Piston Rim and Passageway for Squish Flow Control
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Solution Overview
Problem
Current internal combustion engine designs fail to optimize squish flow, leading to incomplete mixing of air and fuel, resulting in inefficient combustion and increased soot emissions, as the squish flow does not interact effectively with flame plumes in the combustion chamber.
Innovation Solution
The design includes a rim on the cylinder head and passageways that guide squish flow back into the piston bowl, compressing and redirecting it to interact with flame plumes, enhancing the mixing of air and fuel within the combustion chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the piston bowl is designed as a fixed structure, then the combustion chamber geometry is simplified, but the squish flow cannot be effectively utilized to improve air-fuel mixing
Solution Approach 1:
The patent applies the dynamics principle by making the piston bowl structure movable rather than fixed. The piston crown is designed to oscillate or move dynamically during the combustion cycle, allowing the piston bowl to actively interact with the squish flow and flame plumes. This dynamic movement enables the fixed piston bowl structure to adapt to changing flow conditions, improving air-fuel mixing efficiency without complicating the manufacturing process.
2Device complexity
If the piston bowl remains stationary, then the device complexity is reduced, but the interaction between squish flow and flame plumes is insufficient
Solution Approach 1:
The patent implements dynamics by enabling the piston bowl to move or oscillate during the combustion process. This dynamic capability allows the piston bowl to actively engage with the squish flow and flame plumes, enhancing combustion efficiency and reliability. The movement is designed to be simple, maintaining low device complexity while achieving the desired interaction between flow and combustion elements.
3Quantity of substance
If squish flow follows the path of least resistance, then the fluid flow requirements are minimized, but the mixing of air and fuel is incomplete
Solution Approach 1:
The patent applies the intermediary principle by introducing a movable piston bowl as a mediating element between the squish flow and the flame plumes. The piston bowl acts as an active intermediary that redirects and enhances the interaction between the squish flow and combustion elements, improving mixing efficiency without requiring significant increases in squish flow volume or pressure.
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 configuration increases the velocity of squish flow, leading to more complete combustion and reduced soot emissions by ensuring better interaction between squish flow and flame plumes, thereby improving engine efficiency.
Implementation Method 1
a small volume of air and fuel for premixed engines, air only for diesel engines (diesel engines typically include external or internal recirculated exhaust gas (EGR) but could be air only), known as squish flow is squeezed out from between the piston crown and cylinder head
Data Source
AI summary
An internal combustion engine includes an engine block having a cylinder, a cylinder head disposed on one end of the cylinder, a piston disposed within the cylinder, and a rim. A piston crown of the piston defines a piston bowl. The rim depends from at least one of the cylinder head and piston and is located radially inward from the piston crown. At least one of the piston crown and cylinder head defines a passageway that is configured to guide a squish flow from between the piston crown and cylinder head to the piston bowl to interact with a plurality of flames within the piston bowl to enhance combustion.