Ignition system of internal combustion engine
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsTakashi Ito, Katsuaki Fukatsu, Ryoichi Kobayashi, Noboru Sugiura
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Abstract
An ignition circuit is formed in one chip comprising an insulated gate bipolar transistor for controlling the flow of a primary current, a current limiting circuit for limiting the current flowing into the transistor, and a thermal shut-off circuit capable of forcibly shutting off the primary current in case of trouble. In the ignition circuit, a power supply GND terminal and an ignition control signal positive terminal are divided.
Claims8
An ignition system of an internal combustion engine provided with a primary coil and an ignition circuit which controls the flow of a primary current according to an ignition control signal to produce a high voltage on the secondary side, said ignition circuit comprising one integrated chip having an insulated gate bipolar transistor for controlling the flow of the primary current, a current limiting circuit for limiting the current flowing to said transistor, and a thermal shut-off circuit for forcibly opening the primary current circuit in case of a malfunction.
An ignition system of an internal combustion engine provided with a primary coil and an ignition circuit which controls the flow of a primary current according to an ignition control signal to produce a high voltage on the secondary side, said ignition circuit comprising a thermal shut-off circuit for forcibly opening the primary current circuit in case of a malfunction, and a latching circuit for latching the output of said thermal shut-off circuit;
- said latching circuit being set when said ignition control signal is turned on and an overtemperature detecting signal has been detected, and is reset when said ignition control signal is turned off.
An ignition system of an internal combustion engine provided with a primary coil and an ignition circuit coupled thereto, wherein said ignition circuit comprises a single chip integrally including an insulated gate bipolar transistor having an output which couples with the primary coil;
- a current limiting circuit coupled to said insulated gate bipolar transistor;
- and
- a thermal shut-off circuit coupled to the insulated gate bipolar transistor.
Dependencies are inferred from the claim text.