Tracking detection system of electrical servomotors

Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features

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Details

318601, 318603, 318636, 364187, G05B 902

Patent

active

059777354

DESCRIPTION:

BRIEF SUMMARY
STATE OF THE TECHNOLOGY

The invention is based on a follow-up detection of electric adjusting motors with incremental position detection, in particular for adjusting motors in motor vehicles.
The European Published Patent Application No. 0 603 506 A2 discloses a method for determining the position of a motor vehicle part with electromotive activation in two direction. During the movement of the part in both its directions, counting pulses of a position indicator are entered into a counter for reducing or increasing the count in accordance with the predetermined movement. Following the shut-down of the drive motor, the pulses supplied by the position indicator are analyzed as to their distance in time from the point in time for shut-down and are assigned to a further movement of the counter, provided the time distance between pulses does not exceed a predetermined value. During a pole reversal of the drive motor, the counting direction is not assigned to the new movement direction until the distance between the pulses decreases again following the pole reversal.
This known method does not provide information concerning the measures that allow a follow-up detection in case of undervoltage conditions and the simultaneous saving of supply energy for the position detection and evaluation.


SUMMARY AND ADVANTAGE OF THE INVENTION

In contrast, the follow-up detection according to the invention of electric adjusting motors, has the advantage of saving current during the incremental position detection and position evaluation that is used, so that in the case of undervoltage conditions, the buffer capacity for the motor electronics can be selected to be small and, if necessary, can be installed easier therein.
In accordance with the invention, this is basically achieved in that a microcontroller with A7 automatic prompt device is provided for the position detection, which can be switched from an active operating mode to an inactive operating mode in order to reduce the average current consumption and can switch back again automatically to the active operating mode, following a time interval that can be predetermined, that the microcontroller polls the position signals of position indicators at specific sampling instants, that between the necessary sampling instants, the microcontroller is switched to the inactive operating mode for a specific, calculated time interval, and that the specific, calculated time interval is calculated starting with a detected edge change of the position signal.
Advantageous modifications and improvements of the follow-up detection described above are possible with other described features of the invention set forth in the additional claims.
In accordance with a first, advantageous embodiment of the invention, it is provided that the specific, calculated time interval during which the microcontroller is in the inactive operating mode, can be calculated starting with any detected edge change of the position signal, wherein it is taken into account that the position signal interval, determined through polling technology, can be smaller by one sampling interval than the actual value owing to the discrete-time sampling.
A useful modification of this embodiment provides that the specific, calculated time interval during which the microcontroller is in the inactive operating mode, is calculated based on the following formula: when N.sub.HF .gtoreq.2 change of the Hall sensors used as position indicators; microcontroller is in the inactive operating mode; microcontroller is in the inactive operating mode, active operating mode;
According to a second, very advantageous embodiment of the follow-up detection according to the invention, the specific, calculated time interval during which the microcontroller is in the inactive operating mode is calculated such that starting with a first sampling instant and a first sampling interval, the following sampling instants are determined in such a way that the following sampling instants continue to double until an edge change of the position signal is det

REFERENCES:
patent: 5473533 (1995-12-01), Mengelt

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