Actuating means for a flap in motor vehicles

DETAILED DESCRIPTION I claim: 1.
An actuating mechanism for a flap in motor vehicles, having an electric step motor for adjusting the flap between two end positions fixed by limit stops, the flap being adjustable to a desired position corresponding to a regulating command, further comprising: means for transmitting a command signal to the step motor, the magnitude of the signal exceeding the magnitude which would be necessary to adjust the flap to a first one of said end positions; and wherein at the time of the initial switching-on of the mechanism, the means for transmitting transmits a said command signal to the step motor to adjust the flap to said first one of said end positions which is closest to the desired position and subsequently to adjust the flap to the desired position intermediate the two end positions.
2.
An actuating mechanism according to claim 1 wherein the means for transmitting serves to adjust the flap to a second one of said end positions by transmitting a signal, the magnitude of which exceeds the magnitude which would be necessary to adjust the flap to the second one of said end positions.




Description:
This invention relates to an actuating means for a flap in motor vehicles, having an electric motor adjusting the flap between two end positions fixed by limit stops in selectable desired positions corresponding to a regulating command.
The flap may, for example, be a throttle valve in the intake system of the internal-combustion engine or an air flap of a heating or air-conditioning unit.
It is known to provide such flaps within the framework of a servo system with a position indicator which reports the position of the flap back to a control device.
The position indicator may be contacting or non-contacting.
Both are known from DE-OS 31 10 949.
Actuating means of this type are high in cost with respect to components on the basis of the position indicator and with respect to regulating technology on the basis of the servo system.
The invention has the objective of providing an actuating means of the type initially mentioned which is clearly simplified in respect to components as well as to regulating technology