Heat Storage Cover for Engine Intake Air Temperature Control
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Solution Overview
Problem
The introduction of outside air to cool a combustion chamber in an engine can lead to decreased temperature, compromising combustion stability, especially during lean combustion modes where a large amount of air is required.
Innovation Solution
A heat storage cover is used to warm air around the engine, which is then accumulated and introduced into the intake passage, blocking upward heat dissipation and maintaining high temperatures. This high-temperature air is directed into the combustion chamber, preventing temperature drops and ensuring stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outside air is introduced into the combustion chamber, then combustion stability is improved through sufficient oxygen supply, but the combustion chamber temperature decreases due to cooling effect
Solution Approach 1:
The heat storage cover pre-heats the air before it enters the combustion chamber by storing heat from the engine during operation. This preliminary heating action ensures that even when large amounts of air are introduced for lean combustion, the air arrives at the combustion chamber at an elevated temperature, preventing temperature drops and maintaining combustion stability.
Solution Approach 2:
The heat storage cover acts as an intermediary component between the engine and the intake air system. It captures and stores heat from the engine, then transfers this heat to the air passing through or near it, effectively mediating the temperature of the air before it reaches the combustion chamber.
2Temperature
If a cover member is provided to keep the engine warm, then engine temperature is maintained, but the combustion chamber is still cooled by outside air introduction
Solution Approach 1:
The heat storage cover performs preliminary heating of the intake air by storing engine heat and transferring it to the air stream. This ensures that the air entering the combustion chamber is pre-warmed, preventing the cooling effect that would otherwise occur when outside air is introduced, thus maintaining combustion stability even while the engine remains covered.
Solution Approach 2:
The heat storage cover creates a localized heated zone for the intake air specifically, while the rest of the engine remains covered for overall temperature maintenance. This local quality approach heats only the air that needs to enter the combustion chamber, addressing the specific problem of combustion chamber cooling without affecting the overall engine thermal management.
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
The solution effectively maintains combustion chamber temperature, enhancing engine stability even during lean combustion conditions by utilizing the heat storage cover to warm and reintroduce high-temperature air into the engine.
Implementation Method 1
the heat dissipated from the engine is stored inside the heat storage cover through the medium of air, and the upward heat dissipation is blocked by the heat storage cover
Implementation Method 2
air around the engine is warmed by the heat dissipated from the engine and rises
Implementation Method 3
the radiator serves to prevent the heat dissipation from the engine, and waste heat released from the radiator (heat taken from the cooling water by heat exchange) is supplied to the engine side
Data Source
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AI summary
A heat storage cover 21 is provided in an engine room. The heat storage cover 21 covers an engine 2 from above and surrounds the periphery of an upper portion of the engine 2 to internally store, through the medium of air, heat dissipated from the engine 2 and block upward heat dissipation. The engine 2 includes an air inlet 45 for introducing, into a combustion chamber, high temperature air obtained by the heat storage cover 21 blocking the upward heat dissipation.