System for controlling ignition timing of an internal combustion

Details System for controlling ignition timing of an internal combustion System for controlling ignition timing of an internal combustion

1990-06-29

1991-05-21

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

F02P 514

Patent

active

050165909

ABSTRACT:
A plurality of basic ignition timings are stored in a first memory in accordance with engine speed and absolute pressure of intake air. An ignition timing is calculated based on the basic ignition timing derived from the first memory. A plurality of retard quantities are stored in a second memory in accordance with the atmospheric pressure. One of retard quantities is derived from the second memory in accordance with a detected atmospheric pressure. The basic ignition timing is retarded with the derived retard quantity, thereby correcting the ignition timing.

REFERENCES:
patent: 4271797 (1981-06-01), McCarbery
patent: 4590563 (1986-05-01), Matsumura et al.
patent: 4600993 (1986-07-01), Pauwels et al.
patent: 4814997 (1989-03-01), Matsumura et al.

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