Intake Port Cooling Valve for Rapid Air Temperature Control
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Solution Overview
Problem
Internal combustion engines face a delay in responding to changes in requested intake air temperature due to the time required to adjust cooling water temperature, affecting combustion efficiency and engine performance.
Innovation Solution
An internal combustion engine design featuring a low-temperature and high-temperature cooling water circulation system, with an airflow control valve that adjusts the ratio of intake air flow through cooled and non-cooled sections of the intake port, and a tumble control valve to dynamically control intake air cooling based on operating regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling water temperature is adjusted to change intake air temperature, then intake air temperature can be controlled, but response delay occurs due to the time required to adjust cooling water temperature
Solution Approach 1:
The intake port is divided into a first wall surface covered by a water jacket and a second wall surface not covered by the water jacket. This segmentation allows different portions of the intake air to be cooled to different degrees, enabling rapid adjustment of intake air temperature without the delay associated with adjusting cooling water temperature throughout the entire system.
Solution Approach 2:
The water jacket is provided to cover only a specific portion (first wall surface) of the intake port, creating localized cooling zones. This local quality approach allows precise control over which portions of the intake air are cooled, enabling faster response to temperature requirements without the inertia of cooling the entire cooling water system.
2Temperature
If cooling water circulation system is used to cool intake air, then intake air temperature can be reduced, but the system complexity increases with multiple cooling circuits
Solution Approach 1:
The cooling function is merged directly into the intake port structure by providing a water jacket that covers a portion of the intake port wall surface. This integration eliminates the need for separate, complex cooling circuits while achieving the same cooling effect, thereby reducing system complexity.
Solution Approach 2:
The water jacket serves multiple functions: it cools the intake air, and its presence or absence on different wall surfaces allows differential cooling control. This multi-functionality reduces the need for additional dedicated cooling systems for different intake air 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
This design allows for rapid adjustment of intake air temperature, improving combustion efficiency by preventing knocking and optimizing combustion state, while reducing fuel consumption and acceleration time.
Implementation Method 1
a water jacket covering at least one portion of a wall surface of an intake port... Intake air that flows along the side of the first wall surface is cooled by the water jacket
Data Source
AI summary
A low-temperature cooling water channel formed in the internal combustion engine includes a water jacket that covers at least one portion of a wall surface of an intake port. The intake port has a cooled wall surface that is covered by the water jacket, and a non-cooled wall surface that is not covered by the water jacket. An airflow control valve is provided on an intake-air upstream side of the cooled wall surface. The airflow control valve is configured to be capable of changing a ratio between a flow rate of intake air that flows along the side of the cooled wall surface and a flow rate of intake air that flows along the side of the non-cooled wall surface. The airflow control valve is preferably configured as a tumble control valve (TCV).