FUEL INJECTION DEVICE

• US 20150128914A1
• Filed: 11/18/2014
• Published: 05/14/2015
• Est. Priority Date: 02/16/2010
• Status: Active Grant

• Current Assignee: Zama Japan Kabushiki Kaisha
• Original Assignee: Zama Japan Kabushiki Kaisha
• Inventors: Nonaka, Takumi, Watanabe, Hideki
• Granted Patent: US 9,581,117 B2
• Time in Patent Office: Days
• US Class Current: 123/490
• CPC Class Codes: F02D 2200/0404 Throttle position
• CPC Class Codes: F02D 2200/101 Engine speed
• CPC Class Codes: F02D 29/06 peculiar to engines driving electric generators
• CPC Class Codes: F02D 41/30 Controlling fuel injection F02D41/182, F02D41/24 take precedence
• CPC Class Codes: F02D 41/3005 Details not otherwise provided for
• CPC Class Codes: F02D 41/3082 Control of electrical fuel pumps
• CPC Class Codes: F02D 41/345 Controlling injection timing F02D41/365 takes precedence
• CPC Class Codes: F02M 51/061 using electromagnetic operating means
• CPC Class Codes: F02M 51/0678 all portions having fuel passages, e.g. flats, grooves, diameter reductions
• CPC Class Codes: F02M 51/08 specially for low-pressure fuel-injection

Abstract

A fuel injection device comprising electricity-generating means generating electricity by rotation of an engine and outputting a predetermined signal, and a solenoid valve injecting fuel; the valve being opened as a result of a drive current applied to a coil, and the fuel being injected into an intake passage of the engine at a predetermined timing during the rotation of the engine; to ensure that the flow rate required during high-speed operation ca be adequately provided in a fuel injection device for injecting/supplying fuel to an engine. The electricity-generating means is an alternating current generation means attached to the engine in a crank angle position at which an output is generated in synchronization with the intake timing of the engine; the signal is an injection command signal applied to the solenoid valve as an alternating-current drive current; and the applied voltage increases with increased engine speed.

Claims

1. A fuel injection device:

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 a engine at a predetermined timing during the rotation period of the engine, and

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 alternating-current generator generating electricity by the rotation of the engine and outputting a predetermined signal, 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 is generated in synchronization with the intake timing of the engine used, the signal is an injection command signal applied to the solenoid valve as an alternating-current drive current, and the applied voltage increases with increased engine speed.

2. The fuel injection device of claim 1, 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;

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

the per-cycle fuel injection rate increases with increased engine speed.

3. The fuel injection device of claim 1, wherein:

a fuel pump, operated by the introduction of a pulsating motion from the engine, is provided for pumping fuel to the solenoid valve; and

the fuel pump increases the discharge pressure as the engine speed increases.

4. The fuel injection device of claim 2, wherein:

a fuel pump, operated by the introduction of a pulsating motion from the engine, is provided for pumping fuel to the solenoid valve; and

the fuel pump increases the discharge pressure as the engine speed increases.

5. A fuel injection device:

a solenoid valve for injecting fuel, the valve being opened as a result of a drive current being applied to a coil, and

an alternating-current generator coupled to the solenoid valve, the alternating-current generator having an electromotive coil and a magnet, the electromotive coil is disposed on the external periphery of a flywheel disposed on an engine shaft and at a crank angle position at which an output is generated in synchronization with the intake timing of the engine used, the alternating-current generator generating electricity by the rotation of the engine and outputting a predetermined signal to the solenoid valve as an alternating-current drive current to inject fuel into an intake passage of the engine at a predetermined timing during the rotation period of the engine, wherein the applied voltage increases with increased engine speed.

6. The fuel injection device of claim 5, 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;

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

the per-cycle fuel injection rate increases with increased engine speed.

7. The fuel injection device of claim 5, wherein:

a fuel pump, operated by the introduction of a pulsating motion from the engine, is provided for pumping fuel to the solenoid valve; and

the fuel pump increases the discharge pressure as the engine speed increases.

8. The fuel injection device of claim 6, wherein:

a fuel pump, operated by the introduction of a pulsating motion from the engine, is provided for pumping fuel to the solenoid valve; and

the fuel pump increases the discharge pressure as the engine speed increases.