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| Number | Title | Issue Date |
| 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... | 05/20/2008 |
| 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... | 04/25/2006 |
| 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 | 07/20/1999 |
| 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... | 09/01/1998 |
| 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... | 12/03/1996 |
| 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... | 08/23/1994 |
| 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... | 07/03/1990 |
| 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... | 06/23/1987 |
| 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... | 09/10/1985 |
| 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 | 10/16/1984 |
| 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... | 04/13/1982 |
| 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... | 02/19/1980 |
