Compressor Bypass Valve Two-Part Displacement Body
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Solution Overview
Problem
Existing compressor bypass systems in multistage supercharging for internal combustion engines are slow to open and close due to the large mass required to move a displacement body, leading to pressure drops and inefficient operation when the choke limit is reached, causing the high-pressure compressor to act as a throttle.
Innovation Solution
A two-part displacement body in the compressor bypass valve, with a lightweight and hollow design, and a flow-promoting shape, along with a guide pin and bushing system, reduces the mass to be moved and minimizes pressure losses, allowing for rapid opening and closing, preventing the high-pressure compressor from acting as a throttle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a displacement body is used to open and close the compressor bypass valve, then the valve can be controlled to divert fresh air around the high-pressure compressor, but the large mass of the displacement body causes slow opening and closing speeds
Solution Approach 1:
The displacement body is divided into two separate displacement parts: a first displacement part that moves rapidly to open/close the bypass valve, and a second displacement part that remains relatively stationary. This segmentation allows the valve control function to be maintained while significantly reducing the mass that must be moved for rapid actuation.
Solution Approach 2:
The patent introduces a guide pin mechanism that constrains the movement of the first displacement part along a specific path. By adding this dimensional constraint, the system achieves rapid valve actuation through controlled linear motion while the second displacement part handles the pressure equalization function, effectively separating the temporal aspects of valve operation.
2Ease of operation
If the displacement body is made large enough to effectively control the bypass, then the mass to be moved increases, but this causes slower response time when the choke limit is reached
Solution Approach 1:
The displacement body is segmented into two parts with different functions: the first displacement part (lighter, smaller) is responsible for rapid valve opening/closing, while the second displacement part (heavier, larger) maintains the pressure differential needed for effective bypass control. This allows the system to achieve both rapid response and effective control.
Solution Approach 2:
The guide pin acts as an intermediary mechanism that transfers motion from the first displacement part to control the bypass valve. It enables the lighter first displacement part to effectively control the valve position without requiring the entire mass of both displacement parts to move rapidly.
3Stress or pressure
If the bypass opens rapidly to prevent the high-pressure compressor from acting as a throttle, then pressure build-up is maintained, but the displacement body requires significant mass to ensure complete closure
Solution Approach 1:
The displacement body is divided into two parts: the first displacement part that moves rapidly to maintain pressure build-up by opening/closing the bypass, and the second displacement part that provides the necessary mass for complete valve closure without requiring rapid movement. This segmentation resolves the contradiction between needing mass for complete closure and needing light mass for rapid response.
Solution Approach 2:
The system transitions from a static, single-mass displacement body to a dynamic two-part system where each part has optimized mass characteristics for its specific function. The first part is lightweight for rapid motion, while the second part provides inertial mass for complete closure, allowing the system to adapt its effective mass based on operational 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
The solution enables immediate diversion of fresh air through the compressor bypass when the choke limit is reached, maintaining pressure and preventing the high-pressure compressor from acting as a throttle, ensuring efficient operation across varying engine demands.
Implementation Method 1
As long as the pressure force on the downstream side is greater than that on the upstream side, the valve is closed. As soon as the pressure on the upstream and downstream sides is equal, the valve opens.
Data Source
AI summary
A compressor bypass valve for multistage supercharging an internal combustion engine equipped with a supercharging system. The valve includes a displacement body accommodated in a valve housing. The displacement body is divided into a first displacement part and a second displacement part. The first displacement part, facing the upstream side, moves to close or open the bypass in response to a pressure differential.