High-voltage power-on control method and device for electric vehicle

Abstract

The application relates to the technical field of high-voltage power-on of vehicles, and provides a high-voltage power-on control method and device for an electric vehicle. The method comprises the following steps: during a pre-charging process of a bus capacitor of the electric vehicle, determining that a bus voltage of the electric vehicle reaches a preset voltage, controlling an inverter of the electric vehicle to switch to a first operation mode, so that a motor winding connected with the inverter receives bus current to store energy; determining that a stored energy value of the motor winding reaches a preset threshold value, controlling the inverter to switch to a second operation mode, so that the motor winding releases the stored energy to the bus capacitor until it is detected that the bus voltage matches a battery voltage of a battery pack of the electric vehicle, and the electric vehicle is controlled to be powered on. The high-voltage power-on control method for the electric vehicle provided by the application can shorten the time required for high-voltage power-on of the electric vehicle and improve the high-voltage power-on efficiency of the electric vehicle.

Description

Technical Field

[0001] This application relates to the field of high-voltage power supply technology for vehicles, specifically to a high-voltage power supply control method and device for electric vehicles. Background Technology

[0002] Electric vehicles typically carry a large number of high-voltage loads, which need to be powered on when the electric vehicle starts and runs.

[0003] Since the DC input terminals of high-voltage loads in electric vehicles typically have large-capacity capacitors, and these capacitors are at zero voltage before the motor closes the main relay, related technologies require pre-charging of the bus capacitors before the motor closes the main relay. Specifically, this involves closing the pre-charge relay and using a pre-charge resistor to limit the current and charge the capacitors on the bus until the capacitor voltage approaches the series voltage of the cells inside the battery pack. Only then is the main relay closed to control the electric vehicle to receive high-voltage power, thus avoiding large inrush currents that could damage the main relay or other power devices.

[0004] However, since the charging current through the pre-charging resistor is proportional to the voltage difference between the battery and the bus, the voltage difference between the battery pack and the bus decreases in the later stages of the pre-charging process. At this time, the charging current through the pre-charging resistor also decreases, resulting in a longer charging time. This leads to an increase in the time required for the electric vehicle to be powered on at high voltage, thus affecting the high voltage power-on efficiency of the electric vehicle. Summary of the Invention

[0005] This application aims to at least solve one of the technical problems existing in the related art. To this end, this application proposes a high-voltage power-on control method for electric vehicles, which can shorten the time required for high-voltage power-on of electric vehicles and improve the high-voltage power-on efficiency of electric vehicles.

[0006] A high-voltage power-on control method for an electric vehicle according to an embodiment of the first aspect of this application includes: During the pre-charging process of the bus capacitor of the electric vehicle, it is determined that the bus voltage of the electric vehicle reaches the preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. Once the stored energy value of the motor winding is determined to reach a preset threshold, the inverter is controlled to switch to the second operating mode so that the motor winding releases stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and the electric vehicle is controlled to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage.

[0007] During the pre-charging process of the electric vehicle's bus capacitor, if the bus voltage of the electric vehicle is detected to reach a preset voltage, the inverter of the electric vehicle is controlled to switch to the first operating mode. This allows the motor windings connected to the inverter to receive bus current and store energy. When the stored energy value of the motor windings reaches a preset threshold, the inverter is controlled to switch to the second operating mode, allowing the motor windings to release the stored energy to the bus capacitor. This continues until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, at which point the electric vehicle is controlled to perform high-voltage power-on. Since the energy storage in the motor windings is not affected by the voltage difference between the battery pack and the bus, the energy storage and release by the motor windings after the bus voltage reaches the preset voltage allows the stored energy in the motor windings to quickly raise the bus voltage in the later stages of pre-charging, enabling the electric vehicle to meet the high-voltage power-on requirements. This shortens the time required for high-voltage power-on and improves the high-voltage power-on efficiency of the electric vehicle.

[0008] According to one embodiment of this application, during the pre-charging process of the bus capacitor in an electric vehicle, if the bus voltage of the electric vehicle reaches a preset voltage, the inverter of the electric vehicle is controlled to switch to a first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage, including: During the pre-charging process of the bus capacitor in the electric vehicle, the duration of the pre-charging is detected. When the duration reaches a preset duration, it is determined that the bus voltage of the electric vehicle reaches a preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The preset duration is determined based on the preset voltage.

[0009] According to one embodiment of this application, the preset duration is: ; in, This indicates the preset duration. This indicates the resistance value of the pre-charging resistor during the pre-charging process. This refers to the capacitor of the inverter. This indicates the preset voltage. This indicates the battery voltage.

[0010] According to one embodiment of this application, controlling the inverter of the electric vehicle to switch to a first operating mode, so that the motor windings connected to the inverter receive bus current for energy storage, includes: Based on space vector modulation, the inverter of the electric vehicle is controlled to switch to the first operating mode, and a voltage vector consistent with the direction of the rotor permanent magnet magnetic field is applied to the motor winding, so that the motor winding connected to the inverter receives the bus current for energy storage.

[0011] According to one embodiment of this application, determining that the stored energy value of the motor winding reaches a preset threshold and controlling the inverter to switch to a second operating mode includes: When the energy storage time of the motor winding reaches the target time, it is determined that the stored energy value of the motor winding has reached a preset threshold, and the inverter is controlled to switch to the second operating mode. The target duration is determined based on the preset threshold.

[0012] According to one embodiment of this application, the target duration is: ; in, Indicates the target duration. This refers to the preset threshold.

[0013] According to one embodiment of this application, detecting that the bus voltage matches the battery voltage of the electric vehicle's battery pack and controlling the electric vehicle to apply high-voltage power includes: If the bus voltage is detected to be consistent with the battery voltage, the electric vehicle is controlled to receive high-voltage power.

[0014] According to one embodiment of this application, it also includes: If the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, the inverter is controlled to stop operating.

[0015] A high-voltage power-on control device for an electric vehicle according to a second aspect embodiment of this application includes: The energy storage control module is used to determine that the bus voltage of the electric vehicle reaches a preset voltage during the pre-charging process of the bus capacitor of the electric vehicle, and control the inverter of the electric vehicle to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The high-voltage power-on module is used to determine that the stored energy value of the motor winding reaches a preset threshold, control the inverter to switch to the second operating mode so that the motor winding releases the stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and control the electric vehicle to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage.

[0016] An electronic device according to a third aspect of this application includes a processor and a memory storing a computer program, wherein the processor executes the computer program to implement the high-voltage power-on control method for an electric vehicle as described in any of the above embodiments.

[0017] A computer-readable storage medium according to a fourth aspect of this application stores a computer program thereon, which, when executed by a processor, implements the high-voltage power-on control method for an electric vehicle as described in any of the above embodiments.

[0018] An electric vehicle according to a fifth aspect of this application includes electronic equipment as described in a third aspect embodiment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a high-voltage network for an electric vehicle provided in an embodiment of this application; Figure 2 A first flowchart illustrating the high-voltage power-on control method for an electric vehicle provided in an embodiment of this application; Figure 3 A schematic diagram of the second process of the high-voltage power-on control method for electric vehicles provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the high-voltage power-on control device for an electric vehicle provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The high-voltage power-on control method and device for electric vehicles provided in this application will be described in detail below through several specific embodiments.

[0023] Electric vehicles typically carry a large number of high-voltage loads, such as the vehicle's core powertrain and thermal management system. When an electric vehicle starts up and runs, these high-voltage loads need to be powered on.

[0024] Since the DC input terminals of high-voltage loads in electric vehicles typically have large-capacity capacitors, and these capacitors are at zero voltage before the motor closes the main relay, related technologies require pre-charging of the bus capacitors before the motor closes the main relay. Specifically, this involves closing the pre-charge relay and using a pre-charge resistor to limit the current and charge the capacitors on the bus until the capacitor voltage approaches the series voltage of the cells inside the battery pack. Only then is the main relay closed to control the electric vehicle to receive high-voltage power, thus avoiding large inrush currents that could damage the main relay or other power devices.

[0025] However, since the charging current through the pre-charging resistor is proportional to the voltage difference between the battery and the bus, the voltage difference between the battery pack and the bus is large in the early stages of the pre-charging process, resulting in a large charging current and a rapid rise in the bus voltage. But in the later stages of the pre-charging process, the voltage difference between the battery pack and the bus decreases, and the charging current through the pre-charging resistor also decreases, leading to a slower rise in the bus voltage. This results in a longer charging time, increasing the time required for high-voltage power-on of the electric vehicle and affecting its high-voltage power-on efficiency.

[0026] To address the aforementioned technical problems, this application embodiment addresses the issue by, during the pre-charging process of the electric vehicle's bus capacitor, if the bus voltage of the electric vehicle is detected to reach a preset voltage, controlling the electric vehicle's inverter to switch to a first operating mode. This allows the motor windings connected to the inverter to receive bus current and store energy. When the stored energy value of the motor windings reaches a preset threshold, the inverter switches to a second operating mode, allowing the motor windings to release the stored energy to the bus capacitor. This continues until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, at which point the electric vehicle is controlled to perform high-voltage power-on. Since the energy storage in the motor windings is not affected by the voltage difference between the battery pack and the bus, the energy storage and release via the motor windings after the bus voltage reaches the preset voltage allows for rapid increase in the bus voltage during the later stages of pre-charging, enabling the electric vehicle to meet the high-voltage power-on requirements. This shortens the time required for high-voltage power-on and improves the efficiency of high-voltage power-on for the electric vehicle.

[0027] According to some embodiments of this application, such as Figure 2 As shown, a high-voltage network for an electric vehicle is provided, including a battery pack 10, a main relay K1, a pre-charge relay K2, and a pre-charge resistor R. chargeThe system includes an inverter 20, a motor winding 30, a control unit 40, and a high-voltage load 50. The inverter 20 and high-voltage load 50 are connected to the main relay K1 and the pre-charge relay K2 via a bus to the battery pack 10. The control unit 40 controls the operating mode of the inverter 20, allowing the motor winding to receive bus current for energy storage or release stored energy to the bus capacitor. The control unit 40 can also control the pre-charge relay K2 to close and the main relay K1 to open, via the pre-charge resistor R... charge The current is limited to charge the capacitor on the bus; or the pre-charge relay K2 is opened and the main relay K1 is closed to control the electric vehicle to be powered on at high voltage.

[0028] According to some embodiments of this application, this application provides a high-voltage power-on control method for electric vehicles. This method can be applied to the aforementioned control unit for high-voltage power-on control of the electric vehicle. The control unit may include a vehicle domain controller, VCU (Vehicle Control Unit), MCU (Microcontroller Unit), ECU (Electronic Control Unit), and / or other on-board electronic devices.

[0029] like Figure 2 As shown, this embodiment provides a high-voltage power-on control method for electric vehicles, including: S101, during the pre-charging process of the bus capacitor of the electric vehicle, it is determined that the bus voltage of the electric vehicle reaches the preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. S102, determine that the stored energy value of the motor winding reaches a preset threshold, control the inverter to switch to the second operating mode so that the motor winding releases stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and control the electric vehicle to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage.

[0030] In some embodiments, such as Figure 1 As shown, when a high-voltage power supply is required for the electric vehicle, the pre-charge relay K2 closes and the main relay K1 opens. At this time, the electric vehicle pre-charges the bus capacitor, that is, through the pre-charge resistor R... chargeThe capacitors on the bus are charged. The control unit can obtain the operating status of the main relay K1 and relay K2 in real time from the BMS (BATTERY MANAGEMENT SYSTEM). If the main relay K1 is open and the pre-charge relay K2 is closed, it indicates that the electric vehicle is in the pre-charging process. At this time, it enters the "bus voltage waiting" state, which monitors the bus voltage of the electric vehicle in real time and determines whether the bus voltage has reached the preset voltage U. dc,1 .

[0031] During the pre-charging process, the bus voltage changes over time as follows: ; in, This represents the bus voltage at time t; This indicates the battery voltage of battery pack 10, which is the total voltage of the cells connected in series within the battery pack. This indicates the capacitor in inverter 20.

[0032] If bus voltage is detected Reaching the preset voltage U dc,1 Then, the inverter 20 can be controlled to switch to the first operating mode. If switched to inverter mode, the motor winding 30 connected to the inverter 20 receives the bus current for energy storage, so that the bus voltage is maintained at the preset voltage U. dc,1 The energy of the bus capacitor remains constant. The energy from the battery enters the motor winding 30, and the energy stored in the motor winding gradually increases, that is:

[0033] in, This represents the total energy received by the motor windings at time t.

[0034] In some embodiments, the preset voltage may be based on the battery voltage. Confirmed. (For example, the preset voltage U...) dc,1 =0.5*U battery Since the power supply with internal resistance R receives the maximum power when the external load is exactly equal to R, the power received by the external load is maximized when the preset voltage U... dc,1 =0.5*U battery This allows the DC bus to draw maximum power from the battery pack, thus minimizing charging time.

[0035] After the inverter 20 is switched to the first operating mode, allowing the motor winding 30 to receive bus current for energy storage, it can be detected whether the stored energy value of the motor winding has reached a preset threshold. This preset threshold can be set according to actual conditions. To ensure that the energy stored in the motor winding 30 is released to the DC bus sufficiently to raise the voltage to the battery voltage (i.e., the total series voltage of the battery pack cells) and prevent damage to the main relay, a preset threshold is determined. for: .

[0036] If the stored energy value of the motor windings reaches a preset threshold, the control unit 40 can obtain the battery voltage of the battery pack from the BMS and control the inverter 20 to switch to the second operating mode, such as rectification mode, so that the energy stored in the motor windings 30 is released to the DC bus, and the bus voltage rises rapidly. At the same time, during the process of the motor windings 30 releasing energy to the DC bus, the voltage difference between the bus voltage and the battery voltage is continuously detected; if the voltage difference between the bus voltage and the battery voltage is less than the preset voltage difference, it can be determined that the bus voltage matches the battery voltage of the electric vehicle's battery pack. At this time, the main relay K1 is closed and the pre-charge relay K2 is opened, controlling the electric vehicle to perform high-voltage power-on to complete the high-voltage network power-on process.

[0037] During the pre-charging process of the electric vehicle's bus capacitor, if the bus voltage of the electric vehicle is detected to reach a preset voltage, the inverter of the electric vehicle is controlled to switch to the first operating mode. This allows the motor windings connected to the inverter to receive bus current and store energy. When the energy storage time of the motor windings reaches the target duration, the inverter is controlled to switch to the second operating mode, allowing the motor windings to release the stored energy to the bus capacitor. This continues until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, at which point the electric vehicle is controlled to perform high-voltage power-on. Since the energy storage in the motor windings is not affected by the voltage difference between the battery pack and the bus, the energy storage and release by the motor windings after the bus voltage reaches the preset voltage allows the energy stored in the motor windings to quickly raise the bus voltage in the later stages of pre-charging, enabling the electric vehicle to meet the high-voltage power-on requirements. This shortens the time required for high-voltage power-on of the electric vehicle and improves the high-voltage power-on efficiency.

[0038] In some embodiments, during the pre-charging process of the bus capacitor in an electric vehicle, if the bus voltage of the electric vehicle reaches a preset voltage, the inverter of the electric vehicle is controlled to switch to a first operating mode so that the motor windings connected to the inverter receive bus current for energy storage, including: During the pre-charging process of the bus capacitor in the electric vehicle, the duration of the pre-charging is detected. When the duration reaches a preset duration, it is determined that the bus voltage of the electric vehicle reaches a preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The preset duration is determined based on the preset voltage.

[0039] In some embodiments, the battery voltage U of the battery pack can be obtained from the BMS first. battery This refers to the total series voltage of the battery pack's cells. Based on the battery voltage U... battery The preset voltage can be determined as U. dc,1 =0.5*U battery .

[0040] During the pre-charging process, the bus voltage changes over time as follows: ; Therefore, it can be determined in advance through experiments that the bus voltage will rise to a preset voltage U during the pre-charging process. dc,1 The required duration is determined and set as the preset duration.

[0041] Alternatively, the rise of the bus voltage to the preset voltage U can be determined by examining the circuit characteristics of the electric vehicle's high-voltage network. dc,1 When, the required time for: .

[0042] Determine the duration Then, the duration can be set. The preset duration is set to ensure greater accuracy.

[0043] After determining the preset duration, the pre-charging process of the electric vehicle's bus capacitor can be timed to detect whether the pre-charging duration has reached the preset duration. If the pre-charging duration reaches the preset duration, it can be determined that the bus voltage has reached the preset voltage. At this point, the inverter is controlled to switch to the first operating mode, allowing the motor windings to receive bus current for energy storage. This timing-based triggering of the inverter switching to the first operating mode avoids false triggering due to bus voltage fluctuations, thus improving the reliability of high-voltage power-on control for electric vehicles.

[0044] To further improve the high-voltage power-on efficiency of electric vehicles, in some embodiments, the inverter of the electric vehicle is controlled to switch to a first operating mode, so that the motor windings connected to the inverter receive bus current for energy storage, including: Based on space vector modulation, the inverter of the electric vehicle is controlled to switch to the first operating mode, and a voltage vector consistent with the direction of the rotor permanent magnet magnetic field is applied to the motor winding, so that the motor winding connected to the inverter receives the bus current for energy storage.

[0045] In some embodiments, when the motor winding is that of a permanent magnet synchronous motor, if the bus voltage is detected to reach a preset voltage, the inverter can be controlled to switch to a first operating mode based on space vector modulation (SVPWM). For example, SVPWM can be used to adjust the duty cycle of each switch in the upper and lower bridge arms of the inverter to apply a voltage vector to the motor winding in the same direction as the rotor's permanent magnet magnetic field. In other words, SVPWM makes the Iq current of the motor winding zero and increases the absolute value of the Id current. Therefore, when the motor winding is that of a permanent magnet synchronous motor, the output torque of the permanent magnet synchronous motor can be avoided, preventing an increase in the energy storage time of the motor winding due to the output torque, thereby improving the high-voltage power-on efficiency of the electric vehicle.

[0046] In some embodiments, determining that the energy storage duration of the motor winding has reached a target duration and controlling the inverter to switch to a second operating mode includes: When the energy storage time of the motor winding reaches the target time, it is determined that the stored energy value of the motor winding has reached a preset threshold, and the inverter is controlled to switch to the second operating mode. The target duration is determined based on the preset threshold.

[0047] In some embodiments, due to the battery voltage U of the battery pack battery The inverter's capacitor C dc and preset voltage U dc,1 Given that, therefore, it can be based on the battery voltage U battery The inverter's capacitor C dc and preset voltage U dc,1 Determine the preset threshold : Then, by using experimental data from historical experiments, the energy storage value of the motor windings during energy storage is determined. Reaching the preset threshold The required duration is used to determine the target duration.

[0048] Alternatively, the stored energy value of the motor windings can be determined by examining the circuit characteristics of the electric vehicle's high-voltage network. Reaching the preset threshold When, the required time for: .

[0049] Determine the duration Then, the duration can be set. This is determined as the target duration, thus making the setting of the target duration more accurate.

[0050] Once the target duration is determined, the energy storage time of the motor windings can be timed during the energy storage process to detect whether the continuous energy storage time reaches the target duration. If the continuous energy storage time of the motor windings reaches the target duration, it can be determined that the stored energy value of the motor windings has reached a preset threshold. At this point, the inverter is controlled to switch to the second operating mode, allowing the motor windings to release energy to the DC bus. This timed triggering of the inverter switching to the second operating mode avoids false triggering due to energy fluctuations in the motor windings, thus improving the reliability of high-voltage power-on control for electric vehicles.

[0051] To further reduce damage to the main relay during high-voltage power-on, in some embodiments, the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and the electric vehicle is controlled to perform high-voltage power-on, including: If the bus voltage is detected to be consistent with the battery voltage, the electric vehicle is controlled to receive high-voltage power.

[0052] Considering that simply pre-charging the bus capacitor theoretically cannot bring the bus voltage up to the battery voltage of the battery pack, this would require the main relay to close only when there is a voltage difference. Closing the relay under these conditions would damage and age it. Therefore, in some embodiments, during the process of switching the inverter to the second operating mode and releasing energy from the motor windings to the bus capacitor, the BMS can detect whether the bus voltage and battery voltage are consistent. If they are consistent, the electric vehicle is then powered on at high voltage, such as by controlling the main relay to close via the BMS and disconnecting the pre-charge relay, thus completing the high-voltage power-on process for the electric vehicle. This reduces the voltage stress on the main relay during closure, minimizes damage to the main relay, and extends its lifespan.

[0053] To prevent the inverter from interfering with high-voltage power supply, some embodiments also include: If the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, the inverter is controlled to stop operating.

[0054] For example, the control unit can obtain the switching states of the main relay and the precharge relay from the BMS. If the main relay is found to be closed and the precharge relay is found to be open from the BMS, it can be determined that the bus voltage matches the battery voltage of the electric vehicle's battery pack, triggering high-voltage power-on. At this point, the inverter can be controlled to stop operating, such as by controlling the upper and lower bridge arms of the inverter to disconnect, thus ending the precharge auxiliary process.

[0055] Based on the above embodiments, using the motor windings for pre-charging assistance, the pre-charging time can be calculated as follows: .

[0056] And with the preset voltage U dc,1 Using the independent variable as the minimum value of the above equation, we can obtain the result when the preset voltage U is given. dc,1 =0.5*U battery At that time, the minimum charging time is: .

[0057] For the traditional pre-charging method, the time required for the bus voltage to rise to 95% of the battery voltage is: .

[0058] Therefore, the high-voltage power-on control method for electric vehicles provided in this application embodiment can effectively shorten the time required for high-voltage power-on of electric vehicles.

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below. In some embodiments, such as Figure 3 As shown, the high-voltage power-on control method for this electric vehicle includes: S201: During the pre-charging process of the bus capacitor of the electric vehicle, if the duration of the pre-charging reaches the preset duration, it is determined that the bus voltage of the electric vehicle reaches the preset voltage. Based on space vector modulation, the inverter of the electric vehicle is controlled to switch to the first operating mode and apply a voltage vector consistent with the direction of the rotor permanent magnet magnetic field to the motor winding so that the motor winding connected to the inverter receives the bus current for energy storage.

[0060] The preset duration is: ; Indicates the preset duration. This indicates the resistance value of the pre-charging resistor during the pre-charging process. This refers to the capacitor in the inverter. Indicates the preset voltage. This indicates the battery voltage.

[0061] S202: When the energy storage time of the motor windings reaches the target time, determine that the stored energy value of the motor windings has reached a preset threshold, and control the inverter to switch to the second operating mode. The target time is: ; Indicates the target duration. This indicates a preset threshold.

[0062] S203, when the inverter switches to the second operating mode, detects that the bus voltage is consistent with the battery voltage, controls the electric vehicle to be powered on at high voltage, and controls the inverter to stop operating.

[0063] The high-voltage power-on control device for electric vehicles provided in this application will be described below. The high-voltage power-on control device for electric vehicles described below can be referred to in correspondence with the high-voltage power-on control method for electric vehicles described above.

[0064] In one embodiment, such as Figure 4 As shown, a high-voltage power-on control device for an electric vehicle is provided, comprising: The energy storage control module 210 is used to determine that the bus voltage of the electric vehicle reaches a preset voltage during the pre-charging process of the bus capacitor of the electric vehicle, and control the inverter of the electric vehicle to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The high-voltage power-on module 220 is used to determine that the stored energy value of the motor winding reaches a preset threshold, control the inverter to switch to the second operating mode so that the motor winding releases the stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and control the electric vehicle to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage.

[0065] During the pre-charging process of the electric vehicle's bus capacitor, if the bus voltage of the electric vehicle is detected to reach a preset voltage, the inverter of the electric vehicle is controlled to switch to the first operating mode. This allows the motor windings connected to the inverter to receive bus current and store energy. When the stored energy value of the motor windings reaches a preset threshold, the inverter is controlled to switch to the second operating mode, allowing the motor windings to release the stored energy to the bus capacitor. This continues until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, at which point the electric vehicle is controlled to perform high-voltage power-on. Since the energy storage in the motor windings is not affected by the voltage difference between the battery pack and the bus, the energy storage and release by the motor windings after the bus voltage reaches the preset voltage allows the stored energy in the motor windings to quickly raise the bus voltage in the later stages of pre-charging, enabling the electric vehicle to meet the high-voltage power-on requirements. This shortens the time required for high-voltage power-on and improves the high-voltage power-on efficiency of the electric vehicle.

[0066] In one embodiment, the energy storage control module 210 is specifically used for: During the pre-charging process of the bus capacitor in the electric vehicle, the duration of the pre-charging is detected. When the duration reaches a preset duration, it is determined that the bus voltage of the electric vehicle reaches a preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The preset duration is determined based on the preset voltage.

[0067] In one embodiment, the preset duration is: ; in, This indicates the preset duration. This indicates the resistance value of the pre-charging resistor during the pre-charging process. This refers to the capacitor of the inverter. This indicates the preset voltage. This indicates the battery voltage.

[0068] In one embodiment, the energy storage control module 210 is specifically used for: Based on space vector modulation, the inverter of the electric vehicle is controlled to switch to the first operating mode, and a voltage vector consistent with the direction of the rotor permanent magnet magnetic field is applied to the motor winding, so that the motor winding connected to the inverter receives the bus current for energy storage.

[0069] In one embodiment, the high-voltage power-on module 220 is specifically used for: When the energy storage time of the motor winding reaches the target time, it is determined that the stored energy value of the motor winding has reached a preset threshold, and the inverter is controlled to switch to the second operating mode. The target duration is determined based on the preset threshold.

[0070] In one embodiment, the target duration is: ; in, Indicates the target duration. This refers to the preset threshold.

[0071] In one embodiment, the high-voltage power-on module 220 is specifically used for: If the bus voltage is detected to be consistent with the battery voltage, the electric vehicle is controlled to receive high-voltage power.

[0072] In one embodiment, the high-voltage power-on module 220 is further configured to: If the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, the inverter is controlled to stop operating.

[0073] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 can call a computer program in the memory 830 to execute a high-voltage power-on control method for an electric vehicle, such as including: During the pre-charging process of the bus capacitor of the electric vehicle, it is determined that the bus voltage of the electric vehicle reaches the preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. Once the stored energy value of the motor winding is determined to reach a preset threshold, the inverter is controlled to switch to the second operating mode so that the motor winding releases stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and the electric vehicle is controlled to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage.

[0074] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0075] On the other hand, embodiments of this application also provide a storage medium, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the high-voltage power-on control method for electric vehicles provided in the above embodiments, for example including: During the pre-charging process of the bus capacitor of the electric vehicle, it is determined that the bus voltage of the electric vehicle reaches the preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. Once the stored energy value of the motor winding is determined to reach a preset threshold, the inverter is controlled to switch to the second operating mode so that the motor winding releases stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and the electric vehicle is controlled to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage.

[0076] In some embodiments, an electric vehicle is also provided, including the electronic devices described in the above embodiments.

[0077] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0078] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A high-voltage power-on control method for an electric vehicle, characterized in that, include: During the pre-charging process of the bus capacitor of the electric vehicle, it is determined that the bus voltage of the electric vehicle reaches the preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. Once the stored energy value of the motor winding is determined to reach a preset threshold, the inverter is controlled to switch to the second operating mode so that the motor winding releases stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and the electric vehicle is controlled to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage. During the pre-charging process of the bus capacitor in an electric vehicle, if the bus voltage of the electric vehicle reaches a preset voltage, the inverter of the electric vehicle is controlled to switch to a first operating mode so that the motor windings connected to the inverter receive bus current for energy storage. This includes: During the pre-charging process of the bus capacitor in the electric vehicle, the duration of the pre-charging is detected. When the duration reaches a preset duration, it is determined that the bus voltage of the electric vehicle reaches a preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The preset duration is: ; This indicates the preset duration. This indicates the resistance value of the pre-charging resistor during the pre-charging process. This refers to the capacitor of the inverter. This indicates the preset voltage. This indicates the battery voltage; Determining that the stored energy value of the motor winding reaches a preset threshold, and controlling the inverter to switch to a second operating mode, includes: When the energy storage time of the motor winding reaches the target time, it is determined that the stored energy value of the motor winding has reached a preset threshold, and the inverter is controlled to switch to the second operating mode. The target duration is: ; Indicates the target duration. This refers to the preset threshold.

2. The high-voltage power-on control method for electric vehicles according to claim 1, characterized in that, Controlling the inverter of the electric vehicle to switch to a first operating mode, so that the motor windings connected to the inverter receive bus current for energy storage, includes: Based on space vector modulation, the inverter of the electric vehicle is controlled to switch to the first operating mode, and a voltage vector consistent with the direction of the rotor permanent magnet magnetic field is applied to the motor winding, so that the motor winding connected to the inverter receives the bus current for energy storage.

3. The high-voltage power-on control method for electric vehicles according to claim 1, characterized in that, Detecting that the bus voltage matches the battery voltage of the electric vehicle's battery pack, and controlling the electric vehicle to apply high-voltage power, includes: If the bus voltage is detected to be consistent with the battery voltage, the electric vehicle is controlled to receive high-voltage power.

4. The high-voltage power-on control method for electric vehicles according to claim 1, characterized in that... Also includes: If the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, the inverter is controlled to stop operating.

5. A high-voltage power-on control device for an electric vehicle, characterized in that, include: The energy storage control module is used to determine that the bus voltage of the electric vehicle reaches a preset voltage during the pre-charging process of the bus capacitor of the electric vehicle, and control the inverter of the electric vehicle to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The high-voltage power-on module is used to determine that the stored energy value of the motor winding reaches a preset threshold, control the inverter to switch to the second operating mode so that the motor winding releases the stored energy to the bus capacitor until the bus voltage is detected to match the battery voltage of the electric vehicle's battery pack, and control the electric vehicle to perform high-voltage power-on. The preset voltage and the preset threshold are determined based on the battery voltage. The energy storage control module is specifically used for: During the pre-charging process of the bus capacitor in the electric vehicle, the duration of the pre-charging is detected. When the duration reaches a preset duration, it is determined that the bus voltage of the electric vehicle reaches a preset voltage, and the inverter of the electric vehicle is controlled to switch to the first operating mode so that the motor winding connected to the inverter receives the bus current for energy storage. The high-voltage power-on module is specifically used for: When the energy storage time of the motor winding reaches the target time, it is determined that the stored energy value of the motor winding has reached a preset threshold, and the inverter is controlled to switch to the second operating mode. The preset duration is: ; This indicates the preset duration. This indicates the resistance value of the pre-charging resistor during the pre-charging process. This refers to the capacitor of the inverter. This indicates the preset voltage. This indicates the battery voltage; The target duration is: , Indicates the target duration. This refers to the preset threshold.

6. An electronic device comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the high-voltage power-on control method for an electric vehicle as described in any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1 to 4.

8. An electric vehicle, characterized in that, Including the electronic device as described in claim 6.

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