The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 1989
Filed:
Mar. 29, 1988
Akira Ohata, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
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.