Opposed Piston Engine Recessed Combustion Chamber

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Solution Overview

Problem

Four-stroke opposed-piston engines face challenges in optimizing power and fuel economy, particularly in reliably igniting fuel-air mixtures within the combustion chamber, as earlier designs were limited by two-stroke technology and insufficient combustion chamber volume.

Innovation Solution

The design incorporates opposed pistons with recessed faces forming an asymmetric combustion chamber, equipped with spark plugs within the recesses to enhance ignition and combustion efficiency, allowing for increased fuel-air mixture and power output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the combustion chamber volume is increased to increase fuel-air mixture and power output, then power output is improved, but reliable ignition of fuel-air mixture becomes more difficult

Engineering Contradiction:

Improvepower outputVSAvoidignition reliability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The combustion chamber is segmented into multiple zones using recesses in the piston faces, creating distinct combustion regions that facilitate more reliable ignition and combustion of larger fuel-air mixtures

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Asymmetric piston face designs with strategically positioned recesses create optimized combustion chamber geometry that enhances ignition reliability while accommodating increased combustion chamber volume for higher power output

Inventive Principle:

Principle #4Asymmetry

2Productivity

If recesses are added to piston faces to optimize combustion chamber geometry, then combustion efficiency is improved, but piston manufacturing complexity increases

Engineering Contradiction:

Improvecombustion efficiencyVSAvoidpiston manufacturing

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

Rather than redesigning the entire piston, only specific localized regions of the piston face are modified with recesses, maintaining overall piston simplicity while achieving improved combustion efficiency in critical areas

Inventive Principle:

Principle #3Local quality

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 improves power output and fuel efficiency by optimizing combustion chamber geometry and ignition, enabling greater air intake and exhaust momentum, thus enhancing the combustion process.

Implementation Method 1

an ignition system that contains at least one spark plug at least partially contained within the first recess

Methodology Applied

Scientific EffectElectrical discharge: Electric Spark

Implementation Method 2

increase the fuel-air mixture and as such, increase the power output produced upon combustion

Methodology Applied

Scientific EffectCombustion: Combustion

Data Source

PatentUS10662893B1Opposed piston engine with improved piston surfaces

Publication Date: 2020.05.26 ENGINUITY POWER SYST INC

AI summary

An opposed-piston engine contains opposed pistons wherein each piston has a piston face containing a recess. The recesses formed in the piston faces define a combustion chamber when contained within a cylinder. An ignition system is at least partially contained within the combustion chamber to enhance the combustion efficiency of a fuel-air mixture within the combustion system.