Intake Duct Restrictor for Combustion Stability
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Solution Overview
Problem
Existing intake duct designs, such as those with increasing cross-sectional areas in the auxiliary passage from the downstream end towards the upstream end, lead to inefficient air intake and reduced engine power due to an oversized cross-sectional area near the upstream end, which hampers the maximization of intake efficiency and engine output.
Innovation Solution
An intake duct with a restrictor minimizing the cross-sectional area of the auxiliary passage between the upstream and downstream ends, intensifying flow velocity and stabilizing engine combustion by optimizing the passage cross-sectional area for improved air intake efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the cross-sectional area of the auxiliary passage is increased toward the upstream end, then the passage cross-sectional area is enlarged, but the intake efficiency is reduced and engine power is restrained
Solution Approach 1:
The patent applies local quality by creating a restrictor at a specific location within the auxiliary passage to minimize the cross-sectional area only at that local position, while other portions of the passage can have different cross-sectional areas. This localized area minimization optimizes flow velocity at the restrictor position without requiring the entire passage to have reduced dimensions, thereby maintaining intake efficiency while achieving the desired flow characteristics for combustion stabilization.
2Speed
If the cross-sectional area of the auxiliary passage is minimized at the downstream end and increased toward the upstream side, then the flow velocity is intensified, but the passage cross-sectional area becomes greater than ideal for maximizing intake efficiency
Solution Approach 1:
The patent applies parameter changes by strategically varying the cross-sectional area parameter along the length of the auxiliary passage. Specifically, a restrictor is positioned to create a minimum cross-sectional area at an optimal location, which changes the flow velocity parameter locally. This controlled parameter variation allows the passage to achieve sufficient flow velocity for combustion stabilization while preventing the overall cross-sectional area from becoming excessively large, thus optimizing both flow velocity and intake efficiency.
3Quantity of substance
If the passage cross-sectional area is enlarged at the upstream end, then the passage can accommodate more flow, but the intake efficiency is insufficient and engine output is restrained
Solution Approach 1:
The patent applies local quality by creating a restrictor at a specific location within the auxiliary passage to minimize the cross-sectional area only at that local position, while other portions of the passage can have different cross-sectional areas. This localized area minimization optimizes flow velocity at the restrictor position without requiring the entire passage to have reduced dimensions, thereby maintaining intake efficiency while achieving the desired flow characteristics for combustion stabilization.
Solution Approach 2:
The patent applies dynamics by using a valve that can open and close the main passage, dynamically controlling the distribution of intake air between the main passage and the auxiliary passage. This dynamic control allows the system to adapt to different operating conditions, ensuring optimal intake efficiency and engine output across various engine states.
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 restrictor configuration enhances engine combustion stability during cold starts and increases engine output by ensuring a greater intake of air into the cylinders while maintaining efficient flow velocity and minimizing pressure loss.
Implementation Method 1
A restrictor that minimizes a cross-sectional area of the auxiliary passage is formed between an upstream end and a downstream end in the direction of intake air flow of the auxiliary passage
Implementation Method 2
a partition extending in a direction of intake air flow, a main passage and an auxiliary passage that are defined by the partition
Implementation Method 3
a valve that opens and closes the main passage
Data Source
AI summary
An intake duct is adapted to be connected to an intake port of a cylinder head. A branch pipe of the intake manifold has in it a partition extending in a direction of intake air flow, a main passage and a tumble flow passage serving as an auxiliary passage that are defined by the partition, and a valve that opens and closes the main passage. A restrictor that minimizes the cross-sectional area of the tumble flow passage is formed between the upstream end and the downstream end in the direction of intake air flow of the tumble flow passage. The cross-sectional area of the tumble flow passage decreases from the upstream end toward the restrictor and increases from the restrictor toward the downstream end.