ABS Signal Processing for Wheel Sensor Failure Compensation
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Solution Overview
Problem
Existing vehicle brake systems face instability and increased costs due to the requirement for redundant wheel sensor systems to prevent deactivation of the Anti-lock Braking System (ABS) in case of a wheel signal failure, especially in autonomous or partially autonomous driving scenarios, where the ABS must remain functional to ensure vehicle stability.
Innovation Solution
A signal-processing device that detects a failed wheel signal and generates a substitute signal using unaffected wheel sensors, feeding it to the ABS unit to maintain system functionality, including split μ detection and plausibility checking, and adjusts brake pressure calculations to ensure stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant wheel sensor systems are configured to prevent ABS deactivation, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a signal-processing device as an intermediary that detects wheel signal failures and generates substitute signals using data from unaffected wheels. This mediator component allows the ABS system to continue functioning with a single sensor per wheel, eliminating the need for redundant sensors while maintaining reliability through active compensation of signal failures.
Solution Approach 2:
The signal-processing device creates substitute signals that copy or approximate the information that would be provided by a failed wheel sensor. By generating these substitute signals from data available from other wheels, the system maintains the appearance of having complete sensor input without actually requiring redundant physical sensors.
2Reliability
If wheel signal failure is detected and substitute signals are generated, then reliability is maintained, but device complexity increases due to signal-processing requirements
Solution Approach 1:
The signal-processing device performs multiple functions: it monitors wheel signals for failures, generates substitute signals when failures are detected, and provides these substitute signals to the ABS control unit. This multi-functional approach consolidates what would otherwise require separate systems into a single device, managing complexity while maintaining reliability.
3Reliability
If redundant sensor systems are implemented, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
Instead of investing in expensive redundant sensor hardware, the patent employs a software-based solution using inexpensive signal processing algorithms. The substitute signals are generated computationally from available data, replacing the need for costly duplicate sensor systems while achieving the same reliability objective.
Data Source
AI summary
A method and device for a vehicle having wheels which are each assigned a sensor for generating wheel signals. The unit determines whether a wheel is affected by a failure of the corresponding wheel signal. The unit acquires wheel signals which are assigned to the wheels, and for a wheel affected by a wheel signal failure, the corresponding wheel signal is acquired in the form of a substitute signal. The unit calculates a target brake pressure for a wheel at which an increase in brake pressure is necessary. The increase in brake pressure takes place in accordance with the wheel signal which is obtained for the wheel and in accordance with the determination as to whether the wheel is affected by a wheel signal failure. The unit further determines a slip threshold for an anti-lock brake control operation applied to the wheel affected by the wheel signal failure.