Air conditioning system of pure electric bus and control method, device and storage medium thereof

Abstract

This invention discloses a control method, device, integrated liquid-cooled air conditioning system for a pure electric bus, and a storage medium. The method includes: controlling the operation mode of the integrated liquid-cooled air conditioning system after startup; acquiring the current cooling demand of the integrated liquid-cooled air conditioning system, the outlet water temperature of the plate heat exchanger, and the battery temperature; determining the current operating mode of the integrated liquid-cooled air conditioning system based on the current cooling demand; and controlling the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system, and adjusting the opening degree of the air conditioning flow control unit and the battery throttling unit, based on the current operating mode and in conjunction with the outlet water temperature of the plate heat exchanger and / or the battery temperature. This solution achieves rapid and effective cooling of the battery of the pure electric bus by adjusting the operation of the air conditioning electronic expansion valve and the battery electronic expansion valve according to the demand signal of the battery cooling system.

Description

Technical Field

[0001] This invention belongs to the technical field of air conditioning systems for pure electric buses, specifically relating to a control method, device, integrated liquid-cooled air conditioning system and storage medium for a pure electric bus, and particularly to a method, device, integrated liquid-cooled air conditioning system and storage medium for controlling rapid cooling of a battery in an integrated liquid-cooled air conditioning system for a pure electric bus. Background Technology

[0002] With changes in the international energy environment and national policies, pure electric buses are developing rapidly. To adapt to relevant national policies and the actual needs of users, pure electric buses generally have fast charging capabilities. However, fast charging and operation of pure electric buses generate a large amount of heat, which poses potential safety hazards and shortens the lifespan of the batteries. Therefore, to ensure the normal operating environment and lifespan of the batteries in pure electric buses, rapid and effective cooling is necessary.

[0003] In related solutions, most pure electric bus manufacturers adopt integrated thermal management air conditioning (i.e., integrated liquid-cooled air conditioning system), which integrates the air conditioning system and the battery liquid cooling system into one unit. In this integrated thermal management air conditioning system, the air conditioning system and the battery liquid cooling system are switched via two valve-closed, flow-free electronic expansion valves (i.e., electronic fully closed valve expansion valves). The valve-closed, flow-free electronic expansion valve refers to an electronic expansion valve that allows no flow when the valve is closed. However, the battery cooling system (i.e., the air conditioning system and the battery liquid cooling system) of the integrated thermal management air conditioning system cannot quickly and effectively cool the battery of the pure electric bus.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a control method, device, integrated liquid-cooled air conditioning system for a pure electric bus, and a storage medium to solve the problem that the battery cooling system (i.e., the air conditioning system and the battery liquid cooling system) of the integrated liquid-cooled air conditioning system (i.e., an integrated thermal management air conditioning system that integrates the air conditioning system and the battery liquid cooling system) of a pure electric bus cannot quickly and effectively cool the battery of the pure electric bus. This invention achieves the effect of quickly and effectively cooling the battery of the pure electric bus by adjusting the operation of the air conditioning electronic expansion valve and the battery electronic expansion valve in the integrated liquid-cooled air conditioning system according to the demand signal of the battery cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus.

[0006] This invention provides a control method for an integrated liquid-cooled air conditioning system in a pure electric bus. The integrated liquid-cooled air conditioning system includes: a compressor, an external heat exchange unit, an internal heat exchange unit, an air conditioning flow control unit, a battery throttling unit, and a plate heat exchanger, as well as an external fan installed at the external heat exchange unit. The plate heat exchanger has a first heat exchange pipe and a second heat exchange pipe capable of exchanging heat with each other. The compressor's exhaust port is divided into two paths after passing through the external heat exchange unit: one path returns to the compressor's intake port after passing through the air conditioning flow control unit and the internal heat exchange unit, and the other path returns to the compressor's intake port after passing through the battery throttling unit and the first heat exchange pipe of the plate heat exchanger. The second heat exchange pipe of the plate heat exchanger can exchange heat with the battery of the pure electric bus. The compressor, the external heat exchange unit, and the external fan are collectively used in the air conditioning system of the integrated liquid-cooled air conditioning system of the pure electric bus. The integrated liquid-cooled air conditioning system of the pure electric bus is controlled by the following methods: after the integrated liquid-cooled air conditioning system of the pure electric bus is turned on, controlling the operation mode of the integrated liquid-cooled air conditioning system of the pure electric bus to be in cooling mode; obtaining the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus, obtaining the outlet water temperature of the plate heat exchanger, and obtaining the battery temperature of the pure electric bus as the battery temperature of the pure electric bus; determining the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus according to the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus; and controlling the opening and closing of the air conditioning system and the battery liquid-cooled system in the integrated liquid-cooled air conditioning system of the pure electric bus according to the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in combination with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, and adjusting the opening degree of the air conditioning flow control unit and the battery throttling unit.

[0007] In some embodiments, the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is: a first cooling demand when the integrated liquid-cooled air conditioning system of the pure electric bus receives a cooling command, or a second cooling demand when the battery of the pure electric bus is charging or the ambient temperature inside the vehicle is lower than a set temperature; the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a joint cooling mode in which the air conditioning system and the battery liquid cooling system of the integrated liquid-cooled air conditioning system of the pure electric bus work simultaneously, or a separate cooling mode in which the air conditioning system of the integrated liquid-cooled air conditioning system of the pure electric bus is not working and the battery liquid cooling system works alone; according to the pure electric bus The current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is used to determine the current operating mode of the integrated liquid-cooled air conditioning system, including: determining whether the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand or the second cooling demand; if the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand, then the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the common cooling mode; if the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the second cooling demand, then the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the individual cooling mode.

[0008] In some embodiments, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, the on / off state of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus is controlled, and the opening degree of the air conditioning flow control unit and the battery throttling unit is adjusted. This includes: when the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a common cooling mode in which the air conditioning system and the battery liquid cooling system operate simultaneously, controlling the compressor not to start, controlling the outdoor fan to start and run, and controlling the electric... The opening degree of the battery throttling unit is increased to a first set opening degree, and the opening degree of the air conditioning flow control unit is increased to a second set opening degree; wherein, both the first set opening degree and the second set opening degree are within the range of the first set opening degree; after a first set time period, if it is determined that the outlet water temperature of the plate heat exchanger has risen to a first temperature range, and a cooling signal requiring battery cooling is received from the BMS of the pure electric bus battery, then the opening degree of the battery throttling unit is adjusted from the first set opening degree to a third set opening degree; wherein, the third set opening degree is within the range of the second set opening degree; the lower limit of the second set opening degree range is greater than the upper limit of the first set opening degree range.

[0009] In some embodiments, the second set opening range includes a first opening interval, a second opening interval, and a third opening interval. The lower limit of the first opening interval is greater than or equal to the lower limit of the second set opening range, the upper limit of the first opening interval is less than or equal to the lower limit of the second opening interval, the upper limit of the second opening interval is greater than the lower limit of the third opening interval, and the upper limit of the third opening interval is greater than the upper limit of the second opening interval and less than or equal to the upper limit of the second set opening range. Based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, the air conditioning system and battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus are controlled. The system's start-up and shutdown, and adjustment of the opening degree of the air conditioning flow control unit and the battery throttling unit, further include: when the opening degree of the battery throttling unit has risen to the second opening degree range within the second set opening degree range after passing through the first opening degree range, and continues to rise and finally stabilizes at the third opening degree range within the second set opening degree range, after a second set time period, if it is determined that the outlet water temperature of the plate heat exchanger has dropped to the second temperature range, and a non-charging signal from the BMS of the pure electric bus's battery indicating that the battery is not being charged is received, then the opening degree of the battery throttling unit is adjusted from the third set opening degree to the first set opening degree; the upper limit of the second temperature range is less than or equal to the lower limit of the first temperature range.

[0010] In some embodiments, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, the on / off state of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus is controlled, and the opening degree of the air conditioning flow control unit and the battery throttling unit is adjusted. This further includes: when the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a separate cooling mode where the air conditioning system is not working and the battery liquid cooling system is working alone, controlling the opening degree of the battery throttling unit to increase to a fourth preset opening degree, and controlling the air conditioning flow control unit to close; wherein, the fourth preset opening degree is within the range of a third preset opening degree; after a third preset time period, if it is determined that... If the battery temperature of the pure electric bus has risen to the set maximum temperature and a charging signal is received from the battery management system (BMS) indicating that the battery is being charged, then the opening degree of the battery throttling unit is adjusted from the fourth set opening degree to the fifth set opening degree. The fifth set opening degree is within the range of the fourth set opening degree, where the lower limit of the fourth set opening degree range is greater than the lower limit of the third set opening degree range, and the upper limit of the fourth set opening degree range is equal to the upper limit of the third set opening degree range. This adjustment continues until the battery temperature of the pure electric bus drops to the set minimum temperature, and a signal is received from the battery management system indicating that the battery is neither being charged nor cooled. Then, the opening degree of the battery throttling unit is adjusted from the fifth set opening degree to the fourth set opening degree.

[0011] In conjunction with the above method, another aspect of the present invention provides a control device for an integrated liquid-cooled air conditioning system of a pure electric bus. The integrated liquid-cooled air conditioning system of the pure electric bus includes: a compressor, an external heat exchange unit, an internal heat exchange unit, an air conditioning flow control unit, a battery throttling unit, and a plate heat exchanger, as well as an external fan disposed at the external heat exchange unit. The plate heat exchanger has a first heat exchange pipeline and a second heat exchange pipeline capable of exchanging heat with each other. The exhaust port of the compressor is divided into two paths after passing through the external heat exchange unit: one path returns to the compressor's intake port after passing through the air conditioning flow control unit and the internal heat exchange unit, and the other path returns to the compressor's intake port after passing through the battery throttling unit and the first heat exchange pipeline of the plate heat exchanger. The second heat exchange pipeline of the plate heat exchanger is capable of exchanging heat with the battery of the pure electric bus. The compressor, the external heat exchange unit, and the external fan are used together in the air conditioning system and the battery liquid cooling system of the integrated liquid-cooled air conditioning system of the pure electric bus. The control device for the integrated liquid-cooled air conditioning system of the vehicle includes: a control unit configured to control the operation mode of the integrated liquid-cooled air conditioning system of the pure electric bus after the system is turned on; an acquisition unit configured to acquire the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus, acquire the outlet water temperature of the plate heat exchanger, and acquire the battery temperature of the pure electric bus as the battery temperature of the pure electric bus; the control unit is further configured to determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus based on the current cooling demand; the control unit is further configured to control the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in combination with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, and adjust the opening degree of the air conditioning flow control unit and the battery throttling unit.

[0012] In some embodiments, the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is: a first cooling demand when the integrated liquid-cooled air conditioning system of the pure electric bus receives a cooling command, or a second cooling demand when the battery of the pure electric bus is charging or the ambient temperature inside the vehicle is lower than a set temperature; the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a joint cooling mode in which the air conditioning system and the battery liquid cooling system of the integrated liquid-cooled air conditioning system of the pure electric bus work simultaneously, or a separate cooling mode in which the air conditioning system of the integrated liquid-cooled air conditioning system of the pure electric bus is not working and the battery liquid cooling system works alone; the control unit, according to the pure electric bus... The current cooling demand of the integrated liquid-cooled air conditioning system of the electric bus is used to determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, including: determining whether the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand or the second cooling demand; if the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand, then the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the common cooling mode; if the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the second cooling demand, then the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the individual cooling mode.

[0013] In some embodiments, the control unit, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, controls the on / off of the air conditioning system and the battery liquid-cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit, including: when the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a common cooling mode in which the air conditioning system and the battery liquid-cooling system operate simultaneously, controlling the compressor not to start, controlling the outdoor fan to start and run, and controlling... The opening degree of the battery throttling unit is increased to a first set opening degree, and the opening degree of the air conditioning regulating unit is increased to a second set opening degree; wherein, both the first set opening degree and the second set opening degree are within the range of the first set opening degree; after a first set time period, if it is determined that the outlet water temperature of the plate heat exchanger has risen to a first temperature range, and a cooling signal requiring battery cooling is received from the BMS of the pure electric bus battery, then the opening degree of the battery throttling unit is adjusted from the first set opening degree to a third set opening degree; wherein, the third set opening degree is within the range of the second set opening degree; the lower limit of the second set opening degree range is greater than the upper limit of the first set opening degree range.

[0014] In some embodiments, the second set opening range includes a first opening interval, a second opening interval, and a third opening interval. The lower limit of the first opening interval is greater than or equal to the lower limit of the second set opening range, the upper limit of the first opening interval is less than or equal to the lower limit of the second opening interval, the upper limit of the second opening interval is greater than the lower limit of the third opening interval, and the upper limit of the third opening interval is greater than the upper limit of the second opening interval and less than or equal to the upper limit of the second set opening range. The control unit, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, controls the air conditioning system and the electric... The opening and closing of the pool liquid cooling system, and the adjustment of the opening degree of the air conditioning flow control unit and the battery throttling unit, further include: when the opening degree of the battery throttling unit has risen to the second opening degree range within the second set opening degree range after passing through the first opening degree range, and continues to rise and finally stabilizes at the third opening degree range within the second set opening degree range, after a second set time period, if it is determined that the outlet water temperature of the plate heat exchanger has dropped to the second temperature range, and a non-charging signal from the BMS of the pure electric bus battery indicating that the battery is not being charged is received, then the opening degree of the battery throttling unit is adjusted from the third set opening degree to the first set opening degree; the upper limit of the second temperature range is less than or equal to the lower limit of the first temperature range.

[0015] In some embodiments, the control unit, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit. It further includes: when the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a separate cooling mode where the air conditioning system is not working and the battery liquid cooling system is working alone, controlling the opening degree of the battery throttling unit to increase to a fourth preset opening degree, and controlling the air conditioning flow control unit to close; wherein, the fourth preset opening degree is within the range of a third preset opening degree; after a third preset time period, if... If it is determined that the battery temperature of the pure electric bus has risen to a set maximum temperature and a charging signal from the battery management system (BMS) of the pure electric bus indicating that the battery is being charged is received, then the opening degree of the battery throttling unit is adjusted from the fourth set opening degree to the fifth set opening degree; wherein, the fifth set opening degree is within the range of the fourth set opening degree, the lower limit of the fourth set opening degree range is greater than the lower limit of the third set opening degree range, and the upper limit of the fourth set opening degree range is equal to the upper limit of the third set opening degree range; until the battery temperature of the pure electric bus drops to a set minimum temperature and a signal from the battery management system of the pure electric bus indicating that the battery is neither being charged nor cooled is received, then the opening degree of the battery throttling unit is adjusted from the fifth set opening degree to the fourth set opening degree.

[0016] In conjunction with the above-mentioned device, the present invention further provides an integrated liquid-cooled air conditioning system for a pure electric bus, comprising: a control device for the integrated liquid-cooled air conditioning system for a pure electric bus as described above.

[0017] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device containing the storage medium controls the execution of the control method for the integrated liquid-cooled air conditioning system of a pure electric bus described above.

[0018] Therefore, the solution of this invention, through the integrated liquid-cooled air conditioning system for pure electric buses, allows for two modes: a simultaneous start-up mode where the air conditioning and battery of the pure electric bus are activated simultaneously to cool the passenger compartment and the battery, and a separate start-up mode where the battery cools the battery independently. In this mode, the air conditioning system controls the upper and lower limits of the battery electronic expansion valve opening based on the demand signal received from the battery cooling system. This increases the opening of the battery electronic expansion valve, rapidly cooling the battery without affecting the cooling demand of the passenger compartment. Thus, by adjusting the operation of the air conditioning electronic expansion valve and the battery electronic expansion valve in the integrated liquid-cooled air conditioning system according to the demand signal from the battery cooling system, the battery of the pure electric bus is cooled quickly and effectively, ensuring that the battery quickly has a normal operating environment during fast charging and operation.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic flowchart of an embodiment of the control method for the integrated liquid-cooled air conditioning system of a pure electric bus according to the present invention;

[0022] Figure 2 This is a flowchart illustrating an embodiment of the method of the present invention for determining the current operating mode of the integrated liquid-cooled air conditioning system of a pure electric bus.

[0023] Figure 3 This is a schematic flowchart of an embodiment of the method of the present invention, which adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit in the common cooling mode;

[0024] Figure 4 This is a schematic flowchart of an embodiment of the method of the present invention, which adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit in a separate cooling mode;

[0025] Figure 5 This is a schematic diagram of the structure of a control device for an integrated liquid-cooled air conditioning system of a pure electric bus according to an embodiment of the present invention.

[0026] Figure 6 A schematic diagram of an embodiment of an integrated liquid-cooled air conditioning system for a pure electric bus;

[0027] Figure 7This is a schematic flowchart of an embodiment of a method for controlling rapid battery cooling using an integrated liquid-cooled air conditioning system in a pure electric bus according to the present invention.

[0028] Figure 8 This is a schematic diagram of the temperature range in a method for controlling rapid battery cooling using an integrated liquid-cooled air conditioning system for a pure electric bus according to the present invention.

[0029] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0030] 1-Compressor; 2-Outdoor fan; 3-Battery electronic expansion valve; 4-Air conditioning electronic expansion valve; 5-Battery pack; 6-Evaporator; 7-Plate heat exchanger; 8-Condenser; 102-Acquisition unit; 104-Control unit. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] Considering that the integrated thermal management air conditioning system of a pure electric bus consists of a compressor, evaporator, throttling element, condenser, water tank, and necessary auxiliary equipment and components, it is an air conditioning system used to cool or heat the passenger compartment and battery pack of the pure electric bus. The integrated thermal management air conditioning system of a pure electric bus integrates the passenger compartment air conditioning system with the battery thermal management system, allowing them to share components such as the compressor, condenser, and condenser fan, and enabling unified control of both systems.

[0033] The integrated liquid cooling system (i.e., integrated thermal management air conditioning) of pure electric buses integrates the air conditioning system and battery liquid cooling system into one unit for unified control. This integrated liquid cooling system shares the same compressor, condenser, and other system components, reducing costs and space requirements, resulting in a more compact structure. However, in the battery cooling system (i.e., the air conditioning system and battery liquid cooling system) of the integrated thermal management air conditioning system (i.e., the integrated thermal management system and battery liquid cooling system) of pure electric buses, if the air conditioning system and the battery thermal management system (i.e., the battery liquid cooling system) are both activated, the air conditioning electronic expansion valve and the battery electronic expansion valve open simultaneously. The upper and lower limits of the battery electronic expansion valve's opening are both low, resulting in cooling capacity being delivered to the battery side. Furthermore, the cooling capacity increases with the opening of the battery electronic expansion valve. Therefore, the cooling capacity cannot meet the battery's cooling needs in a short time, making it impossible to quickly and effectively cool the pure electric bus's battery.

[0034] For example, when the air conditioning demand is not zero, the battery cooling system experiences a decrease in efficiency, failing to cool the battery quickly and impacting its lifespan. Some operating schemes limit the opening of the battery's electronic expansion valve when the air conditioning demand of the electric bus is not zero (i.e., the air conditioning electronic expansion valve is open). This limits the upper limit of the battery's electronic expansion valve opening, resulting in insufficient cooling for the battery in a short period, thus affecting its lifespan. Under this control method, when the air conditioning demand is not zero, the upper and lower limits of the battery's electronic expansion valve opening are restricted, resulting in a relatively low opening. This leads to insufficient cooling to lower the battery temperature quickly, causing the battery cooling time to be too long and failing to meet rapid cooling requirements.

[0035] To address the issue of insufficient efficiency and inability to quickly and effectively cool the batteries of pure electric buses in integrated thermal management air conditioning systems, this invention proposes a control method for an integrated liquid-cooled air conditioning system in a pure electric bus. Specifically, it provides a method for controlling the rapid cooling of the battery within the integrated liquid-cooled air conditioning system of a pure electric bus, thereby achieving rapid and effective cooling of the battery and ensuring that the battery quickly reaches a normal operating environment during fast charging and operation.

[0036] According to embodiments of the present invention, a control method for an integrated liquid-cooled air conditioning system in a pure electric bus is provided, such as... Figure 1The diagram shows a flow chart of an embodiment of the method of the present invention. The integrated liquid-cooled air conditioning system of the pure electric bus includes: a compressor 1, an external heat exchange unit, an internal heat exchange unit, an air conditioning flow control unit, a battery throttling unit, and a plate heat exchanger 7, as well as an external fan disposed at the external heat exchange unit. The plate heat exchanger 7 has a first heat exchange pipeline and a second heat exchange pipeline capable of exchanging heat with each other, the first heat exchange pipeline and the second heat exchange pipeline being arranged in parallel. The external heat exchange unit is an assembly formed by parallel condensers 8, the internal heat exchange unit is an assembly formed by parallel evaporators 6, the air conditioning flow control unit is an air conditioning electronic expansion valve 4, the battery throttling unit is a battery electronic expansion valve 3, and the external fan is an external fan 2. The exhaust port of the compressor 1 is divided into two paths after passing through the external heat exchange unit: one path returns to the intake port of the compressor 1 after passing through the air conditioning flow control unit and the internal heat exchange unit, and the other path returns to the intake port of the compressor 1 after passing through the battery throttling unit and the first heat exchange pipeline of the plate heat exchanger 7. The second heat exchange pipe of the plate heat exchanger 7 can exchange heat with the battery of the pure electric bus, such as the battery pack 5. The compressor 1, the external heat exchange unit, and the external fan are used in the integrated liquid-cooled air conditioning system of the pure electric bus, specifically in the air conditioning system and the battery liquid-cooling system. Figure 6 This is a schematic diagram of an embodiment of an integrated liquid-cooled air conditioning system for a pure electric bus. Figure 6 The integrated liquid-cooled air conditioning system shown includes: a compressor 1, an outdoor fan 2, a battery electronic expansion valve 3, an air conditioning electronic expansion valve 4, a battery pack 5, an evaporator 6, a plate heat exchanger 7, and a condenser 8. The resistor pack 5 is the battery of the pure electric bus. There are two evaporators 6, which are connected in parallel to form an evaporator assembly (i.e., the in-vehicle heat exchanger assembly). There are two condensers 8, which are connected in parallel to form a condenser assembly (i.e., the external heat exchanger assembly). An outdoor fan 2 is installed at the condenser assembly. The exhaust port of the compressor 1 is connected to the first end of the condenser assembly. The second end of the condenser assembly is divided into two paths after passing through a pipeline: one path is connected to the second end of the evaporator assembly via the air conditioning electronic expansion valve 4, and the other path is connected to the second end of the first heat exchange pipeline of the plate heat exchanger 7 via the battery electronic expansion valve 3. The first end of the evaporator assembly is connected to the suction port of the compressor 1, and the first end of the first heat exchange pipeline of the plate heat exchanger 7 is also connected to the suction port of the compressor 1. The first end of the second heat exchange pipe of the plate heat exchanger 7 is connected to the first end of the heat exchange pipe of the battery pack 5. The second end of the heat exchange pipe of the battery pack 5 is connected to the second end of the second heat exchange pipe of the plate heat exchanger 7. The control method of the integrated liquid-cooled air conditioning system of the pure electric bus includes steps S110 to S140.

[0037] In step S110, after the integrated liquid-cooled air conditioning system of the pure electric bus is turned on, the integrated liquid-cooled air conditioning system of the pure electric bus is controlled to operate in cooling mode so that the integrated liquid-cooled air conditioning system of the pure electric bus enters the cooling stage.

[0038] In step S120, during the cooling phase of the integrated liquid-cooled air conditioning system of the pure electric bus, the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is obtained, the outlet water temperature of the plate heat exchanger 7 is obtained, and the temperature of the battery of the pure electric bus is obtained and recorded as the battery temperature of the pure electric bus.

[0039] The current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is as follows: the first cooling demand when the integrated liquid-cooled air conditioning system receives a cooling command, or the second cooling demand when the battery of the pure electric bus is charging or the ambient temperature inside the vehicle is lower than the set temperature. The current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is either a combined cooling mode in which the air conditioning system and the battery liquid-cooling system operate simultaneously, or a separate cooling mode in which the air conditioning system is not operating and the battery liquid-cooling system operates alone.

[0040] In step S130, the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined according to the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus.

[0041] In some implementations, the specific process of determining the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus based on the current cooling demand of the integrated liquid-cooled air conditioning system in step S130 is described in the following exemplary description.

[0042] The following is combined Figure 2 The flowchart shown is a schematic diagram of an embodiment of the method of the present invention for determining the current working mode of the integrated liquid-cooled air conditioning system of a pure electric bus. It further illustrates the process of determining the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus in step S130, including steps S210 to S230.

[0043] Step S210: Determine whether the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand or the second cooling demand.

[0044] Step S220: If the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand, then the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the common cooling mode.

[0045] Step S230: If the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the second cooling demand, then the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the standalone cooling mode.

[0046] Specifically, Figure 7 This is a schematic flowchart illustrating an embodiment of a method for controlling rapid battery cooling using an integrated liquid-cooled air conditioning system in a pure electric bus according to the present invention. Figure 7 As shown, the present invention proposes a method for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus, comprising:

[0047] Step 1: The integrated liquid-cooled air conditioning system of the pure electric bus is turned on. The integrated liquid-cooled air conditioning system of the pure electric bus runs in cooling mode and enters the first stage of cooling operation. Then, proceed to Step 2.

[0048] Step 2: Control the opening degree of the battery electronic expansion valve 3 to D1, and control the opening degree of the air conditioning electronic expansion valve 4 to K1. Then: If the air conditioning and battery of the pure electric bus are started simultaneously to cool the passenger compartment and the battery of the pure electric bus, then proceed to step 3. If the battery of the pure electric bus is started separately to cool the battery of the pure electric bus, then proceed to step 4.

[0049] In step S140, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in combination with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus are controlled, and the opening degree of the air conditioning flow control unit and the battery throttling unit is adjusted to achieve flexible adjustment of the rapid cooling process of the battery of the pure electric bus.

[0050] The present invention proposes a method for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for pure electric buses. This method allows the air conditioning system to adjust the operation of the air conditioning electronic expansion valve and the battery electronic expansion valve based on the received demand signal from the battery cooling system of the pure electric bus. This achieves rapid and effective cooling of the battery, ensuring that the battery quickly has a normal operating environment during fast charging and operation, thereby extending the battery's service life.

[0051] The integrated liquid-cooled air conditioning system of a pure electric bus includes an air conditioning system and a battery liquid-cooling system. Figure 6In the integrated liquid-cooled air conditioning system of the pure electric bus shown, compressor 1, condenser 8, and outdoor fan 2 are shared structural components of the air conditioning system and battery liquid cooling system. The opening degree of battery electronic expansion valve 3 and air conditioning electronic expansion valve 4 are adjustable. By controlling the opening degree of battery electronic expansion valve 3, rapid cooling of the battery (i.e., battery pack 5) of the pure electric bus can be achieved. In the solution of the present invention, in two modes—a simultaneous start-up mode that includes both the air conditioning and battery of the pure electric bus to cool the passenger compartment and the battery of the pure electric bus, and a separate start-up mode where the battery of the pure electric bus is used to cool the battery of the pure electric bus—the upper and lower limits of the opening degree of the battery electronic expansion valve are controlled respectively. This increases the opening degree of the battery electronic expansion valve, allowing for rapid cooling of the battery without affecting the cooling demand of the passenger compartment. This achieves rapid and effective cooling of the battery of the pure electric bus, ensuring that the battery of the pure electric bus quickly has a normal working environment during fast charging and operation.

[0052] In some embodiments, step S140, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow regulating unit and the battery throttling unit. This includes: a first control process in the common cooling mode in which the air conditioning system and the battery liquid cooling system of the integrated liquid-cooled air conditioning system of the pure electric bus operate simultaneously, that is, the process of adjusting the opening degree of the air conditioning flow regulating unit and the battery throttling unit in the common cooling mode.

[0053] The following is combined Figure 3 The schematic diagram shows an embodiment of the method of the present invention, which adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit in the common cooling mode. It further illustrates the specific process of adjusting the opening degree of the air conditioning flow control unit and the battery throttling unit in the common cooling mode in step S140, including steps S310 to S320.

[0054] Step S310: When the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a common cooling mode in which the air conditioning system and the battery liquid-cooled system operate simultaneously, the compressor 1 is controlled not to start, the external fan is controlled to start and run, the opening degree of the battery throttling unit is controlled to increase to a first set opening degree (e.g., opening degree D1), and the opening degree of the air conditioning flow regulating unit is controlled to increase to a second set opening degree (e.g., opening degree K1). Wherein, both the first set opening degree and the second set opening degree are within the range of the first set opening degree, such as opening degree d1 to opening degree d2.

[0055] Step S320: After a first set time period, if it is determined that the outlet water temperature of the plate heat exchanger 7 has risen to a first temperature range (e.g., range A), and a cooling signal indicating that the battery needs to be cooled is received from the BMS of the pure electric bus's battery, then the integrated liquid-cooled air conditioning system of the pure electric bus is controlled to enter the priority cooling stage. In the priority cooling stage, the opening degree of the battery throttling unit is adjusted from the first set opening degree to a third set opening degree (e.g., opening degree D2). The third set opening degree is within the range of the second set opening degree, such as opening degree d3 to opening degree d4. The lower limit of the second set opening degree range is greater than the upper limit of the first set opening degree range.

[0056] See Figure 6In the example shown, in the integrated liquid-cooled air conditioning system of a pure electric bus, the high-temperature and high-pressure gas compressed by the compressor 1 is discharged through the exhaust port of the compressor 1 and enters the condenser assembly. After being cooled into liquid by the operation of the external fan 2, part of the liquid enters the evaporator assembly through the air conditioning electronic expansion valve 4 to cool the passenger compartment, while the other part of the liquid enters the plate heat exchanger 7 through the battery electronic expansion valve 3 to cool the battery pack 5. Under normal circumstances, when the demand of the air conditioning system of the pure electric bus is zero, the upper and lower limits of the opening of the battery electronic expansion valve 3 are relatively high, which can achieve rapid cooling. However, in the relevant scheme, when the control system of the pure electric bus receives the demand signal of the air conditioning system of the pure electric bus, the air conditioning electronic expansion valve 4 opens and the opening of the air conditioning electronic expansion valve 4 begins to increase. Since the cooling demand of the passenger compartment is much greater than the cooling demand of the battery pack 5, during the period when the opening of the air conditioning electronic expansion valve 4 increases, the opening of the battery electronic expansion valve 3 decreases from the high point of stability, and the upper and lower limits of the opening of the battery electronic expansion valve 3 also become smaller. This results in insufficient cooling during the cooling process of the battery pack, and the battery pack 5 cannot be cooled down quickly. The solution of this invention is to change the upper and lower limits of the opening of the battery electronic expansion valve 3 in this situation. It increases the original upper and lower limits of the opening of the battery electronic expansion valve 3, for example, increasing it from 50-200° to 250-480°. Specifically, this can be achieved by modifying the battery electronic expansion valve 3 to increase its opening limits. This maintains the opening of the battery electronic expansion valve 3, enabling rapid cooling of the battery pack 5 and protecting its lifespan. Specifically, when quantifying whether the demand for the air conditioning system of the pure electric bus is zero, the need to turn on the air conditioning system can be determined by the discharge state of the battery pack 5 and the interior temperature of the pure electric bus. In testing, under the cooling state of the pure electric bus's air conditioning system, the temperature of the battery (e.g., battery pack 5) can be reduced to a safe operating range within one hour, which is faster than the temperature reduction speed of the battery in related solutions. For example, when the battery (such as battery pack 5) of a pure electric bus is charging, the time required to cool the battery (such as battery pack 5) of the pure electric bus by 10°C is 13 minutes.

[0057] Specifically, such as Figure 7 As shown, the present invention proposes a method for controlling rapid battery cooling using an integrated liquid-cooled air conditioning system in a pure electric bus, which further includes:

[0058] Step 3: When the integrated liquid-cooled air conditioning system of the pure electric bus receives the cooling mode signal, the air conditioning cooling system and the battery cooling system are turned on simultaneously (i.e., the air conditioning and battery of the pure electric bus are started simultaneously to cool the passenger compartment and the battery of the pure electric bus). At this time, the compressor 1 is not started, the external fan 2 is running, the opening degree of the battery electronic expansion valve 3 is D1, and the opening degree of the air conditioning electronic expansion valve 4 is K1 (preferably 0-100, unit is B). The first stage is entered. At this time, the upper and lower limits of the opening degree of the battery electronic expansion valve 3 are d1-d2 (preferably 50-200, unit is B). That is, the lower limit of the opening degree of the battery electronic expansion valve 3 is preferably 50, and the upper limit of the opening degree is preferably 200.

[0059] Step 31: After a period of stable operation, the battery temperature rises, the outlet water temperature of the solar panel (i.e., the outlet water temperature of plate heat exchanger 7) is in range A, and the battery management system (BMS) sends a "cooling mode" signal. If the outlet water temperature of the solar panel changes from range B to range A (e.g., ... Figure 8 When the battery temperature is greater than or equal to 17℃, and the water temperature at the battery panel outlet changes from zone B to zone A, the integrated liquid-cooled air conditioning system of the pure electric bus enters rapid cooling control. The upper and lower limits of the opening of the battery electronic expansion valve 3 rise to d3-d4 (preferably 250-480, unit is B steps). The specific time period can be determined based on the battery temperature rise and the influence of the outdoor air temperature on the battery temperature, and can be measured through experimental data.

[0060] In step S302, the second set opening range includes a first opening interval, a second opening interval, and a third opening interval. The lower limit of the first opening interval is greater than or equal to the lower limit of the second set opening range, the upper limit of the first opening interval is less than or equal to the lower limit of the second opening interval, the upper limit of the second opening interval is greater than the lower limit of the third opening interval, and the upper limit of the third opening interval is greater than the upper limit of the second opening interval and less than or equal to the upper limit of the second set opening range. For example, if the second set opening range d3-d4 is preferably 250-480, then the first opening interval is 250-360, the second opening interval is 360-460, and the third opening interval is 400-480.

[0061] Step S140, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and combined with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit. It also includes a second control process in the common cooling mode where the air conditioning system and the battery liquid cooling system operate simultaneously in the integrated liquid-cooled air conditioning system of the pure electric bus. Specifically, this includes: after the opening degree of the battery throttling unit has risen to the desired level within the first opening degree range of the second set opening degree range. If, after a second set opening interval within the second set opening range, the water temperature continues to rise and eventually stabilizes within the third opening interval within the second set opening range, and after a second set time period, if it is determined that the outlet water temperature of the plate heat exchanger 7 has dropped to the second temperature range (e.g., range B), and a non-charging signal indicating that the battery is not being charged is received from the BMS of the pure electric bus's battery, then the integrated liquid-cooled air conditioning system of the pure electric bus is controlled to exit the priority cooling phase. That is, the opening degree of the battery throttling unit is adjusted from the third set opening degree to the first set opening degree, thereby controlling the integrated liquid-cooled air conditioning system of the pure electric bus to enter the normal control phase. The upper limit of the second temperature range is less than or equal to the lower limit of the first temperature range.

[0062] Specifically, such as Figure 7 As shown, the present invention proposes a method for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus, which further includes: in step 31, during the rapid cooling control process, the upper and lower limits of the opening of the battery electronic expansion valve 3 rise to d3-d4 (preferably 250-480, unit is B, i.e., step), the opening of the battery electronic expansion valve 3 rapidly rises from opening D1 to opening D2 (preferably 360-460), and then the stable value of opening D2 is in the range of 400-480. After the rapid cooling process, the rapid cooling process lasts for less than one hour. When the water temperature of the battery panel is in the B range and the battery management system (BMS) sends a "non-charging mode" signal, the rapid cooling control system is exited, the opening of the battery electronic expansion valve 3 drops from opening D2 to opening D1, the upper and lower limits of the opening of the battery electronic expansion valve 3 are restored to d1-d2, and the normal control stage is entered.

[0063] In some embodiments, step S140, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow regulating unit and the battery throttling unit. It also includes a control process in a separate cooling mode in the integrated liquid-cooled air conditioning system of the pure electric bus where the air conditioning system is not working and the battery liquid cooling system is working alone, that is, the process of adjusting the opening degree of the air conditioning flow regulating unit and the battery throttling unit in the separate cooling mode.

[0064] The following is combined Figure 4 The schematic diagram shows an embodiment of the method of the present invention, which adjusts the opening degree of the air conditioning regulating unit and the battery throttling unit in the standalone cooling mode. It further illustrates the specific process of adjusting the opening degree of the air conditioning regulating unit and the battery throttling unit in the standalone cooling mode in step S140, including steps S410 to S430.

[0065] Step S410: When the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a separate cooling mode where the air conditioning system is not working and the battery liquid-cooled system is working alone, the opening degree of the battery throttling unit is increased to a fourth set opening degree (e.g., opening degree D4), and the air conditioning flow control unit is turned off. The fourth set opening degree is within the range of a third set opening degree, such as opening degree d5 to opening degree d6.

[0066] Step S420: After the third set time period, if it is determined that the battery temperature of the pure electric bus has risen to the set maximum temperature, and a charging signal indicating that the battery is being charged is received from the battery management system (BMS) of the pure electric bus, then the integrated liquid-cooled air conditioning system of the pure electric bus is controlled to enter the priority cooling stage. In the priority cooling stage, the opening degree of the battery throttling unit is adjusted from the fourth set opening degree to the fifth set opening degree (e.g., opening degree D5). The fifth set opening degree is within the range of the fourth set opening degree, such as opening degree d7 to opening degree d8. The lower limit of the fourth set opening degree range is greater than the lower limit of the third set opening degree range, and the upper limit of the fourth set opening degree range is equal to the upper limit of the third set opening degree range.

[0067] In step S430, until the battery temperature of the pure electric bus drops to the set minimum temperature and a signal is received from the battery BMS of the pure electric bus indicating that the battery is not being charged and not being cooled, the integrated liquid-cooled air conditioning system of the pure electric bus is controlled to exit the priority cooling stage, that is, the opening degree of the battery throttling unit is adjusted from the fifth set opening degree to the fourth set opening degree, so as to control the integrated liquid-cooled air conditioning system of the pure electric bus to enter the normal control stage.

[0068] Specifically, such as Figure 7 As shown, the present invention proposes a method for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus, which further includes: Step 4: When the integrated liquid-cooled air conditioning system of the pure electric bus is charging or the ambient temperature is not high, the battery cooling system is turned on separately, the opening degree of the battery electronic expansion valve 3 is D3, and the air conditioning electronic expansion valve 4 is closed. At this time, the upper and lower limits of the opening degree of the battery electronic expansion valve 3 are d5-d6 (preferably 100-480, unit is B, i.e., step). After stable operation for a period of time, the battery temperature of the battery pack 5 rises to the set temperature (this temperature can be the temperature at which the battery needs to be cooled down), and the battery management system (BMS) sends a "charging mode" signal to enter the battery rapid cooling control system. The opening degree of the battery electronic expansion valve 3 increases to D4. At this time, the upper and lower limits of the opening degree of the battery electronic expansion valve 3 are d7-d8 (preferably 250-480, unit is B, i.e. step). When the battery temperature of the battery pack 5 drops to the lowest value, the battery management system (BMS) sends "non-charging mode" and "non-cooling mode" signals, and the whole vehicle exits the battery rapid cooling control system and enters the normal control stage.

[0069] In the solution of this invention, there is no control action for the single-use air conditioning cooling mode, and it operates according to the normal vehicle control system.

[0070] Figure 8 This is a schematic diagram of the temperature range in a method for controlling rapid battery cooling using an integrated liquid-cooled air conditioning system for a pure electric bus according to the present invention. Figure 8 In this context, Tlo is the outlet water temperature of plate heat exchanger 7, Ts is the initial set temperature of battery pack 5, and A is a preset value. When entering zone B from zone A, the outlet water temperature Tlo of plate heat exchanger 7 is less than the initial set temperature Ts of battery pack 5. When entering zone A from zone B, the outlet water temperature Tlo of plate heat exchanger 7 is greater than or equal to the initial set temperature Ts of battery pack 5 plus the preset value A. For example: In Figure 8In the example shown, the initial set temperature Ts of battery pack 5 can be 17°C, and the preset value A can be 2°C. The line segment between the initial set temperature Ts of battery pack 5 and the initial set temperature Ts + preset value A of battery pack 5 can represent the transition process of the opening degree of battery electronic expansion valve 3 from the range d1-d2 of opening degree D1 to the range d3-d4 of opening degree D2. (Refer to...) Figure 6 and Figure 8 As shown in the example, during the operation or charging of a pure electric bus, when the temperature of the battery of the pure electric bus reaches a certain temperature value set in the program, the temperature sensor on the battery side of the pure electric bus sends a signal that the temperature of the battery of the pure electric bus has reached a certain temperature value set in the program, which is the demand signal from the battery cooling system of the pure electric bus.

[0071] The present invention achieves rapid cooling by increasing the upper and lower limits of the opening of the battery electronic expansion valve 3 when the battery (such as battery pack 5) of the pure electric bus needs to be cooled. In this way, by changing the upper and lower limits of the opening of the battery electronic expansion valve 3 of the pure electric bus, the opening size of the battery electronic expansion valve 3 of the pure electric bus is adjusted, thereby achieving rapid cooling of the battery of the pure electric bus. This ensures that the battery of the pure electric bus quickly has a normal working environment during fast charging and operation.

[0072] The technical solution of this embodiment, through the integrated liquid-cooled air conditioning system for pure electric buses, operates in two modes: a simultaneous start-up mode where the air conditioning and battery of the pure electric bus are activated simultaneously to cool the passenger compartment and the battery, and a separate start-up mode where the battery cools the battery independently. In this mode, the air conditioning system controls the upper and lower limits of the battery electronic expansion valve opening based on the demand signal received from the battery cooling system. This increases the opening of the battery electronic expansion valve, rapidly cooling the battery without affecting the cooling demand of the passenger compartment. This achieves rapid and effective cooling of the battery. Furthermore, by adjusting the operation of the air conditioning electronic expansion valve and the battery electronic expansion valve in the integrated liquid-cooled air conditioning system according to the demand signal from the battery cooling system, rapid and effective cooling of the battery is achieved, ensuring that the battery quickly reaches a normal operating environment during fast charging and operation.

[0073] According to embodiments of the present invention, a control device for an integrated liquid-cooled air conditioning system of a pure electric bus is also provided, corresponding to a control method for an integrated liquid-cooled air conditioning system of a pure electric bus. See also Figure 5The diagram shows a structural schematic of an embodiment of the device of the present invention. The integrated liquid-cooled air conditioning system of the pure electric bus includes: a compressor 1, an external heat exchange unit, an internal heat exchange unit, an air conditioning flow control unit, a battery throttling unit, and a plate heat exchanger 7, as well as an external fan disposed at the external heat exchange unit. The plate heat exchanger 7 has a first heat exchange pipeline and a second heat exchange pipeline capable of exchanging heat with each other, and the first heat exchange pipeline and the second heat exchange pipeline are arranged in parallel. The external heat exchange unit is an assembly formed by parallel condensers 8, the internal heat exchange unit is an assembly formed by parallel evaporators 6, the air conditioning flow control unit is an air conditioning electronic expansion valve 4, the battery throttling unit is a battery electronic expansion valve 3, and the external fan is an external fan 2. The exhaust port of the compressor 1 is divided into two paths after passing through the external heat exchange unit: one path returns to the intake port of the compressor 1 after passing through the air conditioning flow control unit and the internal heat exchange unit, and the other path returns to the intake port of the compressor 1 after passing through the battery throttling unit and the first heat exchange pipeline of the plate heat exchanger 7. The second heat exchange pipe of the plate heat exchanger 7 can exchange heat with the battery of the pure electric bus, such as the battery pack 5. The compressor 1, the external heat exchange unit, and the external fan are used in the integrated liquid-cooled air conditioning system of the pure electric bus, specifically in the air conditioning system and the battery liquid-cooling system. Figure 6 This is a schematic diagram of an embodiment of an integrated liquid-cooled air conditioning system for a pure electric bus. Figure 6 The integrated liquid-cooled air conditioning system shown includes: a compressor 1, an outdoor fan 2, a battery electronic expansion valve 3, an air conditioning electronic expansion valve 4, a battery pack 5, an evaporator 6, a plate heat exchanger 7, and a condenser 8. The resistor pack 5 is the battery of the pure electric bus. There are two evaporators 6, which are connected in parallel to form an evaporator assembly (i.e., the in-vehicle heat exchanger assembly). There are two condensers 8, which are connected in parallel to form a condenser assembly (i.e., the external heat exchanger assembly). An outdoor fan 2 is installed at the condenser assembly. The exhaust port of the compressor 1 is connected to the first end of the condenser assembly. The second end of the condenser assembly is divided into two paths after passing through a pipeline: one path is connected to the second end of the evaporator assembly via the air conditioning electronic expansion valve 4, and the other path is connected to the second end of the first heat exchange pipeline of the plate heat exchanger 7 via the battery electronic expansion valve 3. The first end of the evaporator assembly is connected to the suction port of the compressor 1, and the first end of the first heat exchange pipeline of the plate heat exchanger 7 is also connected to the suction port of the compressor 1. The first end of the second heat exchange pipe of the plate heat exchanger 7 is connected to the first end of the heat exchange pipe of the battery pack 5. The second end of the heat exchange pipe of the battery pack 5 is connected to the second end of the second heat exchange pipe of the plate heat exchanger 7. The control device of the integrated liquid-cooled air conditioning system of the pure electric bus includes: an acquisition unit 102 and a control unit 104.

[0074] The control unit 104 is configured to control the integrated liquid-cooled air conditioning system of the pure electric bus to operate in cooling mode after the system is turned on, so that the integrated liquid-cooled air conditioning system of the pure electric bus enters the cooling stage. The specific functions and processing of the control unit 104 are described in step S110.

[0075] The acquisition unit 102 is configured to, during the cooling phase of the integrated liquid-cooled air conditioning system of the pure electric bus, acquire the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus, acquire the outlet water temperature of the plate heat exchanger 7, and acquire the battery temperature of the pure electric bus as the battery temperature of the pure electric bus. For the specific functions and processing of this acquisition unit 102, please refer to step S120.

[0076] The current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is as follows: the first cooling demand when the integrated liquid-cooled air conditioning system receives a cooling command, or the second cooling demand when the battery of the pure electric bus is charging or the ambient temperature inside the vehicle is lower than the set temperature. The current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is either a combined cooling mode in which the air conditioning system and the battery liquid-cooling system operate simultaneously, or a separate cooling mode in which the air conditioning system is not operating and the battery liquid-cooling system operates alone.

[0077] The control unit 104 is further configured to determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus based on the current cooling demand of the integrated liquid-cooled air conditioning system. The specific functions and processing of this control unit 104 are further described in step S130.

[0078] In some embodiments, the control unit 104 determines the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus based on the current cooling demand of the integrated liquid-cooled air conditioning system, including:

[0079] The control unit 104 is further configured to determine whether the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand or the second cooling demand. The specific functions and processing of the control unit 104 are further described in step S210.

[0080] The control unit 104 is further configured to determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus as the common cooling mode if the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand. The specific functions and processing of the control unit 104 are further described in step S220.

[0081] The control unit 104 is further configured to determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus as the separate cooling mode if the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the second cooling demand. The specific functions and processing of the control unit 104 are further described in step S230.

[0082] Specifically, Figure 7 This is a schematic flowchart illustrating an embodiment of a device for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus according to the present invention. Figure 7 As shown, the present invention proposes a device for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus, comprising:

[0083] Step 1: The integrated liquid-cooled air conditioning system of the pure electric bus is turned on. The integrated liquid-cooled air conditioning system of the pure electric bus runs in cooling mode and enters the first stage of cooling operation. Then, proceed to Step 2.

[0084] Step 2: Control the opening degree of the battery electronic expansion valve 3 to D1, and control the opening degree of the air conditioning electronic expansion valve 4 to K1. Then: If the air conditioning and battery of the pure electric bus are started simultaneously to cool the passenger compartment and the battery of the pure electric bus, then proceed to step 3. If the battery of the pure electric bus is started separately to cool the battery of the pure electric bus, then proceed to step 4.

[0085] The control unit 104 is further configured to control the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid cooling air conditioning system of the pure electric bus according to the current operating mode of the integrated liquid cooling air conditioning system of the pure electric bus, and in combination with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, and to adjust the opening degree of the air conditioning flow control unit and the battery throttling unit, so as to achieve flexible adjustment of the rapid cooling process of the battery of the pure electric bus. The specific functions and processing of this control unit 104 are further described in step S140.

[0086] The present invention proposes a device for controlling the rapid cooling of the battery in an integrated liquid-cooled air conditioning system for a pure electric bus. This device adjusts the operation of the air conditioning electronic expansion valve and the battery electronic expansion valve based on the received demand signal from the battery cooling system of the pure electric bus. This achieves rapid and effective cooling of the battery, ensuring that the battery quickly has a normal operating environment during fast charging and operation, thereby extending the battery's service life.

[0087] The integrated liquid-cooled air conditioning system of a pure electric bus includes an air conditioning system and a battery liquid-cooling system. Figure 6In the integrated liquid-cooled air conditioning system of the pure electric bus shown, compressor 1, condenser 8, and outdoor fan 2 are shared structural components of the air conditioning system and battery liquid cooling system. The opening degree of battery electronic expansion valve 3 and air conditioning electronic expansion valve 4 are adjustable. By controlling the opening degree of battery electronic expansion valve 3, rapid cooling of the battery (i.e., battery pack 5) of the pure electric bus can be achieved. In the solution of the present invention, in two modes—a simultaneous start-up mode that includes both the air conditioning and battery of the pure electric bus to cool the passenger compartment and the battery of the pure electric bus, and a separate start-up mode where the battery of the pure electric bus is used to cool the battery of the pure electric bus—the upper and lower limits of the opening degree of the battery electronic expansion valve are controlled respectively. This increases the opening degree of the battery electronic expansion valve, allowing for rapid cooling of the battery without affecting the cooling demand of the passenger compartment. This achieves rapid and effective cooling of the battery of the pure electric bus, ensuring that the battery of the pure electric bus quickly has a normal working environment during fast charging and operation.

[0088] In some embodiments, the control unit 104, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit. This includes a first control process in the common cooling mode where the air conditioning system and the battery liquid cooling system operate simultaneously in the integrated liquid-cooled air conditioning system of the pure electric bus, specifically as follows:

[0089] The control unit 104 is further configured to, when the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a common cooling mode in which the air conditioning system and the battery liquid-cooled system operate simultaneously, control the compressor 1 not to start, control the external fan to start and run, control the opening degree of the battery throttling unit to increase to a first set opening degree (e.g., opening degree D1), and control the opening degree of the air conditioning flow regulating unit to increase to a second set opening degree (e.g., opening degree K1). Both the first set opening degree and the second set opening degree are within the range of the first set opening degree, such as opening degree d1 to opening degree d2. The specific functions and processing of this control unit 104 are further described in step S310.

[0090] The control unit 104 is further configured to, after a first set time period, if it is determined that the outlet water temperature of the plate heat exchanger 7 has risen to a first temperature range (e.g., range A), and a cooling signal indicating that the battery needs to be cooled is received from the BMS of the pure electric bus's battery, then control the integrated liquid-cooled air conditioning system of the pure electric bus to enter a priority cooling phase. In the priority cooling phase, the opening degree of the battery throttling unit is adjusted from the first set opening degree to a third set opening degree (e.g., opening degree D2). The third set opening degree is within the range of the second set opening degree, such as opening degree d3 to opening degree d4. The lower limit of the second set opening degree range is greater than the upper limit of the first set opening degree range. The specific functions and processing of this control unit 104 are further described in step S320.

[0091] See Figure 6In the example shown, in the integrated liquid-cooled air conditioning system of a pure electric bus, the high-temperature and high-pressure gas compressed by the compressor 1 is discharged through the exhaust port of the compressor 1 and enters the condenser assembly. After being cooled into liquid by the operation of the external fan 2, part of the liquid enters the evaporator assembly through the air conditioning electronic expansion valve 4 to cool the passenger compartment, while the other part of the liquid enters the plate heat exchanger 7 through the battery electronic expansion valve 3 to cool the battery pack 5. Under normal circumstances, when the demand of the air conditioning system of the pure electric bus is zero, the upper and lower limits of the opening of the battery electronic expansion valve 3 are relatively high, which can achieve rapid cooling. However, in the relevant scheme, when the control system of the pure electric bus receives the demand signal of the air conditioning system of the pure electric bus, the air conditioning electronic expansion valve 4 opens and the opening of the air conditioning electronic expansion valve 4 begins to increase. Since the cooling demand of the passenger compartment is much greater than the cooling demand of the battery pack 5, during the period when the opening of the air conditioning electronic expansion valve 4 increases, the opening of the battery electronic expansion valve 3 decreases from the high point of stability, and the upper and lower limits of the opening of the battery electronic expansion valve 3 also become smaller. This results in insufficient cooling during the cooling process of the battery pack, and the battery pack 5 cannot be cooled down quickly. The solution of this invention is to change the upper and lower limits of the opening of the battery electronic expansion valve 3 in this situation. It increases the opening limits of the battery electronic expansion valve 3 beyond its original limits, for example, by modifying the battery electronic expansion valve 3 to increase its opening limits. This maintains the opening of the battery electronic expansion valve 3, enabling rapid cooling of the battery pack 5 and protecting its lifespan. Specifically, when quantifying whether the demand for the air conditioning system of the pure electric bus is zero, the need to turn on the air conditioning system can be determined by the discharge state of the battery pack 5 and the interior temperature of the pure electric bus. In testing, under the cooling state of the pure electric bus's air conditioning system, the temperature of the battery (e.g., battery pack 5) can be reduced to a safe operating range within one hour, which is faster than the temperature reduction speed of the battery in related solutions. For example, when the battery (such as battery pack 5) of a pure electric bus is charging, the time required to cool the battery (such as battery pack 5) of the pure electric bus by 10°C is 13 minutes.

[0092] Specifically, such as Figure 7 As shown, the present invention provides a device for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus, which further includes:

[0093] Step 3: When the integrated liquid-cooled air conditioning system of the pure electric bus receives the cooling mode signal, the air conditioning cooling system and the battery cooling system are turned on simultaneously (i.e., the air conditioning and battery of the pure electric bus are started simultaneously to cool the passenger compartment and the battery of the pure electric bus). At this time, the compressor 1 is not started, the external fan 2 is running, the opening degree of the battery electronic expansion valve 3 is D1, and the opening degree of the air conditioning electronic expansion valve 4 is K1 (preferably 0-100, unit is B). The first stage is entered. At this time, the upper and lower limits of the opening degree of the battery electronic expansion valve 3 are d1-d2 (preferably 50-200, unit is B). That is, the lower limit of the opening degree of the battery electronic expansion valve 3 is preferably 50, and the upper limit of the opening degree is preferably 200.

[0094] Step 31: After a period of stable operation, the battery temperature rises, the outlet water temperature of the solar panel (i.e., the outlet water temperature of plate heat exchanger 7) is in range A, and the battery management system (BMS) sends a "cooling mode" signal. If the outlet water temperature of the solar panel changes from range B to range A (e.g., ... Figure 8 When the battery temperature is greater than or equal to 17°C, the water temperature of the battery panel changes from zone B to zone A. Then the integrated liquid-cooled air conditioning system of the pure electric bus enters rapid cooling control, and the upper and lower limits of the opening of the battery electronic expansion valve 3 rise to d3-d4 (preferably 250-480, unit is B step).

[0095] The second set opening range includes a first opening interval, a second opening interval, and a third opening interval. The lower limit of the first opening interval is greater than or equal to the lower limit of the second set opening range, the upper limit of the first opening interval is less than or equal to the lower limit of the second opening interval, the upper limit of the second opening interval is greater than the lower limit of the third opening interval, and the upper limit of the third opening interval is greater than the upper limit of the second opening interval and less than or equal to the upper limit of the second set opening range. For example, if the second set opening range d3-d4 is preferably 250-480, then the first opening interval is 250-360, the second opening interval is 360-460, and the third opening interval is 400-480.

[0096] In some embodiments, the control unit 104, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit. It also includes a second control process in the common cooling mode where the air conditioning system and the battery liquid cooling system operate simultaneously in the integrated liquid-cooled air conditioning system of the pure electric bus. Specifically, the control unit 104 is further configured to adjust the opening degree of the battery throttling unit within a second set opening degree range. If, after the first opening interval within the range has risen to the second opening interval within the second set opening range, and continues to rise and eventually stabilizes at the third opening interval within the second set opening range, after the second set time period, if it is determined that the outlet water temperature of the plate heat exchanger 7 has dropped to the second temperature range (e.g., interval B), and a non-charging signal from the BMS of the pure electric bus indicating that the battery is not being charged is received, then the integrated liquid-cooled air conditioning system of the pure electric bus is controlled to exit the priority cooling stage. That is, the opening of the battery throttling unit is adjusted from the third set opening to the first set opening, thereby controlling the integrated liquid-cooled air conditioning system of the pure electric bus to enter the normal control stage. The upper limit of the second temperature range is less than or equal to the lower limit of the first temperature range.

[0097] Specifically, such as Figure 7 As shown, the present invention proposes a device for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus, which further includes: in step 31, during the rapid cooling control process, the upper and lower limits of the opening of the battery electronic expansion valve 3 rise to d3-d4 (preferably 250-480, unit is B, i.e., step), the opening of the battery electronic expansion valve 3 rapidly rises from opening D1 to opening D2 (preferably 360-460), and then the stable value of opening D2 is in the range of 400-480. After the rapid cooling process, the rapid cooling process lasts for less than one hour. When the water temperature of the battery panel is in the B range and the battery management system (BMS) sends a "non-charging mode" signal, the rapid cooling control system is exited, the opening of the battery electronic expansion valve 3 drops from opening D2 to opening D1, the upper and lower limits of the opening of the battery electronic expansion valve 3 return to d1-d2, and the normal control stage is entered.

[0098] In some embodiments, the control unit 104, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger 7 and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit. It also includes a control process in a separate cooling mode where the air conditioning system is not operating and the battery liquid cooling system operates independently, as detailed below:

[0099] The control unit 104 is further configured to, when the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a separate cooling mode where the air conditioning system is not working and the battery liquid-cooled system is working alone, control the opening degree of the battery throttling unit to increase to a fourth preset opening degree, and control the air conditioning flow control unit to close. The fourth preset opening degree is within the range of the third preset opening degree, and the first preset opening degree is within the range of opening degree d1 to opening degree d2. The specific functions and processing of this control unit 104 are further described in step S410.

[0100] The control unit 104 is further configured to, after a third set time period, if it is determined that the battery temperature of the pure electric bus has risen to a set maximum temperature and a charging signal indicating that the battery is being charged is received from the battery management system (BMS) of the pure electric bus, then control the integrated liquid-cooled air conditioning system of the pure electric bus to enter a priority cooling phase. In the priority cooling phase, the opening degree of the battery throttling unit is adjusted from the fourth set opening degree to a fifth set opening degree (e.g., opening degree D5). The fifth set opening degree is within the range of the fourth set opening degree, such as opening degree d7 to opening degree d8. The lower limit of the fourth set opening degree range is greater than the lower limit of the third set opening degree range, and the upper limit of the fourth set opening degree range is equal to the upper limit of the third set opening degree range. The specific functions and processing of this control unit 104 are further described in step S420.

[0101] The control unit 104 is further configured to, when the battery temperature of the pure electric bus drops to a set minimum temperature and a signal is received from the battery management system (BMS) of the pure electric bus indicating that the battery is neither being charged nor cooled, control the integrated liquid-cooled air conditioning system of the pure electric bus to exit the priority cooling phase. Specifically, the control unit adjusts the opening degree of the battery throttling unit from the fifth set opening degree to the fourth set opening degree, thereby controlling the integrated liquid-cooled air conditioning system of the pure electric bus to enter the normal control phase. The specific functions and processing of this control unit 104 are further described in step S430.

[0102] Specifically, such as Figure 7As shown, the present invention proposes a device for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus, which further includes: Step 4: When the integrated liquid-cooled air conditioning system of the pure electric bus is charging or the ambient temperature is not high, the battery cooling system is turned on separately, the opening degree of the battery electronic expansion valve 3 is D3, and the air conditioning electronic expansion valve 4 is closed. At this time, the upper and lower limits of the opening degree of the battery electronic expansion valve 3 are d5-d6 (preferably 100-480, unit is B, i.e., step). After stable operation for a period of time, the battery temperature of the battery pack 5 rises, and the battery management system (BMS) sends a "charging mode" signal to enter the battery rapid cooling control system. The opening degree of the battery electronic expansion valve 3 increases to D4. At this time, the upper and lower limits of the opening degree of the battery electronic expansion valve 3 are d7-d8 (preferably 250-480, unit is B, i.e. step). When the battery temperature of the battery pack 5 drops to the lowest value, the battery management system (BMS) sends "non-charging mode" and "non-cooling mode" signals, and the whole vehicle exits the battery rapid cooling control system and enters the normal control stage.

[0103] In the solution of this invention, there is no control action for the single-use air conditioning cooling mode, and it operates according to the normal vehicle control system.

[0104] Figure 8 This is a schematic diagram of the temperature range in a device for controlling rapid battery cooling in an integrated liquid-cooled air conditioning system for a pure electric bus according to the present invention. Figure 8 In this context, Tlo is the outlet water temperature of plate heat exchanger 7, Ts is the initial set temperature of battery pack 5, and A is a preset value. When entering zone B from zone A, the outlet water temperature Tlo of plate heat exchanger 7 is less than the initial set temperature Ts of battery pack 5. When entering zone A from zone B, the outlet water temperature Tlo of plate heat exchanger 7 is greater than or equal to the initial set temperature Ts of battery pack 5 plus the preset value A. For example: In Figure 8 In the example shown, the initial set temperature Ts of battery pack 5 can be 17°C, and the preset value A can be 2°C. The line segment between the initial set temperature Ts of battery pack 5 and the initial set temperature Ts + preset value A of battery pack 5 can represent the transition process of the opening degree of battery electronic expansion valve 3 from the range d1-d2 of opening degree D1 to the range d3-d4 of opening degree D2. (Refer to...) Figure 6 and Figure 8 As shown in the example, during the operation or charging of a pure electric bus, when the temperature of the battery of the pure electric bus reaches a certain temperature value set in the program, the temperature sensor on the battery side of the pure electric bus sends a signal that the temperature of the battery of the pure electric bus has reached a certain temperature value set in the program, which is the demand signal from the battery cooling system of the pure electric bus.

[0105] The present invention achieves rapid cooling by increasing the upper and lower limits of the opening of the battery electronic expansion valve 3 when the battery (such as battery pack 5) of the pure electric bus needs to be cooled. In this way, by changing the upper and lower limits of the opening of the battery electronic expansion valve 3 of the pure electric bus, the opening size of the battery electronic expansion valve 3 of the pure electric bus is adjusted, thereby achieving rapid cooling of the battery of the pure electric bus. This ensures that the battery of the pure electric bus quickly has a normal working environment during fast charging and operation.

[0106] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0107] By employing the technical solution of this invention, an integrated liquid-cooled air conditioning system for pure electric buses is implemented in two modes: a simultaneous start-up mode where the air conditioning and battery of the pure electric bus are activated to cool both the passenger compartment and the battery; and a separate start-up mode where the battery is used to cool the battery. In this mode, the air conditioning system controls the upper and lower limits of the battery electronic expansion valve opening based on the demand signal received from the battery cooling system. This increases the opening of the battery electronic expansion valve, rapidly cooling the battery without affecting the cooling demand of the passenger compartment. This achieves rapid and effective cooling of the battery, ensuring that it quickly reaches a normal operating environment during fast charging and operation, thereby extending the battery's lifespan.

[0108] According to an embodiment of the present invention, an integrated liquid-cooled air conditioning system for a pure electric bus is also provided, corresponding to a control device for an integrated liquid-cooled air conditioning system for a pure electric bus. This integrated liquid-cooled air conditioning system for a pure electric bus may include: the control device for the integrated liquid-cooled air conditioning system for a pure electric bus described above.

[0109] Since the processing and functions implemented by the integrated liquid-cooled air conditioning system of the pure electric bus in this embodiment are basically the same as those of the aforementioned device embodiments, principles and examples, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0110] By employing the technical solution of this invention, an integrated liquid-cooled air conditioning system for pure electric buses is implemented in two modes: a simultaneous start-up mode where the air conditioning and battery of the pure electric bus are activated to cool both the passenger compartment and the battery; and a separate start-up mode where the battery is used to cool the battery. In this mode, the air conditioning system controls the upper and lower limits of the battery electronic expansion valve opening based on the demand signal received from the battery cooling system. This increases the opening of the battery electronic expansion valve, rapidly cooling the battery without affecting the cooling demand of the passenger compartment. This achieves rapid and effective cooling of the pure electric bus battery, ensuring that the battery quickly reaches a normal operating environment during fast charging and operation.

[0111] According to an embodiment of the present invention, a storage medium is also provided for a control method corresponding to an integrated liquid-cooled air conditioning system for a pure electric bus. The storage medium includes a stored program, wherein, when the program is executed, the device where the storage medium is located controls the execution of the control method for the integrated liquid-cooled air conditioning system of the pure electric bus described above.

[0112] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0113] By employing the technical solution of this invention, an integrated liquid-cooled air conditioning system for pure electric buses is implemented in two modes: a simultaneous start-up mode where the air conditioning and battery of the pure electric bus are activated to cool the passenger compartment and the battery simultaneously, and a separate start-up mode where the battery cools the battery independently. In this mode, the air conditioning system controls the upper and lower limits of the battery electronic expansion valve opening based on the demand signal received from the battery cooling system. This increases the opening of the battery electronic expansion valve, rapidly cooling the battery without affecting the cooling demand of the passenger compartment, thereby extending the battery's service life.

[0114] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0115] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for an integrated liquid-cooled air conditioning system of a pure electric bus, characterized in that, The integrated liquid-cooled air conditioning system of the pure electric bus includes: a compressor (1), an external heat exchange unit, an internal heat exchange unit, an air conditioning flow control unit, a battery throttling unit, and a plate heat exchanger (7), as well as an external fan installed at the external heat exchange unit; the plate heat exchanger (7) has a first heat exchange pipeline and a second heat exchange pipeline capable of exchanging heat with each other; the exhaust port of the compressor (1) is divided into two paths after passing through the external heat exchange unit: one path passes through the air conditioning flow control unit and the internal heat exchange unit and then returns to the compressor (1). 1) The intake port of the compressor (1) is connected to the battery throttling unit and the first heat exchange pipeline of the plate heat exchanger (7), and then returns to the intake port of the compressor (1); the second heat exchange pipeline of the plate heat exchanger (7) can exchange heat with the battery of the pure electric bus; wherein, the compressor (1), the external heat exchange unit and the external fan are used together for the air conditioning system and the battery liquid cooling system in the integrated liquid cooling air conditioning system of the pure electric bus; the control method of the integrated liquid cooling air conditioning system of the pure electric bus includes: After the integrated liquid-cooled air conditioning system of the pure electric bus is turned on, the integrated liquid-cooled air conditioning system of the pure electric bus is controlled to operate in cooling mode. Obtain the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus, obtain the outlet water temperature of the plate heat exchanger (7), and obtain the battery temperature of the pure electric bus as the battery temperature of the pure electric bus. Based on the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus, determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus. Based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in combination with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus are controlled, and the opening degree of the air conditioning flow control unit and the battery throttling unit is adjusted; based on the demand signal received from the battery cooling system of the pure electric bus, the upper and lower limits of the opening degree of the battery electronic expansion valve are controlled respectively, so that the opening degree of the battery electronic expansion valve is increased, and the battery is rapidly cooled without affecting the cooling demand of the passenger cabin.

2. The control method for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 1, characterized in that, in, The current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is: the first cooling demand when the integrated liquid-cooled air conditioning system of the pure electric bus receives a cooling command, or the second cooling demand when the battery of the pure electric bus is charging or the ambient temperature inside the vehicle is lower than the set temperature; the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a joint cooling mode in which the air conditioning system and the battery liquid cooling system work simultaneously, or a separate cooling mode in which the air conditioning system is not working and the battery liquid cooling system works alone. Based on the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus, determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, including: Determine whether the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand or the second cooling demand; If the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand, then the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the common cooling mode. If the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the second cooling demand, then the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the standalone cooling mode.

3. The control method for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 1 or 2, characterized in that, Based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus are controlled, and the opening degree of the air conditioning flow control unit and the battery throttling unit is adjusted, including: When the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is the common cooling mode in which the air conditioning system and the battery liquid-cooled system work simultaneously, the compressor (1) is controlled not to start, the external fan is controlled to start and run, the opening degree of the battery throttling unit is controlled to increase to the first set opening degree, and the opening degree of the air conditioning flow regulating unit is controlled to increase to the second set opening degree; wherein, the first set opening degree and the second set opening degree are both within the range of the first set opening degree; After the first set time period, if it is determined that the outlet water temperature of the plate heat exchanger (7) has risen to the first temperature range and a cooling signal requiring the battery to be cooled is received from the BMS of the battery of the pure electric bus, then the opening degree of the battery throttling unit is adjusted from the first set opening degree to the third set opening degree; wherein, the third set opening degree is within the range of the second set opening degree; the lower limit of the second set opening degree range is greater than the upper limit of the first set opening degree range.

4. The control method for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 3, characterized in that, The second set opening range includes a first opening interval, a second opening interval, and a third opening interval. The lower limit of the first opening interval is greater than or equal to the lower limit of the second set opening range, the upper limit of the first opening interval is less than or equal to the lower limit of the second opening interval, the upper limit of the second opening interval is greater than the lower limit of the third opening interval, and the upper limit of the third opening interval is greater than the upper limit of the second opening interval and less than or equal to the upper limit of the second set opening range. Based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus are controlled, and the opening degree of the air conditioning flow control unit and the battery throttling unit is adjusted, further including: If the opening degree of the battery throttling unit has risen to the second opening degree range after passing through the first opening degree range in the second set opening degree range, and continues to rise and finally stabilizes at the third opening degree range in the second set opening degree range, after the second set time period, if it is determined that the outlet water temperature of the plate heat exchanger (7) has dropped to the second temperature range, and a non-charging signal from the BMS of the battery of the pure electric bus indicating that the battery is not being charged is received, then the opening degree of the battery throttling unit is adjusted to decrease from the third set opening degree to the first set opening degree. The upper limit of the second temperature range is less than or equal to the lower limit of the first temperature range.

5. The control method for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 1 or 2, characterized in that, Based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus are controlled, and the opening degree of the air conditioning flow control unit and the battery throttling unit is adjusted, further including: When the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a separate cooling mode in which the air conditioning system is not working and the battery liquid cooling system is working alone, the opening degree of the battery throttling unit is increased to the fourth set opening degree, and the air conditioning throttling unit is closed; wherein, the fourth set opening degree is within the range of the third set opening degree. After the third set time period, if it is determined that the battery temperature of the pure electric bus has risen to the set maximum temperature and a charging signal is received from the BMS of the pure electric bus indicating that the battery is being charged, then the opening degree of the battery throttling unit is adjusted from the fourth set opening degree to the fifth set opening degree; wherein, the fifth set opening degree is within the range of the fourth set opening degree, the lower limit of the fourth set opening degree range is greater than the lower limit of the third set opening degree range, and the upper limit of the fourth set opening degree range is equal to the upper limit of the third set opening degree range; Until the battery temperature of the pure electric bus drops to the set minimum temperature, and a signal is received from the battery management system (BMS) of the pure electric bus indicating that the battery is not being charged and not being cooled, the opening degree of the battery throttling unit is adjusted from the fifth set opening degree to the fourth set opening degree.

6. A control device for an integrated liquid-cooled air conditioning system of a pure electric bus, controlled by the control method for an integrated liquid-cooled air conditioning system of a pure electric bus as described in any one of claims 1 to 5, characterized in that, The integrated liquid-cooled air conditioning system of the pure electric bus includes: a compressor (1), an external heat exchange unit, an internal heat exchange unit, an air conditioning flow control unit, a battery throttling unit, and a plate heat exchanger (7), as well as an external fan installed at the external heat exchange unit; the plate heat exchanger (7) has a first heat exchange pipeline and a second heat exchange pipeline capable of exchanging heat with each other; the exhaust port of the compressor (1) is divided into two paths after passing through the external heat exchange unit: one path passes through the air conditioning flow control unit and the internal heat exchange unit and then returns to the compressor (1). 1) The intake port of the compressor (1) is connected to the battery throttling unit and the first heat exchange pipeline of the plate heat exchanger (7), and then returns to the intake port of the compressor (1); the second heat exchange pipeline of the plate heat exchanger (7) can exchange heat with the battery of the pure electric bus; wherein, the compressor (1), the external heat exchange unit and the external fan are used together for the air conditioning system and the battery liquid cooling system in the integrated liquid cooling air conditioning system of the pure electric bus; the control device of the integrated liquid cooling air conditioning system of the pure electric bus includes: The control unit is configured to control the integrated liquid-cooled air conditioning system of the pure electric bus to operate in cooling mode after the integrated liquid-cooled air conditioning system of the pure electric bus is turned on. The acquisition unit is configured to acquire the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus, acquire the outlet water temperature of the plate heat exchanger (7), and acquire the battery temperature of the pure electric bus as the battery temperature of the pure electric bus. The control unit is further configured to determine the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus based on the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus. The control unit is also configured to control the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid cooling air conditioning system of the pure electric bus according to the current working mode of the integrated liquid cooling air conditioning system of the pure electric bus, and in combination with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, and to adjust the opening degree of the air conditioning flow control unit and the battery throttling unit.

7. The control device for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 6, characterized in that, in, The current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus is: the first cooling demand when the integrated liquid-cooled air conditioning system of the pure electric bus receives a cooling command, or the second cooling demand when the battery of the pure electric bus is charging or the ambient temperature inside the vehicle is lower than the set temperature; the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a joint cooling mode in which the air conditioning system and the battery liquid cooling system work simultaneously, or a separate cooling mode in which the air conditioning system is not working and the battery liquid cooling system works alone. The control unit determines the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus based on the current cooling demand of the system, including: Determine whether the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand or the second cooling demand; If the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the first cooling demand, then the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the common cooling mode. If the current cooling demand of the integrated liquid-cooled air conditioning system of the pure electric bus belongs to the second cooling demand, then the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is determined to be the standalone cooling mode.

8. The control device for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 6 or 7, characterized in that, The control unit, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit, including: When the current working mode of the integrated liquid-cooled air conditioning system of the pure electric bus is the common cooling mode in which the air conditioning system and the battery liquid-cooled system work simultaneously, the compressor (1) is controlled not to start, the external fan is controlled to start and run, the opening degree of the battery throttling unit is controlled to increase to the first set opening degree, and the opening degree of the air conditioning flow regulating unit is controlled to increase to the second set opening degree; wherein, the first set opening degree and the second set opening degree are both within the range of the first set opening degree; After the first set time period, if it is determined that the outlet water temperature of the plate heat exchanger (7) has risen to the first temperature range and a cooling signal requiring the battery to be cooled is received from the BMS of the battery of the pure electric bus, then the opening degree of the battery throttling unit is adjusted from the first set opening degree to the third set opening degree; wherein, the third set opening degree is within the range of the second set opening degree; the lower limit of the second set opening degree range is greater than the upper limit of the first set opening degree range.

9. The control device for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 8, characterized in that, The second set opening range includes a first opening interval, a second opening interval, and a third opening interval. The lower limit of the first opening interval is greater than or equal to the lower limit of the second set opening range, the upper limit of the first opening interval is less than or equal to the lower limit of the second opening interval, the upper limit of the second opening interval is greater than the lower limit of the third opening interval, and the upper limit of the third opening interval is greater than the upper limit of the second opening interval and less than or equal to the upper limit of the second set opening range. The control unit, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit, and further includes: If the opening degree of the battery throttling unit has risen to the second opening degree range after passing through the first opening degree range in the second set opening degree range, and continues to rise and finally stabilizes at the third opening degree range in the second set opening degree range, after the second set time period, if it is determined that the outlet water temperature of the plate heat exchanger (7) has dropped to the second temperature range, and a non-charging signal from the BMS of the battery of the pure electric bus indicating that the battery is not being charged is received, then the opening degree of the battery throttling unit is adjusted to decrease from the third set opening degree to the first set opening degree. The upper limit of the second temperature range is less than or equal to the lower limit of the first temperature range.

10. The control device for the integrated liquid-cooled air conditioning system of a pure electric bus according to claim 6 or 7, characterized in that, The control unit, based on the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus, and in conjunction with the outlet water temperature of the plate heat exchanger (7) and / or the battery temperature of the pure electric bus, controls the opening and closing of the air conditioning system and the battery liquid cooling system in the integrated liquid-cooled air conditioning system of the pure electric bus, and adjusts the opening degree of the air conditioning flow control unit and the battery throttling unit, and further includes: When the current operating mode of the integrated liquid-cooled air conditioning system of the pure electric bus is a separate cooling mode in which the air conditioning system is not working and the battery liquid cooling system is working alone, the opening degree of the battery throttling unit is increased to the fourth set opening degree, and the air conditioning throttling unit is closed; wherein, the fourth set opening degree is within the range of the third set opening degree. After the third set time period, if it is determined that the battery temperature of the pure electric bus has risen to the set maximum temperature and a charging signal is received from the BMS of the pure electric bus indicating that the battery is being charged, then the opening degree of the battery throttling unit is adjusted from the fourth set opening degree to the fifth set opening degree; wherein, the fifth set opening degree is within the range of the fourth set opening degree, the lower limit of the fourth set opening degree range is greater than the lower limit of the third set opening degree range, and the upper limit of the fourth set opening degree range is equal to the upper limit of the third set opening degree range; Until the battery temperature of the pure electric bus drops to the set minimum temperature, and a signal is received from the battery management system (BMS) of the pure electric bus indicating that the battery is not being charged and not being cooled, the opening degree of the battery throttling unit is adjusted from the fifth set opening degree to the fourth set opening degree.

11. An integrated liquid-cooled air conditioning system for a pure electric bus, characterized in that, include: The control device for the integrated liquid-cooled air conditioning system of a pure electric bus as described in any one of claims 6 to 10.

12. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method of the integrated liquid-cooled air conditioning system of the pure electric bus according to any one of claims 1 to 5.

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