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Piezoelectric low-pressure fuel injector
| Details |
Inventors: Igashira, Toshihiko; Sakakibara, Yasuyuki; Abe, Seiko; Takigawa, Masahiro; Izawa, Akihiro;
Assignee: Nippon Soken, Inc. (Nishio, JP)
Primary Examiner: Peters, Jr.; Joseph F.
Assistant Examiner: Burkhart; Patrick N.
Attorney, Agent or Firm: Cushman, Darby & Cushman
A piezoelectric fuel injector for use in fuel injection systems of spark-ignition engines is provided with a normally closed valve assembly in the form of a reed valve. The valve assembly includes a valve plate having one or more outlet ports having an overall cross-sectional flow area sufficient to ensure an unobstructed flow path therethrough. The valve assembly also includes a generally flat, thin, resilient closure member cooperating with the valve set of the valve plate. The pressure wave created in the fuel in the pumping chamber upon excitation of the piezoelectric actuator propagates into the outlet ports to directly reach the thin closure member, which readily resiliently yields to permit a desired amount of fuel to be injected into the engine cylinders. The fuel injector is particularly suitable to be operated by a high-frequency drive signal in order to ensure precise metering of fuel quantity over a wide range of engine operating conditions. |
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DETAILED DESCRIPTION The general object of the present invention is to eliminate the aforementioned disadvantages.
The primary object of the present invention is to provide a piezoelectric fuel injector particularly suitable to be operated at a high frequency yet perform a precise metering function.
Another object of the present invention is to provide a piezoelectric fuel injector capable of delivering a predetermined precise amount of fuel in each injection stroke throughout a wide range of frequencies of operation.
Still another object of the present invention is to provide a piezoelectric fuel injector capable of atomizing the injected fuel to a profound degree.
This invention is based on the discovery that the irregularity in the quantity of fuel injection experienced in the fuel injector of Williams during high-frequency operation is due to secondary, tertiary, or subsequent injections taking place upon each excitation of the piezoelectric drive.
That is, since the horn is tapered toward a narrow outlet, the quantity of fuel delivered out of the injector on the initial pressure rise in each pumping stroke of the piston is limited so that part of the shock wave produced by the sudden movement of the piston is reflected by the horn and pintle valve back to the piston, where it is reflected again toward the horn, thereby causing secondary, tertiary, and subsequent pressure rises, resulting in the additional irregular fuel injection.
According to the invention, the problem of secondary or subsequent injections is solved by the feature that the valve mechanism is made sufficiently yieldable to deliver the required quantity of fuel in response to the first pressure rise.
More specifically, the control valve for closing the outlet of the injector is made in the form of a reed valve.
The reed valve includes a valve plate secured to the injector body in close proximity of the piston actuated by the piezoelectric drive.
The valve plate is provided with one or more outlet ports extending parallel to the direction of movement of the piston and being in a direct fluid communication with the pumping chamber defined in the injector body
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