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Controlling the injection in a fuel injection system selectively operable with petrol or fuel gas

  • US 6,367,443 B1
  • Filed: 03/22/2000
  • Issued: 04/09/2002
  • Est. Priority Date: 10/24/1997
  • Status: Expired due to Fees
First Claim
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1. A method for controlling the operation of a throttled fuel injection system for a multi-cylinder internal combustion engine which can operate selectively with gasoline injection or fuel gas injection,wherein the throttled fuel injection system includes a plurality of electric fuel gas injectors associated with respective cylinders;

  • a main duct for aspiration of air;

    a butterfly valve disposed within the main duct; and

    a control member for controlling the butterfly valve, the method comprising;

    supplying fuel gas to the cylinders, wherein in each engine cycle the fuel gas is supplied selectively to some of the cylinders of the engine based on the power required;

    generating a speed signal (RPM) correlated to a speed of the engine;

    generating a first position signal (Φ

    ) correlated to a phase of the engine;

    generating a second position signal (θ

    ) correlated to a position of the control member;

    selecting, in said each engine cycle and based on the speed signal (RPM) and the position signals (Φ

    , θ

    ), a number of the injectors to be actuated and which of the injectors to actuate, wherein the injection system includes a gasoline injection pump;

    a de-coupler for selectively de-coupling the control member from the butterfly valve and a regulator for regulating a position of the butterfly valve, generating a stop gasoline supply command signal for the injection pump;

    generating a de-coupling command signal for the selective de-coupler;

    generating an open command signal for the regulator for regulating the position of the butterfly valve; and

    generating an actuation signal for each of the injectors to be actuated.

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