Redundant Sensor Channel Activation for Brake-By-Wire Reliability
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Solution Overview
Problem
Modern vehicle braking systems, particularly 'true brake-by-wire' systems, face challenges in reliably identifying faults and deducing driver braking commands without mechanical fallbacks, as sensor signals can be lost or overlaid, leading to inconsistent evaluations between control units, affecting the trustworthiness and quality of sensor information transmission.
Innovation Solution
A method and sensor system with redundant sensor channels and control units that determine quality values for each sensor channel, allowing for comparison and activation of the system based on these values, enabling reliable operation without hardware expansion, using a value matrix for quality assessment and actuator activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant sensor channels and control units are used, then reliability is improved, but device complexity increases
Solution Approach 1:
The system divides the sensor information processing into multiple independent sensor channels (first sensor channel, second sensor channel) that are distributed to different control units. Each channel processes sensor information independently, allowing the system to segment the redundant functionality across multiple components rather than concentrating it in a single complex unit.
Solution Approach 2:
The system performs preliminary quality assessment of sensor channels by determining quality values for each channel before final evaluation. This preliminary action of assessing sensor channel quality allows the system to identify and prioritize reliable channels in advance, reducing the complexity of real-time fault detection and decision-making.
2Measurement precision
If quality values are determined and compared for sensor channels, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system implements feedback by determining quality values for each sensor channel and using these quality values to evaluate and select the best channel for activation. The quality values provide continuous feedback about the state of each sensor channel, enabling the system to adaptively choose the most reliable channel based on current conditions rather than using fixed selection criteria.
Solution Approach 2:
The system changes the parameter of sensor channel selection from a static choice to a dynamic one based on quality values. By introducing quality values as a new parameter that can vary between channels and over time, the system enables more precise measurement and evaluation of sensor channel reliability, allowing the best channel to be selected based on actual performance rather than predetermined assignments.
Data Source
AI summary
A sensor system and method for activating the sensor system for transmitting at least one item of first sensor information from a first sensor channel to a first central processing unit and at least one item of second sensor information from a second sensor channel to a second central processing unit. At least one first quality value is determined relating to the functional quality of the first sensor channel at a first control unit on the basis of the first sensor information via the first central processing unit. At least one second quality value is determined relating to the functional quality of the second sensor channel at a second control unit on the basis of the second sensor information via the second central processing unit. A comparison is performed of the first quality value and the second quality value. The sensor system is activated based on the comparison.