Automotive engine control system with rotary encoder indexing

Details Automotive engine control system with rotary encoder indexing Automotive engine control system with rotary encoder indexing

1992-05-11

1993-05-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 123613, G01D 534

Patent

active

052123804

ABSTRACT:
An automotive engine control system is provided for an automobile having a variable rotation speed engine which has a plurality of spark plugs served by respective spark plugs. The system includes an optical rotary encoder having a rotatable pulse scale having a row of code pattern with specific light-permeable or light-deflection slits each for outputting a reference position signal and other light-permeable or light-reflection slits each adapted to reduce the amount of light for outputting an angular signal, both of the optical signals being photoelectronically converted and the waveform of the resultant electric signals being shaped based on threshold voltages into electric pulse signals indicative of a reference angle of 0.degree. and the accumulated angle of rotation, in which the circumferential width of each specific reference slit is made narrower than that of other slit so that the pulse width for angular position-indicating of the angular pulse signal is always equal and constant for ensuring more accurate detection of the angle of rotation. As the engine rotation speed is sensed to speed up and slow down, by a sensor that is operatively connected with the engine, the optical rotary encoder varies igniting of the spark plugs.

REFERENCES:
patent: 4145608 (1979-03-01), Shirasaki et al.

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