Wheel Speed Sensor Dual-Resolution Circuit for Failure Detection
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Solution Overview
Problem
Existing wheel speed sensors lack effective mechanisms to determine their functional state accurately, which can impact the reliability of systems relying on their data.
Innovation Solution
A control circuit and electrical control unit that utilize high-resolution and low-resolution data to compare and check for consistency, allowing determination of the sensor's functional state, and trigger safety mechanisms or resets if inconsistencies are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crosscheck mechanism is implemented to determine sensor functional state, then reliability is improved, but device complexity increases
Solution Approach 1:
The sensor system performs self-diagnostics by comparing its own high-resolution and low-resolution measurement channels. The control circuit automatically detects inconsistencies between the two measurement paths and triggers safety mechanisms without external intervention, allowing the system to monitor its own functional state.
Solution Approach 2:
The measurement process is divided into two independent resolution channels (high-resolution and low-resolution). By segmenting the measurement function into parallel paths with different resolutions, the system can compare results from each path to detect functional deviations, improving reliability through redundancy.
2Measurement precision
If high-resolution and low-resolution data are compared for consistency checks, then measurement precision is improved, but loss of time increases due to additional processing
Solution Approach 1:
Both high-resolution and low-resolution measurements are taken simultaneously and stored for later comparison. The consistency check is performed as a preliminary safety verification before critical decisions are made, allowing the system to prepare diagnostic information in advance without interrupting normal operation.
Solution Approach 2:
The consistency check implementation uses efficient digital signal processing and bitwise operations to compare measurement data. By replacing complex analytical methods with streamlined computational algorithms, the system minimizes processing time while maintaining accurate functional state detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the reliability of wheel speed sensors by quickly identifying malfunctions and enabling rapid transitions to failsafe operations, improving safety in automotive systems.
Implementation Method 1
Wheel speed sensors may, for example, comprise Hall elements to detect the change of the magnetic field. The Hall elements generate an alternating voltage signal while the wheel is in rotation.
Data Source
AI summary
A control circuit for a wheel speed sensor is provide. The control circuit includes an input interface configured to receive high-resolution wheel speed data and low-resolution wheel speed data; and circuitry configured to determine information on a functional state of the wheel speed sensor using the high-resolution data and the low-resolution data. The circuitry is configured to detect a failure state of the wheel speed sensor if a number of signal events which are signaled by the high-resolution wheel speed data between a first signal event and a second signal event deviates from an expected number. The first signal event and the second signal event are signaled by the low-resolution wheel speed data.