Brake-by-Wire Diagnostics for Hidden Mechanical Fault Detection
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Solution Overview
Problem
Current diagnostic systems for vehicle brake-by-wire systems fail to account for the ability of electronic components to compensate for mechanical faults, leading to undetected mechanical issues.
Innovation Solution
A method and system for diagnostic monitoring of vehicle brake-by-wire systems that involve recording a reference excitation profile of a known healthy brake-by-wire unit, determining characteristic transfer functions, and comparing actual performance to expected performance using end-to-end and mechanical characteristic functions to identify deviations and provide diagnostic actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current diagnostic systems monitor brake-by-wire systems, then diagnostic information is provided, but mechanical faults remain undetected due to electronic compensation
Solution Approach 1:
The diagnostic system segments the brake-by-wire unit into multiple components (actuator, brake mechanism, sensors) and monitors each separately. By breaking down the system into measurable parameters like clamp force, actuator displacement, and pressure differential, the system can identify mechanical faults even when electronic compensation is active.
Solution Approach 2:
The system continuously monitors actual performance parameters and compares them against expected values, creating a feedback loop that detects deviations indicating mechanical faults. The comparison of actual clamp force versus expected clamp force provides ongoing feedback that reveals mechanical issues despite electronic compensation attempts.
2Reliability
If electronic components compensate for mechanical faults, then system performance is maintained, but fault detection becomes more difficult
Solution Approach 1:
The system changes the parameters being monitored from simple operational status to detailed physical measurements including clamp force, actuator displacement, and pressure differential. By measuring these physical parameters directly, the system can detect mechanical faults even when electronic compensation maintains overall performance.
Solution Approach 2:
The system introduces intermediary measurements (pressure differential across the brake mechanism, actuator displacement) that serve as mediators between the electronic control system and the mechanical components. These intermediary measurements reveal mechanical fault conditions that would otherwise be hidden by electronic compensation.
3Measurement precision
If advanced transfer function modeling is used, then fault detection accuracy is improved, but system complexity increases
Solution Approach 1:
The system creates a virtual model (transfer function) that copies the expected behavior of the brake-by-wire system. By comparing actual measurements against this virtual copy, the system achieves precise fault detection without adding physical complexity to the actual brake system.
Solution Approach 2:
The system replaces complex mechanical diagnostic procedures with computational analysis of transfer functions. Instead of using complex mechanical test equipment, the system uses mathematical models to analyze sensor data and detect faults, reducing physical complexity while maintaining or improving detection precision.
Data Source
AI summary
A method for diagnostic monitoring of a vehicle brake-by-wire system for a vehicle may include recording a reference excitation profile of a reference brake-by-wire unit. The method further may include identifying one or more characteristic functions of the reference brake-by-wire unit based at least in part on the reference excitation profile. The method further may include determining a performance of a vehicle brake-by-wire unit based at least in part on the one or more characteristic functions. The method further may include performing a diagnostic action based at least in part on the performance of the vehicle brake-by-wire unit.