Electric vehicle waste heat recovery control method, electronic device, and storage medium

Abstract

The application discloses an electric vehicle waste heat recovery control method, an electronic device and a storage medium. The method comprises the following steps: acquiring vehicle navigation information; determining a waste heat recovery mode according to the vehicle navigation information; when the waste heat recovery mode is a waste heat recovery battery mode, recovering waste heat to a battery, or when the waste heat recovery mode is a waste heat recovery heat pump mode, recovering waste heat to a heat pump. According to the navigation information, the waste heat recovery mode is dynamically determined as the waste heat recovery battery mode or the waste heat recovery heat pump mode, so that the waste heat recovery effect is improved, the low-pressure working environment of the heat pump system is improved, and the icing probability is reduced.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a method for controlling waste heat recovery in electric vehicles, an electronic device, and a storage medium. Background Technology

[0002] Existing electric vehicles generally have a waste heat recovery function, which recovers and reuses the waste heat generated by the motor. The existing waste heat recovery function uses a thermal management system to connect the motor water temperature to the battery side through a four-way water valve for heat exchange, and the motor water pump and battery water pump operate at maximum capacity.

[0003] However, although the purpose of waste heat recovery is to utilize the heat from the motor as much as possible for the whole vehicle and reduce the energy consumption of the thermal management system, the existing waste heat recovery control schemes do not take into account the energy consumption of low-pressure accessories.

[0004] Meanwhile, existing waste heat recovery technologies do not take into account the battery's discharge capacity, resulting in poor waste heat recovery effects and sometimes even counterproductive effects. The energy consumption of low-voltage accessories is lower than the energy-saving effect of waste heat recovery, making it impossible to maximize the utilization of the vehicle's overall capacity under different environments. Summary of the Invention

[0005] Therefore, it is necessary to provide a waste heat recovery control method, electronic device and storage medium for electric vehicles to address the technical problem that existing technologies only use the waste heat of the motor for battery heating, which fails to maximize the utilization of the vehicle's overall capacity.

[0006] This invention provides a method for controlling waste heat recovery in electric vehicles, comprising:

[0007] Obtain vehicle navigation information;

[0008] Determine the waste heat recovery mode based on vehicle navigation information;

[0009] When the waste heat recovery mode is the waste heat recovery battery mode, the waste heat is recovered to the battery; or when the waste heat recovery mode is the waste heat recovery heat pump mode, the waste heat is recovered to the heat pump.

[0010] Furthermore, determining the waste heat recovery mode based on vehicle navigation information specifically includes:

[0011] Based on the vehicle navigation information, determine the estimated travel time to reach the destination;

[0012] Obtain the battery temperature rise rate in waste heat recovery battery mode;

[0013] Based on the battery heating rate, calculate the estimated time required for the battery temperature to reach the power capacity limit temperature threshold.

[0014] If the estimated driving time is less than or equal to the estimated heating time, the waste heat recovery mode is determined to be the waste heat recovery battery mode; otherwise, the waste heat recovery mode is determined to be the waste heat recovery heat pump mode.

[0015] Furthermore, obtaining the battery temperature rise rate in the waste heat recovery battery mode specifically includes:

[0016] Obtain the estimated average speed to reach the destination and the current ambient temperature;

[0017] The battery temperature rise rate in waste heat recovery battery mode is obtained when the current ambient temperature is acquired and the vehicle is running at the estimated average vehicle speed.

[0018] Furthermore, the step of calculating the estimated time required for the battery temperature to reach the capacity limit temperature threshold based on the battery heating rate specifically includes:

[0019] Get the current lowest battery temperature;

[0020] The estimated time for temperature rise is calculated as: (T2-T1) / X, where T2 is the power capacity limiting temperature threshold, T1 is the current lowest battery temperature, and X is the battery temperature rise rate.

[0021] Furthermore, when the waste heat recovery mode is the waste heat recovery battery mode, recovering waste heat to the battery specifically includes:

[0022] When the waste heat recovery mode is the waste heat recovery battery mode, the motor circuit and the battery circuit are connected.

[0023] The motor circuit water pump and / or the battery circuit water pump of the control motor circuit operate at the first speed;

[0024] Monitor the battery temperature. If the battery temperature is greater than the target battery temperature threshold, control the motor circuit water pump and / or the battery circuit water pump of the motor circuit to operate at a second speed, which is lower than the first speed.

[0025] Furthermore, when the waste heat recovery mode is a waste heat recovery heat pump mode, recovering waste heat to the heat pump specifically includes:

[0026] When the waste heat recovery mode is the waste heat recovery heat pump mode, the control motor circuit exchanges heat with the heat pump system;

[0027] The water pump in the motor circuit of the control motor circuit operates at the third speed;

[0028] Monitor the motor temperature. If the motor temperature is lower than the motor temperature threshold, control the motor circuit water pump in the motor circuit to operate at a fourth speed, which is lower than the third speed.

[0029] Furthermore, the acquisition of vehicle navigation information specifically includes:

[0030] Obtain the current lowest battery temperature. If the difference between the current lowest battery temperature and the power capacity limiting temperature threshold is less than or equal to the difference threshold, then obtain vehicle navigation information; otherwise, recover waste heat to the heat pump.

[0031] Furthermore, prior to acquiring vehicle navigation information, the method further includes:

[0032] Obtain the temperature threshold that limits the battery's charge capacity under current vehicle operating conditions.

[0033] This invention provides an electronic device, comprising:

[0034] At least one processor; and,

[0035] A memory communicatively connected to at least one of the processors; wherein,

[0036] The memory stores instructions that can be executed by at least one of the processors to enable at least one of the processors to perform the electric vehicle waste heat recovery control method as described above.

[0037] The present invention provides a storage medium that stores computer instructions, which, when executed by a computer, are used to perform all the steps of the electric vehicle waste heat recovery control method described above.

[0038] Based on navigation information, this invention dynamically determines the waste heat recovery mode as either waste heat recovery battery mode or waste heat recovery heat pump mode, thereby improving the waste heat recovery effect, improving the low-pressure working environment of the heat pump system, and reducing the probability of icing. Attached Figure Description

[0039] Figure 1 This is a flowchart illustrating the process of a waste heat recovery control method for electric vehicles according to an embodiment of the present invention.

[0040] Figure 2 This is a flowchart illustrating a waste heat recovery control method for electric vehicles according to another embodiment of the present invention.

[0041] Figure 3 A flowchart illustrating the workflow of a waste heat recovery control method for electric vehicles, representing the preferred embodiment of the present invention.

[0042] Figure 4 This is a flowchart illustrating the workflow of the waste heat recovery battery mode, which is the preferred embodiment of the present invention.

[0043] Figure 5A flowchart illustrating the workflow of the waste heat recovery heat pump mode, which is the preferred embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of a vehicle thermal management system according to an example of the present invention;

[0045] Figure 7 This is a schematic diagram of a vehicle thermal management system in waste heat recovery heat pump mode, as an example of the present invention.

[0046] Figure 8 This is a schematic diagram of a vehicle thermal management system in waste heat recovery battery mode, as an example of the present invention.

[0047] Figure 9 This is a schematic diagram of the hardware structure of an electronic device according to the present invention. Detailed Implementation

[0048] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0049] like Figure 1 The diagram shown is a flowchart of a waste heat recovery control method for electric vehicles according to an embodiment of the present invention, including:

[0050] Step S101: Obtain vehicle navigation information;

[0051] Step S102: Determine the waste heat recovery mode based on the vehicle navigation information;

[0052] Step S103: When the waste heat recovery mode is the waste heat recovery battery mode, the motor circuit is used to dissipate heat from the battery; or when the waste heat recovery mode is the waste heat recovery heat pump mode, the waste heat is recovered to the heat pump.

[0053] Specifically, the present invention can be applied to the electronic control unit (ECU) of a vehicle.

[0054] This embodiment dynamically selects the waste heat recovery mode based on the customer's navigation information.

[0055] First, step S101 is executed to obtain vehicle navigation information. Vehicle navigation information can be obtained from the vehicle's navigation module based on information about the vehicle's arrival at its destination.

[0056] In one embodiment, the vehicle navigation information includes the estimated average speed of the vehicle to reach its destination and the estimated travel time.

[0057] Then, step S102 is executed to determine the waste heat recovery mode based on the vehicle navigation information. The waste heat recovery modes include waste heat recovery battery mode and waste heat recovery heat pump mode. Then, step S103 is executed to apply the determined waste heat recovery mode.

[0058] In the waste heat recovery battery mode, the motor circuit and battery circuit are connected, thereby distributing the motor's waste heat to the battery for heating. In the waste heat recovery heat pump mode, the heat exchange between the motor circuit and the heat pump system is controlled. Specifically, the motor coolant circuit exchanges heat with the heat pump waste heat recovery heat exchanger, and the motor's waste heat is distributed to the heat pump system through heat exchange between the low-temperature refrigerant and the coolant.

[0059] Specifically, such as Figure 6 The diagram illustrates a vehicle thermal management system according to an example of the present invention. The vehicle thermal management system includes: a motor circuit 61 (identified by an orange line), a battery circuit 62 (identified by a green line), and a heat pump system. The motor circuit 61 exchanges heat with the heat pump system through a heat exchanger 65, and the battery circuit 62 exchanges heat with the heat pump system through a heat exchanger 65. The motor circuit 61 and the battery circuit 62 are connected by a four-way water valve 66, which controls whether the motor circuit 61 or the battery circuit 62 is connected to the heat exchanger 65. The motor circuit 61 includes at least a motor water pump 611 to control the flow rate of the motor circuit 61, and the battery circuit 62 includes at least a battery water pump 621 to control the flow rate of the battery circuit 62.

[0060] As an example, motor circuit 61 includes a motor water pump 611, a front motor electrical system module 612, a motor circuit three-way water valve 613, a low-temperature radiator 614, a motor main liquid channel 615, and an integrated auxiliary water tank 616. The motor water pump 611, the front motor electrical system module 612, the motor circuit three-way water valve 613, and the low-temperature radiator 614 are connected sequentially, and then connected to one end of the motor main liquid channel 615 via a four-way water valve 66. The other end of the motor main liquid channel 615 is connected to the motor water pump 611 via the integrated auxiliary water tank 616, forming a circuit. The motor main liquid channel 615 is connected to the motor (not shown in the figure). Preferably, motor circuit 61 is a cooling water circuit, using cooling water to cool the motor and extract waste heat from it.

[0061] The battery circuit 62 includes a battery water pump 621, a battery coolant cooler plate 622, and a battery circuit check valve 623. One end of the battery water pump 621 is connected to one end of the battery coolant cooler plate 622, and the other end of the battery coolant cooler plate 622 is connected to a four-way water valve 66. The other end of the battery water pump 621 is connected to the four-way water valve 66 after passing through a heat exchanger 65. The other end of the battery water pump 621 is also connected to the four-way water valve 66 through the battery circuit check valve 623.

[0062] The heat pump system includes: refrigerant circuit 63 (marked with a blue line) and heating circuit 64 (marked with a red line).

[0063] in:

[0064] The refrigerant circuit 63 includes a water-cooled condenser 6301, a heat pump dehumidification shut-off valve 6302, an external evaporator (Outdoor Air Heat Exchanger, OHX) 6303, a heat pump system check valve 6304, a heat pump heating shut-off valve 6305, an internal heat exchanger (Internal heat exchanger, IHX) 6306, a compressor 6307, a first electronic expansion valve 6308, a second electronic expansion valve 6309, a third electronic expansion valve 6310, a gas-liquid separator 6311, and an evaporator 6312.

[0065] The warm air circuit 64 includes a warm air water pump 641, a water heater (WPTC) 642, a heating element 643, and a warm air circuit three-way water valve 644.

[0066] In the refrigerant circuit 63, the water-cooled condenser 6301 is connected in sequence to the first electronic expansion valve 6308, the external evaporator 6303, the IHX 6306, the evaporator 6312, the gas-liquid separator 6311, and the compressor 6307 to form a circuit. At the same time, the water-cooled condenser 6301 is also connected in sequence to the heat pump dehumidification shut-off valve 6302 and the heat pump system check valve 6304. Meanwhile, the evaporator 6312 is also connected to the heat exchanger 65 through the third electronic expansion valve 6310.

[0067] In the warm air circuit 64, the warm air water pump 641 is connected in sequence to the water-cooled condenser 6301, the water heater 642, the heating core 643, and the warm air circuit three-way water valve 644 to form a circuit.

[0068] like Figure 7 As shown, the gray line segment indicates no flow. In the waste heat recovery heat pump mode, the third electronic expansion valve 6310 opens, connecting the heat pump system to the heat exchanger 65. The motor heat is diverted through the four-way water valve 66 and enters the heat exchanger 65 to exchange heat with the refrigerant. After absorbing the motor heat, the refrigerant is compressed by the compressor 6307, causing the exhaust temperature of the compressor 6307 to rise. The high-temperature refrigerant passes through the water-cooled condenser 6301, and the heating circuit 64 cools the high-temperature refrigerant through the water-cooled condenser 6301, carrying away the heat. The refrigerant then enters the passenger compartment from the heating core 643 via the heating circuit 64. On the other hand, the coolant in the motor circuit 61, after passing through the heat exchanger 65, returns to the motor main liquid channel 615 through the battery circuit check valve 623 and the four-way water valve 66. The coolant does not enter the battery water-cooling plate 622.

[0069] like Figure 8 As shown, the gray line segment indicates no flow. In the waste heat recovery battery mode, the third electronic expansion valve 6310 is closed, thus disconnecting the heat pump system from the heat exchanger 65. The motor heat is diverted through the four-way water valve 66 and enters the heat exchanger 65. Since the battery water pump 621 is turned on, the coolant enters the battery water cooling plate 622 under the water pump pressure. After flowing out of the battery water cooling plate 622, it returns to the motor main liquid channel 615 through the four-way water valve 66. Since the third electronic expansion valve 6310 is closed, the coolant does not exchange heat in the heat exchanger 65. Therefore, the heat enters the battery water cooling plate 622 and heats the battery.

[0070] Existing electric vehicles primarily utilize waste heat recovery from the motor, but the consumption of low-pressure components in this mode is often overlooked, resulting in limited effectiveness. This invention dynamically determines the waste heat recovery mode—either battery mode or heat pump mode—based on navigation information, thereby improving waste heat recovery efficiency, enhancing the low-pressure operating environment of the heat pump system, and reducing the probability of icing.

[0071] like Figure 2 The diagram shown is a flowchart of a waste heat recovery control method for electric vehicles according to another embodiment of the present invention, including:

[0072] Step S201: Obtain the current lowest battery temperature. If the difference between the current lowest battery temperature and the power capacity limiting temperature threshold is less than or equal to the difference threshold, obtain vehicle navigation information; otherwise, recover waste heat to the heat pump.

[0073] In one embodiment, prior to acquiring the vehicle navigation information, the method further includes:

[0074] Obtain the temperature threshold that limits the battery's charge capacity under current vehicle operating conditions.

[0075] Step S202: Determine the estimated travel time to reach the destination based on the vehicle navigation information.

[0076] Step S203: Obtain the battery temperature rise rate in the waste heat recovery battery mode.

[0077] In one embodiment, obtaining the battery temperature rise rate in the waste heat recovery battery mode specifically includes:

[0078] Obtain the estimated average speed to reach the destination and the current ambient temperature;

[0079] The battery temperature rise rate in waste heat recovery battery mode is obtained when the current ambient temperature is acquired and the vehicle is running at the estimated average vehicle speed.

[0080] Step S204: Calculate the estimated time required for the battery temperature to reach the power capacity limit temperature threshold based on the battery heating rate.

[0081] In one embodiment, calculating the estimated time required for the battery temperature to reach the capacity limit temperature threshold based on the battery heating rate specifically includes:

[0082] Get the current lowest battery temperature;

[0083] The estimated time for temperature rise is calculated as: (T2-T1) / X, where T2 is the power capacity limiting temperature threshold, T1 is the current lowest battery temperature, and X is the battery temperature rise rate.

[0084] Step S205: If the estimated driving time is less than or equal to the estimated heating time, then the waste heat recovery mode is determined to be the waste heat recovery battery mode; otherwise, the waste heat recovery mode is determined to be the waste heat recovery heat pump mode.

[0085] Step S206: When the waste heat recovery mode is the waste heat recovery battery mode, the motor circuit is used to dissipate heat from the battery; or when the waste heat recovery mode is the waste heat recovery heat pump mode, the waste heat is recovered to the heat pump.

[0086] In one embodiment, when the waste heat recovery mode is a waste heat recovery battery mode, recovering waste heat to the battery specifically includes:

[0087] When the waste heat recovery mode is the waste heat recovery battery mode, the motor circuit and the battery circuit are connected.

[0088] The motor circuit water pump and / or the battery circuit water pump of the control motor circuit operate at the first speed;

[0089] Monitor the battery temperature. If the battery temperature is greater than the target battery temperature threshold, control the motor circuit water pump and / or the battery circuit water pump of the motor circuit to operate at a second speed, which is lower than the first speed.

[0090] In one embodiment, when the waste heat recovery mode is a waste heat recovery heat pump mode, recovering waste heat to the heat pump specifically includes:

[0091] When the waste heat recovery mode is the waste heat recovery heat pump mode, the control motor circuit exchanges heat with the heat pump system;

[0092] The water pump in the motor circuit of the control motor circuit operates at the third speed;

[0093] Monitor the motor temperature. If the motor temperature is lower than the motor temperature threshold, control the motor circuit water pump in the motor circuit to operate at a fourth speed, which is lower than the third speed.

[0094] Specifically, this embodiment intelligently determines the optimal energy efficiency scheme for waste heat utilization. If the waste heat of the motor can be used to heat the battery and ensure that the battery can fully utilize its capacity, then the heat is recovered to the battery; otherwise, the heat is recovered to the heat pump system, resulting in higher energy-saving effects.

[0095] First, step S201 is executed, where the controller monitors and obtains the current minimum battery temperature. The capacity limit temperature threshold can be pre-calibrated. Below this threshold, the kinetic energy recovery and battery discharge of the electric vehicle are limited, preventing the battery from fully utilizing its capacity and resulting in significant range reduction in low temperatures. Therefore, if the difference between the current minimum battery temperature and the capacity limit temperature threshold is less than or equal to the threshold, indicating a low battery temperature, vehicle navigation information can be obtained, and step S202 is executed to acquire this information. Conversely, if the difference is greater than or equal to the threshold, the minimum battery temperature has exceeded the capacity limit temperature threshold, ensuring the battery can fully utilize its capacity. Therefore, waste heat can be recovered into the heat pump system, resulting in higher energy efficiency.

[0096] In some embodiments, the difference threshold is a positive number greater than 0. Preferably, the difference threshold is 2°C.

[0097] Among them, vehicle navigation information can be obtained from the vehicle's navigation module based on the information about the vehicle's arrival at its destination.

[0098] In one embodiment, prior to acquiring the vehicle navigation information, the method further includes:

[0099] Obtain the temperature threshold that limits the battery's charge capacity under current vehicle operating conditions.

[0100] Specifically, the capacity limiting temperature threshold can be the capacity limiting temperature threshold of this battery under the current vehicle operating conditions. That is, the capacity limiting temperature threshold corresponding to this battery is pre-calibrated according to different operating conditions.

[0101] Then, step S203 is executed to obtain the battery temperature rise rate in the waste heat recovery battery mode. The battery temperature rise rate can vary depending on different vehicle and environmental conditions. It can be determined in advance through experiments and by creating tables to identify the battery temperature rise rate under different vehicle and environmental conditions.

[0102] In one embodiment, obtaining the battery temperature rise rate in the waste heat recovery battery mode specifically includes:

[0103] Obtain the estimated average speed to reach the destination and the current ambient temperature;

[0104] The battery temperature rise rate in waste heat recovery battery mode is obtained when the current ambient temperature is acquired and the vehicle is running at the estimated average vehicle speed.

[0105] Specifically, battery heat generation is closely related to battery current; heat generation power = I 2 *R represents the battery discharge current during driving, which is related to the average vehicle speed. The higher the vehicle speed, the greater the battery discharge current and the greater the heat generation, directly affecting the heat dissipation effect. By using historical big data from the vehicle network, the battery temperature rise rate under different ambient temperatures and average vehicle speeds can be obtained, and then tabulated or fitted into a function. After obtaining the current ambient temperature and the estimated average vehicle speed, the corresponding battery temperature rise rate can be determined.

[0106] Then, step S204 is executed, calculating the estimated time required for the battery temperature to reach the capacity limit temperature threshold based on the battery heating rate. Once the battery heating rate is determined, the estimated time required for the battery temperature to reach the capacity limit temperature threshold can be calculated.

[0107] In one embodiment, calculating the estimated time required for the battery temperature to reach the capacity limit temperature threshold based on the battery heating rate specifically includes:

[0108] Get the current lowest battery temperature;

[0109] The estimated time for temperature rise is calculated as: (T2-T1) / X, where T2 is the power capacity limiting temperature threshold, T1 is the current lowest battery temperature, and X is the battery temperature rise rate.

[0110] Specifically, the capacity-limiting temperature threshold can be defined as the capacity-limiting temperature threshold for this battery under the current operating conditions. That is, the corresponding capacity-limiting temperature threshold is pre-calibrated for this battery based on different operating conditions. Therefore, when calculating the estimated temperature rise time, the corresponding capacity-limiting temperature threshold is first determined based on the current operating conditions, and then the estimated temperature rise time is calculated. The battery's minimum temperature is the lowest temperature of the battery cells. Since the battery is a component with uneven heat generation during driving, exhibiting maximum, average, and minimum temperatures, only when the battery's minimum temperature reaches the temperature threshold can it be proven that the battery's power performance is not affected.

[0111] This embodiment combines the battery's minimum temperature and the temperature threshold limiting its power capacity to calculate the estimated time required for temperature rise.

[0112] Then, step S205 is executed. Since the battery can basically reach a suitable operating temperature through self-heating over a long period of time, and residual heat is not needed for the time being, the estimated driving time is compared with the estimated heating time. If the estimated driving time is less than or equal to the estimated heating time, the battery temperature will not exceed the power capacity limit temperature threshold before the vehicle reaches its destination. Therefore, the residual heat recovery mode is determined to be the residual heat recovery battery mode. Otherwise, since the battery temperature may exceed the power capacity limit temperature threshold during vehicle operation, the residual heat recovery mode is determined to be the residual heat recovery heat pump mode.

[0113] This embodiment dynamically selects either a waste heat recovery heat pump mode or a low-temperature heat dissipation mode based on customer navigation information and historical big data. If the waste heat from the motor can be used to ensure the battery's full capacity is utilized, the heat is recovered to the battery; otherwise, the heat is recovered to the heat pump system, resulting in higher energy-saving effects.

[0114] Finally, in step S206, the determined waste heat recovery mode is adopted.

[0115] In one embodiment, when the waste heat recovery mode is a waste heat recovery battery mode, recovering waste heat to the battery specifically includes:

[0116] When the waste heat recovery mode is the waste heat recovery battery mode, the motor circuit and the battery circuit are connected.

[0117] The motor circuit water pump and / or the battery circuit water pump of the control motor circuit operate at the first speed;

[0118] Monitor the battery temperature. If the battery temperature is greater than the target battery temperature threshold, control the motor circuit water pump and / or the battery circuit water pump of the motor circuit to operate at a second speed, which is lower than the first speed.

[0119] The target battery temperature threshold is the temperature at which the battery can discharge efficiently. Since discharge efficiency and kinetic energy recovery are both part of electric vehicles, the target battery temperature threshold is also the optimal temperature for kinetic energy recovery. Meanwhile, during waste heat recovery, low-voltage accessories such as the motor circuit water pump and battery circuit water pump consume approximately 100W of energy, impacting the vehicle's low-temperature range by 1-2%. Therefore, when the battery temperature reaches the target battery temperature threshold, the speed of the motor circuit water pump and battery circuit water pump is reduced, thereby lowering their energy consumption.

[0120] like Figure 4 The diagram shown is a flowchart of the waste heat recovery battery mode of the preferred embodiment of the present invention, including:

[0121] In step S401, the battery-powered water pump and the motor-driven water pump operate at the first speed.

[0122] Step S402: Monitor battery temperature and battery discharge amount. If the battery temperature is greater than the target battery temperature threshold and the battery discharge amount is greater than the discharge amount threshold, then proceed to step S403; otherwise, continue to proceed to step S401.

[0123] Step S403: The battery-powered water pump and the motor-driven water pump operate at a second speed, which is less than the first speed, and the process ends.

[0124] Specifically, when entering the waste heat recovery battery mode, the motor circuit and the battery circuit are connected. Specifically, as follows: Figure 8 As shown, the coolant in the motor circuit 61 is diverted to the battery circuit 62 through the four-way water valve 66. At the same time, the three-way water valve 613 of the motor circuit closes the passage to the low-temperature radiator 614, ensuring that the residual heat of the motor does not pass through the front radiator, thereby ensuring that the heat is not lost by the air. This allows the coolant with a higher temperature in the motor circuit 61 to be introduced into the battery circuit 62 for heating.

[0125] Then, the motor-driven water pump and / or the battery-driven water pump initially operate at a higher speed to ensure the battery temperature rises quickly. Once the battery temperature reaches a certain level, the speed of the motor-driven water pump and / or the battery-driven water pump decreases to a lower speed. The second speed is lower than the first speed.

[0126] In some embodiments, when the battery temperature drops to the battery power-limiting temperature, the motor circuit water pump and the battery circuit water pump are stopped, and the heat exchange between the motor circuit and the heat pump system is controlled.

[0127] Specifically, such as Figure 7 As shown, when the battery temperature drops to the battery power-limiting temperature, the motor circuit water pump and the battery circuit water pump are stopped, and the third electronic expansion valve 6310 is opened, so that the motor circuit 61 exchanges heat with the heat pump system through the heat exchanger 65.

[0128] Preferably, the motor circuit water pump and the battery circuit water pump are low-pressure water pumps.

[0129] This embodiment can reduce the power consumption of the water pump while ensuring the battery temperature rise.

[0130] In one embodiment, when the waste heat recovery mode is a waste heat recovery heat pump mode, recovering waste heat to the heat pump specifically includes:

[0131] When the waste heat recovery mode is the waste heat recovery heat pump mode, the control motor circuit exchanges heat with the heat pump system;

[0132] The water pump in the motor circuit of the control motor circuit operates at the third speed;

[0133] Monitor the motor temperature. If the motor temperature is lower than the motor temperature threshold, control the motor circuit water pump in the motor circuit to operate at a fourth speed, which is lower than the third speed.

[0134] Specifically, the third speed can be equal to the first speed, and the fourth speed can be equal to the second speed.

[0135] When the motor temperature is below the motor temperature threshold, the motor has no heat dissipation requirement. Therefore, the electronic expansion valve used to control the heat exchange between the heat pump refrigerant and coolant in the heat pump system is opened, for example, by opening... Figure 6 The third electronic expansion valve 6310 in the system recovers waste heat from the motor as a second heat source, while the external evaporator 6303 is located outdoors and absorbs heat from the outside as the first heat source. This dual heat source scheme ensures that the system achieves a higher Coefficient of Performance (COP) at low temperatures. Simultaneously, in waste heat recovery heat pump mode, the motor loop pump operates at a third speed, and when the motor temperature is below the motor temperature threshold, the motor system has no cooling requirement, allowing the motor loop pump speed to be reduced.

[0136] This embodiment can reduce the power consumption of the water pump, enabling the water pump to achieve higher heat exchange efficiency at a lower speed.

[0137] like Figure 5 The diagram shown illustrates the workflow of the waste heat recovery heat pump mode in the preferred embodiment of the present invention, including:

[0138] In step S501, the motor-driven water pump operates at the third speed.

[0139] Preferably, the third rotational speed is the same as the first rotational speed.

[0140] Step S502: Monitor the motor temperature. If the motor temperature is less than the motor temperature threshold, proceed to step S503; otherwise, continue to step S501.

[0141] Step S503: The motor pump runs at the fourth speed, which is less than the third speed, and then the process ends.

[0142] Preferably, the fourth rotational speed is the same as the second rotational speed.

[0143] This embodiment can ensure that the system achieves a higher energy efficiency ratio at low temperatures, and the energy efficiency of the recovered heat pump is expected to increase by 5%.

[0144] like Figure 3 The diagram shown is a flowchart of a waste heat recovery control method for electric vehicles according to a preferred embodiment of the present invention, comprising:

[0145] Step S301: Determine whether the difference between the current lowest battery temperature and the battery's current capacity limit temperature threshold under the current operating conditions is less than or equal to the difference threshold. If yes, proceed to step S302; otherwise, recover the waste heat to the heat pump. The difference threshold is preferably 2°C.

[0146] Step S302: Confirm the estimated average vehicle speed V (km / h) and estimated travel time t (min) to reach the destination through navigation;

[0147] Step S303: Confirm the battery heating rate X (°C / min) in the battery mode using waste heat recovery under f (average vehicle speed V, current ambient temperature T) through vehicle big data;

[0148] Step S304: Calculate the estimated time for temperature rise;

[0149] Step S305: If the estimated driving time is less than or equal to the estimated heating time, the waste heat recovery to battery mode is used; otherwise, the waste heat recovery to heat pump mode is used.

[0150] Specifically, this embodiment dynamically selects either waste heat recovery battery mode or waste heat recovery heat pump mode based on customer navigation information and historical big data. The power of the low-voltage accessory is adjusted by monitoring the battery temperature and comparing it with different thresholds. After the motor waste heat recovery is completed, the motor heat is distributed to the heat pump system for further waste heat recovery.

[0151] In step S301, the controller monitors the current minimum battery temperature and confirms the capacity limit temperature threshold (typically 5-10℃ for most models). Below this threshold, energy recovery and battery discharge are limited, preventing the battery from fully utilizing its capacity and resulting in significant range reduction in low temperatures. If the difference between the current minimum battery temperature and the capacity limit temperature threshold for this battery under current conditions is less than or equal to the difference threshold, step S302 is executed; otherwise, waste heat is recovered to the heat pump.

[0152] In step S302, the estimated average vehicle speed and estimated travel time to the destination are obtained based on the navigation, thus obtaining customer usage information.

[0153] In step S303, the estimated average vehicle speed and current ambient temperature are input into the battery temperature rise rate versus vehicle speed and ambient temperature relationship function f, and big data analysis is performed to obtain the temperature rise rate of the waste heat recovery to battery mode.

[0154] Step S304: Calculate the estimated heating time. It is known that the battery's capacity limit temperature threshold under the current operating conditions is T2, and the current lowest battery temperature under the current operating conditions is T1. Therefore, the estimated heating time is (T2-T1) / X. During the estimated heating time, waste heat is recovered to the battery mode, and then waste heat is recovered to the heat pump mode.

[0155] Finally, step S305 is executed. If the estimated driving time determined by the navigation information at this time is ≤ (power capacity limit temperature threshold - current battery minimum temperature) / large data battery temperature rise rate, then the waste heat recovery battery mode is adopted; otherwise, the waste heat recovery heat pump mode is adopted.

[0156] This embodiment dynamically selects either a waste heat recovery heat pump mode or a waste heat recovery battery mode based on customer navigation information and historical big data. By introducing waste heat from the motor, the battery can be maintained at a more comfortable temperature, increasing battery discharge and improving range. The waste heat recovery effect is ≥2%, and the range is improved by 10km in low temperatures. Furthermore, switching to heat pump mode improves the energy consumption of the heat pump system compressor, reducing power consumption. Simultaneously, it improves the low-pressure operating environment of the heat pump system, reducing the probability of icing.

[0157] like Figure 9 The diagram shown is a hardware structure schematic of an electronic device according to the present invention, comprising:

[0158] At least one processor 901; and,

[0159] A memory 902 is communicatively connected to at least one of the processors 901; wherein,

[0160] The memory 902 stores instructions that can be executed by at least one of the processors to enable at least one of the processors to perform the electric vehicle waste heat recovery control method as described above.

[0161] Figure 9 Take the 901 processor as an example.

[0162] The electronic device is preferably an Electronic Control Unit (ECU) of the vehicle. The electronic device may also include an input device 903 and a display device 904.

[0163] The processor 901, memory 902, input device 903 and display device 904 can be connected by a bus or other means. The figure shows an example of connection by bus.

[0164] The memory 902, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the electric vehicle waste heat recovery control method in the embodiments of this application, for example, Figure 1 , Figure 2 The method flow is shown. The processor 901 executes various functional applications and data processing by running non-volatile software programs, instructions, and modules stored in the memory 902, thereby realizing the electric vehicle waste heat recovery control method in the above embodiments.

[0165] The memory 902 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the electric vehicle waste heat recovery control method, etc. Furthermore, the memory 902 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 902 may optionally include memory remotely located relative to the processor 901, and these remote memories can be connected via a network to the apparatus performing the electric vehicle waste heat recovery control method. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0166] The input device 903 can receive user clicks and generate signal inputs related to user settings and function control of the waste heat recovery control method for electric vehicles. The display device 904 may include a display screen or other display equipment.

[0167] The one or more modules are stored in the memory 902, and when run by the one or more processors 901, they execute the electric vehicle waste heat recovery control method in any of the above method embodiments.

[0168] Based on navigation information, this invention dynamically determines the waste heat recovery mode as either waste heat recovery battery mode or waste heat recovery heat pump mode, thereby improving the waste heat recovery effect, improving the low-pressure working environment of the heat pump system, and reducing the probability of icing.

[0169] One embodiment of the present invention provides a storage medium that stores computer instructions, which, when executed by a computer, are used to perform all the steps of the electric vehicle waste heat recovery control method described above.

[0170] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An electric vehicle waste heat recovery control method characterized by comprising: The method comprises the following steps: acquiring vehicle navigation information; determining a waste heat recovery mode according to the vehicle navigation information; recovering waste heat to a battery when the waste heat recovery mode is a waste heat recovery battery mode, or recovering waste heat to a heat pump when the waste heat recovery mode is a waste heat recovery heat pump mode; determining the waste heat recovery mode according to the vehicle navigation information specifically comprises: determining an estimated driving time to a destination according to the vehicle navigation information; acquiring a battery temperature rising rate in the waste heat recovery battery mode; calculating an estimated temperature rising time for a battery temperature to reach a temperature threshold of a power capacity limit according to the battery temperature rising rate; determining the waste heat recovery mode as the waste heat recovery battery mode if the estimated driving time is less than or equal to the estimated temperature rising time, otherwise determining the waste heat recovery mode as the waste heat recovery heat pump mode.

2. The control method of claim 1, wherein The step of acquiring the battery temperature rising rate in the waste heat recovery battery mode specifically comprises: acquiring an estimated average vehicle speed to the destination and acquiring a current ambient temperature; acquiring the battery temperature rising rate in the waste heat recovery battery mode when the current ambient temperature and the vehicle running at the estimated average vehicle speed are acquired.

3. The control method of claim 1, wherein The step of calculating the estimated temperature rising time for the battery temperature to reach the temperature threshold of the power capacity limit according to the battery temperature rising rate specifically comprises: acquiring a current minimum battery temperature; calculating the estimated temperature rising time as (T2-T1) / X, wherein T2 is the temperature threshold of the power capacity limit, T1 is the current minimum battery temperature, and X is the battery temperature rising rate.

4. The control method of claim 1, wherein The step of recovering waste heat to the battery when the waste heat recovery mode is the waste heat recovery battery mode specifically comprises: communicating a motor loop and a battery loop when the waste heat recovery mode is the waste heat recovery battery mode; controlling a motor loop water pump of the motor loop and / or a battery loop water pump of the battery loop to operate at a first rotating speed; monitoring a battery temperature, and if the battery temperature is greater than a battery target temperature threshold, controlling the motor loop water pump of the motor loop and / or the battery loop water pump of the battery loop to operate at a second rotating speed, the second rotating speed being lower than the first rotating speed.

5. The control method of claim 1, wherein The step of recovering waste heat to the heat pump when the waste heat recovery mode is the waste heat recovery heat pump mode specifically comprises: controlling the motor loop to exchange heat with a heat pump system when the waste heat recovery mode is the waste heat recovery heat pump mode; controlling a motor loop water pump of the motor loop to operate at a third rotating speed; monitoring a motor temperature, and if the motor temperature is less than a motor temperature threshold, controlling the motor loop water pump of the motor loop to operate at a fourth rotating speed, the fourth rotating speed being lower than the third rotating speed.

6. The control method of claim 1, wherein The step of acquiring the vehicle navigation information specifically comprises: acquiring the current minimum battery temperature, and if a difference between the current minimum battery temperature and the temperature threshold of the power capacity limit is less than or equal to a difference threshold, acquiring the vehicle navigation information, otherwise recovering waste heat to the heat pump.

7. The control method of claim 6, wherein Before the step of acquiring the vehicle navigation information, the method further comprises: acquiring the temperature threshold of the power capacity limit of the battery under a current vehicle working condition.

8. An electronic device, comprising: The system comprises: at least one processor; and a memory connected to the at least one processor in communication; wherein The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the electric vehicle waste heat recovery control method according to any one of claims 1 to 7.

9. A storage medium, characterized by The storage medium stores computer instructions, and when the computer executes the computer instructions, all steps of the electric vehicle waste heat recovery control method according to any one of claims 1 to 7 are performed.

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