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US Patent 7292922 Target volume based torque phase control during upshift

Patent 7292922 was granted and assigned to Chrysler on November, 2007 by the United States Patent and Trademark Office.

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Patent
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Current Assignee
Chrysler
Chrysler
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7292922
Patent Inventor Names
Aaron Pfadt0
Gang Chen0
Date of Patent
November 6, 2007
Patent Application Number
11222066
Date Filed
September 8, 2005
Patent Primary Examiner
‌
Gertrude A. Jeanglaude
Patent abstract

A transmission control system includes a first gear engagement element that receives fluid and engages a first gear. An electromagnetic actuator selectively interrupts fluid flow to the first gear engagement element based on a duty cycle of a control signal. A control module adjusts the duty cycle so that a fluid flow rate continuously decreases as the first gear engagement element produces a first torque sufficient to hold the first gear. The flow rate is based on a first estimated volume of the fluid necessary for the first gear engagement element to produce the first torque. The control module computes a current volume of the fluid when the first gear engagement element produces the first torque. The control module adjusts a value of the first estimated volume for subsequent transmission control when a difference between the current volume and the first estimated volume is greater than a predetermined volume.

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