Redundant Wheel Speed Signal Processing for Brake Fault Isolation
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Solution Overview
Problem
Current vehicle braking systems with integrated wheel speed acquisition chips face increased costs due to the need for redundancy, as a single chip failure can disable all wheel speed sensors, and existing designs do not adequately address functional safety and redundancy requirements.
Innovation Solution
An independent redundant wheel speed processing system with four wheel speed sensors and signal processing units, each equipped with drive and wheel speed diagnostics, and two MCUs for redundancy, ensuring fault detection and signal validation through multiple paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If highly integrated wheel speed acquisition chips are used to collect signals from four wheel speed sensors, then the system integration is improved, but a single chip failure causes loss of signals from all four connected sensors, worsening system reliability
Solution Approach 1:
The patent divides the wheel speed signal acquisition system into four independent processing units, each handling one wheel speed sensor. This segmentation ensures that a failure in one unit does not affect the other three, thereby improving system reliability while maintaining integration through centralized MCU processing.
2Reliability
If two acquisition chips and eight wheel speed sensors are equipped to ensure functional redundancy, then functional safety and redundancy are improved, but the overall cost of the braking system is considerably increased
Solution Approach 1:
The system uses four independent signal processing units, each dedicated to one wheel speed sensor, allowing individual fault isolation and continued operation with remaining functional units. This reduces the need for complete redundancy while maintaining functional safety.
Solution Approach 2:
Each signal processing unit includes self-diagnostic capabilities to detect and report faults automatically. This self-monitoring function provides safety assurance without requiring additional redundant hardware, thereby reducing overall system cost while maintaining functional safety.
3Reliability
If independent wheel speed signal processing units with diagnostic modules are used for each sensor, then fault detection capability is improved, but the device complexity is increased
Solution Approach 1:
The patent combines the signal processing and diagnostic functions into integrated processing units that handle both wheel speed signal acquisition and fault detection for each sensor. This merging approach improves fault detection capability while managing complexity through standardized modular design.
Data Source
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AI summary
An independent redundant wheel speed processing system, comprising four wheel speed sensors (1, 2, 3, 4) respectively provided on four wheels, the four wheel speed sensors (1, 2, 3, 4) being in communication connection to an MCU by means of four wheel speed signal processing units respectively. The four wheel speed signal processing units respectively perform diagnosis of driving anomalies and wheel speed signal anomalies of the four wheel speed sensors (1, 2, 3, 4) and send to the MCU diagnosis results. Thus, using the independent wheel speed signal processing units can ensure the function safety requirement and the function redundancy requirement of brake systems, thereby reducing the high cost of brake systems. Further provided is an independent redundant wheel speed processing method based on the independent redundant wheel speed processing system.