Air-Intake Passage Water Jacket for Fuel Vaporization
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Solution Overview
Problem
In fuel injection engines, the cooling of the entire wall portion around the air-intake port impedes the vaporization of fuel adhering to the inner wall, leading to reduced fuel efficiency.
Innovation Solution
A fuel injection engine design where the water jacket extends away from the region where fuel is likely to adhere, allowing for controlled vaporization of the fuel while effectively cooling other areas of the air-intake passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the entire wall portion around the air-intake port is cooled, then the air cooling effect is improved, but the fuel vaporization is impeded
Solution Approach 1:
The water jacket is designed with non-uniform thickness to create different cooling intensities in different regions. The thinner portion is positioned away from the fuel injection area to provide strong cooling for air intake, while the thicker portion near the fuel injection area reduces cooling intensity to preserve fuel vaporization. This local differentiation resolves the contradiction between air cooling and fuel vaporization.
2Temperature
If the water jacket is positioned to cool the air-intake passage effectively, then air cooling is improved, but the fuel adhering to the inner wall cannot vaporize properly
Solution Approach 1:
The water jacket thickness is varied locally to match different functional requirements. Thinner walls are placed where air cooling is needed, while thicker walls are placed near the fuel injection area where fuel vaporization must be preserved. This spatial differentiation of cooling intensity resolves the contradiction between air cooling effectiveness and fuel vaporization rate.
3Productivity
If cooling water flows through the water jacket to cool the air-intake passage, then air filling efficiency is improved, but fuel efficiency is reduced due to impeded vaporization
Solution Approach 1:
The water jacket is designed with non-uniform thickness to provide location-specific cooling. The thinner portion allows intensive cooling for improved air filling efficiency, while the thicker portion near the fuel injection area limits cooling to preserve fuel vaporization and efficiency. This local quality differentiation resolves the contradiction between air filling efficiency and fuel efficiency.
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 design facilitates the vaporization of fuel adhering to the inner wall of the air-intake passage, improving fuel efficiency and ensuring effective cooling of the air supplied to the combustion chamber.
Implementation Method 1
a water jacket through which cooling water flows to cool the air-intake passage
Implementation Method 2
The fuel adhering to the inner wall is later vaporized into a gas
Data Source
AI summary
An air fuel injection engine including an air-intake passage configured to guide air taken in from outside to a combustion chamber formed by a cylinder block and a cylinder head, a fuel injector configured to inject fuel to an interior of the air-intake passage, and a water jacket through which cooling water flows to cool the air-intake passage. As viewed in a plane crossing an air flow direction in the air-intake passage and passing through a predetermined region of an inner wall of the air-intake passage, the predetermined region including a crossing point at which a fuel injection center line of the fuel injected from the fuel injector crosses the inner wall of the air-intake passage, the water jacket is configured to extend away from the crossing point along a circumferential direction of the air-intake passage, from a region near the predetermined region.