Exhaust Component Diagnosis Through Reproduced Engine Operating States
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Solution Overview
Problem
Existing methods for monitoring and diagnosing exhaust components in internal combustion engines, such as catalytic converters and sensors, do not effectively ensure compliance with stringent emissions regulations like Euro 7, particularly with the introduction of on-board monitoring (OBM), as they lack robustness in detecting defects and validating functional capacity under real-world conditions.
Innovation Solution
A method involving the monitoring and recording of engine operating parameters during a driving cycle, storing parameters when emissions exceed thresholds, reproducing the operating state on a test bench, and using a portable emission measurement system (PEMS) to diagnose exhaust components by comparing current and reproduced measurements against predefined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing monitoring methods are used for exhaust components, then the monitoring can be performed during normal operation, but the diagnosis lacks robustness and cannot reliably detect defects under real-world conditions
Solution Approach 1:
The method stores operating parameters and emission threshold data before actual diagnosis is needed. By pre-recording the operating state when emission thresholds are exceeded, the system prepares reference data that enables reliable defect detection during subsequent test bench diagnoses, resolving the contradiction between operational monitoring and diagnostic robustness
Solution Approach 2:
The invention creates a copy of the actual operating state by storing operating parameters (engine speed, load, temperature, etc.) when emission thresholds are exceeded. This copied data is then used to reproduce identical operating conditions on the test bench, enabling accurate defect detection without needing to maintain the exact real-world conditions during diagnosis
2Measurement precision
If emission monitoring is performed continuously during driving cycles, then compliance with emissions regulations can be monitored, but the system cannot distinguish between actual component defects and variations in operating conditions
Solution Approach 1:
The method monitors multiple operating parameters (engine speed, load, temperature, air-fuel ratio) simultaneously and stores their values when emission thresholds are exceeded. By analyzing the combination of these parameters rather than emission values alone, the system can distinguish between emissions caused by actual defects versus those resulting from normal operating variations, improving measurement precision without significantly increasing system complexity
Solution Approach 2:
The stored operating parameters serve as an intermediary that links emission measurements to specific operating conditions. This intermediary data allows the system to compare emissions against the correct reference values for given operating states, enabling accurate defect detection while maintaining a relatively simple monitoring system architecture
3Productivity
If the exhaust component is diagnosed immediately during operation, then defects can be detected in real-time, but the diagnosis cannot be performed under controlled and reproducible conditions
Solution Approach 1:
The system performs preliminary data collection during normal operation by storing operating parameters when emission thresholds are exceeded. This preparation phase enables rapid reproduction of identical operating conditions on the test bench, achieving both fast diagnosis (productivity) and consistent, reproducible results (reliability) without requiring extended test periods
Data Source
AI summary
A method for diagnosing an exhaust component in an exhaust passage for an internal combustion engine of a vehicle. In the method, operating parameters of the internal combustion engine are monitored and recorded by a control unit while the internal combustion engine is running. If a predefined emission threshold for the exhaust component for compliance with emissions is found to have been exceeded, the current operating parameters of the internal combustion engine are stored in a control unit. The operating state of the internal combustion engine when the predefined emission threshold is exceeded is reproduced on a vehicle test bench using the stored operating parameters. The diagnosis of the exhaust component is carried out based on a comparison between the current measured value from the exhaust component and the current measured value from an emission measuring device and/or the predefined emission threshold.