Vehicle Actuator Control for Torque Limits and Road-Adaptive Wheel Speed
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Solution Overview
Problem
Current vehicle control systems for electric trucks face challenges in efficiently managing wheel forces and speeds, particularly on varying road conditions, which affects drivability, comfort, and safety.
Innovation Solution
A vehicle motion management system that determines desired wheel forces and speeds, using mapping models based on wheel characteristics and road conditions, to transmit control signals to an actuator control system, ensuring torque limits are not exceeded and maintaining safe wheel slip, even on slippery roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If torque control is used on dry roads, then propulsion efficiency is improved, but wheel slip control becomes unsafe on slippery roads
Solution Approach 1:
The control system dynamically switches between torque control mode and wheel speed control mode based on detected road conditions. On dry roads, torque control is applied for optimal propulsion efficiency. When slippery conditions are detected, the system transitions to wheel speed control to maintain safety, thus adapting the control strategy to changing environmental conditions.
Solution Approach 2:
The system changes the control parameter from torque (on dry roads) to wheel speed (on slippery roads) based on road condition detection. This parameter switching allows the system to optimize propulsion efficiency under normal conditions while ensuring safety under adverse conditions.
2Reliability
If wheel speed control is used on slippery roads, then safety is improved, but propulsion efficiency decreases
Solution Approach 1:
The control system dynamically selects the appropriate control mode based on real-time road condition assessment. Wheel speed control is activated only when slippery conditions are detected, ensuring safety is prioritized when necessary, while torque control is used during normal conditions to maintain propulsion efficiency.
Solution Approach 2:
The system switches control parameters between wheel speed (for safety on slippery roads) and torque (for efficiency on dry roads) based on environmental conditions, optimizing the trade-off between safety and propulsion efficiency.
3Device complexity
If a single control mode is used for all road conditions, then system complexity is reduced, but adaptability to varying road conditions deteriorates
Solution Approach 1:
The control system employs dynamic mode switching between torque control and wheel speed control based on detected road conditions. This allows the system to adapt to varying road surfaces (dry, wet, icy) while maintaining a relatively simple overall architecture through standardized control modules that can operate in different modes.
Solution Approach 2:
The control system is designed with multi-functionality, capable of operating in both torque control mode and wheel speed control mode using the same hardware platform. This universal design allows adaptation to different road conditions without requiring entirely separate control systems for each mode.
Data Source
AI summary
The present disclosure relates to a vehicle motion management system as well as an actuator control system of a vehicle. The vehicle motion management system and actuator control system are arranged to control operation of at least one actuator configured to apply a torque to at least one wheel of the vehicle. The vehicle motion management system is configured to transmit a control signal to the actuator control system, wherein the actuator control system is configured to, based on the control signal, generate an operating torque to be executed subject to the torque limit and the desired wheel speed.