Fail-safe system and method of operation

Details Fail-safe system and method of operation Fail-safe system and method of operation

1996-09-12

1998-08-04

Voeltz, Emanuel Todd

Boots, shoes, and leggings

364184, 364480, 364481, 39518221, 39518222, 39518504, 39518213, H02J 900

Patent

active

057904197

ABSTRACT:
A system is provided to automatically terminate a fail-safe state. When an abnormality detection signal of Lo and a pulse having a frequency outside a specified range are input to set and reset terminals S, R of an R-S Flip-Flop (R-SFF) 24, respectively, a microcomputer 14 is determined to be in its abnormal state and an output of Hi is output from a Q output terminal of the R-SFF 24 to stop the operation of a motor 20. In this way, a so-called fail-safe state is established. When the abnormality detection signal of Hi and the pulse having a frequency within the specified range are input to the set and reset terminals S, R of the R-SFF 24, respectively, the microcomputer 14 is determined to have returned to its normal state and an output of Lo is output from the Q output terminal of the R-SFF 24 to resume the operation of the motor 20. Thus, the operation of the motor 20 can be controlled according to the operation of a power window switch 16.

REFERENCES:
patent: 5042833 (1991-08-01), Kawabata
patent: 5049794 (1991-09-01), Okada et al.
patent: 5216938 (1993-06-01), Yamaguchi
patent: 5422808 (1995-06-01), Catanese, Jr. et al.
patent: 5510943 (1996-04-01), Fukunaga

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