Piston Bowl Geometry for Combustion Emission Reduction
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Solution Overview
Problem
Existing internal combustion engines face challenges in reducing air pollutants and soot emissions while maintaining fuel efficiency, as current designs often compromise on one or the other to comply with stringent emission standards.
Innovation Solution
The design of a piston with a recessed piston bowl featuring a center portion, cone portion, and annular toroidal surface, optimized for specific dimensions and angles, which works in conjunction with a fuel injector to promote efficient mixing of air, residual exhaust gases, and fuel, thereby reducing particulate and soot emissions while maintaining fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional piston designs are used, then fuel efficiency may be maintained, but air pollutants and soot emissions cannot be sufficiently reduced
Solution Approach 1:
The piston bowl is designed with non-uniform geometric properties including a specific cone angle (26-34 degrees), toroidal surface with defined major diameter (4.645-4.895 inches) and minor radius (1.165-1.235 inches), and optimized positioning of fuel injection holes. These localized geometric variations create specific flow patterns and mixing conditions in different regions of the combustion chamber, improving combustion efficiency and reducing emissions while maintaining fuel efficiency.
Solution Approach 2:
The invention optimizes specific geometric parameters of the piston bowl including the cone angle, toroidal dimensions, and fuel injection hole characteristics. By precisely controlling these parameters within specified ranges, the design achieves optimal combustion characteristics that reduce particulate and soot emissions while maintaining fuel efficiency.
2Object-generated harmful factors
If emission reduction measures are implemented, then air pollutants can be reduced, but fuel efficiency deteriorates
Solution Approach 1:
The piston bowl incorporates a toroidal (doughnut-shaped) surface with specific major diameter and minor radius dimensions. This curved geometric feature creates rotational flow patterns and improves fuel-air mixing in the combustion chamber, leading to more complete combustion that reduces soot and particulate emissions while maintaining fuel efficiency through optimized burn characteristics.
Solution Approach 2:
The piston bowl design transitions from conventional flat or simple curved surfaces to a three-dimensional toroidal geometry with specific dimensional constraints. This adds a dimensional complexity that creates multiple flow paths and mixing zones within the combustion chamber, improving combustion efficiency and emission characteristics without sacrificing fuel economy.
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
The piston bowl geometry and fuel injector configuration effectively reduce particulate and soot emissions while ensuring a clean and efficient combustion process, achieving desired emission standards without sacrificing fuel efficiency.
Implementation Method 1
The piston bowl includes a center portion, a cone portion, and an annular toroidal surface... which works in conjunction with a fuel injector to promote efficient mixing of air, residual exhaust gases, and fuel
Data Source
AI summary
A piston for an engine may include a piston crown, and a piston bowl recessed within the piston crown. The piston bowl includes a center portion, a cone portion, and an annular toroidal portion. The geometry of the piston bowl is designed to correspond with a fuel injection nozzle having a specific spray angle. An exemplary piston bowl may include a toroidal major diameter between about 4.645 and 4.895 inches and a toroidal minor radius between about 1.165 and 1.235 inches. The cone portion includes an angle between about 26 to 34 degrees. The compression ratio of the piston is about 17.95 to 1.