|7374513||Method and apparatus for adaptive control of closed throttle downshifts in an automatic transmission|
The present invention provides a method and apparatus for adaptively controlling a closed throttle downshift in an automatic transmission wherein a transmission aberration during a shift is diagnosed and corrected during subsequent closed throttle downshifts. The in...
|7033297||Shift control apparatus for automatic transmission|
A shift control apparatus for controlling shifting actions of an automatic transmission including a hydraulically operated frictional coupling device having a hydraulic cylinder which is supplied with a working fluid when the frictional coupling device is engaged, t...
|5924958||Control system for automatic transmission with servo fill of second shift engagement element during completion of first shift when second shift commanded during first shift|
If a shift to the 3rd speed is decided during the 5th-4th speed shift, in which the hydraulic servo for a second clutch is released by pressure regulation control, a changeover valve is switched by a solenoid valve so that the fluid pressure PC2
|5800309||Hydraulic control device for automatic transmission|
A hydraulic control device determines whether the transmission is being shifted down, and upon determination of the shift-down action, determines whether the vehicle is in a power-on condition or in a power-off condition. Upon determination of the power-o...
|5580333||Automatic transmission control system for automobiles|
An automatic transmission control system for selectively locking and unlocking a plurality of frictional coupling elements is provided within an automatic transmission so as to place the automatic transmission into one of various possible gears. The contr...
|5339709||Control system for a combined shift in which an accumulator is disconnected in an automatic transmission|
A control system is provided for an automatic transmission which has primary and second shifting units connected together to provide multi-stage speed ranges. Upon performing a combined shift, a hydraulic control circuit disconnects a hydraulic servomotor...
|4938103||Friction element engagement pressure and timing control arrangement for automatic transmission|
An accumulator which is pressurized during the engagement of the band brake, is arranged with a one-way valve so that the discharge therefrom, which accompanies the downshifting of an associated shift valve, temporarily maintains a pressure which is suppl...
|4674364||Shift control system of automatic transmission|
In a shift control system of an automatic transmission, wherein the shift control system includes at least a first and a second transmissions capable of automatically switching speeds separately of one another, and the first and the second transmissions a...
|4539870||Hydraulic control system for automatic transmission|
A single accumulator is operatively connected to a fluid operated clutch so as to retard a rise in fluid pressure supplied to the fluid operated clutch which is to be engaged during a downshift from the highest speed ratio to any one of the lower speed ra...
|4476747||Timing control valve in automatic transmission control apparatus|
A timing control valve for use in the automatic transmission control apparatus for vehicles has a spring-backed spool which is actuated for movement to one position by the spring force or the spring force and the oil pressure to be applied to the brake B
|4324156||Method and apparatus for hydraulic control of automatic transmission|
A transmission includes a plurality of friction units to effect shifting between gear ratios, one of which includes driving and driven elements which may operate with a speed differential at the time of shifting between gear ratios. A first or line pressu...
|4188839||Throttling control valve and a system for controlling downshift timing of an automatic transmission for vehicles|
A throttling control valve having a spool-like valve element which is gradually shifted in accordance with increase of a control fluid pressure so as to provide four different passage connections therethrough so as to be able to provide four different flo...