Electromagnetic Valve Control via Inflection-Point Timing Detection
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Solution Overview
Problem
Existing methods for detecting the operating state of electromagnetic valves in internal combustion engines face challenges in precisely measuring inductance changes and are prone to noise interference, making it difficult to accurately control the valve opening and closing times.
Innovation Solution
An electromagnetic valve control unit that corrects the drive voltage or current based on the detection of inflection points from time series data of the drive voltage or current, allowing for precise detection of valve opening and closing times and appropriate control of the valve opening/closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If inductance measurement method is used to detect operating state changes, then detection capability is provided, but measurement precision deteriorates due to noise interference and difficulty in directly measuring inductance changes
Solution Approach 1:
The patent introduces an intermediary approach by measuring current or voltage values that reflect inductance changes indirectly, rather than attempting to measure inductance directly. The control unit detects inflection points in current or voltage waveforms, which serve as mediators to infer operating state changes. This intermediary measurement method avoids the noise and precision problems of direct inductance measurement while still providing detection capability.
Solution Approach 2:
The patent replaces the problematic inductance measurement system with an alternative electrical measurement system. Instead of measuring inductance (which suffers from noise and precision issues), the system measures current or voltage values and analyzes their temporal characteristics (inflection points). This substitution maintains detection functionality while eliminating measurement precision deterioration.
2Difficulty of detecting and measuring
If second-order differentiation is applied to current/voltage data to detect operating state changes, then detection capability is enhanced, but noise interference increases significantly
Solution Approach 1:
The patent extracts only the essential information needed for detection by identifying inflection points in current or voltage waveforms, rather than processing the entire waveform through noisy differentiation operations. This extraction approach isolates the critical transition moments (inflection points) that indicate operating state changes, eliminating the need for second-order differentiation and its associated noise amplification.
3Adaptability or versatility
If multiple current evaluation patterns are prepared to match different drive circuits, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent implements a universal detection method that works across different drive circuit configurations without requiring multiple specialized evaluation patterns. The inflection point detection approach in current or voltage waveforms is applicable regardless of the specific drive circuit type, providing multi-functionality and adaptability while maintaining a simple, unified detection algorithm rather than requiring multiple complex pattern libraries.
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 enables precise detection and correction of valve operation times, leading to improved control of fuel injection amounts and reduced variation in fuel injection, aligning with target injection amounts.
Implementation Method 1
a solenoid (3) surrounding a bobbin (3a)
Implementation Method 2
a method of detecting the change of the operating state of the electromagnetic actuator from inductance of a predetermined time
Data Source
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AI summary
Provided are an electromagnetic valve control unit and a fuel injection control device using the same that can precisely detect a change of an operating state of an electromagnetic valve, that is, a valve opening time or a valve closing time of the electromagnetic valve, precisely correct a drive voltage or a drive current applied to the electromagnetic valve, and appropriately control opening/closing of the electromagnetic valve, with a simple configuration. In an electromagnetic valve control unit for controlling opening/closing of an electromagnetic valve by a drive voltage and a drive current to be applied, the drive voltage and the drive current applied to the electromagnetic valve are corrected on the basis of a detection time of an inflection point from time series data of the drive voltage and the drive current when the electromagnetic valve is opened/closed.