F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
317/5.4
F02P 3/04 (2006.01) F02P 1/08 (2006.01)
Patent
CA 1117181
ABSTRACT OF THE DISCLOSURE Disclosed herein is an engine ignition system comprising an eletronic switch including an anode, a cathode, and a control element, which switch is rendered conductive through the anode-cathode path in response to current flow through the control element-cathode path, an ignition coil including a primary winding connected in series with the anode, means for supplying current flow through the primary winding subject to conduction of the switch, a rotary pulse generator including a trigger coil connected to the control element and adapted to generate trigger voltage pulses and to provide trigger current pulses to the control element to render the switch conductive, and an active pulse discriminator for preventing false triggering of the switch and comprising an active filter circuit including a capacitor/resistor network comprising a blocking capacitor and resistor connected in parallel, which network has one end connected to the switch cathode and an opposite end, and which capacitor develops the blocking voltage when a trigger voltage pulse is applied to the network. The active filter circuit also includes current control means having a first terminal connected to the one end of the network, a second terminal connected to the opposite end of the network, and a third terminal connected to the trigger coil, which current control means is rendered conductive so that a trigger current pulse sufficient to render the switch conductive flows between the first and third terminals to the trigger coil and through the control element-cathode path when a trigger voltage pulse exceeds the blocking voltage and a control current is applied to the second terminal.
313252
Cavil David T.
Krueger William R.
Outboard Marine Corporation
Smart & Biggar
LandOfFree
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