Engine Control Unit Abnormality Detection via Injection Amount Comparison
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Solution Overview
Problem
Conventional engine control apparatuses fail to effectively monitor their own calculation functions for abnormalities, leading to potential erroneous detection of fuel injection issues due to timing deviations in sensor detection and update lag periods.
Innovation Solution
The engine control apparatus calculates both control and monitoring required injection amounts based on rotation speeds from the crank angle sensor at different timings, comparing these values within a predetermined lag period to determine abnormalities, thereby avoiding erroneous detection and ensuring precise monitoring of its own calculation function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control unit calculates control and monitoring required injection amounts using sensor detection results at different timings, then the monitoring function can detect abnormalities in the calculation function, but timing deviations cause update lag periods that lead to erroneous abnormality detection
Solution Approach 1:
The control unit determines whether the calculation function is abnormal before comparing the control and monitoring required injection amounts. This preliminary determination step prevents erroneous abnormality detection by checking the validity of the comparison data before performing the comparison, thus resolving the contradiction between detecting calculation function abnormalities and avoiding false positives due to timing deviations
Solution Approach 2:
The control unit dynamically adjusts the monitoring strategy by determining abnormality status based on the relationship between control and monitoring required injection amounts before performing the actual comparison. This dynamic approach allows the system to adapt to timing deviations and update lag periods, maintaining measurement precision while preserving the ability to detect true abnormalities
2Reliability
If the control unit compares control and monitoring required injection amounts to detect calculation function abnormalities, then monitoring capability is improved, but timing differences between updates cause false abnormality detection
Solution Approach 1:
The control unit performs a preliminary determination of abnormality status by comparing control and monitoring required injection amounts before using these values for actual comparison. This preliminary action filters out erroneous data caused by timing deviations and update lag periods, thereby preventing false positive detection while maintaining effective monitoring of the calculation function
Solution Approach 2:
The control unit converts the harmful effect of timing deviations and update lag periods into a beneficial filtering mechanism. By using the preliminary comparison result as a validity check, the system transforms potential sources of false positives into a protective mechanism that enhances the reliability of abnormality detection
Data Source
AI summary
A control apparatus for an engine includes a control unit. The engine includes a sensor. The control unit determines whether or not an abnormality has occurred in a calculation function of the control unit on the basis of a comparison result between the control required injection amount and the monitoring required injection amount. The control unit determines whether or not an abnormality has occurred in the calculation function of the control unit without using the comparison result when the comparison result is calculated during a predetermined period. The predetermined period is a period of a delay that occurs between updating of one of respective values of the control rotation speed and the monitoring rotation speed and updating of the other value due to a difference between the first timing and the second timing.