Abstract: A fuel supply apparatus having a fuel tank, throttle body, and fuel injection device configured integrally. The fuel injection device is positioned between the fuel tank and throttle body. The fuel injection device is a pressure-type fuel injection device that injects the fuel by pumping the fuel by reciprocative movement of a plunger. The fuel injection device injects the fuel located in the fuel tank into the intake passage of the throttle body on the basis of a signal from an Electronic Control Unit (ECU).

Abstract: A fuel injection method is provided for correcting the fuel injection amount accurately by eliminating offset components when detecting a current flowing through a solenoid for fuel injection. A current component, which is detected during normal running and a drive current flowing through the solenoid for fuel injection is OFF (Step 11), is input to an A/D converter that stores the value thereof (Step 12). Thereafter, the drive current is turned ON (Step S13), elapse of a fixed time period is waited (Step S14), and an input voltage of the A/D converter is detected (Step S15). A difference current (offset component) is calculated by subtracting the offset voltage from the input voltage (Step S16), and a current span is adjusted based on a span correction factor (Step S17). Thereafter, a pulse width current correction factor is calculated (Step S2a) and, based on the pulse width current correction factor, a drive pulse width is calculated (Step S2b) and provided to the solenoid.

Abstract: In a solenoid driving device of the type in which energy stored in a capacitor is used for re-driving of the solenoid, the generation of heat in a current back-flow preventing circuit preventing the back-flow of current to a power supply terminal is suppressed, and the generation of heat in a rectifying element through which the current that flows to the capacitor passes is suppressed. Electric power accumulated in the solenoid when the driving of the solenoid is stopped is temporarily stored in the capacitor, and a high voltage that is generated by the charging utilizing the peak voltage of the capacitor is utilized as the power supply for a discharge control circuit that controls the discharge of the capacitor. The current back-flow preventing circuit is constructed from a switching element such as an FET so that the generation of heat in this circuit is suppressed.

Abstract: A fuel injection method is provided for correcting the fuel injection amount accurately by eliminating offset components when detecting a current flowing through a solenoid for fuel injection. A current component, which is detected during normal running and a drive current flowing through the solenoid for fuel injection is OFF (Step 11), is input to an A/D converter that stores the value thereof (Step 12). Thereafter, the drive current is turned ON (Step S13), elapse of a fixed time period is waited (Step S14), and an input voltage of the A/D converter is detected (Step S15). A difference current (offset component) is calculated by subtracting the offset voltage from the input voltage (Step S16), and a current span is adjusted based on a span correction factor (Step S17). Thereafter, a pulse width current correction factor is calculated (Step S2a) and, based on the pulse width current correction factor, a drive pulse width is calculated (Step S2b) and provided to the solenoid.

Abstract: In a solenoid driving device of the type in which energy stored in a capacitor is used for re-driving of the solenoid, the generation of heat in the current back-flow preventing circuit that prevents the back-flow of current to the power supply terminal is suppressed, and the generation of heat in the rectifying element through which the current that flows to the capacitor passes is also suppressed. Electric power that is accumulated in the solenoid when the driving of the solenoid is stopped is temporarily stored in a capacitor, and a high voltage that is generated by the charging utilizing the peak voltage of the capacitor is utilized as the power supply for a discharge control circuit that is used to control the discharge of this capacitor. A current back-flow preventing circuit is constructed from a switching element such as an FET or the like, so that the generation of heat in this circuit is suppressed.

Abstract: A power supply unit for an internal combustion engine capable of more stably providing drive power to a control circuit of the internal combustion engine and capable of more rapidly starting up the control circuit.

Abstract: A power supply unit for an internal combustion engine capable of more stably providing drive power to a control circuit of the internal combustion engine and capable of more rapidly starting up the control circuit.