Particulate Matter Filter Failure Detection via Engine Load Thresholding
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Solution Overview
Problem
Existing particulate matter filter failure detection systems face challenges in accurately detecting filter failures, especially under varying engine loads and low intake airflow conditions, leading to delayed or incorrect detection of particulate matter filter failures.
Innovation Solution
A failure detection device and method that incorporates a particulate matter detection sensor, load detection, and a judgment execution determination part to compare engine load with a threshold value, ensuring accurate failure detection by only initiating the detection process when the load is sufficient, and comparing sensor output signals with a failure judgment threshold value to determine filter failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the failure detection device performs detection continuously regardless of engine load, then the detection coverage is improved, but the detection accuracy deteriorates under low load conditions
Solution Approach 1:
The detection execution determination part dynamically adjusts the detection process based on real-time engine load conditions. When engine load is high, failure detection is executed; when engine load is low, detection is suspended. This dynamic adaptation resolves the contradiction by making detection accuracy the priority under low load conditions while maintaining detection coverage under high load conditions.
2Measurement precision
If the failure detection is performed only when engine load is high, then the detection accuracy is improved, but the detection timeliness deteriorates
Solution Approach 1:
The judgment execution determination part continuously monitors engine load conditions and provides feedback to control the timing of failure detection execution. This feedback mechanism ensures that detection is performed at the most appropriate moments (high load conditions) while minimizing unnecessary detections during low load periods, thus balancing accuracy and timeliness.
3Speed
If the detection process is initiated under all conditions, then the response speed is improved, but the detection reliability deteriorates due to insufficient particulate matter accumulation
Solution Approach 1:
The system changes the operational parameter (detection execution) based on engine load conditions. By requiring high engine load before initiating detection, the system ensures sufficient particulate matter accumulation in the exhaust gas, which improves detection reliability. This parameter change resolves the contradiction by sacrificing some response speed under low load conditions to ensure reliable detection when detection is actually executed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables quick and accurate detection of particulate matter filter failures, reducing detection errors and ensuring timely alerts, even under conditions of varying engine loads and low airflow, thereby improving the reliability of particulate matter filter failure detection.
Implementation Method 1
the PM detection sensor has a sensor element of an electrical resistance type (as a PM detection type) in which a pair of electrodes are arranged on a surface of an insulating substrate. When particulate matter is collected and accumulated on the surface of the insulating substrate of the sensor element, a current starts to flow between the pair of electrodes formed on the surface of the insulating substrate.
Data Source
AI summary
A failure detection device has a PM filter, a PM detection sensor having a sensor element arranged at a downstream of the PM filter, an ECU and a PM detection sensor control part. The sensor element detects an amount of PM in exhaust gas, and generates a sensor signal corresponding to the detected PM amount. A load detection part in the ECU detects an engine load. A judgment execution determination part in the control part compares the detected engine load with a threshold value, and determines whether a PM filter failure detection should be performed based on the comparison result. A failure judgment part compares the sensor signal with a failure judgment threshold value when the determination part decides that it is necessary to perform the failure detection of the PM filter, and determines that the PM filter failure has occurred based on the latter comparison result.