Internal PCV Routing in Cylinder Head
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Solution Overview
Problem
External positive crankcase ventilation (PCV) lines increase engine profile, reduce fuel economy, and are susceptible to degradation or removal, leading to increased emissions.
Innovation Solution
Internally routing PCV passages through the cylinder head to provide fluidic communication between the crankcase and intake ports without external hoses, enhancing engine compactness and reducing the risk of line degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external PCV lines are used to route crankcase gases to the intake system, then the PCV function is achieved, but the engine profile increases and fuel economy decreases
Solution Approach 1:
The patent integrates the PCV passages directly into the cylinder head structure, merging the PCV routing function with the existing engine component. This eliminates the need for separate external hoses or conduits, thereby achieving the PCV function while reducing the engine profile and improving fuel economy.
2Ease of manufacture
If external PCV lines are used, then the PCV system is simple to implement, but the lines are susceptible to degradation or removal increasing emissions
Solution Approach 1:
By incorporating the PCV passages as integral parts of the cylinder head, the system eliminates separate PCV lines that could degrade or be removed. The merged structure ensures reliable crankcase gas routing while maintaining ease of manufacture through integration into the existing cylinder head manufacturing process.
3Ease of operation
If external PCV lines are used, then the routing is straightforward, but the gases are exposed to the environment increasing loss
Solution Approach 1:
The integrated PCV passages within the cylinder head create a enclosed routing path for crankcase gases, preventing exposure to the external environment. This reduces gas loss while maintaining straightforward routing through the engineered passage geometry within the cylinder head structure.
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 approach reduces emissions by retaining PCV gases within the engine structure, decreases losses due to shorter passage lengths, and prevents external exposure, thereby improving fuel efficiency and emission control.
Implementation Method 1
a PCV passage providing fluidic communication between a crankcase of the engine assembly and a cylinder intake port of the engine assembly
Implementation Method 2
engine vacuum can draw crankcase gases into the engine cylinders for combustion
Implementation Method 3
The PCV passages may not be as easily removed allowing crankcase gases to escape to ambient surroundings
Data Source
AI summary
A positive crankcase ventilation (PCV) system is provided herein. The PCV system includes an engine assembly, the engine assembly including an engine block, a cylinder head, a valve cover, and an intake manifold and a PCV passage providing fluidic communication between a crankcase of the engine assembly and a cylinder intake port of the engine assembly without hoses or conduits external to the engine assembly.