Dual-motor active heating adaptive adjustment method, system and vehicle

Abstract

The embodiment of the application relates to the technical field of thermal management, and discloses a double-motor active heating adaptive adjustment method and system and a vehicle, which comprises the following steps: when it is detected that a vehicle is connected with a charging gun or the vehicle is in a cold start working condition; according to collected charging gun types, environmental parameters, battery state parameters and vehicle running state parameters, the heating participation states of front and rear motors are determined, corresponding motor heating modes are matched, and a heating action object is determined, the heating action object being at least one of a power battery and a vehicle passenger cabin; according to the matched heating mode and the determined heating action object, corresponding motors are controlled to run to perform corresponding heating work; the power battery temperature and the vehicle air conditioner working state are detected in real time, when the power battery temperature reaches a preset target temperature, the power battery heating work is stopped, and when it is detected that a user turns off the vehicle air conditioner, the passenger cabin heating work is stopped. The application solves the problem of poor adaptability.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, specifically to a dual-motor active heating adaptive adjustment method, system, and vehicle. Background Technology

[0002] When batteries in new energy vehicles operate in low-temperature environments, both their charging and discharging power and battery life experience significant degradation. Currently, the most widely used active heating methods for battery motors in the industry mainly include three types: pulse heating, stall heating, and degraded heating. Among them, pulse heating uses an inverter to generate a high-frequency pulse current across the battery terminals to achieve battery self-heating, offering the advantage of rapid temperature rise, but mainstream products can only be used when the vehicle is stationary; stall heating uses braking to lock the motor rotor, applying excitation current to generate iron and copper losses, and then heats the battery or passenger compartment through a circulating water channel; this heating method can only be carried out when the vehicle is not in driving mode; degraded heating actively reduces the motor's efficiency by controlling the motor to deviate from the optimal current control curve, converting some electrical energy into heat energy, and can be adapted to vehicle driving conditions for heating operations.

[0003] Existing battery heating solutions for dual-motor vehicles mostly use "heating power" as the sole allocation indicator, and the two motors basically use the same heating method. They do not take into account the thermal demand characteristics of different heating objects to carry out differentiated heating control, and also fail to make full use of the redundant working capacity of the dual motors. The overall heating control solution has poor adaptability and resource utilization. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a dual-motor active heating adaptive adjustment method, system and vehicle to solve the problems of single heating mode selection dimension, low heating efficiency, poor adaptive capability and failure to consider the heating needs of the passenger compartment.

[0005] In a first aspect, the present application provides a dual-motor active heating adaptive adjustment method, which includes the following steps:

[0006] Real-time detection of the vehicle's charging gun connection status and identification of the charging gun type. When the vehicle is detected to be connected to a charging gun or when the vehicle is in a cold start condition, the current environmental parameters, battery status parameters and vehicle operating status parameters of the vehicle are collected.

[0007] Based on the collected charging gun type, environmental parameters, battery status parameters, and vehicle operating status parameters, the heating participation status of the front and rear motors is determined, the corresponding motor heating method is matched, and the heating target is determined. The heating target is at least one of the power battery and the vehicle passenger compartment.

[0008] Based on the matching heating method and the determined object to be heated, the corresponding motor is controlled to operate in order to perform the corresponding heating operation;

[0009] The system monitors the power battery temperature and the vehicle's air conditioning status in real time. When the power battery temperature reaches the preset target temperature, the power battery heating operation is stopped. When the system detects that the user has turned off the vehicle's air conditioning, the passenger compartment heating operation is stopped.

[0010] In the above technical solution, this invention overcomes the limitations of existing technologies that rely solely on a single heating power dimension for heating decisions and only refine and optimize a single heating method. By collecting multi-dimensional information such as vehicle charging gun type, environmental parameters, battery status parameters, and overall vehicle operating status parameters, it constructs a heating decision logic, solving the technical problems of existing dual-motor vehicle models having a single heating decision dimension, fixed control methods, and poor adaptability to operating conditions. Based on the collected multi-dimensional parameters, this invention can determine the heating participation status of the front and rear motors, match the appropriate motor heating method, and accurately identify at least one of the power battery and the vehicle passenger compartment as the heating target. It can differentiate heating strategies according to actual operating conditions, avoiding the limitations of traditional single heating control modes. Simultaneously, this invention sets up heating operation execution and operating condition linkage start-stop logic, which can carry out battery and / or passenger compartment heating operations as needed and accurately start and stop them, effectively activating the redundant working capacity of dual motors, compensating for the shortcomings of traditional solutions that cannot simultaneously address the thermal needs of two heating targets, improving the resource utilization rate and operating condition adaptability of the vehicle's low-temperature thermal management, and effectively improving the battery's low-temperature charging and discharging degradation problem.

[0011] One possible implementation includes heating methods such as plug-in pulse heating, pulse heating, stall heating, degraded heating, positive temperature coefficient heating film heating, and coupled heating of various heating methods. Among them, the heating methods for the crew cabin include motor stall heating and thermal management water pump heating.

[0012] In the above technical solution, this invention explicitly defines the battery heating methods as including plug-in pulse heating, pulse heating, stall heating, degraded heating, positive temperature coefficient heating film heating, and combined heating of multiple heating methods. It also defines a specific heating type suitable for passenger compartment heating, accurately distinguishing the differentiated technical means of battery heating and passenger compartment heating. Compared to the single, fixed heating forms of existing technologies, this invention enriches the optional methods for low-temperature heating in dual-motor vehicles. It can match suitable single heating methods or combined heating methods according to the needs of different operating conditions and different heating objects, effectively avoiding the problems of poor adaptability and strong limitations of single heating methods.

[0013] In one possible implementation, when the vehicle is connected to a DC charging gun and the vehicle power supply is in the OFF position, if the power battery temperature is lower than a first preset temperature threshold, the dual motors are controlled to perform plug-in pulse heating until the power battery temperature reaches the first preset temperature threshold, then the plug-in pulse heating is stopped and the power battery enters normal charging state.

[0014] In the above technical solution, this invention, specifically for the static charging condition with DC charging guns and the vehicle in the OFF position, defines a unique heating strategy that uses dual motors simultaneously to synchronously preheat the power battery using pulse heating from the charging guns. This technical feature is adapted to the characteristics of vehicle static charging and external DC power supply conditions, relying on the power at the charging station to complete battery heating without consuming the battery's own power, thus effectively reducing battery energy loss.

[0015] In one possible implementation, when the vehicle is connected to a DC charging gun, the vehicle power supply is in the ON position, the ambient temperature is lower than a preset low temperature threshold, and the user turns on the vehicle's air conditioning, if the power battery temperature is lower than a second preset temperature threshold, the dual motors are controlled to perform plug-in pulse heating; if the power battery temperature is greater than or equal to the second preset temperature threshold and less than or equal to the first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating to heat the power battery, and the front motor is controlled to perform stall heating to heat the passenger compartment; if the power battery temperature is greater than the first preset temperature threshold, the power battery is charged normally, and the current battery state of charge is obtained; if the battery state of charge is less than a preset state of charge threshold, the dual motors are controlled to perform stall heating to heat the passenger compartment; if the battery state of charge is greater than or equal to the preset state of charge threshold, active heating is discontinued, and the residual heat of the motors combined with the water pump is used to heat the passenger compartment.

[0016] In the aforementioned technical solution, this invention, targeting DC charging and the vehicle's ON position, differentiates the dual-motor heating operating mode and heating target based on different temperature ranges of the power battery and its state of charge. Through a tiered control method—simultaneous dual-motor battery heating in the low-temperature range, dual-motor targeted heating in the medium-temperature range, and adaptive switching of the passenger compartment heating mode in the high-temperature range—precise allocation of heating resources is achieved. This specifically addresses the problems of uniform and undifferentiated control modes and low utilization of redundant motor resources in existing dual-motor heating solutions. While accurately ensuring the temperature control precision of the power battery, it adapts to different thermal demand scenarios, balancing battery heating effect with passenger compartment heating needs, thus achieving a balance between heating efficiency and overall vehicle energy economy.

[0017] In one possible implementation, when the vehicle is connected to an AC charging gun and the vehicle power supply is in the OFF position, if the power battery temperature is lower than a first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating alone until the power battery temperature is greater than or equal to the first preset temperature threshold, then the plug-in pulse heating is stopped and the power battery enters normal charging state.

[0018] In the above technical solution, this invention addresses the static charging condition with AC charging guns and the vehicle in the OFF position, limiting the preheating of the power battery to a single pulse heating method using the rear motor's individual charging gun. This technical solution is suitable for the low output power characteristics of AC charging piles. Compared to dual-motor synchronous heating, single-motor independent heating can effectively reduce the equipment load and overall energy consumption during the charging heating process while meeting the low-temperature preheating requirements of the power battery.

[0019] In one possible implementation, when the vehicle is connected to an AC charging gun, the vehicle power supply is in the ON position, the ambient temperature is lower than a preset low temperature threshold, and the user turns on the vehicle's air conditioning, if the power battery temperature is lower than a first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating to heat the power battery, and the front motor performs stall heating to heat the passenger compartment; if the power battery temperature is greater than or equal to the first preset temperature threshold, the power battery is charged normally, and the current battery state of charge is obtained; if the battery state of charge is lower than a preset state of charge threshold, the dual motors are controlled to stall heating to heat the passenger compartment; if the battery state of charge is greater than or equal to the preset state of charge threshold, active heating is stopped, and the residual heat of the motors combined with the water pump is used to heat the passenger compartment.

[0020] In the above technical solution, this invention, targeting the AC charging port and the vehicle in the ON position, sets a graded heating strategy based on the power battery temperature and SOC status. It limits the division of labor between the front and rear motors to achieve simultaneous heating of the battery and passenger compartment, and adaptively switches between residual heat heating and PTC auxiliary heating modes under high-temperature normal conditions. This technical feature precisely adapts to the limited AC charging power, rationally allocates the heating functions of the dual motors, and fully utilizes the redundant working capacity of the dual motors, solving the problems of slow battery temperature rise and inability to simultaneously heat the passenger compartment in low-temperature AC charging scenarios.

[0021] In one possible implementation, when the vehicle is not connected to the charging gun and enters the ready state after a cold start, if the temperature of the power battery is lower than a first preset temperature threshold, the dual motors are controlled to perform pulse heating to heat the power battery, while the water pump supplies heat to the passenger compartment.

[0022] In the aforementioned technical solution, this invention addresses the low-temperature cold start condition of vehicles without a charging gun connection. It employs a dual-motor pulse heating system to preheat the power battery, while simultaneously coordinating with a water pump to heat the passenger compartment. This solution is suitable for extreme low-temperature start-up scenarios where vehicles have no external power source and rely entirely on onboard energy. The dual-motor pulse heating rapidly increases the power battery temperature, mitigating the problem of low-temperature performance degradation. Simultaneously, it responds to the passenger compartment's heating needs, overcoming the shortcomings of existing cold start methods that lack effective dual-dimensional heating and exhibit delayed passenger compartment heating. This effectively improves the stability and driving comfort of vehicles during low-temperature cold starts.

[0023] In one possible implementation, when the vehicle is not connected to the charging gun and has entered the cold start ready state, when the power battery temperature rises to the range between the third preset temperature threshold and the first preset temperature threshold, a driving reminder signal is triggered to remind the user that the vehicle can be driven normally, wherein the third preset temperature threshold is less than the first preset temperature threshold.

[0024] In the above technical solution, this invention sets gradient battery temperature thresholds to trigger different driving warning signals, matching user driving authorization prompts based on the real-time battery temperature status. This technical feature can accurately match the power battery heating process, promptly alerting the user when the battery temperature reaches the corresponding driving standard. This effectively avoids problems such as insufficient power and accelerated battery wear caused by driving with an under-temperature battery, while also preventing energy waste due to overheating. It precisely adapts to driving scenarios after cold starts in low temperatures, improving the safety and convenience of vehicle use in low temperatures.

[0025] One possible implementation is that, after the vehicle is not connected to the charging gun and enters the ready state after a cold start, if the vehicle speed is greater than zero and the accelerator pedal opening is less than a preset opening threshold, the front motor is controlled to perform pulse heating and the rear motor to perform degraded heating to ensure the heating needs of driving and the battery, and the passenger compartment is continuously heated by a water pump; when the vehicle is in driving mode, the vehicle speed is greater than zero and the accelerator pedal opening is greater than or equal to the preset opening threshold, the power battery is heated by a positive temperature coefficient heating film, driven by dual motors, and the passenger compartment is heated by a water pump.

[0026] In the above technical solution, this invention identifies the user's power demand based on the accelerator pedal opening during driving, and adaptively switches the motor heating and drive modes. It limits the control logic to dual-motor zone heating under light load conditions and switches to positive temperature coefficient heating film heating with full dual-motor drive under high power demand conditions. This technical feature specifically adapts to the differentiated needs of dynamic driving conditions, solving the problems of traditional heating solutions being unable to simultaneously address driving power output and heating operations, and having poor adaptability to different operating conditions. It can prioritize ensuring the vehicle's power performance or thermal management needs based on real-time driving status, achieving coordinated adaptation of driving power output, battery heating, and passenger compartment heating.

[0027] One possible implementation is that after the vehicle is not connected to the charging gun and enters the ready state after a cold start, if the vehicle speed is zero, the rear motor is controlled to perform pulse heating to heat the power battery, and the front motor, in conjunction with the water pump, performs stall heating to heat the passenger compartment until the power battery temperature is higher than the first preset temperature threshold. Then, the pulse heating and stall heating modes are exited, and the passenger compartment is continuously heated by the residual heat of the motor and the water pump.

[0028] In the above technical solution, this invention addresses the condition where the vehicle is stationary and in no driving demand. It defines a separate heating mode where the rear motor pulses heat the power battery, and the front motor, in conjunction with a water pump, heats the passenger compartment. Once the battery temperature reaches the target level, active heating ceases, relying on residual heat for continued heating. This technical feature fully utilizes the redundancy of dual motors, enabling each motor to independently complete the heating operation for different objects. It precisely adapts to the needs of stationary standby conditions, ensuring both battery preheating effectiveness and passenger compartment comfort while promptly shutting off active heating, reducing ineffective heating energy consumption. This effectively lowers energy consumption during low-temperature standby and improves the economic efficiency of thermal management.

[0029] Secondly, the dual-motor active heating adaptive adjustment system of the present invention is used to implement the dual-motor active heating adaptive adjustment method as described in the present invention, including:

[0030] The information detection module is used to detect the vehicle's charging gun connection status and identify the charging gun type. When the vehicle is connected to the charging gun or in a cold start condition, it collects the vehicle's current environmental parameters, battery status parameters, and overall vehicle operating status parameters.

[0031] The heating decision module is connected to the information detection module by signal. It is used to determine the heating participation status of the front and rear motors based on the collected charging gun type, environmental parameters, battery status parameters and vehicle operating status parameters, match the corresponding motor heating mode, and determine the heating target. The heating target is at least one of the power battery and the vehicle passenger compartment.

[0032] The heating execution module is signal-connected to the heating decision module and is used to control the operation of the corresponding motor to perform the corresponding heating operation based on the matched heating method and the determined heating object.

[0033] The start-stop control module is connected to the heating execution module and is used to detect the power battery temperature and the vehicle air conditioning operation status in real time. Based on the preset target temperature of the power battery and the user's air conditioning operation status, it controls the start and stop of the power battery heating operation and the passenger compartment heating operation accordingly.

[0034] In the above technical solution, corresponding to the aforementioned adjustment method, this invention sets up four functional modules: an information detection module, a heating decision module, a heating execution module, and a start-stop control module, constructing a modular and interconnected adaptive heating system. Each module has a clear division of labor and signal linkage, enabling full-process control of multi-dimensional operating condition parameter acquisition, intelligent heating strategy decision-making, precise execution of heating operations, and condition-linked start-stop. This solves the problems of traditional heating systems, such as single decision-making, rigid control, and low resource utilization. It precisely matches the core logic of this invention's full-domain adaptive heating method, improving the integration and control accuracy of the vehicle's low-temperature thermal management system.

[0035] Thirdly, the vehicle described in this invention includes a vehicle controller, a dual-motor drive mechanism, a power battery, an on-board thermal management mechanism, and a dual-motor active heating adaptive adjustment system as described in this invention. The vehicle controller is connected to the dual-motor drive mechanism, the power battery, the on-board thermal management mechanism, and the dual-motor active heating adaptive adjustment system via signals, and is used to execute active heating control logic to achieve adaptive differentiated heating between the power battery and the passenger compartment in low-temperature environments. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0037] Figure 1 This is a block diagram of a vehicle disclosed in an embodiment of this application;

[0038] Figure 2 This is a block diagram of a dual-motor active heating adaptive adjustment system disclosed in an embodiment of this application;

[0039] Figure 3 This is a flowchart of a dual-motor active heating adaptive adjustment method disclosed in an embodiment of this application;

[0040] Figure 4 This is a comparison curve of the motor winding temperature change under a dual-motor active heating adaptive adjustment method disclosed in this application and a traditional method;

[0041] Figure 5 This is a comparison curve of the power output variation over time between a dual-motor active heating adaptive adjustment method disclosed in this application and a traditional method. Figure 6 This is a flowchart illustrating the battery heating method of a vehicle during a cold start without the charging gun inserted, as disclosed in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Dual-motor drive mechanism; 2. Power battery; 3. Vehicle controller; 4. On-board thermal management mechanism; 5. Dual-motor active heating adaptive adjustment system; 51. Information detection module; 52. Heating decision module; 53. Heating execution module; 54. Start-stop control module. Detailed Implementation

[0044] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0045] Please see Figure 1 , Figure 1 This is a schematic diagram of the vehicle structure disclosed in the embodiments of this application. The vehicle can be, but is not limited to, a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle. One vehicle includes a vehicle controller 3, a dual-motor drive mechanism 1, a power battery 2, an on-board thermal management mechanism 4, and a dual-motor active heating adaptive adjustment system 5 as described in this application. The vehicle controller 3 is signal-connected to the dual-motor drive mechanism 1, the power battery 2, the on-board thermal management mechanism 4, and the dual-motor active heating adaptive adjustment system 5, respectively, and is used to execute active heating control logic to achieve adaptive differentiated heating between the power battery 2 and the passenger compartment in low-temperature environments.

[0046] Please see Figure 2 , Figure 2 This is a schematic diagram of a dual-motor active heating adaptive adjustment system disclosed in an embodiment of this application. The dual-motor active heating adaptive adjustment system, used to implement the dual-motor active heating adaptive adjustment method as described in this invention, includes an information detection module 51, a heating decision module 52, a heating execution module 53, and a start-stop control module 54. The information detection module 51 detects the vehicle charging gun connection status and identifies the charging gun type. When the vehicle is connected to the charging gun or in a cold start condition, it collects the vehicle's current environmental parameters, battery status parameters, and overall vehicle operating status parameters. The heating decision module 52 is signal-connected to the information detection module 51 and determines the heating participation status of the front and rear motors based on the collected charging gun type, environmental parameters, battery status parameters, and overall vehicle operating status parameters. It matches the corresponding motor heating method and determines the heating target, which is at least one of the power battery 2 and the vehicle passenger compartment. The heating execution module 53 is signal-connected to the heating decision module 52 and controls the corresponding motor to perform the corresponding heating operation based on the matched heating method and the determined heating target. The start-stop control module 54 is connected to the heating execution module 53 by signal, and is used to detect the power battery temperature and the vehicle air conditioning operation status in real time. According to the preset target temperature of the power battery and the user's air conditioning operation status, it controls the start and stop of the power battery heating operation and the passenger compartment heating operation.

[0047] This application establishes four major functional modules: an information detection module 51, a heating decision module 52, a heating execution module 53, and a start-stop control module 54, constructing a modular and interconnected adaptive heating system. Each module has a clear division of labor and interconnected signals, enabling full-process control of multi-dimensional operating condition parameter acquisition, intelligent heating strategy decision-making, precise execution of heating operations, and condition-linked start-stop. This solves the problems of traditional heating systems, such as single decision-making, rigid control, and low resource utilization. It precisely matches the core logic of the present invention's full-domain adaptive heating method, improving the integration and control accuracy of the vehicle's low-temperature thermal management system.

[0048] Please see Figure 3 , Figure 3 This is a flowchart of a dual-motor active heating adaptive adjustment method disclosed in an embodiment of this application. The dual-motor active heating adaptive adjustment method includes the following steps:

[0049] The system monitors the charging gun connection status of the vehicle in real time and identifies the charging gun type. When a charging gun is detected to be connected to the vehicle or the vehicle is in a cold start condition, the system collects the vehicle's current environmental parameters, battery status parameters, and overall vehicle operating status parameters.

[0050] Based on the collected charging gun type, environmental parameters, battery status parameters, and vehicle operating status parameters, the heating participation status of the front and rear motors is determined, the corresponding motor heating method is matched, and the heating target is determined. The heating target is at least one of the power battery 2 and the vehicle passenger compartment.

[0051] Based on the matching heating method and the determined object to be heated, the corresponding motor is controlled to operate in order to perform the corresponding heating operation.

[0052] The system monitors the power battery temperature and the vehicle's air conditioning status in real time. When the power battery temperature reaches the preset target temperature, the power battery heating operation is stopped. When the system detects that the user has turned off the vehicle's air conditioning, the passenger compartment heating operation is stopped.

[0053] In the above technical solution, this invention overcomes the limitations of existing technologies that rely solely on a single heating power dimension for heating decisions and only refine and optimize a single heating method. By collecting multi-dimensional information such as vehicle charging gun type, environmental parameters, battery status parameters, and overall vehicle operating status parameters, it constructs a heating decision logic, solving the technical problems of existing dual-motor vehicle models having a single heating decision dimension, fixed control methods, and poor adaptability to operating conditions. Based on the collected multi-dimensional parameters, this invention can determine the heating participation status of the front and rear motors, match the appropriate motor heating method, and accurately identify at least one of the power battery 2 and the vehicle passenger compartment as the heating target. It can differentiate heating strategies according to actual operating conditions, avoiding the limitations of traditional single heating control modes. Simultaneously, this invention sets up heating operation execution and operating condition linkage start-stop logic, which can carry out battery and / or passenger compartment heating operations as needed and accurately start and stop them, effectively activating the redundant working capacity of dual motors, compensating for the shortcomings of traditional solutions that cannot simultaneously address the thermal needs of two heating targets, improving the resource utilization rate and operating condition adaptability of the vehicle's low-temperature thermal management, and effectively improving the battery's low-temperature charging and discharging degradation problem.

[0054] In one possible embodiment, current environmental parameters include ambient temperature. Battery status parameters include battery temperature. Vehicle operating status parameters include information such as power supply status, accelerator pedal position, and gear position.

[0055] In one possible embodiment, different heating methods are selected based on varying battery temperatures, ambient temperatures, and vehicle operating parameters. These methods include plug-in pulse heating, pulse heating, stall heating, degraded heating, positive temperature coefficient (PTC) heating film heating, and coupled heating of various methods. Specifically, battery heating methods primarily include plug-in pulse heating, pulse heating, stall heating, degraded heating, PTC heating film heating, and coupled heating of various methods. This rapidly heats the power battery 2 in low-temperature environments, improving battery charging and discharging performance and quickly restoring the vehicle's power and fuel economy to normal temperature levels. Simultaneously, in low-temperature environments, users also require heating in the passenger compartment. Passenger compartment heating methods primarily include motor stall heating and thermal management water pump heating. Therefore, this embodiment considers not only battery heating but also the passenger compartment heating requirements.

[0056] This application explicitly defines battery heating methods as including plug-in pulse heating, pulse heating, stall heating, degraded heating, positive temperature coefficient heating film heating, and combined heating of multiple methods. It also defines specific heating types suitable for passenger compartment heating, accurately distinguishing the differentiated technical means for battery heating and passenger compartment heating. Compared to the single, fixed heating methods of existing technologies, this invention enriches the options for low-temperature heating in dual-motor vehicles. It allows for matching suitable single or combined heating methods according to different operating conditions and the needs of different heating objects, effectively avoiding the problems of poor adaptability and strong limitations of single heating methods.

[0057] Please see Figure 4 , Figure 4 This is a flowchart illustrating the battery heating control method for a vehicle when a DC charging gun is plugged in, as disclosed in an embodiment of this application. The battery heating control method for the vehicle when a DC charging gun is plugged in includes:

[0058] When the vehicle is connected to a DC charging gun and the vehicle power supply is in the OFF position, if the power battery temperature is lower than the first preset temperature threshold, the dual motors are controlled to perform plug-in pulse heating until the power battery temperature is heated to the first preset temperature threshold. Then, the plug-in pulse heating is stopped, and the power battery 2 enters the normal charging state.

[0059] For example, when a DC charging gun connection is detected and DC charging is started, the temperature of the vehicle's power battery is obtained and the vehicle's power supply setting is determined. If the vehicle's power supply setting is OFF, and the power battery temperature satisfies: T < T1, where T is the power battery temperature and T1 is a first preset temperature threshold, dual-motor plug-in pulse heating is used until T is heated to T1, then the plug-in pulse heating is stopped, and the power battery 2 enters normal charging state.

[0060] This application specifies a unique heating strategy for preheating the power battery 2 by synchronously using pulse heating from the charging gun with both motors simultaneously, targeting the stationary charging condition with DC charging plugs and the vehicle in the OFF position. This technical feature is adapted to the characteristics of stationary charging and external DC power supply conditions, relying on the power at the charging pile to complete battery heating without consuming the battery's own power, thus effectively reducing battery energy loss.

[0061] Please see Figure 4 The vehicle's battery heating control methods when the AC charging gun is plugged in also include:

[0062] When the vehicle is connected to a DC charging gun, the vehicle power supply is in the ON position, the ambient temperature is lower than a preset low temperature threshold, and the user turns on the vehicle's air conditioning, if the power battery temperature is lower than a second preset temperature threshold, the dual motors are controlled to perform plug-in pulse heating; if the power battery temperature is greater than or equal to the second preset temperature threshold and less than or equal to the first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating to heat the power battery 2, and the front motor is controlled to perform stall heating to heat the passenger compartment; if the power battery temperature is greater than the first preset temperature threshold, the power battery 2 is charged normally, and the current state of charge (SOC) of the battery is obtained; if the battery SOC is less than a preset state of charge threshold, the dual motors are controlled to perform stall heating to heat the passenger compartment; if the battery SOC is greater than or equal to the preset state of charge threshold, active heating is stopped, and the residual heat of the motors and the water pump are used to heat the passenger compartment.

[0063] For example, when the vehicle is connected to a DC charging gun and DC charging is started, the temperature of the vehicle's power battery is obtained and the vehicle's power setting is determined. If the vehicle's power setting is ON and the ambient temperature is lower than a preset low temperature threshold, the user needs to turn on the air conditioning, indicating that the vehicle has a need for battery heating and passenger compartment heating. If T < T2, dual-motor plug-in pulse heating is used, where T2 is the second preset temperature threshold; if T2 ≤ T ≤ T1, the rear motor plug-in pulse heating method is used to heat the power battery 2, and the front motor stall heating method is used to heat the passenger compartment; if T > T1, the power battery 2 starts normal charging. If the battery SOC is lower than a preset state of charge threshold at this time, the dual-motor stall heating method is used to heat the passenger compartment; if the battery SOC is greater than or equal to the preset state of charge threshold at this time, active heating is stopped, and the residual heat of the motor is used to heat the passenger compartment and the water pump is turned on to heat the passenger compartment.

[0064] This application addresses the DC charging port and vehicle ON-mode operation by differentiating the dual-motor heating modes and heating targets based on the different temperature ranges of the power battery 2 and the battery's SOC state. Through a tiered control approach—simultaneous dual-motor battery heating in the low-temperature range, dual-motor targeted heating in the medium-temperature range, and adaptive switching of passenger compartment heating modes in the high-temperature range—it achieves precise allocation of heating resources. This specifically solves the problems of uniform and undifferentiated control modes and low utilization of redundant motor resources in existing dual-motor heating solutions. While accurately ensuring the temperature control precision of the power battery 2, it adapts to different thermal demand scenarios, balancing battery heating effect with passenger compartment heating needs, and achieving a balance between heating efficiency and overall vehicle energy economy.

[0065] Please see Figure 5 , Figure 5 This is a flowchart illustrating the battery heating control method of a vehicle when an AC charging gun is plugged in, as disclosed in an embodiment of this application. The battery heating control method of the vehicle when an AC charging gun is plugged in includes:

[0066] When the vehicle is connected to the AC charging gun and the vehicle power supply is in the OFF position, if the power battery temperature is lower than the first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating alone until the power battery temperature is greater than or equal to the first preset temperature threshold, then the plug-in pulse heating is stopped, and the power battery 2 enters the normal charging state.

[0067] For example, upon detecting an AC charging gun connection, AC charging is initiated, the vehicle's power battery temperature is obtained, and the vehicle's power supply status is determined. If the vehicle's power supply status is OFF, and T < T1, single rear motor charging gun pulse heating is used until T ≥ T1, at which point the charging gun pulse heating mode is exited, and power battery 2 begins normal charging.

[0068] This application addresses the stationary charging condition with the AC charging gun and the vehicle in the OFF position, specifying the use of a separate pulse heating method with the rear motor charging gun to preheat the power battery 2. This technical solution is suitable for the low output power characteristics of AC charging piles. Compared to dual-motor synchronous heating, single-motor independent heating can effectively reduce the equipment load and overall energy consumption during the charging heating process while meeting the low-temperature preheating requirements of the power battery 2.

[0069] Please see Figure 5 The vehicle's battery heating control methods when the AC charging gun is plugged in also include:

[0070] When the vehicle is connected to an AC charging gun, the vehicle power supply is in the ON position, the ambient temperature is lower than a preset low temperature threshold, and the user turns on the vehicle's air conditioning, if the power battery temperature is lower than a first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating to heat the power battery 2, and the front motor performs stall heating to heat the passenger compartment; if the power battery temperature is greater than or equal to the first preset temperature threshold, the power battery 2 is charged normally, and the current battery SOC is obtained; if the battery SOC is less than a preset state of charge threshold, the dual motors are controlled to stall heating to heat the passenger compartment; if the battery SOC is greater than or equal to the preset state of charge threshold, active heating is stopped, and the residual heat of the motors combined with the water pump is used to heat the passenger compartment.

[0071] For example, upon detecting an AC charging gun connection, AC charging is initiated, the vehicle's power battery temperature is obtained, and the vehicle's power setting is determined. If the vehicle's power setting is ON and the ambient temperature is below a preset temperature threshold, indicating a user's need to turn on the air conditioning, the vehicle requires both battery heating and passenger compartment heating. If T < T1, the rear motor's charging gun pulses and the front motor's stall heating are used to heat the passenger compartment. If T ≥ T1, power battery 2 begins normal charging, and the current battery SOC is obtained. If the battery SOC is less than a preset state of charge threshold, dual-motor stall heating is used to heat the passenger compartment. If the battery SOC is greater than or equal to the preset state of charge threshold, active heating is discontinued, and the residual heat from the motors is used to heat the passenger compartment, along with the activation of the water pump.

[0072] This application addresses the AC charging port and vehicle ON-mode operation by implementing a tiered heating strategy based on battery temperature and SOC status. It limits the division of labor between the front and rear motors to achieve simultaneous heating of the battery and passenger compartment, and adaptively switches between residual heat heating and PTC auxiliary heating modes under high-temperature normal operating conditions. This technology precisely adapts to the limited power of AC charging, rationally allocates the heating functions of the dual motors, and fully utilizes their redundant capabilities, solving the problems of slow battery temperature rise and inability to simultaneously heat the passenger compartment in low-temperature AC charging scenarios.

[0073] Please see Figure 6 , Figure 6 This is a flowchart illustrating the battery heating method for a vehicle during a cold start without the charging port inserted, as disclosed in an embodiment of this application. The battery heating method for a vehicle during a cold start without the charging port inserted includes:

[0074] When the vehicle is not connected to the charging gun and enters the READY state after a cold start, if the temperature of the power battery is lower than the first preset temperature threshold, the dual motors are controlled to perform pulse heating to heat the power battery 2, and at the same time, the water pump supplies heat to the passenger compartment.

[0075] For example, if no charging gun is detected, the vehicle's power switch is ON, the user presses the brake to enter READY mode, and information such as the vehicle's battery temperature, speed, gear, and accelerator pedal position is obtained. If T < T1, dual-motor pulse heating is used in conjunction with a water pump to heat the passenger compartment.

[0076] This application addresses the low-temperature cold start scenario for vehicles without a charging gun connection, specifying a dual-motor pulse heating preheating strategy for the power battery 2, simultaneously coordinating with a water pump to heat the passenger compartment. This technical solution is suitable for extreme low-temperature start-up scenarios where vehicles have no external power source and rely entirely on onboard energy. The dual-motor pulse heating can rapidly increase the power battery temperature, improving the issue of battery performance degradation at low temperatures, while simultaneously responding to the passenger compartment's heating needs. This overcomes the shortcomings of existing cold start methods, such as the lack of effective dual-dimensional heating and delayed passenger compartment heating, effectively improving the stability and driving comfort of vehicles during low-temperature cold starts.

[0077] Please see Figure 6 The vehicle's battery heating methods during cold starts without the charging gun plugged in also include:

[0078] When the vehicle is not connected to the charging gun and enters the READY state after a cold start, a driving reminder signal is triggered when the power battery temperature rises to the range between the third preset temperature threshold and the first preset temperature threshold. The user is then reminded on the vehicle's central control screen that the vehicle can be driven normally. The third preset temperature threshold is less than the first preset temperature threshold.

[0079] This application sets gradient battery temperature thresholds to trigger different driving warning signals, matching user driving authorization prompts based on the real-time battery temperature status. This technical feature can accurately match the heating process of the power battery 2, promptly alerting the user when the battery temperature reaches the corresponding driving standard. This effectively avoids problems such as insufficient power and accelerated battery wear caused by driving with an under-temperature battery, while also preventing energy waste due to overheating. It precisely adapts to driving scenarios after cold starts in low temperatures, improving the safety and convenience of vehicle use in low temperatures.

[0080] Please see Figure 6 The vehicle's battery heating methods during cold starts without the charging gun plugged in also include:

[0081] When the vehicle is not connected to the charging gun and enters the READY state after a cold start, if the vehicle speed is greater than zero and the accelerator pedal opening is less than a preset threshold, the front motor is controlled to perform pulse heating and the rear motor to perform degraded heating to ensure the heating needs of driving and the battery, and the passenger compartment is continuously heated by a water pump. When the vehicle is in motion, the vehicle speed is greater than zero and the accelerator pedal opening is greater than or equal to a preset threshold, the power battery 2 is heated by a PTC film, driven by dual motors, and the passenger compartment is heated by a water pump.

[0082] This application identifies the user's power demand based on the accelerator pedal opening during driving, and adaptively switches between motor heating and drive modes. It employs a control logic that limits operation to dual-motor zone heating under light load conditions and switches to PTC film heating with full dual-motor drive under high power demand conditions. This technical feature specifically adapts to the differentiated needs of dynamic driving conditions, solving the problems of traditional heating solutions that cannot simultaneously address driving power output and heating operations, and have poor adaptability to different operating conditions. It prioritizes the vehicle's power performance or thermal management needs based on real-time driving status, achieving coordinated adaptation of driving power output, battery heating, and passenger compartment heating.

[0083] Please see Figure 6 The vehicle's battery heating methods during cold starts without the charging gun plugged in also include:

[0084] After the vehicle is not connected to the charging gun and enters the READY state after a cold start, if the vehicle speed is zero, the rear motor is controlled to perform pulse heating to heat the power battery 2, and the front motor, in conjunction with the water pump, performs stall heating to heat the passenger compartment until the temperature of the power battery 2 is higher than the first preset temperature threshold. Then, the pulse heating and stall heating modes are exited, and the passenger compartment is continuously heated by the residual heat of the motor and the water pump. The user is reminded again that it is safe to drive normally at this time.

[0085] This application addresses the condition where the vehicle is stationary and inactive, defining a separate heating mode where the rear motor pulses heats the power battery 2, and the front motor, in conjunction with a water pump, heats the passenger compartment. Once the battery temperature reaches the target level, active heating ceases, relying on residual heat for continued heating. This technical feature fully utilizes the redundancy of dual motors, enabling each motor to independently handle heating of different objects, precisely adapting to the needs of stationary standby conditions. While ensuring effective battery preheating and passenger compartment comfort, it promptly shuts off active heating, reducing ineffective heating energy consumption and effectively lowering energy loss during low-temperature standby, thus improving the economic efficiency of thermal management.

[0086] The examples described above can be modified or altered by those skilled in the art based on the above description, and all such modifications and alterations should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. A dual-motor active heating adaptive adjustment method, characterized in that, Includes the following steps: Real-time detection of the vehicle's charging gun connection status and identification of the charging gun type. When the vehicle is detected to be connected to a charging gun or when the vehicle is in a cold start condition, the current environmental parameters, battery status parameters and vehicle operating status parameters of the vehicle are collected. Based on the collected charging gun type, environmental parameters, battery status parameters and vehicle operating status parameters, the heating participation status of the front and rear motors is determined, the corresponding motor heating method is matched, and the heating target is determined. The heating target is at least one of the power battery (2) and the vehicle passenger compartment. Based on the matching heating method and the determined heating target, the corresponding motor is controlled to perform the corresponding heating operation; the power battery temperature and the vehicle air conditioning operation status are monitored in real time. When the power battery temperature reaches the preset target temperature, the power battery heating operation is stopped. When the user turns off the vehicle air conditioning, the passenger compartment heating operation is stopped.

2. The dual-motor active heating adaptive adjustment method according to claim 1, characterized in that, The heating methods include gun pulse heating, pulse heating, stall heating, degraded heating, positive temperature coefficient heating film heating, and coupling heating of various heating methods.

3. The dual-motor active heating adaptive adjustment method according to claim 1, characterized in that, When the vehicle is connected to a DC charging gun and the vehicle power supply is in the OFF position, if the power battery temperature is less than the first preset temperature threshold, the dual motors are controlled to perform plug-in pulse heating until the power battery temperature is heated to the first preset temperature threshold, then the plug-in pulse heating is stopped, and the power battery (2) enters the normal charging state.

4. The dual-motor active heating adaptive adjustment method according to claim 3, characterized in that, When the vehicle is connected to a DC charging gun, the vehicle power supply is in the ON position, the ambient temperature is less than a preset low temperature threshold, and the vehicle air conditioning is turned on, if the power battery temperature is less than a second preset temperature threshold, the dual motors are controlled to perform plug-in pulse heating; if the power battery temperature is greater than or equal to the second preset temperature threshold and less than or equal to the first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating to heat the power battery (2), and the front motor is controlled to perform stall heating to heat the passenger compartment; if the power battery temperature is greater than the first preset temperature threshold, the power battery (2) is charged normally, and the current battery state of charge is obtained; if the battery state of charge is less than a preset state of charge threshold, the dual motors are controlled to stall heating to heat the passenger compartment; if the battery state of charge is greater than or equal to the preset state of charge threshold, active heating is stopped, and the residual heat of the motors and the water pump are used to heat the passenger compartment.

5. The dual-motor active heating adaptive adjustment method according to claim 1, characterized in that, When the vehicle is connected to the AC charging gun and the vehicle power supply is in the OFF position, if the power battery temperature is less than the first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating alone until the power battery temperature is greater than or equal to the first preset temperature threshold, then the plug-in pulse heating is stopped, and the power battery (2) enters the normal charging state.

6. The dual-motor active heating adaptive adjustment method according to claim 5, characterized in that, When the vehicle is connected to the AC charging gun, the vehicle power supply is in the ON position, the ambient temperature is less than the preset low temperature threshold, and the user turns on the vehicle air conditioning, if the power battery temperature is less than the first preset temperature threshold, the rear motor is controlled to perform plug-in pulse heating to heat the power battery (2), and the front motor performs stall heating to heat the passenger compartment; if the power battery temperature is greater than or equal to the first preset temperature threshold, the power battery (2) is charged normally and the current battery state of charge is obtained; if the battery state of charge is less than the preset state of charge threshold, the dual motors are controlled to stall heating to heat the passenger compartment; if the battery state of charge is greater than or equal to the preset state of charge threshold, active heating is stopped, and the residual heat of the motor is used in conjunction with the water pump to heat the passenger compartment.

7. The dual-motor active heating adaptive adjustment method according to claim 1, characterized in that, When the vehicle is not connected to the charging gun and enters the ready state after cold start, if the temperature of the power battery is less than the first preset temperature threshold, the dual motors are controlled to perform pulse heating to heat the power battery (2), and at the same time, the passenger compartment is heated by the water pump.

8. The dual-motor active heating adaptive adjustment method according to claim 7, characterized in that, When the vehicle is not connected to the charging gun and enters the ready state after a cold start, when the temperature of the power battery rises to the range between the third preset temperature threshold and the first preset temperature threshold, a driving reminder signal is triggered to remind the user that the vehicle can be driven normally. The third preset temperature threshold is less than the first preset temperature threshold.

9. The dual-motor active heating adaptive adjustment method according to claim 8, characterized in that, When the vehicle is not connected to the charging gun and enters the ready state after cold start, if the vehicle speed is greater than zero and the accelerator pedal opening is less than the preset opening threshold, the front motor is controlled to perform pulse heating and the rear motor to perform degraded heating to ensure the heating needs of driving and battery. The water pump continuously supplies heat to the passenger compartment. When the vehicle is in driving state, the vehicle speed is greater than zero and the accelerator pedal opening is greater than or equal to the preset opening threshold, the power battery (2) is heated by the positive temperature coefficient heating film. The dual motor drives the water pump to supply heat to the passenger compartment.

10. The dual-motor active heating adaptive adjustment method according to claim 8, characterized in that, After the vehicle is not connected to the charging gun and enters the ready state after a cold start, if the vehicle speed is zero, the rear motor is controlled to perform pulse heating to heat the power battery (2), and the front motor cooperates with the water pump to perform stall heating to heat the passenger compartment until the temperature of the power battery is higher than the first preset temperature threshold. Then, the pulse heating and stall heating modes are exited, and the passenger compartment is continuously heated by the residual heat of the motor and the water pump.

11. A dual-motor active heating adaptive adjustment system, characterized in that, The method for implementing the dual-motor active heating adaptive adjustment method as described in any one of claims 1-10 includes: The information detection module (51) is used to detect the connection status of the vehicle charging gun and identify the type of charging gun. When the vehicle is connected to the charging gun or in a cold start condition, it collects the current environmental parameters, battery status parameters and vehicle operating status parameters of the vehicle. The heating decision module (52) is connected to the information detection module (51) by signal. It is used to determine the heating participation status of the front and rear motors based on the collected charging gun type, environmental parameters, battery status parameters and vehicle operating status parameters, match the corresponding motor heating mode, and determine the heating target. The heating target is at least one of the power battery (2) and the vehicle passenger compartment. The heating execution module (53) is signal-connected to the heating decision module (52) and is used to control the corresponding motor to perform the corresponding heating operation based on the matched heating method and the determined heating object. The start-stop control module (54) is connected to the heating execution module (53) by signal. It is used to detect the power battery temperature and the vehicle air conditioning operation status in real time, and control the start-stop of the power battery heating operation and the passenger compartment heating operation according to the preset target temperature of the power battery and the user's air conditioning operation status.

12. A vehicle, characterized in that, The system includes a vehicle controller (3), a dual-motor drive mechanism (1), a power battery (2), an on-board thermal management mechanism (4), and a dual-motor active heating adaptive adjustment system (5) as described in claim 11. The vehicle controller (3) is connected to the dual-motor drive mechanism (1), the power battery (2), the on-board thermal management mechanism (4), and the dual-motor active heating adaptive adjustment system (5) respectively, and is used to execute active heating control logic to realize adaptive differentiated heating of the power battery (2) and the passenger compartment in low-temperature environments.

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