Method for filling a cooling system of a vehicle with coolant
阅读说明：本技术 在车辆的冷却系统中加注冷却液的方法 (Method for filling a cooling system of a vehicle with coolant ) 是由 郑泰万 李孝祚 李勇珪 郑宇烈 于 2019-11-22 设计创作，主要内容包括：本发明涉及在车辆的冷却系统中加注冷却液的方法。该方法可以包括：确定车辆诊断装置连接,其确定配置为加注冷却液的诊断装置是否已经连接到车辆；通过诊断装置开始用于加注冷却液的冷却液加注模式；以及在开始冷却液加注模式之后,确定是否满足了冷却液加注模式解除条件。(The present invention relates to a method of filling a cooling system of a vehicle with coolant. The method can comprise the following steps: determining that a vehicle diagnostic device is connected, which determines whether a diagnostic device configured to charge coolant has been connected to the vehicle; initiating, by the diagnostic device, a coolant fill mode for filling coolant; and determining whether a coolant filling mode release condition is satisfied after the coolant filling mode is started.)
1. A method of filling a cooling system of a vehicle with coolant, the method comprising:
determining whether a diagnostic device configured to charge the coolant has been connected to the vehicle;
initiating, by the diagnostic device, a coolant fill mode for filling coolant in response to determining that the diagnostic device configured to fill coolant is connected to the vehicle;
after the coolant filling mode is started, it is determined by the diagnostic device whether a coolant filling mode release condition is satisfied.
2. The method of charging a cooling system of a vehicle with coolant according to claim 1,
in response to determining that the coolant charge mode has been entered, operation of the exhaust gas recirculation device is stopped.
3. The method of charging a cooling system of a vehicle with coolant according to claim 1,
in response to determining that the coolant fill mode has been entered, an alert is displayed on an instrument panel of the vehicle indicating that the coolant fill mode is in progress.
4. The method of charging a cooling system of a vehicle with coolant according to claim 1,
in the coolant charging mode, the diagnostic device is configured to apply a control signal to an engine control unit such that an engine of the vehicle is operated by alternately switching between a first operating mode for operating the engine at a predetermined first RPM for a first predetermined period of time and a second operating mode for operating the engine at a second RPM different from the first RPM for a second predetermined period of time.
5. The method of filling a cooling system of a vehicle with coolant as set forth in claim 1, further comprising:
determining whether the coolant temperature is equal to or greater than a predetermined first temperature;
wherein it is determined whether the coolant filling mode release condition is satisfied in response to the coolant temperature being equal to or greater than a predetermined first temperature.
6. The method of charging a cooling system of a vehicle with coolant according to claim 1,
the vehicle includes an electrical thermostat for opening and closing a cooling flow path of the cooling system;
in the coolant filling mode, the diagnostic device is configured to apply a control duty value for controlling a heat generation amount of a heater provided in the thermostat, thereby adjusting an opening/closing amount of the thermostat.
7. The method of charging a cooling system of a vehicle of claim 6, wherein,
in the coolant filling mode, the diagnostic device is configured to control the PWM duty signal applied to the heater such that a predetermined duty magnitude and an application time are alternately repeated, the signals being different from each other.
8. The method of filling a cooling system of a vehicle with coolant as set forth in claim 6, further comprising:
determining whether the coolant temperature is equal to or greater than a predetermined first temperature;
wherein the control duty cycle value is applied to the thermostat in response to the coolant temperature being equal to or greater than a predetermined first temperature.
9. The method of filling a cooling system of a vehicle with coolant as set forth in claim 4, further comprising:
determining whether the coolant temperature is equal to or greater than a predetermined first temperature;
wherein, in response to the coolant temperature being equal to or greater than a predetermined first temperature, the diagnostic device is configured to apply a control duty value for controlling a heat generation amount of a heater provided in an thermostat for opening and closing a cooling flow path of the cooling system, thereby adjusting an opening and closing amount of the thermostat.
10. The method of filling a cooling system of a vehicle with coolant according to claim 9,
in the coolant filling mode, the diagnostic device is configured to apply a control duty value to the thermostat and apply a control signal to the engine control unit such that the engine is operated by alternately switching between a third operating mode for operating the engine at a predetermined third RPM for a third predetermined period of time and a fourth operating mode for operating the engine at a fourth RPM different from the third RPM for a fourth predetermined period of time.
11. The method of filling a cooling system of a vehicle with coolant as set forth in claim 1, further comprising:
determining whether a coolant filling mode entry condition is satisfied;
wherein the coolant filling mode entry condition is determined to be satisfied when at least one of the following conditions is satisfied: when the engine of the vehicle is running, the transmission of the vehicle is in park shift and the vehicle speed is zero.
12. The method of charging a cooling system of a vehicle with coolant according to claim 1,
determining that a coolant fill mode release condition has been reached in response to at least one of the following conditions being met: the coolant temperature is equal to or greater than the second temperature, the coolant filling mode is selected to be ended by using the diagnostic device, the coolant filling mode entry condition is not satisfied, and the abnormality occurs to the electronic component.
13. A diagnostic device for filling coolant using the method of filling coolant of claim 1.
Technical Field
The present invention relates to a method of filling a cooling system of a vehicle with coolant, and more particularly, to a method of filling a cooling system of a vehicle with coolant by using a diagnostic device.
Background
Generally, a water-cooled cooling system that circulates coolant is applied to an engine of a vehicle for cooling the vehicle of the engine heated by combustion heat of fuel.
As shown in fig. 5A and 5B, when the coolant is initially injected, the coolant injected through the
However, this is a coolant injection path in an ideal case where, in the case of the cooling system shown in fig. 6A, the EGR
Further, since the air remaining in the cooling system cannot be completely discharged until the thermostat is opened due to the temperature rise of the coolant, an appropriate amount of the coolant cannot be injected.
When the injection of the coolant becomes insufficient due to the above-described problems, problems such as engine damage due to overheating of the engine, coolant flow noise generated at the early stage of cold start of the engine, breakage of the EGR cooler, poor heating of the heater, damage of the exhaust gas treatment device (SCR), and the like may occur.
Further, in order to solve these problems, the vehicle is in an idling state for a long time while the coolant is being filled, the coolant injection time becomes excessively long, and as shown in fig. 7, the coolant temperature cannot reach the temperature change of the thermostat one hour before the idling operation reaches, and therefore, there may be a case where the coolant is not sufficiently injected.
As such, when the engine is over-idling at a number of Revolutions Per Minute (RPM) equal to or greater than the idling speed to shorten the injection time, problems such as engine damage may occur during the above-described coolant injection operation.
Further, as described above, since the coolant filling operation is performed manually by the operator, deviation in coolant filling performance may occur according to skill invested in labor, and since the operator may continuously observe the filling state until the filling is completed, the labor cost of filling the coolant may be excessively high.
As shown in fig. 6A, the cooling system may include: a
Thus, it is necessary to perform refilling of the coolant when the cooling system portion of the vehicle is replaced. In this case, the conventional method for replenishing the coolant is performed by an operator performing the following procedure.
1) The antifreeze is filled through the radiator cover.
2) The engine of the vehicle is started and idling operation is performed until the coolant is circulated.
3) When the cooling fan is operated and the circulation of the cooling liquid is started, the cooling liquid is replenished through the radiator cover.
4) The air is sufficiently exhausted from the cooling device.
5) Repeating 2) to 4), and filling the cooling liquid to the preset liquid level of the liquid storage tank until the liquid level of the cooling liquid is not reduced any more.
6) After the engine is stopped, it is waited until the coolant is cooled.
The information contained in the background section of the invention is only intended to enhance an understanding of the general background of the invention and is not to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
While the ideal cooling system shown in fig. 5A and 5B applies a conventional method for replenishing the cooling liquid, various aspects of the present invention are directed to providing a cooling liquid injection path.
The present invention is directed to solving the problems, and an object of the present invention is to provide a method for replenishing coolant in a cooling system of a vehicle, which has improved ease of injection and reliability of injection when filling coolant. The present invention is not limited to the engine coolant circulation system shown in fig. 5A and 5B, but may be applied to a coolant circulation system in which some devices are deleted or added.
To achieve the object, according to an exemplary embodiment of the present invention, a method for filling coolant in a cooling system of a vehicle may include: determining that a vehicle diagnostic device is connected, which determines whether a diagnostic device configured to charge coolant has been connected to the vehicle; initiating, by the diagnostic device, a coolant fill mode for filling coolant; and determining whether a coolant filling mode release condition is satisfied after the coolant filling mode is started.
According to an exemplary embodiment of the present invention, the coolant filling operation may be automatically performed by the diagnosis device, unlike the conventional method for filling coolant that relies on manual operation by an operator.
When it is determined that the coolant filling mode has been entered, operation of an Exhaust Gas Recirculation (EGR) device is stopped.
According to the exemplary embodiments of the present invention, it is possible to prevent problems such as damage to an Exhaust Gas Recirculation (EGR) cooler due to the operation of an EGR device when filling coolant.
When it is determined that the coolant filling mode has been entered, an alert indicating that the coolant filling mode is in progress is displayed on an instrument panel of the vehicle.
According to the exemplary embodiments of the present invention, it is possible to allow an operator to easily recognize a coolant filling progress state, thereby improving operational convenience.
Preferably, in the above coolant charging mode, the diagnostic device is configured to apply a control signal to the ECU such that the engine of the vehicle is operated by alternately switching between a first operation mode for operating the engine at a predetermined first RPM for a first predetermined period of time and a second operation mode for operating the engine at a second RPM different from the first RPM for a second predetermined period of time.
According to an exemplary embodiment of the present invention, the engine may be operated in a predetermined operation mode to raise the coolant temperature to the thermostat change temperature. Further, the engines may be alternately operated in different operation modes from each other, thereby preventing the engines from overheating.
The method for filling coolant in a cooling system of a vehicle may further include: it is determined whether the coolant temperature is equal to or greater than a predetermined first temperature, and it is determined whether a coolant filling mode release condition is satisfied when the coolant temperature is equal to or greater than the predetermined first temperature.
The vehicle may include an electric thermostat for opening and closing a cooling flow path of the cooling system, and in the coolant filling mode, the diagnostic device is configured to apply a control duty value for controlling a heat generation amount of a heater provided in the electric thermostat, thereby adjusting an opening/closing amount of the electric thermostat.
According to an exemplary embodiment of the present invention, by using a diagnostic device in a vehicle to which an electric thermostat is applied, a heater provided in the electric thermostat may be controlled, thereby rapidly changing the electric thermostat.
Preferably, in the coolant filling mode, the diagnostic device is configured to control the PWM duty signal applied to the heater such that the predetermined duty magnitude and the application time are alternately repeated, which are different from each other.
According to an exemplary embodiment of the present invention, a high-output duty ratio may be applied, thereby preventing the heater from overheating and breaking.
The method for filling coolant in a cooling system of a vehicle may further include: it is determined whether the coolant temperature is equal to or greater than a predetermined first temperature, and the control duty value may be applied to the thermostat when the coolant temperature is equal to or greater than the predetermined first temperature.
When the coolant temperature is below a predetermined temperature, the changing temperature of the thermostat cannot be reached even if the heater of the thermostat is operated. Therefore, the present invention operates the heater when the temperature of the coolant is equal to or greater than the predetermined temperature, so that the heater is not operated meaningfully.
The vehicle may include an thermostat for opening and closing a cooling flow path of the cooling system, and the method for filling the cooling system of the vehicle with the coolant may further include: it is determined whether the coolant temperature is equal to or greater than a predetermined first temperature through the primary engine operation control, and when the coolant temperature is equal to or greater than the predetermined first temperature, the diagnostic device is configured to apply a control duty value for controlling the amount of heat generation of a heater provided in the thermostat, thereby adjusting the opening/closing amount of the thermostat.
According to an exemplary embodiment of the present invention, after the engine is operated in the predetermined operation mode such that the coolant temperature becomes the predetermined first temperature or more, the heater of the thermostat may be operated, thereby smoothly filling the coolant even when the coolant temperature is lower than the predetermined first temperature.
Preferably, in the coolant filling mode, the diagnostic device is configured to apply the control duty value to the thermostat and apply the control signal to the ECU such that the engine of the vehicle is operated by alternately switching between a third operating mode for operating the engine at a predetermined third RPM for a third predetermined period of time and a fourth operating mode for operating the engine at a fourth RPM different from the third RPM for a fourth predetermined period of time.
According to an exemplary embodiment of the present invention, it is possible to operate the engine in a predetermined operation mode while operating the heater of the thermostat, thereby increasing the coolant temperature more rapidly to the change temperature of the thermostat.
The method for filling coolant in a cooling system of a vehicle may further include: determining that the coolant filling mode entry condition is satisfied when at least any one of the following conditions is satisfied: when the engine of the vehicle is running, the transmission of the vehicle is in park shift gear (P gear) and the vehicle speed is zero.
Determining that the coolant filling mode release condition has been reached when at least any one of the following conditions is satisfied: the coolant temperature is equal to or greater than the second temperature, the coolant filling mode is selected to be ended by using the diagnostic device, the vehicle (coolant) filling mode entry condition is not satisfied, and an abnormality occurs in the electronic component.
The present invention is a diagnostic device configured to fill coolant using a method for filling coolant.
According to the exemplary embodiments of the present invention, unlike the conventional method for filling coolant that relies on manual operation by an operator, the coolant filling operation may be automatically performed by the diagnostic device, thereby eliminating the need to invest additional labor after the coolant injection apparatus is set, and improving coolant injection convenience.
Further, the coolant filling operation can be automatically performed by the diagnostic device, so that the coolant filling performance can be ensured to some extent regardless of the skill of the person involved.
Further, the time required for the coolant injection can be shortened as compared with the related art, and a sufficient amount of coolant can be injected into each component of the cooling system.
The present invention can be applied not only to a vehicle having a cooling system employing an electric thermostat but also to a cooling system employing a mechanical thermostat, and can exert the same operations and effects as those of the present invention described above even in the cooling system employing a mechanical thermostat.
Other features and advantages of the methods and apparatus of the present invention will be apparent from, or are set forth in more detail in, the accompanying drawings, which are incorporated herein, and the following detailed description, which together serve to explain certain principles of the present invention.
Drawings
Fig. 1 is a flowchart illustrating a method of injecting coolant into a vehicle by using a method of filling coolant in a cooling system of the vehicle according to an exemplary embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method of filling a cooling system of a vehicle with coolant according to an exemplary embodiment of the present invention in a vehicle having a cooling system employing a mechanical thermostat.
Fig. 3 is a flowchart illustrating a method of filling a cooling system of a vehicle with coolant according to an exemplary embodiment of the present invention in a vehicle having the cooling system employing an thermostat.
Fig. 4A is a graph showing the temperature of the coolant as a function of time when the coolant is injected according to the comparative example.
Fig. 4B is a graph illustrating a temperature of coolant as time passes when coolant is injected according to an exemplary embodiment of the present invention.
Fig. 4C is a graph illustrating a temperature of coolant as time passes when coolant is injected according to various exemplary embodiments of the present invention.
Fig. 5A is a schematic view schematically showing the structure of an ideal cooling system, and fig. 5B is a schematic view sequentially showing the flow of the injected cooling liquid in fig. 5A.
Fig. 6A is a schematic diagram schematically illustrating the structure of an actual cooling system, and fig. 6B is a schematic diagram sequentially illustrating the flow of the injected cooling liquid in fig. 6A.
Fig. 7 is a graph showing a temperature change of coolant with time when coolant is injected according to a conventional method.
It should be understood that the drawings are not drawn to scale, but rather are presented in a somewhat simplified form illustrating various features of the basic principles of the invention. The specific design features of the invention incorporated herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the particular intended application and environment of use.
In the drawings, like numerals refer to like or equivalent parts throughout the several views of the drawings.
Detailed Description
Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the present invention will be described in conjunction with the exemplary embodiments of the present invention, it will be understood that this description is not intended to limit the invention to those exemplary embodiments. On the other hand, the present invention is intended to cover not only exemplary embodiments of the present invention, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the present invention as defined by the appended claims.
The present invention will be described in detail below with reference to the attached drawings. However, a detailed description of known functions and configurations which may unnecessarily obscure the gist of the present invention will be omitted.
Fig. 1 is a flowchart illustrating a method of actually injecting coolant into a vehicle by using a method of filling coolant in a cooling system of the vehicle according to an exemplary embodiment of the present invention.
As shown in fig. 1, when coolant is injected into a vehicle by using a method of filling coolant in a cooling system of a vehicle according to an exemplary embodiment of the present invention, first, a radiator cover is opened in a stopped state to inject a certain amount of coolant into the vehicle until the coolant no longer enters through a coolant injection port 20 (S100). The injection amount of the coolant may be different amounts depending on the vehicle and the injection state.
Next, the operator connects the diagnostic device to an interface provided in the vehicle (S200). The Diagnostic device is a Diagnostic device disposed in a vehicle driven by a General Diagnostic System (GDS).
In exemplary embodiments of the presently claimed invention, the diagnostic device may include a controller, which may be at least one microprocessor operated by a predetermined program, which may include a series of commands for performing methods according to various exemplary embodiments of the present invention.
When the connection state of the diagnosis device is confirmed, the vehicle is started (S300), and the coolant filling mode is operated by using the diagnosis device in a state where the engine of the vehicle is in a predetermined operation state (e.g., an idle state) (S400). The operation of the coolant filling mode may be started by an operator inputting a predetermined instruction to the diagnostic apparatus or pressing a specific button provided in the diagnostic apparatus.
In a coolant filling mode that will be described later, coolant filling control that will be described later with reference to fig. 2 and 3 is executed. In this way, when a predetermined coolant charge mode release condition is satisfied after the coolant charge mode is started, the coolant charge mode is released and the engine is stopped (S500).
The vehicle is left for a predetermined time such that the coolant is lowered to an appropriate water temperature after the engine is stopped (S600).
Fig. 2 is a flowchart illustrating a method of filling a cooling system of a vehicle with coolant according to an exemplary embodiment of the present invention in a vehicle having a cooling system employing a mechanical thermostat. In fig. 2, referring to the coolant filling mode (S400) shown in fig. 1, a method for filling coolant according to an exemplary embodiment of the present invention will be described in more detail.
As shown in fig. 2, the diagnostic device is connected to a predetermined interface of the vehicle that has stopped (S10).
The operator selects the coolant filling mode by operating a predetermined switch provided in the diagnostic device or inputting a predetermined command into the GDS program through an input device such as a keyboard (S11).
When the coolant filling mode is selected in S11, the diagnostic device determines whether a predetermined coolant filling mode entry condition is satisfied (S12). The coolant filling mode entry condition refers to a basic condition that needs to be satisfied in order to stably perform the coolant filling operation. Even when the operator selects the coolant filling mode, the coolant filling mode cannot be performed if the predetermined coolant filling mode entry condition is not satisfied.
Determining that the coolant filling mode entry condition is satisfied when at least any one of the following conditions is satisfied: when the engine of the vehicle is running, the transmission of the vehicle is in park shift gear (P gear) and the vehicle speed is zero.
When it is determined in S12 that the coolant filling mode entering condition is satisfied, the diagnostic device enters the coolant filling mode (S13).
Meanwhile, it is difficult to supply an appropriate amount of coolant to the EGR cooler 100 during the coolant injection operation. Therefore, in order to prevent the EGR cooler from being damaged, etc. At the time of the coolant injection operation, the diagnosing apparatus preferably sends a control signal to a controller such as an Engine Control Unit (ECU) so that the EGR function is turned off (S14).
When the coolant filling mode is started, the diagnostic unit discharges air in the cooling system, and performs control of raising the coolant temperature to the changing temperature of the thermostat, so that an appropriate amount of coolant can be supplied to the entire cooling system. The diagnostic device is configured to control the ECU so that the
Next, the diagnostic device determines whether the coolant filling mode release condition is satisfied to determine whether the coolant has been sufficiently supplied by performing the coolant filling mode in S15 or whether the coolant filling mode can be stopped by an external condition (S16).
Preferably, the coolant filling mode release condition is determined to have been reached when at least any one of the following conditions is satisfied: the coolant temperature is equal to or greater than the predetermined second temperature, the coolant filling mode is selected to end by using the diagnostic device, the coolant filling mode entry condition in S12 is not satisfied, and the electronic component is abnormal.
Here, the second temperature refers to a temperature of a mechanical thermostat capable of changing a flow path for opening and closing the cooling system. The second temperature is preferably 85 deg.c, but the corresponding temperature range may vary depending on the characteristics of the thermostat provided in the vehicle. When it is determined that the coolant temperature is equal to or greater than the second temperature, the thermostat changes, and thus, the condition that the air in the cooling system is discharged and an appropriate amount of coolant is supplied is satisfied, and the coolant filling mode is released (S17).
Further, even when the coolant temperature does not satisfy the above-described condition, if the operator inputs a coolant filling mode end command, the coolant filling mode is cancelled (S17). Further, when the coolant filling mode entry condition determined in S12 is not satisfied, or when it is determined that an abnormality has occurred in the in-vehicle electronic components such as the coolant temperature sensor, it is difficult to stably supply the coolant, so that in this case as well, the coolant filling mode can be cancelled (S17). In this way, when the coolant is sufficiently supplied and the coolant filling mode is released, the EGR function stopped in S14 can be resumed.
Fig. 3 is a flowchart illustrating a method of filling a cooling system of a vehicle with coolant according to an exemplary embodiment of the present invention in a vehicle having the cooling system employing an thermostat. In the case of an electric thermostat provided with a heater, the thermostat can be changed by operating the heater even when the coolant temperature does not reach a predetermined temperature. Hereinafter, an exemplary embodiment of the present invention, which relates to a coolant filling mode (S400) in a vehicle having a cooling system employing an thermostat, will be described in more detail with reference to fig. 3.
S21 to S25 shown in the flowchart of fig. 3 are substantially the same as S10 to S14 shown in fig. 2. Therefore, a repetitive description of the contents described with reference to fig. 2 will be omitted.
Unlike the example shown in fig. 2, when coolant is injected into a vehicle having a cooling system employing an thermostat, Pulse Width Modulation (PWM) control (S28) for operating a heater provided in the thermostat may be performed without performing control for operating the engine at a predetermined RPM in the coolant filling mode (S400). In this case, the diagnosing device transmits a control signal for operating the heater provided in the thermostat to the ECU, and the ECU controls the heater of the thermostat according to the instruction of the diagnosing device. Meanwhile, when a control duty value of 100% is applied to the heater of the thermostat for a long time, the heater may be overheated and damaged, and therefore, it is preferable to control the heater such that a predetermined duty magnitude and a duty application time are alternately repeated with signals different from each other. For example, when controlling the heater, the diagnosing apparatus instructs control such that control of applying the control duty value of
Meanwhile, when the temperature of the coolant is lower than a certain temperature, the wax cannot be expanded to a target value even if the heater of the thermostat is operated, so that the thermostat cannot be changed. Therefore, the diagnostic apparatus determines whether the coolant temperature is equal to or greater than a predetermined first temperature (e.g., 75 ℃) (S27), and performs control of the electric thermostat in S28 only when the coolant temperature is equal to or greater than the predetermined first temperature.
However, in this case, there are the following problems: when the temperature of the cooling liquid is lower than the preset first temperature, the cooling liquid can not be filled. Therefore, in the example embodiment of the invention, before the electric thermostat is controlled in S28, primary engine operation control for operating the engine in the predetermined operation mode is executed (S26) such that the coolant temperature is equal to or greater than the predetermined first temperature.
In the primary engine operation control S26, the diagnosing apparatus instructs the ECU to alternately execute different engine operation modes, as in S15 of fig. 2. For example, the engine may be operated by alternately switching between the following operating modes: the engine was run at idle RPM for 60 seconds and the engine was run at 2000RPM for 60 seconds. As a result of the above-described control, when the coolant temperature becomes equal to or greater than the predetermined first temperature, the control of the thermostat in S28 is executed as described above.
Thus, like the exemplary embodiment in fig. 2 (S16), after the coolant filling mode is started, it is determined whether a predetermined coolant filling mode release condition is satisfied (S30), and when the corresponding condition is satisfied, the coolant filling mode is released. When a second temperature (e.g., 80 ℃) configured to change the thermostat is reached, the thermostat is changed, and thus, the condition for exhausting the air in the cooling system and supplying the appropriate amount of coolant is satisfied, the coolant filling mode is released (S31).
Further, even when the coolant temperature does not satisfy the above-described condition, if the operator inputs a coolant filling mode end command, the coolant filling mode is cancelled (S31). Further, when the coolant filling mode entry condition determined in S23 is not satisfied, or when it is determined that an abnormality has occurred in the in-vehicle electronic components such as the coolant temperature sensor and the heater of the thermostat, it is difficult to stably supply the coolant, so that in this case as well, the coolant filling mode can be cancelled (S31). In this way, when the coolant is sufficiently supplied and the coolant filling mode is released, the EGR function stopped in S25 can be resumed.
As described above, in a vehicle having a cooling system employing an electric thermostat, control is performed to operate a heater of the electric thermostat in a coolant filling mode. However, it is also possible to execute control for operating the heater of the thermostat and operating the engine in a predetermined operation mode (hereinafter referred to as "secondary engine operation control") in parallel to more quickly increase the coolant temperature to the change temperature of the thermostat.
For this purpose, in S29, the diagnostic device instructs the ECU to alternate between different engine operating modes. For example, the engine may also be operated by alternately switching between the following operating modes: the engine was run at idle RPM for 60 seconds and at 2000RPM for 40 seconds. The operating conditions of the engine for the primary engine operation control and the secondary engine operation control may be the same, or may be performed under different conditions from each other. As a result of the heater control of the thermostat and the secondary engine operation control, as described above, the coolant filling mode is released when the coolant temperature reaches a predetermined temperature configured to change the thermostat (S31).
< embodiment >
Hereinafter, by comparing the filling times of the cooling liquid according to the exemplary embodiment of the present invention and the comparative example, the operation and effect according to the exemplary embodiment of the present invention will be described with reference to fig. 4A, 4B, and 4C.
For this purpose, first, the coolant of the radiator and the thermostat of the vehicle having the cooling system employing the electric thermostat is all discharged, and the currently discharged coolant (3800 ml in this example) is measured. Thus, the radiator cover of the vehicle is opened in a stopped state, the discharged coolant is primarily injected thereinto again, and the amount of coolant remaining after the injection (480 ml in this example) is measured. Thereafter, the coolant is filled by changing the filling condition in the coolant filling mode, and the time for filling the entire remaining amount of coolant after the initial injection is measured.
In the case of case #1 as a comparative example, at the time of filling the coolant, no electric power is applied to the thermostat, and the engine is continuously operated in the idling condition, as shown in fig. 4A. In this way, in case #2, which is an exemplary embodiment of the present invention, as shown in fig. 4B, the diagnostic means is controlled so that the engine is operated in the idle state, and when the coolant temperature reaches 75 ℃ in this state, the diagnostic means is controlled so that the heater of the thermostat is operated, and when the coolant temperature reaches 85 ℃, the coolant filling mode is released. In this way, in case #3, which is another exemplary embodiment of the present invention, as shown in fig. 4C, in controlling the engine to alternately operate under the idle RPM condition and the RPM condition of 2000RPM, the diagnostic device is controlled such that the heater of the thermostat operates when the coolant temperature reaches 75 ℃, and the coolant filling mode is released when the coolant temperature reaches 85 ℃. The time required for filling for each coolant filling condition is shown in table 1 below.
TABLE 1
As shown in table 1, in case #1, the coolant is filled under the condition that the engine is in the idle state, it takes 90 minutes to reach the coolant temperature (80 ℃) of the thermostat, so that the total time required for filling the coolant is 110 minutes, which is relatively long.
Meanwhile, in case #2, when the coolant temperature is increased to 75 ℃ in a state where the engine is rotating at idle RPM, the heater of the thermostat is operated, shortening the time to reach the coolant temperature (80 ℃) of the thermostat. As a result, the total time required for filling the coolant was relatively shortened to 79.5 minutes.
Thus, in case #3, the RPM of the engine is alternately switched between idle and 2000RPM, so that the time required for the coolant temperature to rise to 75 ℃ is shortened by 7 minutes as compared with case #2, and further, the time to reach the coolant temperature (80 ℃) of the thermostat is shortened as compared with case # 2. As a result, the total time required for charging the coolant was 48.1 minutes, which was shortened as compared with case #1 and case # 2.
For convenience in explanation and accurate definition in the appended claims, the terms "above", "below", "inner", "outer", "upper", "lower", "upward", "downward", "front", "rear", "back", "inside", "outside", "inward", "outward", "inner", "outer", "forward" and "rearward" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. It will be further understood that the term "connected," or derivatives thereof, refers to both direct and indirect connections.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable others skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the following claims and their equivalents.
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