Vehicle Motor Control Mode Switching for Wheel Lock Traversal
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Solution Overview
Problem
The continuous supply of electricity to switching devices during motor torque increase in vehicles causes excessive temperature rise, limiting motor torque and hindering wheel movement over level differences, despite sufficient motor capability.
Innovation Solution
A vehicle control apparatus that switches control modes from torque control to speed control when a motor lock is detected, allowing the motor to rotate at a predetermined speed to avoid excessive temperature and enable smooth traversal of level differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If motor torque is increased to enable wheel movement over level difference, then the motor capability is utilized, but the temperature of switching devices excessively increases
Solution Approach 1:
The control system dynamically switches between torque control mode and speed control mode based on motor rotation state. When motor rotation is detected (wheel moving over level difference), the system transitions to speed control mode to reduce switching device temperature, thereby dynamically adjusting control strategy to resolve the temperature-torque contradiction
Solution Approach 2:
The control mode parameter is changed based on motor rotation detection. By changing the control parameter from torque control to speed control when rotation is detected, the system manages switching device temperature while maintaining motor capability utilization
2Temperature
If motor torque is limited to suppress switching device temperature increase, then the temperature is controlled, but the wheels cannot move over the level difference
Solution Approach 1:
The system dynamically adjusts control mode based on real-time motor rotation detection. When motor rotation is detected (indicating wheels are moving over level difference), the system switches to speed control mode, allowing full motor capability utilization without premature torque limitation
Solution Approach 2:
The control system uses feedback from motor rotation detection to determine when to switch control modes. This feedback mechanism ensures torque is maintained during the critical phase of overcoming level difference, then transitions to temperature management once movement is achieved
3Power
If torque control mode is used to control motor torque, then the motor torque is precisely controlled, but the motor rotation may stop causing continuous electricity supply to switching devices
Solution Approach 1:
The control system dynamically switches between torque control and speed control modes based on motor rotation state. This dynamic adaptation prevents the motor rotation stoppage issue inherent in pure torque control, thereby improving switching device reliability
Solution Approach 2:
The control mode switching acts as an intermediary mechanism between torque control and direct motor operation. By introducing speed control mode as an intermediary state when rotation is detected, the system avoids the harmful effect of continuous electricity supply to switching devices
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
Enables vehicles to traverse level differences effectively by preventing excessive temperature rise in switching devices, utilizing the motor's full capability without driver discomfort.
Implementation Method 1
a traveling motor 14 configured to rotate about a rotation axis
Implementation Method 2
when a motor lock is detected in which the rotation of the traveling motor controlled in a power running state is stopped
Data Source
AI summary
A vehicle control apparatus includes a traveling motor and an accelerator operation part. The traveling motor is coupled to a wheel. The accelerator operation part is to be operated by a driver. The vehicle control apparatus includes a control system including a processor and a memory communicably coupled to each other. A control mode adapted to control the traveling motor includes a torque control mode of feedback-controlling a motor torque and a speed control mode of feedback-controlling a motor rotation speed. When a motor lock is detected, the control system detects an operation amount of the accelerator operation part and calculates a switching threshold by adding a predetermined amount to the operation amount. The control system switches the control mode to the speed control mode when: the accelerator operation part is further operated while the motor lock has continued; and the operation amount exceeds the switching threshold.