CN-122008912-A - Vehicle charging control method and device and vehicle

CN122008912ACN 122008912 ACN122008912 ACN 122008912ACN-122008912-A

Abstract

The invention relates to a vehicle charging control method, a vehicle charging control device and a vehicle, and relates to the technical field of vehicle charging, wherein the method comprises the steps of responding to the vehicle to perform boost charging and obtaining the electric angle of a motor of the vehicle; the control operation is repeatedly executed until the charging differential pressure is in a preset range, the charging differential pressure is determined, the three-phase bridge arm phase-shifting angle of the electric drive system is determined based on the charging differential pressure, the motor electric angle and a pre-calibrated mapping relation, wherein the mapping relation represents the corresponding relation between the combination of the charging differential pressure and the motor electric angle and the three-phase bridge arm phase-shifting angle, and the boost charging circuit is controlled to operate based on the three-phase bridge arm phase-shifting angle to charge the vehicle. According to the method and the device, when the phase dislocation control is carried out, the phase dislocation angle of the three-phase bridge arm of the electric drive system can be dynamically adjusted based on the charging pressure difference and the electric angle of the motor, so that the heating of the motor rotor is reduced as much as possible, the design complexity of a boosting charging system is avoided, and meanwhile, the boosting charging cost is reduced.

Inventors

WANG HAILONG
GUO SHANLONG
FU HAONAN
YUAN TAO

Assignees

小米汽车科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260327

Claims (14)

1. A vehicle charging control method, characterized in that the vehicle comprises a boost charging circuit comprising an electric drive system and a motor winding electrically connected; the vehicle charge control method includes: Responding to the vehicle to carry out boost charging, and acquiring the electric angle of a motor of the vehicle; The following control operations are repeatedly executed until the charging differential pressure is within a preset range: determining the charging differential pressure; Determining a three-phase bridge arm phase-shifting angle of the electric drive system based on the charging differential pressure, the motor electric angle and a pre-calibrated mapping relation, wherein the mapping relation represents a corresponding relation between a combination of the charging differential pressure and the motor electric angle and the three-phase bridge arm phase-shifting angle; And controlling the boost charging circuit to operate based on the three-phase bridge arm phase-shifting angle to charge the vehicle.
2. The vehicle charge control method according to claim 1, characterized in that the pre-calibration process of the map includes: determining a plurality of electromechanical angle sample values; Under the working condition of each motor electrical angle sample value, determining the association relationship between the combination of the charging differential pressure and the three-phase bridge arm phase-staggering angle and the motor eddy current loss; and calibrating to obtain the mapping relation based on the motor eddy current loss upper limit corresponding to each motor electrical angle sample value and the association relation.
3. The vehicle charge control method according to claim 1, characterized in that the following control operations are repeatedly performed until the charge pressure difference is within a preset range, including: Based on a preset control period, executing the control operation in a first control period; Judging whether the charging differential pressure after the first control period is finished is in the preset range or not; and if not, executing the control operation in the second control period.
4. The vehicle charge control method according to claim 1, characterized in that the map relationship includes a two-dimensional map; wherein determining the phase-shifting angle of the three-phase bridge arm of the electric drive system based on the charging differential pressure, the motor electrical angle and a pre-calibrated mapping relation comprises: Determining a corresponding upper limit of a differential pressure interval based on the charging differential pressure; And searching and determining a three-phase bridge arm phase-shifting angle corresponding to the combination in the two-dimensional mapping table based on the combination of the upper limit of the differential pressure interval and the electric angle of the motor.
5. The vehicle charge control method according to claim 1, characterized in that the map relationship includes a two-dimensional map; wherein determining the phase-shifting angle of the three-phase bridge arm of the electric drive system based on the charging differential pressure, the motor electrical angle and a pre-calibrated mapping relation comprises: determining a corresponding upper limit and a corresponding lower limit of a differential pressure interval based on the charging differential pressure; based on the upper limit of the differential pressure interval and the first combination of the motor electrical angles, searching and determining a first three-phase bridge arm phase-shifting angle corresponding to the first combination in the two-dimensional mapping table; Searching and determining a second three-phase bridge arm phase-shifting angle corresponding to the second combination in the two-dimensional mapping table based on the lower limit of the differential pressure interval and the second combination of the motor electrical angle; And interpolating the first three-phase bridge arm phase-shifting angle and the second three-phase bridge arm phase-shifting angle to determine the three-phase bridge arm phase-shifting angle of the electric drive system.
6. The vehicle charge control method according to claim 1, characterized by further comprising determining a switching frequency of the boost charging circuit before repeatedly performing the control operation; After determining the three-phase bridge arm phase-shifting angle of the electric drive system, the method further comprises the steps of correcting the three-phase bridge arm phase-shifting angle of the electric drive system based on the switching frequency to obtain a corrected three-phase bridge arm phase-shifting angle; wherein, based on the three-phase bridge arm phase staggering angle, control the boost charging circuit operation includes: and controlling the boost charging circuit to operate based on the corrected three-phase bridge arm phase-shifting angle.
7. The vehicle charge control method according to claim 1, characterized by further comprising, before repeatedly performing the control operation: Determining a charging current ripple limit of the boost charging circuit; After determining the phase-shifting angle of the three-phase bridge arm of the electric drive system, the method further comprises: Determining a lower limit value of a three-phase bridge arm phase-shifting angle based on the charging differential pressure, the motor electric angle and the charging current ripple limit; wherein, based on the three-phase bridge arm phase staggering angle, control the boost charging circuit operation includes: And controlling the boost charging circuit to operate based on the three-phase bridge arm misplacement angle of the electric drive system in response to the three-phase bridge arm misplacement angle of the electric drive system being higher than or equal to the lower limit value.
8. The vehicle charge control method according to claim 1, characterized in that the charge pressure difference is determined based on a difference between a real-time output voltage of an external charging device and a real-time battery voltage of the vehicle.
9. A vehicle control apparatus, wherein the vehicle comprises a boost charging circuit comprising an electric drive system and a motor winding electrically connected; the vehicle control apparatus includes: an electric angle acquisition unit configured to acquire a motor electric angle of the vehicle in response to the vehicle performing boost charging; a control unit for repeatedly executing the following control operations until the charging differential pressure is within a preset range: determining the charging differential pressure; Determining a three-phase bridge arm phase-shifting angle of the electric drive system based on the charging differential pressure, the motor electric angle and a pre-calibrated mapping relation, wherein the mapping relation represents a corresponding relation between a combination of the charging differential pressure and the motor electric angle and the three-phase bridge arm phase-shifting angle; And controlling the boost charging circuit to operate based on the three-phase bridge arm phase-shifting angle to charge the vehicle.
10. The vehicle control apparatus according to claim 9, further comprising a switching frequency acquisition unit configured to: determining a switching frequency of the boost charging circuit; wherein the control unit is configured to: After determining the three-phase bridge arm phase-shifting angle of the electric drive system, the method further comprises the steps of correcting the three-phase bridge arm phase-shifting angle of the electric drive system based on the switching frequency to obtain a corrected three-phase bridge arm phase-shifting angle; and controlling the boost charging circuit to operate based on the corrected three-phase bridge arm phase-shifting angle.
11. The vehicle control apparatus according to claim 9, further comprising a ripple limiting unit configured to: Determining a charging current ripple limit of the boost charging circuit; wherein the control unit is configured to: Determining a lower limit value of a three-phase bridge arm phase-shifting angle based on the charging differential pressure, the motor electric angle and the charging current ripple limit; And controlling the boost charging circuit to operate based on the three-phase bridge arm misplacement angle of the electric drive system in response to the three-phase bridge arm misplacement angle of the electric drive system being higher than or equal to the lower limit value.
12. A vehicle, characterized by comprising: A processor; A memory for storing processor-executable instructions; Wherein the processor is configured to implement the steps of the vehicle charge control method of any one of claims 1 to 8.
13. A non-transitory computer readable storage medium, characterized in that instructions in the storage medium, when executed by a processor of a vehicle, enable the vehicle to perform a vehicle charge control method according to any one of claims 1 to 8.
14. A computer program product comprising a computer program which, when executed by a processor, implements the vehicle charge control method according to any one of claims 1 to 8.

Description

Vehicle charging control method and device and vehicle Technical Field The disclosure relates to the technical field of vehicle charging, and in particular relates to a vehicle charging control method and device and a vehicle. Background When the output voltage of the charging pile is lower than the battery voltage of the vehicle, the vehicle is required to perform boost charging. The main current boost charging system is realized by multiplexing a motor winding and an electric driving system, and in the charging process, the electric driving system can be controlled to carry out in-phase or misphase fixed angles. However, due to the ripple limitation of the charging current, the in-phase control requires an external boost inductor, which results in an increase in the volume and cost of the boost charging system. The phase-misphase fixed angle control can lead to the fact that the composite magnetomotive force of the motor is not 0, the motor rotor generates heat seriously, the service life of the motor is endangered, and in order to solve the problem, more cost is needed to solve the heat generation. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of Invention In order to overcome the problems in the related art, the present disclosure provides a vehicle charging control method and apparatus, and a vehicle. According to a first aspect of embodiments of the present disclosure, there is provided a vehicle charge control method, the vehicle including a boost charging circuit including an electric drive system and a motor winding electrically connected, the method comprising: Responding to the vehicle to carry out boost charging, and acquiring the electric angle of a motor of the vehicle; The following control operations are repeatedly executed until the charging differential pressure is within a preset range: determining the charging differential pressure; Determining a three-phase bridge arm phase-shifting angle of the electric drive system based on the charging differential pressure, the motor electric angle and a pre-calibrated mapping relation, wherein the mapping relation represents a corresponding relation between a combination of the charging differential pressure and the motor electric angle and the three-phase bridge arm phase-shifting angle; And controlling the boost charging circuit to operate based on the three-phase bridge arm phase-shifting angle to charge the vehicle. In some possible embodiments of the disclosure, the pre-calibration process of the mapping relationship includes: determining a plurality of electromechanical angle sample values; Under the working condition of each motor electrical angle sample value, determining the association relationship between the combination of the charging differential pressure and the three-phase bridge arm phase-staggering angle and the motor eddy current loss; and calibrating to obtain the mapping relation based on the motor eddy current loss upper limit corresponding to each motor electrical angle sample value and the association relation. In some possible embodiments of the present disclosure, the following control operations are repeatedly performed until the charging differential pressure is within a preset range, including: Based on a preset control period, executing the control operation in a first control period; Judging whether the charging differential pressure after the first control period is finished is in the preset range or not; and if not, executing the control operation in the second control period. In some possible embodiments of the disclosure, the mapping relationship includes a two-dimensional mapping table; wherein determining the phase-shifting angle of the three-phase bridge arm of the electric drive system based on the charging differential pressure, the motor electrical angle and a pre-calibrated mapping relation comprises: Determining a corresponding upper limit of a differential pressure interval based on the charging differential pressure; And searching and determining a three-phase bridge arm phase-shifting angle corresponding to the combination in the two-dimensional mapping table based on the combination of the upper limit of the differential pressure interval and the electric angle of the motor. In some possible embodiments of the disclosure, the mapping relationship includes a two-dimensional mapping table; wherein determining the phase-shifting angle of the three-phase bridge arm of the electric drive system based on the charging differential pressure, the motor electrical angle and a pre-calibrated mapping relation comprises: determining a corresponding upper limit and a corresponding lower limit of a differential pressure interval based on the charging differential pressure; based on