Fuel Injector Valve Detection Noise Reduction
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Solution Overview
Problem
Existing methods for detecting valve movement in fuel injectors with closely positioned solenoids suffer from noise and cross-talk, impairing the accuracy of valve position detection.
Innovation Solution
A method involving the application of a first chopped current to close a spill valve, followed by a control valve current to open and then close a control valve, and switching to a second non-chopped current to maintain the spill valve closed, allowing for the detection of the control valve's closing timing with reduced cross-talk potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If solenoids are positioned in close proximity to satisfy size constraints, then the injector size is reduced, but cross-talk and noise increase impairing valve movement detection accuracy
Solution Approach 1:
The system applies a preliminary current to the spill valve solenoid before activating the control valve solenoid. This preliminary action prepares the spill valve to remain closed during control valve operation, preventing fuel pressure fluctuations that would otherwise generate noise and cross-talk signals during the critical detection period when the control valve closes.
Solution Approach 2:
The system changes the electrical current parameter by applying a sustained preliminary current to the spill valve solenoid, maintaining it in a closed state. This parameter change (current application state) prevents mechanical movements in the spill valve that would create electromagnetic interference, thereby improving the signal-to-noise ratio for valve movement detection without requiring increased physical separation between solenoids.
2Device complexity
If traditional valve detection methods are used with closely-positioned solenoids, then the system structure is simple, but detection accuracy is impaired due to cross-talk
Solution Approach 1:
The control system performs a preliminary action by activating the spill valve solenoid before the control valve solenoid. This sequential operation ensures the spill valve is already closed and stable when the control valve operates, eliminating a major source of detection noise without adding complex hardware. The solution maintains structural simplicity while improving detection accuracy through intelligent control sequencing.
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 enhances the accuracy of valve position detection, reducing noise and improving the precision of fuel injection timing, leading to better engine performance and reduced emissions.
Implementation Method 1
the control unit may detect movement of a valve member based on free-wheeling current generated in the solenoid (e.g., current induced by movement of a valve member returning to a resting position)
Data Source
AI summary
A fuel injection method includes applying a first method current to close a spill valve according to a first method, applying a control valve current to open a control valve, and discontinuing the application of the control valve current to thereby cause the control valve to close. The method also includes applying a second method current to maintain the spill valve closed according to a second method and detecting a timing of a closing of the control valve while applying the second method current according to the second method, the second method being different than the first method.