Fuel Injection Control Valve Closing Timing 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 limitations of both induced electromotive force quantity detection and timing detection modes, leading to potential deterioration in exhaust emission and drivability.
Innovation Solution
A fuel injection control device that includes a valve closing detection unit capable of executing either electromotive force quantity detection or timing detection modes, with a selection unit that chooses the appropriate mode based on the requested injection quantity, selecting timing detection for larger quantities and electromotive force quantity detection for smaller quantities to ensure both detection accuracy and range without increasing the control device's processing capabilities.
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 (cannot detect when lift quantity is small)
Solution Approach 1:
The system dynamically switches between timing detection mode and electromotive force quantity detection mode based on the detected lift quantity. When lift quantity is large, timing detection mode is used for high accuracy; when lift quantity is small, electromotive force quantity detection mode is used to ensure detection capability, thus adapting to different operating conditions.
Solution Approach 2:
The detection method changes based on the parameter of lift quantity. When lift quantity exceeds a threshold, timing detection is applied; when it falls below the threshold, electromotive force quantity detection is applied. This parameter-based switching resolves the contradiction between accuracy and detection range.
2Adaptability or versatility
If electromotive force quantity detection is used for valve closing detection, then detection range is improved, but detection accuracy is reduced
Solution Approach 1:
The system dynamically selects the detection mode based on operating conditions (lift quantity). Electromotive force quantity detection is used when lift quantity is small to ensure detection range, while timing detection is used when lift quantity is large to maximize accuracy.
Solution Approach 2:
The detection approach is changed based on the lift quantity parameter. The system transitions between detection methods depending on whether the lift quantity is above or below a threshold, optimizing both detection range and accuracy for different operating conditions.
3Measurement precision
If both detection modes are implemented simultaneously, then both detection accuracy and detection range are improved, but device complexity increases
Solution Approach 1:
The detection function is segmented into two distinct modes (timing detection and electromotive force quantity detection) that are executed selectively rather than simultaneously. The control device divides the detection task based on operating conditions, reducing the processing burden while maintaining both accuracy and detection range capabilities.
Solution Approach 2:
Instead of implementing both detection modes continuously, the system dynamically activates only the necessary detection mode based on the current operating condition (lift quantity). This dynamic activation reduces processing capabilities requirements while maintaining the benefits of both detection methods when needed.
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 allows for accurate detection of valve closing timing in both full and partial lift regions, enhancing the control device's ability to correct injection command pulses and maintain optimal engine performance while preventing the need for increased processing capabilities.
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 valve closing detection unit (54) to detect a valve closing timing by using either of an electromotive force quantity detection mode and an timing detection mode and 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 the selection unit: selects the timing detection mode when a requested injection quantity is larger than a prescribed reference injection quantity in partial lift injection; and selects the electromotive force quantity detection mode when the requested injection quantity is smaller than the reference injection quantity.