module 5 is used for being electrically connected with an ignition plug of the fuel heater and detecting the resistance information of the ignition plug. The second detection module 5 can obtain the resistance of the ignition plug by conversion according to the voltage value according to the relation between the voltage and the resistance of the circuit where the ignition plug is located.

The controller 6 is respectively connected with the first temperature sensor 1, the second temperature sensor 2, the third temperature sensor 3, the first detection module 4, the second detection module 5, the fan motor and the ignition plug; the controller 6 is used for executing the control method of the fuel heater provided by each of the above embodiments of the present application.

Based on the same inventive concept, the embodiment of the present application further provides a motor vehicle comprising: a fuel heater, a battery pack, and a control system 400 for a fuel heater provided in the above embodiments of the present application.

The first temperature sensor 1 of the control system 400 of the fuel heater is disposed inside the combustion chamber of the fuel heater.

The second temperature sensor 2 of the control system 400 of the fuel heater is disposed outside the combustion chamber of the fuel heater.

The third temperature sensor 3 of the control system 400 of the fuel heater is arranged at the liquid outlet of the fuel heater.

The first detection module 4 of the control system 400 of the fuel heater is electrically connected with the fan motor of the fuel heater.

The second detection module 5 of the control system 400 of the fuel heater is electrically connected with the ignition plug of the fuel heater.

The controller 6 of the fuel heater control system 400 is connected to the fan motor and the ignition plug, respectively.

The liquid outlet of the fuel oil heater is communicated with the liquid inlet of the battery pack, and the liquid inlet of the fuel oil heater is communicated with the liquid outlet of the battery pack.

Optionally, the fuel heater is provided with a liquid path system, when the fuel in the combustion chamber is combusted, liquid (such as water) in the liquid path system can be heated, and the heated liquid can flow into and out of the liquid path system of the battery pack through a liquid outlet of the liquid path system of the fuel heater to heat the battery pack; after the liquid in the liquid path system of the battery pack is cooled, the liquid flows back to the liquid path system of the fuel heater through the liquid inlet of the fuel heater.

Optionally, the motor vehicle provided by the embodiment of the application is an electric vehicle, and when the fuel heater is controlled by using the control method of the fuel heater provided by the embodiment of the application, the adverse effect of the fire problem on the fuel heater can be greatly reduced, so that the efficient use of the fuel heater is ensured. The battery pack of the motor vehicle can be heated quickly in the extreme cold weather, and the quick response of the motor vehicle in the extreme cold weather is realized. Of course, the fuel oil heater can also replace the battery pack to supply heat for other systems (such as an air conditioning system) of the motor vehicle, so that the energy loss of the battery pack is reduced, and the motor vehicle can reach higher endurance mileage.

The motor vehicle provided by the embodiment of the present application has the same inventive concept and the same beneficial effects as the embodiments described above, and the details that are not shown in detail in the motor vehicle can refer to the embodiments described above, and are not described again here.

Based on the same inventive concept, embodiments of the present application further provide a computer-readable storage medium, which stores a computer program, and when the computer program is executed by the control system 400 of the fuel heater, the control method of the fuel heater provided by the above embodiments of the present application is implemented.

The computer readable medium includes, but is not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks, ROMs, RAMs, EPROMs (Erasable Programmable Read-Only Memory), EEPROMs, flash Memory, magnetic cards, or fiber optic cards. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).

The computer-readable storage medium provided in the embodiments of the present application has the same inventive concept and the same advantages as the embodiments described above, and contents not shown in detail in the computer-readable storage medium may refer to the embodiments described above, and are not described herein again.

By applying the embodiment of the application, at least the following beneficial effects can be realized:

in the embodiment of the present application, whether the fuel heater catches fire or not is accurately diagnosed in time by using a plurality of items of state information in the fuel heater (such as in-cylinder temperature information of a combustion chamber, out-cylinder temperature information of the combustion chamber, temperature information of a liquid outlet, rotational speed information of a fan motor, current information of the fan motor, and resistance information of an ignition plug). The control method of the fuel oil heater can greatly reduce the adverse effect of the fire problem on the fuel oil heater, and is beneficial to ensuring the efficient use of the fuel oil heater.

Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.

In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.