One-Piece Valve Guide for Turbo Lag Reduction
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Solution Overview
Problem
Turbocharged diesel engines experience inadequate torque and power at low rpm due to turbo lag, which is exacerbated by the need to limit fuel injection to prevent smoke from incomplete combustion, leading to reduced performance during take-off phases.
Innovation Solution
A valve arrangement with a tubular, one-piece valve guide design that allows for efficient assembly and additional air supply to the engine, featuring an inner groove and aperture for direct communication with a feeder channel, enabling increased fuel injection and reduced turbo lag through pressurized air injection after main inlet valves close.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a two-piece valve guide design is used to enable additional air supply, then the engine can receive additional air to reduce turbo lag, but the assembly process becomes more complex requiring multiple tools and operations
Solution Approach 1:
The patent merges the upper and lower valve guide portions into a single integrated valve guide component. This one-piece design eliminates the need for separate assembly operations and tools while maintaining the cavity structure necessary for additional air supply, thus resolving the contradiction between providing additional air and simplifying assembly complexity
2Quantity of substance
If a two-piece valve guide design is used, then additional air supply is enabled, but manufacturing precision requirements increase due to need for coaxial alignment
Solution Approach 1:
By combining the upper and lower valve guide portions into a single monolithic component, the patent eliminates the coaxial alignment requirement between separate parts. The integrated design ensures precise positioning of the cavity and aperture without requiring post-assembly reaming or alignment operations, thus resolving the manufacturing precision issue
3Object-generated harmful factors
If fuel injection is limited during take-off phase, then smoke from incomplete combustion is minimized, but engine torque and power are reduced
Solution Approach 1:
The patent introduces additional air to the cylinder before the main combustion event during the take-off phase. This preliminary air supply ensures sufficient oxygen is available when fuel is injected, preventing incomplete combustion and smoke formation while allowing full fuel injection for maximum torque and power
4Power
If turbocharger is used to increase air supply, then engine power is improved, but turbo lag occurs reducing low rpm performance
Solution Approach 1:
The patent uses a spring-loaded valve mechanism that stores and releases additional air in advance during the intake stroke, particularly at low rpm conditions. This preliminary action provides immediate air supply without waiting for turbocharger response, eliminating turbo lag while maintaining the turbocharger's power benefits at higher rpm
Data Source
AI summary
A valve arrangement for supplying air to an internal combustion engine includes a first valve and a second valve arranged within the first valve. A valve guide for use in a valve arrangement is also provided.