Steer-by-Wire Sensor Shaft Layout for Accurate Road Wheel Angle
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Solution Overview
Problem
Steer by wire type steering systems suffer from errors in measuring the rotation angle of the road wheel, degrading driver's steering feeling and stability, especially as vehicle durability progresses.
Innovation Solution
A steer by wire type steering apparatus with an input shaft, output shaft, sensor shaft, and angle sensor to accurately measure the rotation angle of the wheel, using a torque sensor and electronic control device to control steering, and incorporating a reducer and pulley system to maintain precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steer by wire type steering system is used to eliminate mechanical connection devices, then the convenience of driving operation is improved, but the steering feeling and steering stability deteriorate due to error in measuring the rotation angle of the road wheel
Solution Approach 1:
The patent introduces a sensor shaft as an intermediary component that is mechanically connected to the road wheel through a sensor gear or sensor pulley. This sensor shaft rotates synchronously with the road wheel and carries an angle sensor that accurately measures the rotation angle. The intermediary mechanism ensures precise measurement of the road wheel's rotation angle, thereby maintaining steering feeling and stability while using a steer-by-wire system.
2Duration of action of stationary object
If the vehicle durability progresses, then the service life of the steering system is extended, but the error in measuring the rotation angle of the wheel increases, degrading steering feeling and stability
Solution Approach 1:
The patent implements a feedback mechanism where the angle sensor continuously monitors the rotation angle of the sensor shaft (which is synchronously rotated with the road wheel) and transmits this information to an electronic control device. The electronic control device uses this feedback to accurately determine the road wheel's rotation angle, compensating for any measurement errors that may occur during the vehicle's service life, thereby maintaining steering precision over extended durability.
Data Source
AI summary
A steer by wire type steering apparatus comprises an input shaft having one end coupled to a reducer and having an input gear formed on an outer circumferential surface of another end to transmit driving force of a motor, an output shaft having an output gear coupled to the input gear formed on one side of an outer circumferential surface, a first gear coupled to one end, and a pitman arm coupled to another end, a sensor shaft having one end coupled to a second gear coupled to the first gear, and an angle sensor coupled to an outer circumferential surface of the sensor shaft to detect a rotational angle of the sensor shaft and transmit the rotational angle of the sensor shaft to an electronic control device.