Device for controlling at least one throttle cross-section at a

Details Device for controlling at least one throttle cross-section at a Device for controlling at least one throttle cross-section at a

1989-11-01

1990-10-16

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123585, F02D 900

Patent

active

049627376

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a device for controlling a throttle cross-section of at least one control orifice in a bypass line of idling control of internal combustion engine, comprising a positioning motor for moving a throttle member and a return spring element for moving the throttle member to an initial position thereof. A device of this kind is already known (German Offenlegungsschrift No. 3,234,468). It has the disadvantage that in the event of the spring element being inoperative, for example because the spring element has broken, and the positioning motor being excited, or in the event of a malfunction in the electronic control device, the control orifice is opened completely by the throttle member, and the operation of the internal combustion engine is influenced in an undesirable manner or even endangered by running at too high a speed.


SUMMARY OF THE INVENTION

The object of the invention is a device that, in the event of an excitation of the positioning motor which leads to a position of the throttle member which is impermissible for the operating condition of the internal combustion engine, does not deliver a stream of operating medium which influences the operation of the internal combustion engine in an undesirable manner or put it at risk from running at too high a speed. The object of the invention is achieved by moving throttle member into a position in which, when the positioning motor is excited, the safety cross-section of the bypass line is such that smaller quantity of the operating medium flows therethrough per unit of time. A position of the throttle member which is impermissible for the operating condition of the internal combustion engine can occur in the event of the spring element being inoperative, for example a rupture of the spring element against which the positioning motor operates, and/or a malfunction in an electronic component of the control device used for controlling the positioning motor. The establishment of a safety cross-section of the bypass line has the effect of limiting the quantity of operating medium flowing per unit time so that the internal combustion engine can be operated without putting it at risk.
It is particularly advantageous to form the safety cross-section by a partial region of the control orifice and to open it by a control edge of the throttle member.
It is furthermore advantageous to move the throttle member beyond the position in which it closes the control orifice into the position which opens the safety cross-section.
The present invention as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiments when read with reference to the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the relationship between a diagram which shows the quantity of operating medium flowing through, per unit time Q, and the adjustment path s of the throttle member,
FIG. 2 shows a cross-sectional view along the line II--II in FIG. 3 of a device according to the present invention for controlling at least one throttle cross-section,
FIG. 3 shows a cross-sectional review along the line III--III in FIG. 2,
FIGS. 4a to d show a simplified representation of various positions of a throttle member having a throttle orifice with respect to a control orifice in a first embodiment of a device according to the invention,
FIGS. 5a to d show a simplified representation of the positions of a throttle member having a triangular throttle orifice with respect to a parallelogram-shaped control orifice in a second embodiment of a device according to the invention,
FIG. 6 shows a partial plan view of a device in accordance with FIGS. 2 and 3 and having a control orifice and a throttle orifice in accordance with FIGS. 5a to d, and
FIGS. 7a to d show a simplified representation of the positions of a throttle member designed with two throttle orifices with respect to two control orifices in a third em

REFERENCES:
patent: 4756286 (1988-07-01), Wietschorke et al.
patent: 4781161 (1988-11-01), Sausner et al.
patent: 4873954 (1989-10-01), Codling
patent: 4873955 (1989-10-01), McAuliffe, Jr.

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