Brake System Control Unit Air Gap Monitoring
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Solution Overview
Problem
Existing vehicle brake systems face challenges in accurately monitoring the air gap between an active rotational speed sensor and a pole wheel, leading to potential sensor displacement and failure due to vibrations, which can result in safety issues during vehicle operation.
Innovation Solution
A control unit with a receiver circuit to process digital signals from the active rotational speed sensor, a comparator circuit to detect deviations in the air gap, and an information circuit to generate pre-warning or fault information, allowing for early detection and prevention of sensor slipping or failure, thereby ensuring the correct position of the rotational speed sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an active rotational speed sensor is arranged in an immovable fashion, then the air gap can be monitored with simple binary distinction, but the monitoring resolution is insufficient for early detection of sensor displacement
Solution Approach 1:
The patent changes the parameter of air gap measurement from binary (acceptable/unacceptable) to multi-level digitized values (e.g., 4-bit or higher resolution). This allows the control unit to detect gradual sensor displacement through multiple intermediate states, enabling early warning before complete sensor failure occurs.
Solution Approach 2:
The system performs preliminary detection of air gap deviations by monitoring digitized air gap values before the sensor displacement becomes critical. The control unit can generate early warning signals when the air gap approaches tolerance limits, allowing preventive maintenance before actual sensor failure.
2Ease of manufacture
If the rotational speed sensor is allowed to be displaced axially in the drilled hole, then installation is easier, but the sensor may assume an unacceptably large distance from the pole wheel
Solution Approach 1:
The patent implements feedback by continuously monitoring the air gap between the sensor and pole wheel through digitized measurements. The control unit receives air gap values from the sensor and can generate warning signals when displacement exceeds acceptable limits, providing feedback on sensor position stability during operation.
Solution Approach 2:
The patent replaces mechanical constraints (fixed sensor positioning) with electronic monitoring (digitized air gap measurement and control). Instead of relying solely on mechanical fixation, the system uses electronic detection of air gap changes to monitor and alert on sensor displacement, substituting mechanical reliability with electronic surveillance.
3Reliability
If only binary distinction is made between acceptable and unacceptable air gap, then the monitoring system remains simple, but early detection of sensor slipping is not possible
Solution Approach 1:
The patent changes the evaluation parameter from binary (acceptable/unacceptable) to multi-level digitized air gap values. This allows the control unit to detect gradual sensor displacement through multiple intermediate states, enabling early warning before complete sensor failure occurs.
Solution Approach 2:
The system performs preliminary detection of air gap deviations by monitoring digitized air gap values before the sensor displacement becomes critical. The control unit can generate early warning signals when the air gap approaches tolerance limits, allowing preventive maintenance before actual sensor failure.
Data Source
AI summary
A control unit of a vehicle brake system has a receive circuit for tapping and processing a digital signal provided by an active speed sensor for speed measurement on a vehicle wheel. The signal includes information concerning the speed of a pole wheel, which is arranged in front of the sensor, spaced therefrom by an air gap, and which rotates along with the wheel. The signal also includes an actual air gap value digitized in stages and comprising several bits. The control unit also has a comparator circuit for comparing the actual air gap value to a reference air gap value and for determining whether the actual air gap value exceeds the reference value by more than a defined tolerance value. An information circuit of the control circuit generates early warning information when the comparator circuit determines that the actual air gap value exceeds the reference value by more than the tolerance value.