Patent ID: 7204214
Filing Date: 2007-04-17
Classification: F01L

Abstract:
1. A multi-cylinder internal combustion engine, comprising: a first cylinder; a second cylinder that shares an exhaust manifold with the first cylinder and is fired a predetermined firing interval after the first cylinder; and an exhaust cam shaft having a first cam for opening/closing an exhaust valve of the first cylinder and a second cam for opening/closing an exhaust valve of the second cylinder, wherein a valve overlap region of the first cylinder while the first cylinder is shifting from an exhaust stroke to an intake stroke overlaps a time period during which the exhaust valve of the second cylinder is open while the second cylinder is shifting from a power stroke to an exhaust stroke; and a nose of the first cam is located at a first phase position and a nose of the second cam is located at a second phase position on the exhaust cam shaft, the second phase position being farther in a retard direction than a position that is away in the retard direction from the first phase position by an angle corresponding to the predetermined firing interval.