Intake Bypass Valve Segmentation for Engine Durability
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Solution Overview
Problem
Conventional internal combustion engines face challenges in adjusting intake air quantity efficiently during startup and idling conditions, leading to reduced valve durability and increased noise, particularly due to the use of expensive valves or low responsiveness in existing valve control methods.
Innovation Solution
The engine incorporates a valve device that controls a first and second bypass passage within the intake passage, using a common solenoid valve to adjust airflow independently, minimizing intake air during startup, maximizing it during cold idling, and maintaining an intermediate level during warm idling without 'duty control', thereby extending valve life and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a solenoid valve is used for duty control to adjust intake air amount, then the amount of intake air can be adjusted, but valve durability is reduced due to frequent opening and closing operations during warm idling
Solution Approach 1:
The bypass passage is divided into a first bypass passage and a second bypass passage, each controlled by its own bypass valve. This segmentation allows independent control of each passage, enabling the system to achieve intermediate air amounts by opening only one bypass passage instead of repeatedly opening and closing the same valve, thereby improving valve durability.
2Adaptability or versatility
If a valve opening and closing operation is performed frequently during warm idling, then intermediate amount of air can be maintained, but noise is generated every time the valve operates
Solution Approach 1:
By dividing the bypass passage into two separate passages with independent valves, the system can maintain intermediate air amounts by keeping one valve open and the other closed, eliminating the need for repeated valve operations and thus preventing noise generation during warm idling.
3Ease of operation
If a linear solenoid is used to adjust intake air to intermediate amount, then air amount adjustment is easy, but cost increases due to expensive linear solenoid
Solution Approach 1:
The system uses two conventional solenoid valves instead of one expensive linear solenoid. Each solenoid valve is controlled independently to achieve three air amount states (small, intermediate, large) by combining their opening and closing patterns, providing the same functionality at lower cost.
Solution Approach 2:
The functions of a expensive linear solenoid capable of intermediate positioning are merged into two conventional solenoid valves working in combination. By controlling the combination of open/closed states of the two valves, the system achieves three-level air amount control equivalent to a linear solenoid but with lower cost components.
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 solution allows for cost-effective adjustment of intake air without expensive valves, enhances valve durability, and prevents abnormal noise during warm idling by optimizing airflow through the use of a solenoid valve capable of multiple steps and a flow restrictor.
Implementation Method 1
When a solenoid valve is used as the above-mentioned valve, the amount of intake air is adjusted by 'duty control' in which the valve is opened during cold idling
Data Source
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Figure 3A~3B
AI summary
An engine includes a main passage in which a throttle valve is provided, and first and second bypass passages that bypass the throttle valve. The engine further includes a valve device capable of opening and closing the first and second bypass passages. Both of the first and second bypass passages are closed or at least intermittently opened before startup of the engine. Each of the first and second bypass passages is at least intermittently opened during cold idling. One of the first and second bypass passages is closed and the other one of the first and second bypass passages is opened during warm idling.