Onboard diagnostic system of vehicle ignition system

Details Onboard diagnostic system of vehicle ignition system Onboard diagnostic system of vehicle ignition system

1988-10-03

1990-02-13

Raevis, Robert R.

Measuring and testing

Simulating operating condition

Marine

G01M 1900

Patent

active

048995797

ABSTRACT:
A method of operating an onboard diagnostic system for a distributorless ignition system of an internal combustion engine includes detecting the time of occurrence of a spark plug firing and calculating the time of spark plug firing. The calculated time and the detected time are compared to see if they come within a predetermined time period, adjusted for averaged rotational velocity. A fault is indicated if the time of occurrence of the calculated and the detected spark do not come within the predetermined time period.

REFERENCES:
patent: 3857086 (1974-12-01), Mooney et al.
patent: 4644284 (1987-02-01), Friedline et al.
patent: 4711227 (1987-12-01), Li et al.
patent: 4760341 (1988-07-01), Skerritt
"Ignition and Timing Systems", by K. L. Longstaff, Institution of Electrical Engineers Publication No. 181 (1979), entitled Automotive Electronics.
"A Distributorless Ignition System--Solid State Ignition High Voltage Distribution with Low RFI Emissions", by J. R. Asik, D. F. Moyer, and W. G. Rado, 1978, SAE Technical Paper 780327.

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