Apparatus for governing the idling RPM of an internal combustion

Details Apparatus for governing the idling RPM of an internal combustion Apparatus for governing the idling RPM of an internal combustion

1996-06-28

1997-11-25

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02M 6932

Patent

active

056900708

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is based on an apparatus for governing the idling rpm of an internal combustion engine. Such an apparatus is already known (Development of air-assisted injector system, SAE (Society of Automotive Engineers), Technical Paper Series 920294, pp. 57/58, 1992), in which a first valve closing member controls a first valve opening cross section to a first flow line, and a second valve closing member controls a second valve opening cross section to a second flow line. This first flow line communicates with a fuel metering device of the engine and serves to supply an operating medium, in particular aspirated air, to the fuel metering device for the sake of air-assisted fuel injection. The second flow line communicates directly with an intake conduit of the engine downstream of a throttle valve disposed in the intake conduit. Via the second flow line, operating medium can be supplied to the intake conduit and from there likewise to the engine. The first and second valve closing members are adjustable by means of an electric motor adjusting device via an adjusting member in the valve opening direction, counter to the force of a valve closing spring; when the adjusting drive is not activated, the valve closing members are held by the valve closing spring in a valve closing position. The known apparatus has the disadvantage that because of the rotationally symmetrical embodiment of the valve openings and of the valve closing members cooperating with them, upon axial adjustment of the valve closing member in traversing an extremely short stroke path, practically the entire opening cross section is uncovered, so that purposeful uncovering of only a defined partial cross section can be accomplished technically only with great difficulty, especially if, as in the prior art discussed, two valve closing members are actuated by means of a single rodlike final control element. Moreover, a large amount of space is required along with major effort and expense for production and installation.


ADVANTAGES OF THE INVENTION

The apparatus according to the invention for governing the idling rpm of an internal combustion engine has the advantage over the prior art that a valve opening can be opened continuously, and until the attainment of a predetermined free flow cross section, with the aid of a valve slide that uncovers the associated valve opening beginning at a point on its peripheral region. This purposeful uncovering of a defined flow cross section can be accomplished without extreme demands for accuracy of the electric motor adjusting drive, since the valve slide, in the course of a linear motion, for instance, relative to the associated valve opening uncovers an increasingly larger area thereof, so that until the opening is fully opened a certain amount of throttle action is preserved.
In a feature of the invention, the possibility advantageously exists of adapting the shape of the opening and/or of the slide to the characteristic of the adjusting drive in such a way that a desired characteristic course of the uncovering of the flow cross section is attainable as a function of the actuation of the adjusting drive. In the apparatus of the invention the advantage is also attained that it is simple to manufacture and to install and also requires little space.
By means of the provisions recited, advantageous further features of and improvements to the apparatus of the invention are possible.


BRIEF DESCRIPTION OF THE DRAWING

The invention will be described in further detail below in conjunction with the drawings.
FIG. 1 illustrates a schematic illustration of a preferred arrangement of the valve devices of an apparatus according to the invention;
FIGS. 2-9c illustrate various preferred embodiments of apparatuses according to the invention.


DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

Before various exemplary embodiments of the invention are described in detail below, a preferred fundamental principle of an apparatus for governing the idling rpm of an internal combustion engine

REFERENCES:
patent: 4982760 (1991-01-01), Mustaklem
patent: 5170761 (1992-12-01), Kato et al.
patent: 5467749 (1995-11-01), Meiwes et al.
patent: 5564338 (1996-10-01), Meiwes et al.
Patent Abstracts of Japan, vol. 18, No. 691, (M-1731), Dec. 26, 1994, for JP 6-272645 (Kurita), Sep. 27, 1994.

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