Preignition detecting method

Details Preignition detecting method Preignition detecting method

1997-05-28

1998-05-12

Nguyen, Vinh P.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324391, 324393, 123425, F02P 1700

Patent

active

057511470

ABSTRACT:
A preignition detecting method which prevents preignition (PI) from being misjudged as having occurred when an ignition plug is fouling. It is determined whether or not the ignition plug fouls in accordance with a voltage, developed across a detecting resistor which is fetched into a microcomputer 18 at a relatively early timing after an ignition command signal is outputted from an ignition device. Further it is determined whether or not preignition occurs in accordance with another voltage fetched at a relatively late timing after the ignition command signal is outputted. When it is determined that the ignition plug is fouling, it is inhibited to fetch the another voltage at a relatively late timing to prevent a misjudgment that preignition occurs due to a leakage current from being caused though preignition does not actually occur.

REFERENCES:
patent: 4233943 (1980-11-01), Rogora et al.
patent: 4846129 (1989-07-01), Noble
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patent: 5204630 (1993-04-01), Seitz et al.
patent: 5521509 (1996-05-01), Ishikawa et al.
patent: 5632247 (1997-05-01), Hashizume et al.

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