Fail-safe circuit for a control system

Details Fail-safe circuit for a control system Fail-safe circuit for a control system

1985-04-18

1988-04-19

Harkcom, Gary V.

Boots, shoes, and leggings

36443111, 371 9, G06F 1100

Patent

active

047394692

ABSTRACT:
A highly reliable, fail-safe circuit for a control system wherein a controlled device will always receive a control signal derived from a main control circuit when the main control circuit operates normally even if a back-up control circuit backing up at least one function of the main control circuit which is a minimum requirement for an operation of the controlled device fails or wherein a controlled device will receive a control signal derived from the back-up control circuit when the main control circuit fails. Replacement of the control signal from the main control circuit with a back-up control signal from the back-up circuit is carried out only when the back-up circuit outputs a particular signal at or near a predetermined frequency or alternatively when the back-up circuit outputs a plurality of parallel logical signals in a predetermined combination.

REFERENCES:
patent: 4386427 (1983-05-01), Hosaka
patent: 4532594 (1985-07-01), Hosaka et al.
patent: 4541050 (1985-09-01), Honda et al.
patent: 4580220 (1986-04-01), Braun et al.
patent: 4583176 (1986-04-01), Yamato et al.
patent: 4584645 (1986-04-01), Kosak
patent: 4587655 (1986-05-01), Hirao et al.
patent: 4594667 (1986-06-01), Yasuhara
patent: 4621322 (1986-11-01), Suzuki et al.

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