Pushbutton Device for Electropneumatic Parking Brake Fault Detection
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Solution Overview
Problem
Conventional pushbutton devices for actuating electropneumatic parking brakes have complex cabling and evaluation methods, making fault detection cumbersome and requiring significant memory space, with limited ability to reliably detect switch positions and faults.
Innovation Solution
A simplified pushbutton device with a redundant internal circuit using two connecting lines and input resistance for fault detection, allowing for straightforward potential measurement and reduced complexity in program routines, enabling efficient recognition of switch positions and faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pushbutton device with multiple switches and resistors is used for fault detection, then fault detection capability is improved, but device complexity and cabling complexity increase
Solution Approach 1:
The patent combines multiple switches and resistors into a single integrated pushbutton device with a unified evaluation circuit. The control device evaluates all switch positions and fault conditions through a single integrated structure rather than through separate components connected by multiple cables, thereby reducing cabling complexity while maintaining fault detection capability.
Solution Approach 2:
The pushbutton device is designed to perform multiple functions through a single integrated structure: it can detect normal switch positions, identify various fault conditions (contact faults, wire breaks), and provide redundant evaluation all through one device. This multi-functionality eliminates the need for separate components and reduces overall system complexity.
2Reliability
If multiple resistors and switches are used for redundant fault detection, then detection reliability is improved, but memory space requirements increase
Solution Approach 1:
The patent extracts the complex memory-intensive fault detection algorithms from the control device and replaces them with a simplified evaluation circuit integrated into the pushbutton device itself. This extraction allows the control device to use minimal memory space while maintaining detection reliability through the integrated circuit's inherent evaluation capabilities.
3Measurement precision
If a complex evaluation method with cyclic querying is used, then fault detection accuracy is improved, but processing time and complexity increase
Solution Approach 1:
The integrated evaluation circuit within the pushbutton device performs continuous self-evaluation of switch positions and fault conditions without requiring complex cyclic querying by the control device. The circuit automatically monitors its own state and provides clear evaluation signals, simplifying the overall evaluation method while maintaining high detection accuracy.
Data Source
AI summary
A pushbutton device for actuating an electropneumatic parking brake (EPH) of a vehicle, which is connected to an evaluating electronic unit via connecting cables. In order to detect switching processes and/or faults, the input resistance of the pushbutton device between the connecting points is evaluated, thus allowing the evaluating electronic unit to reliably detect both the switched position of the pushbutton device and potential fault conditions.