Differential Braking Steering Angle Estimation for SbW Failure
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Solution Overview
Problem
Steer-by-Wire systems in vehicles lack a means for the driver to manipulate steering in the event of a failure such as communication failure, leading to a loss of steering control.
Innovation Solution
An apparatus and method for estimating a steering angle based on differential braking, using an estimation model to determine coefficients that relate differential braking forces to steering angles, allowing for accurate estimation of steering angles even when the front wheels are in a free-rolling state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Steer-by-Wire system is implemented to improve space management efficiency and control performance, then vehicle control precision is improved, but driver's ability to manipulate steering during system failure is lost
Solution Approach 1:
The patent establishes a backup steering control mechanism that is pre-configured and ready to activate when the primary Steer-by-Wire system fails. This includes pre-defined control algorithms and actuation systems that can take over steering functions, ensuring continuous steering capability without complete loss of control during communication or system failures.
Solution Approach 2:
The patent introduces an intermediate backup system that mediates between the primary electronic steering control and direct mechanical steering. This intermediate layer includes backup actuators and control units that can bridge the gap when the primary system fails, providing a transitional control mechanism that maintains steering functionality.
2Reliability
If additional sensors are added to maintain steering control during failure, then steering control reliability is improved, but device complexity increases
Solution Approach 1:
The patent designs the backup steering control system to utilize existing vehicle components and sensors for multiple purposes. The same sensors and actuators used in normal Steer-by-Wire operation are repurposed for backup control, eliminating the need for entirely separate dedicated backup components and reducing overall system complexity.
Solution Approach 2:
The backup steering control system is designed to autonomously activate and operate using existing vehicle resources without requiring external assistance or additional complex control infrastructure. The system self-manages the transition from primary to backup mode and utilizes available vehicle components to maintain steering functionality.
Data Source
AI summary
An apparatus and method, and a non-transitory computer-readable storage medium storing a program for performing the method estimates a steering angle based on differential braking. The apparatus may include a memory configured to store an estimation model having at least one coefficient and defining the relationship between a differential braking force of a vehicle and a steering angle of free-rolling front wheels of the vehicle; and a processor configured to input test data comprising a plurality of differential braking forces and steering angles generated when the plurality of differential braking forces are applied to the estimation model, respectively, and determine the at least one coefficient of the estimation model.