Fuel Injector Test Fixture With Interchangeable Adaptors
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Solution Overview
Problem
Existing testing apparatuses are not suitable for both diesel and gasoline fuel injectors due to differences in injector assembly and pressure requirements, making it difficult to test both types using the same equipment.
Innovation Solution
A versatile testing apparatus with interchangeable inlet and outlet adaptors, a removable target assembly for visual inspection, and a damper device to stabilize fluid pressure, allowing for the testing of both gasoline and diesel fuel injectors with the same apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a testing apparatus is designed for diesel fuel injectors with high pressure (200-2000 bar), then it can accurately test diesel injectors, but it cannot be used for gasoline fuel injectors which require much lower pressure (3-200 bar)
Solution Approach 1:
The testing apparatus is designed with a universal base structure that can accommodate both diesel and gasoline injectors by using interchangeable adaptors. The upper and lower mounts are configured to receive different adaptor types, allowing the same apparatus to function for testing both high-pressure diesel injectors and low-pressure gasoline injectors without requiring separate dedicated equipment for each injector type.
Solution Approach 2:
The testing apparatus is divided into modular components including an upper mount, a lower mount, and interchangeable inlet/outlet adaptors. This segmentation allows the adaptors to be easily removed and replaced depending on the injector type being tested, providing flexibility while maintaining a stable core testing structure.
2Adaptability or versatility
If separate testing equipment is used for diesel and gasoline injectors, then each injector type can be tested with optimized equipment, but the cost and complexity of maintaining multiple apparatus increases
Solution Approach 1:
A single testing apparatus is designed to perform the function of multiple specialized apparatus by incorporating interchangeable adaptors for different injector types, eliminating the need to purchase and maintain separate equipment for diesel and gasoline injector testing.
Solution Approach 2:
The apparatus combines the testing capabilities for both diesel and gasoline injectors into one unified system by integrating interchangeable adaptor components that can be swapped based on the injector type, merging what would traditionally require two separate equipment sets into one versatile unit.
3Measurement precision
If spray pattern measurement is performed only by visual inspection, then the apparatus structure remains simple, but the measurement accuracy and completeness of spray characteristics is insufficient
Solution Approach 1:
A target plate is introduced as an intermediary element between the fuel injector and the observer/measurement system. The target plate captures the spray pattern visually, allowing for more accurate and complete measurement of spray characteristics including spray angle, symmetry, and distribution patterns, while keeping the overall apparatus structure relatively simple.
4Adaptability or versatility
If adaptors are made removable and interchangeable, then the apparatus can accommodate different injector types, but the setup time and operational complexity increases
Solution Approach 1:
The adaptor system is segmented into distinct, self-contained inlet and outlet adaptor components that can be independently removed and replaced. This segmentation allows for quick changes without requiring disassembly of the entire testing apparatus, reducing the time penalty associated with switching between different injector types.
Data Source
AI summary
A testing apparatus for a fuel injector includes an upper mount for receiving an inlet of the fuel injector; a lower mount located beneath the upper mount for receiving a nozzle end of the fuel injector; and at least one of a removable inlet adaptor and a removeable outlet adapter. The inlet of the fuel injector fits into the inlet adaptor to allow a flow of fluid to be delivered through the inlet adaptor to the fuel injector and removable from the upper mount. The removable outlet adaptor removable from the lower mount.