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Patent Searching and Data


Title:
DIGITAL CONTROLLER
Document Type and Number:
WIPO Patent Application WO/1991/010057
Kind Code:
A1
Abstract:
A device for controlling the engine speed in idling of an internal combustion engine to which so-called ''modern control theory'' is applied, and is directed to improve drastically the converging speed to a target number of revolution. The present invention updates the values of state variables even in an open-loop control state, to calculate initial values at the time of shift to feedback control. When a change of state of an external load is detected, an integration value is corrected in a feed-forward manner before it is limited to a predetermined range integration value limiting means in accordance with such a change of state. The present invention divides dynamic model for a control system into a dead time portion and a portion after the dead time portion, and identifies the dynamic model by a discrete system for each of these portions to configurate it.

Inventors:
KAWAI KATSUHIKO (JP)
KATO TATSUNORI (JP)
NAKABAYASHI KATSUHIKO (JP)
IIDA HISASHI (JP)
ISOMURA SHIGENORI (JP)
KONDO TOSHIO (JP)
Application Number:
PCT/JP1990/001684
Publication Date:
July 11, 1991
Filing Date:
December 25, 1990
Export Citation:
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Assignee:
NIPPON DENSO CO (JP)
International Classes:
F02D31/00; F02D41/08; F02D41/14; F02D41/16; (IPC1-7): F02D41/14; F02D41/16; F02D45/00
Foreign References:
JPS6328225A1988-02-05
JPS6340929A1988-02-22
JPS648336A1989-01-12
JPS6375334A1988-04-05
US4860707A1989-08-29
Other References:
See also references of EP 0474871A1
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