Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1982-07-30
1985-04-09
Witkowski, Stanley J.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318603, 361 96, G05B 2302, H02H 3027
Patent
active
045104263
ABSTRACT:
An improved electronic controller for an automobile power seat system is disclosed. The electronic controller features a microcomputer which receives command signals from a first and second group of operator actuable switches, present position signals from a monitoring circuit, and stored position signals from a memory circuit for generating control signals for directing a motive power means to adjust the position of an automobile seat. The monitoring circuit includes transducer means for sensing the current draw from the d.c. power source, and differentiating means connected to the transducer means for generating a pulse concomitantly with each commutation of the motor from the motive power means. These pulse position signals are sent to the microcomputer and then counted by an internal timer for determining the present position of the automotive seat. These pulse position signals are used to determine a "stall" condition which occurs when the rack mechanism has encountered a mechanical stop, such as when the seat reaches its full forward position. The time between these pulses is monitored and a stall condition is determined when the time between these pulses exceeds a predetermined period.
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Richard W. Kovener, National Semiconductor MOS Data Book, "Power Seat With Memory", May 1980, pp. 2-151-2-154.
Kaleita David L.
Michaels Paul A.
Keane Patrick C.
Lectron Products, Inc.
Witkowski Stanley J.
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