Individual cylinder ignition control

Details Individual cylinder ignition control Individual cylinder ignition control

1985-09-25

1987-01-27

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123417, 123425, F02P 500, F02P 514

Patent

active

046387803

ABSTRACT:
An ignition system for providing individual cylinder spark control includes a shaft encoder driven by the engine crankshaft which provides a primary timing pulse at the top dead center point of cylinder No. 1 as well as a large number of encoder pulses per engine revolution. With the primary timing pulse as a reference, the encoder pulses are supplied to a modulo N counter which provides output pulses at the theoretical top dead center point of each cylinder, to a cylinder address counter and to a fixed delay counter, which provides an output a fixed number of encoder pulses from the previous output pulse from the modulo N counter to set a maximum ignition advance point. A memory device has a channel programmed with information as to the variation, in terms of encoder pulses (crank angle) of each cylinder actual top dead center from the theoretical angle as defined by the modulo N counter output. The memory receives cylinder address information and the output from the fixed delay counter to cause it to unload binary information defining the delay from the maximum advance point to the variable delay counter. The variable delay counter output then sets the ignition timing for each individual cylinder.

REFERENCES:
patent: 4378004 (1983-03-01), Petrie
patent: 4413599 (1983-11-01), Shigematsu et al.
patent: 4414946 (1983-11-01), Daumer et al.

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