Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2005-03-01
2005-03-01
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090150, C074S56800M
Reexamination Certificate
active
06860246
ABSTRACT:
A marine drive has an engine, a propeller and a transmission to switch the propeller between a propulsion position and a non-propulsion position. The engine has a combustion chamber. An air induction system communicates with the combustion chamber through an intake port. An exhaust system communicates with the combustion chamber through an exhaust port. Intake and exhaust valves move between an open position and a closed position of the intake port and the exhaust port, respectively. Intake and exhaust camshafts actuate the intake and exhaust valves, respectively. A VVT mechanism changes an actuating timing of the intake camshaft at which the camshaft actuates the intake valve. An ECU controls the intake camshaft to set the actuating timing at a generally optimum timing. A transmission position change operation sensor senses that the transmission is under operation and sends a signal to the ECU. The ECU controls the VVT mechanism based upon the signal to move the actuating timing away from the optimum timing. Otherwise, a transmission position sensor senses that the transmission is in a neutral position and sends a signal to the ECU. The ECU controls the VVT mechanism based upon the signal to bring the actuating timing to a generally fully retarded timing.
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Co-pending U.S. Appl. No. 09/494,395, entitled Engine Idle Control System, filed on Jan. 31, 2000 in the name of Isao Kanno et al. and assigned to Sanshin Kogyo Kabushiki Kaisha.
Co-pending U.S. Appl. No. 10/078,275, entitled Control System for Marine Engine, filed on Feb. 14, 2002 in the name of Isao Kanno and assigned to Sanshin Kogyo Kabushiki Kaisha.
Corrigan Jaime
Denion Thomas
Yamaha Marine Kabushiki Kaisha
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