Engine Intake Assembly with Selective Boost Bypass
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Solution Overview
Problem
Internal combustion engines face inefficiencies in managing intake air flow, particularly in transitioning between naturally aspirated and boosted operating modes, which affects engine performance and fuel efficiency.
Innovation Solution
An engine assembly with a series flow arrangement of throttle valves and a boost mechanism, allowing for selective bypass of the boost mechanism to adjust intake air flow based on operating conditions, utilizing a turbocharger driven by exhaust gas to power the boost mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a boost mechanism is added to improve engine performance, then power output increases, but device complexity increases
Solution Approach 1:
The intake assembly is designed to perform multiple functions: it operates as a naturally aspirated system during normal operation and as a boosted system when high power is required. The boost mechanism and throttle valves are integrated into a single intake assembly that can switch between operating modes, eliminating the need for separate systems and reducing overall device complexity.
Solution Approach 2:
The system dynamically switches between naturally aspirated and boosted modes based on engine operating conditions. The first and second throttle valves adjust their positions to control air flow, and the bypass mechanism dynamically redirects air flow around the boost mechanism when appropriate, allowing the system to adapt to varying power requirements without manual intervention.
2Measurement precision
If throttle valves are placed in series with the boost mechanism, then air flow control precision improves, but device complexity increases
Solution Approach 1:
The throttle control function is segmented into two separate throttle valves: a first throttle valve positioned before the boost mechanism and a second throttle valve positioned after the boost mechanism. Each valve independently controls air flow at different stages of the boosting process, providing precise control over the total air flow while maintaining manageable complexity through functional segmentation.
3Use of energy by moving object
If the boost mechanism is bypassed during naturally aspirated operation, then fuel efficiency improves, but device complexity increases
Solution Approach 1:
The bypass mechanism dynamically redirects air flow around the boost mechanism during naturally aspirated operation. The second throttle valve controls the bypass passage, allowing air to flow directly from the air source to the intake ports without passing through the boost mechanism, thereby improving fuel efficiency during low-power operation while maintaining the capability for boosted operation when needed.
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
Enables efficient operation in both naturally aspirated and boosted modes, improving engine performance and fuel efficiency by optimizing intake air flow according to engine conditions.
Implementation Method 1
utilizing a turbocharger driven by exhaust gas to power the boost mechanism
Data Source
AI summary
An engine assembly includes an engine structure and an intake assembly. The engine structure defines a first cylinder, a second cylinder, a first intake port in communication with the first cylinder, and a second intake port in communication with the second cylinder. The intake assembly includes a first throttle valve, a second throttle valve and a boost mechanism. The first throttle valve is in communication with the first and second intake ports. The second throttle valve is in communication with an air source and the first throttle valve and located in a series flow arrangement between the air source and the first throttle valve. The boost mechanism is in communication with the air source and the first throttle valve and located in a series flow arrangement between the air source and the first throttle valve.