Fuel Injector Interface Device for In-Situ Diagnostic Testing
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Solution Overview
Problem
The transition to gasoline direct injection systems has increased the frequency of fuel system problems, requiring costly and time-consuming individual bench testing of fuel injectors, which is inconvenient for vehicle owners.
Innovation Solution
A fuel injector interface device with input and output leads connected to the vehicle's fuel injection system and a display device, using circuitry to detect rail pressure signals and output data for graphical representation, allowing technicians to identify anomalies in fuel injectors without removing them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual bench testing of fuel injectors is performed, then measurement precision is improved, but loss of time and productivity deteriorate
Solution Approach 1:
The patent introduces an interface device as an intermediary between the fuel rail and individual fuel injectors. This device includes pressure sensors that detect pressure changes in the fuel rail caused by injector operation, allowing non-intrusive monitoring of injector functionality without removing injectors from the vehicle, thus eliminating bench testing time while maintaining diagnostic accuracy
Solution Approach 2:
The patent replaces the mechanical bench testing system with an electronic sensing system. Instead of physically removing and mechanically testing injectors on a bench, the system uses electronic pressure sensors to detect pressure variations in the fuel rail that correspond to injector operation, substituting mechanical testing with electronic measurement
2Measurement precision
If all injectors are removed for bench testing, then measurement precision is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The interface device serves as an intermediary that remains installed in the fuel rail, eliminating the need to remove injectors. The device includes pressure sensors and signal processing circuitry that monitor injector operation in-situ, making the testing procedure as simple as connecting diagnostic equipment to the vehicle without disassembling the fuel injection system
Solution Approach 2:
The system allows the fuel injection system to test itself by monitoring pressure changes naturally occurring during normal injector operation. The pressure sensors detect pressure drops when injectors open and pressure recoveries when they close, enabling self-diagnosis without requiring removal or external bench testing equipment
3Reliability
If traditional bench testing is used, then reliability of injector diagnosis is improved, but productivity and loss of time deteriorate
Solution Approach 1:
The patent enables continuous monitoring of fuel injector operation during normal vehicle operation or engine running conditions. The pressure sensors continuously detect pressure changes in the fuel rail, allowing real-time diagnosis without interrupting vehicle use, thereby maintaining diagnostic reliability while maximizing vehicle productivity and minimizing service time
Solution Approach 2:
The patent replaces time-consuming mechanical bench testing with rapid electronic pressure sensing and signal analysis. The system processes pressure sensor signals to identify injector anomalies such as stuck injectors, leaking injectors, or improper spray patterns, achieving reliable diagnosis in real-time without the delays inherent in mechanical removal and bench testing procedures
Data Source
AI summary
A fuel injector interface device and associated method include an interface device having a plurality of input leads and a plurality of output leads. The input leads are communicatively linked to the fuel pressure sensor on the common rail of a vehicle fuel injection system. The output leads are communicatively linked to a display device such as a diagnostic scope. Circuitry positioned within the interface device detects the rail pressure signals, filters the signals, and outputs data to the display device representing a graphical depiction of the same. A method of using the interface device includes generating the signals, mapping the signals to an individual fuel injector of the vehicle's engine cylinder and determining fluctuations in the strength of the displayed signals to determine anomalies in a particular fuel injector.