Non-linear feedback controller for internal combustion engine

Details Non-linear feedback controller for internal combustion engine Non-linear feedback controller for internal combustion engine

1988-03-29

1989-08-29

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123341, 123352, F02D 4116

Patent

active

048607070

ABSTRACT:
A single physical model which receives inputs of at least the intake pressure and rotational speed of an internal combustion engine and which produces an output which controls an opening area of an intake passage is developed for a controller to control the idling speed or the output of the internal combustion engine on the basis of modern control theory. When the intake pressure is equal to or less than a predetermined value (critical pressure), the flow velocity of air which is sucked into a cylinder is fixed at sonic velocity, irrespective of changes in the level of the intake pressure, so the quantity of intake air is proportional to the opening area of the intake passage. Under these conditions, a manipulating quantity for controlling the opening area is determined by multiplying a control quantity outputted from the controller by a predetermined constant. On the other hand, when the intake pressure exceeds the critical pressure, the quantity of air flowing into the cylinder changes in accordance with the difference between the intake pressure and the atmospheric pressure. In that case a manipulating quantity is determined by compensating the control quantity in accordance with the pressure difference.

REFERENCES:
patent: 4305360 (1981-12-01), Meyer et al.
patent: 4492195 (1985-01-01), Takahashi et al.
patent: 4653449 (1987-03-01), Kamei et al.
patent: 4658783 (1987-04-01), Janetzke et al.
patent: 4667632 (1987-05-01), Shimomura et al.
patent: 4709674 (1987-12-01), Bianchi et al.

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