Injector Control Device for Suppressing Pressure Reduction Boiling
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Solution Overview
Problem
In-cylinder injection type engines face issues with pressure reduction boiling, leading to smaller particle sizes and increased fuel adhesion to injector tips, which reduces penetration force and tumble flow, especially when fuel temperature is high and combustion chamber pressure is low.
Innovation Solution
A vehicle control device that adjusts the lift amount of the injector's valve body to increase the injection velocity and reduce fuel adhesion by narrowing the injection angle when the fuel temperature is high and combustion chamber pressure is low, using a control unit to manage the injector's operation based on temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fuel injection pressure is lowered to suppress pressure reduction boiling, then fuel adhesion is reduced, but penetration force decreases and spray particle size becomes too small
Solution Approach 1:
The invention changes the injection parameters by increasing injection pressure and adjusting valve lift amount based on detected fuel temperature and combustion chamber pressure conditions. When pressure reduction boiling is detected (high fuel temperature and low combustion chamber pressure), the control unit increases injection pressure to maintain penetration force while managing fuel adhesion through controlled vaporization.
Solution Approach 2:
The invention dynamically adjusts the valve lift amount based on real-time detection of fuel temperature and combustion chamber pressure. The valve lift is increased when pressure reduction boiling conditions are detected, allowing dynamic optimization of injection characteristics to balance penetration force and fuel adhesion suppression.
2Temperature
If fuel temperature is high and combustion chamber pressure is low, then pressure reduction boiling occurs and fuel vaporizes rapidly, but spray particle size becomes smaller and penetration force decreases
Solution Approach 1:
The control unit detects fuel temperature and combustion chamber pressure conditions, and when pressure reduction boiling is detected, it changes injection parameters including increasing injection pressure and adjusting valve lift amount to maintain appropriate spray characteristics despite high temperature and low pressure conditions.
Solution Approach 2:
The invention uses a detection unit to monitor fuel temperature and combustion chamber pressure, providing feedback to the control unit. Based on this feedback, the control unit adjusts injection parameters in real-time to prevent the adverse effects of pressure reduction boiling while maintaining proper spray penetration.
3Force
If valve lift amount is increased to maintain penetration force, then spray spread increases, but fuel adhesion to injector tip increases
Solution Approach 1:
The invention optimizes the valve lift amount based on detected operating conditions. When pressure reduction boiling is detected, the control unit adjusts the valve lift amount to a predetermined value that balances penetration force maintenance with reduction of fuel adhesion, rather than simply maximizing valve lift.
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
Effectively suppresses pressure reduction boiling, reducing fuel adhesion to injector tips and enhancing penetration force and tumble flow in the combustion chamber.
Implementation Method 1
a phenomenon called pressure reduction boiling tends to occur and the fuel is rapidly vaporized
Implementation Method 2
pressure reduction boiling occurs when the temperature of the fuel is high and pressure in the combustion chamber is low
Data Source
AI summary
An object of the present invention is to provide a control device of an injector capable of suppressing the influence of pressure reduction boiling even if pressure in a combustion chamber is low. In a case where the temperature of fuel injected from a fuel injection valve is within a set high temperature region and the pressure of the combustion chamber is within a set low pressure region, the control device of an in-cylinder direct injection-type injector according to the present invention controls to increase a lift amount of the injector as compared to the case of a low temperature region or a high pressure region.