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Supplemental gaseous fuel system for a diesel engine

  • US 5,355,854 A
  • Filed: 03/12/1993
  • Issued: 10/18/1994
  • Est. Priority Date: 03/12/1993
  • Status: Expired due to Fees
First Claim
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1. A supplemental gaseous fuel system for a diesel engine including an intake manifold, a fuel injector pump having an actuator for regulating a volume of diesel fuel supplied to said engine, and load sensitive speed control means for controlling movement of said actuator responsive to variations in engine speed, comprising:

  • gaseous fuel inductor means for introducing a flow of gaseous fuel into said intake manifold;

    throttle valve means for determining a maximum flow of gaseous fuel to said fuel inductor means at a given intake suction pressure;

    buffer valve means for selectively controlling said flow of gas to said throttle means, said buffer valve means being actuable between a normally closed position and an open position;

    a gaseous fuel supply manifold operative for providing said flow of gaseous fuel, said fuel supply manifold including automatic block and vent means for selectively blocking and venting said flow, said block and vent valve means being actuable between a normally closed position and an open position, said fuel supply manifold further including a demand gas regulator,said regulator being connected to said buffer valve means, said regulator being operative for sensing a negative flow pressure through said buffer valve means and allowing said gaseous fuel to be drawn into the engine'"'"'s charge air at a flow rate proportional to the combustion rate;

    means for sensing a physical position of said actuator;

    means for opening said block and vent means and said buffer valve means responsive to a predetermined position of said actuator, said block and vent means opening substantially instantly to provide a flow of gaseous fuel to said demand regulator, said buffer valve means cycling open over a predetermined time to gradually allow said flow of gaseous fuel to be drawn into said intake manifold from said regulator; and

    means for closing said buffer valve means and said block and vent means responsive to a second predetermined position of said actuator, said buffer valve means cycling closed over a predetermined time to gradually reduce said flow of gaseous fuel to said intake manifold, said block and vent means closing a predetermined time after said buffer valve means cycles closed,said load sensitive speed control means being operable for responding to variations in engine speed with a volume of diesel fuel, said supplemental fuel system being operative for replacing a given volume of diesel fuel during a steady state load.

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