Brake-Based Steering Backup With Adaptive Damping for SBW Failure
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Solution Overview
Problem
Steer-by-wire steering systems face issues with complete loss of steering performance due to communication failures, leading to potential accidents, and implementing redundancy systems increases costs.
Innovation Solution
The system uses a biased brake force of the braking system to steer the vehicle and adjusts damping forces of dampers to improve turning performance and stability when the steering system fails, without requiring additional redundancy actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundancy system is installed to implement fail safety when steering system fails, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The braking system is designed to perform its primary function (vehicle deceleration) and a secondary function (steering assistance) when the steering system fails. By applying biased brake torque to specific wheels, the braking system provides both deceleration and directional control, eliminating the need for separate redundancy steering actuators and reducing overall system complexity while maintaining fail safety
Solution Approach 2:
The patent replaces the need for mechanical redundancy steering actuators with a control-based approach using the existing braking system. Instead of adding duplicate mechanical steering components, the system uses electronic control to modulate brake torque distribution, substituting mechanical redundancy with a more integrated control solution that reduces device complexity
2Reliability
If biased brake force is applied to steer the vehicle when steering system fails, then reliability is improved, but turning performance deteriorates due to vehicle roll
Solution Approach 1:
The damping force of the dampers is dynamically adjusted based on the turning condition detected from steering angle or steering angular velocity. When turning is detected, the damping force is increased to minimize vehicle roll, thereby improving turning performance while the biased brake torque maintains steering capability. This parameter adjustment allows the system to adapt to different operating conditions and resolve the contradiction between reliability and ease of operation
3Ease of operation
If damping force of dampers is increased to improve turning performance, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The controller detects steering angle or steering angular velocity from sensors and uses this feedback to determine when the vehicle is turning. Based on this feedback, the controller automatically adjusts the damping force of the dampers to minimize roll and improve turning performance. This closed-loop feedback mechanism enables adaptive damping control without requiring complex manual intervention or additional hardware
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 accidents by implementing redundancy through biased brake steering and enhances turning performance and stability by optimizing damper damping forces, reducing the need for additional hardware and costs.
Implementation Method 1
control a damping force of a damper provided on each wheel of the host vehicle when the host vehicle starts turning
Implementation Method 2
steer the host vehicle with a biased brake torque when a steering system fails
Data Source
AI summary
The present disclosure provides a driving assistance apparatus of a host vehicle including a sensor configured to detect a steering angle or a steering angular velocity of a steering wheel of the host vehicle and a controller connected to the sensor, and the controller is configured to steer the host vehicle with a biased brake torque when a steering system fails and control a damping force of a damper provided on each wheel of the host vehicle when the host vehicle starts turning.