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:
Feb. 01, 1994
Filed:
Feb. 07, 1992
Kumaraswamy V Hebbale, Troy, MI (US);
Chi-Kuan Kao, Troy, MI (US);
Dean E McCulloch, Washington, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An upshift control in which open-loop control parameters are adaptively adjusted to improve the shift quality in a subsequent upshift to the same ratio. A multi-variable adaptive control methodology attributes detected torque phase timing deviations to variability in the on-coming fill time and/or return spring pressure, and suitably corrects the parameter(s) so that in the next shift of the same type, the detected deviation will be reduced or eliminated. The torque phase timing deviations are detected by measuring specified intervals in relation to the achievement of predetermined input and output acceleration conditions, and comparing the measured intervals with reference intervals. The gradients of the deviations in relation to the respective control parameter are determined and stored in a look-up table, and subsequently used to determine adaptive correction values.