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| Number | Title | Issue Date |
| 7815545 | Hydraulic control system for automatic transmission An automatic transmission hydraulic control apparatus includes an oil pump driven by an engine, a forward clutch arranged to be engaged by an engagement pressure from the oil pump at a start of the vehicle, a hydraulic pressure sensing section configured to sense a ... | 10/19/2010 |
| 6945908 | Electronic transmission throttle valve actuator An automatic transmission that includes a housing, gear transmission unit, transmission throttle valve, and an electromagnetic actuator for the transmission throttle valve. The transmission housing has a support portion formed on an outside surface of the housing, a... | 09/20/2005 |
| 6805655 | Oil pressure control mechanism for automatic transmission Many vehicles designed for running on rough terrain include an automatic transmission for performing speed change by connecting or disconnecting an oil hydraulic clutch provided alongside each speed change gear. However, depending on the posture of the driver, it ma... | 10/19/2004 |
| 6514175 | Hydraulic control system for transmissions A hydraulic control system including: a rotating speed raising unit for raising the rotating speed of the prime mover while the transmission is not rotated by the prime mover, to increase an output volume of the hydraulic pump; at oil pressure instructor ... | 02/04/2003 |
| 6511401 | Shift control method for automatic transmission A shift control method for an automatic transmission improves shift feel and acceleration characteristics by determining if 4.fwdarw.3 shifting is required during lift-foot-up 3.fwdarw.4 shift control, and if so, the method controls a number of solenoid v... | 01/28/2003 |
| 6475113 | Hydraulic control system of automatic transmission A hydraulic control system includes switching mechanisms for receiving as a signal pressure 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 re... | 11/05/2002 |
| 6361472 | Controller for an automatic transmission In gear-shift control performed during normal travelling, a drive frequency of each solenoid valve is set to a higher one to suppress fluctuations or changes of a quantity or speed of a flow of a hydraulic oil concerned when the solenoid current is turned... | 03/26/2002 |
| 6343520 | Automatic transmission control system An automatic transmission comprises a forward/reverse selection hydraulic servomechanism 70 which actuates a dog clutch and a plurality of clutches 11, 12, 13, 14 and 15. For this automatic transmission, a control system comprises first~fifth on/off solen... | 02/05/2002 |
| 6258010 | Transmission shifting hydraulic control system A hydraulic control for an automatic shifting transmission has a plurality of shift logic valves, a high ratio control valve, a low ratio control valve and respective pressure control valves for controlling the bias pressure on the ratio control valves. T... | 07/10/2001 |
| 6032095 | Control apparatus for an automatic transmission of a vehicle and method An apparatus and method control an automatic transmission of an automobile. When a feedback control is executed by the automatic transmission while the speed is being changed, the control operation may often lose stability due to a large deviation between... | 02/29/2000 |
| 6022139 | Oil temperature detecting system and method for automatic transmissions In the oil temperature detecting method, an oil temperature sensor detects the temperature of oil in an automatic transmission. A controller receives the detected temperature and signals indicating a first and second potential. The first potential represe... | 02/08/2000 |
| 5984833 | Hydraulic control system for an automatic transmission used in vehicles Disclosed is a hydraulic control system for an automatic transmission including a plurality of friction elements associated with respective transmission speeds. The hydraulic control system includes a hydraulic fluid source, a line pressure controller, a ... | 11/16/1999 |
| 5919244 | Desired performance input fuzzy logic control system for automatic transmissions The invention concerns a control system for shifting gears in an automatic shift transmission (3) by using fuzzy logic methods. Vehicle parameters form input variables (8) that are continuously detected by appropriate means (9). These input variables are ... | 07/06/1999 |
| 5816977 | Oil pressure control system having an ON/OFF solenoid and a lowered electrical resistance pwm solenoid for controlling a pressure regulator An oil pressure control system for an automatic transmission for controlling the oil pressure of a frictional engagement element by a regulator valve for outputting an oil pressure according to a signal pressure inputted. The oil pressure control system c... | 10/06/1998 |
| 5785629 | Process for controlling an automatic gearbox The proposal is for a process for controlling an automatic transmission in which, on the basis of a speed-change demand, an electronic control device determines a mode of changing (F1, F2, F3), compares an existing operation point with a theoretical opera... | 07/28/1998 |
| 5762580 | Operating range selection of an automatic transmission A rotary switch, used to select the operating range of an automatic transmission, controls solenoid-operated valves corresponding to the selected range to open and close a connection between a range valve assembly and a control pressure source. A forward ... | 06/09/1998 |
| 5560248 | System for the assisted selection of the ratios of an automobile gearbox This assisted selection system comprises an electrohydraulic actuator (12) which controls the input element of the gearbox and may itself be controlled by parameters provided by the engine control computer. The actuator (12) comprises a group of solenoid ... | 10/01/1996 |
| 5523944 | Arrangement for automatically changing the transmission ratio of a speed-change gearbox of a motor vehicle with the effect of changing to a higher gear An electronically controlled arrangement for changing the transmission ratio of a speed-change gearbox of a drive assembly of a motor vehicle, in which a change with the effect of changing-up is prevented by an inhibiting signal formed as a function of pa... | 06/04/1996 |
| 5521818 | Shift solenoid functional test strategy for an automatic transmission control system having electronic shift controllers A diagnostic strategy for an automatic transmission having electronic shift control solenoids for controlling application and release of clutches and brakes during the establishment and disestablishment of torque ratios in multiple-ratio gearing for the t... | 05/28/1996 |
| 5507706 | Hydraulic control system of automatic transmission for vehicle A hydraulic control system of the present invention is provided for improving a responsiveness to a speed change by compleating the speed chang with a torque pressure control hydraulic pressure after initiating the speed change with the drive hydraulic pr... | 04/16/1996 |
| 5507197 | System for the assisted selection of the ratios of an automobile gearbox This assisted selection system comprises an electrohydraulic actuator (12) which controls the input element of the gearbox and may itself be controlled by parameters provided by the engine control computer. The actuator (12) comprises a group of solenoid ... | 04/16/1996 |
| 5501645 | Control system for vehicular automatic transmissions with a quick-shift hydraulic system for manual shifting A vehicular automatic transmission and control system therefor includes an automatic transmission including a planetary gear unit and a plurality of friction elements for connecting the components of the planetary gear unit selectively to rotary members o... | 03/26/1996 |
| 5460582 | Automatic transmission control system having electronic shift controllers and a solenoid valve diagnostic test during an upshift An automatic transmission having multiple-ratio gearing, fluid pressure-operated clutches and brakes adapted to establish and to disestablish multiple torque ratios and electronic shift control solenoids that can be energized and de-energized under the co... | 10/24/1995 |
| 5416700 | Scrolling gear ratio selection control system and method A control system and method for a semi-automatic mechanical transmission system (10) is provided for allowing operator request for a scrolling display of allowable ratios in either the upshift or downshift direction, and for a direct shift into the select... | 05/16/1995 |
| 5415603 | Hydraulic control system for hybrid vehicle A transmission in the hybrid vehicle taking the internal-combustion engine and the electric motor together. In the engine cruising mode, the clutch control valve 62 is adapted to feed the pressure oil in the hydraulic path A to the hydraulic servo C-1 and... | 05/16/1995 |
| 5410476 | Operation mode control system for use in automatic power transmission for selectively halting execution of hold mode An operation mode control system for an automatic automotive power transmission includes a manually operable mode selection switch for selecting an operation mode from among economy, power, and hold modes. When an acceleration demand magnitude is larger t... | 04/25/1995 |
| 5409434 | Control system with failsafe for shift-by-wire automatic transmission A control system for a shift-by-wire automatic transmission, comprises: a first range changing valve for having an input port switched to communicate with a first output port and a second output port; a second range changing valve for causing the first in... | 04/25/1995 |
| 5404301 | Method and apparatus of vehicle transmission control by assured minimum pulse width Pulse frequency modulation is used to control brakes and clutches which are operated by fluid pressure actuators controlled by electrically actuated solenoid valves. Short pulse periods for all duty cycles are generated by feedback from the solenoid valve... | 04/04/1995 |
| 5389050 | Vehicle automatic transmission control system using fuzzy logic to determine slope and an inferred driver's intention to decelerate (DEC) to determine the correct gear position In a control system for controlling a gear ratio of a multi-step geared or continuously variable automatic transmission, the driver's intention to decelerate is inferred by carrying out a first fuzzy reasoning using a degree of throttle opening or the lik... | 02/14/1995 |
| 5362286 | Automatic transmission with upshift prohibit dependent on throttle and vehicle speed An automatic transmission which includes a clutch (6); a clutch actuator (7) for detecting and controlling a position of the clutch; a transmission (1); a transmission actuator (2) for driving the transmission; a vehicle speed detector (22) for detecting ... | 11/08/1994 |
| 5329830 | Shift control apparatus for automatic transmission for vehicle A shift control apparatus for an automatic transmission of a vehicle wherein a plurality of speed ratios are achieved by electronically controlling individual hydraulic pressures supplied to a plurality of frictional engaging elements to selectively engag... | 07/19/1994 |
| 5315897 | Engine speed control system with changing shift-up speed An engine speed control system causes an engine, equipped with an automatic transmission which shifts up according to predetermined shift schedules, to reduce its output at a predetermined engine speed so as to protect the engine by preventing the engine ... | 05/31/1994 |
| 5262952 | Slip control system for motor vehicle A slip control system for a motor vehicle controls slips in driving wheels and includes a sensor for detecting a slip ratio of each driving wheel and a traction control system for decreasing a slip of each driving wheel by controlling a driving force tran... | 11/16/1993 |
| 5253550 | Fluid pressure control device for automatic transmission A fluid pressure control device having a timing valve with a spool which is adopted in an automatic transmission so as to operate in such a manner that a fluid pressure from a friction portion at a low speed side to the timing valve is drained rapidly the... | 10/19/1993 |
| 5147254 | Torque transmission unit for the drive connection of a secondary unit with an internal combustion engine A torque transmission unit is connectable to an internal combustion engine in order to drive a secondary unit with different transmission ratios in dependence upon the rotation rate of the internal combustion engine so that in the case of a low rotation r... | 09/15/1992 |
| 5138907 | Safeguard for shift control for auxiliary gearing of automatic transmission In an automatic transmission including an auxiliary gearing drivingly connected to a main gearing, the auxiliary gearing is shiftable between a high gear position wherein a direct clutch is engaged and a reduction brake is disengaged and a low gear positi... | 08/18/1992 |
| 5088357 | Automatic transmission control system A hydraulic control system shifts an automatic transmission into at least a reverse range and a drive range having several forward speed gears by selectively coupling a plurality of frictional coupling elements, including a reverse coupling element. The c... | 02/18/1992 |
| 4996894 | Fluid actuated switch valve in an automatic transmission A fluid actuated switch valve in a four-speed transmission to direct fluid flow between solenoid-actuated valves and a clutch apply piston in a low gear position and in a high gear position, while allowing one of the solenoid-actuated valves to also direc... | 03/05/1991 |
| 4896568 | Electric-hydraulic control Electro-hydraulic control for an automatic transmission (1) is disclosed with two primary shafts (11, 12), whereby the first shaft (11) is connected with a turbine (21) of a hydrodynamic unit (2) and the second shaft (12) is directly connected to the driv... | 01/30/1990 |
| 4881429 | Shift control arrangement for automatic transmission In order to obviate a knocking noise in a one-way clutch during upshifting under low engine load, a hydraulically controlled clutch, which is arranged in parallel therewith, is momentary supplied with line pressure.... | 11/21/1989 |
