Motor-Driven Vehicle Automatic Parking Torque Limitation Control
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Solution Overview
Problem
In motor-driven vehicles, automatic parking control can cause user discomfort and unease when the output torque of the motor is limited during parking, leading to slowdowns or vehicle rollback, especially when the load limitation ratio decreases due to temperature increases.
Innovation Solution
A motor-driven vehicle equipped with a controller that performs automatic parking control without user operation, which prohibits or stops the control when the load limitation ratio falls below a threshold, ensuring the motor's torque output is not continuously limited during parking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automatic parking control is performed when motor torque is limited, then automation capability is maintained, but vehicle stability and user comfort deteriorate due to slowdown or rollback
Solution Approach 1:
The controller continuously monitors the load limitation ratio and uses this feedback to dynamically adjust automatic parking control. When the load limitation ratio falls below the threshold, the controller prohibits or stops automatic parking control, preventing instability. This closed-loop feedback mechanism ensures automation is maintained only when conditions are safe and reliable.
2Reliability
If motor load rate is limited to protect motor from overheating, then motor reliability is improved, but automatic parking performance deteriorates due to torque limitation
Solution Approach 1:
The system dynamically adjusts the automatic parking control status based on real-time motor conditions. The load limitation ratio is continuously calculated from motor output torque and required torque, and the control state (permitted or prohibited) is dynamically changed according to whether this ratio exceeds the threshold. This dynamic adaptation allows the system to optimize both motor protection and parking performance under varying conditions.
3Extent of automation
If automatic parking control continues during high temperature operation, then automation is maintained, but user discomfort increases due to vehicle slowdown or rollback
Solution Approach 1:
The controller proactively prohibits automatic parking control before performance degradation occurs by monitoring the load limitation ratio in advance. When the ratio falls below the threshold indicating high temperature operation or torque limitation, the system preemptively stops automatic parking control, preventing user discomfort from slowdown or rollback rather than reacting after the problem occurs.
Data Source
AI summary
A motor-driven vehicle includes: a motor for traveling; an inverter that drives the motor; and a controller configured to perform automatic parking control for parking the motor-driven vehicle at a target parking position without depending on a user's vehicle operation, and prohibit or stop the automatic parking control when a load limitation ratio is less than a threshold value, the load limitation ratio indicating a limitation level of a torque which is able to be output from the motor in response to a required torque for the motor.