Electric Drive Module Torque Control for Vehicle Yaw Stability
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Solution Overview
Problem
Modern traction control systems in high-performance vehicles often fail to effectively manage drive torque to prevent wheel slippage, especially on low-friction surfaces or during acceleration, leading to suboptimal vehicle performance and energy inefficiency.
Innovation Solution
A method involving a drive module that determines yaw rate and acceleration errors, and coefficients of friction to dynamically adjust and limit drive torque to the wheels, using sensors and control algorithms to preemptively apply torque and maintain optimal traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drive torque is increased to improve vehicle acceleration performance, then productivity increases, but wheel slippage occurs on low-friction surfaces causing loss of traction control
Solution Approach 1:
The system preemptively reduces drive torque when yaw rate error or yaw acceleration error exceeds predetermined thresholds, or when coefficient of friction is below a threshold during acceleration events. This preliminary action prevents wheel slippage before it occurs, maintaining traction control while managing acceleration performance.
Solution Approach 2:
The control module continuously monitors yaw rate, yaw acceleration, and coefficient of friction, comparing actual values against reference values and thresholds. Based on this feedback, the system dynamically adjusts drive torque to prevent slippage, creating a closed-loop control system that maintains reliable traction control.
2Reliability
If secondary driveline or brakes are used to correct wheel slippage, then traction control is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent extracts the traction control function from complex mechanical systems (secondary driveline, brakes) and implements it through electronic torque management of the primary drive module. This reduces device complexity by eliminating or reducing the need for additional mechanical components while maintaining effective slippage correction.
3Reliability
If drive torque is reduced to prevent wheel slippage, then traction control is improved, but vehicle acceleration performance deteriorates
Solution Approach 1:
The system dynamically adjusts drive torque based on real-time conditions, reducing torque only when yaw rate error, yaw acceleration error, or coefficient of friction indicates slippage risk. During normal conditions, full torque is maintained for optimal acceleration performance, creating a dynamic balance between traction control and performance.
Data Source
AI summary
The present teachings provide a method for controlling transmission of power to a set of wheels of a vehicle. The method can include providing a drive module configured to provide an amount of drive torque for powering the set of vehicle wheels. The method can include determining a yaw rate of the vehicle and a first set of vehicle parameters. The method can include determining a reference yaw rate of the vehicle based on the first set of vehicle parameters. The method can include calculating a yaw rate error based on the yaw rate and the reference yaw rate. The method can include reducing the amount of drive torque provided by the drive module to the vehicle wheels based on the yaw rate error.