Internal Combustion Engine Cylinder Defect Detection via Angular Speed Analysis
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Solution Overview
Problem
Existing fault analysis devices for internal combustion engines cannot accurately identify defective cylinders, as they do not account for deviations in ignition times and rely on incorrect assumptions about cylinder defects.
Innovation Solution
A fault analysis method and device that determine cylinder defects by analyzing parameters such as injection time and quantity, using angular speed data to equalize engine intervals and calculate injection quantities, identifying defects based on parameter limits and maintaining constant engine rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing fault analysis devices use ignition times to detect cylinder defects, then the detection method is simple, but the detection accuracy is poor because ignition times do not directly reflect cylinder mechanical defects
Solution Approach 1:
The patent replaces the electrical ignition time measurement with mechanical parameter measurements (injection timing, injection quantity, angular speed) that directly reflect the mechanical state of each cylinder. This substitution allows direct detection of mechanical defects such as piston ring wear, valve issues, and injection system problems, significantly improving detection accuracy while maintaining reasonable system complexity through parameter calculation from existing sensors.
2Measurement precision
If no additional sensors are added to the engine system, then the device complexity remains low, but the ability to accurately identify defective cylinders is limited
Solution Approach 1:
The patent segments the engine analysis into individual cylinder evaluations by calculating specific parameters for each cylinder (injection timing deviations, injection quantity variations, angular speed contributions). This segmentation enables identification of defective cylinders through comparative analysis of cylinder-specific parameters, achieving accurate defect localization without requiring additional physical sensors in each cylinder.
Solution Approach 2:
The patent introduces calculated parameters as intermediaries between the existing sensor data and cylinder defect identification. By computing injection timing deviations, injection quantities, and angular speed contributions as intermediate values, the system extracts cylinder-specific information from global engine measurements, enabling accurate defect detection without direct cylinder sensors.
3Productivity
If cylinder equalization regulation is used to adapt combustion parameters, then engine performance is optimized, but the fault analysis becomes more complex due to parameter interdependencies
Solution Approach 1:
The patent performs preliminary calculation and storage of cylinder-specific parameters (injection timing, injection quantity, angular speed contributions) before fault analysis. By pre-processing the data and establishing baseline values during normal operation, the system simplifies the fault detection process by having ready-to-compare reference values, reducing the complexity of real-time fault analysis despite the presence of cylinder equalization regulation.
Data Source
AI summary
In a fault analysis method for an internal combustion engine having a plurality of cylinders, an angular speed of the internal combustion engine is determined, and one parameter of the combustion process of one of the plurality of cylinders (6) is adapted in order to equalize the times taken by the internal combustion engine to cover in each case one angle interval. To provide a fault analysis method which makes it possible to detect a defective cylinder (6), it is determined that one of the plurality of cylinders (6) is defective on the basis of the value of the parameter.