Timer circuit arrangement in digital combustion control system

Details Timer circuit arrangement in digital combustion control system Timer circuit arrangement in digital combustion control system

1979-08-29

1981-11-10

Yeung, James C.

Combustion

Timer, programmer, retarder or condition responsive control

Control of purger, of scavenger or of combustion start-up...

431 14, 431 51, F23N 500

Patent

active

042995566

ABSTRACT:
A timer circuit arrangement for use with a digital combustion control system functions to check failure of a safety timer which stops the combustion operation in the event that ignition is not completed within a predetermined time. The arrangement has a simple circuit which checks the safety timer in advance of initiation thereof. A pre-purge timer, which determines a predetermined time for feeding only combustion air into the combustion chamber for purge thereof in advance of the combustion, and the safety timer are built with a unitary construction. A series connection of flip-flop circuits is provided for carrying out frequency division of clock pulses to obtain predetermined times, and the flip-flop circuits for the safety timer are constituted by at least a part of the flip-flop circuits for the pre-purge timer so that the pre-purge may continue infinitely when the safety timer become out of order, thereby preventing the operation for combustion and ensuring safety of operation.

REFERENCES:
patent: 3549088 (1970-12-01), Obenhaus
patent: 3644074 (1972-02-01), Cade
patent: 3683372 (1972-08-01), Horn
patent: 4137035 (1979-01-01), Cade
patent: 4145179 (1979-03-01), Tanaka et al.

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