Vehicle air conditioning thermal management method and device

Abstract

The present application discloses a vehicle air conditioning thermal management method and device, which relates to the field of thermal management technology. The vehicle air conditioning thermal management method includes the following steps: obtaining the required heating amount; and determining the final heating mode based on the required heating amount, the amount of waste heat, and the energy consumption of different heating modes. By introducing the energy consumption of different heating modes and comparing them, the heating mode with the lowest energy consumption can be selected. Under the condition of the same heating amount, the heating mode with the lowest energy consumption can be selected from multiple heating schemes. This ensures that the entire vehicle operates in the lowest power consumption mode at any water temperature, reduces energy waste, improves thermal management efficiency, and, for electric vehicles and hybrid vehicles, also increases the cruising range.

Description

Technical Field

[0001] The present application relates to the field of heat management technology, and in particular to a vehicle air conditioning heat management method and device. Background Art

[0002] Cabin heating typically utilizes waste heat from the motor and battery, offering three heating methods: waste heat heating, heat pump heating, and PTC heating. This is typically calculated by comparing the target temperature, T0, with the motor and battery water temperature, T. Different control modes are used for different water temperatures. For example, if T0 < T0, waste heat from the motor and battery is used; if T0 > T0 and T > 60°C, waste heat heating is combined with PTC heating as a supplement; and if T0 > T0 and T < -5°C and T < 60°C, a waste heat heat pump from the motor and battery is used with PTC heating as a supplement. This crude control method easily wastes energy and is not conducive to energy conservation and consumption reduction. Summary of the Invention

[0003] The present application provides a vehicle air conditioning thermal management method and device to solve the existing problem of energy waste and disadvantages in energy saving and consumption reduction.

[0004] In a first aspect, the present application provides a vehicle air conditioning thermal management method, comprising the following steps:

[0005] Get the required heating amount;

[0006] The final heating mode is determined based on the required heating amount, waste heat and energy consumption of different heating modes.

[0007] In this application, the final heating mode is determined based on the required heating amount, waste heat and the energy consumption of different heating modes. The energy consumption of different heating modes can be introduced for comparison, and the heating mode with the lowest energy consumption can be selected. Under the condition of the same heating amount, the heating mode with the lowest energy consumption can be selected among multiple heating schemes, ensuring that the entire vehicle operates in the lowest power consumption mode at any water temperature, reducing energy waste, improving thermal management efficiency, and for electric vehicles and hybrid vehicles, it can also increase the cruising range.

[0008] In some embodiments, the required heating amount is Q0 and the waste heat amount is Q1. Determining the final heating mode according to the required heating amount, the waste heat amount, and the energy consumption of different heating modes includes:

[0009] If Q0>Q1>0, the heating mode is determined according to the energy consumption in the heat pump heating mode, the waste heat heating PTC auxiliary heating mode, and the heat pump heating PTC auxiliary heating mode.

[0010] When the waste heat is not enough to provide the required heating capacity, three different heating modes can be selected according to different energy consumption.

[0011] In some embodiments, the energy consumption in the waste heat heating PTC auxiliary heating mode is W2, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, the maximum power consumption of the heat pump heating is W4, and the thermal efficiency of the PTC is η. If Q0>Q1>0, determining the heating mode according to the energy consumption in the heat pump heating mode, the waste heat heating PTC auxiliary heating mode, and the heat pump heating PTC auxiliary heating mode includes:

[0012] If Q0>Q1>0, and 0<Q3<Q0, select the heating mode with the smaller value between W3 and W2;

[0013] Among them, W3=W4+(Q0-Q3) / η, W2=(Q0-Q1) / η.

[0014] When waste heat is insufficient to provide the required heating capacity, and the energy provided by the heat pump operating at maximum power is also insufficient, PTC auxiliary heating is required to supplement the remaining heat. However, waste heat and heat pump energy cannot be used simultaneously. Therefore, the energy consumption (W3) of the heat pump PTC auxiliary heating mode is compared with the energy consumption (W2) of the waste heat PTC auxiliary heating mode, and the lower energy consumption mode is selected for heating. The energy consumption (W3) of the heat pump PTC auxiliary heating mode consists of two parts: the maximum power consumption (W4) of the heat pump and the power consumption of the PTC. The power consumption of the PTC in this mode is related to the PTC's heating capacity and its thermal conversion efficiency. The PTC's heating capacity is the difference between the required heating capacity and the maximum heating capacity of the heat pump. Therefore, the PTC's power consumption is (Q0 - Q3) / η. The energy consumption (W3) of the heat pump PTC auxiliary heating mode = W4 + (Q0 - Q3) / η. Energy consumption W2 in waste heat PTC auxiliary heating mode is primarily the PTC's power consumption. This power consumption is related to the PTC's heating capacity and its thermal conversion efficiency. The PTC's heating capacity is the difference between the required heating capacity and the waste heat. Therefore, the PTC's power consumption is (Q0 - Q1) / η. In practical applications, W4, Q3, and η are all vehicle-specific calibration values. Q1 and Q0 are temperature-dependent values ​​and can be calibrated through bench testing.

[0015] Q0=K1*(Tset–22)+K2*(Tset–Tin)-K3+K4+OFFSET;

[0016] Tset: set temperature;

[0017] Tin: indoor temperature;

[0018] K1: Set the temperature deviation gain, taking 22°C as the benchmark, to control the level of heating and cooling;

[0019] K2: Indoor temperature deviation gain, controls the temperature rise and fall to the set temperature level;

[0020] K3: External temperature compensation offset, different external temperature compensation is performed at different external temperatures;

[0021] OFFSET: A fixed constant. The smaller the value, the stronger the cooling performance; the larger the value, the stronger the heating capacity.

[0022] K4: Sunlight compensation offset, different sunlight compensation for different lighting conditions.

[0023] Q1=c1ρ1q1(t1-t2), where c1 is the coolant specific heat KJ / (kg*K), ρ is the coolant density in kgL, q is the coolant flow rate in L / s, t1 is the coolant inlet temperature in °C, and t2 is the coolant outlet temperature in °C.

[0024] In some embodiments, the energy consumption in the heat pump heating mode is W1, the energy consumption in the waste heat heating PTC auxiliary heating mode is W2, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, and the thermal efficiency of the PTC is η. If Q0>Q1>0, determining the heating mode according to the energy consumption in the heat pump heating mode, the waste heat heating PTC auxiliary heating mode, and the heat pump heating PTC auxiliary heating mode includes:

[0025] If Q0>Q1>0, and Q0≤Q3, select the heating mode with the smaller value between W1 and W2;

[0026] Wherein, W1 is the heat pump power consumption when the heating capacity is Q0, and W2 = (Q0-Q1) / η.

[0027] When waste heat is insufficient to provide the required heating capacity, and the energy provided by the heat pump operating at maximum power can provide the required heating capacity, you can choose the heat pump heating mode to supply all the heat, or you can choose the waste heat heating PTC auxiliary heating mode to supply the heat. Compare the energy consumption of the heat pump heating mode with the energy consumption of the waste heat heating PTC auxiliary heating mode, and choose the heating mode with lower energy consumption. In the heat pump heating mode, its power consumption is W1, which can be determined based on the calibration value. In the waste heat heating PTC auxiliary heating mode, energy consumption is generated by PTC auxiliary heating, and the heat of PTC auxiliary heating is the difference between the required heat and the waste heat. Therefore, the power consumption in this mode is W2 = (Q0-Q1) / η. Just compare W2 and W1.

[0028] Calculation method of W1:

[0029] Calculation of heating capacity in heat pump mode: Q3 = c3ρ3q3(t4-t5);

[0030] Where: c3 coolant specific heat unit KJ / (kg*K);

[0031] ρ3 coolant density in kg / L;

[0032] q3 coolant flow rate, unit L / s;

[0033] t4: Inlet water temperature °C, obtained through test calibration;

[0034] t5: outlet water temperature °C, obtained through test calibration;

[0035] Heat pump mode bench calibration: Input different motor battery waste water temperatures, run at different compressor speeds, obtain t4 and t5 temperatures, and simultaneously test the electric compressor power consumption at different compressor speeds:

[0036] As an example, the W1 power consumption can be calibrated by checking the bench calibration test data. When the motor battery waste water temperature is 30°C, the Q0 heating demand = 4kw. At this time, the compressor speed n corresponding to Q3 is 2200, and the electric compressor power consumption W1 at this speed is 0.6KW.

[0037] In some embodiments, if Q0 > Q1 = 0, the heating mode is determined based on the energy consumption of the heat pump heating mode, the PTC heating mode, and the heat pump heating with PTC auxiliary heating mode. If the waste heat is equal to 0, waste heat cannot be used for heating, and energy can only come from the heat pump and PTC. The heating mode with lower energy consumption is selected based on the energy consumption of the heat pump heating mode, the PTC heating mode, and the heat pump heating with PTC auxiliary heating mode.

[0038] In some embodiments, the energy consumption in the heat pump heating mode is W1, the energy consumption in the PTC heating mode is W5, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, the maximum power consumption of the heat pump heating is W4, and the thermal efficiency of the PTC is η. If Q0>Q1=0, determining the heating mode according to the energy consumption in the heat pump heating mode, the PTC heating mode, and the heat pump heating PTC auxiliary heating mode includes:

[0039] If Q0>Q1=0, and 0<Q3<Q0, select the heating mode with the smaller value between W3 and W5;

[0040] Among them, W3=W4+(Q0-Q3) / η, W5=Q0 / η.

[0041] When the waste heat reaches zero, if the heat provided by the heat pump at maximum power still falls short of the required heat, PTC heating or full PTC heating is required. By comparing the energy consumption (W3) of the heat pump heating mode with the energy consumption (W5) of the PTC heating mode, the lower-energy heating mode can be selected. In the PTC heating mode, energy consumption is generated partly by the heat pump and partly by the PTC. The heat pump's energy consumption is its maximum power consumption (W4). The PTC's power consumption is related to the difference (Q0 - Q3) between the required heat and the heat pump's heating energy, and the PTC's thermal efficiency (η). PTC power consumption = (Q0 - Q3) / η, so W3 = W4 + (Q0 - Q3) / η. In the full PTC heating mode, PTC power consumption is related to the required heat and the PTC's thermal efficiency (η), W5 = Q0 / η. Comparing W3 and W5 allows the selection of the lower-energy heating mode.

[0042] In some embodiments, the energy consumption in the heat pump heating mode is W1, the energy consumption in the PTC heating mode is W5, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, the maximum power consumption of the heat pump heating is W4, and the thermal efficiency of the PTC is η. If Q0>Q1=0, determining the heating mode according to the energy consumption in the heat pump heating mode, the PTC heating mode, and the heat pump heating PTC auxiliary heating mode includes:

[0043] If Q0>Q1=0, and Q0≤Q3, select the heating mode with the smaller value between W1 and W5;

[0044] Wherein, W1 is the heat pump power consumption when the heating capacity is Q0, and W5=Q0 / η.

[0045] When the waste heat is 0, if the heat provided by the heat pump operating at maximum power can meet the required heat, you can choose heat pump heating or PTC heating. By comparing the energy consumption of the heat pump heating mode and the PTC heating mode, you can choose the heating mode with lower energy consumption. In the heat pump heating mode, its energy consumption is the energy consumption W1 corresponding to the heating amount Q0. This can be obtained by calibrating the heat pump energy consumption values ​​for different heating requirements through bench testing. In the PTC heating mode, its energy consumption is the ratio of the required heating amount to the PTC thermal efficiency, W5 = Q0 / η. Compare the sizes of W1 and W5 and choose the heating mode with lower energy consumption.

[0046] In some embodiments, the required heating amount is Q0 and the waste heat amount is Q1. Determining the final heating mode according to the required heating amount, the waste heat amount, and the energy consumption of different heating modes includes:

[0047] If Q0≤Q1, then the waste heat heating mode is selected. When there is sufficient waste heat, waste heat heating is preferred because waste heat heating basically does not consume any energy.

[0048] In some embodiments, when Q0>Q1, determining the final heating mode based on the required heating amount, the waste heat amount, and the energy consumption of different heating modes includes:

[0049] If Q1=0, the heating capacity of the heat pump is 0, and the PTC heating mode is selected; when the residual heat is 0 and the heat pump cannot start heating, the PTC heating mode is directly selected.

[0050] If Q1>0, the heat pump's heating capacity is 0, and the residual heat heating PTC auxiliary heating mode is selected. When the residual heat is greater than 0 and the heat pump cannot start heating, the residual heat heating PTC auxiliary heating mode is directly selected.

[0051] In a second aspect, the present application provides a vehicle air conditioning thermal management device, comprising:

[0052] An acquisition unit, configured to acquire a required heating amount; and

[0053] The control unit is used to determine the final heating mode based on the required heating amount, waste heat and energy consumption of different heating modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0055] Figure 1 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0056] Figure 2 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0057] Figure 3 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0058] Figure 4 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0059] Figure 5 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0060] Figure 6 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0061] Figure 7 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0062] Figure 8 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0063] Figure 9 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

[0064] Figure 10 Schematic diagram of a vehicle air conditioning thermal management device according to an embodiment of the present application. DETAILED DESCRIPTION

[0065] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this application without making any creative efforts shall fall within the scope of protection of this application.

[0066] Cabin heating typically utilizes waste heat from the motor and battery, offering three methods: waste heat heating, heat pump heating, and PTC heating. This is typically calculated by comparing the target temperature, T0, with the motor and battery water temperature, T. Different control modes are used for different water temperatures. For example, if T0 < T, waste heat from the motor and battery is used; if T0 > T and T > 60°C, waste heat heating plus PTC heating are used as auxiliary heating; and if T0 > T and -5°C < T < 60°C, a waste heat heat pump from the motor and battery is used with PTC heating as auxiliary heating. This crude control method easily wastes energy and is detrimental to energy conservation and consumption reduction. To meet cab heating requirements, the target water temperature is typically higher than the actual demand, resulting in excessively high inputs to fulfill the heating request, leading to energy waste.

[0067] In view of this, the present application provides a vehicle air conditioning thermal management method and device to solve the existing problem of energy waste and disadvantages in energy saving and consumption reduction.

[0068] First, as Figure 1 As shown, the present application provides a vehicle air conditioning thermal management method, comprising the following steps:

[0069] S100, obtaining required heating capacity;

[0070] S200: Determine a final heating mode based on the required heating amount, the waste heat amount, and the energy consumption of different heating modes.

[0071] In this application, the final heating mode is determined based on the required heating amount, waste heat and the energy consumption of different heating modes. The energy consumption of different heating modes can be introduced for comparison, and the heating mode with the lowest energy consumption can be selected. Under the condition of the same heating amount, the heating mode with the lowest energy consumption can be selected among multiple heating schemes, ensuring that the entire vehicle operates in the lowest power consumption mode at any water temperature, reducing energy waste, improving thermal management efficiency, and for electric vehicles and hybrid vehicles, it can also increase the cruising range.

[0072] In combination with the first aspect, in some embodiments provided in this application, such as Figure 2 As shown, the required heating amount is Q0 and the waste heat amount is Q1. The final heating mode is determined based on the required heating amount, waste heat amount and energy consumption of different heating modes.

[0073] S201 , if Q0>Q1>0, determine the heating mode according to the energy consumption in the heat pump heating mode, the waste heat heating PTC auxiliary heating mode, and the heat pump heating PTC auxiliary heating mode.

[0074] When the waste heat is not enough to provide the required heating capacity, three different heating modes can be selected according to different energy consumption.

[0075] In combination with the first aspect, in some embodiments provided in this application, such as Figure 3 As shown, the energy consumption in the waste heat heating PTC auxiliary heating mode is W2, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, the maximum power consumption of the heat pump heating is W4, and the thermal efficiency of the PTC is η. If Q0>Q1>0, the heating mode is determined according to the energy consumption in the heat pump heating mode, the waste heat heating PTC auxiliary heating mode, and the heat pump heating PTC auxiliary heating mode, including:

[0076] S2011. If Q0>Q1>0, and 0<Q3<Q0, select the heating mode with the smaller value between W3 and W2;

[0077] Among them, W3=W4+(Q0-Q3) / η, W2=(Q0-Q1) / η.

[0078] When waste heat is insufficient to provide the required heating capacity, and the energy provided by the heat pump operating at maximum power is also insufficient, PTC auxiliary heating is required to supplement the remaining heat. However, waste heat and heat pump energy cannot be used simultaneously. Therefore, the energy consumption (W3) of the heat pump PTC auxiliary heating mode is compared with the energy consumption (W2) of the waste heat PTC auxiliary heating mode, and the lower energy consumption mode is selected for heating. The energy consumption (W3) of the heat pump PTC auxiliary heating mode consists of two parts: the maximum power consumption (W4) of the heat pump and the power consumption of the PTC. The power consumption of the PTC in this mode is related to the PTC's heating capacity and its thermal conversion efficiency. The PTC's heating capacity is the difference between the required heating capacity and the maximum heating capacity of the heat pump. Therefore, the PTC's power consumption is (Q0 - Q3) / η. The energy consumption (W3) of the heat pump PTC auxiliary heating mode = W4 + (Q0 - Q3) / η. Energy consumption W2 in waste heat PTC auxiliary heating mode is primarily the PTC's power consumption. This power consumption is related to the PTC's heating capacity and its thermal conversion efficiency. The PTC's heating capacity is the difference between the required heating capacity and the waste heat. Therefore, the PTC's power consumption is (Q0 - Q1) / η. In practical applications, W4, Q3, and η are all vehicle-specific calibration values. Q1 and Q0 are temperature-dependent values ​​and can be calibrated through bench testing.

[0079] Q0=K1*(Tset–22)+K2*(Tset–Tin)-K3+K4+OFFSET

[0080] Tset: set temperature;

[0081] Tin: indoor temperature;

[0082] K1: Set the temperature deviation gain, taking 22°C as the benchmark, to control the level of heating and cooling;

[0083] K2: Indoor temperature deviation gain, controls the temperature rise and fall to the set temperature level;

[0084] K3: External temperature compensation offset, different external temperature compensation is performed at different external temperatures;

[0085] OFFSET: A fixed constant. The smaller the value, the stronger the cooling performance; the larger the value, the stronger the heating capacity.

[0086] K4: Sunlight compensation offset, different sunlight compensation for different lighting conditions.

[0087] Q1=c1ρ1q1(t1-t2), where c1 is the coolant specific heat KJ / (kg*K), ρ is the coolant density in kgL, q is the coolant flow rate in L / s, t1 is the coolant inlet temperature in °C, and t2 is the coolant outlet temperature in °C.

[0088] In combination with the first aspect, in some embodiments provided in this application, such as Figure 4 As shown, the energy consumption in the heat pump heating mode is W1, the energy consumption in the waste heat heating PTC auxiliary heating mode is W2, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, the thermal efficiency of the PTC is η, and if Q0>Q1>0, the heating mode is determined according to the energy consumption of the heat pump heating mode, the waste heat heating PTC auxiliary heating mode, and the heat pump heating PTC auxiliary heating mode, including:

[0089] S2012. If Q0>Q1>0, and Q0≤Q3, select the heating mode with the smaller value between W1 and W2;

[0090] Wherein, W1 is the heat pump power consumption when the heating capacity is Q0, and W2 = (Q0-Q1) / η.

[0091] When waste heat is insufficient to provide the required heating capacity, and the energy provided by the heat pump operating at maximum power can provide the required heating capacity, you can choose the heat pump heating mode to supply all the heat, or you can choose the waste heat heating PTC auxiliary heating mode to supply the heat. Compare the energy consumption of the heat pump heating mode with the energy consumption of the waste heat heating PTC auxiliary heating mode, and choose the heating mode with lower energy consumption. In the heat pump heating mode, its power consumption is W1, which can be determined based on the calibration value. In the waste heat heating PTC auxiliary heating mode, energy consumption is generated by PTC auxiliary heating, and the heat of PTC auxiliary heating is the difference between the required heat and the waste heat. Therefore, the power consumption in this mode is W2 = (Q0-Q1) / η. Just compare W2 and W1.

[0092] Calculation method of W1:

[0093] Calculation of heating capacity in heat pump mode: Q3 = c3ρ3q3(t4-t5);

[0094] Where: c3 coolant specific heat unit KJ / (kg*K);

[0095] ρ3 coolant density in kg / L;

[0096] q3 coolant flow rate, unit L / s;

[0097] t4: Inlet water temperature °C, obtained through test calibration;

[0098] t5: outlet water temperature °C, obtained through test calibration;

[0099] Heat pump mode bench calibration: Input different motor battery waste water temperatures, run at different compressor speeds, obtain t4 and t5 temperatures, and simultaneously test the electric compressor power consumption at different compressor speeds:

[0100] As an example, the W1 power consumption can be calibrated by checking the bench calibration test data. When the motor battery waste water temperature is 30°C, the Q0 heating demand = 4kw. At this time, the compressor speed n corresponding to Q3 is 2200, and the electric compressor power consumption W1 at this speed is 0.6KW.

[0101] In combination with the first aspect, in some embodiments provided in this application, such as Figure 5 As shown, the final heating mode is determined based on the required heating amount, waste heat and energy consumption of different heating modes, including:

[0102] S202: If Q0 > Q1 = 0, determine the heating mode based on the energy consumption in the heat pump heating mode, PTC heating mode, and heat pump heating with PTC auxiliary heating mode. If the waste heat is equal to 0, waste heat cannot be used for heating, and energy can only come from the heat pump and PTC. Based on the energy consumption in the heat pump heating mode, PTC heating mode, and heat pump heating with PTC auxiliary heating mode, select the heating mode with lower energy consumption.

[0103] In combination with the first aspect, in some embodiments provided in this application, such as Figure 6 As shown, the energy consumption in the heat pump heating mode is W1, the energy consumption in the PTC heating mode is W5, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, the maximum power consumption of the heat pump heating is W4, and the thermal efficiency of the PTC is η. If Q0>Q1=0, the heating mode is determined according to the energy consumption in the heat pump heating mode, the PTC heating mode, and the heat pump heating PTC auxiliary heating mode, including:

[0104] S2021. If Q0>Q1=0, and 0<Q3<Q0, select the heating mode with the smaller value between W3 and W5;

[0105] Among them, W3=W4+(Q0-Q3) / η, W5=Q0 / η.

[0106] When the waste heat reaches zero, if the heat provided by the heat pump at maximum power still falls short of the required heat, PTC heating or full PTC heating is required. By comparing the energy consumption (W3) of the heat pump heating mode with the energy consumption (W5) of the PTC heating mode, the lower-energy heating mode can be selected. In the PTC heating mode, energy consumption is generated partly by the heat pump and partly by the PTC. The heat pump's energy consumption is its maximum power consumption (W4). The PTC's power consumption is related to the difference (Q0 - Q3) between the required heat and the heat pump's heating energy, and the PTC's thermal efficiency (η). PTC power consumption = (Q0 - Q3) / η, so W3 = W4 + (Q0 - Q3) / η. In the full PTC heating mode, PTC power consumption is related to the required heat and the PTC's thermal efficiency (η), W5 = Q0 / η. Comparing W3 and W5 allows the selection of the lower-energy heating mode.

[0107] In combination with the first aspect, in some embodiments provided in this application, such as Figure 7 As shown, the energy consumption in the heat pump heating mode is W1, the energy consumption in the PTC heating mode is W5, the energy consumption in the heat pump heating PTC auxiliary heating mode is W3, the maximum heating capacity of the heat pump heating is Q3, the maximum power consumption of the heat pump heating is W4, and the thermal efficiency of the PTC is η. If Q0>Q1=0, the heating mode is determined according to the energy consumption in the heat pump heating mode, the PTC heating mode, and the heat pump heating PTC auxiliary heating mode, including:

[0108] S2022. If Q0>Q1=0, and Q0≤Q3, select the heating mode with the smaller value between W1 and W5;

[0109] Wherein, W1 is the heat pump power consumption when the heating capacity is Q0, and W5=Q0 / η.

[0110] When the waste heat is 0, if the heat provided by the heat pump operating at maximum power can meet the required heat, you can choose heat pump heating or PTC heating. By comparing the energy consumption of the heat pump heating mode and the PTC heating mode, you can choose the heating mode with lower energy consumption. In the heat pump heating mode, its energy consumption is the energy consumption W1 corresponding to the heating amount Q0. This can be obtained by calibrating the heat pump energy consumption values ​​for different heating requirements through bench testing. In the PTC heating mode, its energy consumption is the ratio of the required heating amount to the PTC thermal efficiency, W5 = Q0 / η. Compare the sizes of W1 and W5 and choose the heating mode with lower energy consumption.

[0111] In combination with the first aspect, in some embodiments provided in this application, such as Figure 8 As shown, the required heating amount is Q0 and the waste heat amount is Q1. The final heating mode is determined based on the required heating amount, waste heat amount and energy consumption of different heating modes.

[0112] S203: If Q0≤Q1, then select the waste heat heating mode. When there is sufficient waste heat, waste heat heating is preferred because waste heat heating generates almost no energy consumption.

[0113] In combination with the first aspect, in some embodiments provided in this application, such as Figure 9 As shown, when Q0>Q1, the final heating mode is determined based on the required heating amount, waste heat and energy consumption of different heating modes, including:

[0114] S204: If Q1=0, the heating capacity of the heat pump is 0, then the PTC heating mode is selected; when the residual heat is 0 and the heat pump cannot start heating, the PTC heating mode is directly selected.

[0115] If Q1>0, the heat pump's heating capacity is 0, and the residual heat heating PTC auxiliary heating mode is selected. When the residual heat is greater than 0 and the heat pump cannot start heating, the residual heat heating PTC auxiliary heating mode is directly selected.

[0116] Second, as Figure 10 As shown, the present application provides a vehicle air conditioning thermal management device, comprising:

[0117] An acquisition unit, configured to acquire a required heating amount; and

[0118] The control unit is used to determine the final heating mode based on the required heating amount, waste heat and energy consumption of different heating modes.

[0119] In summary, the final heating mode is determined based on the required heating amount, waste heat and the energy consumption of different heating modes. By introducing the energy consumption of different heating modes and comparing them, the heating mode with the lowest energy consumption can be selected. Under the condition of the same heating amount, the heating mode with the lowest energy consumption can be selected among multiple heating schemes. At any water temperature, the entire vehicle is guaranteed to operate in the lowest power consumption mode, reducing energy waste and improving thermal management efficiency. For electric vehicles and hybrid vehicles, the cruising range can also be increased.

[0120] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0121] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0122] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0123] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0124] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0125] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vehicle air conditioning thermal management method, characterized in that: The following steps are involved: Obtain the required heating capacity Q0, waste heat capacity Q1, energy consumption W2 in waste heat heating and PTC auxiliary heating mode, energy consumption W3 in heat pump heating and PTC auxiliary heating mode, maximum heating capacity Q3 of heat pump heating, maximum power consumption W4 of heat pump heating, and thermal efficiency η of PTC; If Q0>Q1>0, and 0<Q3<Q0, select the heating mode with the smaller value between W3 and W2; Among them, W3=W4+(Q0-Q3) / η, W2=(Q0-Q1) / η.

2. A vehicle air conditioning thermal management method, characterized in that: The following steps are involved: Obtain the required heating capacity Q0, waste heat capacity Q1, energy consumption W1 in heat pump heating mode, energy consumption W2 in waste heat heating PTC auxiliary heating mode, energy consumption W3 in heat pump heating PTC auxiliary heating mode, maximum heating capacity Q3 of heat pump heating, and thermal efficiency η of PTC; If Q0>Q1>0, and Q0≤Q3, select the heating mode with the smaller value between W1 and W2; Among them, W1 is the heat pump power consumption when the heating capacity is Q0, and W2=(Q0-Q1) / η.

3. A vehicle air conditioning thermal management device, characterized in that: include: An acquisition unit is used to obtain the required heating capacity Q0, the waste heat capacity Q1, the energy consumption W2 in the waste heat heating PTC auxiliary heating mode, the energy consumption W3 in the heat pump heating PTC auxiliary heating mode, the maximum heating capacity Q3 of the heat pump heating, the maximum power consumption W4 of the heat pump heating, and the thermal efficiency η of the PTC; as well as The control unit is used to select the heating mode with the smaller value between W3 and W2 if Q0>Q1>0 and 0<Q3<Q0; Among them, W3=W4+(Q0-Q3) / η, W2=(Q0-Q1) / η.

4. A vehicle air conditioning thermal management device, characterized in that: include: An acquisition unit is used to obtain the required heating capacity Q0, the waste heat capacity Q1, the energy consumption W1 in the heat pump heating mode, the energy consumption W2 in the waste heat heating PTC auxiliary heating mode, the energy consumption W3 in the heat pump heating PTC auxiliary heating mode, the maximum heating capacity Q3 of the heat pump heating, and the thermal efficiency η of the PTC; as well as The control unit is used to select the heating mode with the smaller value between W1 and W2 if Q0>Q1>0 and Q0≤Q3; Among them, W1 is the heat pump power consumption when the heating capacity is Q0, and W2=(Q0-Q1) / η.

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