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AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsTakashi Ito, Katsuaki Fukatsu, Ryoichi Kobayashi, Noboru Sugiura
Estimating the term…
An ignition apparatus for an internal combustion engine has an arrangement comprising a power part and a control part which are accumulated in a one-chip in an IGBT monolithic silicon substrate. The control circuit part has current limiting function of prevent the flowing of any current which is above a predetermined value as well as function of detecting malfunction heat generation by which a primary electric current is blocked compulsorily. The secondary voltage of an ignition coil is generated repeatedly below a plug discharge voltage so as not to generate spark discharge in the sparking plug when the electric current compulsory blocking is carried out, and energy charged in the ignition coil is emitted or discharged. With this arrangement, the one-chip ignition apparatus with high reliability can be achieved.
A one-chip type ignition apparatus for an internal combustion engine, comprising a power switching part configured to carry out current flowing and blocking control for primary current flowing through an ignition coil in response to an ignition control signal outputted from an electronic control device for the internal combustion engine and thereby to generate a high voltage at a secondary side of the ignition coil, and an element protection circuit part integrated on a monolithic silicon substrate of a power transistor together with said power switching part, wherein said ignition apparatus has current limiting function and a function of compulsorily blocking a collector current when an abnormal condition is sensed during flow of collector current, and wherein at a time of the collector current compulsory blocking, energy which has been charged in the ignition coil is caused to be emitted by repetitively generating the secondary voltage of the ignition coil which is under a plug discharge voltage.
A one-chip semiconductor for igniting an internal combustion engine, comprising a power transistor through which primary current of an ignition coil flows in response to an input signal, and means for step-wise decreasing collector current of said power transistor under an abnormal condition.
Dependencies are inferred from the claim text.