Control Method for Range-Extended Electric Vehicle in Low-Temperature and Low-Battery Discharge Power Scenarios

Abstract

The present application provides a control method for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario. The method includes: determining the warm-up time of the range extender according to the coolant temperature of the range extender, and controlling the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time; after the warm-up cycle ends, determining the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and controlling the range extender to generate power according to the power generation power; after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, determining the latest driving power output by the battery of the range-extended electric vehicle; calculating the maximum vehicle speed at which the range-extended electric vehicle can be stably driven in the low-temperature and low-battery-discharge-power scenario according to the power generation power of the range extender and the latest driving power output by the battery, and controlling the range-extended electric vehicle to travel according to the maximum vehicle speed.

Description

Technical Field

[0001] This application relates to the technical field of new energy vehicles, and particularly to a control method for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario. Background Art

[0002] In a low-temperature and low-battery-discharge-power scenario, the driving power output by the power battery of a range-extended electric vehicle is relatively low and it is difficult to meet the driving power requirements of the range-extended electric vehicle. At this time, when the range extender is just started, it needs to warm up and be able to generate electricity externally. Therefore, in extremely low-temperature conditions, the current range-extended electric vehicle may have problems such as inability to drive and a significant decline in driving performance. Summary of the Invention

[0003] In view of this, the embodiments of this application provide a control method, device, and range-extended electric vehicle for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario, so as to solve the problems in the prior art that the range-extended electric vehicle cannot drive and the driving performance declines significantly in a low-temperature and low-battery-discharge-power scenario.

[0004] In the first aspect of the embodiments of this application, a control method for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario is provided, including: when it is detected that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, determining the warm-up time of the range extender according to the coolant temperature of the range extender of the range-extended electric vehicle, and controlling the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time; after the warm-up cycle ends, determining the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and controlling the range extender to generate electricity according to the power generation power; after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, determining the latest driving power output by the battery of the range-extended electric vehicle; calculating the highest vehicle speed at which the range-extended electric vehicle can stably drive in a low-temperature and low-battery-discharge-power scenario according to the power generation power of the range extender and the latest driving power output by the battery, and controlling the range-extended electric vehicle to drive according to the highest vehicle speed.

[0005] In a second aspect of the embodiments of the present application, a control device for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario is provided, including: a warm-up module configured to, when detecting that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, determine the warm-up time of the range extender according to the coolant temperature of the range extender of the range-extended electric vehicle, and control the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time; a power generation module configured to, after the warm-up cycle ends, determine the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and control the range extender to generate power according to the power generation power; an energy-saving module configured to, after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, determine the latest driving power output by the battery of the range-extended electric vehicle; a control module configured to calculate the maximum vehicle speed at which the range-extended electric vehicle can stably drive in a low-temperature and low-battery-discharge-power scenario according to the power generation power of the range extender and the latest driving power output by the battery, and control the range-extended electric vehicle to travel according to the maximum vehicle speed.

[0006] In a third aspect of the embodiments of the present application, a range-extended electric vehicle is provided, including a memory, a main control module, and a computer program stored in the memory and executable on the main control module. When the main control module executes the computer program, the steps of the above method are implemented.

[0007] The beneficial effects of the embodiments of the present application compared with the prior art at least include: In the embodiments of the present application, when detecting that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, the warm-up time of the range extender is determined according to the coolant temperature of the range extender of the range-extended electric vehicle, and the engine in the range extender is controlled to perform a warm-up cycle at a preset speed according to the warm-up time; after the warm-up cycle ends, the power generation power of the range extender is determined according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and the range extender is controlled to generate power according to the power generation power; after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, the latest driving power output by the battery of the range-extended electric vehicle is determined; the maximum vehicle speed at which the range-extended electric vehicle can stably drive in a low-temperature and low-battery-discharge-power scenario is calculated according to the power generation power of the range extender and the latest driving power output by the battery, and the range-extended electric vehicle is controlled to travel according to the maximum vehicle speed. By adopting the above technical means, the problems that the range-extended electric vehicle cannot travel and the driving power performance drops greatly in a low-temperature and low-battery-discharge-power scenario in the prior art can be solved, and further, it is ensured that the range-extended electric vehicle can still travel and maintain stable driving power performance in a low-temperature and low-battery-discharge-power scenario, meeting the user's usage requirements and improving user satisfaction. Description of the Drawings

[0008] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for use in the embodiments or the description of the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 is a schematic flowchart of a control method for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario provided by an embodiment of the present application;

[0010] Figure 2 is a schematic flowchart of a method for adaptively presetting thermal management power provided by an embodiment of the present application;

[0011] Figure 3 is a schematic structural diagram of a control device for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario provided by an embodiment of the present application;

[0012] Figure 4 is a schematic structural diagram of a range-extended electric vehicle provided by an embodiment of the present application. Detailed implementation manners

[0013] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are presented to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0014] Figure 1 is a schematic flowchart of a control method for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario provided by an embodiment of the present application. Figure 1 The control method for the range-extended electric vehicle in the low-temperature and low-battery-discharge-power scenario can be executed by a main control module set on the range-extended electric vehicle. Optionally, Figure 1 The control method for the range-extended electric vehicle in the low-temperature and low-battery-discharge-power scenario can also be executed by a computer or a server, or software on the computer or the server. Taking the main control module as the execution entity as an example, the control method for the range-extended electric vehicle in the low-temperature and low-battery-discharge-power scenario includes:

[0015] S101. When it is detected that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, determine the warm-up time of the range extender according to the coolant temperature of the range extender of the range-extended electric vehicle, and control the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time;

[0016] S102, after ending the warm-up cycle, determine the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and control the range extender to generate power according to the power generation power;

[0017] S103, after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, determine the latest driving power output by the battery of the range-extended electric vehicle;

[0018] S104, calculate the highest vehicle speed at which the range-extended electric vehicle can be stably driven in a low-temperature and low-battery discharge power scenario according to the power generation power of the range extender and the latest driving power output by the battery, and control the range-extended electric vehicle to travel at the highest vehicle speed.

[0019] It should be noted that controlling the range extender to perform a warm-up cycle and generating power according to the power generation power can be understood as the cold start stage of the range extender; restricting the power consumption of non-driving electrical appliances, performing energy recovery, and controlling the range-extended electric vehicle to travel at the highest vehicle speed (equivalent to speed-limiting the range-extended electric vehicle at the highest vehicle speed) can be understood as the energy management stage; the embodiment of the present application divides the process of controlling the range-extended electric vehicle in a low-temperature and low-battery discharge power scenario into the cold start stage of the range extender and the energy management stage, and performs corresponding control on the range-extended electric vehicle according to the cold start stage of the range extender and the energy management stage.

[0020] Specifically, different coolant temperatures correspond to different warm-up times. When the coolant temperature is detected, the warm-up time corresponding to the coolant temperature can be determined, or the time counted when the coolant temperature rises to the target temperature during the warm-up cycle can be used as the warm-up time. When the coolant temperature rises to the target temperature, it is the time to end the warm-up cycle. For example, the conventional warm-up speed is r, and the preset speed r1 = r + 300 in the cold start stage of the range extender. The corresponding relationship between the coolant temperature, vehicle speed, and power generation power is stored in the power speed lookup table, and the power generation power corresponding to the coolant temperature and vehicle speed can be found from the power speed lookup table. The power speed lookup table is stored in the electronic control unit of the range-extended electric vehicle. For example, when the water temperature is -30 degrees, the warm-up time is 5s. Then, after 5s, the warm-up cycle ends, and the range extender is controlled to generate power. The devices in the range-extended electric vehicle other than the range extender can be simply regarded as non-driving electrical appliances. The range extender includes an engine and a generator. In a low-temperature and low-battery discharge power scenario, in order to ensure the power consumption demand of the engine, the power consumption of non-driving electrical appliances can be restricted, such as restricting the power consumption of the in-vehicle air conditioner and in-vehicle screen, etc.; in order to ensure the power consumption demand of the engine, energy recovery can also be performed according to the maximum energy recovery power allowed by the range-extended electric vehicle. Denote the current maximum recovery power of the battery as Pd and the current maximum recovery capacity of the motor as Pm. The maximum energy recovery power 。Determine the latest driving power output by the battery, which is to limit the power consumption of non-driving electrical appliances in the original output power of the battery and add the power obtained from energy recovery. Controlling the operation of the range-extended electric vehicle according to the maximum vehicle speed means that the driving speed of the range-extended electric vehicle does not exceed the maximum vehicle speed.

[0021] According to the technical solution provided by the embodiments of the present application, when it is detected that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, determine the warm-up time of the range extender according to the coolant temperature of the range extender of the range-extended electric vehicle, and control the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time; after the warm-up cycle ends, determine the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and control the range extender to generate power according to the power generation power; after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum allowable energy recovery power of the range-extended electric vehicle, determine the latest driving power output by the battery of the range-extended electric vehicle; calculate the maximum vehicle speed at which the range-extended electric vehicle can be stably driven in the low-temperature and low-battery-discharge-power scenario according to the power generation power of the range extender and the latest driving power output by the battery, and control the range-extended electric vehicle to drive according to the maximum vehicle speed. By adopting the above technical means, the problems that the range-extended electric vehicle cannot drive and the driving power performance drops significantly in the low-temperature and low-battery-discharge-power scenario in the prior art can be solved, and further ensure that the range-extended electric vehicle can still drive and maintain stable driving power performance in the low-temperature and low-battery-discharge-power scenario, meet the user's usage requirements, and improve user satisfaction.

[0022] Further, when the following conditions are detected, it is determined that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, including: the driving power output by the battery of the range-extended electric vehicle is lower than the overall vehicle demand power of the range-extended electric vehicle; both the cell temperature and the coolant temperature of the battery are lower than the first preset temperature; the opening degree of the accelerator pedal of the range-extended electric vehicle is greater than the preset angle.

[0023] The overall vehicle demand power is the power required by the range-extended electric vehicle as a whole, including: the power consumption of low-voltage accessories, the thermal management power of the range-extended electric vehicle, and the driving power. The low-voltage accessories are devices installed on the range-extended electric vehicle with a working voltage lower than the preset voltage, such as in-vehicle screens, etc., the thermal management power such as battery thermal management power and passenger compartment thermal management power, etc., and the driving power is the minimum power required to drive the range-extended electric vehicle, which can be the power consumed by the engine. For example, the first preset temperature is zero degree, and the preset angle is 70% of the maximum opening degree of the accelerator pedal.

[0024] It may be that when the above three conditions are detected simultaneously, it is determined that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario; or it may be that when at least the output power is lower than the vehicle demand power and both the cell temperature and the coolant temperature are lower than the first preset temperature, it is determined that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario.

[0025] Further, restricting the power consumption of non-driving electrical appliances in a range-extended electric vehicle includes: setting the priority of the battery thermal management power higher than the priority of the passenger compartment thermal management power to ensure that the cell temperature of the battery rises and the discharge capacity of the battery is improved. Among them, the battery thermal management power and the passenger compartment thermal management power are respectively controlled by the thermistor set on the battery and the thermistor set on the passenger compartment of the range-extended electric vehicle. The non-driving electrical appliances include the thermistor set on the battery and the thermistor set on the passenger compartment; taking the minimum value of the requested power of the thermistor set on the battery and the thermistor set on the passenger compartment and the preset thermal management power as the upper limit of the battery thermal management power and the passenger compartment thermal management power; performing thermal management power restriction on the range-extended electric vehicle according to the priority of the battery thermal management power, the priority of the passenger compartment thermal management power, and the upper limit.

[0026] The priority of the battery thermal management power is higher than the priority of the passenger compartment thermal management power to ensure that the cell temperature of the battery can be increased at the maximum speed, thereby improving the discharge capacity of the battery. The minimum value of the requested power of the thermistor set on the battery and the thermistor set on the passenger compartment (seat) and the preset thermal management power can be taken as the upper limit of the battery thermal management power and the passenger compartment thermal management power. Performing thermal management power restriction on the range-extended electric vehicle according to the priority of the battery thermal management power, the priority of the passenger compartment thermal management power, and the upper limit may be to first satisfy the battery thermal management power and then satisfy the passenger compartment thermal management power, and the upper limits of the battery thermal management power and the passenger compartment thermal management power are the upper limit.

[0027] Further, when the range-extended electric vehicle is a four-wheel drive vehicle, the front-wheel drive of the range-extended electric vehicle is prohibited, and the rear-wheel drive of the range-extended electric vehicle is used.

[0028] When the rear motor is fault-free, the torque output of the front motor is prohibited (front-wheel drive is prohibited, and only rear-wheel drive is used). When the rear motor fails, the front motor is restarted (front-wheel drive is used).

[0029] Figure 2 It is a schematic flow chart of a method for adaptively presetting thermal management power provided by an embodiment of the present application, as Figure 2 shown, including:

[0030] S201, when the cell temperature is lower than the first threshold, the preset thermal management power does not exceed the first preset power;

[0031] S202, when the cell temperature is higher than or equal to the first threshold but lower than the second threshold, the preset thermal management power does not exceed the second preset power;

[0032] S203, when the cell temperature is higher than or equal to the second threshold, the preset thermal management power does not exceed the third preset power;

[0033] Wherein, the first preset power is greater than the second preset power, and the second power is greater than the third preset power.

[0034] For example: when the cell temperature is lower than -20°C, the preset thermal management power does not exceed 5kw at most; when the cell temperature is lower than -10°C and higher than -20°C, the preset thermal management power does not exceed 4kw at most; when the cell temperature is higher than -10°C, the preset thermal management power does not exceed 3kw at most; in addition, when defrosting and defogging are turned on, this power limit is cancelled.

[0035] Furthermore, calculate the maximum speed at which the range extender electric vehicle can stably drive in a low-temperature and low battery discharge power scenario according to the power generation power of the range extender and the latest driving power output by the battery, including:

[0036] ;

[0037] Wherein, V2 is the maximum speed, V1 is the first preset speed, P1 is the latest driving power output by the battery, P2 is the power generation power, and F is the resistance suffered by the range extender electric vehicle at the second preset speed.

[0038] In order to avoid high-power discharge of the battery and the range extender at low temperature, which may damage the battery and the range extender, and allow the user to fully warm up the engine. At the same time, when starting at low temperature, the power is mostly for urban driving. For example, 80km / h (the first preset speed) meets the speed requirements at the starting stage and does not affect the user's driving experience. It is measured that when the cell temperature is -26°C and the low power consumption is 13%, the battery discharge power is only 8kw. When starting the cold vehicle and turning on the heating of the passenger compartment, the vehicle speed can be quickly increased to 50km / h.

[0039] In an optional embodiment, when it is detected that the range extender electric vehicle is in a low-temperature and low battery discharge power scenario, control the range extender electric vehicle to enter the low-temperature energy management mode, and when the cell temperature of the battery is higher than the second preset temperature and the coolant temperature is higher than the third preset temperature, control the range extender electric vehicle to exit the low-temperature energy management mode; when it is detected that the range extender electric vehicle is not in a low-temperature and low battery discharge power scenario, control the range extender electric vehicle to enter the normal energy management mode.

[0040] The low-temperature energy management mode includes the control of the cold start stage and the energy management stage of the range extender.

[0041] In the conventional energy management mode, the priorities of various powers from high to low are: the power consumption of low-voltage accessories in the range-extended electric vehicle, the thermal management power of the range-extended electric vehicle, and the driving power, where the low-voltage accessories are devices provided on the range-extended electric vehicle with a working voltage less than a preset voltage.

[0042] Any combination of the above all optional technical solutions can form an optional embodiment of the present application, which will not be elaborated one by one here.

[0043] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0044] Figure 3 It is a schematic diagram of a control device for a range-extended electric vehicle in a low-temperature and low-battery-discharge-power scenario provided by an embodiment of the present application. As Figure 3 shown, the control device for a range-extended electric vehicle in the low-temperature and low-battery-discharge-power scenario includes:

[0045] A warm-up module 301, configured to determine the warm-up time of the range extender according to the coolant temperature of the range extender of the range-extended electric vehicle when it is detected that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, and control the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time;

[0046] A power generation module 302, configured to determine the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle after the warm-up cycle ends, and control the range extender to generate power according to the power generation power;

[0047] An energy-saving module 303, configured to determine the latest driving power output by the battery of the range-extended electric vehicle after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle;

[0048] A control module 304, configured to calculate the highest vehicle speed at which the range-extended electric vehicle can stably drive in a low-temperature and low-battery-discharge-power scenario according to the power generation power of the range extender and the latest driving power output by the battery, and control the range-extended electric vehicle to travel according to the highest vehicle speed.

[0049] It should be noted that controlling the range extender to perform a warm-up cycle and generate electricity according to the power generation power can be understood as the cold start stage of the range extender; restricting the power consumption of non-driving electrical appliances, performing energy recovery, and controlling the driving of the range-extended electric vehicle according to the maximum vehicle speed (equivalent to limiting the speed of the range-extended electric vehicle according to the maximum vehicle speed) can be understood as the energy management stage; in the embodiments of the present application, the control process of the range-extended electric vehicle in the low-temperature and low-battery discharge power scenario is divided into the cold start stage of the range extender and the energy management stage, and the range-extended electric vehicle is controlled accordingly according to the cold start stage and the energy management stage of the range extender.

[0050] Specifically, different coolant temperatures correspond to different warm-up times. When the coolant temperature is detected, the warm-up time corresponding to the coolant temperature can be determined, or it can also be that the time counted when the coolant temperature rises to the target temperature in the warm-up cycle is the warm-up time, and the time when the coolant temperature rises to the target temperature is the time to end the warm-up cycle. For example, the conventional warm-up speed is r, and the preset speed r1 in the cold start stage of the range extender is r + 300. The corresponding relationship between the coolant temperature, vehicle speed, and power generation power is stored in the power speed lookup table, and the power generation power corresponding to the coolant temperature and vehicle speed can be found from the power speed lookup table. The power speed lookup table is stored in the electronic control unit of the range-extended electric vehicle. For example, when the water temperature is -30 degrees, the warm-up time is 5s, then the warm-up cycle ends after 5s, and the range extender is controlled to generate electricity. The devices in the range-extended electric vehicle other than the range extender can be simply regarded as non-driving electrical appliances. The range extender includes an engine and a generator. In the low-temperature and low-battery discharge power scenario, in order to ensure the power consumption demand of the engine, the power consumption of non-driving electrical appliances can be restricted, such as restricting the power consumption of the in-vehicle air conditioner and in-vehicle screen, etc.; in order to ensure the power consumption demand of the engine, energy recovery can also be performed according to the maximum energy recovery power allowed by the range-extended electric vehicle. Denote the current maximum recovery power of the battery as Pd and the current maximum recovery capacity of the motor as Pm, the maximum energy recovery power . Determining the latest driving power output by the battery is to limit the power consumption of non-driving electrical appliances in the original output power of the battery and add the power obtained from energy recovery. Controlling the driving of the range-extended electric vehicle according to the maximum vehicle speed means that the driving speed of the range-extended electric vehicle does not exceed the maximum vehicle speed.

[0051] According to the technical solution provided by the embodiments of the present application, when it is detected that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, the warm-up time of the range extender is determined according to the coolant temperature of the range extender of the range-extended electric vehicle, and the engine in the range extender is controlled to perform a warm-up cycle at a preset speed according to the warm-up time; after the warm-up cycle ends, the power generation power of the range extender is determined according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and the range extender is controlled to generate power according to the power generation power; after restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, the latest driving power output by the battery of the range-extended electric vehicle is determined; the highest vehicle speed at which the range-extended electric vehicle can be stably driven in the low-temperature and low-battery-discharge-power scenario is calculated according to the power generation power of the range extender and the latest driving power output by the battery, and the range-extended electric vehicle is controlled to travel according to the highest vehicle speed. By adopting the above technical means, the problems that the range-extended electric vehicle cannot travel and the driving power performance drops greatly in the low-temperature and low-battery-discharge-power scenario in the prior art can be solved, and further, it is ensured that the range-extended electric vehicle can still travel and maintain stable driving power performance in the low-temperature and low-battery-discharge-power scenario, meeting the user's usage requirements and improving user satisfaction.

[0052] Optionally, the warm-up module 301 is further configured such that the driving power output by the battery of the range-extended electric vehicle is lower than the vehicle's overall demand power; both the cell temperature and the coolant temperature of the battery are lower than a first preset temperature; and the opening degree of the accelerator pedal of the range-extended electric vehicle is greater than a preset angle.

[0053] Optionally, the energy-saving module 303 is further configured to set the priority of the battery thermal management power higher than the priority of the passenger compartment thermal management power to ensure that the cell temperature of the battery rises and the discharge capacity of the battery is improved, where the battery thermal management power and the passenger compartment thermal management power are respectively controlled by a thermistor provided on the battery and a thermistor provided on the passenger compartment of the range-extended electric vehicle, and the non-driving electrical appliances include the thermistor provided on the battery and the thermistor provided on the passenger compartment; take the minimum value of the requested power of the thermistor provided on the battery and the preset thermal management power of the thermistor provided on the passenger compartment as the maximum limit value of the battery thermal management power and the passenger compartment thermal management power; and perform thermal management power limitation on the range-extended electric vehicle according to the priority of the battery thermal management power, the priority of the passenger compartment thermal management power, and the maximum limit value.

[0054] Optionally, the energy-saving module 303 is further configured to, when the range-extended electric vehicle is a four-wheel drive vehicle, prohibit the front-wheel drive of the range-extended electric vehicle and drive the vehicle through the rear-wheel drive.

[0055] Optionally, the energy-saving module 303 is further configured such that when the cell temperature is lower than the first threshold, the preset thermal management power does not exceed the first preset power; when the cell temperature is higher than or equal to the first threshold but lower than the second threshold, the preset thermal management power does not exceed the second preset power; when the cell temperature is higher than or equal to the second threshold, the preset thermal management power does not exceed the third preset power; wherein, the first preset power is greater than the second preset power, and the second power is greater than the third preset power.

[0056] Optionally, the control module 303 is further configured to calculate the maximum speed at which the range-extended electric vehicle can be stably driven in a low-temperature and low-battery-discharge-power scenario based on the power generation power of the range extender and the latest driving power output by the battery, including:

[0057] ;

[0058] wherein, V2 is the maximum speed, V1 is the first preset speed, P1 is the output power, P2 is the power generation power, and F is the resistance suffered by the range-extended electric vehicle at the second preset speed.

[0059] Optionally, the control module 303 is further configured to control the range-extended electric vehicle to enter the low-temperature energy management mode when it detects that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, and to control the range-extended electric vehicle to exit the low-temperature energy management mode when the cell temperature of the battery is higher than the second preset temperature and the coolant temperature is higher than the third preset temperature; when it detects that the range-extended electric vehicle is not in a low-temperature and low-battery-discharge-power scenario, control the range-extended electric vehicle to enter the normal energy management mode.

[0060] In the normal energy management mode, the priorities of various powers from high to low are: the power consumption of the low-voltage accessories in the range-extended electric vehicle, the thermal management power and the driving power of the range-extended electric vehicle, wherein the low-voltage accessories are devices provided on the range-extended electric vehicle with a working voltage less than the preset voltage.

[0061] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0062] Figure 4 is a schematic diagram of the range-extended electric vehicle 4 provided by the embodiments of the present disclosure. As Figure 4As shown, the range-extended electric vehicle 4 of this embodiment includes: a main control module 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the main control module 401. When the main control module 401 executes the computer program 403, the steps in the above method embodiments are implemented. Alternatively, when the main control module 401 executes the computer program 403, the functions of the various modules / units in the above device embodiments are implemented.

[0063] The range-extended electric vehicle 4 may include, but is not limited to, the main control module 401 and the memory 402. Those skilled in the art can understand that Figure 4 This is only an example of the range-extended electric vehicle 4 and does not constitute a limitation on the range-extended electric vehicle 4. It may include more or fewer components than shown in the figure, or different components.

[0064] The main control module 401 may be a VCU (Vehicle Control Unit), and the memory 402 may be an internal storage unit of the range-extended electric vehicle 4. For example, the hard disk or memory of the range-extended electric vehicle 4. The memory 402 may also be an external storage device of the range-extended electric vehicle 4, such as a plug-in hard disk equipped on the range-extended electric vehicle 4, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. The memory 402 may also include both the internal storage unit and the external storage device of the range-extended electric vehicle 4. The memory 402 is used to store the computer program and other programs and data required by the range-extended electric vehicle.

[0065] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0066] When the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-described embodiment methods of this application, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the main control module, the steps of the above-described various method embodiments can be implemented. The computer program can include computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice within the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0067] The above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A control method for a range-extended electric vehicle under a low-temperature and low-battery-discharge-power scenario, characterized in that, Including: When it is detected that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, determine the warm-up time of the range extender according to the coolant temperature of the range extender of the range-extended electric vehicle, and control the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time; After ending the warm-up cycle, determine the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and control the range extender to generate power according to the power generation power; After restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, determine the latest driving power output by the battery of the range-extended electric vehicle; wherein, the minimum value among the requested power and the preset thermal management power of the thermistor provided on the battery and the thermistor provided on the passenger compartment is used as the upper limit of the battery thermal management power and the passenger compartment thermal management power; Calculate the maximum vehicle speed at which the range-extended electric vehicle can be stably driven in the low-temperature and low-battery-discharge-power scenario according to the power generation power of the range extender and the latest driving power output by the battery, and control the range-extended electric vehicle to travel according to the maximum vehicle speed; The method further includes: When the core temperature of the battery is lower than the first threshold, the preset thermal management power does not exceed the first preset power; When the core temperature is higher than or equal to the first threshold but lower than the second threshold, the preset thermal management power does not exceed the second preset power; When the core temperature is higher than or equal to the second threshold, the preset thermal management power does not exceed the third preset power; Wherein, the first preset power is greater than the second preset power, and the second preset power is greater than the third preset power.

2. The method according to claim 1, characterized in that, When the following conditions are detected, it is determined that the range-extended electric vehicle is in a low-temperature and low-battery-discharge-power scenario, including: The driving power output by the battery of the range-extended electric vehicle is lower than the vehicle's overall demand power; Both the core temperature of the battery and the coolant temperature are lower than the first preset temperature; The opening degree of the accelerator pedal of the range-extended electric vehicle is greater than the preset angle.

3. The method according to claim 1, characterized in that, Restricting the power consumption of non-driving electrical appliances in the range-extended electric vehicle includes: Setting the priority of the battery thermal management power to be higher than the priority of the passenger compartment thermal management power to ensure that the core temperature of the battery rises and the discharge capacity of the battery is improved, wherein the battery thermal management power and the passenger compartment thermal management power are respectively controlled by the thermistor provided on the battery and the thermistor provided on the passenger compartment of the range-extended electric vehicle, and the non-driving electrical appliances include the thermistor provided on the battery and the thermistor provided on the passenger compartment; Performing thermal management power restriction on the range-extended electric vehicle according to the priority of the battery thermal management power, the priority of the passenger compartment thermal management power, and the upper limit value.

4. The method according to claim 3, characterized in that, The method further includes: When the range-extended electric vehicle is a four-wheel drive vehicle, prohibit the front-wheel drive of the range-extended electric vehicle and drive through the rear-wheel drive of the range-extended electric vehicle.

5. The method according to claim 1, characterized in that, Calculating the maximum speed at which the range-extended electric vehicle can stably drive in the low-temperature and low-battery-discharge-power scenario based on the power generation power of the range extender and the latest drive power output by the battery, including: ； Wherein, V2 is the maximum speed, V1 is the first preset speed, P1 is the latest drive power output by the battery, P2 is the power generation power, and F is the resistance suffered by the range-extended electric vehicle at the second preset speed.

6. The method according to claim 1, characterized in that, The method further includes: When it is detected that the range-extended electric vehicle is in the low-temperature and low-battery-discharge-power scenario, controlling the range-extended electric vehicle to enter the low-temperature energy management mode, and when the core temperature of the battery is higher than the second preset temperature and the coolant temperature is higher than the third preset temperature, controlling the range-extended electric vehicle to exit the low-temperature energy management mode; When it is detected that the range-extended electric vehicle is not in the low-temperature and low-battery-discharge-power scenario, controlling the range-extended electric vehicle to enter the normal energy management mode.

7. The method according to claim 6, characterized in that, In the normal energy management mode, the priorities of various powers from high to low are: the power consumption of the low-voltage accessories in the range-extended electric vehicle, the thermal management power of the range-extended electric vehicle, and the drive power, where the low-voltage accessories are devices provided on the range-extended electric vehicle with a working voltage less than the preset voltage.

8. A control device for a range-extended electric vehicle under a low-temperature and low-battery-discharge-power scenario, characterized in that, Including: A warm-up module configured to, when it is detected that the range-extended electric vehicle is in the low-temperature and low-battery-discharge-power scenario, determine the warm-up time of the range extender according to the coolant temperature of the range extender of the range-extended electric vehicle, and control the engine in the range extender to perform a warm-up cycle at a preset speed according to the warm-up time; A power generation module configured to, after ending the warm-up cycle, determine the power generation power of the range extender according to the coolant temperature and the vehicle speed of the range-extended electric vehicle, and control the range extender to generate power according to the power generation power; An energy-saving module configured to, after restricting the power consumption of non-drive electrical appliances in the range-extended electric vehicle and performing energy recovery according to the maximum energy recovery power allowed by the range-extended electric vehicle, determine the latest drive power output by the battery of the range-extended electric vehicle; A control module configured to calculate the maximum speed at which the range-extended electric vehicle can stably drive in the low-temperature and low-battery-discharge-power scenario according to the power generation power of the range extender and the latest drive power output by the battery, and control the range-extended electric vehicle to travel according to the maximum speed; The energy-saving module is further configured to: use the minimum value among the requested power of the thermistor provided on the battery and the thermistor provided in the passenger compartment and the preset thermal management power as the upper limit of the battery thermal management power and the passenger compartment thermal management power; The energy-saving module is further configured such that: when the core temperature of the battery is lower than a first threshold, the preset thermal management power does not exceed a first preset power; when the core temperature is higher than or equal to the first threshold but lower than a second threshold, the preset thermal management power does not exceed a second preset power; when the core temperature is higher than or equal to the second threshold, the preset thermal management power does not exceed a third preset power; wherein, the first preset power is greater than the second preset power, and the second preset power is greater than the third preset power.

9. A range-extended electric vehicle, characterized in that, It includes a memory, a main control module, and a computer program stored in the memory and executable on the main control module. When the main control module executes the computer program, the method described in any one of claims 1 to 7 is implemented.

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