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US 6,612,272 B2Granted
Cooling arrangement for direct injected engine
AssigneeYamaha Marine Kabushiki Kaisha
InventorsMasahiko Kato, Takayuki Sato, Hiroaki Fujimoto
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AssigneeYamaha Marine Kabushiki Kaisha
InventorsMasahiko Kato, Takayuki Sato, Hiroaki Fujimoto
Estimating the term…
Cooling arrangements that cool down fuel injectors exposed to the high temperature combustion in direct injected engines so that no heavy oil components deposit on nozzles of the fuel injectors. A bypass of water flow extends in the proximity of the boss where the fuel injector is inserted to expedite cooling of the fuel injector. A cavity extending toward the boss can replace the bypass or can be additionally provided. The fuel injector boss and a spark plug boss are connected with each other and make a wall that can obstruct water flow. Another bypass is provided to clear water away from a backwater formed at the wall. In case that some heavy oil components deposit on the injector nozzles for some reasons, a control system for controlling the fuel injection is allowed to adjust amounts of the fuel basically in response to the temperature of the injector nozzle.
A direct cylinder injected, internal combustion engine comprising a cylinder body defining at least one cylinder bore in which a piston reciprocates, a cylinder head affixed to an end of said cylinder body for closing said cylinder bore and defining with said piston and said cylinder bore a combustion chamber, a fuel injector spraying fuel directly into said combustion chamber for combustion therein, temperature sensing means for sensing the temperature of said fuel injector, and a control system receiving an input signal from the temperature sensing means and being electronically coupled to said fuel injection, the control system being configured to adjust the amount of the fuel that the fuel injector sprays into the combustion chamber based upon the input signal from said temperature sensing means.
An internal combustion engine comprising an engine body, a movable member movable relative to the engine body, the engine body and the movable member together defining a combustion chamber, a fuel injector spraying fuel directly into the combustion chamber, the fuel injector having an injection nozzle, at least a portion of the injection nozzle being exposed to the combustion chamber, a temperature sensor disposed near the injection nozzle, and a control device coupled with the fuel injector and to the temperature sensor, the control device being configured to control an amount of fuel injected by the fuel injector, the control device adjusting the amount of the fuel based upon a signal from the temperature sensor.
Dependencies are inferred from the claim text.