Electricity: measuring and testing – Internal-combustion engine ignition system or device – Electronic ignition system
Patent
1984-10-18
1987-01-27
Krawczewicz, Stanley T.
Electricity: measuring and testing
Internal-combustion engine ignition system or device
Electronic ignition system
F02P 1700
Patent
active
046396764
ABSTRACT:
The diagnostic device comprises voltage divider resistors, two comparators, a start switch, a microcomputer, two transistors, and two light emitting diodes. The ignition signal is voltage-divided by the voltage divider resistors, and the result of this voltage division is input into the positive terminals of the comparators. Reference voltages are input to the negative terminals of the comparators which determine how high the inputs to the positive terminals must be for each comparator to have an "H" level output. When the start switch is turned ON the device starts to operate. In the microcomputer, which has a timer function built in, the interrupt terminal (INT) becomes connected to the output terminal of the comparator; the reset terminal (RES) becomes connected to the start switch. In addition, when the result of the diagnosis is normal, the output terminal OUT 1 of the microcomputer connected to the base of the transistor outputs a signal, while when the result of the diagnosis is abnormal, the output terminal OUT 2 connected to the base of the transistor outputs a signal. A light emitting diode of one color, for example green, is connected to the collector of the transistor, and lights up when the result of the diagnosis is normal, while a light emitting diode of another color, for example red, is connected to the collector of the other transistor, and lights up when the result of the diagnosis is abnormal.
REFERENCES:
patent: 4101822 (1978-07-01), Doss et al.
patent: 4449100 (1984-05-01), Johnson et al.
Ito Ken
Iwamoto Hideo
Kawai Akio
Krawczewicz Stanley T.
Nissan Motor Co,. Ltd.
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