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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7278953 | Transmission shift control method A method is provided for shifting a powershift transmission in a vehicle having an electronic engine control unit and an electronic transmission control unit. The method rapidly reduces off-going clutch pressure to a pressure which is slightly higher than a Predicte... | 10/09/2007 |
| 7247126 | Method and apparatus for shift control of an automatic transmission Whenever a 4 to 3 shift condition is satisfied during a 3 to 4 upshift, 4 to 3 shifting is started before the 3 to 4 shifting is finished. The 4 to 3 shifting is executed according to a predetermined hydraulic control pattern. Therefore, responsiveness in shifting i... | 07/24/2007 |
| 7243016 | Single wire dual speed signal system A control system and method for communicating with a transmission includes a transmission input speed sensor that generates an input speed signal. A transmission output speed sensor generates an output speed signal. A power supply supplies a total current to the tra... | 07/10/2007 |
| 7128084 | Self-cleaning valve assembly The present invention provides a method and apparatus for a self-cleaning valve assembly. The valve is adapted to cycle and thereby clean the valve assembly in response to one or more predefined parameters which are programmed into a programmable controller. The val... | 10/31/2006 |
| 7089102 | Coasting downshift control for automatic transmissions An automatic transmission ratio shift control system and method for a powertrain having an engine and multiple-ratio gearing controlled by friction elements actuated by hydraulic pressure, an electronic controller for establishing torque transitions among the fricti... | 08/08/2006 |
| 7079932 | Method for tie-up detection in an automatic transmission A method for detecting tie-up in an automatic transmission is provided. The rate of change of the output shaft acceleration is calculated by twice differentiating with respect to time the transmission output shaft speed. The calculated rate is then compared to a pre... | 07/18/2006 |
| 7074144 | Hydraulic control apparatus for vehicle with belt-drive continuously variable transmission Hydraulic control apparatus includes a belt-drive CVT, a pressure regulator valve (P.REG.V) regulating the oil pressure produced by an oil pressure source, a controller programmed to develop a transmission control signal, a transmission actuator driven based on the ... | 07/11/2006 |
| 7004872 | Control 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 |
| 6979280 | Control apparatus and control method for vehicle In a control apparatus for a vehicle, when a coast downshifting is performed in response to a downshifting command from a vehicle operator during braking operation under the fuel cut control, the braking force of the wheel brake is increased so as to increase the de... | 12/27/2005 |
| 6843756 | Downshift control apparatus of vehicular automatic transmission, and control method thereof In a vehicle in which a moderate throttle opening degree control of maintaining a degree of throttle opening that is less than a degree of throttle opening that corresponds to an accelerator operation is performed for a predetermined period following a beginning of ... | 01/18/2005 |
| 6835164 | Shift-control method for a vehicular automatic transmission A method for controlling a gear shift in an automatic transmission of a motor vehicle that is carried out as a deceleration shift of at least one engaging shifting element, without use of a mechanical free-wheeling condition. To increase the ride comfort, it is prop... | 12/28/2004 |
| 6832147 | Method and apparatus for controlling a vehicle with a gear-shift transmission In a vehicle with a gear-shift transmission of a kind that requires a torque-free state to shift gears, the riding comfort is improved by a method of shifting gears where a gear shift is preceded by the steps of: reducing the vehic... | 12/14/2004 |
| 6793602 | Automatic transmission control device and control method An automatic transmission control device controls multiple speed changes in which shifting from first speed to second speed occurs during shifting from second speed to first speed. The control device includes a shift lever position sensor, an ECT_ECU, and an AT line... | 09/21/2004 |
| 6508741 | Hydraulic control system for automatic transmissions A hydraulic control system for an automatic transmission, which has a frictional engagement unit adapted to be kept in a slipping state when in a predetermined speed changing state and in an applied state when in another gear ratio changing state; and a d... | 01/21/2003 |
| 6302822 | Hydraulic control system of automatic transmission A hydraulic control system includes switching mechanisms for receiving as a signal voltage a hydraulic pressure which is output from each shifting mechanism when all units of the shifting mechanisms are caused to output a hydraulic pressure, and being res... | 10/16/2001 |
| 6287238 | Forced downshift control method for automatic transmission A forced downshift control method for automatic transmissions, wherein, if shift signals of a forced 4-2 downshift are input, a first shift control solenoid valve (SCSV-A) is controlled to OFF; a second shift control solenoid valve SCSV-B is maintained in... | 09/11/2001 |
| 6277051 | Method for controlling manual downshifting in an automatic transmission A power-on manual downshift control method including the steps of determining if a power-on manual downshifting is being performed or not when a TCU receives a power-on manual downshifting signal, producing a duty control signal of 0% if power-on manual d... | 08/21/2001 |
| 6264580 | Control system for automatic transmission A control system for an automatic transmission, which is capable of controlling the hydraulic pressures for frictional engagement units when a predetermined shift is performed such that a first frictional engagement unit is engaged and a second frictional... | 07/24/2001 |
| 6193630 | Slip-based shift control system A powershift transmission of an engine-driven vehicle includes input and output shafts, a plurality of fluid pressure operated clutch for controlling flow of torque through the transmission and pressure control valves for controlling fluid pressure commun... | 02/27/2001 |
| 6149548 | Element overlap control for an automatic transmission The present invention provides a method for shifting from a first gear state to a second gear state which holds one element at a predetermined level until the second reaches its fill volume. In this method, one element is applied while the other element i... | 11/21/2000 |
| 6132334 | Control system for automatic transmission A control system for an automatic transmission, which is capable of controlling the hydraulic pressures for frictional engagement units when a predetermined shift is performed such that a first frictional engagement unit is engaged and a second frictional... | 10/17/2000 |
| 6042506 | Automatic transmission control having variable fluid pressure decreasing rate at gear shifting A vehicle automatic transmission control controls fluid pressure changes applied to a frictional engagement element which is being changed from an engaged state to a disengaged state at a stage before input shaft rotational speed starts to increase from t... | 03/28/2000 |
| 6007457 | Pressure control for a 4-3 downshift and a shift from neutral A hydraulic control system for automatic transmissions includes a pressure control valve for regulating hydraulic pressure generated by a hydraulic pump to line pressure, a manual valve for converting the line pressure from the pressure control valve into... | 12/28/1999 |
| 5971889 | Solenoid self-cleaning pressure valve for automatic vehicle transmission A system for controlling an automatic vehicle transmission, including a gear system and hydraulic clutches which hold a member of the gear system stationary to produce gear reduction or reverse, having an oil line which connects the clutches to an oil pre... | 10/26/1999 |
| 5957809 | Hydraulic control system for automatic transmissions to improve shift quality A hydraulic control system for an automatic transmission includes a pressure regulator to regulate hydraulic pressure produced by an oil pump; a manual and automatic shift controller to form shift modes; and a hydraulic pressure controller to regulate shi... | 09/28/1999 |
| 5911648 | Automatic transmission control method including shifting aberration regulating phase A method of controlling and regulating an automatic transmission with overlapping gearshifts. The change from the control mode to the regulating mode for the disengaging clutch (11) is made here when a defective engagement of the engaging clutch (12) is d... | 06/15/1999 |
| 5848951 | Control system of a downshift by an automatic transmission gear and method for the same A control system for downshifting an automatic transmission provides reduced shift shock by controlling pressure fed to a kickdown servo brake. A throttle valve sensor, an input shaft rpm sensor, an output shaft rpm sensor, and a transmission control unit... | 12/15/1998 |
| 5846163 | Shift control apparatus in vehicle automatic transmission In a shift control apparatus in a vehicle automatic transmission, up-shift is carried out from a low velocity step to a high velocity step. When a rotational blow is generated, a controlling device controls the releasing side element of frictional engagin... | 12/08/1998 |
| 5842951 | Speed change control system for automatic transmission A speed change control system for an automatic transmission for making a speed change of the automatic transmission by applying/releasing frictional engagement elements and for controlling a line pressure, to be fed to the frictional engagement elements, ... | 12/01/1998 |
| 5810693 | Automatic control system for automobiles An automatic transmission control system for an automatic transmission including a hydraulic pressure control circuit which supplies locking and unlocking pressures selectively to a plurality of friction coupling elements to lock and unlock the selected f... | 09/22/1998 |
| 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 |
| 5795265 | Process for controlling an automatic transmission A process is proposed for controlling an automatic transmission where changing from one gear speed to another is brought about as a result of a first clutch (11) opening and a second clutch (12) closing. It is further proposed to apply the process to a gr... | 08/18/1998 |
| 5778331 | Kickdown delay in cruise control for automatic transmission An interactive cruise control system and method for providing automatic speed control of a vehicle with improved shifting of an automatic transmission. The system and method controls speed of a vehicle equipped with cruise control and minimizes downshifts... | 07/07/1998 |
| 5769754 | Kickdown control method for automatic transmission A kickdown control method for automatic transmission wherein a transmission control unit TCU receives signals regarding three variables for a throttle opening rate just prior to an abrupt operation of the accelerator pedal, the vehicle speed and the throt... | 06/23/1998 |
| 5722913 | Process for controlling an automatic gearbox A process is proposed for controlling an automatic transmission wherein a transition occurs from a first, lower reduction step to a second, higher reduction step when a first clutch disengages and a second clutch engages and a synchronizer speed is calcul... | 03/03/1998 |
| 5707318 | Automatic transmission control device An automatic transmission control device for use in controlling an automatic transmission that includes a plurality of friction engaging devices disposed between the rotational shaft of the engine and the output shaft in order to control gear ratios inclu... | 01/13/1998 |
| 5571060 | Process for correcting the shifting quality of an automatic transmission The invention relates to a process for the adaptive correction of the shifting quality of an automatic transmission which is coupled to an engine and in which correcting elements acting on the pressure or oil throughput bring friction elements into engage... | 11/05/1996 |
| 5551931 | Method of and system for gear shift controlling for an automatic transmission An automobile automatic transmission shift control system causes a specific gear shift by locking a first frictional element and unlocking a second frictional element simultaneously. The system delays a commencement of the unlocking of the second friction... | 09/03/1996 |
| 5468198 | Method of controlling coastdown and coastdown/tip-in in an automatic transmission An electronic transmission coastdown shift control method in which the transmission controller has the capacity to predict timing of apply element application. The control method of the present invention improves the shift sequence by accurately prefillin... | 11/21/1995 |
| 5449330 | Epicyclic change-speed gearbox automatic gear-changing arrangement and method In an arrangement for automatically changing gear in an epicyclic change-speed gearbox from a previous gear, in which a first frictional connection (clutch or brake) is engaged, into another gear, in which a second frictional connection is engaged, the wo... | 09/12/1995 |
