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Apparatus for automatically controlling operation of the throttle assembly of a motor vehicle engine system during operation of power take-off equipment

  • US 5,642,711 A
  • Filed: 02/15/1996
  • Issued: 07/01/1997
  • Est. Priority Date: 02/15/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for automatically controlling operation of the throttle assembly of a motor vehicle engine system, which includes an accelerator pedal and a fuel pump, during operation of power-take-off equipment including a power-take-off switch, which comprises:

  • A. a blocker valve means being pneumatically controlled and being operable to move to an opened position responsive to operation of a power-take-off means to facilitate blocking of operation of an accelerator pedal of a motor vehicle and being operable to move to a closed position during normal vehicle operation without operation of the power-take-off means;

    B. a throttle valve means being pneumatically controlled and being operable to move to an opened position to allow controlled operation of the fuel pump of a motor vehicle engine system to control motor operating speed, said throttle valve means being operable to move to a closed position during normal vehicle operation without power-take-off;

    C. a primary pneumatic line means being in fluid flow communication with a supply of pressurized air and further being in fluid flow communication with said blocker valve means and with said throttle valve means to supply pressurized air thereto;

    D. a blocker pneumatic line means extending from said blocker valve means and being in fluid flow communication therewith to receive pressurized air therefrom responsive to said blocker valve means being in the opened position;

    E. a throttle pneumatic line means extending from said throttle valve means and being in fluid flow communication therewith to receive pressurized air therefrom responsive to said throttle valve means being in the opened position;

    F. a blocker cylinder means in fluid flow communication with said blocker pneumatic line means to receive pressurized air therefrom, said blocker cylinder means including a blocker piston means movably mounted therein, said blocker piston means being movable to a blocking position to restrict operation of the motor vehicle accelerator pedal responsive to operation of the power-take-off equipment with said blocker valve means being in the opened position and with pressurized air being supplied to said blocker cylinder means through said blocker pneumatic line means;

    G. a throttle cylinder means in fluid flow communication with said throttle pneumatic line means to receive pressurized air therefrom, said throttle cylinder means including a throttle piston means movably mounted therein, said throttle piston means being selectively movable to a operating position to facilitate operation of the fuel pump to urge operation the vehicle motor at a desired operating speed thereof to facilitate operation of power-take-off equipment responsive to said throttle valve means being in the opened position with pressurized air being supplied to said throttle cylinder means through said throttle pneumatic line means; and

    H. a fuel pump operating means attached to the fuel pump of the vehicle and to said throttle piston means to facilitate control of operation of the fuel pump by the throttle piston means to selectively control motor operating speed.

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