Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1980-11-21
1982-08-31
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
123490, H01H 4732
Patent
active
043475442
ABSTRACT:
An injector drive circuit for driving an injector having a valve opened and closed according to a pulse signal with the pulse duration thereof corresponding to the quantity of fuel supplied to the engine. The injector drive circuit comprises a current supply power transistor connected to an injector coil. According to an electric pulse signal from a fuel injection control circuit, a first current control section causes base current to flow into the power transistor for causing a peak current through the injector coil. When a predetermined peak current is detected, the base current supplied by the first current control section is cut off. From this instant till the disappearence of the electric pulse signal, a second current control section, which supplies base current to the power transistor only when the current supplied from the power transistor to the injector coil becomes lower than a working current level, supplies in effect the working current through the power transistor to the injector.
REFERENCES:
patent: 4092717 (1978-05-01), Di Nunzio
patent: 4134367 (1979-01-01), Ferry et al.
patent: 4173030 (1979-10-01), Rabe
patent: 4180026 (1979-07-01), Schulzke et al.
patent: 4225898 (1980-09-01), Weber et al.
patent: 4234903 (1980-11-01), Harper
Eisenzopf Reinhard J.
Nippondenso Co. Ltd.
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