Boost Charging Control for Electric Vehicle Vibration Reduction
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Solution Overview
Problem
The use of direct-current boost circuits in electric vehicles with high-voltage power batteries results in high costs, large volume, and heavy weight, and causes vehicle vibration due to torque generation in the motor winding during charging, adversely affecting driving and riding experience.
Innovation Solution
A boost charging method that determines the charging torque of the drive motor and sets a permitted charging current based on this torque, ensuring the charging current does not exceed this limit to alleviate vibration and improve the charging speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a direct-current boost circuit is separately disposed in the electric vehicle to enable high-voltage battery charging, then the charging capability is improved, but the cost, volume, and weight increase significantly
Solution Approach 1:
The motor controller is designed to perform multiple functions: both motor control during vehicle operation and voltage boosting during charging. By reusing the existing motor controller hardware for both purposes, the system eliminates the need for a separate boost circuit, reducing cost, volume, and weight while maintaining high-voltage charging capability
Solution Approach 2:
The patent combines the motor controller and boost circuit functions into a single integrated system. The motor controller's power semiconductor devices and control unit are used for both motor drive and voltage boosting operations, merging two previously separate functions into one unified component
2Device complexity
If the motor controller is used to boost voltage during charging, then the cost and volume are reduced, but torque is generated in the motor winding causing vehicle vibration
Solution Approach 1:
The control unit applies preliminary anti-action by generating reverse torque through the motor winding that counteracts the torque produced during voltage boosting. This compensating torque is applied in advance and continuously adjusted to cancel out the harmful vibrations before they affect the vehicle, allowing the motor controller to perform boosting without causing noticeable vibration
Solution Approach 2:
The system uses feedback control to detect the torque generated during boosting and dynamically adjusts the motor winding current to compensate for the harmful torque. The control unit continuously monitors the boosting process and applies corrective actions to maintain vehicle stability while performing voltage boosting
3Productivity
If high charging current is used to improve charging speed, then the charging time is reduced, but the vehicle vibration and impact are intensified
Solution Approach 1:
The system dynamically adjusts the charging current based on real-time conditions. The control unit modulates the charging current waveform and amplitude during the boosting process, optimizing the balance between charging speed and vibration generation. This dynamic control allows the system to maintain high charging speeds while minimizing harmful torque fluctuations that cause vibration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces vehicle vibration and maintains charging speed by controlling the charging current within safe limits, enhancing the driving and riding experience.
Implementation Method 1
use a power device in a motor drive system to boost a voltage
Implementation Method 2
a current is generated in a motor winding in a charging process, causing specific torque
Data Source
Figure 1
Figure 2~3
Figure 4~5(b)
AI summary
A boost charging method and apparatus, a device, and a vehicle are disclosed, and relate to the field of vehicle technologies. The boost charging method includes: determining charging torque of a drive motor in a vehicle when the vehicle is in a boost charging state; determining a permitted charging current of the vehicle based on the charging torque, where the permitted charging current is an allowed maximum charging current; and charging the vehicle by using a charging current not greater than the permitted charging current. When boost charging is performed on the vehicle, impact and vibration caused by boost charging can be alleviated while ensuring a charging speed of the vehicle, to improve driving and riding experience.