IGNITION FAILURE SENSOR OF IGNITION PLUG

PURPOSE:To sense any failure of ignition at a high level of precision by detecting secondary voltage of a current discharged for a certain period after the discharging is started, comparing the voltage with a reference voltage and providing a detecting means which detects a failure of ignition on ac...

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Bibliographic Details
Main Authors SATO HIROSHI, FUJIKI NORIO, KAWAI AKIO
Format Patent
LanguageEnglish
Published 15.07.1986
Subjects
BLASTING
COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES
LIGHTING
MECHANICAL ENGINEERING
TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
WEAPONS
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Summary:PURPOSE:To sense any failure of ignition at a high level of precision by detecting secondary voltage of a current discharged for a certain period after the discharging is started, comparing the voltage with a reference voltage and providing a detecting means which detects a failure of ignition on account of contaminatation thereof due to carbon etc. CONSTITUTION:A high voltage V2 which is applied to an ignition plug 1 is regenerated as a positive output v'2 via an attenuator 3 and an inverter buffer 4. On the other hand, a signal SIG which drives an ignition coil electrifying power switch triggers a mono-stable multivibrator 8 via an inverter 6 and a delay circuit 7 of 50mus, generates a pulse signal SC of a specified time width. An analog switch 5 is kept on for the time width and generates an input signal v'2 as a signal SS. A comparing circuit 10 compares the signal SS with a refer ence signal SR fed from a reference signal generating circuit 9. In case of SS>SR, a signal S0 is generated so that failure of ignition caused by contamina tion of an ignition plug or other reasons can be detected without any possibility of misdetection.
Bibliography:Application Number: JP19840274778