Ignition device for internal combustion engine
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMitsuru Koiwa, Kouichi Okamura
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Abstract
An ignition device for an internal combustion engine includes a transistor circuit used to turn a primary current of an ignition coil on and off to produce a high voltage for spark ignition. A reference voltage generator produces a temperature compensated reference voltage. A primary current detecting circuit produces a voltage corresponding to a primary current of the ignition coil. A comparator compares the temperature compensated reference voltage with the voltage produced by the primary current detecting circuit. A control circuit responsive to an output of the comparator controls a base voltage of the transistor circuit to a predetermined constant value.
Claims3
An ignition device for an internal combustion engine having transistor means for controlling a primary current of an ignition coil to produce a high voltage for spark ignition, comprising:
- a reference voltage generator for producing a temperature compensated reference voltage which is independent of a source voltage;
- a primary current detecting circuit for producing a voltage corresponding to said primary current of the ignition coil;
- a comparator for comparing said temperature compensated reference voltage with said voltage produced by said primary current detecting circuit;
- and
- a control circuit responsive to an output of said comparator to control a base voltage of said transistor means to a predetermined constant value.
Dependencies are inferred from the claim text.