Vehicle charging control method and vehicle

Abstract

The application provides a vehicle charging control method and vehicle, the method comprises the following steps: obtaining a battery SOC value, a battery temperature value, an accelerator pedal opening degree value and a vehicle speed value; in response to the battery SOC value, the battery temperature value, the accelerator pedal opening degree value and the vehicle speed value satisfying a low-temperature charging closed-loop control enabling condition, obtaining an available charging power and an actual charging power of a power battery; obtaining a generator power correction value according to the available charging power and the actual charging power; correcting an original target generator power of a generator according to the generator power correction value to obtain a corrected target generator power; and controlling the generator to generate power according to the corrected target generator power. The method and vehicle can improve the charging capacity of the power battery in a low-temperature environment.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a vehicle charging control method, and a vehicle using the vehicle control method. Background Technology

[0002] For vehicles equipped with a four-wheel drive system Figure 1 A schematic diagram of existing power distribution control technology, such as... Figure 1 As shown, the generator charges the power battery, which in turn supplies power to the vehicle's load equipment, such as PTC, compressor, and accessories. After satisfying the power needs of the vehicle's load equipment, the power battery also meets the power requirements of the front axle motor and the rear axle motor.

[0003] The power consumption of the vehicle's load equipment is calculated based on the input voltage and current of the components. Considering energy loss, the power conversion efficiency also needs to take into account the power conversion effect. If the components are mechanical, the power conversion efficiency also needs to include the conversion effect of the components' own electrical and mechanical energy.

[0004] However, in low-temperature environments, the usable charging power range of the power battery is small. Based on the power distribution control mentioned above, the existence of system power conversion efficiency accuracy or component variations causes control accuracy variations, resulting in low charging capacity for the power battery. Figure 2 The diagram shown illustrates the charging power of existing power batteries. Figure 2 As shown, due to the low precision of system control, there is a large unutilized space between the actual charging power and the target charging power, especially in low-temperature environments where the power battery may not be able to charge. Summary of the Invention

[0005] The purpose of this invention is to at least solve the above-mentioned technical problems. To this end, the first objective of this invention is to propose a vehicle charging control method that can reduce the deviation between the actual charging power and the target charging power and improve the battery charging capability in low-temperature environments.

[0006] To achieve the above objectives, a vehicle charging control method according to a first aspect of the present invention includes: acquiring a battery SOC value, a battery temperature value, an accelerator pedal opening value, and a vehicle speed value; in response to the battery SOC value, battery temperature value, accelerator pedal opening value, and vehicle speed value satisfying the low-temperature charging closed-loop control enable condition, acquiring the available charging power and actual charging power of the power battery; obtaining a generator power correction value based on the available charging power and the actual charging power; correcting the original target power generation of the generator based on the generator power correction value to obtain a corrected generator target power generation; and controlling the generator to generate electricity based on the corrected generator target power generation.

[0007] According to the vehicle charging control method of the present invention, during low-temperature charging, the deviation in the charging power of the power battery is supplemented to the target power of the generator through closed-loop control, and the generator power is adjusted so that the actual charging power of the power battery is closer to the target charging power, thereby reducing the unused power space between the two, improving the charging capacity of the power battery in low-temperature environments, and avoiding the situation where the power battery cannot be charged in low-temperature environments.

[0008] In some embodiments, determining that the SOC value of the power battery, the battery temperature value, the accelerator pedal opening value, and the vehicle speed value meet the low-temperature charging closed-loop control enabling conditions includes:

[0009] The SOC value of the power battery is determined to be less than 15%;

[0010] The battery temperature was determined to be below -20°C.

[0011] The accelerator pedal opening value is determined to be less than or equal to 0%.

[0012] The vehicle speed value is determined to be less than 60 km / h.

[0013] In some embodiments, obtaining a generator power correction value based on the available charging power and the actual charging power includes: subtracting the available charging power from an overcharge tolerance value to obtain a target charging power; obtaining the power difference between the target charging power and the actual charging power; performing a proportional-integral operation based on the power difference to obtain the generator power correction value, or, looking up a logic table based on the power difference to obtain the generator power correction value, wherein the logic table is a mapping table between the power difference and the generator power correction value.

[0014] In some embodiments, obtaining a generator power correction value based on the target charging power and the actual charging power further includes: checking whether the obtained generator power correction value exceeds a correction power threshold range; if the obtained generator power correction value exceeds the correction power threshold range, using the correction power threshold of the correction power threshold range as the final generator power correction value.

[0015] In some embodiments, after obtaining the generator power correction value based on the target charging power and the actual charging power, the method further includes: filtering the generator power correction value.

[0016] In some embodiments, obtaining the actual charging power of the power battery includes: acquiring the current detection value and voltage detection value of the power battery, and obtaining the actual charging power of the power battery based on the current detection value and the voltage detection value; or, acquiring the power consumption of the vehicle load equipment, the power consumption of the front axle motor and the rear axle motor, and obtaining the actual charging power of the power battery based on the power consumption of the vehicle load equipment, the power consumption of the front axle motor and the rear axle motor, and the original target power generation of the generator.

[0017] In some embodiments, correcting the original target power output of the generator according to the generator power correction value to obtain the ideal target power output of the generator includes: obtaining the original target power output of the generator; and performing a summation operation on the original target power output of the generator and the generator power correction value to obtain the corrected target power output of the generator.

[0018] In some embodiments, obtaining the original target power output of the generator includes: when the vehicle is in an idling state, the original target power output of the generator satisfies: Pwr_GM_Tgt=Power_BMS–(P_PTC+P_Com+P_Acc) / EFF_1; where Pwr_GM_Tgt is the original target power output of the generator, Power_BMS is the target charging power of the power battery, P_PTC, P_Com and P_Acc are the required power of the vehicle accessory PTC, compressor and electrical components, and EFF_1 is the first conversion efficiency;

[0019] Alternatively, when the vehicle is in a creeping state, the original target power output of the generator satisfies:

[0020] Pwr_GM_Tgt = Power_BMS – (P_PTC + P_Com + P_Acc) / EFF_1 – (P_TM + P_P4M) / EFF_2; where Pwr_GM_Tgt is the original target power generation of the generator, Power_BMS is the target charging power of the power battery, P_PTC, P_Com and P_Acc are the required power of the vehicle load equipment PTC, compressor and electrical components, EFF_1 is the first conversion efficiency, P_TM is the power required by the front axle motor, P_P4M is the power required by the rear axle motor, and EFF_2 is the second conversion efficiency.

[0021] To achieve the above objectives, a vehicle according to a second aspect of the present invention includes: a power battery, a generator, a front axle motor, and a rear axle motor, wherein the power battery is connected to the generator, the front axle motor, and the rear axle motor respectively; a battery manager for detecting the state of charge (SOC) value of the power battery; a temperature sensor for detecting the battery temperature; a throttle opening detector for detecting the throttle pedal opening value; a speed sensor for detecting the vehicle speed; and a controller connected to the battery manager, the temperature sensor, the throttle opening detector, and the speed sensor, for controlling the generator according to the vehicle control method described above.

[0022] According to the vehicle of the present invention, the controller executes the vehicle control method of the above embodiment to control the generator, realizes closed-loop control of charging in low temperature environment, and charges the power battery. This can reduce the deviation between the actual charging power and the target charging power and improve the charging capability of the power battery in low temperature environment.

[0023] To achieve the above objectives, a vehicle according to a third aspect of the present invention includes: a memory; at least one processor, the at least one processor being communicatively connected to the memory; wherein the memory stores a computer program executable by the at least one processor, and the at least one processor implements the vehicle control method when executing the computer program.

[0024] According to the vehicle of the present invention, by executing the vehicle control method of the above embodiment to control the generator, closed-loop control of charging in low-temperature environment is realized to charge the power battery, which can reduce the deviation between the actual charging power and the target charging power and improve the charging capability of the power battery in low-temperature environment.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 A schematic diagram of power distribution control in the prior art;

[0028] Figure 2 A schematic diagram illustrating the charging power of existing power batteries;

[0029] Figure 3 This is a schematic diagram of a vehicle four-wheel drive system architecture according to an embodiment of the present invention;

[0030] Figure 4 This is a flowchart of a vehicle charging control method according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the charging power of a power battery after adopting low-temperature charging closed-loop control according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the power distribution control process in a vehicle charging control method according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the power distribution control process in a vehicle charging control method according to another embodiment of the present invention;

[0034] Figure 8 This is a block diagram of a vehicle according to an embodiment of the present invention;

[0035] Figure 9 This is a block diagram of a vehicle according to a third aspect embodiment of the present invention. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. These and other aspects of the embodiments of the present invention will become clear from the following description and accompanying drawings. In these descriptions and drawings, some specific implementations of the embodiments of the present invention are specifically disclosed to illustrate some ways of carrying out the principles of the embodiments of the present invention; however, it should be understood that the scope of the embodiments of the present invention is not limited thereto. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0037] Figure 3 This is a schematic diagram of a vehicle four-wheel drive system architecture according to an embodiment of the present invention, as shown below. Figure 3 As shown, the power battery provides power to the front and rear axle motors, while the generator charges the power battery. In addition, the power battery can also power vehicle load equipment such as PTCs, compressors, and accessories.

[0038] Figure 4 This is a flowchart of a vehicle charging control method according to an embodiment of the present invention, such as... Figure 4 As shown, the vehicle charging control method of this embodiment includes at least the following steps S1-S6.

[0039] S1 obtains the SOC value of the power battery, the battery temperature value, the accelerator pedal opening value, and the vehicle speed value.

[0040] In this embodiment, the SOC value of the power battery can be monitored by the battery manager, the battery temperature value can be detected by the temperature sensor, the accelerator pedal opening value can be detected by the opening sensor, and the vehicle speed value can be detected by the vehicle speed sensor or calculated by the processor.

[0041] S2, in response to the power battery SOC value, battery temperature value, accelerator pedal opening value and vehicle speed value meeting the low temperature charging closed-loop control enable conditions, obtains the target charging power and actual charging power of the power battery.

[0042] The low-temperature charging closed-loop control enable condition can be understood as the activation of the low-temperature closed-loop control logic when the condition is met. The vehicle control method of this embodiment of the invention addresses the problem that the low charging capacity of the power battery in low-temperature environments can easily cause the power battery to fail to charge. Therefore, it considers whether the battery temperature, battery SOC value, throttle opening and vehicle speed meet the set conditions for low-temperature charging control to determine whether low-temperature charging closed-loop control can be activated.

[0043] In some embodiments, determining that the SOC value of the power battery, the battery temperature value, the accelerator pedal opening value, and the vehicle speed meet the enabling conditions for low-temperature charging closed-loop control includes: determining that the SOC value of the power battery is less than 15%, meaning that the battery SOC value is low and can be charged, avoiding energy waste or overcharging; determining that the battery temperature value is below -20°C, meaning that this is a low-temperature environment, which may cause the power battery to fail to charge; determining that the accelerator pedal opening value is less than or equal to 0%, meaning that the vehicle is not accelerating; and determining that the vehicle speed is less than 60 km / h, meaning that it is idling or slow. If the enabling conditions for low-temperature charging closed-loop control are met, the low-temperature closed-loop control strategy is activated.

[0044] It should be noted that the above is an example of a low-temperature charging closed-loop control enable condition of the present invention. The specific conditions can also be adjusted based on the actual situation, for example, by adjusting the specific condition threshold.

[0045] To avoid overcharging, the target charging power of the power battery can be a certain percentage of the battery's available charging power or a combination of both, with a certain capacitance value. For example, if the available charging power is 100 watts, the target charging power could be 95 watts, 90 watts, etc. The available charging power of the power battery can be the battery's maximum allowable charging power.

[0046] The actual charging power can be calculated from the charging voltage and charging current of the power battery.

[0047] In some embodiments, the available charging power of the power battery is obtained, and the difference between the available charging power and the overcharge tolerance value is calculated to obtain the target charging power value. The overcharge tolerance value can be understood as a tolerance value set to avoid overcharging, such as 5 watts, 10 watts, etc. mentioned above.

[0048] In some embodiments, the current and voltage detection values ​​of the power battery are acquired, and the actual charging power of the power battery is obtained based on these values. For example, the actual charging power is equal to the product of the current and voltage. This method of obtaining the actual charging power of the power battery is accurate and fast, which can improve the accuracy and timeliness of low-temperature closed-loop control.

[0049] Alternatively, the power consumption of the vehicle's load equipment, the front axle motor, and the rear axle motor can be obtained, and the actual charging power of the power battery can be calculated based on these power consumptions. Since the power consumption of the vehicle's load equipment is actually provided by the power battery, the actual charging power of the power battery can be calculated using these figures during low-temperature charging. For example, the actual charging power of the power battery can be equivalent to the sum of the power consumption of the vehicle's load equipment, the front axle motor, and the rear axle motor, taking into account conversion efficiency. Note that the power of the front axle motor and the rear axle motor is zero at idle speed.

[0050] S3, obtains the generator power correction value based on the target charging power and the actual charging power.

[0051] In this embodiment, the generator power correction value can be obtained by performing a PI calculation based on the power difference between the target charging power and the actual charging power, or by looking up a table based on the power difference, or by other applicable methods. The power correction value can be positive or negative.

[0052] Specifically, the power difference between the target charging power and the actual charging power is obtained, and a proportional-integral operation is performed based on the power difference to obtain the generator power correction value. Alternatively, the generator power correction value is obtained by looking up a logic table based on the power difference, where the logic table is a mapping table between the power difference and the generator power correction value.

[0053] S4, correct the original target power output of the generator according to the generator power correction value to obtain the corrected target power output of the generator.

[0054] The original target power output of the generator can be the target control power of the generator without starting the low-temperature charging closed-loop control. However, as described in the background section of this application, the original target power output of the generator may result in low charging capacity of the power battery, causing the actual charging power to deviate far from the target charging power. Therefore, this application corrects the original target power output of the generator according to the generator power correction value to reduce the deviation between the actual charging power and the target charging power.

[0055] Specifically, the original target power output of the generator is obtained, which is the power required to drive the vehicle load equipment and the front and rear axle motors when the low-temperature charging closed-loop control is not activated. The original target power output of the generator is then summed with the generator power correction value to obtain the corrected target power output of the generator.

[0056] S5 controls the generator to generate electricity based on the corrected target generator power output.

[0057] In other words, in low-temperature environments, the charging capacity of the power battery is low. Controlling the generator to generate power based on the original target power output of the generator to charge the power battery will not achieve the target charging power, and may even result in the power battery not being able to charge. In this embodiment, the deviation in the charging power of the power battery caused by the low-temperature charging closed-loop control is supplemented to the target power output of the generator. The target power output of the generator is adjusted. For example, if the current target power output of the generator cannot make the actual power output of the power battery reach the target charging power, the target power output of the generator is increased. This can increase the actual power output of the power battery and make it closer to its target charging power. This can improve the charging capacity of the power battery in low-temperature environments and avoid the situation where it cannot be charged at low temperatures.

[0058] Figure 5 This is a schematic diagram of the charging power of a power battery after adopting low-temperature charging closed-loop control according to an embodiment of the present invention, as shown below. Figure 5 As shown, after adopting low-temperature charging closed-loop control, the actual charging power changed from curve P1 (when the low-temperature charging closed-loop control logic was not activated) to curve P2, which is closer to the target charging power, reducing the unused space between the two and improving the charging capacity of the power battery in low-temperature environments.

[0059] In some embodiments, Figure 6 This is a schematic diagram of power distribution control in a vehicle control method according to an embodiment of the present invention. Figure 6As shown, in the state where the low-temperature charging closed-loop control is not activated, the original target power output of the generator is determined. The original target power output of the generator has certain upper and lower limits. Within the range of the upper and lower limits, the generator is controlled to generate power to charge the power battery. The available power of the power battery supplies power to the vehicle load equipment, providing the power required by the vehicle load equipment, such as the power of the PTC, the power of the compressor, and the power of accessories. The accessories may include, for example, multimedia, navigation, and prompting devices. When the vehicle is in motion, it is also necessary to provide the required drive power for the front axle motor and the rear axle motor.

[0060] Specifically, the system acquires the SOC value of the power battery, battery temperature, accelerator pedal opening value, and vehicle speed in real time. When these values ​​meet the low-temperature closed-loop charging control enable conditions, an enable signal (ENABLE) is issued to initiate the low-temperature charging closed-loop control. The target charging power is obtained based on the available charging power of the battery. A generator power correction value is obtained based on the target charging power and the actual charging power, for example, through PI calculation or table lookup correction. This correction value is provided to the generator's original target power input. In other embodiments, during software design, the correction value can also be provided to the generator's original target power output. Figure 7 As shown, the two values ​​are summed to obtain the corrected target generator power output, and the generator operation is controlled according to the corrected target generator power output to charge the power battery. This closed-loop control is then implemented. Figure 5 As shown, this allows the actual charging power of the power battery to be closer to the target charging power, avoiding situations where the battery cannot be charged and improving the charging capability of the power battery in low-temperature environments.

[0061] In some embodiments of the present invention, when the vehicle is in idling condition, the original target power output of the generator satisfies: Pwr_GM_Tgt=Power_BMS–(P_PTC+P_Com+P_Acc) / EFF_1; where Pwr_GM_Tgt is the original target power output of the generator, Power_BMS is the target charging power of the power battery, P_PTC, P_Com and P_Acc are the required power of the vehicle accessory PTC, compressor and electrical components, which can be obtained by detecting current and voltage signals through current and voltage sensors and then calculating the power value, and EFF_1 is the first conversion efficiency.

[0062] Therefore, under idling conditions, the corrected generator target output power, Power_GM, satisfies Power_GM = Power_BMS – (P_PTC + P_Com + P_Acc) / EFF_1 + P_correction, where P_correction is a correction value, such as a PI correction value or a lookup table correction. Controlling generator operation with this corrected generator target output power can improve the charging capacity of the power battery, making the actual charging power of the power battery closer to the target charging power, and avoiding situations where the power battery cannot charge due to insufficient charging capacity in low-temperature environments.

[0063] In other embodiments, when the vehicle is in a creeping state, the original target power output of the generator satisfies:

[0064] Pwr_GM_Tgt = Power_BMS – (P_PTC + P_Com + P_Acc) / EFF_1 – (P_TM + P_P4M) / EFF_2; where Pwr_GM_Tgt is the original target power generation of the generator, Power_BMS is the target charging power of the power battery, P_PTC, P_Com and P_Acc are the required power of the vehicle load equipment PTC, compressor and electrical components, EFF_1 is the first conversion efficiency, P_TM is the power required by the front axle motor, P_P4M is the power required by the rear axle motor, and EFF_2 is the second conversion efficiency.

[0065] Therefore, under creeping conditions, the corrected generator target output power Power_GM satisfies Power_GM = Power_BMS – (P_PTC + P_Com + P_Acc) / EFF_1 – (P_TM + P_P4M) / EFF_2 + P_correction, where P_correction is a correction value such as a PI correction value or a lookup table correction. Controlling generator operation with this corrected generator target output power can improve the charging capacity of the power battery, making the actual charging power of the power battery closer to the target charging power, and avoiding situations where the power battery cannot charge due to insufficient charging capacity in low-temperature environments.

[0066] Furthermore, in some embodiments, such as Figure 6As shown, to avoid errors in the corrected power, upper and lower thresholds (LIMITATION) are set to determine whether the obtained generator power correction value exceeds the threshold range. If the obtained generator power correction value exceeds the threshold range, the corrected power threshold within the threshold range is used as the final generator power correction value. For example, if it is higher than the upper limit of the correction power, the upper limit is used as the generator power correction value; conversely, if it is lower than the lower limit of the correction power, the lower limit is used as the generator power correction value. The correction power threshold can be set based on prior large-scale data statistics, thereby reducing large deviations in the correction value and improving the accuracy of the low-temperature charging closed-loop control correction.

[0067] Furthermore, in some embodiments, such as Figure 6 As shown, after obtaining the generator power correction value based on the target charging power and the actual charging power, the generator power correction value can be filtered, and then summed with the original target generator power. For example, performing RAMP filtering on the generator power correction value can reduce interference signals and improve the accuracy of the low-temperature charging closed-loop control correction.

[0068] In summary, the vehicle control method of this invention, in a low-temperature environment, activates a low-temperature charging closed-loop control strategy in response to the power battery SOC value, battery temperature value, accelerator pedal opening value, and vehicle speed value meeting the low-temperature closed-loop charging control enable conditions. Based on the target charging power and actual charging power of the power battery, corrections are made, and the original target power generation of the generator is adjusted according to the correction value, thus achieving charging closed-loop control. This reduces the deviation between the actual charging power and the target charging power of the power battery, improves the charging capacity of the power battery in low-temperature environments, and avoids situations where charging is impossible.

[0069] Based on the vehicle control method of the above embodiments, the vehicle according to the second aspect of the present invention is described below.

[0070] Figure 8 This is a block diagram of a vehicle according to an embodiment of the present invention, such as... Figure 8 As shown, vehicle 1 includes a power battery 10, a generator 20, a front axle motor 30, a rear axle motor 40, a battery manager 50, a temperature sensor 60, a throttle opening detector 70, a speed sensor 80, and a controller 90.

[0071] The power battery 10 is connected to the generator 20, the front axle motor 30 and the rear axle motor 40 respectively; the battery manager 50 is used to detect the SOC value of the power battery; the temperature sensor 60 is used to detect the battery temperature value; the throttle opening detector 70 is used to detect the throttle pedal opening value; and the speed sensor 80 is used to detect the vehicle speed value.

[0072] The controller 90 is connected to the battery manager 50, temperature sensor 60, throttle opening detector 70 and speed sensor 80, and is used to control the generator to generate electricity according to the vehicle control method of the above embodiment.

[0073] According to the vehicle 1 of the present invention, the controller 90 executes the vehicle control method of the above embodiment to control the generator 20, realizes closed-loop control of charging in low temperature environment, and charges the power battery 10. This can reduce the deviation between the actual charging power and the target charging power of the power battery, improve the charging capacity of the power battery in low temperature environment, and avoid the situation where the power battery cannot be charged in low temperature environment.

[0074] Figure 9 This is a block diagram of a vehicle according to a third aspect embodiment of the present invention. Figure 9 As shown, vehicle 1 includes a memory 100 and at least one processor 200. The memory 100 may be a computer-readable medium.

[0075] At least one processor 200 is communicatively connected to a memory 100; wherein the memory 100 stores a computer program that can be executed by at least one processor 200, and when the at least one processor 200 executes the computer program, it implements the vehicle control method described in the above embodiment.

[0076] According to the vehicle 1 of the present invention, by executing the vehicle control method of the above embodiment to control the generator, a closed-loop control for charging in low-temperature environment is realized to charge the power battery. This can reduce the deviation between the actual charging power and the target charging power, improve the charging capacity of the power battery in low-temperature environment, and avoid the situation where the power battery cannot be charged in low-temperature environment.

[0077] In the description of this specification, any process or method described in the flowcharts or otherwise herein may be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0078] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0079] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0080] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0081] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0082] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0083] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0084] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0085] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vehicle charging control method, characterized in that, include: Obtain battery SOC value, battery temperature value, accelerator pedal opening value, and vehicle speed value; In response to the battery SOC value, battery temperature value, accelerator pedal opening value and vehicle speed value satisfying the low temperature charging closed-loop control enable condition, the available charging power of the power battery and the actual charging power of the power battery are obtained. The generator power correction value is obtained based on the available charging power and the actual charging power; The original target power output of the generator is corrected according to the generator power correction value to obtain the corrected target power output of the generator; The generator is controlled to generate power according to the revised target power output of the generator; Among these, determining whether the power battery SOC value, battery temperature value, accelerator pedal opening value, and vehicle speed meet the enabling conditions for low-temperature charging closed-loop control includes: The SOC value of the power battery is determined to be less than 15%; The battery temperature was determined to be below -20°C. The accelerator pedal opening value is determined to be less than or equal to 0%; The vehicle speed value is determined to be less than 60 km / h; The process of obtaining the generator power correction value based on the available charging power and the actual charging power includes: The target charging power is obtained by subtracting the available charging power from the overcharge tolerance value. Obtain the power difference between the target charging power and the actual charging power; The generator power correction value can be obtained by performing a proportional-integral operation based on the power difference, or by looking up a logic table based on the power difference, wherein the logic table is a mapping table between the power difference and the generator power correction value.

2. The vehicle charging control method according to claim 1, characterized in that, The generator power correction value is obtained based on the target charging power and the actual charging power, and further includes: Determine whether the obtained generator power correction value exceeds the correction power threshold range; If the obtained generator power correction value exceeds the correction power threshold range, the correction power threshold of the correction power threshold range shall be used as the final generator power correction value.

3. The vehicle charging control method according to claim 2, characterized in that, After obtaining the generator power correction value based on the target charging power and the actual charging power, the method further includes: filtering the generator power correction value.

4. The vehicle charging control method according to claim 1, characterized in that, Obtaining the actual charging power of the power battery includes: The current and voltage detection values ​​of the power battery are obtained, and the actual charging power of the power battery is obtained based on the current and voltage detection values. Alternatively, the power consumption of the vehicle's load equipment, the power consumption of the front axle motor and the rear axle motor, and the original power generation of the generator can be obtained, and the actual charging power of the power battery can be obtained based on the power consumption of the vehicle's load equipment, the power consumption of the front axle motor and the rear axle motor, and the original power generation of the generator.

5. The vehicle charging control method according to claim 1, characterized in that, The original target power output of the generator is corrected according to the generator power correction value to obtain the ideal target power output of the generator, including: Obtain the original target power output of the generator; The original target power output of the generator is summed with the corrected power output of the generator to obtain the corrected target power output of the generator.

6. The vehicle charging control method according to claim 5, characterized in that, Obtaining the original target power output of the generator includes: When the vehicle is idling, the original target power output of the generator satisfies: Pwr_GM_Tgt= Power_BMS – (P_PTC + P_Com + P_Acc) / EFF_1; Wherein, Pwr_GM_Tgt is the original target power generation of the generator, Power_BMS is the target charging power of the power battery, P_PTC, P_Com and P_Acc are the required power of the vehicle accessory PTC, compressor and electrical components, and EFF_1 is the first conversion efficiency; Alternatively, when the vehicle is in a creeping state, the original target power output of the generator satisfies: Pwr_GM_Tgt = Power_BMS – (P_PTC + P_Com + P_Acc) / EFF_1– (P_TM + P_P4M) / EFF_2; Wherein, Pwr_GM_Tgt is the original target power generation of the generator, Power_BMS is the target charging power of the power battery, P_PTC, P_Com and P_Acc are the required power of the vehicle load equipment PTC, compressor and electrical accessories, EFF_1 is the first conversion efficiency, P_TM is the power required by the front axle motor, P_P4M is the power required by the rear axle motor, and EFF_2 is the second conversion efficiency.

7. A vehicle, characterized in that, include: The system includes a power battery, a generator, a front axle motor, and a rear axle motor, wherein the power battery is connected to the generator, the front axle motor, and the rear axle motor respectively. Battery manager, which is used to detect the SOC value of the power battery; A temperature sensor, used to detect the battery temperature value; Throttle opening detector, the throttle opening detector is used to detect the throttle pedal opening value; Speed ​​sensor, the speed sensor being used to detect vehicle speed; A controller, connected to the battery manager, the temperature sensor, the throttle opening detector, and the speed sensor, is used to control the generator according to any one of claims 1-6.

8. A vehicle, characterized in that, include: Memory; At least one processor, wherein the at least one processor is communicatively connected to the memory; The memory stores a computer program that can be executed by the at least one processor, and when the at least one processor executes the computer program, it implements the vehicle charging control method according to any one of claims 1-6.

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