Non-invasive Gas Needle Valve Testing via Eddy Current and Pressure Sensors
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Solution Overview
Problem
Current testing methods for the injection law and needle valve lift of high-pressure direct injection natural gas engines are invasive, costly, and unable to achieve simultaneous testing of dynamic characteristics and injection law in the same time and space.
Innovation Solution
A non-invasive device and method for simultaneous testing of dynamic characteristics and injection law of a gas needle valve, utilizing an eddy current displacement sensor, pressure sensor, temperature sensor, and a constant volume sealed container to measure needle valve lift and injection law simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive testing methods are used to measure needle valve lift and injection law, then measurement precision can be improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a constant volume sealed container as an intermediary medium between the injector and measurement system. This container allows non-invasive measurement of injection law through pressure changes, while the eddy current displacement sensor measures needle valve lift externally. The intermediary container enables accurate measurement without direct intrusion into the injector's internal structure, thus maintaining measurement precision while reducing device complexity and cost.
Solution Approach 2:
The patent replaces invasive mechanical measurement methods with non-invasive sensing technologies. Specifically, it uses eddy current displacement sensors to measure needle valve lift without physical contact, and pressure sensors within the constant volume container to determine injection law through pressure changes. This substitution eliminates the need for complex mechanical intrusion into the injector, reducing device complexity while maintaining measurement accuracy.
2Measurement precision
If separate testing methods are used for needle valve lift and injection law, then measurement precision for each parameter can be maintained, but loss of time increases due to sequential testing
Solution Approach 1:
The patent merges the measurement of needle valve lift and injection law into a single integrated testing system. The eddy current displacement sensor and pressure sensor operate simultaneously within the same constant volume sealed container, allowing both parameters to be measured at the same time. This combining of measurement functions eliminates sequential testing, significantly reducing testing time while maintaining the measurement precision of both parameters through their respective dedicated sensors.
Solution Approach 2:
The constant volume sealed container serves multiple functions simultaneously: it provides a controlled environment for pressure measurement, houses the eddy current displacement sensor for needle valve lift measurement, and enables both measurements to occur in the same spatial and temporal context. This multi-functionality allows the system to measure both needle valve lift and injection law with equal precision without requiring separate testing procedures, thereby eliminating time loss.
3Measurement precision
If the injector structure is modified for testing purposes, then measurement precision can be improved, but ease of manufacture decreases
Solution Approach 1:
The patent uses a constant volume sealed container as an intermediary testing environment that does not require modification of the injector's internal structure. The container provides a controlled space where pressure changes can be accurately measured to determine injection law, while the eddy current displacement sensor measures needle valve lift externally. This approach maintains the injector's original manufacturing simplicity while achieving high measurement precision through non-invasive sensing.
Solution Approach 2:
The patent replaces mechanical modification of the injector with non-invasive sensing technologies. Instead of cutting, drilling, or otherwise altering the injector structure to install measurement devices, the system uses eddy current displacement sensors for contactless needle valve lift measurement and pressure sensors in the constant volume container for injection law determination. This substitution preserves the injector's ease of manufacture while achieving accurate measurements.
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
Enables non-invasive, cost-effective, and simultaneous testing of needle valve lift and injection law, providing accurate data for optimizing injector performance without altering the internal structure of the injector.
Implementation Method 1
an eddy current displacement sensor, arranged at a lower part of a gas needle valve of the tested injector
Implementation Method 2
The pressure sensor and the temperature sensor are inserted into the constant volume cavity
Implementation Method 3
The pressure sensor and the temperature sensor are inserted into the constant volume cavity
Data Source
AI summary
A non-invasive device for simultaneous testing dynamic characteristics and injection law of a gas needle valve and a method therefor are disclosed. The device includes a tested injector, a pressure sensor, a temperature sensor, an eddy current displacement sensor, a constant volume sealed container, and a controller. A nozzle of the tested injector is inserted into a constant volume cavity of the constant volume sealed container; the eddy current displacement sensor is arranged at a lower part of a gas needle valve of the tested injector; the pressure sensor and the temperature sensor are inserted into the constant volume cavity; and the controller is configured to receive displacement data, pressure data, and temperature data, and calculate the injection law of the tested injector based on the pressure data and the temperature data, achieving multi parameters testing of the needle valve lift and injection law in the same time and space.