Dual Valve Engine Distribution System for Volumetric Efficiency
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Solution Overview
Problem
Conventional internal combustion engines face limitations in volumetric and pumping efficiency due to bottlenecks caused by reciprocating poppet valves, especially in high-performance engines where further power increases are restricted by physical and structural constraints.
Innovation Solution
The implementation of a dual distribution system that includes secondary rotary valves connected in synchronism with primary poppet valves to enhance air intake and exhaust flow, allowing additional air entry and gas exit simultaneously, thereby increasing the gas transfer area and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reciprocating poppet valves are used for air intake and exhaust, then the engine structure is simple and reliable, but the gas transfer area is limited and volumetric efficiency is reduced
Solution Approach 1:
The valve system is segmented into two independent subsystems: primary reciprocating poppet valves and secondary rotary valves. Each subsystem operates independently to perform the same gas transfer function, allowing the system to maintain reliability through proven technology while significantly increasing the total gas transfer area through additive configuration.
Solution Approach 2:
Two different valve mechanisms (reciprocating poppet valves and rotary valves) are merged into a single integrated distribution system. The primary and secondary valves work simultaneously in parallel, combining their gas transfer capabilities to overcome the area limitations of individual valve types while maintaining the simplicity and reliability of the poppet valve foundation.
2Productivity
If high-diameter large raised valves with aggressive phasing are used, then the passage area is maximized, but the structural resistance and space availability are exceeded
Solution Approach 1:
The gas transfer function is segmented between multiple valves of moderate size rather than relying on a single oversized valve. This distribution of flow responsibility across primary and secondary valves allows each valve to operate within its structural strength limits while collectively achieving the required total passage area.
Solution Approach 2:
The system transitions from a single-plane valve arrangement to a multi-dimensional configuration by adding rotary valves that operate in a different spatial and temporal dimension. This allows increased gas transfer area without proportionally increasing the mechanical stress on individual valve components.
3Productivity
If four valves per cylinder with alternate axial movement are used, then the gas transfer area is increased, but the device complexity and cost increase
Solution Approach 1:
The distribution system is segmented into two functional layers: a primary layer using simple reciprocating poppet valves with cam mechanism actuation, and a secondary layer using rotary valves. This segmentation allows the complex rotary valve function to be added without completely redesigning the proven primary valve system, thereby controlling overall complexity.
Solution Approach 2:
The dual valve system is designed with universal applicability to various engine configurations and operating conditions. The primary and secondary valves can be selectively activated or deactivated based on engine load and speed requirements, providing multi-functional adaptability that justifies the increased complexity through enhanced performance across different operating regimes.
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
An endothermic engine (4) comprising at least one cylinder (8) that houses and guides, according to a reciprocating rectilinear motion, a piston (12) operatively connected to a drive shaft according to a connecting rod/crank mechanism (16), the cylinder (8) being provided with at least one first main intake valve (20) and at least one first main exhaust valve (24). Advantageously, at least one of said first main intake and/or exhaust valves (20,24) is fluidically connected to a duct (28) that forks into an intake channel (36) intercepted by a secondary intake valve (40) and into an exhaust channel (44) intercepted by a secondary exhaust valve (48). -The intake channel (36) is fluidically connected to an intake system of the engine (4) and the exhaust channel (44) is fluidically connected to an exhaust system of the engine (4); the secondary intake and exhaust valves (40,48) being kinematically connected in synchronism with the respective first main intake and/or exhaust valve (20,24) so as to cyclically allow the additional entry of air in the cylinder (8) through the intake channel (36), connected to the first main exhaust valve (24), at least partially simultaneously with the entry of air from the first main intake valve (20), and to allow the additional exit of combustion gases from the cylinder (8) through the exhaust channel (44), connected to the first main intake valve (20), at least partially simultaneously with the exit of combustion gases through the first main exhaust valve (24) .