Detachable Throughflow Measuring Unit for High-Pressure Injector Testing
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Solution Overview
Problem
Existing testing devices for high-pressure injectors in common rail injection systems are limited in diagnosing malfunctions and evaluating cleaning efficiency due to spatial constraints and inefficiencies in measuring fuel return quantities, particularly for engines with laterally arranged connections and varying operational requirements.
Innovation Solution
A detachable throughflow quantity measuring/display unit with flexible hose units allows for easy connection between the fuel return connection and line, enabling reliable measurement and display of fuel return flow, facilitating diagnosis and evaluation of cleaning processes across various engine configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a test tube is used to measure fuel return quantity, then the fuel return quantity can be measured, but the testing device cannot be used in engines with laterally arranged connections or in spaces with insufficient upward space
Solution Approach 1:
The testing device incorporates multiple connection elements with different connection types (first connection element for one configuration, second connection element for another configuration) to accommodate various injector connection types. This universal design allows the same device to be used across different engine configurations without requiring multiple specialized tools.
Solution Approach 2:
The device uses detachable connection elements as intermediaries between the fuel return line and the measuring container. These connection elements can be selected and attached based on the specific injector type, enabling compatibility while maintaining ease of connection through standardized attachment mechanisms.
2Quantity of substance
If a large volume test tube is used to accommodate 1-3 minutes of fuel return at idle, then sufficient fuel capacity is available for testing, but the device becomes more complex and less adaptable to restricted spaces
Solution Approach 1:
The measuring container is designed as a detachable component that can be separated from the connection elements. This segmentation allows the measuring container to be removed after use, significantly reducing the volume occupied by the testing device during storage and transport, while still providing sufficient capacity during the actual measurement process.
Solution Approach 2:
The testing device transitions from a compact state (connection elements only) to an expanded state (connection elements plus measuring container attached) during operation. The measuring container can be attached when needed for measurement and removed afterward, allowing the device to adapt its volume dynamically based on operational requirements.
3Shape
If the fuel return line connection is arranged laterally on the nozzle, then the injector design is compact, but the known test tube cannot be plugged on in a simple manner
Solution Approach 1:
The connection elements are designed with asymmetric features that match the lateral arrangement of the fuel return line. The first and second connection elements have different geometries optimized for different connection configurations, allowing proper alignment and connection despite the lateral positioning of the fuel return line on the nozzle.
Data Source
AI summary
A testing device (10) for high-pressure injectors (50) of a common rail injection system of an engine unit, with the high-pressure injectors (50) each having a fuel return connection (52) for a fuel return line (54) is characterized by a throughflow quantity measuring/display unit (12) which can be detachably connected between the fuel return connection (52) and fuel return line (54).