Vehicle air conditioner heat management method and device

Abstract

The invention discloses a vehicle air conditioner heat management method and device, and relates to the technical field of heat management.The vehicle air conditioner heat management method comprises the following steps that the required heating capacity is obtained; and according to the required heating amount, the waste heat amount and the energy consumption of different heat supply modes, the final heat supply mode is determined. By introducing the energy consumption of different heat supply modes, comparing and selecting the heat supply mode with the minimum energy consumption, the heat supply mode with the minimum energy consumption can be selected in various heating schemes under the condition of the same heat supply amount, the whole vehicle can be ensured to run in the lowest power consumption mode at any water temperature, the energy waste is reduced, the heat management efficiency is improved, and the energy consumption of the whole vehicle is reduced. And for an electric vehicle and a hybrid electric vehicle, the endurance mileage can be increased.

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] Cab heating can generally utilize the residual heat of the motor battery, which can be achieved in three ways: residual heat heating, heat pump heating and PTC heating. Usually, the calculation is performed by comparing the target temperature T0 and the motor battery water temperature T. Different water temperatures are controlled by different control modes. For example, if T0<T, the residual heat of the motor battery is used; if T0>T, T>60℃, residual heat heating + PTC heating auxiliary heating; if T0>T, -5℃<T<60℃, the motor battery residual heat heat pump is used, and PTC heating auxiliary heating is used. This rough control method is prone to energy waste and is not conducive to energy saving 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 the present application, the final heating mode is determined according to 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, increasing 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, 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:

[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 the waste heat is not enough to provide the required heating capacity, and the energy provided by the heat pump running at maximum power is not enough to provide the required heating capacity, PTC auxiliary heating is needed to supplement the remaining heat, but the waste heat and the energy of the heat pump cannot be used at the same time. Therefore, the energy consumption W3 in the heat pump heating PTC auxiliary heating mode is compared with the energy consumption W2 in the waste heat heating PTC auxiliary heating mode, and the mode with low energy consumption is selected for heating. The energy consumption W3 in the heat pump heating PTC auxiliary heating mode consists of two parts, one part is the maximum power consumption W4 of the heat pump, and the other part is the power consumption of the PTC. The power consumption of the PTC in this mode is related to the heating capacity of the PTC and the thermal conversion efficiency of the PTC. The heating capacity of the PTC is the difference between the required heating capacity and the maximum heating capacity of the heat pump. Therefore, the power consumption of the PTC is (Q0-Q3) / η, and the energy consumption W3 in the heat pump heating PTC auxiliary heating mode is W4+(Q0-Q3) / η. The energy consumption W2 in the waste heat heating PTC auxiliary heating mode is mainly the power consumption of PTC. In this mode, the power consumption of PTC is related to the heat supply of PTC and the thermal conversion efficiency of PTC. The heat supply of PTC is the difference between the required heat supply and the waste heat. Therefore, the power consumption of PTC is (Q0-Q1) / η. In practical applications, W4, Q3 and η are all calibration values ​​related to the vehicle model. Q1 and Q0 are both temperature-related 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, and control the level of heating and cooling based on the setting of 22°C;

[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: fixed constant, the smaller it is, the stronger the cooling performance is; the larger it is, the stronger the heating capacity is;

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

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

[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, 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:

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

[0027] When the waste heat is not enough to provide the required heating capacity, and the energy provided by the heat pump running 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 heating. Compare the energy consumption of the heat pump heating mode and 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 known according to 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, so the power consumption in this mode is W2 = (Q0-Q1) / η. Just compare the size of 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] Bench calibration of heat pump mode: input different motor battery waste water temperatures, run at different compressor speeds, obtain t4 and t5 temperatures, and simultaneously test the power consumption of the electric compressor at different compressor speeds:

[0036] As an example, the W1 power consumption calibration can be done 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 is 0.6KW at this speed.

[0037] In some embodiments, 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. When 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 low energy consumption is selected according to the energy consumption in the heat pump heating mode, the PTC heating mode, and the heat pump heating 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, 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:

[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 is 0, if the heat provided by the heat pump at maximum power still cannot meet the required heat, PTC auxiliary heating is required, or PTC heating is used entirely. By comparing the energy consumption W3 in the heat pump heating PTC auxiliary heating mode with the energy consumption W5 in the PTC heating mode, the heating mode with low energy consumption is selected. In the heat pump heating PTC auxiliary heating mode, part of its energy consumption is generated by the heat pump and the other part is generated by PTC. The energy consumption of the heat pump is its maximum power consumption W4. The power consumption of PTC is related to the difference between the required heat and the heat pump heating energy Q0-Q3 and the PTC thermal efficiency η. The power consumption of PTC = (Q0-Q3) / η, so W3 = W4+(Q0-Q3) / η. In the PTC heating mode, the power consumption of PTC is related to the required heat and the PTC thermal efficiency η, W5 = Q0 / η. By comparing W3 and W5, you can select a heating mode with low energy consumption.

[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, 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:

[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 power consumption of the heat pump 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 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 low energy consumption. In the heat pump heating mode, its energy consumption is the energy consumption W1 corresponding to the heating amount Q0, which can be obtained by calibrating the energy consumption value of the heat pump with 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 size of W1 and W5, and choose the heating mode with low 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, 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 according to 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, 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.

[0050] If Q1>0, the heating capacity of the heat pump is 0, then 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, used for acquiring a required heating amount; and

[0053] The control unit is used to determine the final heating mode according to 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 drawings required for use in the description of the embodiments will be briefly introduced below. 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 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] Fig. 9 This is a flow chart of a vehicle air conditioning thermal management method according to an embodiment of the present application.

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

[0065] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0066] Cab heating can generally utilize the waste heat of the motor battery, which can be achieved in three ways: waste heat heating, heat pump heating and PTC heating. Usually, the calculation is performed by comparing the target temperature T0 and the motor battery water temperature T. Different water temperatures are controlled by different control modes. For example, T0<T, the motor battery waste heat is used; T0>T, T>60℃, waste heat heating + PTC heating auxiliary heating; T0>T, -5℃<T<60℃, the motor battery waste heat heat pump is used, and PTC heating auxiliary heating is used. This rough control method is prone to energy waste and is not conducive to energy saving and consumption reduction. Generally, in order to meet the heating requirements of the cab, the target water temperature will be higher than the actual demand, and the input is too high to complete the heating request, resulting in 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 according to required heating amount, waste heat amount and energy consumption of different heating modes.

[0071] In the present application, the final heating mode is determined according to 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, increasing the cruising range.

[0072] In combination with the first aspect, in some embodiments provided in the present 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 according to the required heating amount, the waste heat amount and the energy consumption of different heating modes, including:

[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 the present 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 the waste heat is not enough to provide the required heating capacity, and the energy provided by the heat pump running at maximum power is not enough to provide the required heating capacity, PTC auxiliary heating is needed to supplement the remaining heat, but the waste heat and the energy of the heat pump cannot be used at the same time. Therefore, the energy consumption W3 in the heat pump heating PTC auxiliary heating mode is compared with the energy consumption W2 in the waste heat heating PTC auxiliary heating mode, and the mode with low energy consumption is selected for heating. The energy consumption W3 in the heat pump heating PTC auxiliary heating mode consists of two parts, one part is the maximum power consumption W4 of the heat pump, and the other part is the power consumption of the PTC. The power consumption of the PTC in this mode is related to the heating capacity of the PTC and the thermal conversion efficiency of the PTC. The heating capacity of the PTC is the difference between the required heating capacity and the maximum heating capacity of the heat pump. Therefore, the power consumption of the PTC is (Q0-Q3) / η, and the energy consumption W3 in the heat pump heating PTC auxiliary heating mode is W4+(Q0-Q3) / η. The energy consumption W2 in the waste heat heating PTC auxiliary heating mode is mainly the power consumption of PTC. In this mode, the power consumption of PTC is related to the heat supply of PTC and the thermal conversion efficiency of PTC. The heat supply of PTC is the difference between the required heat supply and the waste heat. Therefore, the power consumption of PTC is (Q0-Q1) / η. In practical applications, W4, Q3 and η are all calibration values ​​related to the vehicle model. Q1 and Q0 are both temperature-related 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, and control the level of heating and cooling based on the setting of 22°C;

[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: fixed constant, the smaller it is, the stronger the cooling performance is; the larger it is, the stronger the heating capacity is;

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

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

[0088] In combination with the first aspect, in some embodiments provided in the present 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, and the thermal efficiency of 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:

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

[0091] When the waste heat is not enough to provide the required heating capacity, and the energy provided by the heat pump running 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 heating. Compare the energy consumption of the heat pump heating mode and 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 known according to 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, so the power consumption in this mode is W2 = (Q0-Q1) / η. Just compare the size of 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] Bench calibration of heat pump mode: input different motor battery waste water temperatures, run at different compressor speeds, obtain t4 and t5 temperatures, and simultaneously test the power consumption of the electric compressor at different compressor speeds:

[0100] As an example, the W1 power consumption calibration can be done 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 is 0.6KW at this speed.

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

[0102] S202, if Q0>Q1=0, determine the heating mode according to the energy consumption in the heat pump heating mode, PTC heating mode and heat pump heating PTC auxiliary heating mode. When 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. According to the energy consumption in the heat pump heating mode, PTC heating mode and heat pump heating PTC auxiliary heating mode, select the heating mode with low energy consumption.

[0103] In combination with the first aspect, in some embodiments provided in the present 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 is 0, if the heat provided by the heat pump at maximum power still cannot meet the required heat, PTC auxiliary heating is required, or PTC heating is used entirely. By comparing the energy consumption W3 in the heat pump heating PTC auxiliary heating mode with the energy consumption W5 in the PTC heating mode, the heating mode with low energy consumption is selected. In the heat pump heating PTC auxiliary heating mode, part of its energy consumption is generated by the heat pump and the other part is generated by PTC. The energy consumption of the heat pump is its maximum power consumption W4. The power consumption of PTC is related to the difference between the required heat and the heat pump heating energy Q0-Q3 and the PTC thermal efficiency η. The power consumption of PTC = (Q0-Q3) / η, so W3 = W4+(Q0-Q3) / η. In the PTC heating mode, the power consumption of PTC is related to the required heat and the PTC thermal efficiency η, W5 = Q0 / η. By comparing W3 and W5, you can select a heating mode with low energy consumption.

[0107] In combination with the first aspect, in some embodiments provided in the present 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 power consumption of the heat pump 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 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 low energy consumption. In the heat pump heating mode, its energy consumption is the energy consumption W1 corresponding to the heating amount Q0, which can be obtained by calibrating the energy consumption value of the heat pump with 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 size of W1 and W5, and choose the heating mode with low energy consumption.

[0111] In combination with the first aspect, in some embodiments provided in the present 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 according to the required heating amount, the waste heat amount and the energy consumption of different heating modes, including:

[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 basically does not consume any energy.

[0113] In combination with the first aspect, in some embodiments provided in the present application, such as Fig. 9 As shown, when Q0>Q1, the final heating mode is determined according to 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 heating capacity of the heat pump is 0, then 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 Fig.10 As shown, the present application provides a vehicle air conditioning thermal management device, comprising:

[0117] An acquisition unit, used for acquiring a required heating amount; and

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

[0119] In summary, the final heating mode is determined according to 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. The whole vehicle can be guaranteed to operate in the lowest power consumption mode at any water temperature, thus reducing energy waste, improving thermal management efficiency and, for electric vehicles and hybrid vehicles, increasing the cruising range.

[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 "first", "second" and "third" to different types.

[0121] In the description of the embodiments of the present application, "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 the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[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; the “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 that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed 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 a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially 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, disk, CD) as described above, and includes a number of instructions for 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 are not intended to 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: Get the required heating amount; The final heating mode is determined based on the required heating amount, waste heat and energy consumption of different heating modes.

2. The vehicle air conditioning thermal management method according to claim 1, characterized in that: The required heating amount is Q0, and the waste heat amount is Q1. The final heating mode is determined according to the required heating amount, the waste heat amount, and the energy consumption of different heating modes, including: 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.

3. The vehicle air conditioning thermal management method according to claim 2, characterized in that: 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: 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.

4. The vehicle air conditioning thermal management method according to claim 2, characterized in that: 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 PTC is η, and 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: If Q0>Q1>0, and Q0≤Q3, select the heating mode with the smaller value between W1 and W2; Wherein, W1 is the power consumption of the heat pump when the heating capacity is Q0, and W2 = (Q0-Q1) / η.

5. The vehicle air conditioning thermal management method according to claim 1, characterized in that: The required heating amount is Q0, and the waste heat amount is Q1. The final heating mode is determined according to the required heating amount, the waste heat amount, and the energy consumption of different heating modes, including: 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.

6. The vehicle air conditioning thermal management method according to claim 5, characterized in that: 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: If Q0>Q1=0, and 0<Q3<Q0, select the heating mode with the smaller value between W3 and W5; Among them, W3=W4+(Q0-Q3) / η, W5=Q0 / η.

7. The vehicle air conditioning thermal management method according to claim 5, characterized in that: 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: If Q0>Q1=0, and Q0≤Q3, select the heating mode with the smaller value between W1 and W5; Wherein, W1 is the power consumption of the heat pump when the heating capacity is Q0, and W5=Q0 / η.

8. The vehicle air conditioning thermal management method according to claim 1, characterized in that: The required heating amount is Q0, and the waste heat amount is Q1. The final heating mode is determined according to the required heating amount, the waste heat amount, and the energy consumption of different heating modes, including: If Q0≤Q1, the waste heat heating mode is selected.

9. The vehicle air conditioning thermal management method according to claim 1, characterized in that: When Q0>Q1, the final heating mode is determined according to the required heating amount, waste heat and energy consumption of different heating modes, including: If Q1=0, the heating capacity of the heat pump is 0, then the PTC heating mode is selected; If Q1>0, the heating capacity of the heat pump is 0, then the waste heat heating PTC auxiliary heating mode is selected.

10. A vehicle air conditioning thermal management device, characterized in that: include: An acquisition unit, used for acquiring required heating amount; as well as The control unit is used to determine the final heating mode according to the required heating amount, waste heat and energy consumption of different heating modes.

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