Wheel Motor Torque Limiting Before Predicted Overload
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Solution Overview
Problem
Existing vehicle control systems struggle to effectively manage driving torque and regenerative torque to prevent overheating of driving motors, especially during conditions that require output torque exceeding the rated output.
Innovation Solution
A control apparatus that includes processors and memories to predict output increased states ahead during vehicle travel and limit the driving torque and regenerative torque of relevant driving motors to under the rated output until the increased state occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the driving motor operates at output torque exceeding the rated output to provide sufficient motive power, then the vehicle performance is improved, but the temperature of the driving motor rises causing lowered performance
Solution Approach 1:
The control apparatus predicts future road gradients and weather conditions in advance, then proactively limits the output torque of driving motors before temperature rise occurs. This preliminary action prevents overheating while maintaining vehicle performance when needed.
Solution Approach 2:
The system applies counter-action by limiting output torque before the harmful effect (temperature rise) occurs. By predicting future conditions requiring high power, the system preemptively restricts motor output to prevent temperature increase that would later degrade performance.
2Power
If regenerative power generation control is made during downhill-road travel, then sufficient motive power performance is exhibited during subsequent flat-road or uphill-road travel, but the regenerative braking force must be suppressed to prevent temperature rise
Solution Approach 1:
The control apparatus predicts upcoming road conditions and weather in advance, then limits regenerative braking force beforehand to prevent temperature rise. This allows the driving motor to maintain performance capability for subsequent high-power需求的 scenarios.
Solution Approach 2:
The system continuously monitors driving motor temperature, output torque, and predicted future conditions, then adjusts regenerative braking force dynamically. This feedback control optimizes energy recovery while preventing temperature-related performance degradation.
3Reliability
If the output torque is limited to under rated output to suppress temperature rise, then driving motor performance is maintained, but the vehicle cannot provide sufficient power when high output is needed
Solution Approach 1:
The control apparatus dynamically adjusts output torque limits based on real-time temperature data, predicted road gradients, and weather conditions. The limitation is not fixed but adapts to changing conditions, allowing high power when cool and necessary, while preventing overheating when temperature rises.
Solution Approach 2:
The system uses its own temperature monitoring and prediction capabilities to automatically adjust output limits without external intervention. The driving motor's operational state informs the control decisions, creating a self-regulating system that maintains reliability while maximizing power when safe.
Data Source
AI summary
A control apparatus for a vehicle is provided. The vehicle includes driving motors provided for respective wheels. The driving motors each output driving torque for the vehicle and output regenerative torque. The control apparatus includes: one or more processors; and one or more memories communicably coupled to the one or more processors. The processors predict an output increased state ahead in a direction of travel of the vehicle. The output increased state causes output torque of any of the driving motors to be larger than a rated output. On the condition that the output increased state is predicted, the processors limit the driving torque and the regenerative torque of a relevant one of the driving motors expected to produce an output larger than the rated output in the output increased state, to under the rated output, until the output increased state occurs.