Ignition system for internal combustion engine
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsTakashi Ito, Ryoichi Kobayashi, Katsuaki Fukatsu
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Abstract
A current on the primary side of an ignition coil is subjected to repeated conduction/cutoff control in accordance with an ignition control signal of an ECU to thereby generate a high voltage for ignition twice or more in one combustion stroke. In such a multiple ignition system for an internal combustion engine, the primary current of the ignition coil is detected by a resistor to thereby make the ECU recognize the fact that the primary current has reached a value not smaller than a set value through a signal line when the primary current becomes not smaller than the set value. The ECU determines cutoff timing in the second-time et seq. in the repeated conduction/cutoff control on the basis of the recognition.
Claims5
An ignition system for an internal combustion engine, comprising an engine control unit for generating an ignition control signal for said internal combustion engine, and an ignition circuit for performing conduction/cutoff of a primary current on a primary side of an ignition coil in accordance with said ignition control signal to thereby generate a high voltage on a secondary side of said ignition coil, whereby conduction/cutoff of the primary current is controlled so as to be performed repeatedly in accordance with said ignition control signal so that the high voltage for ignition is generated twice or more in one combustion stroke of said internal combustion engine, wherein:
- said ignition system further comprises communication means for detecting said primary current of said ignition coil and making said engine control unit recognize a fact that the primary current reaches a value not smaller than a set value when said communication means detects the fact;
- and
- said engine control unit is set so that cutoff timing in a second-time et seq. of the repeated conduction/cutoff control of the primary current in one combustion stroke is determined in accordance with the recognition of said fact.
Dependencies are inferred from the claim text.