阅读说明：本技术 一种发动机起动扭矩确定方法及相关设备 (Engine starting torque determination method and related equipment ) 是由 陈月春 李素婷 于 2021-08-25 设计创作，主要内容包括：本公开提供的一种发动机起动扭矩确定方法及相关设备,可以获得发动机在当前时刻的当前转速和当前冷却液温度；根据当前转速和当前冷却液温度,在预先标定的摩擦阻力矩MAP中确定发动机在当前时刻的摩擦阻力矩；根据当前转速,在预先标定的角加速度曲线CUR中确定发动机在当前时刻的起动角加速度,其中,角加速度曲线用于指示发动机的转速与角加速度之间的对应关系；根据起动角加速度以及发动机的转动惯量,确定发动机在当前时刻的惯性阻力矩；根据摩擦阻力矩和惯性阻力矩,确定发动机在当前时刻所需的起动扭矩。本公开通过摩擦阻力矩和惯性阻力矩确定发动机在当前时刻所需的起动扭矩,使得确定出的起动扭矩更加准确,保证发动机的稳定起步。(The present disclosure provides an engine starting torque determination method and related apparatus, which can obtain a current rotation speed and a current coolant temperature of an engine at a current time; determining the friction resisting moment of the engine at the current moment in a pre-calibrated friction resisting moment MAP according to the current rotating speed and the current coolant temperature; determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine; determining the inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine; and determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment. The starting torque required by the engine at the current moment is determined through the friction resistance moment and the inertia resistance moment, so that the determined starting torque is more accurate, and the stable starting of the engine is ensured.)

1. An engine starting torque determination method, characterized by comprising:

obtaining the current rotating speed of the engine at the current moment and the current temperature of the cooling liquid;

determining the friction resistance torque of the engine at the current moment in a pre-calibrated friction resistance torque MAP according to the current rotating speed and the current coolant temperature;

determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine;

determining inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine;

and determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment.

2. The method of claim 1, wherein after said determining a starting torque required by said engine at said current time based on said frictional resistance torque and said inertial resistance torque, said method further comprises:

and converting the starting torque into an oil injection quantity, and controlling the engine to perform oil injection operation according to the oil injection quantity in the starting process.

3. The method of claim 1, wherein the determining the moment of inertia comprises:

controlling the engine to increase from a first rotating speed to a second rotating speed within a preset time period, and recording a first incidence relation between the rotating speed and the torque of the engine at any moment within the preset time period;

controlling the engine to be reduced from the second rotating speed to the first rotating speed within the preset time period, and recording a second incidence relation between the rotating speed and the torque of the engine at any moment within the preset time period;

determining a first target rotating speed according to the first rotating speed and the second rotating speed;

determining a first target torque associated with the first target rotating speed according to the first association relation;

determining a second target torque associated with the first target rotating speed according to the second association relation;

and determining the rotational inertia of the engine according to the preset time length, the first rotating speed, the second rotating speed, the first target torque and the second target torque.

4. The method according to claim 1, characterized in that the calibration procedure of the angular acceleration curve CUR comprises:

determining at least one rotating speed interval in a rotating speed range of the starting process of the engine according to a preset rotating speed interval;

for any of the speed intervals: determining a target angular acceleration corresponding to the rotating speed interval according to an interval starting rotating speed, an interval ending rotating speed and a target time length corresponding to the rotating speed interval, wherein any rotating speed in the rotating speed interval corresponds to the target angular acceleration, and the target time length is the time length from the interval starting rotating speed to the interval ending rotating speed of the engine;

and establishing the angular acceleration curve CUR according to the target angular acceleration corresponding to each rotating speed interval.

5. The method of claim 1, wherein said determining a resistive moment of inertia of said engine at said current time based on said starting angular acceleration and a rotational inertia of said engine comprises:

according to the formula:

T_rqa＝I×α

determining a resistive moment of inertia of the engine at the current time, wherein T_rqaThe inertial resistance moment, I is the rotational inertia of the engine, and α is the starting angular acceleration.

6. The method of claim 3, wherein determining a first target rotational speed based on the first rotational speed and the second rotational speed comprises:

according to the formula:

determining a first target speed, wherein n_gIs the first target rotational speed, n₁At the first speed and n₂The second rotation speed.

7. The method of claim 3, wherein said determining a rotational inertia of the engine based on the preset duration, the first speed, the second speed, the first target torque, and the second target torque comprises:

according to the formula:

determining the rotational inertia of the engine, wherein I is the rotational inertia of the engine, t is the preset time length, n₁Is the first rotational speed, n₂At said second rotational speed, T_rq1Is the first target torque, T_rq2Is the second target torque and pi is the circumferential ratio.

8. An engine starting torque determining apparatus, characterized by comprising: an engine data obtaining unit, a frictional resistance torque determining unit, a starting angular acceleration determining unit, an inertial resistance torque determining unit, and a starting torque determining unit,

the engine data obtaining unit is used for obtaining the current rotating speed of the engine at the current moment and the current coolant temperature;

the friction resistance torque determining unit is used for determining the friction resistance torque of the engine at the current moment in a friction resistance torque MAP calibrated in advance according to the current rotating speed and the current coolant temperature;

the starting angular acceleration determining unit is used for determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine;

the inertial resistance moment determining unit is used for determining the inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine;

and the starting torque determining unit is used for determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment.

9. A computer-readable storage medium on which a program is stored, the program, when executed by a processor, implementing an engine starting torque determination method according to any one of claims 1 to 7.

10. An electronic device comprising at least one processor, and at least one memory connected to the processor, a bus; the processor and the memory complete mutual communication through the bus; the processor is configured to invoke program instructions in the memory to perform the engine cranking torque determination method as defined in any of claims 1 to 7.

Technical Field

The disclosure relates to the technical field of engines, and in particular relates to an engine starting torque determination method and related equipment.

Background

When the starting control is carried out on the current diesel engine, the starting torque needs to be estimated, the ECU converts the estimated starting torque into the corresponding fuel injection quantity, and the diesel engine is started in a direct fuel injection mode.

If the starting torque estimation is too large, the problem of over-regulation of the rotating speed is easily caused by insufficient combustion in a cylinder in the starting process of the diesel engine. If the starting torque estimate is too small, misfire failure of the engine is likely to occur, resulting in a failed start.

Therefore, how to accurately determine the starting torque of the engine becomes a technical problem which needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above problems, the present disclosure provides an engine starting torque determining method and related apparatus that overcome or at least partially solve the above problems, the technical solutions are as follows:

an engine cranking torque determination method comprising:

obtaining the current rotating speed of the engine at the current moment and the current temperature of the cooling liquid;

determining the friction resistance torque of the engine at the current moment in a pre-calibrated friction resistance torque MAP according to the current rotating speed and the current coolant temperature;

determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine;

determining inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine;

and determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment.

Optionally, after determining the required starting torque of the engine at the current time according to the frictional resistance torque and the inertial resistance torque, the method further comprises:

and converting the starting torque into an oil injection quantity, and controlling the engine to perform oil injection operation according to the oil injection quantity in the starting process.

Optionally, the determining process of the rotational inertia includes:

controlling the engine to increase from a first rotating speed to a second rotating speed within a preset time period, and recording a first incidence relation between the rotating speed and the torque of the engine at any moment within the preset time period;

controlling the engine to be reduced from the second rotating speed to the first rotating speed within the preset time period, and recording a second incidence relation between the rotating speed and the torque of the engine at any moment within the preset time period;

determining a first target rotating speed according to the first rotating speed and the second rotating speed;

determining a first target torque associated with the first target rotating speed according to the first association relation;

determining a second target torque associated with the first target rotating speed according to the second association relation;

and determining the rotational inertia of the engine according to the preset time length, the first rotating speed, the second rotating speed, the first target torque and the second target torque.

Optionally, the calibration process of the angular acceleration curve CUR includes:

determining at least one rotating speed interval in a rotating speed range of the starting process of the engine according to a preset rotating speed interval;

for any of the speed intervals: determining a target angular acceleration corresponding to the rotating speed interval according to an interval starting rotating speed, an interval ending rotating speed and a target time length corresponding to the rotating speed interval, wherein any rotating speed in the rotating speed interval corresponds to the target angular acceleration, and the target time length is the time length from the interval starting rotating speed to the interval ending rotating speed of the engine;

and establishing the angular acceleration curve CUR according to the target angular acceleration corresponding to each rotating speed interval.

Optionally, the determining the inertial resistance moment of the engine at the current time according to the starting angular acceleration and the rotational inertia of the engine includes:

according to the formula:

T_rqa＝I×α

determining a resistive moment of inertia of the engine at the current time, wherein T_rqaThe inertial resistance moment, I is the rotational inertia of the engine, and α is the starting angular acceleration.

Optionally, the determining a first target rotation speed according to the first rotation speed and the second rotation speed includes:

according to the formula:

determining a first target speed, wherein n_gIs the first target rotational speed, n₁At the first speed and n₂The second rotation speed.

Optionally, the determining the rotational inertia of the engine according to the preset time period, the first rotation speed, the second rotation speed, the first target torque, and the second target torque includes:

according to the formula:

determining the rotational inertia of the engine, wherein I is the rotational inertia of the engine, t is the preset time length, n₁Is the first rotational speed, n₂At said second rotational speed, T_rq1Is the first target torque, T_rq2Is the second target torque and pi is the circumferential ratio.

An engine starting torque determining apparatus comprising: an engine data obtaining unit, a frictional resistance torque determining unit, a starting angular acceleration determining unit, an inertial resistance torque determining unit, and a starting torque determining unit,

the engine data obtaining unit is used for obtaining the current rotating speed of the engine at the current moment and the current coolant temperature;

the friction resistance torque determining unit is used for determining the friction resistance torque of the engine at the current moment in a friction resistance torque MAP calibrated in advance according to the current rotating speed and the current coolant temperature;

the starting angular acceleration determining unit is used for determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine;

the inertial resistance moment determining unit is used for determining the inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine;

and the starting torque determining unit is used for determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment.

A computer-readable storage medium, having stored thereon a program which, when executed by a processor, implements an engine starting torque determination method as in any one of the above.

An electronic device comprising at least one processor, and at least one memory connected to the processor, a bus; the processor and the memory complete mutual communication through the bus; the processor is configured to invoke program instructions in the memory to perform the engine cranking torque determination method as defined in any of the above.

By means of the technical scheme, the engine starting torque determining method and the related equipment can obtain the current rotating speed and the current coolant temperature of the engine at the current moment; determining the friction resisting moment of the engine at the current moment in a pre-calibrated friction resisting moment MAP according to the current rotating speed and the current coolant temperature; determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine; determining the inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine; and determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment. The starting torque required by the engine at the current moment is determined through the friction resistance moment and the inertia resistance moment, so that the determined starting torque is more accurate, and the stable starting of the engine is ensured.

The foregoing description is only an overview of the technical solutions of the present disclosure, and the embodiments of the present disclosure are described below in order to make the technical means of the present disclosure more clearly understood and to make the above and other objects, features, and advantages of the present disclosure more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the disclosure. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 illustrates a schematic diagram of one implementation of an engine cranking torque determination method provided by an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating a calibration process of an angular acceleration curve CUR provided by the embodiment of the disclosure;

fig. 3 is a schematic diagram illustrating a process for determining the moment of inertia according to an embodiment of the present disclosure;

FIG. 4 illustrates a startup torque calculation logic diagram for the engine startup torque determination method provided by the disclosed embodiments;

FIG. 5 is a schematic diagram illustrating another embodiment of a method for determining engine cranking torque provided by an embodiment of the present disclosure;

fig. 6 shows a schematic structural diagram of an engine starting torque determination device provided by an embodiment of the disclosure.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1, a schematic diagram of an implementation manner of an engine starting torque determination method provided by an embodiment of the present disclosure may include:

s100, obtaining the current rotating speed of the engine at the current moment and the current temperature of the cooling liquid.

Specifically, the disclosed embodiment can obtain the current rotating speed of the engine and the current coolant temperature during the starting process of the engine. It can be understood that the coolant is a liquid which circulates in the engine water tank to achieve the effects of freezing prevention, boiling prevention, rust prevention, corrosion prevention and the like.

And S200, determining the friction resistance torque of the engine at the current moment in a pre-calibrated friction resistance torque MAP according to the current rotating speed and the current coolant temperature.

During the starting of the engine, it is necessary to overcome the frictional resistance torque of the engine in order to change from a stationary state to an operating state. The frictional drag torque may include an internal frictional drag torque of the engine and an accessory drag torque, among others. Because the friction resistance torque is mainly influenced by the rotating speed of the engine and the temperature of the cooling liquid, the embodiment of the disclosure can use the rack dynamometer to drag the engine to operate, and record the torque measured by the dynamometer at different rotating speeds and at different temperatures of the cooling liquid, thereby completing the calibration of the friction resistance torque MAP. Therefore, the presently disclosed embodiment can determine the frictional resistance torque corresponding to the current rotation speed and the current coolant temperature in the frictional resistance torque MAP in the case where the current rotation speed and the current coolant temperature are obtained.

S300, according to the current rotating speed, determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine.

During the starting process of the engine, if the starting speed is reached to the starting success speed from the starting spraying speed, the inertia resistance moment generated by the acceleration of the engine needs to be overcome. According to the rigid body dead axle rotation law, the inertial resistance moment of the engine is related to the rotational inertia of the engine and the starting angular acceleration.

Optionally, as shown in fig. 2, the calibration process of the angular acceleration curve CUR provided by the embodiment of the present disclosure may include:

a100, according to a preset rotating speed interval, at least one rotating speed interval is determined in a rotating speed range in the starting process of the engine.

Wherein, the preset rotating speed interval can be set according to the actual situation. For example: the preset rotation speed interval may be 1rpm or 50 rpm. Specifically, assuming that the preset rotation speed interval is 50rpm, the rotation speed range of the engine during the starting process is 0rpm to 899pm, the rotation speed interval is from 0rpm to 49rpm, the rotation speed interval is from 50rpm to 99rpm, and so on.

It is understood that the starting process of the engine includes a pre-actuation phase, a starting phase, and a steady operation phase.

A200, for any rotating speed interval: and determining a target angular acceleration corresponding to the rotating speed interval according to the interval starting rotating speed, the interval ending rotating speed and the target duration corresponding to the rotating speed interval, wherein any rotating speed in the rotating speed interval corresponds to the target angular acceleration.

Wherein the target duration is a duration taken by the engine from the interval starting rotational speed to the interval ending rotational speed.

The disclosed embodiment can be implemented by the following formula:

and determining a target angular acceleration corresponding to the rotating speed interval, wherein,for a target angular acceleration, n, corresponding to a rotation speed interval_sIs the interval starting speed of the speed interval, n_eThe interval end rotating speed of the rotating speed interval is pi is a circumferential rate, and Δ t is a target duration corresponding to the rotating speed interval, wherein the Δ t is t_e-t_sWherein, t_sAt a time corresponding to the interval starting rotation speed, t_eThe time corresponding to the interval end rotating speed.

And A300, establishing an angular acceleration curve CUR according to the target angular acceleration corresponding to each rotating speed interval.

It is understood that, after the target angular acceleration of the engine corresponding to each rotating speed interval is obtained, the disclosed embodiment may establish an angular acceleration curve CUR of the rotating speed corresponding to the target angular acceleration. In actual use, according to the current rotating speed of the engine, the angular acceleration corresponding to the rotating speed interval in which the current rotating speed is located is determined as the starting angular acceleration in the angular acceleration curve CUR. According to the embodiment of the disclosure, the starting angular acceleration is determined through the pre-calibrated angular acceleration curve CUR, so that the starting angular acceleration corresponding to the current rotating speed can be quickly and accurately determined, the calculation time of the inertial resistance moment of the engine is shortened, and the calculated inertial resistance moment of the engine is ensured to be accurate and effective.

And S400, determining the inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine.

The rotational inertia of the engine can be calibrated in advance.

Alternatively, the disclosed embodiment may determine the product of the starting angular acceleration and the rotational inertia of the engine as the inertial resistance moment of the engine at the present time. Step S400 may specifically include:

according to the formula:

T_rqa＝I×α

determining the moment of inertia of the engine at the present time, wherein T_rqaIs the moment of inertia resistance, I is the moment of inertia of the engine, and α is the starting angular acceleration.

Alternatively, the disclosed embodiment may determine the rotational inertia of the engine by dragging the engine with a dynamometer. Optionally, as shown in fig. 3, the determining process of the moment of inertia provided by the embodiment of the present disclosure may include:

b100, controlling the engine to increase from the first rotating speed to the second rotating speed within a preset time period, and recording a first correlation relation between the rotating speed and the torque of the engine at any moment within the preset time period.

Specifically, the embodiment of the disclosure may set the pedal opening to 0, drive the engine with the dynamometer, increase the rotation speed of the engine from the first rotation speed to the second rotation speed within a preset time period, continuously record the rotation speed value and the torque value of the engine within the preset time period, and establish the first association relationship between the rotation speed value and the torque value at the same time.

And B200, controlling the engine to be reduced from the second rotating speed to the first rotating speed within a preset time period, and recording a second incidence relation between the rotating speed and the torque of the engine at any moment within the preset time period.

Specifically, the embodiment of the disclosure may set the pedal opening to 0, drag the engine with the dynamometer to run, reduce the rotation speed of the engine from the second rotation speed to the first rotation speed within a preset time period, continuously record the rotation speed value and the torque value of the engine within the preset time period, and establish the second association relationship between the rotation speed value and the torque value at the same time.

And B300, determining a first target rotating speed according to the first rotating speed and the second rotating speed.

Alternatively, the embodiment of the present disclosure may determine an average value of the first rotation speed and the second rotation speed as the first target rotation speed. Step B300 may specifically include:

according to the formula:

determining a first target speed, wherein n_gIs a first target rotation speed, n₁Is a first speed and n₂The second rotation speed.

And B400, determining a first target torque associated with the first target rotating speed according to the first association relation.

And B500, determining a second target torque associated with the first target rotating speed according to the second association relation.

And B600, determining the rotational inertia of the engine according to the preset time length, the first rotating speed, the second rotating speed, the first target torque and the second target torque.

Optionally, step B600 may include:

according to the formula:

determining the rotational inertia of the engine, wherein I is the rotational inertia of the engine, t is a preset time length, and n₁Is a first rotation speed, n₂At a second rotational speed, T_rq1Is a first target torque, T_rq2Is the second target torque and pi is the circumferential ratio.

And S500, determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment.

Alternatively, the disclosed embodiment may determine the sum of the frictional resistance torque and the inertial resistance torque as the starting torque required by the engine at the present time. FIG. 4 is a schematic diagram illustrating a starting torque calculation logic of the engine starting torque determination method according to the embodiment of the disclosure.

According to the engine starting torque determining method, the current rotating speed and the current coolant temperature of the engine at the current moment can be obtained; determining the friction resisting moment of the engine at the current moment in a pre-calibrated friction resisting moment MAP according to the current rotating speed and the current coolant temperature; determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine; determining the inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine; and determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment. The starting torque required by the engine at the current moment is determined through the friction resistance moment and the inertia resistance moment, so that the determined starting torque is more accurate, and the stable starting of the engine is ensured.

Alternatively, based on the method shown in fig. 1, as shown in fig. 5, another implementation of the engine starting torque determination method provided by the embodiment of the present disclosure is schematically illustrated, after step S500, the engine starting torque determination method may further include:

s600, converting the starting torque into an oil injection quantity, and controlling the engine to perform oil injection operation according to the oil injection quantity in the starting process.

According to the embodiment of the disclosure, the ECU can convert the starting torque into the fuel injection quantity, and the engine is controlled to directly inject fuel according to the fuel injection quantity in the starting process, so that the engine is started.

Under low-temperature environment, due to the fact that the ignition lag period of the engine is prolonged, the engine is prone to in-cylinder misfire or incomplete combustion, and high Hydrocarbon (HC) emission is prone to being generated. If the fuel injection quantity is too high, the phenomenon of wall wetting in the cylinder is easily caused due to poor diesel atomization performance at low temperature, the engine is not started easily, and the fuel consumption is too high. If the fuel injection quantity is too small, the concentration of combustible mixture in a cylinder is easy to be insufficient, the rotating speed is caused to intermittently shift, the emission of hydrocarbon and Particulate Matters (PM) is increased, and therefore the starting of an engine is not facilitated. According to the embodiment of the invention, the fuel injection quantity of the engine in the low-temperature environment can be reasonably determined by converting the starting torque determined by the friction resistance moment and the inertia resistance moment into the fuel injection quantity, so that the engine can inject fuel reasonably in the starting process, and the high reliability of the engine in the low-temperature environment is ensured.

Although the operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous.

It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.

In accordance with the above method embodiment, an engine starting torque determining apparatus provided by the embodiment of the present disclosure is configured as shown in fig. 6, and includes: engine data obtaining unit 100, frictional resistance torque determination unit 200, starting angular acceleration determination unit 300, inertial resistance torque determination unit 400, and starting torque determination unit 500.

An engine data obtaining unit 100 for obtaining a current rotation speed of the engine at a current time and a current coolant temperature.

A frictional resistance torque determination unit 200 for determining a frictional resistance torque of the engine at the present time in a previously calibrated frictional resistance torque MAP according to the present rotation speed and the present coolant temperature.

A starting angular acceleration determining unit 300, configured to determine a starting angular acceleration of the engine at the current time in a pre-calibrated angular acceleration curve CUR according to the current rotation speed, where the angular acceleration curve is used to indicate a corresponding relationship between the rotation speed and the angular acceleration of the engine.

Optionally, the engine starting torque determining means may further include: the calibration unit of the angular acceleration curve CUR is used for calibrating the angular acceleration curve CUR. The angular acceleration curve CUR calibration unit comprises: the device comprises a rotating speed interval determining subunit, a target angular acceleration determining subunit and an angular acceleration curve CUR establishing subunit.

And the rotating speed interval determining subunit is used for determining at least one rotating speed interval in the rotating speed range of the starting process of the engine according to the preset rotating speed interval.

A target angular acceleration determination subunit configured to, for any one of the rotation speed intervals: and determining a target angular acceleration corresponding to the rotating speed interval according to the interval starting rotating speed, the interval ending rotating speed and the target time length corresponding to the rotating speed interval, wherein any rotating speed in the rotating speed interval corresponds to the target angular acceleration, and the target time length is the time length from the interval starting rotating speed to the interval ending rotating speed of the engine.

And the angular acceleration curve CUR establishing subunit is used for establishing an angular acceleration curve CUR according to the target angular acceleration corresponding to each rotating speed interval.

The inertial resistance moment determination unit 400 is configured to determine an inertial resistance moment of the engine at the current time according to the starting angular acceleration and the rotational inertia of the engine.

Optionally, the inertial resistance moment determining unit 400 is specifically configured to:

T_rqa＝I×α

determining the moment of inertia of the engine at the present time, wherein T_rqaIs the moment of inertia resistance, I is the moment of inertia of the engine, and α is the starting angular acceleration.

Optionally, the engine starting torque determination apparatus may further include a rotational inertia determination unit for determining a rotational inertia. The rotational inertia determination unit includes: the device comprises a first incidence relation recording subunit, a second incidence relation recording subunit, a first target rotating speed determining subunit, a first target torque determining subunit, a second target torque determining subunit and a rotational inertia determining subunit.

And the first incidence relation recording subunit is used for controlling the engine to increase from the first rotating speed to the second rotating speed within a preset time period and recording a first incidence relation between the rotating speed and the torque of the engine at any moment within the preset time period.

And the second incidence relation recording subunit is used for controlling the engine to be reduced from the second rotating speed to the first rotating speed within the preset time period, and recording a second incidence relation between the rotating speed and the torque of the engine at any moment within the preset time period.

And the first target rotating speed determining subunit is used for determining the first target rotating speed according to the first rotating speed and the second rotating speed.

Optionally, the first target rotation speed determining subunit is specifically configured to:

determining a first target speed, wherein n_gIs a first target rotation speed, n₁Is a first speed and n₂The second rotation speed.

And the first target torque determining subunit is used for determining a first target torque associated with the first target rotating speed according to the first association relation.

And a second target torque determination subunit for determining a second target torque associated with the first target rotation speed according to the second association relationship.

And the rotational inertia determining subunit is used for determining the rotational inertia of the engine according to the preset time length, the first rotating speed, the second rotating speed, the first target torque and the second target torque.

Optionally, the rotational inertia determining subunit is specifically configured to:

determining the rotational inertia of the engine, wherein I is the rotational inertia of the engine, t is a preset time length, and n₁Is a first rotation speed, n₂At a second rotational speed, T_rq1Is a first target torque, T_rq2Is the second target torque and pi is the circumferential ratio.

And a starting torque determination unit 500 for determining a starting torque required by the engine at the present time based on the frictional resistance torque and the inertial resistance torque.

The present disclosure provides an engine starting torque determination apparatus that can obtain a current rotation speed and a current coolant temperature of an engine at a current time; determining the friction resisting moment of the engine at the current moment in a pre-calibrated friction resisting moment MAP according to the current rotating speed and the current coolant temperature; determining the starting angular acceleration of the engine at the current moment in a pre-calibrated angular acceleration curve CUR according to the current rotating speed, wherein the angular acceleration curve is used for indicating the corresponding relation between the rotating speed and the angular acceleration of the engine; determining the inertial resistance moment of the engine at the current moment according to the starting angular acceleration and the rotational inertia of the engine; and determining the starting torque required by the engine at the current moment according to the friction resistance moment and the inertia resistance moment. The starting torque required by the engine at the current moment is determined through the friction resistance moment and the inertia resistance moment, so that the determined starting torque is more accurate, and the stable starting of the engine is ensured.

Optionally, the engine starting torque determining means may further include: an oil injection operation control unit.

And the oil injection operation control unit is used for converting the starting torque into the oil injection quantity and controlling the engine to perform oil injection operation according to the oil injection quantity in the starting process.

According to the embodiment of the invention, the fuel injection quantity of the engine in the low-temperature environment can be reasonably determined by converting the starting torque determined by the friction resistance moment and the inertia resistance moment into the fuel injection quantity, so that the engine can inject fuel reasonably in the starting process, and the high reliability of the engine in the low-temperature environment is ensured.

With regard to the apparatus in the above-described embodiment, the specific manner in which each unit performs the operation has been described in detail in the embodiment related to the method, and will not be described in detail here.

The engine starting torque determining device comprises a processor and a memory, wherein the engine data obtaining unit 100, the frictional resistance torque determining unit 200, the starting angular acceleration determining unit 300, the inertial resistance torque determining unit 400, the starting torque determining unit 500 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to one or more than one, and the required starting torque of the engine at the current moment is determined by adjusting the kernel parameters through the friction resistance moment and the inertia resistance moment, so that the determined starting torque is more accurate, and the stable starting of the engine is ensured.

The disclosed embodiments provide a computer-readable storage medium having stored thereon a program that, when executed by a processor, implements the engine starting torque determination method.

The disclosed embodiments provide a processor for running a program, wherein the program runs to perform the engine cranking torque determination method.

The embodiment of the disclosure provides an electronic device, which comprises at least one processor, at least one memory connected with the processor, and a bus; the processor and the memory complete mutual communication through a bus; the processor is configured to invoke program instructions in the memory to perform the engine cranking torque determination method described above. The electronic device herein may be a server, a PC, a PAD, a mobile phone, etc.

The present disclosure also provides a computer program product adapted to perform a program, when executed on an electronic device, of initializing the steps of the engine starting torque determination method described above.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, electronic devices (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, an electronic device includes one or more processors (CPUs), memory, and a bus. The electronic device may also include input/output interfaces, network interfaces, and the like.

The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip. The memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.

The above are merely examples of the present disclosure, and are not intended to limit the present disclosure. Various modifications and variations of this disclosure will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the scope of the claims of the present disclosure.