Vehicle cooling control method and vehicle

Abstract

The application provides a vehicle cooling control method and a vehicle, and belongs to the technical field of vehicles. The vehicle cooling control method comprises the following steps: acquiring a working parameter of an air conditioning system when an engine of the vehicle is in an idle speed working condition; judging whether the working parameter meets a first preset condition; and adjusting an idle speed of the engine to make a rotating speed of fan blades adapt to a cooling demand of the air conditioning system when the working parameter meets the first preset condition. The application associates the regulation and control of the idle speed of the engine with the working parameter of the air conditioning system, evaluates the cooling capacity of the air conditioning system through the working parameter, thereby realizing accurate judgment of the cooling capacity of the air conditioning system, ensuring that the idle speed of the engine is adapted to the cooling capacity of the air conditioning system, and finally realizing the effect of improving the accuracy of the idle speed control of the engine.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more specifically, to a vehicle cooling control method and a vehicle. Background Technology

[0002] An air conditioner is a device that regulates temperature by absorbing and releasing heat through a cooling medium. In a vehicle's air conditioning system, to ensure effective heat dissipation of the cooling medium, a fan is usually installed near the condenser, and the fan is driven by the engine's output shaft to accelerate the condenser's heat dissipation of the cooling medium.

[0003] In related technologies, if an air conditioner's cooling capacity is insufficient, the problem can be solved by increasing the engine's idle speed to accelerate the fan rotation. However, these technologies cannot accurately identify situations where the air conditioner's cooling capacity is insufficient, and therefore cannot accurately control the engine's idle speed. Summary of the Invention

[0004] Based on this, this application provides a vehicle cooling control method and a vehicle to solve the problem of how to improve the accuracy of engine idle speed control.

[0005] A first aspect of this application provides a vehicle cooling control method, the vehicle including an air conditioning system, the air conditioning system including fan blades for dissipating heat from a condenser, the rotational speed of the fan blades being positively correlated with the idle speed of the vehicle's engine, the method comprising:

[0006] With the vehicle's engine idling, the operating parameters of the air conditioning system are obtained;

[0007] Determine whether the operating parameters meet the first preset condition;

[0008] When the operating parameters meet the first preset condition, the idle speed of the engine is adjusted so that the speed of the fan blades is adapted to the cooling requirements of the air conditioning system.

[0009] Optionally, the operating parameters include the evaporator temperature of the air conditioning system and the pressure of the high-pressure pipe in the air conditioning system;

[0010] The step of adjusting the engine's idle speed when the operating parameters meet the first preset condition includes:

[0011] If the current operating parameters meet the first preset condition, determine the first target speed and control the engine's idle speed to increase to the first target speed;

[0012] The first preset condition includes the evaporator temperature being greater than a first temperature threshold and the pressure of the high-pressure pipe being greater than a first pressure threshold.

[0013] Optionally, determining the first target rotational speed includes:

[0014] Determine a first difference between the evaporator temperature and the first temperature threshold, and a second difference between the pressure of the high-pressure pipe and the first pressure threshold;

[0015] The first target rotational speed is determined based on the first difference and / or the second difference.

[0016] Optionally, determining the first target rotational speed includes:

[0017] Obtain the vehicle's speed;

[0018] Based on the driving speed, the first target rotational speed is determined, and the first target rotational speed decreases as the driving speed increases.

[0019] Optionally, after controlling the engine's idle speed to increase to the first target speed, the method further includes:

[0020] Determine whether the operating parameters after the engine idle speed increases meet the second preset conditions. The second preset conditions include the evaporator temperature being less than the second temperature threshold or the pressure of the high-pressure pipe being less than the second pressure threshold. Wherein, the second temperature threshold is less than the first temperature threshold and the second pressure threshold is less than the first pressure threshold.

[0021] If the conditions are met, a second target speed is determined, and the engine's idle speed is controlled to decrease to the second target speed, wherein the second target speed is less than or equal to the first target speed.

[0022] Optionally, determining the second target rotational speed includes:

[0023] Determine a third difference between the evaporator temperature and the second temperature threshold, and a fourth difference between the pressure of the high-pressure pipe and the second pressure threshold;

[0024] The second target rotational speed is determined based on the third difference and / or the fourth difference.

[0025] Optionally, before adjusting the engine's idle speed, the method further includes:

[0026] The target rate of change of the idle speed is determined based on the evaporator temperature of the air conditioning system and / or the pressure of the high-pressure pipe of the air conditioning system.

[0027] Adjusting the engine's idle speed includes:

[0028] The idle speed of the engine is adjusted to the target rate of change.

[0029] Optionally, before adjusting the engine's idle speed, the method further includes:

[0030] Based on the vehicle's travel speed, determine the target rate of change of the idle speed;

[0031] Adjusting the engine's idle speed includes:

[0032] The idle speed of the engine is adjusted to the target rate of change.

[0033] Optionally, before adjusting the engine's idle speed, the method further includes:

[0034] Obtain the ambient temperature at the location of the vehicle;

[0035] Adjusting the engine's idle speed includes:

[0036] When the ambient temperature is higher than the third temperature threshold, the idle speed of the engine is adjusted.

[0037] A second aspect of this application provides a vehicle including a control module, the control module being used to implement the steps of the vehicle cooling control method described in the first aspect of the application.

[0038] This application provides a vehicle cooling control method and a vehicle. The air conditioning system includes fan blades for dissipating heat from the condenser. The rotational speed of the fan blades is positively correlated with the idle speed of the vehicle's engine. The method includes: acquiring the operating parameters of the air conditioning system when the vehicle's engine is idling; determining whether the operating parameters meet a first preset condition; and adjusting the idle speed of the engine when the operating parameters meet the first preset condition, so that the rotational speed of the fan blades is adapted to the cooling requirements of the air conditioning system.

[0039] This application adjusts the engine's idle speed when the engine is idling and the air conditioning system's operating parameters meet a first preset condition. This application links the control of the engine's idle speed to the operating parameters of the air conditioning system. By using these parameters, the cooling capacity of the air conditioning system is evaluated, thereby achieving an accurate judgment of the air conditioning's cooling capacity. This ensures that the engine's idle speed is compatible with the air conditioning's cooling capacity, ultimately improving the accuracy of engine idle speed control. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of an air conditioning system structure provided in an embodiment of this application;

[0042] Figure 2 This is a flowchart illustrating the steps of a vehicle cooling control method provided in an embodiment of this application;

[0043] Figure 3 This is a flowchart illustrating the steps of a method for determining a first target rotational speed according to an embodiment of this application;

[0044] Figure 4 This is a flowchart illustrating another method for determining a first target rotational speed provided in an embodiment of this application;

[0045] Figure 5 This is a flowchart illustrating the steps of a method for reducing engine idle speed according to an embodiment of this application;

[0046] Figure 6 This is a flowchart illustrating the steps of a method for determining a second target rotational speed according to an embodiment of this application;

[0047] Figure 7 This is a flowchart of a vehicle cooling control method provided in an embodiment of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0049] When a vehicle is driven in a hot environment, it needs to have good heat dissipation performance to ensure that the engine and other components in the engine compartment can operate normally in complex driving scenarios. This places high demands on the fan blades used for heat dissipation in the air conditioning system.

[0050] When a vehicle equipped with a cooling fan is idling, the fan blades are driven by the engine's output shaft. Therefore, the engine's low idle speed results in a low fan blade speed, leading to insufficient airflow into the air conditioning system's condenser and causing a buildup of heat in the engine compartment. Simultaneously, the low airflow velocity and high intake temperature of the air conditioning system further increase the evaporator temperature, resulting in higher outlet air temperatures and ultimately, insufficient cooling performance.

[0051] In related technologies, if an air conditioner's cooling capacity is insufficient, the problem can be solved by increasing the engine's idle speed to accelerate the fan rotation. However, these technologies cannot accurately identify situations where the air conditioner's cooling capacity is insufficient, and therefore cannot accurately control the engine's idle speed.

[0052] Based on this, to address the problem of improving the accuracy of engine idle speed control, this application provides a vehicle cooling control method and a vehicle. When the engine is idling, the engine idle speed is adjusted when the air conditioning system operating parameters meet a first preset condition. This application links the adjustment of engine idle speed with the operating parameters of the air conditioning system. By using these parameters, the cooling capacity of the air conditioning system is evaluated, thereby achieving an accurate judgment of the air conditioning cooling capacity. This ensures that the engine idle speed is compatible with the air conditioning cooling capacity, ultimately improving the accuracy of engine idle speed control. The specific method is as follows:

[0053] The first aspect of this application provides an embodiment of a vehicle cooling control method applicable to a vehicle, the vehicle including an air conditioning system, the air conditioning system including fan blades for dissipating heat from the condenser, the rotational speed of the fan blades being positively correlated with the idle speed of the vehicle's engine.

[0054] refer to Figure 1 The diagram shows a schematic of an air conditioning system, which includes an evaporator, a compressor, a condenser, and fan blades connected to the engine output shaft. The evaporator is connected to both the compressor and the condenser, and the compressor is connected to the condenser.

[0055] During the air conditioning system's cooling of the cab, the compressor first compresses the low-pressure gaseous cooling medium flowing from the evaporator to obtain a high-pressure gaseous cooling medium. This high-pressure gaseous cooling medium is then transported to the condenser through a high-pressure pipe, where it is condensed. Simultaneously, as the condenser cools the medium, the fan blades, driven by the engine's output shaft, dissipate heat from the condenser, ensuring its effective condensation.

[0056] After the condenser completes the condensation of the cooling medium, the cooling medium changes from a high-pressure gaseous state to a high-pressure liquid state, and is further transported to the evaporator through a high-pressure pipe. During the evaporation process in the evaporator, the high-pressure liquid cooling medium continuously absorbs heat from the cab, thereby reducing the temperature of the cab.

[0057] In one alternative embodiment, the fan blades can be those of a silicone oil fan. A silicone oil fan is a fan with a built-in silicone oil lubrication system. Silicone oil is a high-viscosity oil with good lubricity and high-temperature resistance. By using silicone oil as a lubricant inside the fan bearings, silicone oil fans can effectively reduce friction, lower noise, and extend the fan's lifespan.

[0058] In one alternative embodiment, the engine's output shaft can be connected to the fan blades of the air conditioning system via a belt or chain, thereby driving the fan blades to rotate. Specifically, the engine's output shaft is equipped with a pulley or sprocket, and the belt or chain can be fixed in the groove of the pulley or sprocket. Correspondingly, the fan blade's rotating shaft is also equipped with a pulley or sprocket corresponding to the belt or chain, and the belt or chain is embedded in the groove of the pulley or sprocket on the fan blade's rotating shaft, thereby converting the rotation of the engine's output shaft into the rotation of the fan blades.

[0059] like Figure 2 The diagram illustrates a vehicle cooling control method. The method described in this application is specifically applied to the vehicle's onboard controller, and its main steps include:

[0060] Step S101: When the engine is idling, obtain the operating parameters of the air conditioning system.

[0061] Idle speed refers to the state where the engine operates at its lowest stable speed under no load. In this state, the accelerator pedal is not depressed, and the engine only maintains basic operation to drive the vehicle's accessory systems. The corresponding gear engagement for idle speed is—clutch in the engaged position and transmission in neutral. In vehicles with a carburetor fuel supply system, the engine choke should be fully open during idle speed, and the accelerator pedal should be fully released.

[0062] The operating parameters of an air conditioning system are the external characteristic parameters exhibited by the various components of the air conditioning system, such as the condenser, evaporator, compressor, and fan blades, during the operation of the air conditioning system. Specifically, these parameters may include the temperature of each component of the air conditioning system, the pressure of the air conditioning system pipelines, or the flow rate of the cooling medium in the pipelines.

[0063] In one alternative implementation, after recognizing an air conditioning activation request, the engine controller can also increase the idle speed based on the existing baseline idle speed. The baseline idle speed refers to the operating speed at which the engine operates solely to overcome its own resistance.

[0064] Step S102: Determine whether the working parameters meet the first preset condition.

[0065] Step S103: When the operating parameters meet the first preset conditions, adjust the idle speed of the engine so that the speed of the fan blades is adapted to the cooling requirements of the air conditioning system.

[0066] The operating parameters characterize the working status of the air conditioning system. Therefore, by judging whether the operating parameters of the air conditioning system meet the first preset condition, it can be determined whether the air conditioning system has insufficient cooling capacity. Then, if the air conditioning system has insufficient cooling capacity, the idle speed of the engine can be adjusted.

[0067] In one alternative implementation, the first preset condition may be the pattern of how the value of the working parameter changes over time.

[0068] In one optional implementation, before adjusting the idle speed based on operating parameters, the vehicle's speed, current gear, and driving mode can be acquired. If the vehicle's speed is less than or equal to a preset speed, the vehicle is currently in a target gear, and the current driving mode is automatic parking mode, the idle speed is adjusted based on the operating parameters. The target gear includes parking and neutral. The preset speed can be 0 km / h.

[0069] In this embodiment, when the engine is idling, the engine idle speed is adjusted under the condition that the air conditioning system operating parameters meet a first preset condition. This embodiment links the control of the engine idle speed with the operating parameters of the air conditioning system. By using these parameters, the cooling capacity of the air conditioning system is evaluated, thereby achieving an accurate judgment of the air conditioning cooling capacity. This ensures that the engine idle speed is adapted to the air conditioning cooling capacity, ultimately improving the accuracy of engine idle speed control.

[0070] In a preferred embodiment, the operating parameters include the evaporator temperature of the air conditioning system and the pressure of the high-pressure pipe in the air conditioning system. Step S103, adjusting the engine idle speed when the operating parameters meet the first preset condition, specifically includes:

[0071] Step S1031: If the current operating parameters meet the first preset conditions, determine the first target speed and control the engine's idle speed to increase to the first target speed.

[0072] The first preset condition includes the evaporator temperature being greater than a first temperature threshold and the pressure of the high-pressure pipe being greater than a first pressure threshold.

[0073] The operating parameters of an air conditioning system include the evaporator temperature and the pressure of the high-pressure pipes. An evaporator is a device used to change the refrigerant from a liquid to a gaseous state, thereby absorbing heat and lowering the temperature of the surrounding air. It is typically installed inside a vehicle, behind or below the dashboard. High-pressure pipes include the pipes connecting the compressor and condenser, and the pipes connecting the condenser and evaporator.

[0074] In one alternative implementation, the evaporator temperature can be acquired by a temperature sensor installed on the evaporator, and the pressure in the high-pressure pipe can be acquired by a pressure sensor installed in the high-pressure pipe.

[0075] Excessive pressure in the high-pressure pipe indicates that the cooling medium is not being fully condensed as it flows through the condenser, suggesting a problem with the condenser's low condensing capacity. If the evaporator temperature is also excessively high, it indicates that the condenser's condensing capacity is insufficient to meet the cooling requirements of the air conditioning system. Therefore, when the evaporator temperature exceeds the first temperature threshold and the high-pressure pipe pressure exceeds the first pressure threshold, the engine's idle speed should be increased to promote the condensation of the cooling medium.

[0076] When the evaporator temperature is less than or equal to the first temperature threshold, or the pressure of the high-pressure pipe is less than or equal to the first pressure threshold, it indicates that the condenser's condensing capacity can meet the cooling requirements of the air conditioning system. In this case, the engine's idle speed should be kept constant or the engine's idle speed should be reduced.

[0077] In one alternative implementation, the first temperature threshold may be 25°C and the first pressure threshold may be 5 MPa.

[0078] In this embodiment, when the evaporator temperature is greater than the first temperature threshold and the pressure of the high-pressure pipe is greater than the first pressure threshold, the engine idle speed is increased. Thus, when the cooling capacity of the air conditioning system is insufficient, the cooling capacity of the air conditioning is improved in a timely manner by increasing the engine idle speed, thereby effectively ensuring the cooling effect of the air conditioning.

[0079] In a preferred embodiment, reference Figure 3 The diagram illustrates a method for determining a first target rotational speed. Step S1031, determining the first target rotational speed, specifically includes the following sub-steps:

[0080] Sub-step S11: Determine the first difference between the evaporator temperature and the first temperature threshold, and the second difference between the pressure of the high-pressure pipe and the first pressure threshold.

[0081] Sub-step S12: Determine the first target rotational speed based on the first difference and / or the second difference.

[0082] The first and second differences actually represent the gap between the current cooling capacity of the air conditioning system and the required cooling capacity of the air conditioner. The larger the first difference, the greater the gap between the current cooling capacity of the air conditioning system and the required cooling capacity of the air conditioner; the larger the second difference, the greater the gap between the current cooling capacity of the air conditioning system and the required cooling capacity of the air conditioner.

[0083] Therefore, the first target speed can be determined based on a first difference, a second difference, or both. Specifically, when the first target speed is determined based on the first difference, the first target speed should increase as the first difference increases; when the first target speed is determined based on the second difference, the first target speed should increase as the second difference increases; and when the first target speed is determined based on both the first and second differences, the first target speed can increase as the sum of the first and second differences increases.

[0084] This embodiment determines the first target speed based on the first difference and the second difference, which can make the increase in engine idle speed adapt to the cooling capacity gap of the air conditioner, thereby avoiding the occurrence of insufficient or excessive increase in idle speed and realizing accurate control of engine idle speed.

[0085] In a preferred embodiment, reference Figure 4 The diagram shows another method for determining the first target rotational speed. Step S1031, determining the first target rotational speed, specifically includes the following sub-steps:

[0086] Sub-step S21: Obtain the vehicle's driving speed.

[0087] Sub-step S22: Determine the first target rotational speed based on the driving speed.

[0088] The first target rotational speed decreases as the travel speed increases.

[0089] In one alternative implementation, the driving speed can be obtained using the vehicle's wheel speed gauge.

[0090] During the operation of an air conditioning system, the condenser needs to accelerate the airflow around it to ensure effective heat dissipation. This airflow speed depends not only on the fan blade speed but also on the vehicle's speed. Therefore, at different driving speeds, the same cooling effect from the condenser corresponds to different idle speeds.

[0091] Based on the above analysis, it can be seen that the higher the driving speed, the lower the engine idle speed can be. Therefore, the first target engine speed can be controlled to decrease as the driving speed increases.

[0092] This embodiment determines the first target speed based on the vehicle's driving speed, which can reduce the vehicle's idling speed while ensuring the condenser's heat dissipation effect, thereby reducing the vehicle's fuel consumption and increasing the vehicle's driving range.

[0093] In a preferred embodiment, reference Figure 5 The diagram illustrates a method for reducing engine idle speed. After controlling the idle speed to increase the first target speed in step S1031, the method further includes:

[0094] Step S104: Determine whether the operating parameters after the engine idle speed increases meet the second preset condition.

[0095] The second preset condition includes the evaporator temperature being less than a second temperature threshold or the pressure of the high-pressure pipe being less than a second pressure threshold; wherein, the second temperature threshold is less than the first temperature threshold, and the second pressure threshold is less than the first pressure threshold.

[0096] Step S105: If the condition is met, determine the second target speed and control the idle speed to reduce the second target speed.

[0097] The second target rotational speed is greater than or equal to the first target rotational speed.

[0098] After increasing the idle speed to the first target speed, if the pressure in the high-pressure pipe decreases, the condenser's condensing capacity is improved; if the evaporator temperature decreases, it indicates that the condenser's condensing capacity can meet the cooling requirements of the air conditioning system. Therefore, when the evaporator temperature is lower than the second temperature threshold, or the pressure in the high-pressure pipe is lower than the second pressure threshold, the idle speed should be reduced to lower the engine's fuel consumption.

[0099] In one alternative implementation, the second temperature threshold may be 20°C, and the second pressure threshold may be 4.5 MPa.

[0100] Taking a specific application scenario as an example, when the engine is idling, if the pressure of the high-pressure pipe of the air conditioning system is greater than the first pressure threshold and the evaporator temperature is greater than the first temperature threshold, the engine idle speed will be increased to the first target speed; then, if the pressure of the high-pressure pipe of the air conditioning system drops to less than the second pressure threshold, or the evaporator temperature drops to less than the second temperature threshold, the engine idle speed will be reduced to the second target speed.

[0101] In this embodiment, when the evaporator temperature is lower than the second temperature threshold or the pressure of the high-pressure pipe is lower than the second pressure threshold, the engine idle speed is reduced. This allows the engine idle speed to be reduced in a timely manner once the cooling capacity of the air conditioning system is restored, effectively reducing vehicle fuel consumption and thus increasing the vehicle's driving range.

[0102] Meanwhile, in this embodiment, the second temperature threshold is limited to be less than the first temperature threshold, and the second pressure threshold is limited to be less than the first pressure threshold. This can prevent frequent adjustments of the idle speed at the critical point when the cooling capacity of the air conditioning system is about to become insufficient, thereby extending the service life of the engine.

[0103] In a preferred embodiment, reference Figure 6 The diagram illustrates a method for determining a second target rotational speed. Step S105, determining the second target rotational speed, specifically includes the following sub-steps:

[0104] Sub-step S31: Determine a third difference between the evaporator temperature and the second temperature threshold, and a fourth difference between the pressure of the high-pressure pipe and the second pressure threshold.

[0105] Sub-step S32: Determine the second target rotational speed based on the third difference and / or the fourth difference.

[0106] The third and fourth differences actually represent the extent to which the current cooling capacity of the air conditioning system exceeds the required cooling capacity of the air conditioner. The larger the third difference, the greater the extent to which the current cooling capacity of the air conditioning system exceeds the required cooling capacity of the air conditioner; the larger the fourth difference, the greater the extent to which the current cooling capacity of the air conditioning system exceeds the required cooling capacity of the air conditioner.

[0107] Therefore, the second target speed can be determined based on the third difference, the fourth difference, or both. Specifically, when the second target speed is determined based on the third difference, the second target speed should decrease as the third difference increases; when the second target speed is determined based on the fourth difference, the second target speed should decrease as the fourth difference increases; and when the second target speed is determined based on both the third and fourth differences, the second target speed can decrease as the sum of the third and fourth differences increases.

[0108] This embodiment determines the second target speed based on the third and fourth differences, which can make the reduction of the engine's idle speed match the current cooling capacity of the air conditioner, thereby avoiding unnecessary fuel consumption of the engine.

[0109] In a preferred embodiment, before adjusting the engine idle speed in step S103, the method further includes:

[0110] Step S106: Determine the target rate of change of the idle speed based on the evaporator temperature of the air conditioning system and / or the pressure of the high-pressure pipe of the air conditioning system.

[0111] The step S103 of adjusting the engine's idle speed specifically includes: controlling the engine's idle speed to be adjusted according to the target rate of change.

[0112] A higher evaporator temperature in an air conditioning system indicates a greater need for improved cooling capacity. Similarly, a higher pressure in the high-pressure pipe of an air conditioning system also indicates a greater need for improved cooling capacity. Therefore, to achieve precise control of engine idle speed, the target rate of change for idle speed can be determined based on the evaporator temperature of the air conditioning system; or based on the pressure in the high-pressure pipe of the air conditioning system; or based on both the evaporator temperature and the high-pressure pipe pressure of the air conditioning system.

[0113] In one alternative implementation, when the target rate of change of idle speed is determined based on evaporator temperature, the target rate of change can be controlled to increase as the evaporator temperature increases; when the target rate of change is determined based on the pressure of the high-pressure pipe, the target rate of change can be controlled to increase as the pressure of the high-pressure pipe increases; when the target rate of change is determined based on both evaporator temperature and high-pressure pipe pressure, the target rate of change can be controlled to increase as the sum of the evaporator temperature and the high-pressure pipe pressure increases.

[0114] Before adjusting the engine's idle speed, this embodiment first determines the urgency of the air conditioning system's need to improve its cooling capacity based on the evaporator temperature and high-pressure pipe pressure of the air conditioning system. Then, it adjusts the engine's idle speed at a target change rate that is adapted to the urgency, thus achieving precise control of the engine's idle speed.

[0115] In a preferred embodiment, before adjusting the engine idle speed in step S103, the method further includes:

[0116] Step S107: Determine the target rate of change of the idle speed based on the vehicle's driving speed.

[0117] The step S103 of adjusting the engine's idle speed specifically includes: controlling the engine's idle speed to be adjusted according to the target rate of change.

[0118] The target rate of change of idle speed can also be determined by the vehicle speed. The faster the vehicle travels, the less important the fan blades are in the process of cooling the condenser. In this case, to ensure the smooth operation of the engine, the target rate of change can be determined to decrease as the vehicle speed increases.

[0119] This embodiment determines the target rate of change of idle speed by measuring the vehicle's driving speed. This can improve the smoothness of engine operation while ensuring the condenser's heat dissipation effect and prevent abnormal vibration of the engine caused by rapid changes in speed.

[0120] In a preferred embodiment, before adjusting the engine idle speed in step S103, the method further includes:

[0121] Step S108: Obtain the ambient temperature of the vehicle's location.

[0122] The step S103 of adjusting the engine idle speed specifically includes: adjusting the engine idle speed when the ambient temperature is higher than the third temperature threshold.

[0123] The operating parameters of an air conditioning system not only characterize its cooling capacity but also the malfunction status of its various components. Therefore, to ensure the effectiveness of engine idle speed adjustment, any changes in operating parameters due to component failures should be ruled out before adjusting the engine idle speed.

[0124] Therefore, before adjusting the engine idle speed, the ambient temperature of the vehicle's location can be obtained. If the ambient temperature is higher than the third temperature threshold, it indicates that the reduced cooling capacity of the air conditioning is caused by overheating of the surrounding environment. Therefore, adjusting the engine idle speed can improve the cooling of the condenser. If the ambient temperature is lower than or equal to the third temperature threshold, it indicates that the condenser's cooling is normal. In this case, even if the engine idle speed is adjusted, the cooling capacity of the air conditioning system cannot be changed.

[0125] In summary, if the operating parameters meet the first preset condition, the engine idle speed should be further adjusted when the ambient temperature is higher than the third temperature threshold.

[0126] In one alternative implementation, the third temperature threshold may be 30°C.

[0127] In this embodiment, when the ambient temperature is higher than the third temperature threshold, the engine idle speed is adjusted, which can effectively prevent the engine from adjusting the idle speed when the air conditioning is malfunctioning, thereby ensuring the effectiveness of the idle speed adjustment.

[0128] Based on the above embodiments, refer to Figure 7 The flowchart shown illustrates a vehicle cooling control method. The vehicle cooling control method described in this application will be illustrated below:

[0129] The vehicle cooling control method described in this application is applied to a vehicle, the vehicle including, as in... Figure 1 The air conditioning system shown. (Reference) Figure 1 As shown, the air conditioning system specifically includes an evaporator, a compressor, a condenser, and fan blades connected to the engine output shaft. The evaporator is connected to both the compressor and the condenser; the compressor is connected to the condenser; and the high-pressure pipe includes a pipe connecting the compressor and the condenser, and a pipe connecting the condenser and the evaporator.

[0130] During the air conditioning system's cooling of the cab, the compressor first compresses the low-pressure gaseous cooling medium flowing from the evaporator to obtain a high-pressure gaseous cooling medium. This high-pressure gaseous cooling medium is then transported to the condenser through a high-pressure pipe, where it is condensed. Simultaneously, as the condenser cools the medium, the fan blades, driven by the engine's output shaft, dissipate heat from the condenser, ensuring its effective condensation.

[0131] After the condenser completes the condensation of the cooling medium, the cooling medium changes from a high-pressure gaseous state to a high-pressure liquid state, and is further transported to the evaporator through a high-pressure pipe. During the evaporation process in the evaporator, the high-pressure liquid cooling medium continuously absorbs heat from the cab, thereby reducing the temperature of the cab.

[0132] The method described in this application is specifically applied to the vehicle's onboard controller and includes the following steps:

[0133] At the beginning of the method, with the engine idling, the operating parameters of the air conditioning system are obtained. Specifically, the evaporator temperature of the air conditioning system can be obtained by a temperature sensor installed on the evaporator, and the pressure of the high-pressure pipe of the air conditioning system can be obtained by a pressure sensor installed in the high-pressure pipe.

[0134] Subsequently, the target rate of change of idle speed is determined based on the evaporator temperature, or the pressure of the high-pressure pipe, or both. Alternatively, the target rate of change of idle speed can also be determined based on the vehicle's speed.

[0135] After determining the target rate of change, it is determined whether the operating parameters of the air conditioning system meet the first preset conditions, wherein the first preset conditions include the evaporator temperature being greater than the first temperature threshold and the pressure of the high-pressure pipe being greater than the first pressure threshold.

[0136] If the operating parameters do not meet the first preset condition, the method described in this application shall be terminated.

[0137] When the operating parameters meet the first preset condition, the first target rotational speed can be determined in two ways. First, determine the first difference between the evaporator temperature and a first temperature threshold, and the second difference between the high-pressure pipe pressure and a first pressure threshold; then, determine the first target rotational speed based on at least one of the first and second differences. Second, determine the first target rotational speed according to the vehicle's travel speed, wherein the first target rotational speed decreases as the travel speed increases.

[0138] After determining the first target speed, it is further determined whether the ambient temperature at the vehicle's location is greater than a third temperature threshold. If so, the engine's idle speed is controlled to increase to the first target speed at the target rate of change, based on the current speed; otherwise, the method described in this application is terminated.

[0139] After increasing the engine's idle speed, it is further determined whether the operating parameters meet the second preset conditions. These second preset conditions include an evaporator temperature lower than a second temperature threshold, or a high-pressure pipe pressure lower than a second pressure threshold.

[0140] If the operating parameters do not meet the second preset condition, the method described in this application shall be terminated.

[0141] If the operating parameters meet the second preset conditions, a third difference between the evaporator temperature and the second temperature threshold and a fourth difference between the pressure of the high-pressure pipe and the second pressure threshold are determined; then, a second target rotational speed is determined based on at least one of the third difference and the fourth difference.

[0142] After determining the second target speed, the engine idle speed is controlled to decrease to the second target speed at the target rate of change, based on the current speed.

[0143] The application also provides a vehicle, including a vehicle cooling control system provided in this application, or including a control module, the control module being used to implement the steps of the vehicle cooling control method described in the application.

[0144] This application provides a vehicle cooling control method and a vehicle, the vehicle including an air conditioning system, the air conditioning system including fan blades for dissipating heat from the condenser, the rotational speed of the fan blades being positively correlated with the idle speed of the vehicle's engine, the method including: acquiring operating parameters of the air conditioning system when the vehicle's engine is idling; determining whether the operating parameters meet a first preset condition; and adjusting the idle speed of the engine when the operating parameters meet the first preset condition, so that the rotational speed of the fan blades is adapted to the cooling requirements of the air conditioning system.

[0145] This application adjusts the engine's idle speed when the engine is idling and the air conditioning system's operating parameters meet a first preset condition. This application links the control of the engine's idle speed to the operating parameters of the air conditioning system. By using these parameters, the cooling capacity of the air conditioning system is evaluated, thereby achieving an accurate judgment of the air conditioning's cooling capacity. This ensures that the engine's idle speed is compatible with the air conditioning's cooling capacity, ultimately improving the accuracy of engine idle speed control.

[0146] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0147] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, systems, electronic devices, and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0148] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0149] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0150] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0151] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0152] The above provides a detailed description of a vehicle cooling control method and a vehicle provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A vehicle cooling control method, characterized in that, The vehicle includes an air conditioning system, the air conditioning system including fan blades for cooling the condenser, the rotational speed of the fan blades being positively correlated with the idle speed of the vehicle's engine, and the method comprising: With the engine idling, the operating parameters of the air conditioning system are obtained; Determine whether the operating parameters meet the first preset condition; When the operating parameters meet the first preset condition, the idle speed of the engine is adjusted so that the speed of the fan blades is adapted to the cooling requirements of the air conditioning system. The operating parameters include the evaporator temperature of the air conditioning system and the pressure of the high-pressure pipe in the air conditioning system. If the evaporator temperature and the pressure of the high-pressure pipe are both too high, it indicates that the condenser's condensing capacity cannot meet the cooling requirements of the air conditioning system. The step of adjusting the engine's idle speed when the operating parameters meet the first preset condition includes: If the current operating parameters meet the first preset condition, determine the first target speed and control the engine's idle speed to increase to the first target speed; The first preset condition includes that the evaporator temperature is greater than a first temperature threshold and the pressure of the high-pressure pipe is greater than a first pressure threshold. After controlling the engine to increase its idle speed to the first target speed, the method further includes: Determine whether the operating parameters after the idle speed increases meet the second preset condition. The second preset condition includes the evaporator temperature being less than the second temperature threshold or the pressure of the high-pressure pipe being less than the second pressure threshold. Wherein, the second temperature threshold is less than the first temperature threshold and the second pressure threshold is less than the first pressure threshold. If the conditions are met, a second target speed is determined, and the engine's idle speed is controlled to decrease to the second target speed, wherein the second target speed is less than or equal to the first target speed.

2. The vehicle cooling control method according to claim 1, characterized in that, Determining the first target rotational speed includes: Determine a first difference between the evaporator temperature and the first temperature threshold, and a second difference between the pressure of the high-pressure pipe and the first pressure threshold; The first target rotational speed is determined based on the first difference and / or the second difference.

3. The vehicle cooling control method according to claim 1, characterized in that, Determining the first target rotational speed includes: Obtain the vehicle's speed; Based on the driving speed, the first target rotational speed is determined, and the first target rotational speed decreases as the driving speed increases.

4. The vehicle cooling control method according to claim 1, characterized in that, Determining the second target rotational speed includes: Determine a third difference between the evaporator temperature and the second temperature threshold, and a fourth difference between the pressure of the high-pressure pipe and the second pressure threshold; The second target rotational speed is determined based on the third difference and / or the fourth difference.

5. The vehicle cooling control method according to claim 1, characterized in that, Before adjusting the engine's idle speed, the method further includes: The target rate of change of the idle speed is determined based on the evaporator temperature of the air conditioning system and / or the pressure of the high-pressure pipe of the air conditioning system. Adjusting the engine's idle speed includes: The idle speed of the engine is adjusted to the target rate of change.

6. The vehicle cooling control method according to claim 1, characterized in that, Before adjusting the engine's idle speed, the method further includes: Based on the vehicle's travel speed, determine the target rate of change of the idle speed; Adjusting the engine's idle speed includes: The idle speed of the engine is adjusted to the target rate of change.

7. The vehicle cooling control method according to claim 1, characterized in that, Before adjusting the engine's idle speed, the method further includes: Obtain the ambient temperature at the location of the vehicle; Adjusting the engine's idle speed includes: When the ambient temperature is higher than the third temperature threshold, the idle speed of the engine is adjusted.

8. A vehicle, characterized in that, The system includes a control module, which is used to implement the steps of the vehicle cooling control method according to any one of claims 1-7.

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