Electric Vehicle Torque Control System for Wheel Slip
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Solution Overview
Problem
Current traction control systems for hybrid and all-electric vehicles are inadequate due to differences in vehicle weight, weight distribution, and drive train torque and power capabilities compared to conventional vehicles, necessitating a system designed specifically for these alternative fuel vehicles.
Innovation Solution
A torque and traction control system for all-wheel drive electric vehicles that includes motor speed sensors, temperature sensors, steering sensors, brake sensors, and accelerator sensors, utilizing a second-stage feedback control system and transient torque boost feedforward control circuit to optimize torque distribution across wheels, accounting for wheel slip and other operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional traction control systems are used in electric vehicles, then the systems can detect wheel spin and redirect torque, but the systems are unsatisfactory due to differences in vehicle weight, weight distribution, and drive train torque capabilities
Solution Approach 1:
The control system is specifically designed with parameters optimized for electric vehicle characteristics including weight, weight distribution, and drive train torque capabilities. The system adjusts control parameters such as torque redistribution ratios and wheel spin detection thresholds to match EV-specific operating conditions, making the system adaptable and effective for electric vehicles rather than using generic conventional control parameters
2Force
If torque is increased to wheels with traction to improve safety, then traction is improved, but wheel spin and slippage occur under certain conditions
Solution Approach 1:
The system continuously monitors wheel speed sensors to detect wheel spin conditions and uses this feedback to dynamically adjust torque distribution. When wheel spin is detected on a driven wheel, the system automatically redirects torque away from the spinning wheel to wheels with better traction, creating a closed-loop control system that prevents harmful wheel spin while maintaining optimal traction force
Solution Approach 2:
The system takes preliminary action by detecting early signs of wheel spin through wheel speed sensors and preemptively redirecting torque before significant slippage occurs. The control system anticipates potential wheel spin conditions and adjusts torque distribution in advance to prevent the harmful effect from developing fully
3Reliability
If a sophisticated electronic control system is implemented to optimize torque distribution, then traction control improves, but system complexity increases
Solution Approach 1:
The electronic control system performs multiple functions including wheel spin detection, torque redistribution control, and various driving mode management (snow mode, sport mode, normal mode). By consolidating these functions into a single multi-functional control unit, the system achieves sophisticated traction control effectiveness while avoiding the complexity of having separate dedicated systems for each function
Data Source
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AI summary
A method and apparatus for optimizing the torque applied to the primary and assist drive systems of an all-electric vehicle is provided, the torque adjustments taking into account wheel slip as well as other vehicular operating conditions.