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US 3,941,111 AGranted
Ignition system
AssigneeSyncro S.R.L.
InventorsThomas F. Carmichael, Richard J. Maier
Life of this patent
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AssigneeSyncro S.R.L.
InventorsThomas F. Carmichael, Richard J. Maier
Estimating the term…
In one embodiment, a capacitive discharge ignition system has a charge coil and an ignition coil including primary and secondary windings wound on a common stator structure. The charge coil is coupled to the primary winding of the ignition coil by an SCR and a main capacitor such that the capacitor is first charged by the charge coil and then discharged through the SCR into the primary winding of the ignition coil when the SCR fires. During discharge of the capacitor, the charge coil also supplies current to the primary winding of the ignition coil. The SCR may be fired by a triggering circuit which includes a capacitor network connecting the gate of the SCR to the charge winding and main capacitor or through a breakdown effect of the SCR absent the provision of a triggering circuit. The circuit arrangement obviates the need for the usual charging diode between the charging coil and the main capacitor. Several embodiments of triggering circuit for the SCR are disclosed.
In a capacitor discharge ignition system the combination comprising a single charging and triggering coil, means for energizing said coil with a time-varying magnetic flux to thereby induce a time-varying voltage in said coil which voltage includes repetitive pulses of one polarity, an ignition coil comprising a primary winding and a secondary winding, a spark plug connected across said secondary winding, a capacitor, charging circuit means coupling said capacitor with said charging and triggering coil for causing said capacitor to be charged by said coil in response to an initial portion of each of said pulses, discharge circuit means operatively coupling said capacitor with said primary winding so that said capacitor can discharge into said primary winding to cause said spark plug to fire, said discharge circuit means including a solid state switch having first and second terminals via which terminals said capacitor discharges into said primary winding when said switch is actuated and a third terminal constituting a triggering terminal via which said switch is actuated in response to a triggering signal applied thereto, and triggering circuit means operatively coupled with said discharge means and with said single charging and triggering coil for causing said capacitor to discharge into said primary winding in response to a portion of each of said pulses occurring after said initial portion thereof, said triggering circuit means including a capacitor voltage dividing network connected to said coil with said third terminal connected to an intermediate point thereof, and a resistor connected in parallel with a portion of said capacitor voltage dividing network.
A capacitor discharge ignition circuit comprising a stator coil, means for energizing said coil with varying magnetic flux to thereby induce a time-varying voltage in said coil which voltage includes repetitive pulses of one polarity, an ignition coil comprising a primary winding and a secondary winding, single magnetic core means magnetically coupling said primary winding and said stator coil, a spark plug connected across said secondary winding, a capacitor, means for charging said capacitor from said stator coil for an initial portion of each of said pulses, and means for cooperatively energizing said primary winding from both said capacitor and said stator coil for a subsequent portion of each pulse to energize said secondary winding thereby energizing said spark plug, said single magnetic core means and said energizing means being adapted to further energize said primary winding in cooperation with the energization of said primary winding by said capacitor and said stator coil to enhance the energization of said secondary winding and said spark plug.
In a capacitor discharge ignition circuit the combination comprising an ignition coil having a primary and a secondary winding coil, a stator core on which said primary and secondary windings are disposed, a magnetic structure including a north magnetic pole and a south magnetic pole for energizing said primary winding through said stator core with a time-varying magnetic flux such that said primary winding generates an output waveform which includes repetitive pulses of one polarity, a spark plug, a main capacitor, a charge coil also disposed on said stator core being energized by said time-varying magnetic flux provided by said north and south magnetic poles for energizing said main capacitor, a solid state switch means connecting said capacitor to said primary winding, said solid state switch means being arranged to conduct current from said capacitor to said primary winding in response to a trigger signal and triggering circuit means coupling said primary coil and said solid state switch means such that said solid state switch means is rendered conductive in response to a trigger signal derived from said pulses generated by said primary winding upon energization thereof by said time-varying magnetic flux provided by said north and south magnetic poles, which trigger signal occurs after said capacitor has been energized.
In a capacitor discharge ignition circuit the combination comprising a stator coil, means for energizing said coil with a time-varying magnetic flux such that said coil generates an output waveform which includes repetitive pulses of one polarity, an ignition coil comprising a primary winding and a secondary winding, a spark plug connected across said secondary winding, a capacitor connected across said stator coil, breakdown means without a trigger connection for breakdown thereof connecting a junction of said capacitor and said stator coil to said primary winding, said breakdown means being arranged to conduct current from said capacitor and said stator coil to said primary winding, said breakdown means conducting by breakdown thereof, said breakdown being caused by the output pulse from said stator coil reaching a selected magnitude sufficient to break down said breakdown means, said capacitor discharging into said primary winding in response to breakdown of said breakdown means to cause said spark plug to fire.
In a capacitor discharge ignition system the combination comprising:
In a capacitor discharge ignition system wherein the system operates to perform a first function of charging a capacitor;
Dependencies are inferred from the claim text.