Port Fuel Injection Timing for Vaporization and Valve Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine control devices face challenges in promoting fuel vaporization before ignition while protecting the fuel injection valve from heat damage due to exposure to high-temperature exhaust gas.
Innovation Solution
The engine control device adjusts the timing of the intake and exhaust valves and incorporates a dual fuel injection system, where the main fuel injection valve injects fuel after the exhaust stroke and before the intake valve opens, and the auxiliary fuel injection valve injects directly into the cylinder during the compression stroke, optimizing fuel vaporization and reducing heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fuel injection valve is disposed in the intake port to promote fuel vaporization, then fuel vaporization is improved, but the fuel injection valve is exposed to high-temperature exhaust gas causing heat damage
Solution Approach 1:
The fuel injection valve injects fuel into the intake port during the exhaust stroke or before the intake stroke, allowing fuel vaporization to occur in advance. This preliminary injection timing enables the fuel to vaporize before entering the cylinder, improving combustion efficiency while reducing the temperature exposure of the injection valve to high-temperature exhaust gases.
2Quantity of substance
If the intake valve opens early to allow more air-fuel mixture into the cylinder, then the air-fuel mixture quantity is improved, but the fuel injection valve is exposed to high-temperature exhaust gas for a longer period
Solution Approach 1:
The system dynamically adjusts the opening and closing timing of the intake and exhaust valves, as well as the fuel injection timing, to optimize the balance between air-fuel mixture quantity and fuel injection valve temperature exposure. By coordinating these timing parameters, the system ensures sufficient air-fuel mixture intake while minimizing the duration of high-temperature exposure to the fuel injection valve.
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 enhances fuel vaporization before ignition, mitigates heat damage to the fuel injection valve, and maintains a suitable temperature in the intake pipe for efficient combustion, improving engine performance compared to previous technologies.
Implementation Method 1
exhaust gas supplying means for recirculating an exhaust gas into any intake port other than at least one of the plurality of intake ports for each exhaust stroke
Implementation Method 2
the fuel injection valve is caused to inject the fuel in a period which is: after a piston starts to rise which had been passed through a bottom dead center for the first time after an exhaust stroke is finished
Data Source
AI summary
Provided is an engine control device which controls at least an intake valve, an exhaust valve, and a fuel injection valve injecting a fuel into an intake pipe such that internal EGR is realized, in which timing of opening and closing of the intake valve is set to be later in comparison with a reference operation state which is a first operation state and timing of closing of the exhaust valve is set to be earlier in comparison with the reference operation state, and the fuel injection valve is caused to inject the fuel in a period which is: after a piston starts to rise which had been passed through a bottom dead center for the first time after an exhaust stroke is finished, which is followed by closing of the intake valve; and before the intake valve is opened.