Flash Boiling Suppression in Dual-Port Fuel Injection
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Solution Overview
Problem
Existing internal combustion engine technologies do not effectively address the increase in Particulate Number (PN) due to flash boiling, which occurs when fuel at high temperature and pressure is exposed to low pressure, causing instantaneous boiling and fuel vaporization, leading to increased PN values.
Innovation Solution
A control method that senses fuel temperature and intake pressure to determine if flash boiling conditions are met, and adjusts the injection amount ratio by decreasing the in-cylinder injection fuel injection valve's ratio and increasing the port injection fuel injection valve's ratio when flash boiling is detected, thereby reducing PN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the in-cylinder injection fuel injection valve injects fuel at high temperature and pressure, then the fuel injection efficiency is improved, but flash boiling occurs causing PN to increase
Solution Approach 1:
The control device changes the fuel injection parameters by switching between in-cylinder injection and port injection modes based on detected fuel temperature and pressure conditions. When flash boiling is detected (high fuel temperature and pressure differential), the system switches to port injection or reduces in-cylinder injection amount, thereby changing the injection parameters to prevent PN increase while maintaining fuel injection efficiency under normal conditions
Solution Approach 2:
The control device acts as an intermediary between the fuel injection system and the combustion chamber. It monitors fuel temperature and pressure conditions, and based on these readings, intelligently controls the injection amount ratio between the in-cylinder injection valve and port injection valve, preventing flash boiling-induced PN increase while maintaining efficient fuel delivery
2Object-generated harmful factors
If the injection amount ratio of the in-cylinder injection fuel injection valve is decreased to suppress PN, then flash boiling effects are reduced, but fuel injection efficiency may deteriorate
Solution Approach 1:
The system dynamically adjusts the injection amount ratio between in-cylinder injection and port injection based on real-time fuel temperature and pressure conditions. The control device continuously monitors these parameters and varies the injection strategy accordingly - using in-cylinder injection when conditions are favorable for efficiency, and switching to port injection or reducing in-cylinder injection when flash boiling risk is detected, thus achieving both PN suppression and maintained fuel injection efficiency
Solution Approach 2:
The control device changes the operational parameters of the fuel injection system by adjusting the injection amount ratios of different injection valves based on detected fuel temperature and pressure. This parameter adaptation allows the system to optimize between PN suppression and fuel injection efficiency under varying operating conditions
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 effectively minimizes PN by adjusting fuel injection ratios based on flash boiling conditions, improving PN suppression compared to traditional methods.
Implementation Method 1
when the fuel of the high temperature and the high pressure is exposed though the injection hole to the low pressure, the instantaneous boiling of the fuel, that is, 'flash boiling' is generated
Data Source
AI summary
A control method of an internal combustion engine including an in-cylinder injection fuel injection valve arranged to inject a fuel to a combustion chamber, and a port injection fuel injection valve arranged to inject the fuel to an intake port, the control method includes: sensing or estimating a fuel temperature at a tip end portion of the in-cylinder injection fuel injection valve; sensing an intake pressure; judging whether or not a flash boiling condition based on the fuel temperature and the intake pressure; setting the in-cylinder fuel injection valve to a default fuel injection valve; and injecting an entire or a part of the fuel from the port injection fuel injection valve by decreasing an injection amount ratio of the in-cylinder injection fuel injection valve when the flash boiling condition is satisfied.