Unit Pump Control Valve Stability Testing Method
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Solution Overview
Problem
Existing methods for testing unit pump system performance fail to adequately mitigate environmental influences, such as temperature variations, leading to higher injection volume deviation measurements and increased measurement spreads, which hinder compliance with stringent emission regulations.
Innovation Solution
A method that involves setting up a test bench to determine and achieve mechanical and electrical stability of the control valve, including measuring fuel temperature for mechanical stability and electric current profiles for electrical stability, before conducting injection quantity measurements to ensure results fall within tolerated spread limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional test methods are used without considering environmental conditions, then the testing process is simple and quick, but the measurement precision deteriorates due to higher injection volume deviation and measurement spread
Solution Approach 1:
The patent applies preliminary action by implementing a stabilization period before measurements are taken. The test procedure includes waiting for a predetermined period (e.g., 15-30 minutes) after starting the test bench to allow mechanical and electrical components to reach stable operating conditions. This preliminary stabilization phase reduces temperature variations and component drift, thereby improving measurement precision without requiring complex real-time environmental control systems.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring environmental parameters (temperature, humidity) and injection volume deviations during the testing process. The system uses this feedback data to adjust testing procedures, such as extending stabilization periods or adjusting measurement timing, to ensure measurements are taken when components are in stable states. This feedback loop maintains high measurement precision while keeping the overall test procedure manageable.
2Reliability
If environmental conditions are not controlled, then the ease of operation is maintained, but the reliability deteriorates due to components performing differently under varying environmental conditions
Solution Approach 1:
The patent applies preliminary action by establishing standardized pre-test procedures that include environmental acclimatization periods and component stabilization steps. Before actual measurements begin, the system performs preliminary operations such as running the test bench at idle for a predetermined period to allow mechanical and electrical components (including control valves and sensors) to reach thermal and operational stability. This ensures reliable, consistent component performance across different environmental conditions while maintaining relatively simple test setup procedures.
3Measurement precision
If measurements are taken immediately without stabilization period, then the productivity is high, but the measurement precision deteriorates due to higher injection volume deviation
Solution Approach 1:
The patent applies preliminary action by implementing optimized stabilization periods that balance measurement precision requirements with productivity constraints. The predetermined waiting period (e.g., 15-30 minutes) is carefully calibrated to be the minimum time required for components to reach stable operating conditions. This optimized approach ensures sufficient stabilization for accurate injection volume measurements while minimizing the non-measurement time, thereby maintaining acceptable testing throughput.
Solution Approach 2:
The patent applies partial action by implementing selective stabilization strategies where not all components require the same stabilization time. The system identifies critical components (such as control valves and temperature-sensitive sensors) that require stabilization and focuses the waiting period on these elements, rather than requiring extended stabilization for the entire system. This partial stabilization approach achieves sufficient measurement precision without unnecessarily extending the overall test duration, thus preserving productivity.
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 approach provides more precise and stable performance evaluations, reducing injection volume deviation and enabling unit pump systems to meet emission standards by accounting for environmental effects on mechanical and electrical components.
Implementation Method 1
the control valve (42), which is an electromagnetic device, has a coil (421) and a magnetic core (422)
Implementation Method 2
measuring a fuel temperature of the unit pump system
Data Source
AI summary
A method of testing a unit pump system performance is disclosed. In one embodiment of the present disclosure, the method of testing a unit pump system performance determines if mechanical and/or electrical stability of a control valve of the unit pump system are achieved before measuring an output injection volume variation.