Method and apparatus for detecting abnormal state in pulse train

Details Method and apparatus for detecting abnormal state in pulse train Method and apparatus for detecting abnormal state in pulse train

1988-04-14

1989-06-06

Levy, Stewart J.

Measuring and testing

Simulating operating condition

Marine

377 20, G01M 1900

Patent

active

048360163

ABSTRACT:
In an internal combustion engine having a sensor which generates a pulse signal, a time period is measured during which the engine rotational speed is larger than a reference speed, and the time period is reset at every rise or fall of the pulse signal. As a result, when the measured time period is larger than a predetermined time period, an abnormal state signal is generated, thereby detecting an abnormal state of the sensor.

REFERENCES:
patent: 4060979 (1977-12-01), Elsaesser et al.
patent: 4402217 (1983-09-01), Higashiyama
patent: 4517831 (1985-05-01), Hirano
patent: 4537065 (1985-08-01), Ootsuka et al.
patent: 4635214 (1987-01-01), Kasai et al.

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