F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/21
F23N 5/02 (2006.01) F23N 5/12 (2006.01) F23Q 3/00 (2006.01) F23Q 9/14 (2006.01)
Patent
CA 1156326
FUEL SUPPLY AND IGNITION CONTROL SYSTEM EMPLOYING FLAME SENSING VIA SPARK ELECTRODES Abstract: A fuel supply and ignition control system for con- trolling the operation of pilot and main valves in an intermittent pilot type system. At the start of an igni- tion cycle, the pilot valve is operated to supply fuel to a pilot outlet for ignition by sparks generated by a spark generating circuit. When the pilot fuel is ignited, the pilot flame bridges the spark gap, and a flame sensing network, which is connected in circuit with the spark electrodes, generates a flame signal which is applied to an enabling circuit which responsively effects operation of the main valve. The enabling circuit includes a con- trollable switching device which in one embodiment, is maintained disabled in the absence of a flame signal and is enabled to cause a flame relay to operate and ener- gize the main valve when a flame signal is provided. In another embodiment, the controllable switching device is enabled in the absence of a flame signal and causes an SCR device to conduct, providing a low impedance energizing path for the pilot valve operate winding and a shunt path around the main valve operate winding. When a flame bridges the spark gap, the flame signal disables the switching device so that the SCR device is rendered non-conducting, interrupting the shunt path amount the main valve winding allowing the main valve to operate.
366200
Johnson Controls Inc.
Osler Hoskin & Harcourt Llp
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