Fuel injection device

• US 8,899,202 B2
• Filed: 02/10/2011
• Issued: 12/02/2014
• Est. Priority Date: 02/16/2010
• Status: Expired due to Fees

• Current Assignee: Zama Japan Kabushiki Kaisha
• Original Assignee: Zama Japan Kabushiki Kaisha
• Inventors: Nonaka, Takumi, Watanabe, Hideki
• Primary Examiner(s): Moulis, Thomas
• Assistant Examiner(s): DALLO, JOSEPH J
• Application Number:
  US13/024,894
• Publication Number:
  US 20110197857A1
• Time in Patent Office: 1,391 Days
• Field of Search: 123/73.AF, 123/179.28, 123/178.29, 123/438, 123/472, 123/475, 123/478, 123/457, 701/103, 701/105, 701/110
• US Class Current: 123/179.29
• 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 can 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 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.

2. 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.