Automatic Brake Control Under Acceleration Sensor Failure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle control systems that activate automatic brakes to reduce collision damage may fail to perform effectively if an anomaly occurs in the acceleration sensor, leading to reduced effectiveness in reducing collision damage.
Innovation Solution
A vehicle control system that includes an obstacle detector, an acceleration detector, a collision determination unit, a deceleration setting unit, a brake control unit, an anomaly determination unit, and an adjusting unit. The system sets a target deceleration rate based on the collision probability and adjusts the brake control to generate a braking force according to a preset fixed value if an anomaly in the acceleration sensor is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the braking force is reduced when an acceleration sensor anomaly is detected, then the system maintains stability, but the effectiveness of collision damage reduction is compromised
Solution Approach 1:
The system dynamically adjusts the braking control strategy based on the anomaly detection state. When an acceleration sensor anomaly is detected, the system switches from normal feedback control (using real-time acceleration data) to a predetermined braking pattern with fixed deceleration rates. This dynamic adaptation ensures the system remains functional and effective under degraded conditions, maintaining collision damage reduction capability despite the sensor failure.
2Measurement precision
If feedback control based on real-time acceleration is used, then braking precision is improved, but system vulnerability to sensor failure increases
Solution Approach 1:
The system prepares compensatory measures in advance by establishing a predetermined braking pattern that can be activated when the acceleration sensor fails. This backup strategy cushions against the harmful effects of sensor failure, ensuring that the loss of real-time feedback control does not lead to complete system failure or ineffective braking during collision scenarios.
Solution Approach 2:
The anomaly determination unit acts as an intermediary that monitors the acceleration sensor's health status and triggers the switch between normal feedback control and predetermined braking patterns. This intermediary mechanism detects sensor failures and activates the appropriate control strategy, bridging the gap between sensor functionality and braking control effectiveness.
3Object-affected harmful factors
If automatic brake control is activated with high braking force, then collision damage reduction is maximized, but the risk of vehicle instability increases
Solution Approach 1:
The system changes the braking control parameters from variable feedback-based deceleration rates to fixed predetermined deceleration rates when an anomaly is detected. The predetermined pattern includes specific deceleration rate values and timing that are optimized to provide sufficient braking force for collision avoidance while maintaining vehicle stability, even without real-time acceleration feedback.
Data Source
Figure 1
Figure 2
AI summary
[Problem to be Solved] To provide a vehicle control system that can perform necessary automatic brake control even if an anomaly occurs in an acceleration sensor when a vehicle is likely to collide with an obstacle. [Solution] A vehicle control system 1 includes an obstacle detector 10 that detects an obstacle ahead of a vehicle, an acceleration detector 11 that detects the longitudinal acceleration rate of the vehicle, a collision determination unit 21a that determines the probability of collision with the obstacle, a deceleration setting unit 21b that sets a target deceleration for performing automatic brake control according to the collision possibility determined by the collision determination unit 21a, a brake control unit 21c that controls the deceleration rate of the vehicle on the basis of the longitudinal acceleration rate detected by the acceleration detector 11 such that a braking force is generated according to the target deceleration rate set by the deceleration setting unit 21b, an anomaly determination unit 22 that determines an anomaly of the acceleration detector 11, and an adjusting unit 25 that changes the target deceleration rate to a preset fixed value and adjusts the activation of the brake control unit 21c so as to generate a braking force according to the fixed value, when an anomaly of the acceleration detector 11 is determined by the anomaly determination unit 22.