A method and a device for engine braking a four stroke...

F - Mech Eng,Light,Heat,Weapons – 01 – L

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F01L 13/06 (2006.01) F02D 13/04 (2006.01) F02B 75/02 (2006.01)

Patent

CA 2047219

The invention relates to a method and an arrangement for engine braking a four-stroke internal combustion engine. The engine has for each cylinder (2) at least one inlet valve (7) and at least one exhaust valve (9) for controlling communication between a combustion chamber (5) in the cylinder (2) and an inlet system (8) and an exhaust system (10) respectively. In accordance with the invention) the arrangement also includes means for establishing communication between the combustion chamber (5) and the exhaust system (10) in conjunction with the exhaust stroke and also when the piston (3) is located in the proximity of its bottom-dead-centre position after the inlet stroke and during the latter part of the compression stroke and during at least a part of the expansion stroke. Communication of the combustion chamber (5) with the exhaust system (10) is effected upstream of a throttling device (13) provided in the exhaust system) this throttling device being operative to throttle at least a part of the flow through the exhaust system (10) during an engine braking operation, therewith to increase the pressure upstream of the throttling device (13).

La présente invention se rapporte à un procédé et à un agencement servant au freinage moteur d'un moteur à combustion interne à quatre temps. Le moteur comporte pour chaque cylindre (2) au moins une soupape d'admission (7) et au moins une soupape d'échappement (9) servant à commander la communication entre une chambre de combustion (5) située dans le cylindre (2) et un système d'admission (8) et un système d'échappement (10), respectivement. Selon la présente invention, l'agencement comprend également un organe servant à établir une communication entre la chambre de combustion (5) et le système d'échappement (10) en conjonction avec la course d'échappement et également lorsque le piston (3) se trouve à proximité de la position de point mort bas, après la course d'admission et pendant la dernière partie de la course de compression et pendant au moins une partie de la course de détente. La communication entre la chambre de combustion (5) et le système d'échappement (10) s'effectue en amont d'un dispositif d'étranglement (13) disposé dans le système d'échappement, ce dispositif d'étranglement fonctionnant de façon à étrangler au moins une partie de l'écoulement traversant le système d'échappement (10) lors d'un freinage moteur, augmentant ainsi la pression en amont du dispositif d'étranglement (13).

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