Traction Steer Detection and Compensation via Selective Brake Pressure
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Solution Overview
Problem
Current methods for detecting and compensating for traction steer in vehicles are inadequate, as they rely on passive torque reduction without distinguishing between actual traction steer events, leading to undesired steering wheel torque.
Innovation Solution
A system that compares the wheel speeds of driven wheels to detect wheel slip conditions and then assesses the vehicle's operating state to determine traction steer events, applying selective brake pressure to compensate for these events, potentially supplemented by engine torque reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive torque reduction is applied to compensate for traction steer, then steering wheel centering torque is improved, but vehicle torque is reduced arbitrarily without regard to whether a traction steer event is actually occurring
Solution Approach 1:
The system performs preliminary detection of wheel slip conditions and comparison of current versus expected operating states before applying torque reduction. This ensures torque compensation is only applied when actual traction steer events are detected, rather than arbitrarily reducing torque during all acceleration conditions.
Solution Approach 2:
The system continuously monitors wheel speeds, compares current operating states to expected states, and uses this feedback information to determine when traction steer events are occurring. This feedback mechanism enables adaptive torque reduction only when needed, improving both reliability and adaptability.
2Measurement precision
If wheel slip detection is used to identify traction steer events, then detection accuracy is improved, but system complexity increases due to multiple sensor comparisons and operating state evaluations
Solution Approach 1:
The system uses existing wheel speed sensors and operating state data from the vehicle's normal operation to detect traction steer events. By making these existing components serve the additional function of traction steer detection, the system achieves high detection accuracy without adding significant complexity through dedicated detection hardware.
Data Source
AI summary
A system, method, and computer program product for detecting and compensating for a traction steer event is provided. A first wheel speed of a first driven wheel is compared with a second wheel speed of a second driven wheel to determine whether a wheel slip condition has occurred. If a wheel slip condition is determined to have occurred, a current operating state of a vehicle is compared to an expected operating state of the vehicle to determine if a traction steer event has occurred. If a traction steer event is determined to have occurred, brake pressure is selectively applied to the first or second driven wheel to compensate for the traction steer event.