Injector Control Device Valve Timing Correction

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Solution Overview

Problem

Existing injector control methods struggle to precisely control small gasoline injection amounts due to individual variations in injectors, such as production variations and temperature changes, leading to variations in fuel injection amounts.

Innovation Solution

An injector control device that calculates and adjusts the current supply period to the solenoid based on learned characteristic data, including valve opening and closing delay periods, to achieve a target fuel injection amount, thereby reducing variations caused by individual injector differences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the drive period of the injector is decreased to reduce the injection amount for one time, then the gasoline injection amount per injection is reduced, but it becomes difficult to precisely control the small injection amount

Engineering Contradiction:

Improvegasoline injection amount per injectionVSAvoidcontrol precision of injection amount

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The system detects the actual valve closing time point by calculating the second-order derivative of the solenoid terminal voltage waveform and identifies the maximum value point. This feedback mechanism allows precise determination of the actual injection timing and duration, enabling accurate control of small injection amounts even when the drive period is reduced.

Inventive Principle:

Principle #23Feedback

2Quantity of substance

If the current supply period to the solenoid is controlled based on target fuel injection amount, then the fuel injection amount can be adjusted, but variation occurs due to individual difference of the injector

Engineering Contradiction:

Improvefuel injection amountVSAvoidconsistency of fuel injection amount

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The system performs self-learning by detecting the actual valve closing time point during operation and automatically correcting the current supply period based on the detected value. This self-adjustment mechanism compensates for individual differences in each injector, ensuring consistent fuel injection amounts across different injectors without requiring manual calibration.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system replaces mechanical trial-and-adjustment methods with an electrical detection and calculation system. By using voltage waveform analysis and second-order derivative calculation, the system electronically determines the actual valve closing time and automatically adjusts control parameters, eliminating the need for manual mechanical adjustment and reducing variations due to individual injector differences.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of time

If the valve closing time point is detected to correct the current supply period, then the injection timing can be adjusted, but the method does not correct for individual variation of the injector

Engineering Contradiction:

Improveinjection timing accuracyVSAvoidcorrection of individual injector variation

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

Inventive Principle:

Principle #25Self-service

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 control device effectively decreases fuel injection amount variations by learning and adapting to individual injector characteristics, improving the precision and accuracy of fuel injection.

Implementation Method 1

a solenoid configured to attract the needle valve in a valve opening direction when a current is supplied to the solenoid

Methodology Applied

Scientific EffectMagnetic field generation: Electromagnet

Data Source

PatentUS10393052B2Injector control device and injector control method

Publication Date: 2019.08.27 MITSUBISHI ELECTRIC CORP

AI summary

A target injector valve opening period is calculated based on a target fuel injection amount, and an injector (2) is controlled by a current supply control unit (51) in accordance with an injector drive period acquired based on the target injector valve opening period. An actual valve closing delay period is calculated based on a drive waveform of the injector (2) at this time, and a difference between an actual valve closing delay period and a valve closing delay period calculated from a target injector valve opening period is learned. Then, the injector drive period is corrected by feedback control using a result of this learning.