Two-cycle engine with exhaust temperature-controlled ignition timing

  • US 6,371,082 B1
  • Filed: 05/10/2000
  • Issued: 04/16/2002
  • Est. Priority Date: 12/01/1999
  • Status: Expired due to Term
First Claim
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1. A two-cycle engine, comprising;

  • a cylinder;

    a throttle a piston movable in the cylinder, for compressing a fuel-air mixture to be ignited in the cylinder, with exhaust gas from combustion of the fuel-air mixture being expelled from the cylinder;

    an ignition source in the cylinder;

    a controller for activating the ignition source at a particular point during the compressing movement of the piston, the controller activating the ignition source according to an ignition pattern in which an ignition point during the compressing movement varies with operation speed of the engine and throttle position, the ignition pattern being selected from a plurality of different ignition patterns, the different ignition patterns having different relationships between ignition point and engine speed; and

    a sensor for sensing a temperature of exhaust gas from the cylinder, the particular ignition pattern used by the controller being selected based upon the sensed exhaust gas temperature.

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