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A control system for a dual fuel engine using primary diesel fuel and supplemental gas fuel such as propane or natural gas includes a control valve that controls supplemental fuel mixing with intake air by using an air deflectable member that controls the position of a valve controlling the admissio

A control system for a dual fuel engine using primary diesel fuel and supplemental gas fuel such as propane or natural gas includes a control valve that controls supplemental fuel mixing with intake air by using an air deflectable member that controls the position of a valve controlling the admission of supplemental gas to the engine intake airstream. A damper is provided on the air flow responsive member to improve valve operation and a lost motion connection is provided between the air flow responsive member and the control valve element to permit independent movement of the elements. Normal flow of supplemental fuel to the control valve is further modulated in response to certain engine operating conditions using an engine condition comparator that generates a control signal used by the supplemental fuel pressure regulator to further modulate the supply of supplemental fuel to the intake airstream. The system includes a supplemental fuel shut-off system that restores full primary diesel fuel flow to the engine when the supply of supplemental fuel approaches depletion.

대표청구항 ▼

A control valve for a supplemental fuel supply to an internal combustion engine provided with a primary liquid fuel supply, comprising a valve housing provided with an air duct extending the length of the housing and having inlet and outlet ends; a movable air flow responsive member in said duct res

A control valve for a supplemental fuel supply to an internal combustion engine provided with a primary liquid fuel supply, comprising a valve housing provided with an air duct extending the length of the housing and having inlet and outlet ends; a movable air flow responsive member in said duct responsive to air flowing through said duct towards said outlet end so as to be deflected in a first direction in response to such air flow; means for resiliently biasing said air flow responsive member in a direction opposite to said first direction; a supplemental fuel inlet in said housing; a supplemental fuel passageway in said housing to provide communication between said supplemental fuel inlet and said air duct at a point between said air flow responsive member and the outlet end of said duct; a valve element for controlling said supplemental fuel flow through said passageway, said valve element movable between closed and open positions in response to the movement of said air flow responsive member between undeflected and deflected positions, respectively, said valve element being movable between said open and said closed positions independently of said air flow responsive member; and fluidic damper means for damping the motion of said air flow responsive member.