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

Abstract

The application relates to a maximum charging current evaluation method and device of an electric drive system, a vehicle and a medium. The method comprises the following steps: calculating a boost 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 to obtain a maximum allowed charging current of a power module; querying a second mapping table according to the maximum output voltage and the current boost ratio to obtain a maximum allowed charging current of a motor; taking the smaller one of the maximum allowed charging current of the power module and the maximum allowed charging current of the motor to obtain a maximum allowed charging current of the electric drive; and obtaining a direct-current boost target charging current of the electric drive system according to the maximum output current of the charging pile, the maximum charging current of the battery pack and the maximum allowed charging current of the electric drive. Therefore, the problems that the electric drive system with the direct-current boost function cannot exert the actual charging capacity of the electric drive system because the maximum current allowed for direct-current boost charging is different under different boost ratios, 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, in particular to a maximum charging current evaluation method and device of an electric drive system, a vehicle and a medium. BACKGROUND

[0002] Currently, the penetration rate of electric vehicles is rapidly increasing, while charging time and range are still two major problems that restrict the development of current electric vehicles. High range requires high-capacity automotive batteries, so high-voltage batteries have become the industry development trend, but may affect the charging rate. Due to the variety of charging piles in the current market, the construction and iteration of charging piles generally lag behind the development of power battery technology, and many charging piles have lower voltage than power batteries, so electric vehicles generally carry a direct current boost system. Early on, a separate DC / DC (Direct Current) bridge circuit was usually used, and in recent years, due to technological progress, a direct current boost technology with more excellent cost has appeared by reusing the electric drive system.

[0003] In related technologies, when the electric drive system with direct current boost function is used to charge the battery, the constant power charging that meets the use requirements is usually used based on the temperature rise of the electric drive system within the battery charging time from 0 to 100% SOC (State of Charge). At high SOC, the battery charging current is usually used as the boundary because the battery charging capacity is low.

[0004] However, because the maximum current allowed for direct current boost charging of the electric drive system is different under different boost ratios, the above charging strategy does not fully utilize the actual charging capacity of the electric drive system, resulting in a long charging time. Therefore, when the electric drive system direct current boost is used to charge the battery, in addition to considering the battery charging strategy, the allowed direct current boost charging capacity of the electric drive system also needs to be considered, so the battery charging strategy in the above solution is not applicable.

[0005] In related technologies, such as patent CN114899911A, the current flows out of the motor system into the motor controller system, the current is boosted by the motor controller system, the boosted current enters the battery for charging, and the current flows out of the battery back to the charging pile to realize a closed loop.

[0006] However, the technical solution of the above patent does not involve the maximum allowed output current of the electric drive system under different boost conditions, so it cannot realize the evaluation method of the maximum charging current of the electric drive to improve the charging efficiency, which needs to be solved urgently. SUMMARY

[0007] The application provides a maximum charging current evaluation method, device, vehicle and medium of an electric drive system, to solve the problems in the related art that the electric drive system with a direct current boosting function cannot exert the actual charging capacity of the electric drive system because the maximum current allowed for direct current boosting charging is not considered under different boosting ratios, the charging time is shortened, and the charging efficiency is greatly improved.

[0008] The first aspect of the application provides a maximum charging current evaluation method of an electric drive system, comprising the following steps:

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

[0010] calculating a current boosting ratio according to the maximum output voltage and the bus voltage, obtaining the maximum allowed charging current of a power module by querying a preset first mapping table according to the maximum output voltage, and obtaining the maximum allowed charging current of a motor by querying a preset second mapping table according to the maximum output voltage and the current boosting ratio; and

[0011] obtaining the maximum allowed charging current of the electric drive system according to the maximum allowed charging current of the power module and the maximum allowed charging current of the motor, obtaining the direct current boosting target charging current of the electric drive system according to the maximum output current, the maximum charging current and the maximum allowed charging current of the electric drive system, and taking the direct current boosting target charging current of the electric drive system as the evaluation result of the maximum charging current.

[0012] According to the above technical means, because the boosting ratio is calculated according to 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 allowed charging current of the electric drive system are taken as the minimum value to obtain the direct current boosting target charging current of the electric drive system. Therefore, the application considers the maximum current allowed for direct current boosting charging of the electric drive system under different boosting ratios, thereby improving the charging capacity when the electric drive system is used for direct current boosting to charge the power battery, shortening the charging time and greatly improving the charging efficiency.

[0013] Optionally, in some embodiments, after obtaining the direct current boosting target charging current of the electric drive system, the method further comprises: detecting the current output voltage of the charging pile; if the current output voltage is the maximum output voltage, adjusting the current boosting ratio and controlling the output current of the electric drive system to be the direct current boosting target charging current of the electric drive system.

[0014] According to the technical means, when the charging pile voltage rises to the maximum output voltage, the boost ratio is adjusted, so that the output current of the electric drive system is the direct current boost target charging current of the electric drive system, thereby matching the size of the output current of the electric drive system with the allowed direct current boost charging capacity.

[0015] Optionally, in some embodiments, after adjusting the current boost ratio to control the output current of the electric drive system to be the direct current boost target charging current of the electric drive system, further comprising: judging whether the bus voltage is greater than or equal to the maximum charging voltage, or whether a direct current boost unavailable flag bit is received, or whether a direct current boost request signal is lost; if the bus voltage is greater than or equal to the maximum charging voltage, or the direct current boost unavailable flag bit is received, or the direct current boost request signal is lost, adjusting the current boost ratio to adjust the output current of the electric drive system to a preset value according to a preset gradient.

[0016] According to the technical means, by comparing the bus voltage and the maximum allowed charging voltage of the battery, it is judged whether the direct current boost request of the battery controller appears a shutdown flag bit or the request signal is lost, so that in the case that 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 the failure of the electric drive system caused by 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, further comprising: judging whether the electric drive system is in a preset fault state; if the electric drive system is not in the preset fault state, feeding back the direct current boost available flag bit, otherwise, feeding back the direct current boost unavailable flag bit.

[0018] According to the technical means, before evaluating the maximum current of the electric drive system, it is judged whether the current electric drive system is in an over-temperature or other fault state, if the current electric drive system is faulty, the direct current boost flag bit is not allowed and is fed back to the corresponding controller, so that the application can prevent the system from direct current boost charging and give feedback in the case that the electric drive system cannot work normally, so as to repair the fault in time and protect the electric drive system of the vehicle.

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

[0020] According to the technical means, the input voltage, the first mapping table of the maximum current allowed by the power module, and the second mapping table of the maximum allowed charging current under different input voltages and boost ratios are obtained through the power module black module test. Thus, the first mapping table and the second mapping table are used to fully consider the DC boost target charging current of the electric drive system under different input voltages and boost ratios, and the actual charging capacity of the electric drive system is exerted.

[0021] Optionally, in some embodiments, the maximum allowed charging current of the electric drive system is obtained according to the maximum allowed charging current of the power module and the maximum allowed charging current of the motor, including: taking the smaller one of the maximum allowed charging current of the power module and the maximum allowed charging current of the motor as the maximum allowed charging current of the electric drive system.

[0022] According to the technical means, the smaller one of the maximum allowed charging current of the power module and the maximum allowed charging current of the motor is obtained, so that the reasonable allowed charging current of the electric drive DC boost is obtained.

[0023] Optionally, in some embodiments, the electric drive system DC boost target charging current is obtained according to the maximum output current, the maximum charging current, and the maximum allowed charging current of the electric drive system, including: obtaining the smaller current value of the maximum output current and the maximum allowed charging current of the electric drive system; obtaining a 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, taking the maximum charging current as the electric drive system DC boost target charging current, otherwise, taking the smaller current value as the electric drive system DC boost target charging current.

[0024] According to the technical means, the smaller current value of the maximum output current and the maximum allowed charging current of the electric drive system is obtained, and the value is converted to power, so as to be compared with the maximum charging current of the battery, thereby obtaining the reasonable electric drive DC boost target charging current.

[0025] The second aspect embodiment of the present application provides an electric drive system maximum charging current evaluation device, including:

[0026] The acquisition module is configured to acquire the maximum output voltage and the maximum output current of the charging pile, the maximum charging voltage and the maximum charging current of the vehicle battery pack, and the bus voltage.

[0027] The mapping module is 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 allowed 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 allowed charging current of the motor.

[0028] The evaluation module is configured to obtain a maximum allowed charging current of the electric drive system according to the maximum allowed charging current of the power module and the maximum allowed charging current of the motor, obtain a direct-current boost target charging current of the electric drive system according to the maximum output current, the maximum allowed charging current and the maximum allowed charging current of the electric drive system, and take the direct-current boost target charging current of the electric drive system as a maximum charging current evaluation result.

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

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

[0031] Optionally, in some embodiments, before obtaining the maximum output voltage and the maximum output current of the charging pile, the acquisition module further comprises: a determination unit configured to determine whether the electric drive system is in a preset fault state; and a feedback unit configured to feed back the direct-current boost available flag bit when the electric drive system is not in the preset fault state, and otherwise, feed back the direct-current boost unavailable flag bit.

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

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

[0034] Optionally, in some embodiments, the evaluation module further comprises an acquisition unit configured to acquire a smaller current value from the maximum output current and the maximum allowed charging current of the electric drive system; a comparison unit configured to obtain a target current value according to a ratio of a power value corresponding to the smaller current value to the maximum charging voltage, and take the maximum charging current as the direct-current boosting target charging current of the electric drive system when the target current value is greater than the maximum charging current, otherwise, take the smaller current value as the direct-current boosting target charging current of the electric drive system.

[0035] The 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 of the electric drive system as described in the above embodiments.

[0036] The fourth aspect of the present application provides a computer readable storage medium, which stores a computer program executable by a processor to implement the maximum charging current evaluation method of the electric drive system as described above.

[0037] The beneficial effects of the present application are as follows:

[0038] (1) The present application can improve the charging capacity when the direct-current boosting of the electric drive system is used to charge the power battery, shorten the charging time, and greatly improve the charging efficiency;

[0039] (2) The present application fully considers the boosting ratio of the electric drive system, provides a maximum charging current evaluation method of the electric drive system, and fully develops the actual charging capacity of the electric drive system;

[0040] (3) The present application provides a battery charging strategy based on the direct-current boosting charging function, which guarantees the actual charging capacity of the electric drive system while detecting whether the electric drive power module temperature, the motor stator temperature, and the direct-current boosting request flag signal meet the operating conditions, thereby avoiding the failure of the electric drive system and protecting the system safety.

[0041] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings of which:

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

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

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

[0047] Figure 5 A schematic diagram of a certain 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 according to an embodiment of the present application;

[0049] Figure 7 A schematic diagram of a vehicle according to an embodiment of the present application.

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

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

[0052] The maximum charging current evaluation method, device, vehicle and medium of the electric drive system of the embodiment of the present application are described below with reference to the accompanying drawings. In view of the problems of the electric drive system with DC boost function in the related art mentioned in the background, which fails to exert the actual charging capacity of the electric drive system due to the failure to consider that the maximum current allowed for DC boost charging is different at different boost ratios, the present application provides a maximum charging current evaluation method of an electric drive system. The maximum output voltage and maximum output current of a charging pile, the maximum charging voltage and maximum charging current of a vehicle battery pack, and the bus voltage are obtained. The current boost ratio is calculated according to the maximum output voltage and the bus voltage, and the maximum allowed charging current of a power module is obtained by querying a preset first mapping table according to the maximum output voltage. The maximum allowed charging current of a motor is obtained by querying a preset second mapping table according to the maximum output voltage and the current boost ratio. The maximum allowed charging current of the electric drive system is obtained according to the maximum allowed charging current of the power module and the maximum allowed charging current of the motor. 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 allowed charging current of the electric drive system, and the DC boost target charging current of the electric drive system is taken as the evaluation result of the maximum charging current. Thus, the problems of the electric drive system with DC boost function in the related art, which fails to exert the actual charging capacity of the electric drive system due to the failure to consider that the maximum current allowed for DC boost charging is different at different boost ratios, are solved, the charging time is shortened, and the charging efficiency is improved.

[0053] Specifically, Figure 1 A flowchart of the maximum charging current evaluation method of the electric drive system provided by the embodiment of the present application is shown in FIG. 1.

[0054] As Figure 1 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 a charging pile, the maximum charging voltage and maximum charging current of a vehicle battery pack, and the bus voltage are obtained.

[0056] It should be noted that Figure 2 A schematic diagram of the electric drive charging system with DC boost function and signal transmission of the embodiment of the present application is shown in FIG. 2. As Figure 2 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 each part of the system are transmitted through a charging pile controller, a motor controller and a battery controller.

[0057] Specifically, as Figure 2As shown, when the charging of the vehicle is connected with the charging pile, the battery controller determines the maximum output voltage and the 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 the maximum charging current of the power battery (vehicle battery pack) and the bus voltage through CAN (Controller Area Network) communication.

[0058] Optionally, in some embodiments, before acquiring the maximum output voltage and the maximum output current of the charging pile, the method further comprises: determining whether the electric drive system is in a preset fault state; if the electric drive system is not in the preset fault state, feeding back a direct-current boost available flag, otherwise, feeding back a direct-current boost unavailable flag.

[0059] In the embodiments of the present application, the preset fault state of the electric drive system can be an electric drive over-temperature and the like affecting 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 a normal working state, before acquiring the maximum output voltage and the maximum output current of the charging pile, the present application needs to detect whether the electric drive system is in a fault state, and in the case that each index of the electric drive system is normal, a signal that the direct-current boost function can be performed is fed back, otherwise, a direct-current boost unavailable flag and an electric drive fault code are fed back.

[0061] Specifically, the motor controller feeds back an electric drive direct-current boost function available flag and starts a cooling strategy or a pump control mode (the strategy is selected according to the electric drive cooling mode) in the electric drive direct-current boost function mode, according to the current motor power module temperature and the motor stator temperature not exceeding the temperature alarm threshold and no fault of itself.

[0062] Therefore, the electric drive system can successfully charge, and the faulty electric drive can be checked and repaired in time, thereby improving the safety of the whole vehicle system.

[0063] Further, the battery controller receives the electric drive controller direct-current boost available flag, thereby starting the electric drive system direct-current boost function to charge the battery pack, sends a charging pile output voltage request, requests the output voltage to be fixed as voltage U0, U0 is the highest voltage at which the charging pile can stably output peak power, and sends the signal to the motor controller through CAN communication.

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

[0065] Wherein, the current boost ratio of the embodiment of the application is obtained by calculation according to the maximum output voltage and the bus voltage, and the calculation formula is:

[0066]

[0067] Wherein, a is the boost ratio, U0 is the highest voltage of the charging pile that can stably output the peak power, 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 application, the following embodiments will specifically illustrate the mapping table involved in the application.

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

[0070] It can be understood that when the electric drive system is directly boosted for charging, the maximum charging current mainly depends on the temperature rise of the electric drive, which is affected by the temperature of the power module, the motor stator and the motor rotor. Since a specific cooling strategy is generally adopted when the electric drive is directly boosted, based on the principle of thermodynamics, the temperature rise of the electric drive is mainly related to the loss of each electronic component at this time. The loss of the electric drive system includes switch loss, conduction loss of the power module, copper loss of the motor stator, iron loss, rotor iron loss, and mechanical loss of bearings, gears and the like.

[0071] When the electric drive system is directly boosted, it can be equivalent to a boost boost chopper circuit, and the electric drive does not rotate, so 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 of the electric drive system loss and the formula of the loss of the main electrical components and the ripple current based on the boost equivalent circuit can be referred 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 switch loss under direct current boost, f p is a function representing the switch loss, f s is the switching frequency, I Rms is the load current, and V in is the direct current boost input current.

[0074] When boost is directly boosted, 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 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 is related, when the motor scheme and the switching frequency are constant, it can be regarded as a constant, and α is the boost ratio.

[0077] The calculation formula of the stator copper loss is represented 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 effective value of single-phase current, R i is the single-phase resistance, when the motor scheme is constant, the copper loss and the allowable charging current are positively correlated.

[0080] The 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 the coefficient in [1.5, 2.5], B max is the maximum magnetic flux density related to the ripple current amplitude, k Fe,n is the correction coefficient, P 10 represents the loss value of unit volume material at 1, 50 Hz (about 1.75 W / kg), B n is the magnetic flux density amplitude, m Fe,n is the mass of each part of the material, when the motor scheme is determined, η, k, k Fe,n , P 10 , m Fe,n can be regarded as constants, B max and are related to the size of the ripple current.

[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 a 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 a is the boost ratio.

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

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

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

[0089] Table 1

[0090]

[0091] Table 2

[0092]

[0093] Based on the above embodiment, the present application obtains the first mapping table and the second mapping table, fits the minimum envelope of the first mapping table and the second mapping table, and obtains the preset table of the maximum allowed charging current of the electric drive DC boost under different input voltages-boost ratios as shown in Table 3.

[0094] Table 3

[0095]

[0096] In addition, it should be noted that Tables 1, 2, and 3 in this embodiment are merely illustrative and are not specifically limited herein. The data in each cell in the table can be obtained by those skilled in the art through limited experiments or the like according to actual conditions.

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

[0098] In step S103, 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.

[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 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 of the power module I 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 is selected).

[0101] Optionally, in some embodiments, 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 allowed charging current of the electric drive system, comprising: obtaining a smaller current value from the maximum output current and the maximum allowed charging current of the electric drive system; obtaining a target current value according to the ratio of the power value corresponding to the smaller current value to the maximum charging voltage, and taking the maximum charging current as the DC boost target charging current of the electric drive system when the target current value is greater than the maximum charging current, otherwise, taking 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 allowed charging current of the electric drive system are input currents, while the maximum charging current of the battery is an output current, so the three cannot be directly compared. Therefore, the smaller current value is obtained by obtaining the maximum output current and the maximum allowed charging current of the electric drive system, and the value is power converted 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-boosting ratio table (Table 2), the maximum allowed charging current I D_max of the electric drive is generated. Pile_max The maximum output current I D_max of the charging pile and the maximum allowed charging current I tar of the electric drive system are compared. Bat_max The smaller current value is obtained, and the target current value I tar is the ratio of the power value corresponding to the smaller current value to the maximum charging voltage U Tar_charge . tar Then, the target current value I Bat_max is compared with the maximum charging current, that is, according to the formula I Tar_charge = min[I tar ,I Bat_max ], the DC boost target charging current I Tar_charge of the electric drive is finally obtained.

[0104] Optionally, in some embodiments, after obtaining the DC boost target charging current of the electric drive system, it further comprises: 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 DC boost target charging current of the electric drive system, it is necessary to detect whether the voltage of the DC boost input end 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 a to control the output current of the electric drive system to be the DC boost target charging current I Tar_charge of the electric drive system.

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

[0107] In the embodiment of the application, the preset value of the electric drive system output current is 0.

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

[0109] In order for a person skilled in the art to further understand the maximum charging current evaluation method of the electric drive with a DC boost function of the application, the following exemplary embodiments will illustrate the steps of the method.

[0110] Specifically, Figure 3 For the schematic diagram of the maximum charging current evaluation method of the electric drive with a DC boost function of the embodiment of the application, as Figure 3 shown, the specific process of the method is as follows:

[0111] Step S301, the motor controller reads the highest voltage U0 of the peak stable output power of the charging pile, the maximum output current I Pile_max , the bus voltage U dc , the bus current I dc , the maximum charging current I Bat_max , the maximum charging voltage U Bat_max , the power module temperature T pow , and the motor temperature T mot through CAN communication.

[0112] Step S302, the motor controller calculates the boost ratio a = U0 / (U dc + 10) according to the highest voltage U0 of the peak stable output power of the charging pile and the bus voltage U dc .

[0113] Step S303, querying the first mapping table with U0 as the input voltage to obtain the maximum allowed charging current I of the power module pow_max ;

[0114] Step S304, querying the second mapping table with U0 as the input voltage to obtain the maximum allowed charging current I of the motor mot_max ;

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

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

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

[0118] Therefore, the evaluation method for the maximum charging current of the electric drive with the DC boost charging function provided by the application considers the maximum current allowed for DC boost charging of the electric drive system under different boost ratios, thereby fully exerting the actual charging capacity of the electric drive system.

[0119] Based on the above embodiment, the application further provides a battery charging strategy for the maximum charging current of the electric drive with the DC boost charging function. The steps of the strategy will be specifically described below with reference to the accompanying drawings.

[0120] In this embodiment, the battery controller obtains the maximum charging voltage of the charging pile through information interaction in the charging handshake process, thereby determining whether DC boost is needed, sending a DC boost start request signal flag to the motor controller, and starting the electric drive DC boost function. Specifically, Figure 4 is a flowchart of the battery charging strategy for the electric drive with the DC boost function according to the embodiment of the application, as shown in the figure, the charging strategy of the electric drive system includes the following steps: Figure 4

[0121] Step S401, the battery controller DC boost request start flag​

[0122] In step S402, the motor controller detects whether the electric drive has a fault such as over-temperature affecting the operation of the electric drive. If there is no fault, step S403 is executed. If the electric drive has a fault, step S404 is executed.

[0123] In step S403, the DC boost function is started, and a DC boost available flag is fed back, and then step S405 is executed.

[0124] In step S404, the DC boost flag is not allowed, a fault code is fed back, and the flow ends.

[0125] In step S405, a DC boost cooling strategy is executed.

[0126] In step S406, the peak power, the highest voltage, and the current that can be stably output by the charging pile, the battery pack bus voltage, and the maximum charging voltage allowed by the battery pack are read.

[0127] In step S407, the charging pile request voltage is sent, and the boost ratio is calculated.

[0128] In step S408, a preset electric drive allowed charging current table is queried to obtain the electric drive allowed charging current.

[0129] In step S409, a target current value (the ratio of the smaller current value between the maximum output current and the maximum allowed current of the electric drive system to the maximum charging voltage) is obtained, which is compared with the maximum charging current, and the smaller one is obtained as the target charging current.

[0130] In step S410, it is detected that the charging pile output voltage rises to the target voltage U0.

[0131] In step S411, the duty cycle of the electric drive controller is adjusted to control the output charging current to be the target current.

[0132] In step S412, the bus voltage is greater than or equal to the highest allowed charging voltage of the battery, or the DC boost request off flag of the battery controller is set, or the request signal is lost.

[0133] In step S413, the duty cycle is adjusted so that the charging current decreases to 0 at a certain gradient.

[0134] Therefore, based on the above-mentioned maximum charging current evaluation method of the electric drive with the DC boost charging function, when the electric drive system DC boost charges the battery, the allowed DC boost charging capability of the electric drive system is considered in addition to the charging strategy of the battery itself, which greatly improves the charging efficiency.

[0135] Based on the above-mentioned embodiment, the maximum charging current evaluation method of the electric drive system is used to test the vehicle using the electric drive system DC boost to charge the battery, and the following results are obtainedFigure 5 The working condition schematic diagram of a certain battery DC boost charging test is shown, Figure 5 The broken line-a is a DC boost output voltage, the broken line-b is a charging current, and the broken line-c is a charging power.

[0136] According to the maximum charging current evaluation method of the electric drive system provided in the embodiment of the 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 allowed charging current of the power module is obtained by querying the first mapping table according to the maximum output voltage, the maximum allowed 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 allowed charging current of the electric drive is obtained by taking the smaller one of the maximum allowed charging current of the power module and the maximum allowed charging current of the motor, the target current value is obtained according to the maximum output current of the charging pile and the maximum allowed charging current of the electric drive, and the DC boost target charging current of the electric drive system is obtained by taking the smaller one of the target current value and the maximum charging current of the battery pack. Therefore, the problems that the electric drive system with the DC boost function cannot exert the actual charging capacity of the electric drive system because the maximum current allowed for DC boost charging is not considered under different boost ratios, the charging time is shortened, and the charging efficiency is improved.

[0137] Secondly, the maximum charging current evaluation device of the electric drive system provided in the embodiment of the application is described with reference to the accompanying drawings.

[0138] Figure 6 The block schematic diagram of the maximum charging current evaluation device of the electric drive system in the embodiment of the application is shown.

[0139] As Figure 6 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] The acquisition module 100 is configured to acquire the maximum output voltage and the maximum output current of the charging pile, the maximum charging voltage and the maximum charging current of the vehicle battery pack, and the bus voltage. The mapping module 200 is configured to calculate the current boost ratio according to the maximum output voltage and the bus voltage, obtain the maximum allowed charging current of the power module by querying the preset first mapping table according to the maximum output voltage, and obtain the maximum allowed charging current of the motor by querying the preset second mapping table according to the maximum output voltage and the current boost ratio. The evaluation module 300 is configured to obtain the maximum allowed charging current of the electric drive system according to the maximum allowed charging current of the power module and the maximum allowed charging current of the motor, 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 allowed charging current of the electric drive system, and take 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 comprises a detection unit and a control unit.

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

[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 further configured to determine whether the bus voltage is greater than or equal to the maximum charging voltage, whether a DC boost unavailable flag bit is received, or whether a DC boost request signal is lost, and adjust the current boost ratio and adjust the output current of the electric drive system to a preset value according to a preset gradient when the bus voltage is greater than or equal to the maximum charging voltage, the DC boost unavailable flag bit is received, or the DC boost request signal is lost.

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

[0145] The determination unit is configured to determine whether the electric drive system is in a preset fault state, and the feedback unit is configured to feed back a DC boost available flag bit when the electric drive system is not in the preset fault state, and otherwise, feed back a DC boost unavailable flag bit.

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

[0147] Optionally, in some embodiments, the evaluation module 300 further comprises a minimum taking unit.

[0148] The minimum taking unit is configured to take the smaller one of the maximum allowed charging current of the power module and the maximum allowed charging current of the motor as the maximum allowed charging current of the electric drive system.

[0149] Optionally, in some embodiments, the evaluation module 300 further comprises 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 aforementioned explanation of the embodiment of the method for evaluating the maximum charging current of an electric drive system is also applicable to the device for evaluating the maximum charging current of an electric drive system of this embodiment, and will not be repeated here.

[0152] According to the maximum charging current evaluation device for the electric drive system proposed in the embodiment of the present application, the boost ratio is calculated based on 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 based on the maximum output voltage, the maximum allowable charging current of the motor is obtained by querying the second mapping table based on 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 based on the maximum output current of the charging pile and the maximum allowable charging current of the electric drive, and the DC boost target charging current of the electric drive system is obtained by taking the smaller one of the target current value and the maximum charging current of the battery pack. 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] Memory 701 , processor 702 , and computer programs 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 further comprises:

[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 run on the processor 702 .

[0159] The memory 701 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, 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 complete communication between 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, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 7 In the figure, only one thick line is used to represent the bus, but it 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 complete communication between each other through an internal interface.

[0162] The processor 702 can 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] The embodiment also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the maximum charging current evaluation method of the electric drive system as above.

[0164] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, the usage of "N" means at least two, for example, two, three or the like, unless explicitly stated otherwise.

[0165] Furthermore, the terms "first", "second", or the like, are used merely as a designation of certain elements or features, and do not imply or connote relative importance or a specific order of categorization of the indicated features. Accordingly, features described as "first" or "second" can be explicitly or implicitly included in at least one of the features. In the description of the application, the term "N" means at least two, for example, two, three, etc., unless explicitly stated otherwise.

[0166] Any process or method descriptions or blocks in flow charts or otherwise described herein represent embodiments which can be managed as one or more modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions or steps, and alternate implementations are possible. In some embodiments, the processes and methods described can be executed by one or more apparatuses or devices, either locally or remotely, and can communicate via any suitable data connection or link, either hardwired, wireless, or any combination of these. The processes and methods described can also be embodied in a computer readable medium containing executable code, which can be executed by one or more processors or processing units.

[0167] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the 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 (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or N wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc 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 can be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing it in other suitable ways as necessary, and then storing it in a computer memory.

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

[0169] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0170] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0171] The storage medium mentioned above can 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 should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to 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 Obtaining 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 obtaining 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 using the DC boost target charging current of the electric drive system as a maximum charging current evaluation result; 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 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; 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; A 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.

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 and the output current of the electric drive system is adjusted to a preset value according to a preset gradient.

4. The method according to claim 1, wherein 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, wherein 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. 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 step-up ratio based on the maximum output voltage and the bus voltage, query a preset first mapping table based on the maximum output voltage to obtain a maximum allowable charging current for the power module, and query a preset second mapping table based on the maximum output voltage and the current step-up ratio to obtain a maximum allowable charging current for the motor; as well as an evaluation module, configured 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, 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 use the DC boost target charging current of the electric drive system as a maximum charging current evaluation result; 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 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; 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; A 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.

7. 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 according to any one of claims 1 to 5.

8. 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 for an electric drive system according to any one of claims 1 to 5.

Images