Free-Piston Engine Dual-Compression System
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Solution Overview
Problem
Conventional free-piston engines are limited in achieving high output with high efficiency, noise reduction, and clean exhaust gas, and they cannot cover a wide range of output requirements for various applications such as generation equipment, automobiles, aircraft, and rockets.
Innovation Solution
A free-piston engine design that includes a combustion space for air-fuel mixture combustion, a piston capable of reciprocation between compressed and expanded positions, a piston drive device, suction and exhaust ports, and a rotary or piston-type valve that allows for high-speed piston motion, combined gas compression, and collision-induced jet compression, minimizing noise and harmful emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If compression is performed by piston motion only, then the engine structure is simple, but high compression ratio and high output cannot be achieved
Solution Approach 1:
The patent combines piston motion compression with gas collision compression in a dual-compression system. The piston moves to compress the air-fuel mixture while simultaneously injected gas jets collide to provide additional compression, achieving high compression ratios without overly complicating the engine structure.
Solution Approach 2:
The compression process is divided into two independent but coordinated actions: piston-driven mechanical compression and gas jet collision compression. This segmentation allows each mechanism to be optimized independently while working together to achieve the desired high compression ratio and output.
2Productivity
If piston moves at high speed, then power output increases, but balance adjustment becomes difficult and construction cannot suit high-speed motions
Solution Approach 1:
The system uses gas pressure balance to automatically control piston motion at high speeds. The gas pressure differential between the two sides of the piston self-regulates the motion, eliminating the need for complex mechanical balance adjustment mechanisms and enabling stable high-speed operation.
3Stability of the object's composition
If gas contacts engine walls extensively, then combustion is stable, but heat losses increase and efficiency decreases
Solution Approach 1:
The combustion process is segmented into a core collision compression zone where gas jets collide and combust, and a peripheral zone with minimal wall contact. This segmentation concentrates combustion in the center, reducing heat transfer to walls while maintaining combustion stability through the focused energy release of gas collision.
4Reliability
If conventional engine design is used, then structure is proven, but cannot satisfy high output with high efficiency, noise reduction, and clean exhaust gas simultaneously
Solution Approach 1:
The engine employs a composite approach combining proven piston-engine architecture with jet-compression technology. This creates a hybrid system that retains the reliability of conventional engines while gaining the high efficiency, noise reduction, and clean exhaust characteristics of jet-based combustion.
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 engine achieves high-output, high-efficiency operation with reduced noise and clean exhaust, capable of meeting a wide range of output demands by leveraging piston and valve mechanisms for efficient power extraction and gas compression, while minimizing contact with engine walls to reduce heat losses.
Implementation Method 1
combustion of the air-fuel mixture in the combustion space
Implementation Method 2
explosive power due to the combustion of the air-fuel mixture
Implementation Method 3
compression of an air-fuel mixture in the combustion space
Implementation Method 4
the piston functions as a valve of the exhaust port and opens the exhaust port to the combustion space
Data Source
AI summary
The free-piston engine 10 includes a combustion space F for combusting an air-fuel mixture, a piston 12 capable of reciprocation between a most-compressed position and a most-expanded position, suction ports 14 for introducing outside air into the combustion space F, and exhaust ports 16 for directing the exhaust gas to the outside. The piston 12 extracts power by moving from the most-compressed position to the most-expanded position by a combustion explosive force and returns from the most-expanded position to the most-compressed position by the actuation of a piston drive device. Furthermore, the piston 12 opens the exhaust port 16 to the combustion space F when the piston 12 has reached the most-expanded position, whereas the piston 12 closes the exhaust ports 16 to the combustion space F when the piston is present in a different position.