Vehicle Motor Torque Control Mode Switching
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Solution Overview
Problem
Existing vehicle control systems fail to manage motor loads effectively during high-demand situations like sport driving, leading to overheating and reduced output, as they do not allow for necessary increases in motor output while maintaining load suppression.
Innovation Solution
A control device and method that switches between a first driving mode using continuous rated torque as an upper limit and a second mode using maximum rated torque as an upper limit, allowing the motor to operate within safer parameters during normal conditions and enabling higher output during special modes like sport driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor is driven with maximum rated torque as an upper limit, then the vehicle output is improved, but the motor overheating and reliability deteriorate
Solution Approach 1:
The system dynamically switches between two driving modes (first driving mode with continuous rated torque limit and second driving mode with maximum rated torque limit) based on driver input through the operation device. This dynamic adaptation allows the motor to operate at maximum power when needed while maintaining reliability through the first driving mode, resolving the contradiction between power output and motor reliability.
Solution Approach 2:
The control device changes the torque upper limit parameter based on the driving mode. In the first driving mode, the torque upper limit is set to continuous rated torque for reliable operation, while in the second driving mode, it is increased to maximum rated torque for high power output. This parameter change allows the system to balance between power and reliability based on operational requirements.
2Reliability
If the motor operates at continuous rated torque as an upper limit, then the motor reliability is improved, but the vehicle power output is reduced
Solution Approach 1:
The system provides dynamic switching between conservative first driving mode (continuous rated torque) and aggressive second driving mode (maximum rated torque) based on driver demand. This allows the motor to maintain reliability through continuous rated torque operation when needed, while enabling maximum power output when the driver selects the second driving mode.
Solution Approach 2:
The torque upper limit parameter is changed based on driving mode selection. When continuous rated torque is used as the limit, motor reliability is maintained. When maximum rated torque is used as the limit, vehicle power output is maximized. The control device enables parameter changes to balance reliability and power output according to operational needs.
3Power
If the motor output is increased during high-demand situations, then the vehicle performance is improved, but the heat generation and load on motor increase
Solution Approach 1:
The system dynamically adjusts motor output based on driver demand through operation device input. When the driver requests high performance, the system switches to second driving mode with maximum rated torque, accepting increased heat generation for improved vehicle performance. When lower demand exists, the first driving mode with continuous rated torque reduces heat generation while maintaining adequate performance.
Solution Approach 2:
The torque upper limit parameter is changed to match driving demands. Increasing the parameter to maximum rated torque enables higher motor output and vehicle performance but increases heat generation. Reducing the parameter to continuous rated torque decreases heat generation. The control device manages this trade-off by allowing parameter changes based on operational requirements.
Data Source
AI summary
A control device of a vehicle includes a motor controller. The motor controller is capable of controlling a motor configured to generate a driving force of the vehicle, and switching between a first driving mode for driving the motor while using a continuous rated torque as an upper limit and a second driving mode for driving the motor while using a maximum rated torque as an upper limit, the continuous rated torque being lower than the maximum rated torque generatable by the motor. The motor controller drives the motor in the first driving mode in a case where a driver does not specify a driving mode.