New energy heavy truck integrated cooling system control method based on fuzzy control

Abstract

The invention provides a new energy heavy truck integrated cooling system control method based on fuzzy control, and the system comprises a two-input two-output fuzzy controller which inputs the superheat degree of an evaporator outlet of a passenger compartment loop and the temperature of a battery cooling liquid, and the controller integrates the superheat degree and the temperature of the cooling liquid to control a target. And reasoning and outputting throttle valve opening degrees of a passenger compartment loop and a battery cooling loop according to a fuzzy rule. The fuzzy controller carries out dynamic refrigerant flow control on a passenger compartment loop and a battery pack loop in complex and diverse operation working conditions, the refrigerant flow distribution proportion is adjusted in a self-adaptive mode according to the refrigeration requirement, and it is guaranteed that the system meets the battery temperature safety and passenger compartment comfort control requirement in real time. The balance and robustness of temperature control of the integrated cooling system can be improved, and the cooling performance of the system is comprehensively improved.

Description

Technical Field

[0001] The present invention is a control method for an integrated cooling system of a new energy heavy truck based on fuzzy control, and relates to the technical field of thermal management of new energy commercial vehicles. Background Art

[0002] New energy commercial vehicles have broad application prospects in reducing environmental pollution and energy consumption. New energy heavy trucks in new energy commercial vehicles need to be equipped with large-capacity battery packs to provide power. When carrying heavy cargo, climbing or accelerating, the high heat generation characteristics of large-capacity battery packs cause the refrigeration system to be in a high heat load state. Under the conditions of high heat generation of batteries and high heat load of the environment, the thermal management system faces the technical challenge of balancing battery safety and passenger compartment comfort. High-precision thermal management control algorithms are one of the key elements to ensure the safe and comfortable operation of new energy commercial vehicles.

[0003] Existing integrated cooling systems usually use the logic of independently controlling the passenger compartment temperature and battery pack temperature. The passenger compartment circuit refrigerant flow is independently controlled according to the evaporator outlet superheat using proportional-integral-differential negative feedback regulation, and the battery circuit refrigerant flow is independently controlled according to the battery inlet coolant temperature using proportional-integral-differential negative feedback regulation. This control logic that only considers the temperature or superheat of the circuit cannot achieve dynamic optimization and allocation of multi-circuit refrigerant flow according to real-time environmental factors, and thus cannot meet the comprehensive control requirements of battery pack temperature safety and passenger compartment temperature comfort. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a new energy heavy truck integrated cooling system control method based on fuzzy control to solve the multi-circuit refrigerant flow control problem existing in the prior art. The technical solution provided by the present invention can obtain the throttle valve opening by real-time fuzzy reasoning according to the dynamic cooling requirements of the passenger compartment and the battery pack, and realize the precise distribution of the refrigerant flow. The specific technical solution is as follows:

[0005] A control method for an integrated cooling system of a new energy heavy truck based on fuzzy control, comprising: The fuzzy controller receives the passenger compartment circuit evaporator outlet superheat and the battery cooling circuit coolant temperature; The input parameters of the two are fuzzy processed according to the membership function; The fuzzy output parameters of the throttle valve opening of the passenger compartment circuit and the battery circuit are obtained according to the fuzzy rules; After defuzzification, the fuzzy controller outputs the throttle valve opening of the passenger compartment circuit and the throttle valve opening of the battery cooling circuit to achieve refrigerant flow control.

[0006] Preferably, the superheat degree at the evaporator outlet of the passenger compartment circuit is obtained by collecting the reading of the evaporator outlet sensor and calculating; the coolant temperature of the battery cooling circuit is obtained by collecting the reading of the battery coolant inlet sensor.

[0007] Preferably, the membership function for fuzzy processing of input parameters and output parameters is an optimization function based on triangle, trapezoid and bell-shaped basic membership functions, and the membership function is adjusted by a negative feedback regulation method.

[0008] Preferably, in the fuzzy controller, the fuzzy rule for controlling the throttle valve opening of the passenger compartment circuit is: When the value of the passenger compartment circuit evaporator outlet superheat Te belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M, the relatively high fuzzy subset AH or the high fuzzy subset H, and the value of the battery cooling circuit coolant temperature belongs to the low fuzzy subset L or the relatively low fuzzy subset AL, the passenger compartment circuit throttle valve opening belongs to the fuzzy subset corresponding to the passenger compartment circuit evaporator outlet superheat Te; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, then the throttle valve opening of the passenger compartment circuit belongs to the high fuzzy subset AH; when the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, the throttle valve opening of the passenger compartment circuit belongs to the fuzzy subset corresponding to the superheat Te at the evaporator outlet of the passenger compartment circuit; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, then the throttle valve opening of the passenger compartment circuit belongs to the corresponding medium fuzzy subset M or the high fuzzy subset AH; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, and the throttle valve opening of the passenger compartment circuit belongs to the high fuzzy subset AH; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset L; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the passenger compartment circuit belongs to the medium fuzzy subset AM; If the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M or the relatively high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset L; if the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H, and the throttle valve opening of the passenger compartment circuit belongs to the relatively low fuzzy subset AL.

[0009] Furthermore, in the fuzzy controller, the fuzzy rule for controlling the throttle valve opening of the battery cooling circuit is: The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M, the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset L, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset L; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M or the high fuzzy subset AH, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset AL, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset AL, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset L; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM or the medium fuzzy subset M, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM or the medium fuzzy subset M, and the throttle valve opening of the battery cooling circuit belongs to the medium fuzzy subset M; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM or the medium fuzzy subset M, and the throttle valve opening of the battery cooling circuit belongs to the medium fuzzy subset AM; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset H; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset AH; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M, the relatively high fuzzy subset AH or the high fuzzy subset H. The value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H. The throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset H.

[0010] Furthermore, when the fuzzy controller monitors that the coolant temperature of the battery cooling circuit belongs to a relatively high fuzzy subset or a high fuzzy subset, the throttle valve opening of the passenger compartment circuit outputs a medium fuzzy subset, a relatively low fuzzy subset, and a low fuzzy subset value, and the battery temperature is controlled preferentially to ensure system safety; at the same time, when the fuzzy controller monitors that the superheat of the evaporator outlet of the passenger compartment circuit belongs to a relatively high fuzzy subset or a high fuzzy subset, the fuzzy controller reduces the coolant flow of the battery cooling circuit, and the throttle valve opening of the battery cooling circuit is reduced from the high fuzzy subset to the relatively high fuzzy subset.

[0011] Preferably, the integrated cooling system includes a radiator assembly module, a passenger compartment cooling module, and a battery indirect cooling module. The passenger compartment cooling module and the battery indirect cooling module are connected in parallel to the radiator assembly module. The passenger compartment cooling module and the battery indirect cooling module are both connected to a fuzzy controller.

[0012] Furthermore, the radiator assembly module includes a condenser, a liquid storage tank and an outdoor fan, the passenger compartment cooling module includes an evaporator, a passenger compartment circuit throttle valve and an indoor fan, and the battery indirect cooling module includes a water pump, a plate heat exchanger and a battery cooling circuit throttle valve; the condenser outlet is connected to the liquid storage tank, the condenser inlet is connected to the compressor, the compressor inlet is connected to the drying tank, the evaporator inlet is connected to the passenger compartment circuit throttle valve, the passenger compartment circuit throttle valve inlet is connected to the liquid storage tank outlet, the plate heat exchanger inlet is connected to the battery cooling circuit throttle valve, the battery cooling circuit throttle valve inlet is connected to the liquid storage tank outlet, and the evaporator and plate heat exchanger outlets are both connected to the drying tank; the plate heat exchanger forms a coolant circuit with the water pump, water tank and battery.

[0013] Furthermore, the fuzzy controller is connected to a passenger compartment circuit throttle valve, a battery cooling circuit throttle valve, an evaporator outlet sensor and a battery coolant inlet sensor.

[0014] Furthermore, the evaporator outlet sensor is used to monitor the evaporation pressure and temperature, and the battery coolant inlet sensor is used to monitor the coolant temperature.

[0015] The integrated cooling system of the present invention comprises a two-input and two-output fuzzy controller, which inputs the superheat of the passenger compartment evaporator outlet and the battery coolant temperature. The fuzzy controller comprehensively infers and outputs the throttle valve openings of the two circuits. The control logic, membership function range, design principle and fuzzy rules of the fuzzy controller are disclosed, which solves the problem of refrigerant flow distribution of the integrated cooling system, can meet the flow distribution requirements of the integrated cooling system under different working conditions, improve the system control accuracy, and meet the optimization requirements of economic performance and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a system principle diagram of the integrated cooling system of the new energy heavy truck based on fuzzy control of the present invention.

[0017] Figure 2 It is a schematic diagram of the membership function of the superheat Te at the outlet of the passenger compartment circuit evaporator of the present invention.

[0018] Figure 3 It is a schematic diagram of the membership function of the battery circuit throttle valve opening of the present invention.

[0019] Figure 4 It is a schematic diagram of the fuzzy rules for the throttle valve opening control of the passenger compartment circuit of the present invention.

[0020] Figure 5 It is a schematic diagram of the fuzzy rule for controlling the throttle valve opening of the battery cooling circuit of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] A control method for an integrated cooling system of a new energy heavy truck based on fuzzy control, comprising: The fuzzy controller 9 receives the superheat of the evaporator outlet of the passenger compartment circuit and the coolant temperature of the battery cooling circuit; The input parameters of the two are fuzzy processed according to the membership function; The fuzzy output parameters of the throttle valve opening of the passenger compartment circuit and the battery circuit are obtained by comprehensive reasoning based on fuzzy rules; After defuzzification, the fuzzy controller 9 outputs the throttle valve opening of the passenger compartment circuit and the throttle valve opening of the battery cooling circuit to achieve refrigerant flow control. The multi-input and multi-output fuzzy controller can perform fuzzy reasoning based on the superheat of the passenger compartment evaporator outlet and the battery coolant temperature, effectively solving the refrigerant flow distribution problem of the integrated cooling system of new energy heavy trucks, ensuring the balance of temperature control, and improving the cooling performance of the system.

[0023] Specifically, the superheat of the passenger compartment circuit evaporator outlet is obtained by collecting the reading of the evaporator outlet sensor 8 and calculating; the coolant temperature of the battery cooling circuit is obtained by collecting the reading of the battery coolant inlet sensor 15.

[0024] Furthermore, the membership function for fuzzy processing of input parameters and output parameters is an optimization function based on the basic membership functions of triangle, trapezoid and bell, which is adjusted and improved according to the actual effect of system feedback, and the membership function adjustment adopts the negative feedback regulation method.

[0025] like Figure 4 As shown, in the fuzzy controller 9, the throttle valve opening of the passenger compartment circuit The control fuzzy rules are shown in Table 1: Table 1: Throttle valve opening of passenger compartment circuit Control fuzzy rule table ; Among them, Te represents the superheat of the evaporator outlet of the passenger compartment circuit, Tc represents the coolant temperature of the battery cooling circuit, L represents that the value belongs to the low fuzzy subset, AL represents that the value belongs to the relatively low fuzzy subset, AM represents that the value belongs to the relatively medium fuzzy subset, M represents that the value belongs to the medium fuzzy subset, AH represents that the value belongs to the relatively high fuzzy subset, and H represents that the value belongs to the high fuzzy subset.

[0026] When the value of the passenger compartment circuit evaporator outlet superheat Te belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M, the relatively high fuzzy subset AH or the high fuzzy subset H, and the value of the battery cooling circuit coolant temperature belongs to the low fuzzy subset L or the relatively low fuzzy subset AL, the passenger compartment circuit throttle valve opening belongs to the fuzzy subset corresponding to the passenger compartment circuit evaporator outlet superheat Te; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, then the throttle valve opening of the passenger compartment circuit belongs to the high fuzzy subset AH; when the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, the throttle valve opening of the passenger compartment circuit belongs to the fuzzy subset corresponding to the superheat Te at the evaporator outlet of the passenger compartment circuit; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, then the throttle valve opening of the passenger compartment circuit belongs to the corresponding medium fuzzy subset M or the high fuzzy subset AH; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, and the throttle valve opening of the passenger compartment circuit belongs to the high fuzzy subset AH; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset L; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the passenger compartment circuit belongs to the medium fuzzy subset AM; If the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M or the relatively high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset L; if the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H, and the throttle valve opening of the passenger compartment circuit belongs to the relatively low fuzzy subset AL.

[0027] In the passenger compartment circuit throttle valve opening control fuzzy rules, the passenger compartment circuit flow distribution priority is lower than the battery cooling circuit. When the evaporator outlet superheat and the battery coolant temperature belong to the H fuzzy subset, the fuzzy controller 9 increases the passenger compartment flow distribution from the L fuzzy subset to the AL fuzzy subset; when the battery coolant temperature belongs to the M fuzzy subset or below, the fuzzy controller 9 integrates the system refrigeration capacity to meet the evaporator outlet superheat regulation requirements.

[0028] like Figure 5 As shown, in the fuzzy controller 9, the battery cooling circuit throttle valve opening The control fuzzy rules are shown in Table 2: Table 2: Battery cooling circuit throttle valve opening Control fuzzy rule table ; Among them, L means that the value belongs to the low fuzzy subset, AL means that the value belongs to the relatively low fuzzy subset, AM means that the value belongs to the relatively medium fuzzy subset, M means that the value belongs to the medium fuzzy subset, AH means that the value belongs to the relatively high fuzzy subset, and H means that the value belongs to the high fuzzy subset.

[0029] The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M, the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset L, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset L; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M or the high fuzzy subset AH, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset AL, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset AL, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset L; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM or the medium fuzzy subset M, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM or the medium fuzzy subset M, and the throttle valve opening of the battery cooling circuit belongs to the medium fuzzy subset M; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM or the medium fuzzy subset M, and the throttle valve opening of the battery cooling circuit belongs to the medium fuzzy subset AM; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset H; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset AH; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M, the relatively high fuzzy subset AH or the high fuzzy subset H. The value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H. The throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset H.

[0030] Furthermore, in the fuzzy rules, when the system is in a high-temperature condition, the cooling capacity of the integrated cooling system is limited, and the refrigerant flow distribution of the battery cooling circuit is at the highest priority; specifically, when the fuzzy controller 9 monitors that the coolant temperature of the battery cooling circuit belongs to a relatively high fuzzy subset or a high fuzzy subset, the throttle valve opening of the passenger compartment circuit outputs a medium fuzzy subset, a relatively low fuzzy subset, and a low fuzzy subset value, and the battery temperature is preferentially controlled to ensure system safety; under this condition, when the fuzzy controller 9 monitors that the superheat of the evaporator outlet of the passenger compartment circuit belongs to a relatively high fuzzy subset or a high fuzzy subset, the fuzzy controller reduces the coolant flow of the battery cooling circuit, and the throttle valve opening of the battery cooling circuit is reduced from the high fuzzy subset to the relatively high fuzzy subset.

[0031] Taking the passenger compartment and battery cooling mode as an example, when the outdoor temperature is 40℃, the indoor ambient temperature is 27℃, the air humidity is 50%, the wind speed is 4m / s, the indoor air volume is 480m³ / h, and the battery heat generation is 8KW, the throttle valve opening of the passenger compartment circuit belongs to the AM fuzzy subset, and the throttle valve opening of the battery cooling circuit belongs to the AH fuzzy subset, which can effectively control the evaporator outlet superheat of 5.62℃ and the battery inlet coolant temperature of 20.05℃.

[0032] like Figure 2As shown, in the embodiment of the present invention, the range of the L subset divided by the membership function of the passenger compartment loop evaporator outlet superheat Te is [0.25, 0.93], the range of the AL subset is [0.87, 2.43], the range of the AM subset is [2.05, 3.7], the range of the M subset is [3.67, 5.47], the range of the AH subset is [5.35, 8.54], and the range of the H subset is [8.05, 12].

[0033] like Figure 3 As shown, in the embodiment of the present invention, the battery cooling circuit throttle valve opening The range of the L subset divided by the membership function is [0, 79], the range of the AL subset is [33, 124], the range of the AM subset is [98, 172], the range of the M subset is [160, 276], the range of the AH subset is [248, 404], and the range of the H subset is [370, 480].

[0034] In the embodiment of the present invention, the range of the L subset divided by the membership function of the battery inlet coolant temperature Tc of the battery cooling circuit is [16.78, 18.5], the range of the AL subset is [18.2, 19.2], the range of the AM subset is [19, 20.2], the range of the M subset is [19.8, 21.7], the range of the AH subset is [21.5, 23.2], and the range of the H subset is [22.8, 25].

[0035] In the embodiment of the present invention, the throttle valve opening of the passenger compartment circuit The range of the L subset divided by the membership function is [0, 86], the range of the AL subset is [35, 182], the range of the AM subset is [133, 248], the range of the M subset is [217, 374], the range of the AH subset is [354, 436], and the range of the H subset is [394, 480].

[0036] like Figure 1 As shown, the integrated cooling system includes a radiator assembly module, a passenger compartment cooling module, and a battery indirect cooling module. The passenger compartment cooling module and the battery indirect cooling module are connected in parallel to the radiator assembly module, and the passenger compartment cooling module and the battery indirect cooling module are both connected to the fuzzy controller 9.

[0037] The radiator assembly module includes a condenser 2, a liquid storage tank 4 and an outdoor fan 3, the passenger compartment cooling module includes an evaporator 7, a passenger compartment circuit throttle valve 5 and an indoor fan 6, and the battery indirect cooling module includes a water pump 12, a plate heat exchanger 11 and a battery cooling circuit throttle valve 10; the outlet of the condenser 2 is connected to the liquid storage tank 4, the inlet of the condenser 2 is connected to the compressor 1, the inlet of the compressor 1 is connected to the drying tank 14, the inlet of the evaporator 7 is connected to the passenger compartment circuit throttle valve 5, the inlet of the passenger compartment circuit throttle valve 5 is connected to the outlet of the liquid storage tank 4, the inlet of the plate heat exchanger 11 is connected to the battery cooling circuit throttle valve 10, the inlet of the battery cooling circuit throttle valve 10 is connected to the outlet of the liquid storage tank 4, and the outlets of the evaporator 7 and the plate heat exchanger 11 are both connected to the drying tank 14; the plate heat exchanger 11 forms a coolant circuit with the water pump 12, the water tank 13 and the battery 16, and the water tank 13 is used to replenish the coolant.

[0038] The compressor 1, the condenser 2, the outdoor fan 3, the liquid storage tank 4, the passenger compartment circuit throttle valve 5, the indoor fan 6, the evaporator 7, the battery circuit throttle valve 10, the plate heat exchanger 11 and the drying tank 14 form a refrigerant circulation loop; the battery 16, the water pump 12, the water tank 13, the plate heat exchanger 11 form a battery coolant circulation loop.

[0039] The fuzzy controller 9 is connected to the passenger compartment circuit throttle 5, the battery cooling circuit throttle 10, the evaporator outlet sensor 8 and the battery coolant inlet sensor 15. The fuzzy controller 9 has the evaporator outlet superheat value and the battery inlet coolant temperature value as inputs, and the throttle opening value of the passenger compartment circuit and the battery cooling circuit throttle opening value as outputs. The evaporator outlet sensor 8 is used to monitor the evaporation pressure and temperature, and the battery coolant inlet sensor 15 is used to monitor the coolant temperature.

[0040] When the integrated cooling system of the new energy heavy truck is in the passenger compartment and battery cooling mode, the passenger compartment circuit throttle valve 5 and the battery cooling circuit throttle valve 10 are both open, and the fuzzy controller 9 is a two-input, two-output controller; when the integrated cooling system of the new energy heavy truck is in the passenger compartment cooling mode only, the passenger compartment circuit throttle valve 5 is open, the battery cooling circuit throttle valve 10 is closed, and the fuzzy controller 9 is a single-input, single-output controller; when the integrated cooling system of the new energy heavy truck is in the battery cooling mode only, the passenger compartment circuit throttle valve 5 is closed, the battery cooling circuit throttle valve 10 is open, and the fuzzy controller 9 is a single-input, single-output controller. The fuzzy controller 9 combines the superheat of the passenger compartment circuit evaporator outlet and the coolant temperature of the battery cooling circuit to perform coupled optimization control, optimize the refrigerant flow distribution and system refrigeration performance, realize accurate real-time dynamic control, adjust the refrigerant flow distribution ratio in real time according to the refrigeration demand, optimize the refrigerant flow distribution of the integrated cooling system, and improve the system control accuracy and cooling performance.

[0041] The present invention is applicable to the integrated cooling system of new energy heavy trucks with high-power battery heat generation characteristics, can optimize the system multi-channel refrigerant flow distribution ratio, and is applicable to multi-condition system adaptive adjustment. Especially for extreme working conditions in high temperature environments, it can effectively realize the competitive distribution of refrigerant flow between the battery circuit and the passenger compartment circuit, taking into account the battery temperature safety and the passenger compartment temperature comfort, improving the system temperature control accuracy and robustness, and comprehensively improving the system cooling performance. The present invention is not only applicable to new energy heavy trucks, but also to other types of new energy commercial vehicles, and has a wide range of applications.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for an integrated cooling system of a new energy heavy truck based on fuzzy control, characterized in that: include: The fuzzy controller receives the passenger compartment circuit evaporator outlet superheat and the battery cooling circuit coolant temperature; The input parameters of the two are fuzzy processed according to the membership function; The fuzzy output parameters of the throttle valve opening of the passenger compartment circuit and the battery circuit are obtained according to the fuzzy rules; After defuzzification, the fuzzy controller outputs the throttle valve opening of the passenger compartment circuit and the throttle valve opening of the battery cooling circuit to achieve refrigerant flow control.

2. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 1 is characterized in that: The superheat of the evaporator outlet of the passenger compartment circuit is obtained by collecting the reading of the evaporator outlet sensor and calculating; the coolant temperature of the battery cooling circuit is obtained by collecting the reading of the battery coolant inlet sensor.

3. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 1 is characterized in that: The membership function for fuzzy processing of input parameters and output parameters is an optimization function based on a triangle, trapezoid or bell-shaped basic membership function, and the membership function is adjusted by a negative feedback regulation method.

4. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 1 is characterized in that: In the fuzzy controller, the fuzzy rule for the throttle valve opening control of the passenger compartment circuit is: When the value of the passenger compartment circuit evaporator outlet superheat Te belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M, the relatively high fuzzy subset AH or the high fuzzy subset H, and the value of the battery cooling circuit coolant temperature belongs to the low fuzzy subset L or the relatively low fuzzy subset AL, the passenger compartment circuit throttle valve opening belongs to the fuzzy subset corresponding to the passenger compartment circuit evaporator outlet superheat Te; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, then the throttle valve opening of the passenger compartment circuit belongs to the high fuzzy subset AH; when the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM, the throttle valve opening of the passenger compartment circuit belongs to the fuzzy subset corresponding to the superheat Te at the evaporator outlet of the passenger compartment circuit; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, then the throttle valve opening of the passenger compartment circuit belongs to the corresponding medium fuzzy subset M or the high fuzzy subset AH; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset M, and the throttle valve opening of the passenger compartment circuit belongs to the high fuzzy subset AH; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset L; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the medium fuzzy subset M or the high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the passenger compartment circuit belongs to the medium fuzzy subset AM; If the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M or the relatively high fuzzy subset AH, and the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H, then the throttle valve opening of the passenger compartment circuit belongs to the low fuzzy subset L; if the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H, and the throttle valve opening of the passenger compartment circuit belongs to the relatively low fuzzy subset AL.

5. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 4 is characterized in that: In the fuzzy controller, the fuzzy rule for controlling the throttle valve opening of the battery cooling circuit is: The value of the passenger compartment circuit evaporator outlet superheat Te belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M, the high fuzzy subset AH or the high fuzzy subset H, the value of the battery cooling circuit coolant temperature belongs to the low fuzzy subset L, and the battery cooling circuit throttle valve opening belongs to the low fuzzy subset L; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM, the medium fuzzy subset M or the high fuzzy subset AH, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset AL, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset AL; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the low fuzzy subset AL, and the throttle valve opening of the battery cooling circuit belongs to the low fuzzy subset L; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL, the medium fuzzy subset AM or the medium fuzzy subset M, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM or the medium fuzzy subset M, and the throttle valve opening of the battery cooling circuit belongs to the medium fuzzy subset M; the value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the medium fuzzy subset AM or the medium fuzzy subset M, and the throttle valve opening of the battery cooling circuit belongs to the medium fuzzy subset AM; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the low fuzzy subset AL or the medium fuzzy subset AM, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset H; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset AH or the high fuzzy subset H, the value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset AH, and the throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset AH; The value of the superheat Te at the evaporator outlet of the passenger compartment circuit belongs to the low fuzzy subset L, the relatively low fuzzy subset AL, the relatively medium fuzzy subset AM, the medium fuzzy subset M, the relatively high fuzzy subset AH or the high fuzzy subset H. The value of the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset H. The throttle valve opening of the battery cooling circuit belongs to the high fuzzy subset H.

6. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 5 is characterized in that: When the fuzzy controller monitors that the coolant temperature of the battery cooling circuit belongs to the high fuzzy subset or the high fuzzy subset, the throttle valve opening of the passenger compartment circuit outputs the medium fuzzy subset, the low fuzzy subset, and the low fuzzy subset values, and the battery temperature is controlled preferentially to ensure the safety of the system; at the same time, when the fuzzy controller monitors that the superheat of the evaporator outlet of the passenger compartment circuit belongs to the high fuzzy subset or the high fuzzy subset, the fuzzy controller reduces the coolant flow of the battery cooling circuit, and the throttle valve opening of the battery cooling circuit is reduced from the high fuzzy subset to the high fuzzy subset.

7. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 1 is characterized in that: The integrated cooling system includes a radiator assembly module, a passenger compartment cooling module, and a battery indirect cooling module. The passenger compartment cooling module and the battery indirect cooling module are connected in parallel to the radiator assembly module. The passenger compartment cooling module and the battery indirect cooling module are both connected to a fuzzy controller.

8. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 7 is characterized in that: The radiator assembly module includes a condenser, a liquid storage tank and an outdoor fan, the passenger compartment cooling module includes an evaporator, a passenger compartment circuit throttle valve and an indoor fan, and the battery indirect cooling module includes a water pump, a plate heat exchanger and a battery cooling circuit throttle valve; the condenser outlet is connected to the liquid storage tank, the condenser inlet is connected to the compressor, the compressor inlet is connected to the drying tank, the evaporator inlet is connected to the passenger compartment circuit throttle valve, the passenger compartment circuit throttle valve inlet is connected to the liquid storage tank outlet, the plate heat exchanger inlet is connected to the battery cooling circuit throttle valve, the battery cooling circuit throttle valve inlet is connected to the liquid storage tank outlet, and the evaporator and plate heat exchanger outlets are both connected to the drying tank; the plate heat exchanger forms a coolant loop with the water pump, the water tank and the battery.

9. The control method of the integrated cooling system of a new energy heavy truck based on fuzzy control according to claim 8 is characterized in that: The fuzzy controller is connected to a passenger compartment circuit throttle valve, a battery cooling circuit throttle valve, an evaporator outlet sensor, and a battery coolant inlet sensor.

10. The control method of the new energy heavy truck integrated cooling system based on fuzzy control according to claim 9 is characterized in that: The evaporator outlet sensor is used to monitor the evaporation pressure and temperature, and the battery coolant inlet sensor is used to monitor the coolant temperature.

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