Rear-Wheel Steering Lead Screw Over Stroke Prevention
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Solution Overview
Problem
Rear-wheel steering systems experience over stroke issues due to motor inertia, leading to system damage and noise, as the lead screw can overshoot and move beyond its controllable range, causing impacts and discomfort.
Innovation Solution
A method using a linear sensor with first and second sensor outputs to detect the lead screw's position, restricting its movement when it enters preliminary sections and switching direction when it exceeds the controllable area, by adjusting motor speed and current supply, and changing current polarity to prevent over stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor operates at high speed to respond to steering angle changes, then the responsiveness of the steering system is improved, but the lead screw overshoots and impacts the housing due to inertia, causing system damage and noise
Solution Approach 1:
The linear sensor detects the lead screw position in advance and sends feedback signals to the controller before the lead screw reaches the end of its stroke. The controller uses this preliminary information to adjust motor speed and prevent overshooting, thereby maintaining both high responsiveness and system reliability
Solution Approach 2:
The linear sensor continuously monitors the lead screw position and provides real-time feedback to the controller. The controller adjusts the motor operation based on this feedback signal, reducing motor speed when the lead screw approaches the end of its stroke, thus preventing impact and damage while maintaining responsive steering
2Speed
If the motor operates at high speed for rapid steering response, then the responsiveness is improved, but noise is generated due to impacts, reducing driver comfort
Solution Approach 1:
The linear sensor provides continuous position feedback to the controller, enabling the controller to reduce motor speed before the lead screw reaches its stroke limit. This prevents impacts and the associated noise, maintaining driver comfort while preserving rapid steering response capability
Solution Approach 2:
The system detects the lead screw position in advance using the linear sensor and takes preliminary action to reduce motor speed before the lead screw approaches the end of its stroke. This prevents noise-generating impacts while maintaining responsive steering performance
3Device complexity
If the lead screw moves freely without position monitoring, then the device complexity is reduced, but the lead screw cannot be controlled to remain within the controllable area, causing over stroke
Solution Approach 1:
The linear sensor continuously monitors the lead screw position and provides feedback to the controller. The controller uses this information to adjust motor operation and keep the lead screw within the controllable area, ensuring position control reliability without excessive complexity
Solution Approach 2:
The patent replaces complex mechanical position-limiting mechanisms with a simpler electronic feedback system using a linear sensor and controller. This maintains reliable position control while reducing mechanical complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents lead screw over stroke by accurately detecting its position, maintaining it within the controllable range, reducing noise and system damage, and enhancing driver comfort by controlling motor speed and current.
Implementation Method 1
a magnet member (122) provided in the mobile member 120 and configured to generate a magnetic force, and an output unit (110) configured to sense a position of the magnet member 122
Data Source
AI summary
The present invention relates to a method of preventing over stroke in a rear-wheel steering system for a vehicle, and more particularly, to a method of preventing the over stroke of a lead screw using a linear sensor moving together with the lead screw in a rear-wheel steering system. In detail, there is provided a method of preventing over stroke in a rear-wheel steering system, including determining whether a linear sensor which moves in conjunction with a lead screw enters preliminary sections A of a stroke section a and restricting the movement of the lead screw when the linear sensor enters the preliminary sections A.