Patent ID: 6648706
Filing Date: 2003-11-18
Classification: F02B

Abstract:
A planing-type watercraft comprising a hull, a propulsion device arranged to propel the hull, an internal combustion engine driving the propulsion device, the engine comprising an engine body, at least one moveable member moveable relative to the engine body, the engine body and the moveable member together defining at least one combustion chamber, an air intake system configured to guide air to the combustion chamber, the intake system including a throttle valve, the throttle valve moveable generally between a closed position and an open position, a fuel injection system configured to inject fuel for combustion in the combustion chamber, an intake pressure sensor, a throttle position sensor, an engine speed sensor, and a control device configured to control an amount of the fuel using either a first control mode or a second control mode, the first control mode being based upon a signal from the intake pressure sensor and a signal from the engine speed sensor, the second control mode being based upon a signal from the throttle position sensor and the signal from the engine speed sensor, the control device using the first control mode when either an opening of the throttle valve is relatively small or when an engine speed is relatively low, the control device using the second control mode when either the opening of the throttle valve is relatively large and when the engine speed is relatively high, the controller being further configured to use only the first control mode for all engine speeds if the throttle position sensor malfunctions and to use only the second control mode for all engine speeds if the intake pressure sensor malfunctions.