Engine Cylinder Injection Error Diagnosis via Air/Fuel Ratio Adjustment
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Solution Overview
Problem
Existing methods for diagnosing injection quantity errors in internal combustion engines are susceptible to interferences such as poor road conditions, rotational speed changes, and acceleration, leading to inefficiencies in detection and correction.
Innovation Solution
A method that uses a characteristic curve linking changes in uneven running to injection quantity errors, allowing for rapid and accurate diagnosis by adjusting air/fuel ratios and utilizing pre-enrichment to improve precision, while also adapting correction values based on real-time data and engine operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing diagnostic methods are used to detect injection quantity errors, then detection capability is provided, but the detection process is susceptible to interferences from poor road conditions, rotational speed changes, and acceleration
Solution Approach 1:
The system performs preliminary characterization by storing reference uneven running values during normal operation before diagnostic mode. This preliminary data collection enables later comparison during diagnosis to distinguish true injection errors from interference-induced variations, thereby improving detection reliability while reducing susceptibility to interferences.
Solution Approach 2:
The diagnostic system dynamically adapts by switching between normal operation mode and diagnostic mode based on operating conditions. It dynamically adjusts the air/fuel ratio during diagnosis and compares against dynamically stored reference values, allowing the system to maintain reliability while accounting for varying operational interferences.
2Measurement precision
If traditional diagnostic procedures are implemented, then injection quantity errors can be detected, but the detection time is extended and efficiency is reduced
Solution Approach 1:
The system implements periodic diagnostic cycles where the control unit switches between normal operation and diagnostic mode in structured intervals. During diagnostic mode, it systematically varies air/fuel ratios and measures uneven running changes. This periodic approach maintains detection accuracy while limiting time loss by confining detailed measurements to specific periodic intervals rather than continuous operation.
Solution Approach 2:
Reference uneven running values are pre-stored during normal operation before diagnostic needs arise. This preliminary characterization allows rapid comparison during diagnostic mode without requiring lengthy baseline measurements each time, thus maintaining precision while reducing diagnostic time.
3Loss of information
If the air/fuel ratio is adjusted to diagnose injection quantity errors, then diagnostic information is obtained, but the engine operation deviates from optimal performance
Solution Approach 1:
Air/fuel ratio adjustments for diagnosis occur periodically in dedicated diagnostic modes rather than continuously. The system switches to diagnostic mode, performs necessary ratio adjustments to gather comprehensive diagnostic information, then returns to normal optimal operation. This periodic approach ensures complete information gathering while minimizing energy loss and performance deviation to specific time intervals.
Data Source
AI summary
In a method for operating an internal combustion engine having multiple cylinders, a cylinder to be checked is diagnosed for an injection quantity error. During a normal operation, a first air/fuel ratio is predefined for the multiple cylinders, and a first uneven running is ascertained. During an adjustment operation, a second air/fuel ratio for the cylinder to be checked is predefined during a number of working cycles. During the adjustment operation, a second uneven running is ascertained. The injection quantity error is ascertained for the cylinder to be checked as a function of the first uneven running and the second uneven running.