Method and device for evaluating maximum charging current of electric drive system, vehicle and medium

Abstract

The invention relates to a maximum charging current evaluation method and device for an electric drive system, a vehicle and a medium, and the method comprises the steps: calculating a step-up ratio according to the maximum output voltage of a charging pile and the bus voltage of a battery pack, querying a first mapping table according to the maximum output voltage, and obtaining the maximum allowable charging current of a power module, querying a second mapping table according to the maximum output voltage and the current step-up ratio to obtain the maximum allowable charging current of the motor, and minimizing the maximum allowable charging current of the power module and the maximum allowable charging current of the motor to obtain the maximum allowable charging current of the electric drive; and according to the maximum output current of the charging pile, the maximum charging current of the battery pack and the maximum allowable charging current of the electric drive, obtaining direct-current boost target charging current of the electric drive system. Therefore, the problem that the actual charging capacity of the electric drive system cannot be exerted due to the fact that the electric drive system with the direct-current boosting function does not consider different maximum currents allowing direct-current boosting charging under different boosting ratios is solved, the charging time is shortened, and the charging efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a maximum charging current evaluation method, device, vehicle and medium for an electric drive system. Background Art

[0002] At present, the penetration rate of electric vehicles is increasing rapidly, while charging time and battery life are still the two major problems that restrict the current development of electric vehicles. Long battery life requires that the automotive power battery has a high capacity, so high-voltage batteries have become the development trend of the industry, but it may affect its charging rate. Due to the wide variety of charging piles in the current market, the construction and iteration of charging piles generally lag behind the development of power battery technology. The voltage of many charging piles is lower than the voltage of the power battery. Therefore, electric vehicles are generally equipped with a DC boost system. In the early days, a separate DC / DC (Direct Current, DC converter) bridge circuit was usually used. In recent years, due to technological advances, a DC boost technology with better cost and multiplexing of the electric drive system has emerged.

[0003] In the related art, when an electric drive system equipped with a DC boost function is used to charge a battery, the electric drive system is usually used to charge at a constant power that meets the usage requirements while the battery temperature rises during the charging time from 0 to 100% SOC (State of Charge). At high SOC, the battery has a lower charging capacity, so the battery's allowable charging current is usually used as the boundary.

[0004] However, since the maximum current allowed for DC boost charging is different under different boost ratios of the electric drive system, the above charging strategy does not fully utilize the actual charging capacity of the electric drive system, and the charging time is long. Therefore, when using the electric drive system DC boost to charge the battery, in addition to considering the battery's own charging strategy, the electric drive system's allowed DC boost charging capacity must also be considered, so the battery charging strategy in the above solution is not applicable.

[0005] In related technologies, such as patent CN114899911A "A method and system for a BOOST power converter based on an electric drive system", current flows out of the motor system and enters the motor controller system, and the motor controller system performs BOOST boost on the current. The boosted current enters the battery for charging, and the current in the battery flows back to the charging pile to realize a closed loop.

[0006] However, the technical solution of the above patent does not involve the maximum allowable output current of the electric drive system under different boost conditions, so it is impossible to implement a method for evaluating the maximum charging current of the electric drive to achieve the effect of improving the charging efficiency, which needs to be solved urgently. Summary of the invention

[0007] The present application provides a maximum charging current evaluation method, device, vehicle and medium for an electric drive system, so as to solve the problem in the related art that an electric drive system with a DC boost function fails to take into account the different maximum currents allowed for DC boost charging under different boost ratios, resulting in the electric drive system failing to exert its actual charging capacity, thereby shortening the charging time and greatly improving the charging efficiency.

[0008] A first aspect of the present application provides a method for evaluating a maximum charging current of an electric drive system, comprising the following steps:

[0009] Obtain the maximum output voltage and current of the charging pile, the maximum charging voltage and current of the vehicle battery pack, and the bus voltage;

[0010] Calculating a current boost ratio according to the maximum output voltage and the bus voltage, querying a preset first mapping table according to the maximum output voltage to obtain a maximum allowable charging current of the power module, and querying a preset second mapping table according to the maximum output voltage and the current boost ratio to obtain a maximum allowable charging current of the motor; and

[0011] The maximum allowable charging current of the electric drive system is obtained based on the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, and the DC boost target charging current of the electric drive system is obtained based on the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, and the DC boost target charging current of the electric drive system is used as the maximum charging current evaluation result.

[0012] According to the above technical means, since the application calculates the boost ratio based on the maximum output voltage of the charging pile and the bus voltage of the battery pack, the maximum output current of the charging pile, the maximum charging current of the battery pack and the maximum allowable charging current of the electric drive are taken as the smaller ones to obtain the DC boost target charging current of the electric drive system. Therefore, the application considers the electric drive system under different boost ratios to obtain the maximum current allowed by the electric drive system for DC boost charging, thereby improving the charging capacity when the electric drive system is used for DC boost charging of the power battery, shortening the charging time and greatly improving the charging efficiency.

[0013] Optionally, in some embodiments, after obtaining the DC boost target charging current of the electric drive system, it also includes: detecting the current output voltage of the charging pile; if the current output voltage is the maximum output voltage, adjusting the current boost ratio to control the output current of the electric drive system to be the DC boost target charging current of the electric drive system.

[0014] According to the above technical means, when the present application detects that the voltage of the charging pile rises to the maximum output voltage, the boost ratio is adjusted, thereby making the output current of the electric drive system the DC boost target charging current of the electric drive system, thereby controlling the size of the output current of the electric drive system to match its allowable DC boost charging capacity.

[0015] Optionally, in some embodiments, after adjusting the current boost ratio and controlling the output current of the electric drive system to be the DC boost target charging current of the electric drive system, it also includes: judging whether the bus voltage is greater than or equal to the maximum charging voltage, or whether the DC boost unavailable flag is received, or whether the DC boost request signal is lost; if the bus voltage is greater than or equal to the maximum charging voltage, or the DC boost unavailable flag is received, or the DC boost request signal is lost, then adjusting the current boost ratio and adjusting the output current of the electric drive system to a preset value according to a preset gradient.

[0016] According to the above-mentioned technical means, the embodiment of the present application compares the bus voltage with the maximum allowable charging voltage of the battery to determine whether the battery controller's DC boost request has a shutdown flag or whether the request signal is lost. Therefore, when the bus voltage exceeds the maximum charging voltage or the request signal is lost, the duty cycle is controlled to make the current decrease at a certain gradient, thereby avoiding failure of the electric drive system due to excessive current and greatly improving the safety of the system.

[0017] Optionally, in some embodiments, before obtaining the maximum output voltage and the maximum output current of the charging pile, it also includes: determining whether the electric drive system is in a preset fault state; if the electric drive system is not in the preset fault state, then feeding back the DC boost available flag, otherwise, feeding back the DC boost unavailable flag.

[0018] According to the above technical means, before evaluating the maximum current of the electric drive system, the embodiment of the present application determines whether the current electric drive system is in an over-temperature or other fault state. If the current electric drive system fails, the DC boost flag is not allowed and is fed back to the corresponding controller. Therefore, the present application can prevent the system DC boost charging and give feedback when the electric drive system cannot work normally, so as to repair the fault in time and protect the vehicle's electric drive system.

[0019] Optionally, in some embodiments, the preset first mapping table is a mapping table between different input voltages and the maximum allowable current of the power module; the preset second mapping table is a mapping table between different voltages, different boost ratios and the maximum allowable charging current of the motor.

[0020] According to the above technical means, the present application obtains a first mapping table of input voltage and maximum allowable current of the power module through a black module test of the power module, and a second mapping table corresponding to the maximum allowable charging current under different input voltages and boost ratios. Therefore, the present application can fully consider the DC boost target charging current of the electric drive system under different input voltages and boost ratios according to the first mapping table and the second mapping table, and give full play to the actual charging capacity of the electric drive system.

[0021] Optionally, in some embodiments, obtaining the maximum allowable charging current of the electric drive system based on the maximum allowable charging current of the power module and the maximum allowable charging current of the motor includes: taking the smaller of the maximum allowable charging current of the power module and the maximum allowable charging current of the motor as the maximum allowable charging current of the electric drive system.

[0022] According to the above technical means, the embodiment of the present application obtains a reasonable allowable charging current for the electric drive DC boost electric drive by reducing the maximum allowable charging current of the power module and the maximum allowable charging current of the motor.

[0023] Optionally, in some embodiments, obtaining the DC boost target charging current of the electric drive system based on the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system includes: obtaining the smaller current value between the maximum output current and the maximum allowable charging current of the electric drive system; obtaining the target current value based on the ratio of the power value corresponding to the smaller current value to the maximum charging voltage, and when the target current value is greater than the maximum charging current, using the maximum charging current as the DC boost target charging current of the electric drive system; otherwise, using the smaller current value as the DC boost target charging current of the electric drive system.

[0024] According to the above technical means, the embodiment of the present application obtains the smaller current value between the maximum output current and the maximum allowable charging current of the electric drive system, and performs power conversion on the value, thereby comparing it with the maximum charging current of the battery, thereby obtaining a reasonable electric drive DC boost target charging current.

[0025] A second aspect of the present application provides a maximum charging current evaluation device for an electric drive system, comprising:

[0026] An acquisition module is used to obtain the maximum output voltage and maximum output current of the charging pile, the maximum charging voltage and maximum charging current of the vehicle battery pack, and the bus voltage;

[0027] a mapping module, configured to calculate a current boost ratio according to the maximum output voltage and the bus voltage, query a preset first mapping table according to the maximum output voltage to obtain a maximum allowable charging current of the power module, and query a preset second mapping table according to the maximum output voltage and the current boost ratio to obtain a maximum allowable charging current of the motor; and

[0028] An evaluation module is used to obtain a maximum allowable charging current of the electric drive system based on the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, and to obtain a DC boost target charging current of the electric drive system based on the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, and to use the DC boost target charging current of the electric drive system as a maximum charging current evaluation result.

[0029] Optionally, in some embodiments, after obtaining the DC boost target charging current of the electric drive system, the evaluation module further includes: a detection unit, used to detect the current output voltage of the charging pile; and a control unit, used to adjust the current boost ratio when the current output voltage is the maximum output voltage, and control the output current of the electric drive system to be the DC boost target charging current of the electric drive system.

[0030] Optionally, in some embodiments, after adjusting the current boost ratio and controlling the output current of the electric drive system to be the DC boost target charging current of the electric drive system, the control unit is further used to: determine whether the bus voltage is greater than or equal to the maximum charging voltage, or whether the DC boost unavailable flag is received, or whether the DC boost request signal is lost; when the bus voltage is greater than or equal to the maximum charging voltage, or the DC boost unavailable flag is received, or the DC boost request signal is lost, adjust the current boost ratio and adjust the output current of the electric drive system to a preset value according to a preset gradient.

[0031] Optionally, in some embodiments, before obtaining the maximum output voltage and the maximum output current of the charging pile, the acquisition module further includes: a judgment unit, used to judge whether the electric drive system is in a preset fault state; a feedback unit, used to feedback the DC boost available flag when the electric drive system is not in the preset fault state, otherwise, feedback the DC boost unavailable flag.

[0032] Optionally, in some embodiments, the preset first mapping table is a mapping table between different input voltages and the maximum allowable current of the power module; the preset second mapping table is a mapping table between different voltages, different boost ratios and the maximum allowable charging current of the motor.

[0033] Optionally, in some embodiments, the evaluation module further includes: a smaller unit, configured to take the smaller of the maximum allowable charging current of the power module and the maximum allowable charging current of the motor as the maximum allowable charging current of the electric drive system.

[0034] Optionally, in some embodiments, the evaluation module also includes: an acquisition unit, used to obtain the smaller current value between the maximum output current and the maximum allowable charging current of the electric drive system; a comparison unit, used to obtain the target current value according to the ratio of the power value corresponding to the smaller current value to the maximum charging voltage, and when the target current value is greater than the maximum charging current, use the maximum charging current as the DC boost target charging current of the electric drive system; otherwise, use the smaller current value as the DC boost target charging current of the electric drive system.

[0035] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the maximum charging current evaluation method for the electric drive system as described in the above embodiment.

[0036] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned method for evaluating the maximum charging current of an electric drive system.

[0037] Beneficial effects of this application:

[0038] (1) The present application can improve the charging capacity when the electric drive system performs DC boost to charge the power battery, shorten the charging time, and greatly improve the charging efficiency;

[0039] (2) This application fully considers the voltage boost ratio of the electric drive system and provides a maximum charging current evaluation method for the electric drive system to give full play to the actual charging capacity of the electric drive system;

[0040] (3) The present application provides a battery charging strategy based on a DC boost charging function. This strategy detects whether the temperature of the electric drive power module, the temperature of the motor stator, and the DC boost request flag signal meet the operating conditions while ensuring the actual charging capacity of the electric drive system, thereby avoiding failures of the electric drive system and protecting system safety.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0043] Figure 1 A flowchart of a method for evaluating a maximum charging current of an electric drive system provided according to an embodiment of the present application;

[0044] Figure 2 A schematic diagram of an electric drive charging system with a DC boost function and its signal transmission according to an embodiment of the present application;

[0045] Figure 3 A schematic diagram of a maximum charging current evaluation method for an electric drive with a DC boost function according to an embodiment of the present application;

[0046] Figure 4 A schematic flow chart of a battery charging strategy for an electric drive with a DC boost function according to an embodiment of the present application;

[0047] Figure 5 A schematic diagram of a battery DC boost charging test condition according to an embodiment of the present application;

[0048] Figure 6 A schematic diagram of a maximum charging current evaluation device for an electric drive system provided according to an embodiment of the present application;

[0049] Figure 7 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application.

[0050] Among them, 10 is a maximum charging current evaluation device of an electric drive system; 100 is an acquisition module, 200 is a mapping module and 300 is an evaluation module; 701 is a memory, 702 is a processor and 703 is a communication interface. DETAILED DESCRIPTION

[0051] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0052] The following describes the maximum charging current evaluation method, device, vehicle and medium of the electric drive system of the embodiment of the present application with reference to the accompanying drawings. In view of the problem that the electric drive system with a DC boost function in the related art mentioned in the above background technology fails to take into account the different maximum currents allowed for DC boost charging under different boost ratios, resulting in the failure to exert the actual charging capacity of the electric drive system, the present application provides a maximum charging current evaluation method for the electric drive system, by obtaining the maximum output voltage and maximum output current of the charging pile, the maximum charging voltage and maximum charging current of the vehicle battery pack, and the bus voltage; calculating the current boost ratio according to the maximum output voltage and the bus voltage, and querying the preset first mapping table according to the maximum output voltage to obtain the maximum allowable charging current of the power module, and querying the preset second mapping table according to the maximum output voltage and the current boost ratio to obtain the maximum allowable charging current of the motor; obtaining the maximum allowable charging current of the electric drive system according to the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, and obtaining the DC boost target charging current of the electric drive system according to the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, and taking the DC boost target charging current of the electric drive system as the maximum charging current evaluation result. Thereby, the problem that the electric drive system with DC boost function in the related technology fails to exert the actual charging capacity of the electric drive system because it does not take into account the different maximum currents allowed for DC boost charging under different boost ratios is solved, the charging time is shortened and the charging efficiency is improved.

[0053] Specifically, Figure 1 A schematic flow chart of a maximum charging current evaluation method for an electric drive system provided in an embodiment of the present application.

[0054] like Figure 1 As shown, the maximum charging current evaluation method of the electric drive system includes the following steps:

[0055] In step S101, the maximum output voltage and maximum output current of the charging pile, the maximum charging voltage and maximum charging current of the vehicle battery pack, and the bus voltage are obtained.

[0056] It should be noted that Figure 2 Schematic diagram of an electric drive charging system with a DC boost function and its signal transmission according to an embodiment of the present application, such as Figure 2 As shown, the electric drive charging system with DC boost function of the present application includes: a charging pile, an electric drive with DC boost function and a power battery. The signals generated by various parts of the system are transmitted through the charging pile controller, the motor controller and the battery controller.

[0057] Specifically, Figure 2As shown, when the vehicle's charging station is connected to the charging pile, the battery controller determines the maximum output voltage and maximum output current of the current charging pile by reading the charging pile interaction message, and the motor controller reads the maximum charging voltage and maximum charging current and bus voltage of the power battery (vehicle battery pack) through CAN (Controller Area Network) communication.

[0058] Optionally, in some embodiments, before obtaining the maximum output voltage and maximum output current of the charging pile, it also includes: determining whether the electric drive system is in a preset fault state; if the electric drive system is not in a preset fault state, then feeding back a DC boost available flag, otherwise, feeding back a DC boost unavailable flag.

[0059] Among them, the preset fault state of the electric drive system in the embodiment of the present application may be a fault such as overheating of the electric drive that affects the operation of the electric drive.

[0060] It should be noted that in order to confirm that the electric drive system of the current vehicle is in normal working condition, before obtaining the maximum output voltage and maximum output current of the charging pile, this application needs to detect whether the electric drive system is in a faulty state. When all indicators of the electric drive system are normal, a signal that the DC boost function can be performed is fed back; otherwise, the DC boost unavailable flag and the electric drive fault code are fed back.

[0061] Specifically, the motor controller feeds back the electric drive DC boost function available flag bit based on the current motor power module temperature and motor stator temperature not exceeding the temperature alarm threshold and the motor controller itself has no faults, and starts the cooling strategy or oil pump control mode under the electric drive DC boost function mode (the strategy is selected according to the electric drive cooling method).

[0062] This ensures that the electric drive system can be charged smoothly, and at the same time, the faulty electric drive can be inspected and repaired in time to improve the safety of the entire vehicle system.

[0063] Furthermore, the battery controller receives the DC boost available flag of the electric drive controller, thereby starting the DC boost function of the electric drive system to charge the battery pack, and sends a request for the charging pile output voltage, requesting that the output voltage be fixed to voltage U0, where U0 is the highest voltage at which the charging pile can stably output peak power, and sends the signal to the motor controller via CAN communication.

[0064] In step S102, the current boost ratio is calculated based on the maximum output voltage and the bus voltage, and the maximum allowable charging current of the power module is obtained by querying the preset first mapping table based on the maximum output voltage, and the maximum allowable charging current of the motor is obtained by querying the preset second mapping table based on the maximum output voltage and the current boost ratio.

[0065] The current boost ratio of the embodiment of the present application is obtained by calculation based on the maximum output voltage and the bus voltage, and the calculation formula is:

[0066]

[0067] Among them, α is the boost ratio, U0 is the highest voltage that the charging pile can stably output peak power, and U dc is the bus voltage.

[0068] In order to enable those skilled in the art to understand the maximum charging current evaluation method of the electric drive system of the present application, the following embodiments will specifically explain the mapping table involved in the present application.

[0069] Optionally, in some embodiments, the preset first mapping table is a mapping table between different input voltages and the maximum allowable current of the power module; the preset second mapping table is a mapping table between different voltages, different boost ratios and the maximum allowable charging current of the motor.

[0070] It is understandable that when the electric drive system is charged by DC boost, the maximum charging current mainly depends on the temperature rise of the electric drive, which is affected by the temperature of the power module, motor stator, and motor rotor. Since the electric drive generally adopts a specific cooling strategy when DC boosting, based on the principles of thermodynamics, the temperature rise of the electric drive is mainly related to the loss of various electronic components. The loss of the electric drive system includes power module switching loss, conduction loss, motor stator copper loss, iron loss, rotor iron loss, and mechanical loss of bearings, gears, etc.

[0071] When the electric drive system performs DC boost, it can be equivalent to a boost chopper circuit. The electric drive does not rotate and the mechanical loss can be ignored. At this time, the input voltage, load current, boost ratio, ripple current, and switching frequency are the biggest factors affecting the temperature rise of the electric drive system. The empirical formula for the loss of the electric drive system and the formula for the loss of the main electrical components and the ripple current derived based on the boost equivalent circuit can refer to the following formula:

[0072] P loss_p =f p (f s ,I Rms ,V in ); (2)

[0073] In the above formula, P loss_p is the switching loss under DC boost, f p is the function representing the switching loss, f s is the switching frequency, I Rms is the load current, V in is the DC boost input current.

[0074] When boosting DC voltage, the ripple current can be equivalent to the following formula:

[0075]

[0076] In the above formula, △I is the inductance ripple current of the motor stator winding, V in is the DC boost input current, D is the ratio of the output voltage to the input voltage difference and the output voltage, L is the equivalent inductance, f s is the switching frequency, the equivalent inductance L is the same as the motor stator scheme and the switching frequency f s When the motor scheme and switching frequency are constant, it can be regarded as a constant, and α is the boost ratio.

[0077] The calculation formula of stator copper loss is expressed as:

[0078]

[0079] In the above formula, P Cu is the motor stator copper loss, m is the number of motor phases, I Rms is the single-phase current effective value, R i is a single-phase resistance. When the motor scheme is certain, the copper loss is positively correlated with the allowable charging current.

[0080] Motor iron loss = hysteresis loss + eddy current loss, which can be calculated by the following formula:

[0081]

[0082] In the above formula, P Fe is the motor iron loss, P HY is the hysteresis loss, P eddy is the eddy current loss, η is the empirical constant, V is the material volume, f s is the switching frequency, k is a coefficient within [1.5, 2.5], B max The maximum magnetic flux density is related to the ripple current amplitude, k Fe,n is the correction factor, P 10 Indicates the loss value per unit volume of material at 1,50Hz (about 1.75W / kg), B n is the magnetic flux density amplitude, m Fe,n is the mass of each part of the material. When the motor solution is determined, η, k, k Fe,n , P 10 , m Fe,n can be regarded as constants, B max and Related to the ripple current size.

[0083] Based on the ripple current calculation formula, the motor iron loss can be equivalent to the following formula:

[0084] P Fe =f Fe (fs ,I Rms ,V in ,α); (6)

[0085] In the above formula, P Fe is the motor iron loss, f Fe is the function representing the motor iron loss, f s is the switching frequency, I Rms is the load current, V in is the DC boost input current, and α is the boost ratio.

[0086] Based on the loss decomposition of the electric drive DC boost function, the switching frequency f s It has a positive effect on reducing ripple, so the maximum switching frequency allowed by the power module is generally used as the control switching frequency during DC boost, which can be regarded as a constant.

[0087] Through the above analysis and the controller strategy of DC boost, this application takes the power module temperature protection temperature as the boundary and designs a DC boost input voltage V in As a control quantity, through experiments with charging output current as a variable, the present application can obtain the maximum allowable output current of the electric drive system under different boost conditions.

[0088] Furthermore, the present application can obtain the first mapping table of input voltage and maximum current allowed by the power module as shown in Table 1 through the power module black module test. The present application uses the motor stator and rotor protection temperature protection threshold as the boundary and the input voltage V in , the boost ratio α is the control variable, and the temperature rise test with the output current as the variable is performed to obtain the second mapping table of the maximum allowable charging current under different input voltages and boost ratios as shown in Table 2.

[0089] Table 1

[0090]

[0091] Table 2

[0092]

[0093] Based on the above embodiments, the present application obtains a first mapping table and a second mapping table, fits the first mapping table and the second mapping table to obtain the minimum envelope, and obtains a preset table of the maximum allowable charging current of the electric drive DC boost under different input voltage-boosting ratios as shown in Table 3.

[0094] Table 3

[0095]

[0096] In addition, it should be noted that Table 1, Table 2 and Table 3 in this embodiment are only for illustration and are not specifically limited here. The data in each cell in the table can be obtained by technical personnel in this field according to actual conditions through limited experiments and the like.

[0097] Therefore, based on the above embodiments, the present application can query the first mapping table to obtain the maximum allowable charging current of the power module according to the highest voltage at which the charging pile can stably output peak power, and query the second mapping table to obtain the maximum allowable charging current of the motor according to the maximum output voltage of the charging pile and the calculated current boost ratio.

[0098] In step S103, the maximum allowable charging current of the electric drive system is obtained according to the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, and the DC boost target charging current of the electric drive system is obtained according to the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, and the DC boost target charging current of the electric drive system is used as the maximum charging current evaluation result.

[0099] Optionally, in some embodiments, the maximum allowable charging current of the electric drive system is obtained based on the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, including: taking the smaller of the maximum allowable charging current of the power module and the maximum allowable charging current of the motor as the maximum allowable charging current of the electric drive system.

[0100] In some embodiments, the motor controller reads the maximum voltage U0 and the maximum output current I of the charging pile that can stably output the peak power through CAN communication. Pile_max , battery pack bus voltage U dc , bus current I dc , the maximum charging current of the battery pack I Bat_max , Maximum charging voltage U Bat_max , Power module temperature T pow , Motor temperature T mot According to the first mapping table (Table 1), the maximum allowable charging current I of the power module is obtained. pow_max , and then, obtain the allowable charging current I of the electric drive DC boost electric drive D_max =min[I pow_max ,I mot_max ](The smaller of the maximum allowable charging current of the power module and the maximum allowable charging current of the motor)

[0101] Optionally, in some embodiments, a DC boost target charging current of the electric drive system is obtained based on the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, including: obtaining the smaller current value of the maximum output current and the maximum allowable charging current of the electric drive system; obtaining the target current value based on the ratio of the power value corresponding to the smaller current value to the maximum charging voltage, and when the target current value is greater than the maximum charging current, using the maximum charging current as the DC boost target charging current of the electric drive system; otherwise, using the smaller current value as the DC boost target charging current of the electric drive system.

[0102] It should be noted that the maximum output current of the charging pile and the maximum allowable charging current of the electric drive system are input currents, while the maximum charging current of the battery is the output current, so the three cannot be directly compared. Therefore, the present application obtains the smaller current value of the maximum output current and the maximum allowable charging current of the electric drive system, and performs power conversion on the value so that it can be compared with the maximum charging current of the battery, thereby obtaining the final DC boost target charging current of the electric drive system.

[0103] Specifically, based on the above charging pile voltage-boost ratio relationship table (Table 2), the maximum allowable charging current I of the electric drive is generated. D_max , the maximum output current I Pile_max and the maximum allowable charging current I of the electric drive system D_max Take the smaller one to get the smaller current value, then the target current value I tar The power value corresponding to the smaller current value and the maximum charging voltage U Bat_max ratio, and then according to the target current value I tar Compared with the maximum charging current, according to the formula I Tar_charge =min[I tar ,I Bat_max ], and finally obtain the target charging current I of the electric drive DC boost Tar_charge .

[0104] Optionally, in some embodiments, after obtaining the DC boost target charging current of the electric drive system, it also includes: detecting the current output voltage of the charging pile; if the current output voltage is the maximum output voltage, adjusting the current boost ratio to control the output current of the electric drive system to be the DC boost target charging current of the electric drive system.

[0105] Specifically, after obtaining the target charging current of the DC boost of the electric drive system, it is necessary to detect whether the voltage at the DC boost input terminal of the electric drive rises to the target voltage U0 (maximum output voltage). When the current output voltage is the maximum output voltage, the electric drive controller adjusts the duty cycle α to control the output current of the electric drive system to be the target charging current I of the DC boost of the electric drive system. Tar_charge .

[0106] Optionally, in some embodiments, after adjusting the current boost ratio and controlling the output current of the electric drive system to be the DC boost target charging current of the electric drive system, it also includes: determining whether the bus voltage is greater than or equal to the maximum charging voltage, or whether a DC boost unavailable flag is received, or whether a DC boost request signal is lost; if the bus voltage is greater than or equal to the maximum charging voltage, or a DC boost unavailable flag is received, or the DC boost request signal is lost, then adjusting the current boost ratio and adjusting the output current of the electric drive system to a preset value according to a preset gradient.

[0107] Among them, the preset value for adjusting the output current of the electric drive system in the embodiment of the present application is 0.

[0108] Specifically, when the system of the embodiment of the present application detects that the temperature of the electric drive power module and the motor stator temperature are greater than the protection threshold or the battery controller sends a DC boost shutdown request flag signal that is lost for a certain period of time, the electric drive system is controlled to stop the DC boost function, and the electric drive controller is adjusted to adjust the duty cycle α, so that the output current of the electric drive system is adjusted to 0 with a certain gradient. This application does not specifically limit the gradient of the output current adjustment of the electric drive system, and those skilled in the art can set it according to actual conditions.

[0109] In order to enable those skilled in the art to further understand the maximum charging current evaluation method of an electric drive with a DC boost function of the present application, the following examples are listed to schematically illustrate the steps of the method.

[0110] Specifically, Figure 3 Schematic diagram of a method for evaluating the maximum charging current of an electric drive with a DC boost function according to an embodiment of the present application. Figure 3 As shown, the specific process of this method is as follows:

[0111] Step S301: The motor controller reads the maximum voltage U0 and the maximum output current I of the charging pile that can stably output peak power through CAN communication. Pile_max , battery pack bus voltage U dc , bus current I dc , the maximum charging current of the battery pack I Bat_max , Maximum charging voltage U Bat_max , Power module temperature T pow , Motor temperature T mot ;

[0112] Step S302: the motor controller generates a voltage U0 and a bus voltage U1 according to the maximum voltage U0 of the peak power that the charging pile can stably output. dc Calculate the boost ratio α = U0 / (U dc +10);

[0113] Step S303: Taking U0 as the input voltage, query the first mapping table to obtain the maximum allowable charging current I of the power module. pow_max ;

[0114] Step S304: Taking U0 as the input voltage, query the second mapping table to obtain the maximum allowable charging current I of the motor. mot_max ;

[0115] Step S305, obtaining the allowable charging current I of the electric drive DC boost electric drive D_max =min[I pow_max ,I mot_max ](The smaller of the maximum allowable charging current of the power module and the maximum allowable charging current of the motor)

[0116] Step S306, obtaining the maximum output current I Pile_max and the maximum allowable charging current I of the electric drive system D_max The smaller current value in the target current value I tar The power value corresponding to the smaller current value and the maximum charging voltage U Bat_max The ratio of the electric drive DC boost target charging current I Tar_charge =min[I tar ,I Bat_max ];

[0117] Step S307, output current I Tar _ charge As the maximum charging current evaluation result.

[0118] Therefore, the present application provides a method for evaluating the maximum charging current of an electric drive with a DC boost charging function, which takes into account the maximum current allowed for DC boost charging of the electric drive system under different boost ratios, thereby giving full play to the actual charging capacity of the electric drive system.

[0119] Based on the above embodiments, the present application also provides a battery charging strategy for the maximum charging current of an electric drive with a DC boost charging function. The following embodiments will specifically describe the steps of this strategy in conjunction with the accompanying drawings.

[0120] In this embodiment, the battery controller obtains the maximum charging voltage of the charging pile through the information exchange of the charging handshake process, thereby determining whether DC boost is required, sending a DC boost start request signal flag to the motor controller and starting the electric drive DC boost function. Specifically, Figure 4 Schematic diagram of the battery charging strategy of the electric drive with DC boost function according to an embodiment of the present application. Figure 4 As shown, the charging strategy of the electric drive system includes the following steps:

[0121] Step S401, the battery controller DC boost request starts the flag bit;

[0122] Step S402, the motor controller detects whether the electric drive has any faults such as over-temperature that affect the operation of the electric drive. If there is no fault, step S403 is executed; if there is a fault in the electric drive, the process jumps to step S404;

[0123] Step S403, starting the DC boost function and feeding back the DC boost available flag, and then executing step S405;

[0124] Step S404, the DC boost flag is not allowed, and a fault code is fed back, and the process ends;

[0125] Step S405, executing a DC boost cooling strategy;

[0126] Step S406, reading the maximum voltage output current, the bus voltage of the battery pack, and the maximum charging voltage allowed by the battery pack that the charging pile can stably output peak power;

[0127] Step S407, sending the charging pile voltage request and calculating the voltage boost ratio;

[0128] Step S408, querying a preset electric drive allowable charging current table to obtain the electric drive allowable charging current;

[0129] Step S409, obtaining a target current value (a ratio of a power value corresponding to a smaller current value of the maximum output current and the maximum allowable current of the electric drive system to a maximum charging voltage), comparing it with the maximum charging current, taking the smaller value of them, and obtaining a target charging current;

[0130] Step S410, detecting that the output voltage of the charging pile rises to the target voltage U0;

[0131] Step S411, adjusting the duty cycle of the electric drive controller to control the output charging current to be the target current;

[0132] Step S412: the bus voltage is greater than or equal to the maximum allowable charging voltage of the battery, or the battery controller DC boost request is turned off, or the request signal is lost;

[0133] Step S413, adjusting the duty cycle so that the charging current drops to 0 with a certain gradient.

[0134] Therefore, the present application can be based on the above-mentioned evaluation method of the maximum charging current of the electric drive with DC boost charging function. When the electric drive system uses DC boost to charge the battery, in addition to considering the charging strategy of the battery itself, the allowable DC boost charging capacity of the electric drive system is also considered, which greatly improves the charging efficiency.

[0135] Based on the above embodiments, the present application uses the maximum charging current evaluation method of the electric drive system to test the vehicle using the electric drive system DC boost to charge the battery, and obtains the following Figure 5 The schematic diagram of the working condition of a battery DC boost charging test is shown in the figure. Figure 5 The broken line -a is the DC boost output voltage, the broken line -b is the charging current, and the broken line -c is the charging power.

[0136] According to the maximum charging current evaluation method of the electric drive system proposed in the embodiment of the present application, the boost ratio is calculated according to the maximum output voltage of the charging pile and the bus voltage of the battery pack, the maximum allowable charging current of the power module is obtained by querying the first mapping table according to the maximum output voltage, the maximum allowable charging current of the motor is obtained by querying the second mapping table according to the maximum output voltage and the current boost ratio, the maximum allowable charging current of the power module and the maximum allowable charging current of the motor are taken as the smaller one to obtain the maximum allowable charging current of the electric drive, the target current value is obtained according to the maximum output current of the charging pile and the maximum allowable charging current of the electric drive, and the target current value and the maximum charging current of the battery pack are taken as the smaller one to obtain the DC boost target charging current of the electric drive system. Thus, the problem that the electric drive system with a DC boost function fails to exert the actual charging capacity of the electric drive system because it does not consider that the maximum current allowed for DC boost charging is different under different boost ratios is solved, the charging time is shortened, and the charging efficiency is improved.

[0137] Next, a maximum charging current evaluation device for an electric drive system according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0138] Figure 6 4 is a block diagram of a maximum charging current evaluation device for an electric drive system according to an embodiment of the present application.

[0139] like Figure 6 As shown, the maximum charging current evaluation device 10 of the electric drive system includes: an acquisition module 100 , a mapping module 200 and an evaluation module 300 .

[0140] Among them, the acquisition module 100 is used to obtain the maximum output voltage and maximum output current of the charging pile, the maximum charging voltage and maximum charging current of the vehicle battery pack, and the bus voltage; the mapping module 200 is used to calculate the current boost ratio according to the maximum output voltage and the bus voltage, and query the preset first mapping table according to the maximum output voltage to obtain the maximum allowable charging current of the power module, and query the preset second mapping table according to the maximum output voltage and the current boost ratio to obtain the maximum allowable charging current of the motor; the evaluation module 300 is used to obtain the maximum allowable charging current of the electric drive system according to the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, and obtain the DC boost target charging current of the electric drive system according to the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, and use the DC boost target charging current of the electric drive system as the maximum charging current evaluation result.

[0141] Optionally, in some embodiments, after obtaining the DC boost target charging current of the electric drive system, the evaluation module 300 further includes: a detection unit and a control unit.

[0142] Among them, the detection unit is used to detect the current output voltage of the charging pile; the control unit is used to adjust the current boost ratio when the current output voltage is the maximum output voltage, and control the output current of the electric drive system to be the DC boost target charging current of the electric drive system.

[0143] Optionally, in some embodiments, after adjusting the current boost ratio and controlling the output current of the electric drive system to be the DC boost target charging current of the electric drive system, the control unit is also used to: determine whether the bus voltage is greater than or equal to the maximum charging voltage, or whether the DC boost unavailable flag is received, or whether the DC boost request signal is lost; when the bus voltage is greater than or equal to the maximum charging voltage, or the DC boost unavailable flag is received, or the DC boost request signal is lost, adjust the current boost ratio and adjust the output current of the electric drive system to a preset value according to a preset gradient.

[0144] Optionally, in some embodiments, before obtaining the maximum output voltage and the maximum output current of the charging pile, the obtaining module 100 further includes: a judgment unit and a feedback unit.

[0145] Among them, the judgment unit is used to judge whether the electric drive system is in a preset fault state; the feedback unit is used to feedback the DC boost available flag when the electric drive system is not in the preset fault state, otherwise, feedback the DC boost unavailable flag.

[0146] Optionally, in some embodiments, the preset first mapping table is a mapping table between different input voltages and the maximum allowable current of the power module; the preset second mapping table is a mapping table between different voltages, different boost ratios and the maximum allowable charging current of the motor.

[0147] Optionally, in some embodiments, the evaluation module 300 further includes: taking small units.

[0148] Among them, the smaller unit is taken to use the smaller one of the maximum allowable charging current of the power module and the maximum allowable charging current of the motor as the maximum allowable charging current of the electric drive system.

[0149] Optionally, in some embodiments, the evaluation module 300 further includes: an acquisition unit and a comparison unit.

[0150] Among them, the acquisition unit is used to obtain the smaller current value between the maximum output current and the maximum allowable charging current of the electric drive system; the comparison unit is used to obtain the target current value according to the ratio of the power value corresponding to the smaller current value to the maximum charging voltage, and when the target current value is greater than the maximum charging current, the maximum charging current is used as the DC boost target charging current of the electric drive system; otherwise, the smaller current value is used as the DC boost target charging current of the electric drive system.

[0151] It should be noted that the above explanation of the embodiment of the maximum charging current evaluation method for an electric drive system is also applicable to the maximum charging current evaluation device for an electric drive system of this embodiment, and will not be repeated here.

[0152] According to the maximum charging current evaluation device of the electric drive system proposed in the embodiment of the present application, the boost ratio is calculated according to the maximum output voltage of the charging pile and the bus voltage of the battery pack, the maximum allowable charging current of the power module is obtained by querying the first mapping table according to the maximum output voltage, the maximum allowable charging current of the motor is obtained by querying the second mapping table according to the maximum output voltage and the current boost ratio, the maximum allowable charging current of the power module and the maximum allowable charging current of the motor are taken as the smaller one to obtain the maximum allowable charging current of the electric drive, the target current value is obtained according to the maximum output current of the charging pile and the maximum allowable charging current of the electric drive, and the target current value and the maximum charging current of the battery pack are taken as the smaller one to obtain the DC boost target charging current of the electric drive system. Thus, the problem that the electric drive system with a DC boost function fails to exert the actual charging capacity of the electric drive system because it does not consider that the maximum current allowed for DC boost charging is different under different boost ratios is solved, the charging time is shortened, and the charging efficiency is improved.

[0153] Figure 7 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0154] A memory 701 , a processor 702 , and a computer program stored in the memory 701 and executable on the processor 702 .

[0155] When the processor 702 executes the program, the maximum charging current evaluation method of the electric drive system provided in the above embodiment is implemented.

[0156] Furthermore, the vehicle also includes:

[0157] The communication interface 703 is used for communication between the memory 701 and the processor 702 .

[0158] The memory 701 is used to store computer programs that can be executed on the processor 702 .

[0159] The memory 701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0160] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0161] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can communicate with each other through an internal interface.

[0162] The processor 702 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0163] This embodiment also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned maximum charging current evaluation method for an electric drive system.

[0164] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0165] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0166] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0167] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0168] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0169] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0170] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0171] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for evaluating the maximum charging current of an electric drive system, characterized in that: The following steps are involved: Obtain the maximum output voltage and current of the charging pile, the maximum charging voltage and current of the vehicle battery pack, and the bus voltage; Calculating a current boost ratio according to the maximum output voltage and the bus voltage, querying a preset first mapping table according to the maximum output voltage to obtain a maximum allowable charging current of the power module, and querying a preset second mapping table according to the maximum output voltage and the current boost ratio to obtain a maximum allowable charging current of the motor; as well as The maximum allowable charging current of the electric drive system is obtained based on the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, and the DC boost target charging current of the electric drive system is obtained based on the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, and the DC boost target charging current of the electric drive system is used as the maximum charging current evaluation result.

2. The method according to claim 1, characterized in that: After obtaining the DC boost target charging current of the electric drive system, the method further includes: Detect the current output voltage of the charging pile; If the current output voltage is the maximum output voltage, the current boost ratio is adjusted to control the output current of the electric drive system to be the DC boost target charging current of the electric drive system.

3. The method according to claim 2, characterized in that After adjusting the current boost ratio and controlling the output current of the electric drive system to be the DC boost target charging current of the electric drive system, the method further includes: Determining whether the bus voltage is greater than or equal to the maximum charging voltage, or whether a DC boost unavailable flag is received, or whether a DC boost request signal is lost; If the bus voltage is greater than or equal to the maximum charging voltage, or the DC boost unavailable flag is received, or the DC boost request signal is lost, the current boost ratio is adjusted to adjust the output current of the electric drive system to a preset value according to a preset gradient.

4. The method according to claim 1, characterized in that: Before obtaining the maximum output voltage and the maximum output current of the charging pile, the method further includes: Determining whether the electric drive system is in a preset fault state; If the electric drive system is not in the preset fault state, the DC boost available flag is fed back; otherwise, the DC boost unavailable flag is fed back.

5. The method according to claim 1, characterized in that The preset first mapping table is a mapping table between different input voltages and the maximum current allowed by the power module; The preset second mapping table is a mapping table between different voltages, different boost ratios and the maximum allowable charging current of the motor.

6. The method according to claim 1, characterized in that The obtaining the maximum allowable charging current of the electric drive system according to the maximum allowable charging current of the power module and the maximum allowable charging current of the motor includes: The smaller one of the maximum allowable charging current of the power module and the maximum allowable charging current of the motor is used as the maximum allowable charging current of the electric drive system.

7. The method according to claim 1, characterized in that The step of obtaining a DC boost target charging current of the electric drive system according to the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system includes: Obtaining a smaller current value between the maximum output current and the maximum allowable charging current of the electric drive system; The target current value is obtained according to the ratio of the power value corresponding to the smaller current value to the maximum charging voltage, and when the target current value is greater than the maximum charging current, the maximum charging current is used as the DC boost target charging current of the electric drive system; otherwise, the smaller current value is used as the DC boost target charging current of the electric drive system.

8. A maximum charging current evaluation device for an electric drive system, characterized in that: include: An acquisition module is used to obtain the maximum output voltage and maximum output current of the charging pile, the maximum charging voltage and maximum charging current of the vehicle battery pack, and the bus voltage; a mapping module, configured to calculate a current boost ratio according to the maximum output voltage and the bus voltage, query a preset first mapping table according to the maximum output voltage to obtain a maximum allowable charging current of the power module, and query a preset second mapping table according to the maximum output voltage and the current boost ratio to obtain a maximum allowable charging current of the motor; as well as An evaluation module is used to obtain a maximum allowable charging current of the electric drive system based on the maximum allowable charging current of the power module and the maximum allowable charging current of the motor, and to obtain a DC boost target charging current of the electric drive system based on the maximum output current, the maximum charging current and the maximum allowable charging current of the electric drive system, and to use the DC boost target charging current of the electric drive system as a maximum charging current evaluation result.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the maximum charging current evaluation method for an electric drive system as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the maximum charging current evaluation method of the electric drive system as described in any one of claims 1 to 7.

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