Institut Francais Du Pe'trole

Stephane Venturi

Pierre Duret

Xavier Montagne

Jacques Lavy

Process for delivering and for metering at least one additive to the

A device for controlling a pneumatic injection of a carbureted mixture into a combustion chamber of a two stroke internal combustion engine, with the device including a compressed gas supply pipe adapted to be communicated with the combustion chamber of a cylinder by an intermittent sealing element, and a fuel metering device opening into the compressed gas supply pipe. A selective sealing element is arranged in the compressed gas supply pipe upstream from the intermittent sealing element and from the fuel injection device for controlling all carbureted mixture conveyed into the compressed gas supply pipe and used for pneumatic injection according to operating conditions of the internal combustion engine.

Device for controlling the pneumatic injection of a carbureted mixture

The object of the present invention is a seal device for a valve rod controlled by a cam included in a camshaft housing of an internal-combustion engine having at least one cylinder. The device according to the invention includes a pipe (10) connecting on the one hand a feed line (2) for feeding the carbureted mixture into a combustion chamber (1) closed by a valve (5) and, on the other hand, a camshaft housing (4). A nonreturn valve (11) is arranged in said pipe (10) in order to divide said pipe (10) into two volumes (12, 13), the first volume (12) being connected to housing (4) and forming a capacity under pressure having a pressure P1 greater than or equal to the pressure P2 prevailing in feed line (2) and in the second volume (13). The device according to the invention is intended for preventing fuel leaks from the feed line (2) towards the camshaft housing (4).

Seal device for valve rod of an internal-combustion engine

A two-stroke engine comprising a crankshaft rotating around a first axis of rotation and having at least one balancing mass, a controller for controlling feeding of at least one combustion chamber of the engine. A second shaft is rotatable around a second axis of rotation parallel to the first axis of rotation and is rotatably driven by the crankshaft. At least one balancing mass is connected in rotation to the controller so as to achieve a first order balancing of the reciprocating masses of the engine. A pneumatic fuel injection system, utilizing a portion of an air charge of the engine, sprays fuel into the combustion chamber at predetermined times of a working cycle, and a counter rotating drive of the pneumatic injection controller means by the crankshaft is achieved by a two-space toothed belt.

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La Rochette, France

Stephane Venturi