Free-piston engine | Wikipedia audio article
Channel: wikipedia tts
Date: 05/07/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Free-piston_engine


00:01:20 1 First generation
00:02:21 1.1 Air compressors
00:03:06 1.2 Gas generators
00:03:57 2 Modern applications
00:04:21 2.1 Hydraulic
00:04:47 2.2 Generators
00:07:04 3 Features
00:10:36 3.1 Advantages
00:11:36 3.2 Challenges
00:12:34 4 Opposing piston engine
00:13:00 5 Recent developments



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SUMMARY
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A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).
The purpose of all such piston engines is to generate power. In the free-piston engine, this power is not delivered to a crankshaft but is instead extracted through either exhaust gas pressure driving a turbine, through driving a linear load such as an air compressor for pneumatic power, or by incorporating a linear alternator directly into the pistons to produce electrical power.
The basic configuration of free-piston engines is commonly known as single piston, dual piston or opposed pistons, referring to the number of combustion cylinders. The free-piston engine is usually restricted to the two-stroke operating principle, since a power stroke is required every fore-and-aft cycle. However, a split cycle four-stroke version has been patented, GB2480461 (A) published  2011-11-23.