Compensated Engine Fault Detection for Multiple Rotational Irregularities
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Solution Overview
Problem
Existing methods for determining multiple rotational irregularities in internal combustion engines are unreliable, as they fail to accurately localize faults in multiple cylinders that occur simultaneously, leading to costly and iterative troubleshooting processes.
Innovation Solution
A computer-assisted method that calculates compensation factors to isolate the uneven running values of each combustion chamber, allowing for robust diagnosis of multiple rotational irregularities by eliminating the influence of one combustion chamber's irregularity on the next, using a predefined calculation rule and encoder wheel data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the typical determination method using encoder wheel and segment times is used, then simple faults caused by individual combustion chambers can be reliably determined, but multiple rotational irregularities cannot be robustly detected due to alternating influence of uneven running values on each other
Solution Approach 1:
The method segments the evaluation of uneven running values by introducing a compensation factor that isolates each combustion chamber's contribution. The compensated uneven running value is calculated by compensating the current combustion chamber's uneven running value with the previously determined compensation factor, thereby segmenting the interdependent measurements into independent evaluatable units.
Solution Approach 2:
The compensation factor acts as an intermediary element that mediates between the interdependent uneven running values of consecutive combustion chambers. By introducing this intermediate compensation value, the method eliminates the direct alternating influence between adjacent chambers, allowing independent assessment of each chamber's rotational irregularity.
2Ease of manufacture
If multiple rotational irregularities occur simultaneously in cylinders that do not fire successively, then the existing method cannot determine the faults, leading to costly and iterative troubleshooting processes
Solution Approach 1:
The method implements feedback by using the previously determined compensation factor (derived from earlier combustion chamber evaluations) to compensate the current combustion chamber's uneven running value. This feedback mechanism allows the system to account for and eliminate the influence of previously detected irregularities, enabling accurate identification of multiple simultaneous faults regardless of ignition sequence.
Data Source
AI summary
Multiple rotational irregularities in an internal combustion engine are determined. An uneven running value of a currently-ignited combustion chamber in a logical ignition sequence of a plurality of combustion chambers immediately after a logically-preceding ignited combustion chamber is determined. The uneven running value determined for the logically-preceding ignited combustion chamber exceeds a specified threshold value and indicates a fault in the logically-preceding ignited combustion chamber. A compensation factor is determined that. A compensated uneven running value of the currently-ignited combustion chamber from the uneven running value of the currently-ignited combustion chamber and the compensation factor is determined. The compensated uneven running value of the currently-ignited combustion chamber is compared with the specified threshold value to determine whether the currently-ignited combustion chamber has a fault.