Patent ID: 6357417
Filing Date: 2002-03-19
Classification: F02B,F02D,F02M,Y02T

Abstract:
A direct cylinder injected, internal combustion engine for a marine propulsion device comprising an engine body defining a plurality of cylinder bores in which pistons reciprocate, a cylinder head affixed to one end of said engine body for closing said cylinder bores and defining with said pistons and said cylinder bores a plurality of combustion chambers, fuel injectors for spraying fuel directly into said combustion chambers, a fuel pump for supplying the fuel to said fuel injectors, means for sensing a pressure of the fuel supplied by said fuel pump, a control system controlling initiation time of fuel spray by said fuel injectors, the control system advancing the initiation time based upon an output from said fuel pressure sensing means when the pressure of the fuel is below a predetermined value, said control system retarding the initiation time, which has been initially advanced, step by step every reciprocation of said pistons until the pressure of the fuel reaches the predetermined value, and an exhaust system for discharging burnt combustion products to a body of water from said combustion chambers, the exhaust system including a plurality of exhaust passages connected to said combustion chambers and having different lengths from each other, said control system being configured to retard the initiation time for one of said combustion chambers, which is connected to one of the exhaust passages shorter than other one of the exhaust passages, more than the initiation time for other one of said combustion chambers that is connected to said other one of the exhaust passages.