Engine Controller Sensor Diagnostic Timing
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Solution Overview
Problem
The existing diagnostic processes for sensors in internal combustion engines face accuracy issues due to shortened execution times when the increasing process for intake air amount is executed concurrently with sensor diagnostic processes, leading to insufficient time for accurate anomaly detection.
Innovation Solution
A controller configuration that prohibits the increasing process for intake air amount during sensor diagnostic processes, allowing the cumulated intake air amount to reach a specified threshold value, thereby extending the diagnostic period and enhancing the accuracy of sensor anomaly detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the increasing process for intake air amount is executed concurrently with the sensor diagnostic process, then the productivity of the engine operation is improved, but the measurement precision of the sensor diagnostic process deteriorates due to shortened execution time
Solution Approach 1:
The controller determines whether to execute the increasing process before starting the sensor diagnostic process. By预先判断 and setting the maximum execution period based on the cumulated intake air amount threshold, the system ensures that the diagnostic process has sufficient time to complete accurately without being interrupted by the increasing process.
Solution Approach 2:
The execution period of the sensor diagnostic process is dynamically adjusted based on the cumulated intake air amount. The controller calculates the maximum execution period as the time required for the cumulated intake air amount to reach a specified threshold, thereby adapting the diagnostic duration to actual engine operating conditions while ensuring sufficient diagnostic time.
2Loss of time
If the execution period of the sensor diagnostic process is shortened, then the loss of time in engine operation is reduced, but the measurement precision of the sensor diagnostic process deteriorates
Solution Approach 1:
The controller changes the parameter of diagnostic execution time based on the cumulated intake air amount. By setting the maximum execution period to the time required for the cumulated intake air amount to reach a specified threshold, the system optimizes the balance between diagnostic time and detection accuracy, ensuring that the diagnostic process completes with sufficient time while adapting to varying engine operating conditions.
Data Source
AI summary
A controller for an internal combustion engine is provided. A control circuit performs active control for an air-fuel ratio of exhaust gas. During execution of the active control, an increasing process for increasing an intake air amount is executed. During execution of the active control, a cumulated intake air amount is calculated. A sensor detects the air-fuel ratio. It is determined whether an anomaly has occurred in the sensor during execution of the active control. A maximum execution period of a sensor diagnostic process is set to a period for the cumulated intake air amount to reach a specified threshold value. The increasing process is prohibited during the execution of the sensor diagnostic process.