Intake Port Partition Wall Plate for Engine Tumble Flow Control
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Solution Overview
Problem
Existing engine technologies face challenges in generating a strong tumble flow in the combustion chamber to enhance thermal efficiency, as current techniques may not effectively manage intake air flow velocity and direction to optimize combustion efficiency.
Innovation Solution
The engine design incorporates a partition wall plate and a tumble valve that partition the intake port into multiple passages, with specific cross-sectional shapes and areas to control the flow velocity and direction of intake air, ensuring a strong tumble flow is generated by adjusting the passage areas and positions based on the engine load and air flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a partition wall plate is provided in the intake port to generate tumble flow, then thermal efficiency is improved, but the intake port structure becomes more complex
Solution Approach 1:
The partition wall plate is divided into multiple sections (first plate section, second plate section, third plate section) that are positioned at different locations within the intake port. Each section independently partitions the intake port to create multiple passages, enabling complex flow control without requiring a single large complex structure
Solution Approach 2:
Different sections of the partition wall plate have different cross-sectional shapes and positions tailored to their specific locations. The first plate section has a shape matching the first gap, the second plate section matches the second gap, and the third plate section is positioned to divide the common port section. This local optimization allows each section to efficiently control flow in its specific region while maintaining overall simplicity
2Loss of energy
If the partition wall plate cross-sectional shape is defined based on gap shape, then tumble flow generation is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The cross-sectional shapes of the partition wall plate sections are directly copied from the corresponding gap shapes between the intake valve head and the open end of the intake port. The first plate section's cross-section copies the first gap shape, the second plate section's cross-section copies the second gap shape, and so on. This copying approach ensures optimal tumble flow generation by matching the partition shape to the actual flow path geometry
Solution Approach 2:
The cross-sectional parameters of the partition wall plate are defined as functions of the gap parameters. By establishing a direct relationship between the gap dimensions and the partition wall plate dimensions, the design allows for systematic parameter adjustment based on valve lift and intake port geometry, optimizing tumble flow while maintaining manufacturability through parameterized design
3Speed
If multiple passages are created in the intake port, then flow velocity distribution is improved, but the intake valve control becomes more complex
Solution Approach 1:
The intake port is segmented into multiple passages by the partition wall plate sections, with each passage independently controlling flow to specific regions of the combustion chamber. The first passage, second passage, and third passage each have dedicated partition sections that can be independently designed and positioned
Solution Approach 2:
The partition wall plate structure serves multiple functions simultaneously: it divides the intake port into multiple passages, defines the flow direction for each passage, controls the flow velocity distribution, and generates tumble flow. This multi-functionality is achieved through the integrated design where each plate section performs several flow control functions in one component
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 effectively increases the flow velocity of intake air at the center of the combustion chamber, improving combustion efficiency and thermal efficiency of the engine by generating a strong tumble flow, even at low engine loads, while optimizing air supply at high loads.
Implementation Method 1
The partition wall plate adjusts a flow direction and a flow velocity of the intake air, whereby it is possible to generate a tumble flow in the combustion chamber
Data Source
AI summary
An engine includes a combustion chamber, a cylinder head, an intake valve, a partition wall plate, and a tumble valve. The cylinder head includes an intake port that communicates with the combustion chamber. The intake valve includes a head configured to open and close an open end of the intake port. The partition wall plate partitions the intake port into first and second passages. The tumble valve is configured to open and close either one of the first passage and the second passage. A cross sectional shape of the partition wall plate is defined on a basis of a shape of a gap that is surrounded by a contour of the head and a contour of the open end, as viewed in a reference direction. The reference direction is a direction from a reference point in the intake port to a gap between the open end and the head.