Internal-combustion engines – Starting device – For airplane
Patent
1974-12-26
1977-07-05
Dority, Jr., Carroll B.
Internal-combustion engines
Starting device
For airplane
123198D, 180103R, F02N 1700
Patent
active
040333116
ABSTRACT:
An ignition system of an internal combustion engine is provided with a hazardous-start inhibiting interlock that prevents the engine from being started unless an associated engine clutch, transmission, brake or similar device is placed in a safe condition for starting. The ignition system has a spark plug, a secondary winding of an ignition transformer connected to the plug to provide a sparking potential and a source of low-tension current pulses supplied to the primary winding of the ignition transformer in timed relationship with the engine cycle. The hazaradous-start inhibiting interlock is connected between the pulse source and the primary winding of the ignition transformer, and at the time of engine starting the interlock blocks the flow of current pulses to the primary winding unless the clutch, transmission or other device is safely positioned so that the vehicle or other mechanisms powered by the engine cannot be set in motion. The inhibiting interlock comprises one or more serially connected safety switches which are closed to transmit pulses from the source only when the clutch, transmission or other device is in its safe condition. If any one of these safety switches is open, engine starting is inhibited. A silicon controlled rectifier (SCR) is connected in parallel with the safety switches to maintain the transmission of pulses after the engine powered device is placed in operation and the safety switches are open. The SCR is made responsive to current pulses transmitted through the primary winding of the ignition transformer and is held in its conductive state after starting by an RC circuit having a capacitor that is charged by the current pulses. When the engine is shut off, the capacitor discharges and the SCR returns to its non-conductive state inhibiting another engine start until the safety switches are again closed by placing the associated clutch or other device in a safe starting condition.
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patent: 3608285 (1971-09-01), Berk
patent: 3715004 (1973-02-01), Pasek et al.
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patent: 3718128 (1973-02-01), Botker
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patent: 3783216 (1974-01-01), Planer et al.
patent: 3789938 (1974-02-01), Hetteen
patent: 3914735 (1975-10-01), Guillaume
Devinsky Paul
Dority Jr. Carroll B.
R. E. Phelon Company, Inc.
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