Brake Control Switching After Wheel Speed Sensor Failure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional brake systems fail to respond effectively to secondary collisions when a wheel speed sensor is damaged or separated from the ground during a collision, as they rely solely on electrical signals from these sensors for deceleration control.
Innovation Solution
A brake system that includes a controller utilizing both a wheel speed sensor and a pressure detection sensor to provide deceleration control, switching between target longitudinal deceleration and target braking pressure based on sensor integrity, with the controller detecting abnormalities and initiating appropriate deceleration strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake system relies solely on wheel speed sensor signals for deceleration control, then the control system is simple, but the system fails to respond when the wheel speed sensor is damaged or separated from the ground
Solution Approach 1:
The brake system performs preliminary detection of wheel speed sensor abnormalities by comparing sensor signals with vehicle deceleration data before a collision occurs. This allows the system to identify damaged or detached sensors in advance, ensuring reliable deceleration control can be maintained even when sensors fail during critical moments
Solution Approach 2:
The controller acts as an intermediary that cross-validates information from multiple sources (wheel speed sensors, pressure detection sensors, and deceleration data) to determine sensor integrity. This intermediary validation mechanism ensures that the brake system can detect sensor failures and switch to alternative control methods, maintaining reliability without requiring direct trust in any single sensor
2Reliability
If the brake system uses only wheel speed sensor data, then the response time is fast, but the system cannot detect sensor damage during collision accidents
Solution Approach 1:
The system implements feedback by continuously monitoring wheel speed sensor signals and comparing them with actual vehicle deceleration measurements. When discrepancies are detected (such as unrealistic speed changes or signals during collision), the system identifies sensor abnormalities and triggers alternative deceleration control strategies, ensuring reliable accident response
Solution Approach 2:
The brake system dynamically adapts its control strategy based on real-time sensor status. When wheel speed sensors are determined to be abnormal, the system automatically transitions from speed-based control to pressure-based control using pressure detection sensors, maintaining effective deceleration control throughout the dynamic accident scenario
3Adaptability or versatility
If the system switches control methods based on sensor status, then the system adaptability improves, but the control logic complexity increases
Solution Approach 1:
The control system is segmented into distinct operational modes: normal mode using wheel speed sensors, and abnormal mode using pressure detection sensors. The controller determines which mode to operate in based on simple abnormality detection criteria, making the adaptive logic manageable and maintainable while still providing versatile response to different sensor conditions
Data Source
AI summary
Disclosed herein are a brake system and a controlling method thereof. The brake system in accordance with the present embodiment includes a wheel speed sensor configured to output a signal responding to a speed of a vehicle, a pressure detection sensor configured to output a signal responding to a braking pressure of the vehicle, and a controller configured to detect whether the vehicle has an accident, based on a signal received from a shock detection senor configured to output a signal responding to a shock applied to the vehicle, and detect whether the wheel speed sensor has an abnormality based on the signal received from the wheel speed sensor, and the controller performs deceleration control of the vehicle based on the signal received from the wheel speed sensor when detecting that the wheel speed sensor has no abnormality and performs the deceleration control of the vehicle based on the signal received from the pressure detection sensor when detecting that the wheel speed sensor has the abnormality.