Electromagnetic fuel injection apparatus, an internal combustion engine having an electromagnetic fuel injection apparatus, and a drive circuit of an electromagnetic fuel injection apparatus

• US 6,550,458 B2
• Filed: 11/02/2001
• Issued: 04/22/2003
• Est. Priority Date: 12/25/1998
• Status: Expired due to Fees

• Current Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Original Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: Okamoto, Yoshio, Takahata, Toshio, Kadomukai, Yzo, Yamakado, Makoto, Hamada, Yasunaga, Tabuchi, Kenji, Tanabe, Yoshiyuki, Kubo, Hiromasa
• Primary Examiner(s): Wolfe, Willis R.
• Assistant Examiner(s): Gimie, Mahmoud
• Application Number:
  US09/985,302
• Publication Number:
  US 20020056443A1
• Time in Patent Office: 536 Days
• Field of Search: 123/490, 123/472, 123/478, 123/480, 123/482, 251/129.01, 251/129.09, 251/129.1, 251/129.15, 361/154, 361/210
• US Class Current: 123/490
• CPC Class Codes: F02D 2041/2003 using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
• CPC Class Codes: F02D 2041/2013 by using a boost voltage source
• CPC Class Codes: F02D 2041/2017 using means for creating a boost current or using reference switching
• CPC Class Codes: F02D 2041/2027 Control of the current by pulse width modulation or duty cycle control
• CPC Class Codes: F02D 2041/2051 using voltage control
• CPC Class Codes: F02D 2041/2079 the circuit having several coils acting on the same anchor
• CPC Class Codes: F02D 2400/16 Adaptation of engine control systems to a different battery voltages, e.g. for using high voltage batteries
• CPC Class Codes: F02D 41/20 Output circuits, e.g. for controlling currents in command coils
• CPC Class Codes: F02M 51/005 Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
• CPC Class Codes: F02M 51/0621 acting on one mobile armature F02M51/0628 takes precedence

Abstract

Using a control coil having a high response characteristic suited to the valve opening and a hold coil suited to a hold to be held a large force by a small large current, during the valve opening time a high voltage is applied to the control coil suited to the valve opening and during a valve opening hold time a low and stabilized voltage is applied to the hold coil suite to the holding, and then a valve body driven. In a fuel injection apparatus, a drive manner during a valve opening time and a hold time is optimized.

Claims

1. An electromagnetic fuel injection apparatus comprising an electromagnetic fuel injector and a drive circuit for driving said electromagnetic fuel injector, said electromagnetic fuel injector having at least two coils which produce a different time change rate of magnetomotive force, and wherein, to said at least two coils, a different voltage is applied via said drive circuit, each of said at least two coils being coupled to a respective power supply having a different voltage, said drive circuit including a diode for preventing a reverse flow.

2. The electromagnetic fuel injection apparatus according to claim 1, wherein said drive circuit further includes a first coil module coupled to a first one of said at least two coils and a second coil module coupled to a second one of said at least two coils.

3. The electromagnetic fuel injection apparatus according to claim 2, wherein said diode is coupled between said first coil module and said first one of said two coils.

4. The electromagnetic fuel injection apparatus according to claim 3, wherein said diode prevents reverse flow from said first coil module to said first one of said two coils.

5. An electromagnetic fuel injection apparatus comprising an electromagnetic fuel injector and a drive circuit for driving said electromagnetic fuel injector, said drive circuit including a diode for preventing reverse flow, said electromagnetic fuel injector having at least two coils to produce different time change rates of magnetomotive force, and wherein said drive circuit applies a different voltage to said at least two coils, each of said at least two coils being coupled to a respective power supply having a different voltage.

6. The electromagnetic fuel injection apparatus according to claim 5, wherein said drive circuit further includes a first coil module coupled to a first one of said at least two coils and a second coil module coupled to a second one of said at least two coils.

7. The electromagnetic fuel injection apparatus according to claim 6, wherein said diode is coupled between said first coil module and said first one of said two coils.

8. The electromagnetic fuel injection apparatus according to claim 7, wherein said diode prevents reverse flow from said first coil module to said first one of said two coils.