Vehicle Steering System Torque Cancellation for Low-Speed Response
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Solution Overview
Problem
The existing vehicle steering systems face challenges when steering at high speeds at low vehicle speeds, as the steering power assisting mechanism and transfer ratio control mechanism respond slowly, requiring excessive steering torque from the driver due to the slow response of both mechanisms.
Innovation Solution
A vehicle steering system that includes a steering power assisting unit, a transfer ratio control mechanism, a steering torque sensor, and a motor control circuit to detect and cancel the steering torque applied to the steering wheel until the transfer ratio control mechanism starts operation, ensuring timely response and reducing the need for excessive steering power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transfer ratio control mechanism increases the transfer ratio when steering speed becomes higher than a preset speed, then the steering response speed is improved, but the steering torque required by the driver increases excessively at low vehicle speeds
Solution Approach 1:
The steering power assisting mechanism provides preliminary assistance by detecting steering torque before the transfer ratio control mechanism activates. When the steering wheel is turned at low vehicle speeds, the power assisting mechanism immediately responds to reduce the steering torque required by the driver, preventing the abrupt torque increase that would otherwise occur when the transfer ratio control mechanism later increases the transfer ratio.
2Speed
If the steering power assisting mechanism operates at high steering speed, then the steering response is improved, but the mechanism cannot follow the speed and requires excessive driver power
Solution Approach 1:
The steering power assisting mechanism continuously monitors steering torque and steering speed through feedback from sensors, and dynamically adjusts the assisting power accordingly. When high steering speed is detected at low vehicle speeds, the system increases assisting power to match the driver's steering inputs, maintaining ease of operation throughout the steering process.
Data Source
AI summary
A vehicle steering system for steering vehicle wheels includes a steering wheel, a steering power assisting unit for providing assisting power when the steering wheel is steered, a transfer ratio control mechanism for controlling the ratio of a steering angle of the steering wheel to a steered angle of the vehicle wheels according to a vehicle condition; a steering torque sensor, a motor control circuit for controlling the driving motor so as to cancel the steering torque applied to the steering wheel when the steering torque sensor detects a steering torque applied to the steering wheel until the transfer ratio control mechanism starts operation. The transfer ratio control mechanism includes a transfer ratio changing mechanism and a driving motor for driving the transfer ratio changing mechanism.