Electronic ignition-coil control device for an internal combustion engine
AssigneeGroupement d'Interet Economique de Recherches et de Developpement PSA
InventorAndre Xiberas
Life of this patent
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Abstract
The primary winding of an ignition coil is placed in series with the collor of a switching transistor. In order to protect the transistor against overvoltages, the collector is also connected to a level comparator and the base receives a two-state control signal which is synchronous with the rotation of the engine. One input of the comparator is connected through a divider network to the collector of the transistor and the outer input is connected to a fixed direct-current voltage source. Provision is also made for an error amplifier connected to the output of the comparator, and for a summing circuit which is connected to the control input of the transistor and receives the control signal.
Claims5
An ignition-coil device for an internal combustion engine having an ignition-coil with a primary and a secondary winding, a switching transistor in which a collector thereof is connected to the primary winding of the ignition-coil and a base of the transistor receives a two state control signal from an electronic transducer which signal is synchronous with the rotation of the engine to either turn-off or turn-on said transistor, said control device comprises in series-connected relation:
- a level comparator having a first input connected through a divider network to the collector of said switching transistor and having a second input connected to a fixed direct-current voltage source and providing an output in response to the voltage at the collector of said switching transistor;
- an error amplifier connected to the output of said level comparator;
- a summing circuit which receives the output of said error amplifier and said two-state control signal in order to protect said transistor from overvoltage occuring during operation by regulating the current which flows through the primary winding of said ignition coil.
Dependencies are inferred from the claim text.