EPB Pressure Sensor Self-Diagnosis Through Controlled Pressure Change
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Solution Overview
Problem
Current methods for diagnosing brake failures in electronic parking brakes often incorrectly assume pressure sensor failure, leading to unnecessary system inoperability and costly towing, due to limitations in space and cost for additional sensors, and indirect validation methods.
Innovation Solution
A sensor test system that includes a pressure setting module and a detection module to intentionally change pressure in the brake unit's pressure chamber or line, comparing the measured pressure to expected values to assess the pressure sensor's functionality and issue a warning if malfunction is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pressure sensors are installed for mutual control and plausibility checking, then the reliability of brake failure diagnosis is improved, but the device complexity and installation cost increase due to additional sensors and wiring
Solution Approach 1:
The existing pressure sensor performs self-diagnosis by monitoring its own output signals during brake application and release cycles. The detection module analyzes whether the sensor signal changes appropriately when pressure should increase or decrease, enabling the sensor to detect its own malfunctions without requiring additional sensors or complex wiring installations.
2Reliability
If the pressure sensor failure is assumed in worst-case scenarios, then the safety of the EPB system is improved, but the loss of time and productivity increase due to unnecessary system inoperability and vehicle towing
Solution Approach 1:
The detection module continuously monitors the pressure sensor output and provides feedback about sensor health status to the control unit. When a malfunction is detected, the system receives feedback to switch to a restricted operating mode, allowing continued vehicle operation while preventing unsafe brake applications, thereby avoiding unnecessary vehicle downtime and towing.
Data Source
AI summary
A sensor test system for a pressure sensor in an electronic parking brake (EPB) of a vehicle. The pressure sensor is configured to measure a pressure in a pressure chamber or in a pressure line of the EPB. The sensor test system includes a pressure setting module configured to set the pressure; and by a detection module configured to detect, based on pressure set by the pressure setting module and based on a measured pressure from the pressure sensor, a potential malfunction of the pressure sensor, and to issue a warning signal if the potential malfunction is detected.