Method of detecting abnormality in crank angle signal of interna

Details Method of detecting abnormality in crank angle signal of interna Method of detecting abnormality in crank angle signal of interna

1986-05-23

1988-12-06

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

73116, 36443111, F02P 515, F02P 1100

Patent

active

047889560

ABSTRACT:
A method of detecting an abnormality in a crank angle signal of an internal combustion engine having a crankshaft. The method comprises the steps of monitoring the condition of a first reference position signal generated at a predetermined crank angle position of the crankshaft and the condition of a second position signal generated whenever the crankshaft rotates through a predetermined rotational angle, setting a first flag to a predetermined logical state if the first reference position signal is generated before the second position signal is generated a predetermined number of times after generation of the first reference position signal, setting a second flag to a predetermined logical state if the first reference position signal is not generated after the second position signal has been generated said predetermined number of times after generation of the first reference position signal and before an immediately succeeding generation of the second position signal; and detecting an abnormality in one of the first reference position signal and second position signal based on a predetermined combination of logical states exhibited by the first and second flags.

REFERENCES:
patent: 4395905 (1983-08-01), Fujimori et al.
patent: 4485784 (1984-12-01), Fujii et al.
patent: 4628882 (1986-12-01), Sakurai et al.
patent: 4664082 (1987-05-01), Suzuki

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