Brake Control Unit Validation Against Underbraking Commands
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Solution Overview
Problem
Existing braking systems fail to adequately address partial functional failures in the vehicle controller, which are difficult to detect and not adequately covered by existing safety measures, potentially leading to erroneous control information and underbraking.
Innovation Solution
A method for controlling a braking system that involves transmitting pedal-sensor data to a brake control unit, calculating preprocessing data, and determining whether control information from the vehicle controller falls below a safety threshold before forwarding it to the electromechanical wheel brakes, with the brake control unit overwriting erroneous information to prevent underbraking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle controller calculates and transmits control information for wheel brakes, then the braking system can deliver detailed braking behavior adapted by the manufacturer, but partial functional failures in the vehicle controller may go undetected leading to erroneous control information and underbraking
Solution Approach 1:
The brake control unit serves as an intermediary between the vehicle controller and the electromechanical wheel brakes. It receives control information from the vehicle controller, validates it against safety thresholds, and only forwards corrected information to the wheel brakes. This mediator role allows the system to maintain the vehicle controller's detailed braking behavior capabilities while adding a safety layer that detects and corrects partial failures without requiring complete architectural redesign.
Solution Approach 2:
The brake control unit performs preliminary validation of control information before forwarding it to the wheel brakes. By checking whether control information falls below safety thresholds and correcting erroneous data in advance, the system prevents underbraking caused by partial failures in the vehicle controller, rather than reacting after the failure occurs.
2Reliability
If the brake control unit validates and corrects control information from the vehicle controller, then safety-relevant underbraking is prevented, but the processing time and computational load increase
Solution Approach 1:
The validation process focuses on checking specific critical parameters of the control information, such as whether braking forces fall below safety thresholds, rather than performing exhaustive validation of all control data. This selective parameter checking approach maintains high detection capability while minimizing processing time and computational overhead.
3Reliability
If redundant validation at the brake control unit is implemented, then partial functional failures are detected, but the system requires additional monitoring capabilities
Solution Approach 1:
The brake control unit implements a feedback mechanism that continuously monitors control information from the vehicle controller and compares it against safety thresholds. When deviations are detected, the system provides feedback by correcting the control information before forwarding it to the wheel brakes, creating a closed-loop safety verification system that automatically detects and responds to partial failures.
Data Source
AI summary
A brake system and method for controlling a braking system comprises transmitting pedal-sensor data to a brake control unit, calculating preprocessing data with the brake control unit, transmitting the preprocessing data to a vehicle controller, calculating control information for at least one electromechanical wheel brake from the preprocessing data in the vehicle controller, and transmitting the control information for the electromechanical wheel brake to a brake control unit. The at least one brake control unit determines whether the control information received from the vehicle controller falls below a safety threshold before forwarding the control information to the at least one electromechanical wheel brake, and, overwrites the control information before forwarding to the at least one electromechanical wheel brake when the control information is below the safety threshold.