Automatic Vehicle Steering Feedback for Lateral-Acceleration Control
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Solution Overview
Problem
Conventional motor vehicle steering systems cause sharp steering and increased lateral acceleration, leading to driver anxiety and unpleasant feelings due to erroneous recognition by cameras and satellite-based information.
Innovation Solution
A motor vehicle steering system that includes a steering control-quantity calculation unit, lateral acceleration detection, a steering control-quantity limit-value calculation unit, and a limiting unit to limit lateral acceleration to a predetermined limit-value, using a deviation calculator and amplifier to adjust steering control quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If steering control is performed based on camera and satellite-based information to follow target running road-route line, then the motor vehicle can automatically steer along the desired path, but erroneous recognition may cause sharp steering and increased lateral acceleration leading to driver anxiety
Solution Approach 1:
The system continuously detects lateral acceleration and feeds this information back to the steering control-quantity calculation unit. When lateral acceleration exceeds the limit-value, the system adjusts the steering control quantity to reduce it, creating a closed-loop feedback mechanism that prevents excessive lateral acceleration and driver anxiety while maintaining automatic steering functionality
Solution Approach 2:
The system dynamically changes the steering control quantity parameter based on detected lateral acceleration conditions. When lateral acceleration exceeds the predetermined limit-value, the steering control quantity is reduced to a lower value, thereby adjusting the system's behavior to prevent driver anxiety while maintaining automated path following
2Reliability
If steering control quantity is increased to correct erroneous recognition and return to target path, then the motor vehicle can quickly recover from deviation, but this causes sharp steering and unpleasant feelings for the driver
Solution Approach 1:
The lateral acceleration detection unit continuously monitors steering actions and provides feedback to the steering control-quantity calculation unit. When lateral acceleration exceeds the limit-value during path correction, the system reduces the steering control quantity to prevent sharp steering, thereby maintaining path following accuracy while ensuring driver comfort
Solution Approach 2:
The system dynamically adjusts the steering control quantity based on real-time lateral acceleration conditions. Instead of applying fixed aggressive correction, the steering control quantity is adaptively reduced when lateral acceleration exceeds limits, creating a dynamic response that balances path recovery with driver comfort
Data Source
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AI summary
A motor vehicle steering system comprises: a steering control-quantity calculation unit (10) for calculating a steering control quantity to move a motor vehicle closer to its target running road-route line; a lateral acceleration detection unit (2) for detecting a lateral acceleration of the motor vehicle; a steering control-quantity limit-value calculation unit (12) for calculating a steering control-quantity limit-value on the basis of a lateral acceleration detected by the lateral acceleration detection unit (2) in such a manner that a lateral acceleration of the motor vehicle is limited to a lateral acceleration limit-value; a limitation determination unit (11) for determining effectiveness of steering control-quantity's limitation or ineffectiveness thereof on the basis of the lateral acceleration; and a steering control-quantity limiting unit (13) for limiting a steering control quantity on the basis of the steering control-quantity limit-value, when the limitation determination unit (11) determines that steering control-quantity's limitation is effective.