Method and arrangement for adjusting air/fuel ratio of an i. c.

Details Method and arrangement for adjusting air/fuel ratio of an i. c. Method and arrangement for adjusting air/fuel ratio of an i. c.

1992-09-10

1993-07-13

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123438, F02D 4104, F02D 4126

Patent

active

052269205

ABSTRACT:
For adjusting the air/fuel ratio (A/F) of an i. c. engine having an electrically adjustable carburetor, an electronic detector and control unit is used to which current is supplied by an ignition magnet or generator and which comprises a tachometer, data processing means, an electronic memory, and a control unit for adjusting said ratio. The first derivative of the speed of revolution of the engine is used as a parameter for the adjustment. According to the invention, the adjustment is made after a period of time during which the speed of the engine has been generally constant. Generally constant speed is detected by calculating the average value of said derivative, such that the speed of revolution of the engine is considered to be generally constant when said average value is approximately zero.

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