Wheel Speed Sensor Wiring Interference Mitigation
Solution Overview
Problem
Integration of wheel speed sensors and brake pad wear sensors can cause signal interference due to shared wiring, leading to degraded signal quality and random changes in the wheel speed sensor signal.
Innovation Solution
Connecting the brake pad wear sensor signal line with the wheel speed sensor power line to minimize interference, allowing the electronic control unit to monitor both signals without disrupting the wheel speed sensor's signal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wheel speed sensor and brake pad wear sensor are integrated on a common wiring harness with a common signal path, then cost and weight are reduced and installation is simplified, but signal interference occurs and signal quality degrades
Solution Approach 1:
The patent segments the wiring harness into separate signal paths: the wheel speed sensor uses a dedicated signal line while the brake pad wear sensor uses a separate path through the power line. This segmentation prevents signal interference while maintaining the integrated design benefits, resolving the contradiction between simplified wiring and signal quality.
2Loss of time
If the brake pad wear sensor is connected to a common signal line with the wheel speed sensor, then routing components are reduced and installation time is shortened, but the open loop acts as an antenna and degrades signal quality
Solution Approach 1:
The patent uses the power line as an intermediary medium to transmit the brake pad wear sensor signal separately from the wheel speed sensor signal line. This intermediary approach allows both sensors to be integrated without direct signal path interference, eliminating the antenna effect while maintaining installation efficiency.
3Reliability
If intermittent contacts occur between open ends on the open loop, then random and rapid changes in the wheel speed sensor signal occur, but separate wiring increases system complexity
Solution Approach 1:
The patent merges the brake pad wear sensor connection into the existing power line infrastructure rather than creating a completely separate wiring system. This combining approach maintains signal stability by preventing intermittent contacts while avoiding the complexity of entirely separate wiring harnesses for both sensors.
Data Source
AI summary
An integrated monitoring system for a vehicle including a brake pad wear sensor and a wheel speed sensor. A wheel speed sensor signal line is connected between the wheel speed sensor and an electronic control unit. A wheel speed power line is connected between the wheel speed sensor, the brake pad wear sensor, and the electronic control unit. The electronic control unit is configured to monitor the wheel speed sensor signal line for a signal indicative of a wheel speed and monitors the wheel speed power line for a signal indicative of a brake pad condition.