Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1986-06-30
1988-08-16
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123480, F02B 300
Patent
active
047636270
ABSTRACT:
A learning and control apparatus for an electronically controlled internal combustion engine having such an object to be controlled as a fuel injection valve for controlling the air-fuel ratio in an air-fuel mixture or an idle speed control valve for controlling the idle rotation number of the engine wherein a pulse duty signal corresponding to a basic control value is set according to engine driving states. The basic control value is corrected by adding an appropriate correction value to the basic control value. Feedback control is carried out so that the actual controlled value is made to follow the aimed control value, and a learning correction quantity is computed by learning said feedback control so that the feedback control amount is set as small as possible. Driving region judging means judges the driving region stored learning correction quantity in a memory map corresponding to the detected actual driving state with such a hysteresis that at least one of the driving region-defining lattice axes in the memory map is shifted by a predetermined value according to the direction of change of the parameter of the engine driving state, thereby when the engine is driven in the driving state near the boundary that is lattice axes, between adjacent driving regions having a large difference between respective learning correction quantities no hunting phenomenon of the control quantity in engine driving and stable control characteristics can be maintained.
REFERENCES:
patent: 4646697 (1987-03-01), Grob
patent: 4669439 (1987-06-01), Mamiya
Cox Ronald B.
Japan Electronic Control Systems Co. Ltd.
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