Wire disconnection diagnosis apparatus of fuel injector drive ci

Details Wire disconnection diagnosis apparatus of fuel injector drive ci Wire disconnection diagnosis apparatus of fuel injector drive ci

1991-10-15

1993-04-20

Myracle, Jerry W.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

324546, G01M 1900

Patent

active

052038688

ABSTRACT:
The present invention relates to an apparatus for diagnosing the presence or absence of a wire disconnection in a fuel injector drive circuit.
When driving the solenoid of a fuel injector via a transistor by a drive pulse signal, the counter electromotive voltage used to turn off the transistor during a fall of a drive pulse signal is taken out and is charged to a capacitor included in the charge/discharge circuit. Also, the terminal voltage of the capacitor is determined during the rise of the drive pulse signal, and a wire disconnection is detected when the voltage is lower than a predetermined value. Further, a discharge of capacitor is started immediately after this determination, and a discharge of the capacitor is ended upon the fall of the drive pulse signal.

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