Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1984-10-24
1986-02-04
Focarino, Margaret A.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
431 12, 431 18, F23N 518
Patent
active
045682666
ABSTRACT:
Disclosed is a system for reaching and maintaining a desired fuel-to-air ratio in a combustion system. The system comprises apparatus for monitoring information related to fuel-to-air ratio. The system further comprises apparatus for waiting to adjust a set point of the fuel-to-air ratio until after the passage of a predetermined period of time following the onset of a particular flame-on period. The apparatus for waiting comprises apparatus for waiting again to adjust the set point of the fuel-to-air ratio as required only after the occurrence of either of the two following events, whichever occurs first: the passage of a predetermined period of time after the previous adjustment of fuel-to-air ratio; or the passage of a predetermined period of time following the onset of the flame-on period occurring subsequent to the flame-on period in which the fuel-to-air ratio was last adjusted. The apparatus for waiting again comprises apparatus for holding the set point established by the prior adjustment during flame-off time and during the time between adjustments so that flame-on time subsequent to the prior adjustment uses the prior set point, the apparatus for waiting again further comprising apparatus for repeating the steps carried out by the apparatus for waiting again as required to substantially reach and maintain the desired fuel-to-air ratio.
REFERENCES:
patent: 3947217 (1976-03-01), Graat et al.
patent: 4033712 (1977-07-01), Morton
patent: 4162889 (1979-07-01), Shigemura
patent: 4238185 (1980-12-01), Watson
patent: 4260363 (1981-04-01), Cratin
patent: 4348169 (1982-09-01), Swithenbank et al.
Focarino Margaret A.
Honeywell Inc.
Sumner John P.
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