PROCEDURES AND DEVICE FOR ENGINE BRAKING WITH A FIREWORKS ENGINE

Abstract

Abstract PCT No. PCT/SE90/00102 Sec. 371 Date Sep. 13, 1991 Sec. 102(e) Date Sep. 13, 1991 PCT Filed Feb. 15, 1990 PCT Pub. No. WO90/09514 PCT Pub. Date Aug. 23, 1990.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 establishes 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-center position after the inlet stroke and during the latter part of the compression stroke and during at least 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).

Inventors

• 👤 U Gobert

Bibliographic Details