Fuel Injection Valve Timing Correction via Electromotive Force
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Solution Overview
Problem
Current fuel injection control devices face challenges in accurately detecting valve closing timing in partial lift regions due to the limitations of existing detection methods, which can lead to increased variation in injection quantity and deteriorate exhaust emission and drivability.
Innovation Solution
A fuel injection control device that incorporates a correction unit to calculate a correction coefficient for improving the accuracy of valve closing timing detection using both electromotive force quantity detection and timing detection modes, allowing for improved detection accuracy and range without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electromotive force quantity detection mode is used to detect valve closing timing, then detection range is improved, but detection accuracy deteriorates
Solution Approach 1:
The patent introduces a correction coefficient as an intermediary element that mediates between the electromotive force quantity detection mode (wide detection range) and timing detection mode (high detection accuracy). The correction coefficient is calculated using the timing detection mode when applicable, then applied to correct the valve closing timing detected by the electromotive force quantity detection mode, thereby achieving both wide detection range and high detection accuracy.
2Measurement precision
If timing detection mode is used to detect valve closing timing, then detection accuracy is improved, but detection range deteriorates
Solution Approach 1:
The patent implements a dynamic detection mode selection mechanism that adapts between timing detection mode and electromotive force quantity detection mode based on operating conditions. The control unit determines which detection mode to use based on the injection command pulse width and other parameters, ensuring high detection accuracy when timing detection is applicable while maintaining wide detection range through electromotive force quantity detection in other conditions.
3Adaptability or versatility
If both detection modes are executed simultaneously, then both detection accuracy and detection range are improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by not always executing both detection modes simultaneously. Instead, it selectively uses timing detection mode when the injection command pulse width is within a specific range where timing detection is effective, and uses electromotive force quantity detection mode for other conditions. This selective approach achieves both high detection accuracy and wide detection range while avoiding the complexity of always executing both modes.
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 proposed solution enhances the detection accuracy of valve closing timing and estimated injection quantity, even in regions not detectable by traditional methods, thereby improving fuel injection control and reducing exhaust emissions and drivability issues.
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
Implementation Method 2
a magnetic attraction force is generated in the coil, a valve body of a fuel injection valve is driven to valve opening
Data Source
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AI summary
A fuel injection control device includes a correction unit (21) to calculate a correction coefficient for correcting a valve closing timing detected by an electromotive force quantity detection mode by using a valve closing timing detected by a timing detection mode. An estimation unit (21) estimates an estimated injection quantity by using a valve closing timing after corrected by using a correction coefficient when the electromotive force quantity detection mode is selected by a selection unit (21) and a valve closing timing is detected by the electromotive force quantity detection mode.