Internal-combustion engines – Charge forming device – With fuel pump
Patent
1993-10-08
1994-11-15
Miller, Carl S.
Internal-combustion engines
Charge forming device
With fuel pump
123450, F02M 3704
Patent
active
053638247
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a fuel injection device for internal combustion engines.
More particularly, it relates to a fuel injection device which has a high pressure pump drawing fuel via a suction valve into a pump working space and delivering via a delivery valve the pressurized fuel into a high pressure reservoir, with a pressure control device which maintains the pressure to a definite value and a distributor driven synchronously with the engine and successively driving injection lines which lead to injection valves, and a first electrically controlled valve in a fuel line leading to the high pressure reservoir.
Such a fuel injection device is known from the U.S. Pat. No. 4,964,389 and the corresponding DE-A-38 43 467, in which a specified amount of fuel is metered via the electrically controlled valve in the fuel line leading away from the reservoir into an intermediate reservoir, the outlet of which can be linked with the distributor aperture via a second electrically controlled valve. The amount of fuel fed via the first electrically controlled valve to the intermediate reservoir which is pressurised by the injection pressure made available by the high-pressure reservoir is measured by the stroke of a reservoir piston which limits the intermediate reservoir, and the opening period of the first electrically controlled valve is correspondingly determined by a control device. The first electrically controlled valve thus controls the amount of fuel injected. The second electrically controlled valve is opened at the desired instant for injection, and the fuel stored by the intermediate reservoir is supplied to the relevant injection nozzle.
In this procedure, the second electrically controlled valve determines the injection timing. This device is rather elaborate in that it requires a high-pressure intermediate reservoir in addition to two electrically controlled valves.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a fuel injection device for internal combustion engines, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a fuel injection device of this type, in which upstream of the first electrically controlled valve, a second electrically controlled valve is provided in a relief line connected to the distributor aperture, and for the purpose of controlling the injection time and volume the injection start is determined by opening the first electrically controlled valve while the second electrically controlled valve is closed, and the injection termination is determined by opening the second electrically controlled valve.
When the fuel injection device is designed in accordance with the present invention, it has advantage that it is constructed very simply with as few structural elements as possible.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a first embodiment example with a radial piston distributor pump as a pressure generator and as a device for controlling several fuel injection valves which are supplied with fuel from a high-pressure reservoir, and FIG. 2 shows a second embodiment example with a modified design of a pressure control device of the high-pressure reservoir of the first embodiment example.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows a partial section through parts of a high-pressure pump of the type of a radial piston distributor injection pump. In this example, a distributor piston 2 is driven in a bore 3 by a rotary drive which is not
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Miller Carl S.
Robert & Bosch GmbH
Striker Michael J.
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