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:
Apr. 25, 2000
Filed:
Dec. 24, 1997
Eiji Moriyama, Okazaki, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
In a transmission control apparatus and a transmission control method for an automatic transmission, when a detection point is defined in accordance with results of detection by means of a fluid temperature detecting element and a rotational speed detecting element, a plurality of points that surround the detection point are selected among a plurality of preset points. Control values for a control parameter are previously mapped corresponding to the set points, and the control values corresponding to the selected points are read from the resulting map. The controlled variable of the control parameter corresponding to the detection point is appropriately linearly calculated by interpolating the control values. Further, a learning correction value for the control parameter corresponding to the detection point is calculated, and is reflected in the control values for the selected points. Accordingly, even in a situation such that an engine speed and a line pressure are low, as in the case of a shift from the N-range to the D- or R-range, coast-downshift, power-off upshift, etc., the controlled variable of the control parameter can always be adjusted to an appropriate value without regard to dispersion of the hydraulic characteristics attributable to variation in workmanship between individual automatic transmissions or the level of the fluid temperature. Thus, lowering of shift response and shift shock during transmission control can be prevented securely.