Fuel Injection Fault Localization via Feature Comparison
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Solution Overview
Problem
Current fault localization methods for gasoline fuel injection systems are time-consuming and imprecise, as system error codes do not directly point to the defective component, requiring extensive analysis to identify and replace the causative component.
Innovation Solution
A method involving a series of tests that generate features, comparing them to predetermined combinations to precisely localize faults, including low-pressure and high-pressure tests, pressure measurements, and evaluation of pressure gradients to identify deviations and patterns associated with specific faults, allowing for accelerated and simplified fault analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If system error codes are stored in error memory for fault diagnosis, then fault information is captured, but the fault localization remains imprecise and time-consuming
Solution Approach 1:
The fault diagnosis process is segmented into multiple discrete test steps (first test step, second test step, third test step) that systematically isolate different components. Each test step generates specific features that are compared against predetermined combinations, breaking down the complex diagnosis into manageable segments that progressively narrow down the fault location.
Solution Approach 2:
Predetermined feature combinations are established in advance and stored in memory, allowing for rapid comparison with actual test results. The system performs preliminary setup by pre-defining what feature patterns correspond to specific faults, eliminating the need for complex real-time analysis and significantly reducing diagnosis time.
2Measurement precision
If multiple test steps are performed to generate features for fault identification, then fault localization precision is improved, but the complexity of the diagnostic process increases
Solution Approach 1:
The system changes operational parameters systematically through different test steps, varying pump operations, valve states, and measurement conditions to generate distinct feature patterns. By changing parameters in a controlled sequence and comparing results against predetermined combinations, the system achieves precise fault localization while maintaining a structured, manageable process complexity.
3Measurement precision
If pressure measurements and gradient evaluations are performed to minimize system tolerance influence, then measurement accuracy is improved, but the number of measurements and processing steps increases
Solution Approach 1:
The system replaces complex mechanical fault detection methods with electronic pressure sensing and computational analysis. By using electronic pressure sensors to continuously monitor pressure and its gradients, combined with computational comparison against predetermined feature combinations, the system achieves high measurement accuracy while maintaining fast diagnosis speed through automated electronic processing rather than manual mechanical inspection.
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
Enables precise and rapid fault localization in gasoline engine injection systems by generating and comparing features to identify faults effectively, simplifying the analysis process and minimizing the influence of system tolerances.
Implementation Method 1
measuring at least one pressure in the injection system and the features include the deviation of a measured pressure from a predetermined target value
Data Source
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AI summary
A method for localizing faults in a fuel injection system includes performing a plurality of tests, wherein each test generates one or more characteristics, and identifying a fault in the fuel injection system by comparing the characteristics with specified characteristic combinations. Each characteristic combination is assigned to a fault in the fuel injection system.