Fuel injection valve and fuel injection device
AssigneesDenso Corporation, Nippon Soken, Inc.
InventorsJun Kondo, Tooru Taguchi, Fumiaki Arikawa, Daiji Ueda, Akitoshi Yamanaka
Life of this patent
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Abstract
It is equipped with an injector body 4z which has formed therein high-pressure paths 6az, 6bz, and 6cz through which high-pressure fuel flows to a spray hole and stores therein a piezo-actuator 2z (i.e., an opening/closing mechanism) and a back-pressure control mechanism 3z (i.e., an opening/closing mechanism) which open or close the spray hole, and a fuel pressure sensor 50z installed in the body 4z to measure the pressure of the high-pressure fuel. The body 4z has formed therein a branch path 6ez diverging from the high-pressure paths 6bz and 6cz to deliver the high-pressure fuel to the fuel pressure sensor 50z.
Claims11
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 an electrically-driven opening/closing mechanism for opening or closing said spray hole;
- and
- a fuel pressure sensor installed in said body to measure a dynamic pressure of said high-pressure fuel which is changed by spraying of the fuel from the spray hole, and wherein
- a branch path is formed in said body which diverges from said high-pressure path to deliver said high-pressure fuel, which is changed in pressure dynamically by the spraying of the fuel from the spray hole, to said fuel pressure sensor at all times while the fuel is being sprayed, and wherein said opening/closing mechanism is controlled based on an output of the fuel pressure sensor.
A fuel injection device comprising:
- a fuel path to which high-pressure fuel is supplied externally;
- a spray hole which connects with said fuel path and sprays at least a portion of the high-pressure fuel;
- a branch path which connects with said path at a turned angle of 90° or more to a flow of the fuel in said fuel path;
- a diaphragm which is made of a thin wall in said branch path and which is exposed to the high-pressure fuel at all times while the high-pressure fuel is being sprayed, and strains and displaces when subjected to a dynamic pressure of said high-pressure fuel which is changed by spraying of the fuel from the spray hole;
- and
- displacement sensing means for converting a displacement of said diaphragm into an electric signal.
Dependencies are inferred from the claim text.