阅读说明：本技术 一种电动卡车整车热管理系统控制方法及其系统 (Control method and system for whole electric truck thermal management system ) 是由 曾子聪 杨勇 李育方 王善超 于 2021-01-04 设计创作，主要内容包括：本发明公开了一种电动卡车整车热管理系统控制方法,包括：获取驾驶室当前温度T-(c0)和目标温度T-(c1)；获取电池管理控制系统当前电池温度T-(b0)和目标电池温度T-(b1)；根据驾驶室当前温度T-(c0)、驾驶室目标温度T-(c1)、当前电池温度T-(b0)和目标电池温度T-(b1)的值,计算出冷媒系统管理模块中压缩机的目标转速,以根据目标转速控制压缩机的转速；根据驾驶室目标温度T-(c1)与目标电池温度T-(b1)的差值计算出冷媒电子膨胀阀的目标开度,以根据目标开度控制电池热管理冷媒控制系统与空调热管理系统的冷媒分配。本发明可以合理化控制电池工作温度,解决动力电池使用寿命低问题,降低整车空调和电池热管理的能耗。(The invention discloses a control method of a whole electric truck heat management system, which comprises the following steps: obtaining the current temperature T of the cab c0 And a target temperature T c1 (ii) a Obtaining the current battery temperature T of the battery management control system b0 And target battery temperature T b1 (ii) a According to the current temperature T of the cab c0 Target temperature T of driver's cab c1 Current battery temperature T b0 And target battery temperature T b1 Calculating the target rotating speed of the compressor in the refrigerant system management module so as to control the rotating speed of the compressor according to the target rotating speed; according to the target temperature T of the cab c1 And target battery temperature T b1 And calculating the target opening of the refrigerant electronic expansion valve to control the refrigerant distribution of the battery heat management refrigerant control system and the air-conditioning heat management system according to the target opening. The invention can reasonably control the working temperature of the battery, solve the problem of low service life of the power battery and reduce the energy consumption of the air conditioner of the whole vehicle and the thermal management of the battery.)

1. A control method for a whole electric truck thermal management system is characterized by comprising the following steps:

get driver's cabinAfter the electric signal transmitted by the sensor module is converted into the current temperature T of the cab_c0And obtaining the target temperature T of the cab set in the air conditioner controller_c1；

Obtaining the current battery temperature T of the battery management control system_b0And target battery temperature T_b1；

According to the current temperature T of the cab_c0The target temperature T of the cab_c1The current battery temperature T_b0And the target battery temperature T_b1Calculating a target rotating speed of a compressor in a refrigerant system management module, and outputting the target rotating speed to the refrigerant system management module so as to control the rotating speed of the compressor according to the target rotating speed;

according to the target temperature T of the cab_c1And the target battery temperature T_b1And calculating the target opening of the refrigerant electronic expansion valve, and outputting the target opening to the refrigerant system management module so as to control the refrigerant distribution of the battery heat management refrigerant control system and the air conditioner heat management system according to the target opening.

2. The control method of the overall thermal management system of the electric truck as claimed in claim 1, further comprising the steps of: the rotating speed of the water pump is transmitted through the CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery.

3. The control method of the overall thermal management system of the electric truck as claimed in claim 2, further comprising the steps of: and outputting heating power to the PTC, wherein the PTC heats to raise the temperature of the antifreeze solution.

4. The control method of the overall thermal management system of the electric truck as claimed in claim 1, further comprising the steps of: and adjusting the rotating speed of the electronic fan to adapt to the pressure requirement of the refrigerant according to the pressure signal of the refrigerant at the outlet of the condenser, which is transmitted by the pressure sensor of the refrigerant.

5. The control method of the overall thermal management system of the electric truck as claimed in claim 1, further comprising the steps of: and adjusting the opening of the electronic expansion valve according to the refrigerant state signal at the outlet of the battery cooling heat exchanger transmitted by the refrigerant pressure sensor and the refrigerant temperature sensor.

6. The control method for the whole electric truck thermal management system according to any one of claims 1 to 5, characterized by further comprising the steps of: and after the fault signals of the compressor, the PTC, the battery management control system, the water pump or the air conditioner controller are received, the corresponding control fault module stops, and a fault message of the whole vehicle is fed back.

7. The whole electric truck thermal management system is characterized by comprising a thermal management ECU module, wherein the thermal management ECU module is used for:

after the electric signal transmitted by the cab sensor module is obtained, the electric signal is converted into the current temperature T of the cab_c0And obtaining the target temperature T of the cab set in the air conditioner controller_c1；

Obtaining the current battery temperature T of the battery management control system_b0And target battery temperature T_b1；

According to the current temperature T of the cab_c0The target temperature T of the cab_c1The current battery temperature T_b0And the target battery temperature T_b1Calculating a target rotating speed of a compressor in a refrigerant system management module, and outputting the target rotating speed to the refrigerant system management module so as to control the rotating speed of the compressor according to the target rotating speed;

according to the target temperature T of the cab_c1And the target battery temperature T_b1And calculating the target opening of the refrigerant electronic expansion valve, and outputting the target opening to the refrigerant system management module so as to control the refrigerant distribution of the battery heat management refrigerant control system and the air conditioner heat management system according to the target opening.

8. The electric truck vehicle thermal management system of claim 7, wherein the thermal management ECU module is further configured to:

the rotating speed of the water pump is transmitted through a CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery;

outputting heating power to a PTC, wherein the PTC heats to raise the temperature of the antifreeze;

adjusting the rotating speed of the electronic fan to adapt to the pressure requirement of the refrigerant according to the pressure signal of the refrigerant at the outlet of the condenser, which is transmitted by the pressure sensor of the refrigerant;

and after the fault signals of the compressor, the PTC, the battery management control system, the water pump or the air conditioner controller are received, the corresponding control fault module stops, and a fault message of the whole vehicle is fed back.

9. The electric truck whole vehicle thermal management system of claim 7, further comprising a cab sensor module, a battery thermal management module, an air conditioning management module and a system control sensor module;

the cab sensor module comprises an illumination sensor, an outdoor temperature sensor, an air duct temperature sensor and an evaporator temperature sensor, and is used for sensing outdoor temperature, air duct temperature, evaporator temperature and illumination intensity and converting the outdoor temperature, the air duct temperature, the evaporator temperature and the illumination intensity into electric signals;

the battery thermal management module comprises a battery thermal management control system and is used for controlling the current battery temperature T_b0And target battery temperature T_b1The CAN signal is input to the thermal management ECU module;

the air conditioner management module comprises an air conditioner controller and is used for controlling the air volume of an air blower inside the cab, the opening and closing angle of a cold and warm air door motor and the opening and closing angle of a mode air door motor so as to further control the distribution of cold air cooled by the evaporator;

the system control sensor module comprises a refrigerant temperature sensor and a refrigerant pressure sensor and is used for sensing the state of a refrigerant in the refrigerant system circulation.

Technical Field

The invention relates to the technical field of vehicle air conditioners, in particular to a whole vehicle thermal management control method and a whole vehicle thermal management control system for an electric truck.

Background

In recent years, electric trucks have become more and more popular, and a whole truck thermal management system of the electric truck mainly comprises three thermal management systems, namely an air conditioning system, a battery thermal management system and an electric control cooling system. At present, a plurality of technologies in the field of electric trucks are not mature, only a battery pack is used as an energy source, in the independent operation process of three thermal management systems, the requirement on arrangement space is high, the generalization degree of parts is low, and a large amount of battery electric energy is wasted. Due to the complex operation condition of the electric truck, the automobile battery pack needs to be subjected to severe environmental influences such as high temperature and low temperature. Research shows that the battery pack, particularly the lithium battery pack, is sensitive to the temperature of the working environment. When the temperature is higher, the aging speed of the battery material is accelerated, and the cycle service life is rapidly reduced; when the temperature is lower, the charge and discharge capacity of the battery is reduced, and the battery can be subjected to irreversible capacity attenuation when the battery works in a low-temperature environment, so that the service life of the battery is reduced.

The performance of the air conditioning system directly influences the comfort of drivers and passengers, and the air conditioner of the electric truck needs to consume a large amount of battery electric energy in operation, which accounts for about 10% of the energy consumption of the whole truck in summer.

In sum, under the contradiction that the demand for light weight of the electric truck is increasingly improved and the energy density of the battery pack cannot be further improved. The system integration is improved, and the optimization of the system energy consumption becomes important in the thermal management application of the electric truck.

Disclosure of Invention

The invention aims to provide a control method of a whole vehicle thermal management system of an electric truck, and aims to solve the problems that an original independent battery thermal management host is large in size, low in part generalization degree, low in service life of a power battery and high in whole vehicle air conditioner and battery thermal management energy consumption.

In order to achieve the above object, an embodiment of the present invention provides a control method for a thermal management system of an electric truck, including:

after the electric signal transmitted by the cab sensor module is obtained, the electric signal is converted into the current temperature T of the cab_c0And obtaining the target temperature T of the cab set in the air conditioner controller_c1；

Obtaining the current battery temperature T of the battery management control system_b0And target battery temperature T_b1；

According to the current temperature T of the cab_c0The target temperature T of the cab_c1The current battery temperature T_b0And the target battery temperature T_b1Calculating a target rotating speed of a compressor in a refrigerant system management module, and outputting the target rotating speed to the refrigerant system management module so as to control the rotating speed of the compressor according to the target rotating speed;

according to the target temperature T of the cab_c1And the target battery temperature T_b1The difference value of the difference value is calculated to obtain a target opening degree of the refrigerant electronic expansion valve, and the target opening degree is output to the refrigerant system management module to control according to the target opening degreeAnd refrigerant distribution of the battery heat management refrigerant control system and the air-conditioning heat management system.

In one embodiment, the method further comprises the following steps: the rotating speed of the water pump is transmitted through the CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery.

In one embodiment, the method further comprises the following steps: and outputting heating power to the PTC, wherein the PTC heats to raise the temperature of the antifreeze solution.

In one embodiment, the method further comprises the following steps: and adjusting the rotating speed of the electronic fan to adapt to the pressure requirement of the refrigerant according to the pressure signal of the refrigerant at the outlet of the condenser, which is transmitted by the pressure sensor of the refrigerant.

In one embodiment, the method further comprises the following steps: and adjusting the opening of the electronic expansion valve according to the refrigerant state signal at the outlet of the battery cooling heat exchanger transmitted by the refrigerant pressure sensor and the refrigerant temperature sensor.

In one embodiment, the method further comprises the following steps: and after the fault signals of the compressor, the PTC, the battery management control system, the water pump or the air conditioner controller are received, the corresponding control fault module stops, and a fault message of the whole vehicle is fed back.

The invention also provides a whole electric truck heat management system, which comprises a heat management ECU module, wherein the heat management ECU module is used for:

after the electric signal transmitted by the cab sensor module is obtained, the electric signal is converted into the current temperature T of the cab_c0And obtaining the target temperature T of the cab set in the air conditioner controller_c1；

Obtaining the current battery temperature T of the battery management control system_b0And target battery temperature T_b1；

According to the current temperature T of the cab_c0The target temperature T of the cab_c1The current battery temperature T_b0And the target battery temperature T_b1Calculating a target rotating speed of a compressor in a refrigerant system management module, and outputting the target rotating speed to the refrigerant system management module so as to control the compression according to the target rotating speedThe rotation speed of the machine;

according to the target temperature T of the cab_c1And the target battery temperature T_b1And calculating the target opening of the refrigerant electronic expansion valve, and outputting the target opening to the refrigerant system management module so as to control the refrigerant distribution of the battery heat management refrigerant control system and the air conditioner heat management system according to the target opening.

In one embodiment, the thermal management ECU module is further configured to:

the rotating speed of the water pump is transmitted through a CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery;

outputting heating power to a PTC, wherein the PTC heats to raise the temperature of the antifreeze;

adjusting the rotating speed of the electronic fan to adapt to the pressure requirement of the refrigerant according to the pressure signal of the refrigerant at the outlet of the condenser, which is transmitted by the pressure sensor of the refrigerant;

and after the fault signals of the compressor, the PTC, the battery management control system, the water pump or the air conditioner controller are received, the corresponding control fault module stops, and a fault message of the whole vehicle is fed back.

In one embodiment, the system further comprises a cab sensor module, a battery thermal management module, an air conditioner management module and a system control sensor module;

the cab sensor module comprises an illumination sensor, an outdoor temperature sensor, an air duct temperature sensor and an evaporator temperature sensor, and is used for sensing outdoor temperature, air duct temperature, evaporator temperature and illumination intensity and converting the outdoor temperature, the air duct temperature, the evaporator temperature and the illumination intensity into electric signals;

the battery thermal management module comprises a battery thermal management control system and is used for controlling the current battery temperature T_b0And target battery temperature T_b1The CAN signal is input to the thermal management ECU module;

the air conditioner management module comprises an air conditioner controller and is used for controlling the air volume of an air blower inside the cab, the opening and closing angle of a cold and warm air door motor and the opening and closing angle of a mode air door motor so as to further control the distribution of cold air cooled by the evaporator;

the system control sensor module comprises a refrigerant temperature sensor and a refrigerant pressure sensor and is used for sensing the state of a refrigerant in the refrigerant system circulation.

According to the control method and the control system for the whole electric truck thermal management system, the energy consumption of whole truck air conditioners and battery thermal management is reduced through information interaction between the sensors and the controller, the working temperature of the battery is reasonably controlled, the problem of short service life of the power battery is solved, the fault of the thermal management control system is displayed in real time, and an additional diagnostic instrument is not required to be additionally arranged.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a control method of a thermal management system of an electric truck according to an embodiment of the present invention;

fig. 2 is a schematic flow diagram of coolant and antifreeze (solid lines represent the coolant direction, and dotted lines represent the antifreeze direction) in the overall thermal management system of the electric truck according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a control of a thermal management system of an entire electric truck according to an embodiment of the present invention;

fig. 4 is a topological diagram of interactions among modules of a thermal management system of an entire electric truck according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.

It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a method for controlling a thermal management system of an electric truck, including:

s10, after the electric signal transmitted by the cab sensor module is obtained, the electric signal is converted into the current temperature T of the cab_c0And obtaining the target temperature T of the cab set in the air conditioner controller_c1；

S20, obtaining the current battery temperature T of the battery management control system_b0And target battery temperature T_b1；

S30, according to the current temperature T of the cab_c0The target temperature T of the cab_c1The current battery temperature T_b0And the target battery temperature T_b1Calculating a target rotating speed of a compressor in a refrigerant system management module, and outputting the target rotating speed to the refrigerant system management module so as to control the rotating speed of the compressor according to the target rotating speed;

s40, according to the cab targetTemperature T_c1And the target battery temperature T_b1And calculating the target opening of the refrigerant electronic expansion valve, and outputting the target opening to the refrigerant system management module so as to control the refrigerant distribution of the battery heat management refrigerant control system and the air conditioner heat management system according to the target opening.

In this embodiment, the cab sensor module senses the relevant temperature and illumination intensity in the cab through the illumination sensor, the outdoor temperature sensor, the air duct temperature sensor and the evaporator temperature sensor, converts the sensed temperature and illumination intensity into electric signals, and inputs the electric signals to the thermal management ECU module. The thermal management ECU module obtains the electric signal transmitted by the cab sensor module and converts the electric signal into the current temperature T of the cab_c0. The thermal management ECU module receives a target temperature T of a cab set by an air conditioner controller in the air conditioner management module_c1. The BMS (i.e., the battery management control system) in the battery thermal management module will now be at the battery temperature T_b0And target battery temperature T_b1The CAN signal is input to the thermal management ECU module. According to the current temperature T of the cab_c0Target temperature T of driver's cab_c1Battery temperature T_b0Target battery temperature T_b1And the thermal management ECU module calculates and outputs the target rotating speed of the compressor to the refrigerant system management module, and the compressor controls the rotating speed of the refrigerant system management module. And calculating and outputting the opening of an electronic expansion valve in a refrigerant system management module according to the target difference between the cab and the battery to control the refrigerant distribution of a battery heat management refrigerant control system and an air conditioner heat management system.

In one embodiment, the method further comprises the following steps: the rotating speed of the water pump is transmitted through the CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery.

In this embodiment, the thermal management ECU module transmits the rotation speed of the water pump through the CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery, and reaches the inside of the power battery. When the temperature of the battery cell in the battery module is higher or lower, the rotating speed of the water pump is generally the maximum value of calibration, so that the temperature of the battery cell in the system can be rapidly exchanged, cooled or heated to meet the running requirement of the whole vehicle. When the temperature of the battery core in the battery module is about 30 ℃, the water pump is in low-speed gear operation. The work of the power battery module is beneficial to ensuring the uniform temperature of the battery core and further prolonging the service life of the power battery module.

In one embodiment, the method further comprises the following steps: and outputting heating power to the PTC, wherein the PTC heats to raise the temperature of the antifreeze solution.

In the embodiment, the heat management ECU module heats power to the PTC, and the PTC heats to raise the temperature of the antifreeze solution. The rotation speed of the water pump controls the flow rate of the antifreeze solution of the heat exchanger cooled by the battery in unit time. The flow rate of the antifreeze liquid in unit time and the heat exchange performance of the system are in a convex curve relation, namely under a certain environment, the heat exchange performance is increased along with the increase of the flow rate and then gradually reduced along with the increase of the flow rate.

In one embodiment, the method further comprises the following steps: and adjusting the rotating speed of the electronic fan to adapt to the pressure requirement of the refrigerant according to the pressure signal of the refrigerant at the outlet of the condenser, which is transmitted by the pressure sensor of the refrigerant.

In this embodiment, the refrigerant pressure sensor senses a state of a refrigerant in the refrigerant system cycle, and transmits a pressure signal to the thermal management ECU module, and the thermal management ECU module adjusts the rotation speed of the electronic fan according to the pressure signal to meet the refrigerant pressure requirement.

In one embodiment, the method further comprises the following steps: and adjusting the opening of the electronic expansion valve according to the refrigerant state signal at the outlet of the battery cooling heat exchanger transmitted by the refrigerant pressure sensor and the refrigerant temperature sensor.

In this embodiment, the refrigerant pressure sensor and the refrigerant temperature sensor detect the state of the refrigerant at the outlet of the battery cooling heat exchanger in real time, and transmit the temperature and the pressure of the refrigerant to the thermal management ECU module. The opening of the electronic expansion valve is timely adjusted to ensure that the compressor is not damaged due to liquid impact of the refrigerant.

In one embodiment, the method further comprises the following steps: and after the fault signals of the compressor, the PTC, the battery management control system, the water pump or the air conditioner controller are received, the corresponding control fault module stops, and a fault message of the whole vehicle is fed back.

Referring to fig. 3, in this embodiment, after components such as a compressor, a PTC, a battery management control system, a water pump, an air conditioner controller, etc. which have CAN signal interaction with the thermal management ECU module fail, they CAN all feed back to the thermal management ECU module. At the moment, the corresponding control module automatically stops and can feed back the fault message of the whole vehicle to achieve the system protection effect.

Referring to fig. 3, the invention further provides a whole electric truck thermal management system, which includes a thermal management ECU module, where the thermal management ECU module is configured to:

after the electric signal transmitted by the cab sensor module is obtained, the electric signal is converted into the current temperature T of the cab_c0And obtaining the target temperature T of the cab set in the air conditioner controller_c1；

Obtaining the current battery temperature T of the battery management control system_b0And target battery temperature T_b1；

According to the current temperature T of the cab_c0The target temperature T of the cab_c1The current battery temperature T_b0And the target battery temperature T_b1Calculating a target rotating speed of a compressor in a refrigerant system management module, and outputting the target rotating speed to the refrigerant system management module so as to control the rotating speed of the compressor according to the target rotating speed;

according to the target temperature T of the cab_c1And the target battery temperature T_b1And calculating the target opening of the refrigerant electronic expansion valve, and outputting the target opening to the refrigerant system management module so as to control the refrigerant distribution of the battery heat management refrigerant control system and the air conditioner heat management system according to the target opening.

In one embodiment, the thermal management ECU module is further configured to:

the rotating speed of the water pump is transmitted through a CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery;

outputting heating power to a PTC, wherein the PTC heats to raise the temperature of the antifreeze;

adjusting the rotating speed of the electronic fan to adapt to the pressure requirement of the refrigerant according to the pressure signal of the refrigerant at the outlet of the condenser, which is transmitted by the pressure sensor of the refrigerant;

and after the fault signals of the compressor, the PTC, the battery management control system, the water pump or the air conditioner controller are received, the corresponding control fault module stops, and a fault message of the whole vehicle is fed back.

In one embodiment, the system further comprises a cab sensor module, a battery thermal management module, an air conditioner management module and a system control sensor module;

the cab sensor module comprises an illumination sensor, an outdoor temperature sensor, an air duct temperature sensor and an evaporator temperature sensor, and is used for sensing outdoor temperature, air duct temperature, evaporator temperature and illumination intensity and converting the outdoor temperature, the air duct temperature, the evaporator temperature and the illumination intensity into electric signals;

the battery thermal management module comprises a battery thermal management control system and is used for controlling the current battery temperature T_b0And target battery temperature T_b1The CAN signal is input to the thermal management ECU module;

the air conditioner management module comprises an air conditioner controller and is used for controlling the air volume of an air blower inside the cab, the opening and closing angle of a cold and warm air door motor and the opening and closing angle of a mode air door motor so as to further control the distribution of cold air cooled by the evaporator;

the system control sensor module comprises a refrigerant temperature sensor and a refrigerant pressure sensor and is used for sensing the state of a refrigerant in the refrigerant system circulation.

Referring to fig. 4, in the present embodiment, the cab sensor module mainly includes a temperature sensor and an illumination sensor, and mainly senses an internal temperature value of the cab to provide a temperature signal to the air conditioner controller and provide internal feedback for the control system. The illumination sensor mainly senses solar radiation received by the cab, and when the received solar radiation is high, the current temperature value T can be given to the cab_c0And giving a positive deviation value to meet the air-conditioning operation requirement of the cab.

And in the air-conditioning management module, the air-conditioning controller controls the air volume of an air blower in the cab, the opening and closing angle of a cold-hot air door motor and the opening and closing angle of a mode air door motor to further control the distribution of cold air cooled by an evaporator so as to meet the refrigeration requirement of a driver.

And the battery thermal management module transmits the rotating speed of the water pump through a CAN signal to provide power for the antifreeze solution which cools the heat exchanger through the battery and reaches the inside of the power battery. And under the condition that the temperature of the anti-freezing liquid is too low, the heat management ECU module outputs heating power to the PTC, and the PTC heats the anti-freezing liquid to raise the temperature of the anti-freezing liquid so as to meet the real-time target temperature requirement of the power battery.

The system control sensor module comprises a refrigerant temperature sensor and a refrigerant pressure sensor, and the system control sensor module is mainly used for sensing the state of a refrigerant in the refrigerant system circulation. A refrigerant pressure sensor is arranged behind the electronic fan to ensure that the refrigerant pressure of the system is in a reasonable range, ensure that the energy consumption of the system is higher and ensure the reliability of each part in the system (the refrigerant is leaked or the parts are damaged due to overhigh pressure). The refrigerant temperature sensor ensures that the temperature of the refrigerant passing through the battery cooling heat exchanger has a certain overheat temperature, and the refrigerant state is gaseous state so as not to cause liquid impact damage to the refrigeration compressor.

According to the control method and the control system for the whole electric truck thermal management system, the energy consumption of whole truck air conditioners and battery thermal management is reduced through information interaction between the sensors and the controller, the working temperature of the battery is reasonably controlled, the problem of short service life of the power battery is solved, the fault of the thermal management control system is displayed in real time, and an additional diagnostic instrument is not required to be additionally arranged.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.