Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1998-04-15
2000-04-18
Solis, Erick R.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
123399, F02D 910
Patent
active
06050241&
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a control device for controlling an output of a driving machine.
In a known control device (International Patent Application WO 88/02064), there is a control element for controlling the output of a driving machine. The control element takes the form of a throttle valve. The control element can be adjusted with the aid of a control device. If the control device should fail or is turned off, the control element is in a position of repose. The position of repose is dimensioned such that emergency operation of the driving machine is possible.
In the known control device, there is a restoring spring, which urges the control element in the direction of closure of the intake conduit. A second spring acting as an emergency operation spring urges the control element in the opening direction, until the control element reaches the position of repose. By means of a stop on which the second spring can come to rest, it is attained that the second spring can urge the control element only as far as the position of repose.
The known control device has the disadvantage of requiring one additional, powerful spring, which is disadvantageous in terms of the production cost and the structural size of the known control device.
ADVANTAGES OF THE INVENTION
The control device according to the invention for controlling an output of a driving machine has the advantage that the spring assembly can adjust the control element both from the direction of the first terminal position and from the direction of the second terminal position into the position of repose located between the two terminal positions. This reduces the number of springs required, thus advantageously markedly reducing the production cost and the structural space required.
By the provisions recited hereinafter advantageous further refinements of and improvements to the control device are possible.
If the control element and the intermediate member are supported rotatably or pivotably, and if the actions of the spring assembly occur in the form of torques, then advantageously by simple adaptation of the radii, the actions of the spring assembly can be adapted very simply.
If the speed-changing gear includes a transmission stage between the control element and the intermediate member or intermediate wheel, and this transmission stage increases the rpm of the control element in the direction of the intermediate member or intermediate wheel, then advantageously this transmission stage can also be jointly used as part of the change of the rpm of the control device to the angular speed of the control element.
If the second pivotable spring connection, or the suitably shaped end of the spring assembly that forms the second pivotable spring connection, comes to rest on the repose stop in the position of repose, then the number of components required is advantageously reduced still further.
If the repose stop is defined such that when the repose stop determines the position of the control element, the control element is in a position in which the driving machine is in emergency operation, this has the advantage that even if the control device should fail, emergency operation of the driving machine is possible. Nor can the throttle valve become firmly stuck in the gas conduit even if the driving machine has been turned off for a relatively long time.
If the control device is connected to the control element via the intermediate member, this has the advantage that to reduce the rpm of the control device to the control element, the transmission stage between the intermediate member and the control element can be jointly used.
If the joined spring assembly is used for axially tensing the throttle valve shaft, this has the advantage that the number of components required is additionally reduced markedly.
BRIEF DESCRIPTION OF THE DRAWINGS
Selected, especially advantageous exemplary embodiments of the invention are shown in simplified form in the drawing and described in further detail in the description below. FIGS. 1, 2, 3 and 6 symbolically
REFERENCES:
patent: 5141070 (1992-08-01), Hickmann et al.
patent: 5172667 (1992-12-01), Spiegel
patent: 5297521 (1994-03-01), Sasaki et al.
patent: 5492097 (1996-02-01), Byram et al.
patent: 5775292 (1998-07-01), Seeger
patent: 5812050 (1998-09-01), Figgins
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Solis Erick R.
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