Steer-by-Wire Reaction Force Belt Drive for Steering Stability
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Solution Overview
Problem
Steer by wire type steering systems lack mechanical connection between the steering shaft and vehicle wheels, leading to reduced driver steering feeling and stability, particularly under high loads.
Innovation Solution
A steer by wire type steering apparatus incorporating a steering shaft, steering sensors, an electronic controller, pulleys, a driving belt, and a belt support member to provide accurate and continuous reaction force to the driver, maintaining steering stability through a reduction gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a steer by wire type steering system is used to eliminate mechanical connection devices, then the vehicle can be steered using only electric power, but the driver's steering feeling and steering stability are reduced due to no mechanical connection between the steering shaft and vehicle wheels
Solution Approach 1:
The patent introduces a reaction force generation mechanism as an intermediary between the steering wheel and the reduction gear. This mechanism includes a reaction force generation gear meshing with the reduction gear, creating a mechanical connection that transmits reaction force to the driver while maintaining the SBW system's electric power operation capability
Solution Approach 2:
The patent replaces traditional hydraulic or electro-hydraulic power steering systems with an electric power steering system using a motor and reduction gear. This substitution eliminates hydraulic components while maintaining steering assist functionality through electric power alone
2Ease of operation
If the steering shaft is mechanically connected to the steering wheel to provide steering feeling, then the driver can feel reaction force, but the steering shaft can rotate indefinitely reducing steering stability
Solution Approach 1:
The reaction force generation mechanism serves as an intermediary that provides steering feeling to the driver while preventing indefinite rotation of the steering shaft. The mechanism transmits reaction force through the steering shaft without allowing it to rotate freely
Solution Approach 2:
The reaction force generation mechanism applies preliminary counter-action to the steering shaft rotation. By meshing the reaction force generation gear with the reduction gear, the system pre-establishes a mechanical constraint that prevents indefinite rotation while maintaining steering feel
3Power
If a reduction gear is used to reduce motor rotation speed, then the steering motor can provide sufficient torque, but high load transmission to the reduction gear causes inconsistent reaction force feeling
Solution Approach 1:
The reaction force generation mechanism acts as an intermediary between the reduction gear and the steering shaft. It transmits reaction force from the reduction gear to the steering shaft while maintaining consistent force transmission even under high load conditions
Solution Approach 2:
The patent changes the mechanical parameters of the reaction force generation mechanism, specifically the gear ratio between the reaction force generation gear and the reduction gear. This parameter adjustment ensures consistent reaction force transmission to the driver regardless of the high load on the reduction gear
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
The apparatus ensures an accurate feeling of reaction force is transmitted to the steering wheel, even under high loads, enhancing driver steering stability and consistency.
Implementation Method 1
a driving belt coupled to the first pulley and the second pulley
Data Source
AI summary
A steer by wire type steering apparatus according to the embodiments of the present disclosure comprises a steering shaft coupled to a steering wheel to rotate, a steering sensor for detecting a rotation direction of the steering shaft, an electronic controller for operating a steering motor in forward and reverse directions according to the rotation direction sensed by the steering sensor, a first pulley provided on a shaft of the steering motor, a second pulley provided on the steering shaft, a driving belt coupled to the first pulley and the second pulley, and a belt support member that rotationally supports one side of the driving belt and is coupled to a reduction gear housing.