Resources Contact Us Home
Shift control of automatic transmission

Image Number 11 for United States Patent #8386139.

A subtransmission mechanism 30 comprises a Ravigneaux planetary gear mechanism 31, a Low brake 32 and a High clutch 33, shifts between a first speed gear position in which the Low brake 32 is engaged whereas the High clutch 33 is disengaged and a second speed gear position in which the Low brake 32 is disengaged and the High clutch 33 is engaged. A minute slip is caused at the Low brake 32 and then terminated by engaging the High clutch 33. A value representing the engaging state variation such as an engaging time period and/or an engaging speed of the High clutch 33 is learned and the pressure of oil supplied during the engaging operation of the High clutch 33 is corrected based upon the learned value, thereby assuring a smooth shift operation by compensating for any inconsistency in the torque transmission characteristics of the High clutch 33.

  Recently Added Patents
Liquid crystal display backlight control
System and method for improving cache efficiency
Controller for machine tool and five-axis simultaneous control machine tool controlled thereby
Dual functional medium shredding machine structure
Polyolefin and composition for pipe systems and sheets
Systems and methods for advertising on content-screened web pages
Method for repairing or replacing damaged tissue
  Randomly Featured Patents
Grille for a smoke detector
Movable machining chamber with rotatable work piece fixture
Starter generator system with two stator exciter windings
Method and apparatus for manufacture and inspection of swatch bearing sheets using a vacuum conveyor
Alkoxyalkylation of phenol
Application hierarchy and state manipulation
Installing software in a system
Curtain-hanging means for recreational vehicles
Polymeric active methylene compounds, their preparation and their use in azo polymers