| 摘要 |
A fuel supply and ignition control system for controlling the operation of pilot and main valves in an intermittent pilot type system. At the start of an ignition cycle, the pilot valve (12) is operated to supply fuel to a pilot outlet (13) for ignition by sparks generated cross a spark gap (63) and when a name bridges the spark gap, a name sensing network (24), connected in circuit with the spark electrodes (18, 19) generates a flame signal which causes an enabling circuit (20) to operate the main valve (14). The enabling circuit includes a switching device (30) which is enabled only when a flame signal is provided and causes a flame relay (R1) to operate and energize the main valve. In another embodiment, the switching device (41) is enabled in the absence of a flame signal and causes ans SCR device (18) to conduct and provide a low impedance energizing path for the pilot valve and a shunt path around the main valve, the switching device being disable when the name signal is provided, thereby causing the SCR device to interrupt the shunt path around the main valve allowing it to operate. |
