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Dual fuel electronic control system

  • US 5,224,457 A
  • Filed: 02/28/1992
  • Issued: 07/06/1993
  • Est. Priority Date: 02/28/1992
  • Status: Expired due to Fees
First Claim
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1. A dual fuel system for an engine having a liquid fuel supply, a source of gaseous fuel, and a controller coupled to the supply, to the source and to the engine, the controller operating the engine in a first mode wherein it is supplied with liquid fuel only and in a second mode wherein it is supplied with both liquid and gaseous fuel, characterized by:

  • an engine speed sensor generating a speed signal representing a rotation speed of the engine; and

    the controller comprising means responsive to the speed signal for maintaining engine speed during dual fuel operation substantially the same as the engine speed during liquid fuel operation.

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