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Class 475/128 - Valving controls shift timing


Subclass of Class 475 - Planetary gear transmission systems or components
Definition: Subject matter wherein means is provided to regulate the
No. of patents: 133
Last issue date: 11/08/2011


1        
NumberTitleIssue Date
8052563Electro-hydraulic control system for transmission with dual-area piston for torque-transmitting mechanism
An electro-hydraulic control system is provided for a transmission with a torque-transmitting mechanism that has a dual area piston. When pressurized fluid is provided to a first of the two piston areas, the position of a spring-biased shift valve controls whether p...
11/08/2011
7878934Hydraulic control system of eight-speed automatic transmission for a vehicle
Eight forward speeds and one reverse speed of an automatic transmission are achieved by: controlling a first clutch by a first pressure control valve controlled a first proportional control solenoid valve and a first pressure switching valve; controlling a second cl...
02/01/2011
7666112Electro-hydraulic control system with multiplexed trim valves for a transmission
An electro-hydraulic control system is provided, preferably for a countershaft transmission, that uses logic valves to multiplex trim systems to more than one torque-transmitting mechanism, thereby minimizing the number of required components. Additionally, the elec...
02/23/2010
7658691Automatic transmission with improved shift quality
A modification to the manual valve of an automatic transmission is provided which improves the shift quality of the automatic transmission when the transmission is shifted from a drive gear to either Park or Neutral. More particularly, the invention provides a contr...
02/09/2010
7497799Torque transmitting mechanism engagement control system and method
A control system operable to engage a torque transmitting mechanism, the control system having at least one variable bleed solenoid valve operable to selectively provide pressurized fluid to selectively engage at least one torque transmitting mechanism. An electroni...
03/03/2009
7419452Control apparatus of vehicular automatic transmission
At the time of a failure in the second group of engagement devices, the manner of input of oil pressures to a fail-safe valve group is changed via a priority degree switching valve on the basis of the state of engagement of engagement devices of the first group in s...
09/02/2008
7390285Hydraulic control system of automatic transmission for vehicle
A hydraulic control system of an automatic transmission that precisely control is operating hydraulic pressure supplied to a frictional element during shifting and can eliminate oil leak under a maximum operating hydraulic pressure. The hydraulic control system cont...
06/24/2008
7364525Hydraulic control apparatus of automatic transmission
A hydraulic control apparatus is improved in reliability during a garage shifting with reducing costs of the apparatus. An electronic control unit controls equalizing the shift pattern (on-off pattern) during a first garage shifting when a manual valve is shifted fr...
04/29/2008
7347117Hydraulic linear drive of a transmission actuator
A hydraulic linear drive for a hydraulic vehicle transmission actuator has a piston/cylinder unit in which an adjusting piston is arranged so it is longitudinally displaceable in a cylinder housing and subdivides the cylinder space into at least two pressure spaces ...
03/25/2008
7344466Hydraulic control system of 7-speed automatic transmission for vehicle
A hydraulic control system of a seven-speed automatic transmission that provides enhanced overall performance by achieving precise and effective control by providing a fail-safe function in at least two ways. ...
03/18/2008
7331902Method for performing high throttle neutral to range shifts
According to a preferred embodiment of the present invention, a “special neutral” is commanded to initiate the neutral to range shift. The “special neutral” of the present invention is special in that while the transmission output speed remains unconstrained...
02/19/2008
7325885Regulator valve for a torque-transmitting mechanism and method of engaging a torque-transmitting mechanism
A regulator valve for controlling the pressure of fluid engaging a torque-transmitting mechanism in a transmission includes a valve body forming a valve bore of a plurality of passages. A spool valve slides within the valve body. A check valve selectively opens and ...
02/05/2008
7278944Hydraulic control apparatus for automatic transmission
An oil hydraulic circuit includes a B2 apply control valve establishing communication between a second feedback oil channel connected to a feedback pressure chamber and a drain port, and between a D 1st speed oil channel and a drain port when SL pressure is s...
10/09/2007
7192384Automatic transmission control device
An automatic transmission control device adjusts a hydraulic pressure of a working fluid to generate pressures applied to a plurality of friction elements of an automatic transmission to control the engagement or disengagement of the friction elements. The control d...
03/20/2007
7151989Twin-clutch gearbox and method for shifting an initial gear upwards into a target gear in the twin-clutch gearbox of a motor vehicle
The invention relates to a method for shifting an initial gear upwards into a target gear in a twin-clutch gearbox of a motor vehicle. According to the invention, the engine torque (MMotor) of the vehicle is altered when a target gear is selected incorrec...
12/19/2006
7140993Fly-by-wire limp home and multi-plex system
An electro-hydraulic control mechanism for use with a multi-speed transmission includes a pair of logic valves, which are manipulated during the ratio interchanges and the ratio establishment by aiding in the distribution of fluid pressure from a plurality of trim v...
11/28/2006
7134983Shift control method of automatic transmission for vehicles
A shift control method and system for an automatic transmission. The control method includes calculating a clutch engaging pressure for each shift speed corresponding to an engine load and calculating an optimal engaging pressure for an operating clutch in each shif...
11/14/2006
7134536Hydraulic control circuit for automatic transmission of vehicle
A hydraulic control circuit for an automatic transmission of a vehicle, the transmission including hydraulically operated coupling devices at least one of which is selectively operated to establish a corresponding one of speed steps, the hydraulic control circuit in...
11/14/2006
7128679Methods and systems for improving the operation of transmissions for motor vehicles
The present invention is directed to methods and systems for improving the operation of transmissions for automotive vehicles, and in particular the “factory installed” automotive transmissions installed by the original automobile manufacturer. The methods and s...
10/31/2006
7104911Hydraulic control device for automatic transmission
A hydraulic control device for an automatic transmission comprises an engagement element pressure control section for controlling an engagement element pressure, engagement elements supplied with the engagement element pressure, and an oil pressure switches provided...
09/12/2006
7066305Brake bands for an automatic transmission and method for controlling a gear shift in automatic transmission and feedback loop control system
A brake band shifting mechanism for an automatic transmission. The brake band shifting mechanism includes a brake band encircling a brake drum of the transmission. A first end of the brake band is mounted to a secured portion of the transmission by a first linkage a...
06/27/2006
7048104Selective bypass of solenoid-controlled supply to friction elements of an automatic transmission
A hydraulic system for controlling the engagement and disengagement of a friction element includes a source of line pressure, a source of exhaust pressure, a manual valve having a forward state and a reverse state, connected to the exhaust pressure source and line p...
05/23/2006
7004872Control method and device for automatic transmission
A control method for an automatic transmission is capable of quickly determining whether gear shifting is permissive. The control method varies the command value input to an engaging-side electromagnetic valve that adjusts a hydraulic pressure applied to a frictiona...
02/28/2006
6994648Fluid pressure control circuit
A pair of feedback chambers is provided in a supply/discharge switching control valve, and the hydraulic pressure is introduced from a portion on the upstream side of the orifice provided in the communication passage through the second feedback passage, and is intro...
02/07/2006
6966861Shift control for a two-axis automatic transmission for a vehicle
A shift control method for an automatic transmission having a primary shift portion and a secondary shift portion is provided that comprises: starting, if a shift signal is output, a shift in the secondary shift portion, and then starting a shift in the primary shif...
11/22/2005
6964628Methods and systems for improving the operation of transmissions for motor vehicles
Methods and systems for improving the operation of a transmission for an automotive vehicle are provided for modifiying the original hydraulic circuits to increase the capacity or holding ability of the low and reverse clutches when the transmission is shifted into ...
11/15/2005
6961646Automatic transmission control system with direct electronic swap-shift control
A control system and control method for an automotive vehicle having a multiple-ratio automatic transmission having two gearsets arranged in series relationship for delivering vehicle engine power to vehicle traction wheels, each gearset being controlled using frict...
11/01/2005
6942591Hydraulic control system of a six-speed automatic transmission
Each control portion for controlling each friction element includes a switch valve and pressure control valve such that hydraulic pressure supplied to the friction element is fully controlled, and a control portion for controlling a friction element that is operated...
09/13/2005
6920971Cushioned hydraulic clutch/brake piston
A hydraulic clutch/brake mechanism has an actuator piston assembly therein to control actuation of the associated clutch/brake. The actuator piston assembly has a damping arrangement disposed therein that is operative to damp the movement of the actuator piston asse...
07/26/2005
6915681Gear-shift control device and gear-shift control method for automatic transmission
An ECT-ECU includes a circuit that calculates an oil temperature threshold on the basis of a signal input from one of an engine coolant temperature sensor, an engine intake air temperature sensor, and an AT hydraulic fluid temperature sensor if a signal for starting...
07/12/2005
6916265Power transfer apparatus
A power transfer apparatus including a clutch having a biasing device for biasing the clutch piston in a direction in which the clutch discs engage with the clutch plates, a transmission brake disposed in line in an axial direction of the clutch, an actuator dispose...
07/12/2005
6913554Methods and systems for improving the operation of transmissions for motor vehicles
The present invention is directed to methods and systems for improving the operation of transmissions for automotive vehicles, and in particular the “factory installed” automotive transmissions installed by the original automobile manufacturer. The methods and s...
07/05/2005
6907974High performance intermediate servo assembly
A high performance intermediate servo assembly wherein the servo piston has been modified to provide at least a 17% increase in surface apply area and a corresponding increase in hydraulic pressure delivered to the 2nd gear clutch band which it actuates i...
06/21/2005
6896636Oil system
The oil supply device for a change-under-load transmission having a high-pressure circuit and a low-pressure circuit is designed in such a manner that the high-pressure feed line to the consumer devices of the transmission system incorporates an inlet aperture of sm...
05/24/2005
6860830Hydraulic control device for automatic transmission
There is provided a hydraulic control device for an automatic transmission, which is comprised of an engagement state determining section and a protection control section. If the engagement state determining section determines that each clutch, which is supplied wit...
03/01/2005
6846259Hydraulic control system for automatic transmission
A hydraulic control system for an automatic transmission includes a 3-4 shift valve that outputs a source pressure through a first path for shift speeds lower than a fourth shift speed established by directly connecting an input shaft with an output shaft of the aut...
01/25/2005
6805649Hydraulic control system for automatic transmission
A hydraulic control system, in which a powertrain of a 5-speed automatic transmission is controlled using five clutches and three brakes such that fuel consumption is reduced and engine torque is more efficiently utilized. The hydraulic control system includes four ...
10/19/2004
6729988Hydraulic system for automatic transmission for vehicle having idle-stop control
A hydraulic system for an automatic transmission for a vehicle with an engine having idle-stop control includes a bypass passage which allows communication between a first hydraulic passage downstream of a manual valve and a forward engagement element, a first switc...
05/04/2004
6729987Apparatus for controlling vehicle automatic transmission
Apparatus for controlling a vehicle automatic transmission having a hydraulically operated frictional coupling device operable to effect a shifting action of the automatic transmission, a switching valve operable according to a shifting command to effect the shiftin...
05/04/2004
6726595Oil pressure control apparatus for an automatic transmission
An oil pressure control apparatus for an automatic transmission helps ensure sufficient oil pressure to be supplied to a friction engagement element for performing at least either a first shift stage or a reverse shift stage. Further, the oil pressure control appara...
04/27/2004
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