Start up control for engine
AssigneeYamaha Marine Kabushiki Kaisha
InventorMasahiko Kato
Life of this patent
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Abstract
A feed back control system and method for direct injected engines useful in a start up operation that utilizes a fuel pressure condition sensor. At the commencement of cranking, the feed back control system adjusts at least the initiation of fuel injection based upon the output from the fuel pressure condition sensor. This removes a great shift in the fuel pressure between before and after starting of the engine and eventually promotes operator's feeling and also improves exhaust emissions.
Claims15
A direct cylinder injected, internal combustion engine comprising an engine body defining a plurality of cylinder bores in which a corresponding plurality of pistons reciprocate, said pistons driving a marine propulsion device, 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 corresponding plurality of combustion chambers, a corresponding plurality of 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, said engine further comprising 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, and a feedback control system controlling initiation time of a fuel spray by said fuel injectors, the control system advancing the initiation time based upon an output from said fuel pressure condition sensing means when the pressure of the fuel is below a predetermined value and a starter motor of said engine is operating, said feedback control system being configured to subsequently retard the initiation time for one of said combustion chambers, which is connected to a shorter exhaust passage, more than another one of said combustion chambers that is connected to a longer one of the exhaust passages.
A method of operating a direct cylinder injected, internal combustion engine including a combustion chamber, an exhaust port, a fuel injector, a fuel pump, and a sensor, said method comprising controlling initiation time and duration of a fuel spray made by said fuel injector directly into said combustion chamber while said exhaust port is open, sensing a pressure of fuel supplied by said fuel pump with said sensor, determining with an output from said sensor whether said fuel pressure is below a preset value, advancing said initiation time when said fuel pressure is below said preset value, and subsequently retarding said initiation time relative to said advanced initiation time based upon subsequent output from said sensor.
Dependencies are inferred from the claim text.