Vehicle engine ignition timing system with adaptive knock retard

Details Vehicle engine ignition timing system with adaptive knock retard Vehicle engine ignition timing system with adaptive knock retard

1990-10-23

1992-02-25

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

F02P 514

Patent

active

050903829

ABSTRACT:
An ignition timing system generates ignition timing pulses from a basic ignition timing, a current knock retard and an adaptive knock retard. It includes a plurality of memory cells in a one-dimensional lookup table referenced to predetermined engine speeds and determines the adpative knock retard by multiplying a number derived from the cells at the current engine speed by a load gain factor based on current engine load. It updates the cells on a fixed time period basis. When sufficient knock has occurred in a time period, an increase is applied to the one or more cells closest to the engine speed at which knock first occurred during the period, with the amount of increase based on the maximum current knock retard during the period. Thus, updating is frequent and may occur even in transient conditions; and the correction is focused on the engine speed at which knock was initiated so as to prevent such knock initiation in the future.

REFERENCES:
patent: 4274379 (1981-06-01), Iwata et al.
patent: 4328779 (1982-05-01), Hattori et al.
patent: 4452206 (1984-06-01), Haraguchi et al.
patent: 4811714 (1989-03-01), Akasu
patent: 4819603 (1989-04-01), Morita et al.
patent: 4867124 (1989-09-01), Javabarian
patent: 4899711 (1990-02-01), Tabara et al.
patent: 4969439 (1990-11-01), Scotson
patent: 4981124 (1991-01-01), Sallner et al.

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