Fuel Injection Valve Control Device Dynamic Peak Current Adjustment
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Solution Overview
Problem
Fuel injection valves in internal combustion engines face delays in opening and closing due to variable fuel pressure and pulsation, leading to inconsistent fuel injection, which affects engine performance.
Innovation Solution
A control device and method that dynamically adjust the peak current value of the exciting current to the fuel injection valve based on real-time fuel pressure and the amount of fuel discharged from the high-pressure fuel pump, ensuring timely opening and closing while minimizing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the peak current value is reduced to suppress delay in closing of the fuel injection valve, then the delay in closing is reduced, but the opening of the fuel injection valve may delay when fuel pressure increases due to pulsation
Solution Approach 1:
The patent applies dynamics by making the peak current value variable rather than fixed. The control device dynamically adjusts the peak current value based on real-time fuel pressure conditions and pulsation characteristics. When fuel pressure is low, a lower peak current value is used to reduce residual magnetic force and suppress closing delay. When fuel pressure increases due to pulsation, the peak current value is increased to ensure timely opening. This dynamic adjustment resolves the contradiction between suppressing closing delay and ensuring reliable opening under varying pressure conditions.
Solution Approach 2:
The patent changes the parameter of peak current value based on fuel pressure conditions and pulsation characteristics. By monitoring fuel pressure and detecting pulsation patterns, the control device adjusts the peak current value to optimal levels. This parameter change allows the system to suppress closing delay when pressure is low while maintaining sufficient opening force when pressure increases due to pulsation, thereby resolving the technical contradiction between these two opposing requirements.
2Reliability
If the peak current value is determined at a larger value to avoid delay in opening, then opening delay is avoided, but the delay in closing after end of energization cannot be sufficiently suppressed
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the peak current value based on actual fuel pressure conditions and pulsation characteristics rather than using a fixed large value. The control device detects fuel pressure pulsation and adjusts the peak current value accordingly - using larger values only when necessary to prevent opening delay, and smaller values when pulsation is minimal to suppress closing delay. This dynamic approach allows the system to achieve both timely opening and minimal closing delay under different operating conditions.
Solution Approach 2:
The patent changes the peak current value parameter based on detected fuel pressure and pulsation characteristics. By continuously monitoring fuel pressure and adjusting the peak current value to match actual conditions, the system avoids the need to use a consistently large peak current value. This parameter adjustment strategy enables the system to prevent opening delay when pressure pulsation occurs while suppressing closing delay when pressure is stable or low, thereby resolving the contradiction between these two performance requirements.
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 effectively prevents delays in fuel injection, maintaining consistent fuel delivery and improving engine performance by optimizing the electromagnetic force generated at the fuel injection valve.
Implementation Method 1
electromagnetic force that is generated at the fuel injection valve gradually increases with an increase in exciting current flowing through a solenoid of the fuel injection valve
Implementation Method 2
residual magnetic force after the end of energization of the fuel injection valve
Data Source
AI summary
A control device for a fuel injection valve includes a drive circuit that controls open/close operation of the fuel injection valve by passing an exciting current through a solenoid of the fuel injection valve and an ECU that reduces a peak current value as a fuel pressure in a delivery pipe at timing of a start of energization of the fuel injection valve decreases. The ECU reduces the peak current value as an amount of fuel discharged from a high-pressure fuel pump to the delivery pipe reduces.