Diesel engine

摘要

First and second turbochargers for supercharging a first cylinder group which continues or stops an operation by a valve stopping mechanism for reduced cylinders, and a second cylinder group which stops or continues the operation by the valve stopping mechanism for reduced cylinders, respectively, and a third turbocharger in which air from the first and second turbochargers is supplied to the first and second cylinder groups via separate independent intake passages, to supercharge the first and second turbochargers. If a reduced-cylinder operation system provided with this valve stopping mechanism is provided in addition to the turbo-charging system, a drop in a supercharging amount during a reduced-cylinder operation is prevented, a sufficient air amount is supplied into operating cylinders, deterioration of combustion in the operating cylinders and deterioration of a state of an exhaust gas are prevented, and fuel efficiency is improved.

主权项

1. A diesel engine, comprising:
a first group of cylinders having exhaust valves and intake valves; a second group of cylinders having exhaust valves and intake valves; a valve stopping mechanism to stop the exhaust valves and the intake valves-of one of the first group of cylinders or the second group of cylinders from operating and thereby deactivating the first or second group of cylinders, respectively; a controller for the diesel engine; a main intake passage that separates at a branch into a first intake passage to the first cylinder group and a second intake passage to the second cylinder group a first exhaust passage from the first cylinder group and a second exhaust passage from the second cylinder group; wherein the first and second exhaust passages combine at a merge to form a main exhaust passage; a first turbocharger connected to the first intake passage and connected to the first exhaust passage; a second turbocharger connected to the second intake passage and connected to the second exhaust passage; and a third turbocharger connected to the main intake passage on an upstream side of the branch and connected to the main exhaust passage on a downstream side of the merge; wherein, on a downstream side of a compressor of the first turbocharger, a first intercooler is provided, and on a downstream side of a compressor of the second turbocharger, a second intercooler is provided, respectively, and wherein, the first intake passage on a downstream side of the first intercooler is separate from the second passage on a downstream side of the second intercooler, the first intake passage is connected to an intake manifold of the first cylinder group, and the second intake passage is connected to an intake manifold of the second cylinder group.