Patent ID: 8065988
Filing Date: 2011-11-29
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A four-cycle engine configured to cause backflow of a high-pressure exhaust gas from a second cylinder unit into a first cylinder unit by EGR so that an exhaust valve of the first cylinder unit is reopened around a bottom dead center from an intake stroke to a compression stroke of the first cylinder unit, and to set a pressure in the first cylinder unit to be higher than a pressure in an intake port at a start of the compression stroke of the first cylinder unit, wherein an average pressure in an exhaust port at an overlap period during which the exhaust valve of the first cylinder unit is in an EGR opening period overlaps with a period during which an intake valve of the first cylinder unit is in an open position, wherein the average pressure in the exhaust port at the overlap period is set to be lower than an average pressure in the exhaust port within the EGR opening period and after a lapse of the overlap period.