Rotational position detector device for an internal combustion e

Details Rotational position detector device for an internal combustion e Rotational position detector device for an internal combustion e

1989-10-06

1990-08-28

Nelli, Raymond A.

Internal-combustion engines

High tension ignition system

Having engine component position sensor

F02P 504

Patent

active

049516396

ABSTRACT:
A rotational position detector for detecting the position of the crankshaft of a multi-cylinder internal combustion engine is disclosed. A signal generator generates pulses whose leading and trailing edges correspond to the first and second rotational positions of the crankshaft with respect to the respective cylinders. The first and the second rotational positions are at 75 degrees BTDC and 5 degrees BTDC with respect to respective cylinders; however, the second rotational position of the crankshaft with respect to a particular cylinder (cylinder No. 1) is displaced to the retarding side by 10 degrees, i.e. to 5 degrees ATDC. Thus, those pulses which correspond to cylinder No. 1 is identified as follows: first, the duty ratio t/T of the pulse width t to the period T between the leading edges of the two successive pulses is calculated; then, the duty ratio t/T is compared with a predetermined reference level to identify the pulses corresponding to cylinder No. 1.

REFERENCES:
patent: Re31709 (1984-10-01), Ford
patent: 3407796 (1968-10-01), Hetzler
patent: 3421488 (1969-01-01), Tarter
patent: 3976044 (1976-08-01), Madeira et al.
patent: 4700305 (1987-10-01), Lotterbach et al.
patent: 4747389 (1988-05-01), Yuzawa et al.

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