Rear Wheel Steering Ramp-Up Control for Smooth Ignition Response
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Solution Overview
Problem
Existing rear wheel steering systems cause a sudden and noticeable change in vehicle handling when the ignition is turned on with a pre-set front wheel steering angle, leading to a discomforting experience for the driver.
Innovation Solution
A rear wheel steering control system that gradually steers the rear wheels at a gentle ramp-up slope from a neutral position to a target angle based on the front wheel steering angle, using a controller and rear wheel steering motor, with a ramp-up control mechanism to ensure a smooth transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RWS system performs rear wheel steering to generate a target rear wheel steering angle calculated as a value varied depending on the front wheel steering angle when the ignition is turned on in the state in which the front wheel steering angle is generated, then the rear wheel steering function is activated, but the rear wheels are rotated at a steep ramp-up slope and the driver feels a sense of difference due to rapid rear wheel steering
Solution Approach 1:
The control device determines whether the ignition is turned on in a state where a front wheel steering angle is generated before activating rear wheel steering. When this condition is detected, the system applies a gentle ramp-up slope to gradually steer the rear wheels to the target angle, preventing sudden movements and driver discomfort. This preliminary condition checking and gradual activation resolves the contradiction between system activation and driver comfort.
2Speed
If the rear wheels are steered rapidly to the target rear wheel steering angle, then the system responds quickly to ignition-on conditions, but the driver experiences a sense of difference due to the rapid steering change
Solution Approach 1:
The control device dynamically adjusts the rear wheel steering speed based on the detected ignition state. When the ignition is turned on with a front wheel steering angle present, the system applies a gentle ramp-up slope to gradually increase the rear wheel steering angle. This dynamic adjustment of steering speed resolves the contradiction between quick system response and driver comfort by adapting the response characteristics to the specific operational context.
Data Source
AI summary
A rear wheel steering control system and method for vehicles may gradually perform rear wheel steering at a gentle ramp-up slope, compared to a conventional rear wheel steering control system and method, for a predetermined time period when the ignition of a vehicle is turned on in the state in which a front wheel steering angle is generated, to prevent rear wheels from being rapidly steered and to eliminate a sense of difference felt by a driver due to rapid rear wheel steering.