Electromechanical Wheel Brake Control for Regulator Fault Detection
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Solution Overview
Problem
Existing brake systems fail to adequately address partial functional failures in the vehicle regulator, which are challenging to detect and not adequately covered by current safety measures, leading to potential erroneous control information.
Innovation Solution
A brake system architecture with two primary wheel brake modules, each containing an electromechanical wheel brake and a brake control unit, connected via separate signal lines, and a basic control unit receiving information from both, allowing for independent monitoring and redundant signal paths to detect and correct erroneous control information from the vehicle regulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate redundant brake control units are used to detect partial functional failures, then failure safety is improved, but device complexity and installation outlay increase
Solution Approach 1:
The brake control unit is designed to perform multiple functions: it controls the electromechanical wheel brake during normal operation and simultaneously monitors the vehicle regulator for partial functional failures. The monitoring function is integrated into the existing control unit rather than being a separate redundant unit, allowing one component to serve dual purposes and reducing overall system complexity while maintaining failure safety
Solution Approach 2:
The monitoring function for detecting partial functional failures in the vehicle regulator is merged with the existing brake control unit. Instead of adding separate redundant control units, the monitoring capabilities are combined with the control functions in a single integrated unit, reducing installation outlay while achieving the desired failure safety
2Device complexity
If complete failure of vehicle regulator is assumed, then safety measures are simpler, but partial functional failures remain undetected
Solution Approach 1:
The brake control unit continuously monitors the vehicle regulator in advance to detect partial functional failures before they result in unsafe braking conditions. By performing preliminary detection and comparison of control information, the system can identify errors early and take corrective action, enhancing detection capability beyond what is possible with only complete failure assumptions
Solution Approach 2:
The system implements feedback by comparing control information from the vehicle regulator with independently determined control information in the brake control unit. This feedback mechanism allows the system to detect discrepancies indicating partial functional failures in the vehicle regulator, improving detection capability while maintaining manageable safety measure complexity
Data Source
AI summary
A brake system for a motor vehicle comprising a brake pedal having at least one pedal sensor for capturing a driver brake request using pedal sensor data. The brake system has four electromechanical wheel brakes, two brake control units, and a vehicle regulator. The brake control unit calculates preprocessing data from the pedal sensor data and makes the data available to the vehicle regulator via a signal connection. The vehicle regulator calculates control information for the wheel based on the preprocessing data. The brake system comprises two primary wheel brake modules which are each arranged on a vehicle wheel and in each case one of the electromechanical wheel brakes and one assigned brake control unit are integrated. The pedal sensor is connected to both brake control units via in each case one separate brake request signal line. A control method for such a brake system is also disclosed.