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Free-piston internal combustion engine

  • US 6,035,637 A
  • Filed: 02/25/1998
  • Issued: 03/14/2000
  • Est. Priority Date: 07/01/1997
  • Status: Expired due to Term
First Claim
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1. A free-piston internal-combustion engine, comprising:

  • a cylinder;

    a piston that is slidingly reciprocatable in said cylinder;

    a combustion chamber within said cylinder and which has a boundary defined by said piston wherein the motion of said piston compresses gas in said chamber during a compression stroke of said piston and expands gas in said chamber during an expansion stroke of said piston;

    a driver for driving said piston in direction that compresses gas in said chamber;

    intake means for drawing gas from a source into said chamber;

    means for adding fuel to said chamber;

    exhaust means for venting products of combustion from said chamber; and

    means for controlling said intake and exhaust means so that the expansion stroke of said piston following ignition of fuel in said combustion chamber is greater than the compression stroke before ignition.

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