An automatic regulating system and method for working pressure of an automobile cooling system

Abstract

The application discloses an automatic adjusting system and method for working pressure of an automobile cooling system, which comprises a target working pressure calculating module, a target working pressure comparing module and a working pressure adjusting module; the target working pressure calculating module is used for calculating the target working pressure of the cooling system under different use environment conditions and different air conditioner running states; the target working pressure comparing module is used for comparing the target working pressure of the cooling system under different use environment conditions and different air conditioner running states in a time cycle period containing all use environment conditions and all air conditioner running states, and determining the maximum value and the minimum value of the target working pressure of the cooling system; and the working pressure adjusting module is used for measuring the actual working pressure of the cooling system, comparing the actual working pressure of the cooling system with the maximum value and the minimum value of the target working pressure of the cooling system, and controlling the working of the pressure adjusting device of the cooling system. The cooling system can keep a reasonable working pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling systems of new energy vehicles, in particular to an automatic adjusting system and method for working pressure of a vehicle cooling system. BACKGROUND

[0002] With the determination and promotion of the national "double carbon" goal, new energy vehicles such as hybrid vehicles and pure electric vehicles are developing rapidly. For hybrid vehicles, due to the addition of important components such as power batteries, drive motors and controllers on the traditional engine, the structure is complex and the working temperature of the power battery has very strict requirements. Controlling and adjusting the working pressure through changes in component working temperature, environmental temperature and driving conditions (air conditioner on and off) is an important work of the cooling system, which directly affects the thermal management needs of the vehicle. Only by ensuring that the key components of the power system work within the appropriate temperature range can the situation of limited vehicle performance or damage due to uncontrolled temperature and pressure be prevented. At present, the cooling medium of the water-cooled cooling system is mostly a mixture of ethylene glycol and pure water, and the heat that needs to be cooled and dissipated is completed by heat exchange through the cooling medium. This requires the working pressure of the cooling system to be maintained within a certain range, neither too high nor too low, and the excess gas in the cooling system also needs to be separated and discharged in time, otherwise it will affect the running effect of the entire cooling system, and even damage related components. Therefore, how to automatically adjust the working pressure of the vehicle cooling system to ensure that the working pressure of the cooling system is within a reasonable range and meets the cooling performance requirements of the vehicle is a problem currently faced. SUMMARY

[0003] The purpose of the present application is to solve the problems in the background art, and to provide an automatic adjusting system and method for working pressure of a vehicle cooling system, which is simple in structure, easy to operate and can effectively ensure that the working pressure of the cooling system is within a reasonable range.

[0004] To achieve this purpose, the automatic adjusting system for working pressure of a vehicle cooling system designed by the present application is characterized in that it comprises a target working pressure calculation module, a target working pressure comparison module and a working pressure adjusting module.

[0005] The target working pressure calculation module is used to calculate the target working pressure of the cooling system under different use environment conditions and different air conditioner operating states.

[0006] The target working pressure comparison module is used to compare the target working pressures of the cooling system under different use environment conditions and different air conditioner operating states within a time cycle period containing all use environment conditions and all air conditioner operating states, to determine the maximum and minimum values of the target working pressure of the cooling system.

[0007] The working pressure adjusting module is configured to measure an actual working pressure of the cooling system, compare the actual working pressure of the cooling system with maximum and minimum values of a target working pressure of the cooling system, and control a pressure adjusting device of the cooling system to work.

[0008] Further, the use environment conditions include low-temperature environment conditions and high-temperature environment conditions.

[0009] The target working pressure calculating module includes a low-temperature target working pressure calculating module configured to calculate a target working pressure of the cooling system in the low-temperature environment conditions and a high-temperature target working pressure calculating module configured to calculate a target working pressure of the cooling system in the high-temperature environment conditions.

[0010] Further, the air conditioner running states include an air conditioner on state and an air conditioner off state.

[0011] The low-temperature target working pressure calculating module includes a first low-temperature target working pressure calculating module configured to calculate a target working pressure of the cooling system in the low-temperature environment conditions and the air conditioner on state and a second low-temperature target working pressure calculating module configured to calculate a target working pressure of the cooling system in the low-temperature environment conditions and the air conditioner off state.

[0012] The high-temperature target working pressure calculating module includes a first high-temperature target working pressure calculating module configured to calculate a target working pressure of the cooling system in the high-temperature environment conditions and the air conditioner on state and a second high-temperature target working pressure calculating module configured to calculate a target working pressure of the cooling system in the high-temperature environment conditions and the air conditioner off state.

[0013] Further, the first low-temperature target working pressure calculating module calculates the target working pressure of the cooling system in the low-temperature environment conditions and the air conditioner on state by calculating working pressures of a power battery cooling system loop at a current temperature and a motor cooling loop at the current temperature, respectively assigning weight numbers to the working pressures of the power battery cooling system loop at the current temperature and the motor cooling loop at the current temperature, and performing weighted calculation on the working pressures of the power battery cooling system loop at the current temperature and the motor cooling loop at the current temperature with a working pressure of a hybrid engine water jacket cooling system loop when a thermostat is turned on as a reference target pressure to obtain the target working pressure of the cooling system in the low-temperature environment conditions and the air conditioner on state.

[0014] Further, the second low-temperature target working pressure calculation module calculates the target working pressure of the cooling system in the low-temperature environment condition and the air conditioner closed state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the low-temperature environment condition and the air conditioner closed state.

[0015] Further, the first high-temperature target working pressure calculation module calculates the target working pressure of the cooling system in the high-temperature environment condition and the air conditioner opened state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the high-temperature environment condition and the air conditioner opened state.

[0016] Further, the second high-temperature target working pressure calculation module calculates the target working pressure of the cooling system in the high-temperature environment condition and the air conditioner closed state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the high-temperature environment condition and the air conditioner closed state.

[0017] Further, the target working pressure comparison module compares the target working pressures of the cooling system under different use environment conditions and different air conditioner running states in a time cycle period including all use environment conditions and all air conditioner running states, and determines the maximum and minimum values of the target working pressure of the cooling system by the following method: setting a time cycle period including at least the low-temperature environment and the air conditioner on condition, the low-temperature environment and the air conditioner off condition, the high-temperature environment and the air conditioner on condition, and the high-temperature environment and the air conditioner off condition.

[0018] In the time cycle period, the four target working pressure values of the cooling system obtained by the first low-temperature target working pressure calculation module, the second low-temperature target working pressure calculation module, the first high-temperature target working pressure calculation module and the second high-temperature target working pressure calculation module are compared, and the maximum value of the four target working pressure values is taken as the maximum value of the target working pressure of the cooling system, and the minimum value of the four target working pressure values is taken as the minimum value of the target working pressure of the cooling system.

[0019] Further, the working pressure adjustment module measures the actual working pressure of the cooling system, compares the actual working pressure of the cooling system with the maximum and minimum values of the target working pressure of the cooling system, and controls the working method of the pressure adjustment device of the cooling system by the following method: obtaining the actual working pressure of the cooling system through the pressure sensor on the pressure adjustment device, comparing the actual working pressure of the cooling system with the maximum and minimum values of the target working pressure of the cooling system; if the actual working pressure of the cooling system is higher than the maximum value of the target working pressure of the cooling system, the pressure adjustment device is opened to exhaust and depressurize the cooling system, and if the actual working pressure of the cooling system is lower than the minimum value of the target working pressure of the cooling system, the pressure adjustment device remains closed to make the actual working pressure of the cooling system rise to a reasonable working range.

[0020] Still further, the automatic adjustment method of the working pressure of the automobile cooling system is characterized by comprising the following steps:

[0021] Step one: calculating the target working pressure of the cooling system under different use environment conditions and different air conditioner running states;

[0022] Step two: comparing the target working pressures of the cooling system under different use environment conditions and different air conditioner running states in a time cycle period including all use environment conditions and all air conditioner running states, and determining the maximum and minimum values of the target working pressure of the cooling system;

[0023] Step 3: Measure the actual working pressure of the cooling system, compare the actual working pressure of the cooling system with the maximum and minimum values ​​of the target working pressure of the cooling system, and control the operation of the pressure regulating device of the cooling system.

[0024] The beneficial effects of this invention are: the automatic pressure adjustment system for automotive cooling systems designed in this invention can be used in hybrid vehicles and pure electric new energy vehicles, with a wide range of applications and high working efficiency. By comparing the maximum and minimum values ​​of the target working pressure of the cooling system with the actual working pressure of the cooling system, the pressure regulating device can be controlled to automatically adjust the actual working pressure of the cooling system, effectively and stably maintaining the cooling system at a suitable working pressure state, improving the working efficiency of the cooling system, and offering convenient operation and low cost. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the module connection of the automatic adjustment system for the working pressure of the automotive cooling system in this invention;

[0026] Figure 2 This is a schematic diagram of the automatic adjustment method for the working pressure of the automotive cooling system in this invention;

[0027] Among them, 1—target working pressure calculation module (1.1—first low temperature target working pressure calculation module, 1.2—second low temperature target working pressure calculation module, 1.3—first high temperature target working pressure calculation module, 1.4—second high temperature target working pressure calculation module), 2—target working pressure comparison module, and 3—working pressure adjustment module. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 The automatic adjustment system for the working pressure of the automotive cooling system shown includes a target working pressure calculation module 1, a target working pressure comparison module 2, and a working pressure adjustment module 3.

[0030] The target working pressure calculation module 1 is configured to calculate the target working pressure of the cooling system under different use environment conditions and different air conditioner operating states. The use environment conditions include a low-temperature environment condition and a high-temperature environment condition, and the air conditioner operating states include an air conditioner on state and an air conditioner off state. The target working pressure calculation module 1 includes a first low-temperature target working pressure calculation module 1.1 configured to calculate the target working pressure of the cooling system under the low-temperature environment condition and the air conditioner on state, a second low-temperature target working pressure calculation module 1.2 configured to calculate the target working pressure of the cooling system under the low-temperature environment condition and the air conditioner off state, a first high-temperature target working pressure calculation module 1.3 configured to calculate the target working pressure of the cooling system under the high-temperature environment condition and the air conditioner on state, and a second high-temperature target working pressure calculation module 1.4 configured to calculate the target working pressure of the cooling system under the high-temperature environment condition and the air conditioner off state.

[0031] The first low-temperature target working pressure calculation module 1.1 is configured to calculate the target working pressure of the cooling system under the low-temperature environment condition and the air conditioner on state by calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature based on the working pressure of the hybrid power engine water jacket cooling system loop when the thermostat is turned on as the reference target pressure.

[0032] The second low-temperature target working pressure calculation module 1.2 is configured to calculate the target working pressure of the cooling system under the low-temperature environment condition and the air conditioner off state by calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature based on the working pressure of the hybrid power engine water jacket cooling system loop when the thermostat is turned on as the reference target pressure.

[0033] The first high-temperature target working pressure calculation module 1.3 calculates the target working pressure of the cooling system in the high-temperature environment and the air conditioner opening state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid power engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the high-temperature environment and the air conditioner opening state.

[0034] The second high-temperature target working pressure calculation module 1.4 calculates the target working pressure of the cooling system in the high-temperature environment and the air conditioner closing state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid power engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the high-temperature environment and the air conditioner closing state.

[0035] The target working pressure comparison module 2 is used to compare the target working pressure of the cooling system under different use environment conditions and different air conditioner running states in a time cycle period containing all use environment conditions and all air conditioner running states, and determine the maximum and minimum values of the target working pressure of the cooling system. The method of the target working pressure comparison module 2 to compare the target working pressure of the cooling system under different use environment conditions and different air conditioner running states in a time cycle period containing all use environment conditions and all air conditioner running states, and determine the maximum and minimum values of the target working pressure of the cooling system is as follows: a time cycle period is set, which at least includes a low-temperature environment, an air conditioner opening condition; a low-temperature environment, an air conditioner closing condition; a high-temperature environment, an air conditioner opening condition and a high-temperature environment, an air conditioner closing condition. In the time cycle period, the four target working pressure values of the cooling system obtained by the first low-temperature target working pressure calculation module 1.1, the second low-temperature target working pressure calculation module 1.2, the first high-temperature target working pressure calculation module 1.3 and the second high-temperature target working pressure calculation module 1.4 are compared, the maximum value of the four target working pressure values of the cooling system is taken as the maximum value of the target working pressure of the cooling system, and the minimum value of the four target working pressure values of the cooling system is taken as the minimum value of the target working pressure of the cooling system.

[0036] The working pressure adjustment module 3 is used to measure the actual working pressure of the cooling system, compare the actual working pressure of the cooling system with the maximum and minimum values of the target working pressure of the cooling system, and control the working of the pressure adjustment device of the cooling system. The method of the working pressure adjustment module 3 to measure the actual working pressure of the cooling system, compare the actual working pressure of the cooling system with the maximum and minimum values of the target working pressure of the cooling system, and control the working of the pressure adjustment device of the cooling system is as follows: the actual working pressure of the cooling system is obtained through the pressure sensor on the pressure adjustment device, and the actual working pressure of the cooling system is compared with the maximum value of the target working pressure of the cooling system and the minimum value of the target working pressure of the cooling system; if the actual working pressure of the cooling system is higher than the maximum value of the target working pressure of the cooling system, the pressure adjustment device is opened to exhaust and depressurize the cooling system, and if the actual working pressure of the cooling system is lower than the minimum value of the target working pressure of the cooling system, the pressure adjustment device is kept closed to make the actual working pressure of the cooling system rise to a reasonable working range.

[0037] As Figure 2 described, the automatic adjustment method of the automatic adjustment system of the working pressure of the automobile cooling system designed by the application comprises the following specific steps:

[0038] S010: Constructing the target working pressure of the cooling system in the low-temperature environment condition (Te<30℃) and the air conditioner opening state: setting the working pressure PE.ON of the hybrid engine water jacket cooling system loop as the reference target pressure when the thermostat is opened. This pressure can be obtained according to the vehicle thermal management test data. According to the aerodynamic theory and the gas experiment law, since the working pressure of the hybrid vehicle cooling system is not too high relative to the atmospheric pressure, and the temperature is not too low relative to the room temperature, it meets the applicable conditions of the approximate ideal gas. At this time, the working pressure and temperature of each loop of the system meet the relationship Pi=(Vi / V)(R·Ti / Vs), wherein Vi is the volume occupied by the gas in the different cold system loops (the volume of the exhaust device on the loop, which can be calculated by the flow of the gas passing through), V is the total volume of the cooling system, R is an empirical constant, Ti is the temperature of the different cooling system loops (Kelvin temperature, Kelvin temperature = 273 + Celsius temperature), and Vs is the effective volume of the loop. Thus, the working pressure of the power battery cooling system loop at different temperatures PB=(VB / V)(R·TB / VsB) can be obtained, wherein TB is taken in the allowable working temperature range of the power battery, VsB is the effective volume of the power battery cooling system loop, and the weight number of PB is X1; the working pressure of the motor cooling system loop at different working temperatures PM=(VM / V)(R·TM / VsM) is obtained, wherein TM is taken in the allowable working temperature range of the motor, VsM is the effective volume of the motor cooling system loop, and the weight number of PM is X2; the weight numbers X1 and X2 can be set to different values according to the allowable working temperature of the power battery and the allowable working temperature of the motor. Finally, through weighted calculation P=PE.ON+(PB·X1+PM·X2) / (X1+X2), the target working pressure PLon of the cooling system under different engine water jacket cooling liquid temperatures TE, power battery working temperatures TB, and motor working temperatures TM in the low-temperature environment condition (Te<30℃) and the air conditioner opening state is obtained.

[0039] S020: Constructing the target working pressure of the cooling system in the low-temperature environment condition (Te<30℃) and the air conditioner off state: setting the working pressure PE.ON of the hybrid engine water jacket cooling system loop as the reference target pressure at the temperature when the thermostat is opened, which can be obtained according to the vehicle thermal management test. According to the gas theory and gas experimental law, the working pressure of each loop of the system at this time satisfies the relationship Pi=(Vi / V)(R·Ti / Vs), wherein Vi is the volume occupied by the gas inside the different cooling system loops, V is the total volume of the cooling system, R is an empirical constant, and Ti is the temperature of the different cooling loops (the temperature is in Kelvin, Kelvin = 273 + Celsius). Thus, the working pressure of the power battery cooling system loop at different temperatures PB=(VB / V)(R·TB / VsB) can be obtained, and the weight number Y1 is given; the working target pressure of the motor cooling loop PM=(VM / V)(R·TM / VsM) is given, and the weight number Y2 is given; the weight numbers Y1 and Y2 can be set to different ratios according to the allowable working temperature of the power battery and the allowable working temperature of the motor. Finally, through weighted calculation P=PE.ON+(PB·Y1+PM·Y2) / (Y1+Y2), the target working pressure PLoff of the cooling system under different engine water jacket coolant temperatures TE, power battery working temperatures TB, and motor working temperatures TM in the low-temperature environment condition (Te<30℃) and the air conditioner off state is obtained.

[0040] S030: constructing the target working pressure of the cooling system in the high-temperature environment condition (Te >= 30 DEG C) and the air conditioner opening state: setting the working pressure P E. O N of the hybrid engine water jacket cooling system loop as the reference target pressure at the opening temperature of the thermostat, and the pressure can be obtained according to the whole vehicle thermal management test data. According to the aerodynamic theory and the gas experiment law, since the working pressure of the hybrid vehicle cooling system is not too high relative to the atmospheric pressure, and the temperature is not too low relative to the room temperature, the applicable conditions of the approximate ideal gas are met. At this time, the working pressure and the temperature of each loop of the system satisfy the relationship Pi = (Vi / V)(R·Ti / Vs), wherein Vi is the volume occupied by the gas inside the different cooling system loops, V is the total volume of the cooling system, R is an empirical constant, and Ti is the temperature (Kelvin temperature, Kelvin temperature = 273 + Celsius temperature) of the different cooling loops. Thus, the working pressure of the power battery cooling system loop at different temperatures PB = (VB / V)(R·TB / VsB) can be obtained, wherein TB is taken in the allowable working temperature range of the power battery, and the weight number of PB is X3; the working pressure of the motor cooling system loop at different working temperatures PM = (VM / V)(R·TM / VsM), wherein TM is taken in the allowable working temperature range of the motor, and the weight number of PM is X4; the weight numbers X3 and X4 can be set to different values according to the allowable working temperature of the power battery and the allowable working temperature of the motor. Finally, through the weighted calculation P = P E. O N + (PB.X3+PM.X4) / (X3+X4), the target working pressure PHon of the cooling system at different engine water jacket cooling liquid temperatures TE, power battery working temperatures TB and motor working temperatures TM in the high-temperature environment condition (Te >= 30 DEG C) and the air conditioner opening state is obtained.

[0041] S040: Construct the target working pressure of the cooling system in the high-temperature environment condition (Te >= 30℃) and the air conditioner opening state: Set the working pressure PE.ON of the hybrid engine water jacket cooling system loop as the reference target pressure at the opening temperature of the thermostat, which can be obtained according to the vehicle thermal management test data. According to the aerodynamic theory and the gas experiment law, since the working pressure of the hybrid vehicle cooling system is not too high relative to the atmospheric pressure and the temperature is not too low relative to the room temperature, it meets the applicable conditions of the ideal gas. At this time, the working pressure and temperature of each loop of the system meet the relationship Pi = (Vi / V)(R·Ti / Vs), wherein Vi is the volume occupied by the gas inside the different cooling system loops, V is the total volume of the cooling system, R is an empirical constant, and Ti is the temperature (Kelvin temperature, Kelvin temperature = 273 + Celsius temperature) of the different cooling loops. Thus, the working pressure of the power battery cooling system loop at different temperatures PB = (VB / V)(R·TB / VsB) can be obtained, wherein TB is taken within the allowable working temperature range of the power battery, and the weight number Y3 of PB is given; the working pressure of the motor cooling system loop at different working temperatures PM = (VM / V)(R·TM / VsM), wherein TM is taken within the allowable working temperature range of the motor, and the weight number Y4 of PM is given; the weight numbers Y3 and Y4 can be set to different values according to the allowable working temperature of the power battery and the allowable working temperature of the motor. Finally, through weighted calculation P = PE.ON + (PB·Y3 + PM·Y4) / (Y3 + Y4), the target working pressure PHoff of the cooling system in the high-temperature environment condition (Te >= 30℃) and the air conditioner opening state at different engine water jacket cooling liquid temperatures TE, power battery working temperatures TB, and motor working temperatures TM is obtained.

[0042] S050: Construct the maximum and minimum values of the target working pressure of the cooling system. Since the temperature and pressure of the hybrid vehicle in different working conditions are constantly changing, it can be set that in a cycle period t, the working conditions in this cycle period include at least the low-temperature environment condition (Te < 30℃) and the high-temperature environment condition (Te >= 30℃), and the air conditioner running conditions ON and OFF. The cycle period t can be set to different values according to different vehicle models, engine types, allowable working temperatures of the power battery, and allowable working temperatures of the motor. The working target pressures PLon, PLoff, PHon, and PHoff obtained by S010, S020, S030, and S040 are sorted in size, and finally the maximum value thereof is determined as the maximum value Pmax of the target working pressure of the cooling system, and the minimum value thereof is determined as the minimum value Pmin of the target working pressure of the cooling system.

[0043] S060: Obtain the actual working pressure inside the cooling system through the pressure sensor on the pressure regulating device housing, compare the actual working pressure with the target pressure maximum Pmax and the target pressure minimum Pmin, if the actual working pressure is higher than the target pressure Pmax, open the pressure electromagnetic valve to exhaust and depressurize the cooling system, if the actual working pressure is lower than the target pressure Pmin, close the pressure electromagnetic valve to make the actual working pressure of the cooling system rise to a reasonable working range, and ensure the normal working of the cooling system.

[0044] The automatic regulating system of the working pressure of the automobile cooling system designed by the application can be applied to hybrid electric vehicles and pure electric new energy vehicles, has a wide application range and high working efficiency. The actual working pressure of the cooling system is compared with the determined maximum and minimum values of the target working pressure of the cooling system, and the working of the pressure regulating device is controlled to automatically regulate the actual working pressure of the cooling system, effectively and stably keep the cooling system in a suitable working pressure state, and improve the working efficiency of the cooling system, which is convenient to operate and low in cost.

[0045] The above is only a preferred embodiment of the application, and does not limit the structure of the application in any form. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the application still belongs to the technical solution of the application.

Claims

1. An automatic regulating system of working pressure of an automotive cooling system, characterized in that: It comprises a target working pressure calculation module (1), a target working pressure comparison module (2) and a working pressure adjustment module (3); The target working pressure calculation module (1) is used for calculating the target working pressure of the cooling system under different use environment conditions and different air conditioner running states; The target working pressure comparison module (2) is used for comparing the target working pressure of the cooling system under different use environment conditions and different air conditioner running states in a time cycle period containing all use environment conditions and all air conditioner running states, and determining the maximum value and the minimum value of the target working pressure of the cooling system; The working pressure adjustment module (3) is used for measuring the actual working pressure of the cooling system, comparing the actual working pressure of the cooling system with the maximum value and the minimum value of the target working pressure of the cooling system, and controlling the working of the pressure adjustment device of the cooling system; The use environment conditions comprise low-temperature environment conditions and high-temperature environment conditions; The target working pressure calculation module (1) comprises a low-temperature target working pressure calculation module for calculating the target working pressure of the cooling system under low-temperature environment conditions and a high-temperature target working pressure calculation module for calculating the target working pressure of the cooling system under high-temperature environment conditions; The air conditioner running states comprise an air conditioner opening state and an air conditioner closing state; The low-temperature target working pressure calculation module comprises a first low-temperature target working pressure calculation module (1.1) for calculating the target working pressure of the cooling system under low-temperature environment conditions and the air conditioner opening state and a second low-temperature target working pressure calculation module (1.2) for calculating the target working pressure of the cooling system under low-temperature environment conditions and the air conditioner closing state; The high-temperature target working pressure calculation module comprises a first high-temperature target working pressure calculation module (1.3) for calculating the target working pressure of the cooling system under high-temperature environment conditions and the air conditioner opening state and a second high-temperature target working pressure calculation module (1.4) for calculating the target working pressure of the cooling system under high-temperature environment conditions and the air conditioner closing state; The first low-temperature target working pressure calculation module (1.1) calculates the target working pressure of the cooling system under low-temperature environment conditions and the air conditioner opening state by calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, respectively weighting the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, taking the working pressure of the hybrid engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and weighting and calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system under low-temperature environment conditions and the air conditioner opening state.

2. The system for automatic regulation of working pressure in the cooling system of an automobile as claimed in claim 1, wherein: The second low-temperature target working pressure calculation module (1.2) calculates the target working pressure of the cooling system in the low-temperature environment and the air conditioner off state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid power engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the low-temperature environment and the air conditioner off state.

3. The system for automatic regulation of working pressure in the cooling system of an automobile as claimed in claim 1, wherein: The first high-temperature target working pressure calculation module (1.3) calculates the target working pressure of the cooling system in the high-temperature environment and the air conditioner on state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid power engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the high-temperature environment and the air conditioner on state.

4. The system for automatic regulation of working pressure in the cooling system of an automobile as claimed in claim 1, wherein: The second high-temperature target working pressure calculation module (1.4) calculates the target working pressure of the cooling system in the high-temperature environment and the air conditioner off state by the following method: calculating the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature, and respectively assigning a weight number to the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature; taking the working pressure of the hybrid power engine water jacket cooling system loop when the thermostat is opened as the reference target pressure, and performing weighted calculation on the working pressure of the power battery cooling system loop at the current temperature and the working pressure of the motor cooling loop at the current temperature to obtain the target working pressure of the cooling system in the high-temperature environment and the air conditioner off state.

5. The system for automatic regulation of working pressure in the cooling system of an automobile as claimed in claim 1, wherein: The target working pressure comparison module (2) compares the sizes of the target working pressures of the cooling system in different use environment conditions and different air conditioner running states in a time cycle period including all use environment conditions and all air conditioner running states, and determines the maximum and minimum values of the target working pressure of the cooling system by the following method: setting a time cycle period, which at least includes the low-temperature environment, the air conditioner on condition, the low-temperature environment, the air conditioner off condition, the high-temperature environment, the air conditioner on condition, and the high-temperature environment, the air conditioner off condition. ​ In the time cycle, the four target working pressure values of the cooling system obtained by the first low temperature target working pressure calculation module (1.1), the second low temperature target working pressure calculation module (1.2), the first high temperature target working pressure calculation module (1.3) and the second high temperature target working pressure calculation module (1.4) are compared, the maximum value of the four target working pressure values of the cooling system is taken as the maximum value of the target working pressure of the cooling system, and the minimum value of the four target working pressure values of the cooling system is taken as the minimum value of the target working pressure of the cooling system.

6. The system for automatic regulation of working pressure in the cooling system of an automobile as claimed in claim 5, wherein: The working pressure adjustment module (3) measures the actual working pressure of the cooling system, compares the actual working pressure of the cooling system with the maximum value and the minimum value of the target working pressure of the cooling system, and the method for controlling the working pressure adjustment device of the cooling system is that: the actual working pressure of the cooling system is obtained through the pressure sensor on the pressure adjustment device, and the actual working pressure of the cooling system is compared with the maximum value and the minimum value of the target working pressure of the cooling system; if the actual working pressure of the cooling system is higher than the maximum value of the target working pressure of the cooling system, the pressure adjustment device is opened, the cooling system is exhausted and depressurized, and if the actual working pressure of the cooling system is lower than the minimum value of the target working pressure of the cooling system, the pressure adjustment device remains closed, so that the actual working pressure of the cooling system rises to a reasonable working range.

7. A method for automatically adjusting the operating pressure of an automotive cooling system based on the automatically adjusting system of the operating pressure of an automotive cooling system according to any one of claims 1 to 6, characterized in that: It comprises the following steps: Step one: calculating the target working pressure of the cooling system under different use environment conditions and different air conditioner running states; Step two: comparing the target working pressure of the cooling system under different use environment conditions and different air conditioner running states in a time cycle containing all use environment conditions and all air conditioner running states, and determining the maximum value and the minimum value of the target working pressure of the cooling system; Step three: measuring the actual working pressure of the cooling system, comparing the actual working pressure of the cooling system with the maximum value and the minimum value of the target working pressure of the cooling system, and controlling the working of the pressure adjustment device of the cooling system.

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