Motor Control Unit Distance-Based Parking Torque Control
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Solution Overview
Problem
The existing automatic parking assist systems in electric vehicles suffer from prolonged control delays and low accuracy due to lengthy signal transmission links, affecting the efficiency, safety, and reliability of the parking process.
Innovation Solution
A motor control unit that directly controls the motor to rotate by a preset angle based on a distance signal, decoupling the torque control from the traditional torque signal-based control, thereby shortening the signal link and improving control speed and accuracy during parking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traditional torque signal-based control link is used in automatic parking assist, then the control system can maintain compatibility with existing vehicle control architecture, but the control delay is prolonged and control accuracy is reduced due to the lengthy signal transmission path
Solution Approach 1:
The patent extracts the distance control function from the traditional torque signal-based control chain. The motor control unit directly receives distance signals and controls motor position based on distance information, bypassing the intermediate torque calculation and signal transmission steps. This extraction of the essential control function (distance-based positioning) eliminates unnecessary signal transmission links, thereby reducing control delay and improving accuracy.
Solution Approach 2:
The patent segments the control process into distinct operational modes: normal driving mode (using torque signals) and parking mode (using distance signals). By segmenting the control architecture, the system can optimize the signal transmission path specifically for parking operations, using direct distance-to-position control while maintaining the traditional torque-based control for other operations, thus improving parking control accuracy without affecting overall system compatibility.
2Speed
If the motor control unit directly controls the motor based on distance signals, then the control speed and accuracy are improved, but the control system complexity increases due to the need for direct position control functionality
Solution Approach 1:
The patent implements dynamic control mode switching within the motor control unit. The controller can dynamically transition between torque-based control mode and distance-based direct position control mode depending on the operational context (normal driving versus parking). This dynamic capability allows the system to achieve high-speed, high-accuracy parking control when needed, while maintaining compatibility with existing control architectures for other operations, thus managing complexity through adaptive functionality rather than permanent structural changes.
Data Source
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AI summary
This application provides a motor control unit and powertrain having an automatic parking assist control function for an electric vehicle, and an automatic parking assist control method for an electric vehicle. The powertrain includes a motor control unit and a motor, and the motor control unit is configured to control the motor to output torque. In a traveling process of the electric vehicle, the motor control unit is configured to: in response to a torque signal, control the motor to output a torque value indicated by the torque signal. In a parking process of the electric vehicle, the motor control unit is configured to control the motor to drive the electric vehicle to travel by a preset distance. In a process in which the motor control unit controls the motor to drive the electric vehicle to travel by the preset distance, the motor control unit controls the torque output by the motor to change with a traveling distance of the electric vehicle. According to the powertrain, the motor control unit, and the control method provided in this application, a signal transmission delay in an automatic parking assist process of the electric vehicle can be reduced, and a speed and accuracy of control of the automatic parking assist process can be improved.