FUEL INJECTION VALVE AND FUEL INJECTION APPARATUS

• US 20100263633A1
• Filed: 10/27/2008
• Published: 10/21/2010
• Est. Priority Date: 11/02/2007
• Status: Abandoned Application

• Current Assignee: DENSO Corporation, Nippon Soken, Inc.
• Original Assignee: DENSO Corporation, Nippon Soken, Inc.
• Inventors: Fujino, Tomoki, Kondo, Jun, Yamanaka, Akitoshi, Taguchi, Tooru, Arikawa, Fumiaki
• Application Number:
  US12/741,111
• Publication Number:
  US 20100263633A1
• Time in Patent Office: Days
• US Class Current: 123/478
• CPC Class Codes: F02D 41/2096 for controlling piezoelectric injectors drive and control circuit for piezoelectric devices in general H10N30/802
• CPC Class Codes: F02M 2200/24 Fuel-injection apparatus with sensors
• CPC Class Codes: F02M 47/027 Electrically actuated valves draining the chamber to release the closing pressure
• 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 57/005 the devices being sensors
• CPC Class Codes: F02M 63/0026 using piezoelectric or magnetostrictive actuators

Abstract

The injector body 4z which forms therein the high-pressure paths 6az, 6hz, and 6cz through which high-pressure fuel flows to a spray hole and has disposed therein the piezo-actuator 2z (drive means) to drive a needle (valve) to open or close the spray hole, the fuel pressure sensor 50z which is installed in the body 4z to measure the pressure of the high-pressure fuel, the sensor terminals 55z to output a measured pressure value from the fuel pressure sensor 50z externally, the drive terminals 56z to which the electric power for the piezo-actuator 2z is supplied, and the connector housing 70z retaining the sensor terminals 55z and the drive terminals 56z are provided. The sensor terminals 55z, the drive terminals 56z, and the connector housing 70z constitute a single connector.

Claims

1. A fuel injection valve which is to be installed in an internal combustion engine to spray fuel from a spray hole, comprising:

a body in which a high-pressure path is formed through which high-pressure fuel flows to said spray hole and has disposed therein drive means for driving a valve to open or close said spray hole;

a fuel pressure sensor installed in said body to measure pressure of said high-pressure fuel;

a sensor terminal connected to said fuel pressure sensor through a wire to output a pressure-measured value from said fuel pressure sensor externally;

a drive terminal connected to said drive means through a wire to supply electric power to said drive means; and

a connector housing retaining said sensor terminal and said drive terminal, characterized in that

said sensor terminal, said drive terminal, and said connector housing constitute a single connector.

2. A fuel injection valve as set forth in claim 1, characterized in that said sensor terminal and said drive terminal are unified by a molded resin and retained by said connector housing.

3. A fuel injection valve as set forth in claim 1, characterized in that it is equipped with a memory chip storing therein a correction value for the measured pressure value and a memory terminal connected to said memory chip through a wire to output said correction value from said memory chip, and in that said memory terminal is retained by said connector housing to constitute said connector.

4. A fuel injection valve as set forth in claim 3, characterized in that said sensor terminal, said drive terminal, and said memory terminal are unified by a molded resin and retained by said connector housing.

5. A fuel injection valve as set forth in claim 3, characterized in that it includes a ground terminal to which a ground wire of said fuel pressure sensor and a ground wire of said memory chip are connected, and in that said ground terminal is retained by said connector housing to constitute said connector.

6. A fuel injection valve as set forth in claim 5, characterized in that said sensor terminal, said drive terminal, said memory terminal, and said ground terminal are unified by a molded resin and retained by said connector housing.

7. A fuel injection valve as set forth in claim 1, characterized in that said connector is so secured to said body that a drive wire connecting said drive terminal and said drive means and said fuel pressure sensor are disposed inside said connector housing, and in that a sealing member is provided to seal between said connector and said body to seal said drive wire and said fuel pressure sensor from outside said connector housing.

8. A fuel injection valve as set forth in claim 7, characterized in that said connector is attached to an end surface of a cylindrical portion of said body, and in that said sealing member seals between said connector and said body at an outer peripheral surface of said cylindrical portion.

9. A fuel injection valve as set forth in claim 7, characterized in that said connector is attached to an outer peripheral surface of said cylindrical portion of said body, and in that aid sealing member seals between said connector and said body at an outer peripheral portion of said cylindrical portion.

10. A fuel injection valve as set forth in claim 1, characterized in that an amplifier which amplifies an electric signal that is the measured pressure value outputted from said fuel pressure sensor is mounted inside said connector housing.

11. A fuel injection system comprising:

a fluid path to which high-pressure fluid is supplied externally;

a spray hole connected to said fluid path to spray at least a portion of said high-pressure fuel;

a branch path diverging from said fluid path;

a diaphragm connected to said branch path, said diaphragm being to be displaced at least partially by pressure of said high-pressure fuel exerted thereon;

displacement measuring means which measures a displacement of said diaphragm;

a nozzle needle which opens or closes said spray hole; and

an actuator which controls movement of said nozzle needle in an axial direction of an injector body, characterized in that

a terminal pin through which a signal to said actuator is inputted and a terminal from which a signal from said displacement measuring means is outputted are formed integrally with a common connector.