Vehicle Data Transmission Error Prioritization
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Solution Overview
Problem
Existing methods for transmitting wheel speed sensor data in vehicles face challenges in identifying and handling errors, particularly at high speeds, due to bandwidth constraints and computationally intensive algorithms, which can compromise safety by delaying error recognition.
Innovation Solution
A method that prioritizes error information in the data transmission signal, using an ascending chronological order and distinct error qualification and quantification areas, ensures timely error detection and classification, even under bandwidth limitations, by transmitting critical error information first and utilizing a protocol that distinguishes between ASIL-relevant and non-relevant errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error information and evaluation information are transmitted in addition to measured values, then error detection capability is improved, but bandwidth consumption increases
Solution Approach 1:
The data transmission is segmented into priority levels: measured values, error information, and evaluation information. This segmentation allows the system to transmit only essential error detection data when bandwidth is limited, while optionally transmitting additional evaluation information when bandwidth is available.
Solution Approach 2:
The system transmits partial error information (basic error flags) in all cases to maintain reliable error detection, and only transmits excessive detailed evaluation information when bandwidth conditions permit, thus balancing reliability requirements with bandwidth constraints.
2Speed
If periodic intervals between measured values are reduced to increase transmission frequency, then response time is improved, but available bandwidth for error information decreases
Solution Approach 1:
Different data elements are assigned different priority levels. Measured values and basic error information are transmitted with high priority to ensure fast response, while detailed evaluation information is transmitted with lower priority, allowing the system to maintain fast response times even when bandwidth is constrained by frequent measurement intervals.
3Measurement precision
If computationally intensive algorithms are used for error detection, then measurement precision is improved, but processing time increases
Solution Approach 1:
Error detection is segmented into two stages: a fast first stage that transmits basic error flags with measured values, and a slower second stage that transmits detailed evaluation information. This allows the system to achieve high measurement precision through comprehensive algorithms while maintaining fast initial error detection and response.
Data Source
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AI summary
The invention relates to a method for transmitting a measured value (12, 50) in a data transmission signal (40), said method comprising: introduction of the measured value (12, 50) into the data transmission signal (40); introduction of error information (52) after said measured value (12, 50) into the data transmission signal (40), from which information it can be deduced whether the measured value (12, 50) contains an error; and introduction of evaluation information (54 to 68) which describes the error information (52) into the data transmission signal (40) after the error information (52), if the measured value (12, 50) contains an error.