Wheel Speed Sensor Interface Circuit With Dual-Side Signal Verification
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Solution Overview
Problem
Existing wheel speed sensor interface circuits lack reliability and redundancy in transmitting wheel speed information, and there is a need for a cost-effective solution to enhance safety and reliability.
Innovation Solution
A wheel speed sensor interface circuit that compares voltage signals from both the high and low sides of the wheel speed sensor to verify normal operation, potentially omitting components connected to the low side to reduce costs while ensuring reliability and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage signals from both high side and low side of wheel speed sensor are sensed and compared to verify normal operation, then reliability and redundancy of wheel speed information transmission is improved, but device complexity and cost increase
Solution Approach 1:
The interface circuit performs preliminary verification by comparing voltage signals from high side and low side sensing paths before transmitting wheel speed information to the control device. This preliminary action detects potential failures in sensing paths, amplifiers, or communication lines, ensuring reliable information transmission while maintaining systematic simplicity.
Solution Approach 2:
The circuit implements feedback mechanism where the output signals from high side amplifier and low side amplifier are fed back to a comparison unit. The comparison unit continuously monitors whether these signals match expected patterns, providing feedback on the health of the sensing system and enabling reliable operation detection.
2Ease of manufacture
If components connected to low side of wheel speed sensor are omitted to reduce cost, then manufacturing cost is reduced, but reliability and redundancy are worsened
Solution Approach 1:
The patent merges the functions of high side sensing path and low side sensing path into a unified interface circuit that shares common components such as the wheel speed sensor itself, power supply, and ground connections. By strategically sharing components while maintaining separate sensing paths, the circuit achieves cost reduction through component consolidation while preserving reliability through redundant signal paths that can be verified against each other.
Data Source
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AI summary
The present disclosure provides a wheel speed sensor interface circuit, an operation method thereof, and an electronic control system, the wheel speed sensor interface circuit comprising: a first signal processing unit for receiving a first current signal sensed by a high side of a wheel speed sensor and processing the first current signal to output a first voltage signal; a second signal processing unit for receiving a second current signal sensed by a low side of the wheel speed sensor and processing the second current signal to output a second voltage signal; and a verification unit for comparing the first voltage signal and the second voltage signal with each other and verifying whether the first voltage signal and the second voltage signal are normal. According to the present disclosure, reliability and redundancy for a process of transmitting wheel speed information can be secured.