Vehicle Steering One-Side Pull Response Control
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Solution Overview
Problem
Existing vehicle steering devices face challenges in properly managing one-side pull during straight-ahead travel after a turn, leading to driver discomfort and potential vehicle instability due to the need for continuous steering corrections, especially on cant roads and in side winds.
Innovation Solution
A vehicle steering device with a one-side pull response control unit that detects steering torque and angle, and vehicle behavior, to calculate and apply a correction current value that restricts one-side pull, with the control being inhibited or reduced for a predetermined time after a turn to stabilize straight-ahead travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-side pull response control is continuously applied during straight-ahead travel after a turn, then one-side pull is restricted, but vehicle behavior becomes unstable due to premature control activation
Solution Approach 1:
The control execution determination unit delays activation of one-side pull response control for a predetermined period after a turn is detected to end. This preliminary waiting period ensures that the vehicle's transient behavior stabilizes before the control system activates, preventing instability while preparing for timely one-side pull correction when actually needed.
2Device complexity
If dead band is provided for steering torque control, then control simplicity is maintained, but driver comfort decreases due to load until torque exceeds dead band
Solution Approach 1:
The control execution determination unit dynamically changes the control parameter by setting a predetermined period based on turn detection. This replaces the static dead band approach with a time-based parameter adjustment that adapts to driving conditions, eliminating the abrupt torque threshold while maintaining control simplicity through temporal parameter management.
3Speed
If one-side pull control is immediately activated after turn detection, then response time is reduced, but excessive steering correction occurs due to unstable vehicle behavior
Solution Approach 1:
The system performs preliminary detection of turn end conditions and establishes a predetermined waiting period before activating one-side pull response control. This preliminary action phase allows the vehicle to complete its transient response from the turn, ensuring that when control activates, the steering correction is accurate and precisely targeted at the actual one-side pull condition.
Data Source
AI summary
A vehicle steering device including a steering torque detection unit that detects a steering torque, the vehicle steering device controlling an electric current value, which is applied to an electric motor, and applying an assist torque to a steering system based on the steering torque, includes a one-side pull response control unit that detects one-side pull generated at a vehicle, and corrects the current value to restrict the one-side pull. One-side pull response control is restricted or inhibited for a predetermined time after the vehicle ends a turn.