Abstract: An engine unit of an outboard motor comprises an engine body, a crank case in which a crankshaft is vertically perpendicularly arranged in a usable mounted state of the outboard motor, a cylinder block which is disposed to a rear side of the crank case and in which cylinders are arranged, a cylinder head disposed to a rear side of the cylinder block, a magnet device mounted to a top end portion of the crankshaft projecting upward and comprising a stator and a flywheel to which a rotor is integrally formed. In the engine unit, the crankshaft is supported by a bearing boss disposed to a mating portion of the cylinder block and the crank case through a bearing means and an oil seal is disposed between the bearing boss and the bearing means, and the magnet device is mounted to the engine body through the stator through a mounting portion. A diameter of the mounting portion of the stator is to be larger than an outer diameter of the oil seal.

Abstract: An outboard motor comprises an engine holder, an engine disposed above the engine holder in a mounted usable state of the outboard motor, the engine being an in-line multi-cylinder type and comprising a crankcase in which a crankshaft extends vertically perpendicularly, a cylinder block disposed rear side of the crankcase, and a cylinder head disposed rear side of the cylinder block, an oil pan disposed below the engine holder, an electrical equipment, and an electrical equipment holder having an electrical equipment holding portion for holding the electrical equipments. The electrical equipment holder is mounted to the engine through a fixing portion, and the electrical equipment holding portion and the fixing portion are integrally formed of an elastic material.

Abstract: An outboard motor generally comprises an engine holder, an engine disposed above the engine holder, an oil pan disposed below the engine holder, and an engine cover covering the engine holder, the engine and the oil pan so as to define a space between the engine and the engine cover. The engine includes a crankcase in which a crankshaft extends vertically perpendicularly in a usable state of the outboard motor, a cylinder block disposed rear side of the crankcase, a cylinder head disposed rear side of the cylinder block, an intake unit disposed to one surface side of the engine, an exhaust unit disposed to another one surface side thereof and arranged so as to project outward from the another one surface side of the engine as an exhaust projection portion, and an electrical equipment part.

Abstract: An engine management system stores the operating time when a warning about the engine occurs, and stores the operating time when the warning is cancelled and stores various engine information at the occurrence of a warning or from the occurrence of a warning to the end of the warning.

Abstract: In the engine control device, a reference crank angle and the rotational angle of the crank is detected. Based on the rotational frequency of the crank, which has been determined from the detected rotational angle of the crank, time from the reference crank angle to the target crank angle is estimated. Variations in the crank rotation are detected and stored. Based on the stored rotational variations, the periodicity of the rotational variations is detected. Based on the periodicity of the rotational variations, the estimated time from the reference crank angle to the target crank angle is corrected. Based on the thus obtained corrected time, an engine control signal corresponding to the target crank angle is output.

Abstract: An engine generally performs compression, explosion, exhausting and scavenging strokes sequentially, and includes an engine driving control apparatus including a detector for detecting a position of an explosion stroke, a detector for detecting instantaneous rotation speed of the crankshaft, and a control unit which receives input from the explosion stroke position detector and the rotation speed detector. The control unit performs the steps of judging a combustion state from an increasing rate of a rotation speed of the crankshaft in each explosion stroke, intentionally increasing or reducing an amount of fuel injection, calculating variation in said combustion state and correcting said amount of fuel injection so as to enhance the combustion state.

Abstract: The present invention is to provide an electronically controlled fuel injection type two-stroke engine wherein the intake air amount can be determined with precision so that the fuel injection amount can be properly controlled in conformity with the varying conditions of the exhaust pressure, to thereby achieve an optimal air-fuel ratio and hence improve the output power, the fuel consumption and the exhaust performance.For the computation of the correction value to the fuel injection amount based on the intake passage pressure, the actual throttle opening and engine speed are detected, and the intake pressure value P is detected at the same time. Then the corresponding basic intake pressure value is selected from the basic intake pressure map so as to calculate the difference between the basic intake pressure value and the detected intake pressure value.

Abstract: A structure for mounting control sensors in an engine of an outboard motor permits a reduced number of components for attaching control sensors, a higher degree of freedom for laying out the parts constituting the engine, efficient wiring, further improved vibration insulating properties, and use of a throttle body employed for an engine of other equipment than the outboard motor. A discrete sensor mounting holder, as a single unit, which is composed of a vibration-proof member and which holds an intake air temperature detecting sensor and an atmospheric pressure detecting sensor, respectively, is fixed to an engine of the outboard motor, the engine being provided with a fuel injecting unit and the intake air temperature detecting sensor and the atmospheric pressure detecting sensor for controlling the fuel injecting unit.