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US 4,046,125 AGranted
Capacitive discharge ignition system
OwnerRonald D. Mackieinventor
Life of this patent
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Abstract
A high efficiency capacitive discharge ignition system utilizing the principle of simultaneous energy storage on both a capacitor and an inductor during the time that energy is drawn from the vehicle battery. The system is adapted for use with a breakerless type distributor by providing transistor switching circuitry which opens and closes a circuit on the primary side of a transformer in accordance with the output pulse of the distributor.
Claims14
A breakerless capacitive discharge ignition system, comprising,
- a breakerless distributor including a rotating member and a pickup coil which has voltage pulses induced therein as said member rotates, each of said induced voltage pulses having a positive and negative excursion,
- a step-up transformer having a primary winding and a secondary winding,
- a primary circuit comprising said primary winding, a battery and a switch means,
- a discharge capacitor,
- a silicon controlled rectifier and an ignition coil being connected in circuit relationship with each other, with said discharge capacitor, and with the secondary winding of said transformer,
- means for applying the voltage induced across said secondary winding of said transformer when said primary circuit closes to said discharge capacitor to charge it,
- means for discharging said discharge capacitor through said silicon controlled rectifier and said ignition coil when said primary circuit opens to provide an ignition spark,
- storage capacitor means for aiding said transformer in charging said discharge capacitor,
- means for charging said storage capacitor when said primary circuit opens,
- said switch means comprising means controlled by said induced voltage pulses for closing and opening said primary circuit for causing current to flow and stop flowing in said primary circuit, and including a first transistor switch means for closing said primary circuit during said positive excursions of said pulses for allowing current from said battery to flow through said primary winding of said transformer, the trigger path of said transistor switch consisting of at least a diode directly connected to said transistor in the base-emitter circuit thereof, said at least a diode having a short circuit voltage of a first predetermined amplitude level and means for closing said transistor switch means when said positive part of said pulse rises above said first amplitude level and for opening said transistor switch means when said positive part of said pulse falls below said first amplitude level, said at least a diode being effective to block the negative part of said pulses from said transistor switch means.
7 more elements
A capacitive discharge ignition system comprising,
- a step-up transformer having a primary winding and a secondary winding,
- a primary circuit comprising said primary winding, a battery and a switch means, said switch means comprising means for closing and opening said primary circuit for causing current to flow and stop flowing in said primary winding,
- a discharge capacitor,
- a silicon controlled rectifier and an ignition coil being connected in circuit relationship with each other, with said discharge capacitor, and with the secondary winding of said transformer,
- means for applying the voltage induced across said secondary winding of said transformer when said primary circuit closes to said discharge capacitor to charge it,
- storage capacitor means for aiding said transformer in charging said discharge capacitor,
- means for charging said storage capacitor when said primary circuit opens,
- means for triggering said silicon controlled rectifier, when said primary circuit opens,
- means for discharging said discharge capacitor through said silicon controlled rectifier and said ignition coil when said silicon controlled rectifier is triggered to provide an ignition spark,
- said means for triggering including a trigger capacitor and a diode, said diode being connected between the cathode of said silicon controlled rectifier and one side of said trigger capacitor, the other side of said trigger capacitor being connected to one side of said secondary winding of said transformer.
7 more elements
Dependencies are inferred from the claim text.