A vehicle thermal management system based on an intelligent controller

Abstract

The present application discloses a vehicle thermal management system based on an intelligent controller, which relates to the technical field of vehicles. In this vehicle thermal management system, the intelligent controller collects the real-time ambient temperature through an ambient temperature sensor and determines the corresponding first coolant cooling curve, and then obtains the first cooling rate of the first coolant cooling curve at the real-time coolant temperature; the intelligent controller also collects the real-time vehicle speed through a vehicle speed sensor and determines the corresponding second coolant cooling curve, and then obtains the second cooling rate of the second coolant cooling curve at the real-time coolant temperature, and then controls the coolant radiator fan according to the first cooling rate and the second cooling rate. Based on the temperature of the engine coolant, the intelligent controller comprehensively considers the real-time ambient temperature of the environment where the vehicle is located and the heat exchange effect generated by the vehicle speed during the vehicle driving process on the coolant cooling effect, and can more accurately adjust the vehicle temperature.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and in particular to a vehicle thermal management system based on an intelligent controller. Background Art

[0002] Vehicles and construction machinery generate a large amount of heat during operation. To maintain the normal operation of the equipment, the cooling fan is usually used to forcibly dissipate the heat to the environment, so that each device is maintained within the normal temperature range. The cooling fan is usually installed on the engine, and the rotational speed of the cooling fan changes positively with the engine speed. The higher the engine speed, the higher the rotational speed of the cooling fan and the stronger the cooling effect.

[0003] However, the heat generated by the actual vehicle is not only related to the engine speed. When the engine is operating under the conditions of low speed and large working torque, although the engine speed is low, the heat generated by the vehicle at this time is also very high. However, the rotational speed of the cooling fan is slow and the cooling effect is poor, often causing overheating. When the engine starts, the speed may be very high and then gradually decreases. At this time, the heat generated by the vehicle is actually less, and the high-speed rotation of the cooling fan for heat dissipation will cause overcooling. Therefore, the traditional method of adjusting the rotational speed of the cooling fan according to the engine speed is inaccurate in adjusting the vehicle temperature, and it is easy to cause problems such as shortening the life of the system or components, increasing energy consumption, excessive noise, and reducing work efficiency. Summary of the Invention

[0004] In view of the above problems and technical requirements, the applicant of this application proposes a vehicle thermal management system based on an intelligent controller. The technical solution of this application is as follows:

[0005] A vehicle thermal management system based on an intelligent controller, the vehicle thermal management system includes an intelligent controller, a fan assembly and a sensor assembly connected and controlled by the intelligent controller. The fan assembly includes a coolant radiator fan installed at the engine coolant of the vehicle; the sensor assembly includes a coolant temperature sensor arranged in the coolant of the vehicle engine, a vehicle speed sensor of the vehicle, and an ambient temperature sensor of the vehicle.

[0006] The intelligent controller collects the real-time coolant temperature through the coolant temperature sensor, the real-time vehicle speed through the vehicle speed sensor, and the real-time ambient temperature through the ambient temperature sensor.

[0007] The intelligent controller determines a first coolant cooling curve corresponding to the real-time ambient temperature, and determines a first cooling rate of the first coolant cooling curve at the real-time coolant temperature. Different real-time ambient temperatures correspond to different first coolant cooling curves, and each first coolant cooling curve indicates the natural cooling trend of the coolant temperature over time at the corresponding real-time ambient temperature.

[0008] The intelligent controller determines the second cooling curve of the coolant corresponding to the real-time vehicle speed and determines the second

[0009] The second cooling rate of the cooling curve at the real-time temperature of the coolant. Different real-time vehicle speeds correspond to different second cooling curves of the coolant, and each second cooling curve of the coolant indicates the temperature of the coolant at the corresponding real-time temperature.

[0010] The natural cooling trend over time at the vehicle speed;

[0011] The intelligent controller controls the coolant radiator fan according to the first cooling rate and the second cooling rate. The higher the total natural cooling rate of the first cooling rate and the second cooling rate is, the lower the speed of the coolant radiator fan is.

[0012] A further technical solution is that the method in which the intelligent controller controls the coolant radiator fan according to the first cooling rate and the second cooling rate includes:

[0013] Calculate the total natural cooling rate K1 by adding the first cooling rate and the second cooling rate;

[0014] When the total natural cooling rate K1 reaches the target cooling rate K0, the coolant radiator fan is controlled to turn off;

[0015] 5. When the total natural cooling rate K1 does not reach the target cooling rate K0, the cooling rate of the coolant radiator fan is determined to be K2 = K0 - K1;

[0016] The target speed corresponding to the fan cooling rate K2 is determined according to the pre-fitted speed cooling curve, and the coolant radiator fan is controlled according to the target speed. The speed cooling curve indicates the cooling rate corresponding to the coolant radiator fan at different speeds.

[0017] A further technical solution is that the speed cooling curve indicates the cooling rate range of the coolant radiator fan in different speed ranges, and the method for the intelligent controller to determine the target speed of the coolant radiator fan includes:

[0018] When the fan cooling rate K2 is greater than or equal to the cooling rate corresponding to the maximum speed of the coolant radiator fan, the coolant radiator fan is controlled to operate at the maximum speed;

[0019] 5 When the fan cooling rate K2 is less than the cooling rate corresponding to the maximum speed of the coolant radiator fan,

[0020] The coolant radiator fan is controlled to operate in a speed range corresponding to the cooling rate range where the fan cooling rate K2 is located.

[0021] A further technical solution thereof is that the method for the intelligent controller to determine the first coolant cooling curve and the second coolant cooling curve includes: determining the first coolant cooling curve corresponding to the temperature range where the real-time ambient temperature is located, and determining the second coolant cooling curve corresponding to the vehicle speed range where the real-time vehicle speed is located.

[0022] A further technical solution thereof is that the fan assembly further includes an intercooler fan installed on the intercooler of the vehicle, and the sensor assembly further includes an intercooler temperature sensor arranged at the air outlet of the intercooler of the vehicle;

[0023] The intelligent controller collects the real-time temperature of the intercooler through the intercooler temperature sensor, and controls the intercooler fan according to the real-time ambient temperature and the real-time temperature of the intercooler.

[0024] A further technical solution thereof is that the intelligent controller controls the intercooler fan according to the real-time ambient temperature and the real-time temperature of the intercooler, including:

[0025] When the real-time temperature of the intercooler is higher than the real-time ambient temperature, and the temperature difference between the real-time temperature of the intercooler and the real-time ambient temperature reaches the temperature difference threshold, start the intercooler fan to dissipate heat from the intercooler of the vehicle, otherwise keep the intercooler fan off.

[0026] The beneficial technical effects of this application are:

[0027] This application discloses a vehicle thermal management system based on an intelligent controller. The intelligent controller is based on the temperature of the engine coolant, and comprehensively considers the cooling effect of the heat exchange generated by the real-time ambient temperature of the environment where the vehicle is located and the vehicle speed during the vehicle driving process on the coolant, and correspondingly controls the working process of the coolant radiator fan, avoiding the problem of inaccurate control existing in the traditional method of controlling the rotation speed of the coolant radiator fan according to the engine speed. This vehicle thermal management system can adjust the vehicle temperature more accurately.

[0028] In addition to using the coolant radiator fan for vehicle thermal management, this vehicle thermal management system also uses the intercooler fan to dissipate heat from the intercooler of the vehicle, further optimizing the vehicle temperature management effect. Description of the Drawings

[0029] Figure 1 is the system structure diagram of the vehicle thermal management system in an embodiment of this application.

[0030] Figure 2 is the control flow chart of the intelligent controller for the coolant radiator fan in an embodiment of this application.

[0031] Figure 3 is the control flow chart of the intelligent controller for the coolant radiator fan in another embodiment of this application. Detailed implementation manners

[0032] The following further describes the detailed implementation manners of the present application with reference to the accompanying drawings.

[0033] The present application discloses a vehicle thermal management system based on an intelligent controller. Please refer to Figure 1 the system structure diagram of the vehicle thermal management system shown in the figure. The vehicle thermal management system includes an intelligent controller, a fan assembly and a sensor assembly connected and controlled by the intelligent controller. The fan assembly includes a coolant radiator fan installed at the engine coolant of the vehicle, and the coolant radiator fan is used to dissipate heat and cool down the engine coolant of the vehicle. The sensor assembly includes a coolant temperature sensor arranged in the coolant of the vehicle engine, a vehicle speed sensor of the vehicle, and an ambient temperature sensor of the vehicle. The vehicle speed sensor and the ambient temperature sensor of the vehicle are sensors equipped on most vehicles, so the installation positions are not described in detail in the present application.

[0034] The intelligent controller collects the real-time coolant temperature T1 through the coolant temperature sensor, the real-time vehicle speed V0 through the vehicle speed sensor, and the real-time ambient temperature T2 through the ambient temperature sensor. The vehicle thermal management method implemented by the intelligent controller includes the following processes. Please refer to Figure 2 the flow chart shown in the figure:

[0035] The intelligent controller determines a first coolant cooling curve corresponding to the real-time ambient temperature T2, and determines a first cooling rate k1 of the first coolant cooling curve at the real-time coolant temperature. This first cooling rate is the tangent rate of the first coolant cooling curve at the real-time coolant temperature. Different real-time ambient temperatures correspond to different first coolant cooling curves, and each first coolant cooling curve indicates the natural cooling trend of the coolant temperature over time at the corresponding real-time ambient temperature. When the external temperature of the environment where the vehicle is located is different, the natural cooling trend of the engine coolant is different. The higher the external temperature of the environment where the vehicle is located, the slower the natural cooling trend of the engine coolant, that is, the cooling rate is generally slower. The lower the external temperature of the environment where the vehicle is located, under the heat dissipation effect of the external environment, the faster the natural cooling rate trend of the engine coolant, that is, the cooling rate is generally faster.

[0036] The first coolant temperature reduction curve is pre-fitted by simulation or experiment and stored in the intelligent controller. To avoid errors caused by temperature fluctuations and reduce the amount of data processing while ensuring accuracy, the intelligent controller stores the first coolant temperature reduction curves corresponding to different temperature ranges. In this step, the intelligent controller determines the first coolant temperature reduction curve corresponding to the temperature range in which the real-time ambient temperature is located. The temperature ranges are custom-set according to the actual situation. For example, in one instance, the intelligent controller stores the first coolant temperature reduction curves corresponding to three different temperature ranges, including the first coolant temperature reduction curve corresponding to the temperature range below 10°C, the first coolant temperature reduction curve corresponding to the temperature range from 10°C to 30°C, and the first coolant temperature reduction curve corresponding to the temperature range above 30°C.

[0037] The intelligent controller determines the second coolant temperature reduction curve corresponding to the real-time vehicle speed V0 and determines the second temperature reduction rate k2 of the second coolant temperature reduction curve at the real-time coolant temperature. This second temperature reduction rate is the tangent rate of the second coolant temperature reduction curve at the real-time coolant temperature. Different real-time vehicle speeds correspond to different second coolant temperature reduction curves, and each second coolant temperature reduction curve indicates the natural temperature reduction trend of the coolant over time at the corresponding real-time vehicle speed. When the vehicle speed is different, the natural temperature reduction trend of the engine coolant is different. The higher the vehicle speed, the stronger the heat dissipation effect on the engine coolant due to air convection during vehicle driving, so the natural temperature reduction trend of the engine coolant is slower and the temperature reduction rate is generally faster. The slower the vehicle speed, the weaker the heat dissipation effect on the engine coolant due to air convection during vehicle driving, and the slower the natural temperature reduction rate trend of the engine coolant, that is, the temperature reduction rate is generally slower.

[0038] The second coolant temperature reduction curve is pre-fitted by simulation or experiment and stored in the intelligent controller. To avoid errors caused by temperature fluctuations and reduce the amount of data processing while ensuring accuracy, the intelligent controller stores the second coolant temperature reduction curves corresponding to different vehicle speed ranges. In this step, the intelligent controller determines the second coolant temperature reduction curve corresponding to the vehicle speed range in which the real-time vehicle speed is located. The vehicle speed ranges are custom-set according to the actual situation. For example, in one instance, the intelligent controller stores the second coolant temperature reduction curves corresponding to four different temperature ranges, including the second coolant temperature reduction curve corresponding to the vehicle speed range from 0 km / h to 20 km / h, the second coolant temperature reduction curve corresponding to the vehicle speed range from 20 km / h to 60 km / h, the second coolant temperature reduction curve corresponding to the vehicle speed range from 60 km / h to 90 km / h, and the second coolant temperature reduction curve corresponding to the vehicle speed range exceeding 90 km / h.

[0039] The intelligent controller controls the coolant radiator fan according to the first cooling rate k1 and the second cooling rate k2. The higher the total natural cooling rate obtained by adding the first cooling rate and the second cooling rate, the lower the rotational speed of the coolant radiator fan. For details, please refer to Figure 3 the flowchart shown in: Calculate the total natural cooling rate K1 obtained by adding the first cooling rate k1 and the second cooling rate k2. When the total natural cooling rate K1 reaches the target cooling rate K0, it indicates that good heat dissipation effect can be achieved through heat exchange with the external ambient temperature and convective heat exchange during vehicle driving, then control the coolant radiator fan to turn off. When the total natural cooling rate K1 does not reach the target cooling rate K0, it indicates that the required heat dissipation effect cannot be achieved only through heat exchange with the external ambient temperature and convective heat exchange during vehicle driving, then determine the fan cooling rate K2 of the coolant radiator fan = K0 - K1. Determine the target rotational speed corresponding to the fan cooling rate K2 according to the pre-fitted rotational speed-cooling curve, and control the coolant radiator fan according to the target rotational speed. The rotational speed-cooling curve indicates the cooling rate corresponding to the coolant radiator fan at different rotational speeds. Considering that it is difficult for the rotational speed of the coolant radiator fan to be stabilized at a fixed value, and frequent adjustment of the rotational speed of the coolant radiator fan is also likely to cause damage to the coolant radiator fan, therefore, in one embodiment, the rotational speed-cooling curve indicates the cooling rate range of the coolant radiator fan in different rotational speed ranges. Then, when the fan cooling rate K2 is greater than or equal to the cooling rate corresponding to the highest rotational speed of the coolant radiator fan, control the coolant radiator fan to operate at the highest rotational speed. When the fan cooling rate K2 is less than the cooling rate corresponding to the highest rotational speed of the coolant radiator fan, control the coolant radiator fan to operate according to the rotational speed range corresponding to the cooling rate range where the fan cooling rate K2 is located. In this way, it not only conforms to the working characteristics of the coolant radiator fan but also avoids frequent adjustment.

[0040] In addition, during the process of the intelligent controller controlling according to the above method, when the real-time temperature of the coolant is lower than the temperature threshold, keep the coolant radiator fan turned off continuously.

[0041] For example, in one instance, assume that the collected real-time ambient temperature T2 is 15°C and the real-time coolant temperature T1 is 87 degrees. Then the intelligent controller determines the temperature range where the real-time ambient temperature T2 is located, that is, the first coolant cooling curve corresponding to the temperature range of 10°C to 30°C, and then obtains the first cooling rate k1 of 0.8 degrees Celsius per minute. The real-time vehicle speed V0 is 70 km / h, so the intelligent controller determines the vehicle speed range where the real-time vehicle speed V0 is located, that is, the second coolant cooling curve corresponding to the vehicle speed range of 60 km / h to 90 km / h, and then obtains the second cooling rate k2 of 1.2 degrees Celsius per minute. Assume that the preset target cooling rate K0 is 3 degrees Celsius per minute. Then it is determined that the fan cooling rate K2 = 1 degree Celsius per minute, and the corresponding rotational speed range is 30% - 40% of the maximum rotational speed, and the coolant radiator fan is controlled to operate at 30% - 40% of the maximum rotational speed.

[0042] In addition, for better thermal management of the vehicle, the fan assembly further includes an intercooler fan installed on the intercooler of the vehicle, and the sensor assembly further includes an intercooler temperature sensor disposed at the air outlet of the intercooler of the vehicle. The intelligent controller collects the real-time intercooler temperature through the intercooler temperature sensor and controls the intercooler fan according to the real-time ambient temperature and the real-time intercooler temperature. In one embodiment, when the real-time intercooler temperature is higher than the real-time ambient temperature and the temperature difference between the real-time intercooler temperature and the real-time ambient temperature reaches the temperature difference threshold, the intercooler fan is started to dissipate heat from the intercooler of the vehicle; otherwise, the intercooler fan remains off.

[0043] In addition, both the coolant radiator fan and the intercooler fan will feedback the real-time fan rotational speed to the intelligent controller, and the intelligent controller can further feedback the coolant radiator fan, the intercooler fan and the fan rotational speed to the vehicle central control platform to facilitate the driver and passengers to view the operating status of the fan assembly. Then when the fan rotational speed of any one fan assembly is abnormal, the faulty fan assembly can be determined in a timely manner, which is conducive to troubleshooting in a timely manner.

[0044] The above are only the preferred embodiments of the present application, and the present application is not limited to the above embodiments. It can be understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included within the protection scope of the present application.

Claims

1. A control method for a vehicle thermal management system based on an intelligent controller, characterized in that, The control method includes a vehicle thermal management system, which includes an intelligent controller, a fan assembly and a sensor assembly connected and controlled by the intelligent controller. The fan assembly includes a coolant radiator fan installed at the engine coolant of the vehicle; the sensor assembly includes a coolant temperature sensor disposed in the engine coolant of the vehicle, a vehicle speed sensor and an ambient temperature sensor of the vehicle; The intelligent controller collects the real-time coolant temperature through the coolant temperature sensor, the real-time vehicle speed through the vehicle speed sensor, and the real-time ambient temperature through the ambient temperature sensor; The intelligent controller determines a first coolant cooling curve corresponding to the real-time ambient temperature, and determines a first cooling rate of the first coolant cooling curve at the real-time coolant temperature. Different real-time ambient temperatures correspond to different first coolant cooling curves, and each first coolant cooling curve indicates the natural cooling trend of the coolant temperature over time at the corresponding real-time ambient temperature; The intelligent controller determines a second coolant cooling curve corresponding to the real-time vehicle speed, and determines a second cooling rate of the second coolant cooling curve at the real-time coolant temperature. Different real-time vehicle speeds correspond to different second coolant cooling curves, and each second coolant cooling curve indicates the natural cooling trend of the coolant temperature over time at the corresponding real-time vehicle speed; The intelligent controller calculates the total natural cooling rate K1 obtained by adding the first cooling rate and the second cooling rate. When the total natural cooling rate K1 reaches the target cooling rate K0, the coolant radiator fan is controlled to turn off. When the total natural cooling rate K1 does not reach the target cooling rate K0, it is determined that the fan cooling rate K2 of the coolant radiator fan is K0 - K1, and the target speed corresponding to the fan cooling rate K2 is determined according to a pre-fitted speed cooling curve, and the coolant radiator fan is controlled according to the target speed. The speed cooling curve indicates the cooling rate corresponding to the coolant radiator fan at different speeds. The higher the total natural cooling rate K1 obtained by adding the first cooling rate and the second cooling rate, the lower the speed of the coolant radiator fan.

2. The control method of the vehicle thermal management system according to claim 1, wherein The speed cooling curve indicates the cooling rate range of the coolant radiator fan in different speed intervals. The method for the intelligent controller to determine the target speed of the coolant radiator fan includes: When the fan cooling rate K2 is greater than or equal to the cooling rate corresponding to the highest speed of the coolant radiator fan, the coolant radiator fan is controlled to operate at the highest speed; When the fan cooling rate K2 is less than the cooling rate corresponding to the highest speed of the coolant radiator fan, the coolant radiator fan is controlled to operate in the speed interval corresponding to the cooling rate interval where the fan cooling rate K2 is located.

3. The control method of the vehicle thermal management system according to claim 1, characterized in that The method for the intelligent controller to determine the first coolant cooling curve and the second coolant cooling curve includes: Determine the first coolant cooling curve corresponding to the temperature range where the real-time ambient temperature is located, and determine the second coolant cooling curve corresponding to the vehicle speed range where the real-time vehicle speed is located.

4. The control method of the vehicle thermal management system according to claim 1, characterized in that, The fan assembly further includes an intercooler fan installed on the intercooler of the vehicle, and the sensor assembly further includes an intercooler temperature sensor disposed at the air outlet of the intercooler of the vehicle; The intelligent controller collects the real-time temperature of the intercooler through the intercooler temperature sensor and controls the intercooler fan according to the real-time ambient temperature and the real-time temperature of the intercooler.

5. The control method of the vehicle thermal management system according to claim 4, wherein The intelligent controller controls the intercooler fan according to the real-time ambient temperature and the real-time temperature of the intercooler, including: When the real-time temperature of the intercooler is higher than the real-time ambient temperature, and the temperature difference between the real-time temperature of the intercooler and the real-time ambient temperature reaches the temperature difference threshold, start the intercooler fan to dissipate heat from the intercooler of the vehicle, otherwise keep the intercooler fan off.

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