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US 5,682,867 AGranted
Feedback control system for marine propulsion engine
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsMasahiko Katoh, Kimihiro Nonaka, Kazuhiro Nakamura
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AssigneeSanshin Kogyo Kabushiki Kaisha
InventorsMasahiko Katoh, Kimihiro Nonaka, Kazuhiro Nakamura
Estimating the term…
A number of embodiments of feedback control systems for maintaining the desired air fuel ratio in a marine propulsion engine that has an exhaust system for exhausting the exhaust gases to the atmosphere through an underwater exhaust gas discharge and wherein the discharge is adjustable relative to the associated watercraft. Conditions which will change the back pressure in the exhaust system are measured and the amount of fuel air ratio supplied to the engine by a feedback control system is varied, depending upon the sensed airflow and the sensed condition of the exhaust outlet that may affect back pressure and, accordingly, the ideal air fuel ratio. Spark ignition timing is also changed and the air fuel ratio may be corrected depending upon exhaust back pressure.
A fuel control method for a two-cycle, crankcase compression, marine propulsion engine having a crankcase chamber containing a crankshaft, a fuel supply device for supplying fuel to the engine for combustion, a crankcase pressure sensor, an exhaust port for discharging exhaust gases from the engine, an exhaust system for collecting exhaust gases from the exhaust port and delivering them to the atmosphere through an exhaust outlet at least in part below the level of water in which the propelled vessel is traveling at least under certain running conditions, said method comprising the steps of sensing the crankcase pressure at least one specific angular position of the crankshaft, calculating an air flow amount from the sensed crankcase pressure, sensing a condition which will effect the back pressure in said exhaust system and adjusting the calculated amount of air flow in response to the sensed condition.
A fuel control method for an internal combustion engine having a plurality of cylinders, a fuel supply device comprising a plurality of charge formers, each supplying fuel to a respective cylinder of the engine, a plurality of exhaust ports in said engine for discharging combustion products from the respective cylinders thereof, an exhaust system for collecting exhaust gases from said exhaust ports comprising a collector section for collecting all of the exhaust gases and discharging them to the atmosphere through a common outlet, an air fuel ratio sensor for sensing the air fuel ratio supplied to the engine by the charge formers, said method comprising the steps of supplying fuel to said engine from said charger formers, reading the output of the air fuel sensor, adjusting the amount of fuel supplied to the engine by the charge formers in response to the output of the air fuel sensor to maintain the desired air fuel ratio and adjusting the amount of fuel supplied to each charger formers depending upon the distance of the exhaust port of the respective cylinder from the exhaust outlet.
A fuel control for a two-cycle, crankcase compression, marine propulsion engine having a crankcase chamber containing a crankshaft, a fuel supply device for supplying fuel to the engine for combustion, a crankcase pressure sensor, an exhaust port for discharging exhaust gases from the engine, an exhaust system for collecting exhaust gases from the exhaust port and delivering them to the atmosphere through an exhaust outlet at least in part below the level of water in which the propelled vessel is traveling at least under certain running conditions, means sensing the crankcase pressure at at least one specific angular position of the crankshaft, and calculating an air flow amount from the sensed crankcase pressure, means for sensing a condition which will effect the back pressure in said exhaust system and adjusting the calculated amount of air flow in response to the sensed condition.
A fuel control for an internal combustion engine having a plurality of cylinders, a fuel supply device comprising a plurality of charge formers, each supplying fuel to a respective cylinder of the engine, a plurality of exhaust ports in said engine for discharging combustion products from the respective cylinders thereof, an exhaust system for collecting exhaust gases from said exhaust ports comprising a collector section for collecting all of the exhaust gases and discharging them to the atmosphere through a common outlet, an air fuel ratio sensor for sensing the air fuel ratio supplied to the engine by the charge formers, means for controlling the supply of fuel to said engine from said charger formers and adjusting the amount of fuel supplied to the engine by the charge formers in response to the output of said air fuel sensor to maintain the desired air fuel ratio and adjusting the amount of fuel supplied to each charger formers depending upon the distance of the exhaust port of the respective cylinder from the exhaust outlet.
Dependencies are inferred from the claim text.