CN114347748B

CN114347748B - Electric vehicle, control method, device and medium of air conditioner and heat management system of electric vehicle

Info

Publication number: CN114347748B
Application number: CN202111631473.8A
Authority: CN
Inventors: 鲁春雷
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2023-08-29
Anticipated expiration: 2041-12-28
Also published as: CN114347748A

Abstract

The invention provides an electric vehicle, and a control method, a device and a medium of an air conditioner and a thermal management system of the electric vehicle, wherein the vehicle comprises the following components: an in-vehicle air conditioning system and battery thermal management system, a control method comprising: acquiring a first set temperature of an in-vehicle air conditioning system and an in-vehicle temperature of a vehicle to determine a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature; acquiring the cooling liquid temperature of a battery cooling heat exchanger and a second set temperature of a battery thermal management system, and determining the capacity requirement of the battery thermal management system according to the cooling liquid temperature and the second set temperature; and controlling the opening degree of a thermal management throttle valve of the battery thermal management system and/or controlling the frequency of a compressor of the air conditioning system in the vehicle according to the determined capacity requirement of the air conditioning system in the vehicle and the capacity requirement of the battery thermal management system. The scheme provided by the invention can avoid insufficient or excessive supply of cooling capacity of an air conditioner and a battery in a vehicle caused by flow distribution difference.

Description

Electric vehicle, control method, device and medium of air conditioner and heat management system of electric vehicle

Technical Field

The present invention relates to the field of control, and in particular, to a control method, apparatus and medium for an electric vehicle and an air conditioning and thermal management system thereof, and more particularly, to a control method, apparatus and computer readable storage medium for an electric vehicle and an in-vehicle air conditioning system and a battery thermal management system thereof.

Background

At present, battery cooling systems of pure electric buses increasingly adopt a liquid cooling mode, and battery liquid cooling machines in industry are divided into independent liquid cooling units and integrated liquid cooling units. The independent battery thermal management unit needs to be provided with a set of refrigeration system, including a compressor, a condenser, an evaporator, a throttling component, a heat exchange fan and the like, has high cost and needs a separate installation space. The in-car air conditioning system integrating the battery thermal management bus air conditioner and the battery thermal management system share the components such as a compressor, a condenser, a condensing fan and the like, and generally adopts an in-car evaporator to be connected with a battery cooling liquid heat exchanger in parallel, so that the in-car refrigerating capacity and the battery cooling capacity are independently regulated. When an in-car air conditioning system and a battery cooling system work simultaneously, the actual demand difference of the refrigerant flow and the cold quantity of the two systems is larger, and a refined refrigerant flow and cold quantity control method is still lacking at present.

Disclosure of Invention

The invention aims to overcome the defects of the related art, and provides a control method, a control device, a storage medium and an air conditioner of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle, so as to solve the problem that the actual demand difference of the refrigerant flow and the cold capacity is larger when the in-vehicle air conditioning system and the battery cooling system of the electric vehicle work simultaneously in the related art.

In one aspect, the present invention provides a control method of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle, the vehicle including: the control method comprises the following steps of: acquiring a first set temperature of the in-vehicle air conditioning system and an in-vehicle temperature of the vehicle to determine a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature; acquiring the cooling liquid temperature of the battery cooling heat exchanger and a second set temperature of the battery thermal management system, and determining the capacity requirement of the battery thermal management system according to the cooling liquid temperature and the second set temperature; and controlling the opening degree of a thermal management throttle valve of the battery thermal management system and/or controlling the frequency of a compressor of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system.

Optionally, controlling the opening degree of the thermal management throttle valve of the battery thermal management system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system includes: determining a target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system; controlling the opening degree of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of a battery cooling heat exchanger of the battery thermal management system and the target superheat degree; and/or controlling a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, comprising: determining an upper limit value of a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle; and controlling the compressor frequency of the in-vehicle air conditioning system according to the determined upper limit value of the compressor frequency of the in-vehicle air conditioning system.

Optionally, determining the target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system includes: determining the target superheat degree of the battery cooling heat exchanger by utilizing the preset corresponding relation between the combination of the capability requirements of different in-vehicle air conditioning systems and the capability requirements of different battery thermal management systems and the target superheat degree according to the capability requirements of the in-vehicle air conditioning systems and the capability requirements of the battery thermal management systems; and/or controlling the opening degree of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree, including: determining the opening variable quantity of a thermal management throttle valve of the next control period of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree; and controlling the opening degree of the thermal management throttle valve according to the determined opening degree variation of the thermal management throttle valve of the battery thermal management system.

Optionally, determining the compressor frequency upper limit value of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle external environment temperature of the vehicle includes: and determining the upper limit value of the compressor frequency of the in-vehicle air conditioning system according to the capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle by utilizing the corresponding relation between the combination of the capacity requirement of different in-vehicle air conditioning systems and the capacity requirement of different battery thermal management systems under preset different environment temperature intervals and the upper limit value of the compressor frequency.

Optionally, the method further comprises: when the in-vehicle air conditioning system and the battery thermal management system run simultaneously, acquiring the superheat degree of a battery cooling heat exchanger of the battery thermal management system and acquiring the superheat degree of an air conditioning in-vehicle heat exchanger of the in-vehicle air conditioning system; determining a first opening variable quantity of a thermal management throttle valve of a next control period of the battery thermal management system according to the obtained superheat degree of the battery cooling heat exchanger, and determining a second opening variable quantity of an air conditioning throttle valve of the next control period of the in-vehicle air conditioning system according to the obtained superheat degree of the in-vehicle air conditioning system; and controlling the opening of the thermal management throttle according to the determined first opening variation, and controlling the opening of the in-vehicle air-conditioning throttle according to the determined second opening variation.

Another aspect of the present invention provides a control device for an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle, characterized in that the vehicle includes: the control method comprises the following steps of: a first determining unit, configured to obtain a first set temperature of the in-vehicle air conditioning system and an in-vehicle temperature of the vehicle, so as to determine a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature; a second determining unit, configured to obtain a coolant temperature of the battery cooling heat exchanger and a second set temperature of the battery thermal management system, and determine a capacity requirement of the battery thermal management system according to the coolant temperature and the second set temperature; and the first control unit is used for controlling the opening degree of a thermal management throttle valve of the battery thermal management system and/or controlling the frequency of a compressor of the air conditioning system in the vehicle according to the capacity requirement of the air conditioning system in the vehicle, which is determined by the first determination unit, and the capacity requirement of the battery thermal management system, which is determined by the second determination unit.

Optionally, the first control unit controls the opening degree of a thermal management throttle valve of the battery thermal management system according to the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system determined by the first determination unit, and includes: determining a target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system; controlling the opening degree of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of a battery cooling heat exchanger of the battery thermal management system and the target superheat degree; and/or, the first control unit controls the compressor frequency of the in-vehicle air conditioning system according to the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, which are determined by the second determination unit, and the first control unit comprises: determining an upper limit value of a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle; and controlling the compressor frequency of the in-vehicle air conditioning system according to the determined upper limit value of the compressor frequency of the in-vehicle air conditioning system.

Optionally, the first control unit determines the target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, and includes: determining the target superheat degree of the battery cooling heat exchanger by utilizing the preset corresponding relation between the combination of the capability requirements of different in-vehicle air conditioning systems and the capability requirements of different battery thermal management systems and the target superheat degree according to the capability requirements of the in-vehicle air conditioning systems and the capability requirements of the battery thermal management systems; and/or, the first control unit controls the opening degree of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree, and the first control unit comprises: determining the opening variable quantity of a thermal management throttle valve of the next control period of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree; and controlling the opening degree of the thermal management throttle valve according to the determined opening degree variation of the thermal management throttle valve of the battery thermal management system.

Optionally, the first control unit determines an upper limit value of a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle, and includes: and determining the upper limit value of the compressor frequency of the in-vehicle air conditioning system according to the capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle by utilizing the corresponding relation between the combination of the capacity requirement of different in-vehicle air conditioning systems and the capacity requirement of different battery thermal management systems under preset different environment temperature intervals and the upper limit value of the compressor frequency.

Optionally, the method further comprises: the device comprises an acquisition unit, a battery heat management system and a control unit, wherein the acquisition unit is used for acquiring the superheat degree of a battery cooling heat exchanger of the battery heat management system and the superheat degree of an air-conditioning vehicle heat exchanger of the vehicle air-conditioning system when the vehicle air-conditioning system and the battery heat management system are simultaneously operated; a third determining unit, configured to determine a first opening variation of a thermal management throttle valve in a next control period of the battery thermal management system according to the degree of superheat of the battery cooling heat exchanger acquired by the acquiring unit, and determine a second opening variation of an in-vehicle air conditioning throttle valve in the next control period of the in-vehicle air conditioning system according to the degree of superheat of the in-vehicle air conditioning system acquired by the acquiring unit; a second control unit configured to control an opening degree of the thermal management throttle valve in accordance with the first opening degree variation determined by the third determination unit, and to control an opening degree of the in-vehicle air-conditioning throttle valve in accordance with the second opening degree variation determined by the third determination unit.

In a further aspect the invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.

In a further aspect the invention provides an electric vehicle comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the methods described hereinbefore when the program is executed.

In yet another aspect, the present invention provides an electric vehicle, including a control device of the in-vehicle air conditioning system and the battery thermal management system described in any one of the foregoing.

According to the technical scheme, based on the capacity requirement of the air conditioner in the vehicle and the requirement of the battery cooling in the vehicle, the flow distribution of the heat exchanger in the vehicle and the heat exchanger for the battery cooling is finely controlled, so that the insufficient or excessive supply of the air conditioner in the vehicle and the battery cooling cold quantity caused by the difference of the flow distribution is avoided; coupling an in-vehicle air conditioning capacity requirement with a battery cooling in-vehicle environment requirement and an in-vehicle environment temperature; the upper limit of the compressor frequency is finely controlled, and adverse effects of frequent shutdown of the compressor, high system power consumption, excessive cold and the like caused by excessive system capacity due to the fact that the upper limit of the compressor frequency is not correspondingly adjusted when the capacity requirement of the system changes are avoided.

The flow and the cold quantity of the air conditioner evaporator and the battery cooling evaporator in the vehicle are finely distributed, the reasonable distribution of the refrigerating capacity of the system is realized on the premise of ensuring the safety performance of the battery and the comfort of the air conditioner in the vehicle, the energy consumption of the system is optimized, and the energy consumption of the system is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a method schematic diagram of one embodiment of a control method for an in-vehicle air conditioning system and a battery thermal management system for an electric vehicle according to the present invention;

FIG. 2 shows a system schematic of the present invention;

FIG. 3 is a method schematic diagram of another embodiment of a control method of an in-vehicle air conditioning system and a battery thermal management system for an electric vehicle provided by the present invention;

FIG. 4 is a method schematic diagram of a control method of an in-vehicle air conditioning system and a battery thermal management system of a vehicle according to an embodiment of the present invention;

FIG. 5 is a method schematic diagram of another embodiment of a control method for an in-vehicle air conditioning system and a battery thermal management system of a vehicle provided by the present invention;

FIG. 6 is a block diagram illustrating an embodiment of a control device for an in-vehicle air conditioning system and a battery thermal management system for an electric vehicle according to the present invention;

FIG. 7 is a block diagram of another embodiment of a control device for an in-vehicle air conditioning system and a battery thermal management system for an electric vehicle according to the present invention;

The reference numerals are expressed as:

the air conditioner comprises a compressor 1, a four-way valve 2, an air conditioner external fan 3, an external heat exchanger 4, an air conditioner throttle valve 5, a heat management throttle valve 6, an air conditioner internal heat exchanger 7, an air conditioner internal fan 8, a gas-liquid separator 9, an expansion water tank 10, a battery cooling heat exchanger 11, a water pump 12 and a battery heat exchange cold plate 13.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

An electric vehicle includes an in-vehicle air conditioning system and a battery thermal management system. Fig. 2 shows a system schematic diagram which is the invention. As shown in fig. 2, the in-vehicle air conditioning system includes: the compressor 1 (specifically, may be a variable frequency scroll compressor), the four-way valve 2, the heat exchanger (condenser) 4 outside the vehicle, the heat exchanger (evaporator) 7 inside the air conditioner, the air conditioner throttle valve (specifically, a valve-closing no-flow throttle valve, which functions to throttle and/or adjust the flow, for example, an electronic expansion valve), the gas-liquid separator 9, the filter, the fan (evaporation fan) 8 inside the air conditioner, and the fan (condensation fan) 3 outside the air conditioner. The battery thermal management system includes: the refrigerant loop and the secondary refrigerant system share a compressor 1, an in-vehicle heat exchanger (condenser) 4 and an air conditioner out-of-vehicle fan (condensing fan) 3 with the in-vehicle air conditioning system. The battery thermal management system further includes: the battery cooling evaporator 11 and the thermal management throttle 6 (specifically, a valve-closed no-flow throttle, which is used for throttling and/or adjusting the flow, such as an electronic expansion valve) are used for evaporating the refrigerant in the battery cooling evaporator 11 (specifically, a plate heat exchanger) to cool the battery cooling liquid, and the thermal management electronic expansion valve 6 is used for adjusting the flow of the refrigerant. The coolant circuit of the battery thermal management system comprises: a water pump 12, battery heat exchange cold plates 13, and an expansion tank 10 for storing the coolant and maintaining the coolant circuit pressure. The air conditioning system and the thermal management system in the vehicle share the compressor 1, the condenser 4 and the condensing fan 3. The outlet of the condenser 4 is divided into two branches in parallel connection, the in-vehicle evaporator 7 and the air-conditioning electronic expansion valve 5 form a first branch, the thermal management electronic expansion valve 6 and the battery cooling evaporator 11 form a second branch, and the two branches are in the turn of the inlet pipe of the gas-liquid separator 9; a temperature sensor (the temperature of the outlet of the evaporator in the vehicle) is arranged in front of the outlet of the evaporator in the first branch and the convergence point of the first branch and the second branch; a temperature sensor (temperature of the plate heat exchanger inlet) is arranged between the second branch heat management electronic expansion valve and the plate heat exchanger inlet, and a temperature sensor (temperature of the battery cooling evaporator 11 outlet) is arranged in front of the second branch plate heat exchanger outlet and the convergence points of the first branch and the second branch. Temperature sensors (the water inlet temperature of the battery cooling evaporator 11 and the water outlet temperature of the battery cooling evaporator 11) are respectively arranged at the inlet and the outlet of the coolant loop plate type heat exchanger.

When the temperature of the battery is not high, the battery thermal management system is not required to be started, and only the refrigerating or heating requirement in the carriage is required to be responded, and at the moment, the thermal management throttle valve can be closed; when the vehicle is stopped and charged, the battery needs to be cooled, the battery thermal management system needs to be started, and the interior of the carriage does not need to be refrigerated or heated, so that the air conditioner throttle valve in the vehicle can be closed. When the vehicle air conditioning system is independently operated, the electronic expansion valve is thermally managed to 0B by adjusting (a thermal management throttle valve between a condenser and a battery cooling evaporator), so that the flow of the refrigerant entering the battery cooling evaporator is closed; when the battery thermal management system is operated alone, the flow of the refrigerant circuit entering the in-vehicle air conditioner evaporator is closed by adjusting the in-vehicle air conditioner electronic expansion valve (in-vehicle air conditioner throttle valve between the condenser and the in-vehicle air conditioner evaporator) to 0B. When the air conditioning system and the thermal management system in the vehicle run simultaneously, the flow of the refrigerant entering the evaporator in the vehicle and the flow of the refrigerant entering the battery cooling evaporator are respectively regulated through the air conditioning throttle valve and the thermal management throttle valve in the vehicle.

The flow rate is controlled by adjusting the opening degree of the air conditioner throttle valve and/or the thermal management throttle valve in the vehicle, and the larger the opening degree is, the larger the flow rate is. The throttle valve opening is periodically regulated, the opening of the nth period is the opening of the n-1 th period plus a set opening variation, the set opening variation is calculated according to a PI formula (proportional integral control), and the calculated opening variation is output to the throttle valve to execute the action.

The invention provides a control method of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle, which can be used for controlling the refrigerant flow distribution of the in-vehicle air conditioning system and the battery thermal management system of the electric vehicle. The device can be particularly used for controlling the refrigerant flow of the air-conditioning in-vehicle heat exchanger of the in-vehicle air-conditioning system and the refrigerant flow distribution of the battery cooling heat exchanger of the battery thermal management system. The electric vehicle includes: an in-vehicle air conditioning system and a battery thermal management system.

Fig. 1 is a schematic diagram of a control method of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle according to an embodiment of the present invention. As shown in fig. 1, the control method of the in-vehicle air conditioning system and the battery thermal management system of the vehicle provided by the invention at least comprises step S110, step S120 and step S130.

Step S110, obtaining a first set temperature of the in-vehicle air conditioning system and an in-vehicle temperature of the vehicle, so as to determine a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature.

In one embodiment, the capacity requirement of the in-vehicle air conditioning system is characterized by the difference between the actual temperature value of the usage environment (in-vehicle temperature) and the set in-vehicle target temperature value (first set temperature). That is, the different in-vehicle temperatures and the difference between the first set temperatures correspond to different capacity requirements, for example, the capacity requirements are divided into four gradients of 0%, 50%, 100% and 120%, and the larger the value is, the larger the difference between the actual in-vehicle temperature value and the set in-vehicle target temperature value is, the larger the required refrigerating capacity is, the larger the refrigerating capacity requirement is, and the larger the relative refrigerant flow requirement is. For example, in the cooling mode, the user sets a temperature of 26 ℃, and if the temperature in the vehicle is 25 ℃ at this time and the user's requirements have been exceeded, the capacity requirement is 0%; if the temperature in the vehicle is 25.5 ℃, the temperature reaches 26 ℃ required by the user, and the capacity requirement is 50%; if the temperature in the automobile is 26 ℃, the requirement of a user is just met, and the capacity requirement is 100%; if the temperature in the vehicle is 27 ℃, the temperature does not reach 26 ℃ required by users yet, and the capacity requirement is 120%.

Step S120, obtaining a cooling liquid temperature of a battery cooling heat exchanger of the battery thermal management system and a second set temperature of the battery thermal management system, and determining a capacity requirement (i.e., a battery cooling capacity requirement) of the battery thermal management system according to the cooling liquid temperature and the second set temperature.

The temperature of the cooling liquid of the battery cooling heat exchanger can be the temperature of the cooling liquid at the inlet of the battery cooling heat exchanger or the temperature of the cooling liquid at the outlet of the battery cooling heat exchanger, and compared with the temperature of the cooling liquid at the outlet of the battery cooling heat exchanger (namely the temperature of the cooling liquid at the inlet of the battery cooling plate), the temperature of the cooling liquid at the outlet of the battery cooling heat exchanger is used for participating in control, so that the response period of the system is shorter, and the control is more direct and reliable.

In one embodiment, the capacity demand of the battery thermal management system is characterized by the difference between the actual temperature value of the coolant (coolant temperature) of the battery cooling heat exchanger and the set coolant target temperature value (second set temperature). That is, the difference between the different coolant temperatures and the second set temperature corresponds to different capacity requirements. For example, similar to the capacity requirement of an air conditioning system in a vehicle, the capacity requirement of the battery thermal management system may be divided into four gradients of 0%, 50%, 100% and 120%, wherein the larger the value is, the larger the difference between the actual temperature value of the cooling liquid and the set target temperature value of the cooling liquid is, the larger the required refrigerating capacity is, the larger the cooling capacity requirement is, and the larger the relative refrigerant flow requirement is.

And step S130, controlling the opening degree of a thermal management throttle valve of the battery thermal management system and/or controlling the frequency of a compressor of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system.

In one specific embodiment, controlling the opening of the thermal management throttle of the battery thermal management system according to the determined capacity requirement of the in-vehicle air conditioning system and the determined capacity requirement of the battery thermal management system includes: determining a target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system; and controlling the opening degree of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of a battery cooling heat exchanger of the battery thermal management system and the target superheat degree.

In one embodiment, determining the target superheat of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system comprises: and determining the target superheat degree of the battery cooling heat exchanger by utilizing the preset corresponding relation between the combination of the capability requirements of different in-vehicle air conditioning systems and the capability requirements of different battery thermal management systems and the target superheat degree according to the capability requirements of the in-vehicle air conditioning systems and the capability requirements of the battery thermal management systems. For example, under different combinations of different in-vehicle air conditioning capacity demands and different battery thermal management system capacity demands, the superheat degree of the battery cooling heat exchanger when the overall energy efficiency is optimal is tested through experiments, namely, the target superheat degree (namely, the optimal value of the target superheat degree) under the corresponding capacity demand combination is determined, the target superheat degree under all capacity combinations is obtained, the corresponding relation between the combination of different in-vehicle air conditioning capacity demands and different battery cooling system capacity demands and the target superheat degree is formed, and the target superheat degree of the battery cooling heat exchanger is determined according to the corresponding relation.

In one specific embodiment, controlling the opening of the thermal management throttle valve of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree includes: determining the opening variable quantity of a thermal management throttle valve of the next control period of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree; and controlling the opening degree of the thermal management throttle valve according to the determined opening degree variation of the thermal management throttle valve of the battery thermal management system.

Specifically, the refrigerant inlet temperature and the refrigerant outlet temperature of the battery cooling heat exchanger are detected, and the actual superheat degree of the battery cooling heat exchanger is calculated according to the refrigerant inlet temperature and the refrigerant outlet temperature. The superheat degree of the battery cooling heat exchanger is equal to the difference value between the refrigerant outlet temperature and the refrigerant inlet temperature. The temperature sensor at the outlet of the battery cooling heat exchanger can be used for detecting the temperature of the refrigerant outlet of the battery cooling heat exchanger, and the temperature sensor at the inlet of the battery cooling heat exchanger is used for detecting the temperature of the refrigerant inlet of the battery cooling heat exchanger. And calculating the opening variable quantity of the thermal management throttle valve of the next control period of the battery thermal management system through a PI control algorithm according to the determined target superheat degree of the battery cooling heat exchanger and the determined actual superheat degree of the battery cooling heat exchanger, so as to control the opening of the thermal management throttle valve according to the determined opening variable quantity of the thermal management throttle valve of the battery thermal management system.

In one embodiment, controlling the compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system comprises: determining an upper limit value of a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle; and controlling the compressor frequency of the in-vehicle air conditioning system according to the determined upper limit value of the compressor frequency of the in-vehicle air conditioning system.

Specifically, according to the capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle, the corresponding relation between the combination of the capacity requirement of different in-vehicle air conditioning systems and the capacity requirement of different battery thermal management systems under different preset environment temperature intervals and the compressor frequency upper limit value is utilized to determine the compressor frequency upper limit value of the in-vehicle air conditioning system. For example, under different combinations of different in-vehicle air conditioning capacity demands and different battery thermal management system capacity demands in different environmental temperature intervals, the compressor frequency when the system capacity is met and the energy consumption is optimal is determined to be the upper limit value of the compressor frequency under the corresponding capacity demand combination, the upper limit value of the compressor frequency under all capacity combinations is obtained, the corresponding relation between the combinations of different in-vehicle air conditioning capacity demands and different battery cooling system capacity demands and the upper limit value of the compressor frequency is formed, and the upper limit value of the compressor frequency of the in-vehicle air conditioning system is determined according to the corresponding relation.

After the upper limit value of the compressor frequency of the air conditioning system in the vehicle is determined, the compressor frequency of the air conditioning system in the vehicle is controlled according to the determined upper limit value of the compressor frequency, so that the accurate control of the upper limit of the compressor frequency is realized, the frequent start and stop of the air conditioner caused by the high-frequency operation of the compressor are avoided, the energy consumption is high, and the stability of the temperature in the vehicle and the required temperature of the battery cooling liquid is also ensured.

Fig. 3 is a schematic diagram of a method of another embodiment of a control method of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle according to the present invention. As shown in fig. 3, according to an embodiment of the present invention, the refrigerant flow distribution control method further includes step S102, step S104, and step S106.

Step S102, when the in-vehicle air conditioning system and the battery thermal management system are simultaneously operated, obtaining the superheat degree of a battery cooling heat exchanger of the battery thermal management system, and obtaining the superheat degree of an air-conditioning in-vehicle heat exchanger of the in-vehicle air conditioning system.

When the in-vehicle air conditioning system and the battery thermal management system are simultaneously operated, acquiring the superheat degree of a battery cooling heat exchanger of the battery thermal management system and acquiring the superheat degree of an air-conditioning in-vehicle heat exchanger of the in-vehicle air conditioning system before controlling the opening degree of a thermal management throttle valve of the battery thermal management system and/or controlling the compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system.

Specifically, the refrigerant outlet temperature and the refrigerant inlet temperature of the battery cooling heat exchanger of the battery thermal management system are obtained, and the superheat degree of the battery cooling heat exchanger is determined according to the difference value between the refrigerant outlet temperature and the refrigerant inlet temperature. The superheat degree of the battery cooling heat exchanger is equal to the difference value between the refrigerant outlet temperature and the refrigerant inlet temperature. Optionally, the temperature sensor at the outlet of the battery cooling heat exchanger is used for detecting the temperature of the refrigerant outlet of the battery cooling heat exchanger, and the temperature sensor at the inlet of the battery cooling heat exchanger is used for detecting the temperature of the refrigerant inlet of the battery cooling heat exchanger.

And acquiring the refrigerant outlet temperature and the refrigerant inlet temperature of the air-conditioning in-vehicle heat exchanger of the in-vehicle air-conditioning system, and determining the superheat degree of the in-vehicle heat exchanger of the air-conditioning according to the difference value of the refrigerant outlet temperature and the refrigerant inlet temperature. The superheat degree of the heat exchanger in the air conditioner vehicle is equal to the difference value between the refrigerant outlet temperature and the refrigerant inlet temperature. Optionally, the temperature sensor at the outlet of the heat exchanger in the air conditioner vehicle detects the temperature of the refrigerant outlet of the heat exchanger in the air conditioner vehicle, and the temperature sensor at the inlet of the heat exchanger in the air conditioner vehicle detects the temperature of the refrigerant inlet of the heat exchanger in the air conditioner vehicle.

Step S104, determining a first opening variable quantity of a thermal management throttle valve of a next control period of the battery thermal management system according to the obtained superheat degree of the battery cooling heat exchanger; and determining a second opening variable quantity of an in-vehicle air conditioning throttle valve of the next control period of the in-vehicle air conditioning system according to the obtained superheat degree of the in-vehicle air conditioning system.

And calculating the opening variable quantity of the thermal management throttle valve of the next control period of the battery thermal management system through a PI control algorithm according to the obtained superheat degree of the battery cooling heat exchanger and the preset target superheat degree of the battery cooling heat exchanger. And calculating the opening variable quantity of the air conditioner in the vehicle in the next control period of the air conditioning system through a PI control algorithm according to the obtained superheat degree of the heat exchanger in the air conditioner in the vehicle and the preset target superheat degree of the heat exchanger in the air conditioner in the vehicle.

Taking refrigeration as an example, defining a variable e=current actual superheat degree-target superheat degree, acquiring and calculating an e value every 30s, and calculating the variation of e in two adjacent periods, wherein the variation is defined as delta e, delta e=e (n) -e (n-1), and n-1 represent an nth period and an nth-1 period; opening degree variation

Wherein A, B is a constant, A is a proportional control coefficient, B is an integral control coefficient, and the proportional control coefficient is obtained according to experimental verification.

Because the pressure drop of the plate heat exchanger is far smaller than that of the in-vehicle evaporator, the detected temperature of the plate heat exchanger inlet temperature sensor actually measures the saturation temperature difference of 1-2 ℃ corresponding to the pressure of the in-vehicle evaporator, and the plate heat exchanger inlet temperature sensor can replace the evaporation temperature of the in-vehicle evaporator. The evaporator temperature of the evaporator in the refrigeration equipment is usually detected by a low-pressure sensor arranged on the evaporator, and then the saturation temperature corresponding to the evaporation pressure is detected as the evaporation temperature according to the physical property of the refrigerant. The temperature detected by the plate heat exchanger inlet temperature sensor is directly used for replacing the evaporation temperature, so that the use of one pressure sensor can be reduced, and the cost can be saved.

And step S106, controlling the opening of the thermal management throttle valve according to the determined first opening variation, and controlling the opening of the in-vehicle air-conditioning throttle valve according to the determined second opening variation.

Specifically, the controller controls the thermal management throttle valve to execute corresponding opening change according to the first opening change amount, and controls the in-vehicle air conditioning throttle valve to execute corresponding opening change according to the second opening change amount. The flow rate is controlled by adjusting the opening degree of the air conditioner throttle valve and/or the thermal management throttle valve in the vehicle, and the larger the opening degree is, the larger the flow rate is. The opening of the air-conditioning throttle valve and/or the thermal management throttle valve in the vehicle is periodically adjusted, the opening of the nth period is the opening of the n-1 th period plus a set opening variation, the set opening variation is calculated according to a PI control formula (proportional integral control), and the calculated opening variation is output to the air-conditioning throttle valve and/or the thermal management throttle valve to execute actions.

Alternatively, step S102, step S104 and step S106 may be performed before step S110, that is, when the in-vehicle air conditioning system and the battery thermal management system are simultaneously operated, the control is performed based on the degree of superheat, and then the control is performed in combination with the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system.

In order to clearly illustrate the technical scheme of the invention, the following describes the execution flow of the control method of the in-vehicle air conditioning system and the battery thermal management system of the vehicle according to some specific embodiments.

When the battery thermal management system and the in-vehicle air conditioning system of the vehicle run simultaneously, the capacity requirement of the in-vehicle air conditioning system is coupled with the capacity requirement of the battery thermal management system, and the target superheat degree is adjusted by controlling the opening degree of the thermal management electronic expansion valve. The refrigerant flowing out of the heat exchanger (condenser) outside the vehicle enters the heat exchanger (first branch) and the battery cooling heat exchanger (second branch) inside the air conditioner vehicle respectively, the two branches control the distribution of the refrigerant flow through the opening degree of the air conditioner throttle valve (for example, an electronic expansion valve) and the opening degree of the thermal management throttle valve (for example, an electronic expansion valve) respectively, and the control of the opening degree variation of the throttle valve is calculated by the actual superheat degree and the target superheat degree.

Fig. 4 is a schematic diagram of a method for controlling an in-vehicle air conditioning system and a battery thermal management system of a vehicle according to an embodiment of the present invention. As shown in fig. 4, in the cooling mode, after the in-vehicle air conditioning system and the battery thermal management system operate for a period of time (for example, several minutes), the in-vehicle air conditioning system enters a throttle opening PI control (proportional integral control) stage, a first set temperature and an in-vehicle temperature of the in-vehicle air conditioning system are detected, and a capacity requirement of the in-vehicle air conditioning system is determined according to the first set temperature and the in-vehicle temperature; the method comprises the steps of detecting the cooling liquid temperature of a battery cooling heat exchanger and a second set temperature of a battery thermal management system, and determining the capacity requirement (namely the battery cooling capacity requirement) of the thermal management system according to the cooling liquid temperature and the second set temperature. And determining the target superheat degree of the battery cooling heat exchanger according to the capacity requirement of the air conditioning system in the vehicle and the capacity requirement of the battery thermal management system, detecting the refrigerant inlet temperature and the refrigerant outlet temperature of the battery cooling heat exchanger, and calculating the actual superheat degree of the battery cooling heat exchanger according to the refrigerant inlet temperature and the refrigerant outlet temperature. And performing PI calculation on the opening variation of the thermal management throttle valve according to the actual superheat degree and the target superheat degree of the battery cooling heat exchanger, and controlling the opening of the thermal management throttle valve according to the opening variation.

When the in-vehicle air conditioning system and the battery thermal management system are operated simultaneously, the independent thermal management cold quantity requirement has wide variation range, and the opening degree of the thermal management electronic expansion valve needs to be finely adjusted. Therefore, the target superheat degree of the plate heat exchanger is reasonably set, and the capacity requirement of the battery heat management system and the capacity requirement of the in-vehicle air conditioning system are simultaneously distributed. Based on experimental actual measurement data, the air conditioning capacity requirement and the battery thermal management capacity requirement in the vehicle are coupled, and different target superheat values of the thermal management plate heat exchanger under different vehicle capacity requirements and battery cooling requirements are given.

In the refrigeration mode, the in-vehicle air conditioning system sets the upper limit of the compressor frequency in different in-vehicle external environment temperature intervals so as to prevent the compressor from running at high frequency, and the refrigerating capacity is output excessively, so that the compressor is started and stopped frequently, the energy consumption of the air conditioner is high, and the comfort of the in-vehicle temperature (the in-vehicle temperature fluctuation is large) can be influenced. The capacity requirement is a gap between the actual requirement temperature and a customer expected value, and for the integrated battery water-cooled passenger car air conditioner, the capacity requirement of an in-car air conditioning system and the demand of a battery thermal management system are coupled into the upper limit control of the compressor frequency, so that the upper limit division of a compressor frequency table is facilitated to be refined, and the output capacity and the power consumption of the air conditioner are accurately controlled.

Fig. 5 is a schematic diagram of a method of another embodiment of a control method of an in-vehicle air conditioning system and a battery thermal management system of a vehicle according to the present invention. As shown in fig. 5, in the cooling mode, detecting a first set temperature and an in-vehicle temperature of an in-vehicle air conditioning system, and determining a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature; the coolant temperature of the battery cooling heat exchanger and a second set temperature of the battery cooling system are detected, and a capacity demand (i.e., battery cooling capacity demand) of the thermal management system is determined based on the coolant temperature and the second set temperature. Determining an upper limit value of the frequency of a compressor of the air conditioning system in the vehicle according to the determined capacity requirement of the air conditioning system in the vehicle, the capacity requirement of a thermal management system and the temperature range of the outside environment temperature of the vehicle in more than two preset temperature ranges; and controlling the compressor frequency of the in-vehicle air conditioning system according to the determined upper limit value of the compressor frequency of the in-vehicle air conditioning system.

The invention also provides a control device of the in-vehicle air conditioning system and the battery thermal management system of the electric vehicle, which can be used for controlling the refrigerant flow distribution of the in-vehicle air conditioning system and the battery thermal management system of the electric vehicle. The device can be particularly used for controlling the refrigerant flow of the air-conditioning in-vehicle heat exchanger of the in-vehicle air-conditioning system and the refrigerant flow distribution of the battery cooling heat exchanger of the battery thermal management system. The electric vehicle includes: an in-vehicle air conditioning system and a battery thermal management system.

Fig. 6 is a block diagram illustrating an embodiment of a control apparatus for an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle according to the present invention. As shown in fig. 6, the control device 100 includes a first determination unit 110, a second determination unit 120, and a first control unit 130.

The first determining unit 110 is configured to obtain a first set temperature of the in-vehicle air conditioning system and an in-vehicle temperature of the vehicle, so as to determine a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature.

The second determining unit 120 is configured to obtain a coolant temperature of the battery cooling heat exchanger and a second set temperature of the battery thermal management system, and determine a capacity requirement of the battery thermal management system according to the coolant temperature and the second set temperature.

In one embodiment, the capacity demand of the battery thermal management system is characterized by the difference between the actual temperature value of the coolant (coolant temperature) of the battery cooling heat exchanger and the set coolant target temperature value (second set temperature). That is, the difference between the different coolant temperatures and the second set temperature corresponds to different capacity requirements. For example, similar to the capacity requirement of an air conditioning system in a vehicle, the capacity requirement of the battery thermal management system can be divided into four gradients of 0%, 50%, 100% and 120%, wherein the larger the value is, the larger the difference between the actual temperature value of the cooling liquid and the set target temperature value of the cooling liquid is, the larger the required refrigerating capacity is, the larger the refrigerating capacity requirement is, and the larger the relative refrigerant flow requirement is.

The first control unit 130 is configured to control an opening degree of a thermal management throttle valve of the battery thermal management system and/or control a compressor frequency of the in-vehicle air conditioning system according to the capacity requirement of the in-vehicle air conditioning system determined by the first determination unit and the capacity requirement of the battery thermal management system determined by the second determination unit.

In one specific embodiment, the first control unit controls the opening degree of the thermal management throttle of the battery thermal management system according to the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system determined by the first determination unit, and includes: determining a target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system; and controlling the opening degree of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of a battery cooling heat exchanger of the battery thermal management system and the target superheat degree.

In one embodiment, the first control unit 130 determines the target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, including: and determining the target superheat degree of the battery cooling heat exchanger by utilizing the preset corresponding relation between the combination of the capability requirements of different in-vehicle air conditioning systems and the capability requirements of different battery thermal management systems and the target superheat degree according to the capability requirements of the in-vehicle air conditioning systems and the capability requirements of the battery thermal management systems. For example, under different combinations of different in-vehicle air conditioning capacity demands and different battery thermal management system capacity demands, the superheat degree of the battery cooling heat exchanger when the overall energy efficiency is optimal is tested through experiments, namely, the target superheat degree (namely, the optimal value of the target superheat degree) under the corresponding capacity demand combination is determined, the target superheat degree under all capacity combinations is obtained, the corresponding relation between the combination of different in-vehicle air conditioning capacity demands and different battery cooling system capacity demands and the target superheat degree is formed, and the target superheat degree of the battery cooling heat exchanger is determined according to the corresponding relation.

In one specific embodiment, the first control unit 130 controls the opening degree of the thermal management throttle valve of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree, and includes: determining the opening variable quantity of a thermal management throttle valve of the next control period of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree; and controlling the opening degree of the thermal management throttle valve according to the determined opening degree variation of the thermal management throttle valve of the battery thermal management system.

In one embodiment, the first control unit 130 controls the compressor frequency of the in-vehicle air conditioning system according to the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system determined by the second determining unit, and includes: determining an upper limit value of a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle; and controlling the compressor frequency of the in-vehicle air conditioning system according to the determined upper limit value of the compressor frequency of the in-vehicle air conditioning system.

Fig. 7 is a block diagram illustrating another embodiment of a control apparatus for an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle according to the present invention. As shown in fig. 7, the control apparatus 100 includes an acquisition unit 102, a third determination unit 104, and a second control unit 106.

The obtaining unit 102 is configured to obtain a degree of superheat of a battery cooling heat exchanger of the battery thermal management system and a degree of superheat of an air-conditioning in-vehicle heat exchanger of the in-vehicle air conditioning system when the in-vehicle air conditioning system and the battery thermal management system are simultaneously operated.

The third determining unit 104 is configured to determine, according to the degree of superheat of the battery cooling heat exchanger acquired by the acquiring unit 102, a first opening change amount of a thermal management throttle valve in a next control period of the battery thermal management system, and determine, according to the degree of superheat of the in-vehicle air conditioning system acquired by the acquiring unit, a second opening change amount of an in-vehicle air conditioning throttle valve in the next control period of the in-vehicle air conditioning system.

The second control unit 104 is configured to control an opening degree of the thermal management throttle according to the first opening degree variation determined by the third determination unit, and to control an opening degree of the in-vehicle air-conditioning throttle according to the second opening degree variation determined by the third determination unit.

Alternatively, the above-described operations performed by the acquisition unit 102, the third determination unit 104, and the second control unit 106 may be performed before the respective operations performed by the first determination unit 110, the second determination unit 120, and the first control unit 130, that is, when the in-vehicle air conditioning system and the battery thermal management system are simultaneously operated, the individual control is performed based on the degree of superheat, and then the control is performed in combination with the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system.

The present invention also provides a computer-readable storage medium corresponding to a control method of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle, having stored thereon a computer program which, when executed by a processor, implements the steps of any of the methods described above.

The invention also provides an electric vehicle corresponding to the control method of the in-vehicle air conditioning system and the battery thermal management system of the electric vehicle, comprising a processor, a memory and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of any one of the methods.

The invention also provides an electric vehicle corresponding to the control device of the in-vehicle air conditioning system and the battery thermal management system of the electric vehicle, which comprises the control device of the in-vehicle air conditioning system and the battery thermal management system of any one of the electric vehicles.

Accordingly, the scheme provided by the invention is based on the capacity requirement of the air conditioner in the vehicle and the requirement of the battery cooling in the vehicle, the flow distribution of the heat exchanger in the vehicle and the battery cooling heat exchanger is finely controlled, and the shortage or the surplus of the supply of the cooling capacity of the air conditioner in the vehicle and the battery cooling capacity caused by the difference of the flow distribution is avoided; coupling an in-vehicle air conditioning capacity requirement with a battery cooling in-vehicle environment requirement and an in-vehicle environment temperature; the upper limit of the compressor frequency is finely controlled, and adverse effects of frequent shutdown of the compressor, high system power consumption, excessive cold and the like caused by excessive system capacity due to the fact that the upper limit of the compressor frequency is not correspondingly adjusted when the capacity requirement of the system changes are avoided.

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit.

In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate components may or may not be physically separate, and components as control devices may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the related art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A control method of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle, characterized in that the vehicle includes: the control method comprises the following steps of:

acquiring a first set temperature of the in-vehicle air conditioning system and an in-vehicle temperature of the vehicle to determine a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature;

acquiring the temperature of cooling liquid of a battery cooling heat exchanger of the battery thermal management system and a second set temperature of the battery thermal management system, and determining the capacity requirement of the battery thermal management system according to the temperature of the cooling liquid and the second set temperature;

controlling the opening degree of a thermal management throttle valve of the battery thermal management system and/or controlling the frequency of a compressor of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system;

When the in-vehicle air conditioning system and the battery thermal management system run simultaneously, acquiring the superheat degree of a battery cooling heat exchanger of the battery thermal management system and acquiring the superheat degree of an air conditioning in-vehicle heat exchanger of the in-vehicle air conditioning system;

determining a first opening variable quantity of a thermal management throttle valve of a next control period of the battery thermal management system according to the obtained superheat degree of the battery cooling heat exchanger, and determining a second opening variable quantity of an air conditioning throttle valve of the next control period of the in-vehicle air conditioning system according to the obtained superheat degree of the in-vehicle air conditioning system;

and controlling the opening of the thermal management throttle according to the determined first opening variation, and controlling the opening of the in-vehicle air-conditioning throttle according to the determined second opening variation.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, controlling the opening degree of a thermal management throttle valve of the battery thermal management system comprises the following steps:

determining a target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system;

Controlling the opening degree of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of a battery cooling heat exchanger of the battery thermal management system and the target superheat degree;

and/or the number of the groups of groups,

controlling a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, comprising:

determining an upper limit value of a compressor frequency of the in-vehicle air conditioning system according to the determined capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle;

and controlling the compressor frequency of the in-vehicle air conditioning system according to the determined upper limit value of the compressor frequency of the in-vehicle air conditioning system.

3. The method of claim 2, wherein the step of determining the position of the substrate comprises,

determining a target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, comprising:

determining the target superheat degree of the battery cooling heat exchanger by utilizing the preset corresponding relation between the combination of the capability requirements of different in-vehicle air conditioning systems and the capability requirements of different battery thermal management systems and the target superheat degree according to the capability requirements of the in-vehicle air conditioning systems and the capability requirements of the battery thermal management systems;

And/or the number of the groups of groups,

according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree, controlling the opening degree of a thermal management throttle valve of the battery thermal management system, comprising:

determining the opening variable quantity of a thermal management throttle valve of the next control period of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree;

and controlling the opening degree of the thermal management throttle valve according to the determined opening degree variation of the thermal management throttle valve of the battery thermal management system.

4. The method of claim 2, wherein determining the upper limit compressor frequency of the in-vehicle air conditioning system based on the determined capacity demand of the in-vehicle air conditioning system, the capacity demand of the battery thermal management system, and the temperature of the outside environment of the vehicle comprises:

and determining the upper limit value of the compressor frequency of the in-vehicle air conditioning system according to the capacity requirement of the in-vehicle air conditioning system, the capacity requirement of the battery thermal management system and the in-vehicle environment temperature of the vehicle by utilizing the corresponding relation between the combination of the capacity requirement of different in-vehicle air conditioning systems and the capacity requirement of different battery thermal management systems under preset different environment temperature intervals and the upper limit value of the compressor frequency.

5. A control device of an in-vehicle air conditioning system and a battery thermal management system of an electric vehicle, characterized in that the vehicle includes: an in-vehicle air conditioning system and a battery thermal management system, the control device comprising:

a first determining unit, configured to obtain a first set temperature of the in-vehicle air conditioning system and an in-vehicle temperature of the vehicle, so as to determine a capacity requirement of the in-vehicle air conditioning system according to the first set temperature and the in-vehicle temperature;

a second determining unit, configured to obtain a cooling liquid temperature of a battery cooling heat exchanger of the battery thermal management system and a second set temperature of the battery thermal management system, and determine a capacity requirement of the battery thermal management system according to the cooling liquid temperature and the second set temperature;

a first control unit configured to control an opening degree of a thermal management throttle valve of the battery thermal management system and/or control a compressor frequency of the in-vehicle air conditioning system according to the capacity demand of the in-vehicle air conditioning system determined by the first determination unit and the capacity demand of the battery thermal management system determined by the second determination unit;

further comprises:

the device comprises an acquisition unit, a battery heat management system and a control unit, wherein the acquisition unit is used for acquiring the superheat degree of a battery cooling heat exchanger of the battery heat management system and the superheat degree of an air-conditioning vehicle heat exchanger of the vehicle air-conditioning system when the vehicle air-conditioning system and the battery heat management system are simultaneously operated;

A third determining unit, configured to determine a first opening variation of a thermal management throttle valve in a next control period of the battery thermal management system according to the degree of superheat of the battery cooling heat exchanger acquired by the acquiring unit, and determine a second opening variation of an in-vehicle air conditioning throttle valve in the next control period of the in-vehicle air conditioning system according to the degree of superheat of the in-vehicle air conditioning system acquired by the acquiring unit;

a second control unit configured to control an opening degree of the thermal management throttle valve in accordance with the first opening degree variation determined by the third determination unit, and to control an opening degree of the in-vehicle air-conditioning throttle valve in accordance with the second opening degree variation determined by the third determination unit.

6. The control device according to claim 5, wherein,

the first control unit controls the opening degree of a thermal management throttle valve of the battery thermal management system according to the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system determined by the first determination unit, and the first control unit comprises:

and/or the number of the groups of groups,

the first control unit controls the compressor frequency of the in-vehicle air conditioning system according to the capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system determined by the second determination unit, and comprises:

7. The control device according to claim 6, wherein,

the first control unit determines a target superheat degree of the battery cooling heat exchanger according to the determined capacity requirement of the in-vehicle air conditioning system and the capacity requirement of the battery thermal management system, and includes:

And/or the number of the groups of groups,

the first control unit controls the opening of a thermal management throttle valve of the battery thermal management system according to the actual superheat degree of the battery cooling heat exchanger and the target superheat degree, and includes:

8. A computer readable storage medium, characterized in that a computer program is stored thereon, which program, when being executed by a processor, implements the steps of the method according to any of claims 1-4.

9. An electric vehicle comprising a processor, a memory and a computer program stored on the memory and executable on the processor, when executing the program, implementing the steps of the method of any one of claims 1-4, comprising the control device of the in-vehicle air conditioning system and the battery thermal management system of any one of claims 5-7.