Patent ID: 8899202

Claim:
A fuel injection device comprising electricity-generating means for generating electricity by the rotation of an engine and outputting a predetermined signal, and a solenoid valve for injecting fuel, the valve being opened as a result of a drive current being applied to a coil, and the fuel being injected into an intake passage of the engine at a predetermined timing during the rotation period of the engine, wherein: the electricity-generating means is an alternating-current generator having an electromotive coil at a predetermined position on the external periphery of a flywheel disposed on an engine shaft and provided with a magnet in an area along the edge; the electromotive coil is disposed at a predetermined position along the external periphery of the flywheel in a crank angle position at which an output signal is generated in synchronization with the intake timing of the engine; the output signal is an injection command signal applied without modification to the solenoid valve as an alternating-current drive current; and the applied voltage increases with increased engine speed, and wherein: a fuel flow-rate adjustment valve is provided to a fuel passage that extends to the solenoid valve or to a fuel passage that extends from the solenoid valve to the intake passage and linked to the throttle valve by a link mechanism; an intake passage having a throttle valve is configured as a through passage; the fuel flow-rate adjustment valve operates so as to increase the fuel flow rate in association with the opening operation of the throttle valve; and a per-cycle fuel injection rate increases with increased engine speed.