Fuel Injection Control Valve Closing Detection
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Solution Overview
Problem
Existing fuel injection control devices face challenges in accurately detecting the timing of valve closing in partial lift regions due to the limited detection range and accuracy of current methods, leading to variations in injection quantity and potential deterioration in exhaust emission and drivability.
Innovation Solution
A fuel injection control device that incorporates a valve closing detection unit capable of executing either electromotive force quantity detection or timing detection modes, with a selection unit to choose the appropriate mode based on the requested injection quantity, and a correction unit to calculate a correction coefficient for improving detection accuracy and range, thereby reducing the difference between estimated and requested injection quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing detection mode is used for valve closing detection, then detection accuracy is improved, but detection range is reduced
Solution Approach 1:
The system dynamically switches between timing detection mode and electromotive force quantity detection mode based on the detected valve closing timing and injection quantity. This dynamic adaptation allows the system to use the more accurate timing detection mode when conditions permit, while falling back to the electromotive force quantity detection mode when the valve closes too early or injection quantity is small, thus resolving the contradiction between detection accuracy and detection range.
2Adaptability or versatility
If electromotive force quantity detection mode is used, then detection range is improved, but detection accuracy is reduced
Solution Approach 1:
The control device introduces an intermediary correction mechanism that uses the detected valve closing timing to calculate a correction coefficient, which is then applied to adjust the injection command pulse width. This intermediary correction compensates for the lower accuracy of electromotive force quantity detection mode, allowing the system to maintain good detection accuracy across a wide detection range by combining the advantages of both detection modes.
3Measurement precision
If correction coefficient calculation is continuously performed, then injection quantity control accuracy is improved, but processing time increases
Solution Approach 1:
The system performs correction coefficient calculation periodically based on detected valve closing timings rather than continuously for every injection event. This periodic correction approach maintains injection quantity control accuracy by regularly updating the correction coefficient while reducing processing time and computational load compared to continuous calculation, thus resolving the contradiction between control accuracy and processing time.
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
The solution enables both high detection accuracy and range for valve closing timing, reducing injection quantity variations and improving engine performance by selectively using the electromotive force quantity detection mode for smaller injection quantities and the timing detection mode for larger ones, thus enhancing the control device's efficiency and reducing erroneous detection.
Implementation Method 1
an induced electromotive force is generated in a coil in proportion to the displacement of a valve body after an injection command pulse is turned off
Data Source
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AI summary
A fuel injection control device includes a valve closing detection unit (54) to detect a valve closing timing by using either of an electromotive force quantity detection mode and a timing detection mode, a selection unit (21) to select either of the electromotive force quantity detection mode and the timing detection mode for detecting the valve closing timing, and a correction unit (21) to calculate a correction coefficient for correcting a requested injection quantity so as to reduce the difference between an estimated injection quantity and the requested injection quantity, and the selection unit selects the electromotive force quantity detection mode regardless of the value of the requested injection quantity when the calculation of the correction coefficient is not completed.