Fuel Injection Fault Localization via Pressure Gradient Analysis
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Solution Overview
Problem
Existing onboard diagnostic systems for fuel injection systems in internal combustion engines have limited ability to precisely locate faults, often leading to unnecessary component replacement and potential damage during manual diagnostic tests, and are unable to differentiate between high and low pressure area issues.
Innovation Solution
A method involving a test routine that monitors and evaluates the pressure changes in the fuel injection system by measuring and analyzing the instantaneous and average gradients of fuel pressure changes during pressure increase and decrease, allowing for the precise localization of faults within either the high or low pressure system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors and manual tests are attached to the fuel injection system for diagnostic purposes, then the ability to detect faults is improved, but the outlay on analytical equipment and risk of component damage increases
Solution Approach 1:
The fuel injection system performs self-diagnosis by utilizing its own existing sensors and control units to monitor pressure changes and detect faults, eliminating the need for additional external diagnostic equipment and manual tests while maintaining high fault detection capability
Solution Approach 2:
The patent replaces manual mechanical diagnostic tests with an automated electronic monitoring system that uses pressure sensors and control units to automatically detect faults, reducing the need for physical intervention and specialized analytical equipment
2Measurement precision
If manual tests are performed in the high pressure system, then fault detection capability is improved, but the risk of introducing contaminants or damaging components increases
Solution Approach 1:
The system performs autonomous fault detection by monitoring pressure changes through existing sensors without requiring manual intervention, thereby eliminating the risk of contaminating the high pressure system or damaging components during diagnostic procedures
Solution Approach 2:
The patent uses pressure sensors and control units as intermediaries to detect faults remotely through electrical signals, avoiding direct manual contact with the high pressure fuel system and thus preventing contaminant introduction and component damage
3Ease of operation
If existing onboard diagnostic systems are used, then the system is simple to operate, but the ability to precisely locate faults and differentiate between high and low pressure area issues is limited
Solution Approach 1:
The patent divides the fuel injection system into distinct high pressure and low pressure zones with separate monitoring strategies, using pressure sensors positioned in different locations to independently detect and localize faults in each zone, thereby achieving precise fault differentiation while maintaining system simplicity
Solution Approach 2:
The patent adds a spatial dimension to fault detection by monitoring pressure changes at multiple locations and analyzing the propagation patterns, enabling precise localization of faults within the injection system while using only standard onboard diagnostic capabilities
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
This method enables effective localization of faults within the fuel injection system, reducing unnecessary component replacement and allowing for targeted further analysis and repair, while ensuring that functional components are not replaced in error.
Implementation Method 1
Ep=f(PSys, T, fuel quality)
Data Source
AI summary
A method is provided for detecting a malfunction in an electronically regulated fuel injection system of an internal combustion engine, by which effective limitation of the cause of the fault in a fuel injection system can take place. For example, it can be determined whether the cause of the fault lies in the low pressure system or in the high pressure system of the fuel injection system.