| Patent application number | Description | Published |
|---|
| 20080217134 | Process for pressure actuation of a shifting element - The invention concerns a process for pressure actuation of a rotating shifting element of an automatic transmission or automated manual transmission, in which the shifting element is configured with a piston that interacts with a torque transfer element and a pressure medium supply, by way of which the piston can be actuated with pressure medium in order to be displaced into a positioned defined for an activated state of the shifting element, and in which a pressure pulse can be induced in the pressure medium supply in a de-activated state of the shifting element. It is proposed that the pressure medium pulse be triggered when the pressure medium amount drained from the de-activated shifting element has reached a predefined value. | 09-11-2008 |
| 20080275613 | METHOD FOR OPERATING A MULTI-STEP AUTOMATIC TRANSMISSION - Described is a method for operating a multi-step automatic transmission, particularly an automatic transmission of a drive train of a vehicle with a combustion engine. In downshifting from the third gear ratio to a second gear ratio, higher inertias must be shifted than when shifting from the third gear ratio to the first gear ratio. According to the invention, when there is a demand for a coasting downshift from the third gear ratio to the second gear ratio or to the first gear ratio with no performance demand on the combustion engine, the coasting downshift to the second gear ratio is not executed, and the first gear ratio is engaged when the requirements for downshifting to the first gear ratio are met. | 11-06-2008 |
| 20080296124 | Hydraulic System in Motor Vehicles - A hydraulic system in motor vehicles with at least one hydraulically actuated clutch, which entails minimized control complexity for supplying the clutch with hydraulic oil and which takes up less structural space. These characteristics are achieved essentially in that the pressure control of the hydraulically actuated clutch is effected directly and exclusively by an electrically driven and electronically controlled oil pump. | 12-04-2008 |
| 20090112425 | Method for Operating an Automatic Gearbox - A method of operating an automatic transmission of a motor vehicle, in particular a variable-speed transmission. The automatic transmission includes at least five shift elements, at least three of which are engaged in a forward and a reverse gear to transfer torque or force. When disengaging gears for shifting the automatic transmission from a forward or reverse gear to a neutral position, at least one of the at least three shift elements that are engaged in the respective forward or reverse gear is completely disengaged. | 04-30-2009 |
| 20090176612 | Method for Operating an Automatic Gearbox - A method for operating an automatic transmission of a motor vehicle, in particular a variable-speed automatic transmission. The automatic transmission has five shift elements and for transferring torque or force in a forward gear and in a reverse gear at least three of the five shift elements are engaged. In a neutral position of the automatic transmission, to prevent torque or force flow at least one of the shift elements that are engaged in the respective forward or reverse gear is fully disengaged. | 07-09-2009 |
| 20090206292 | METHOD OF OPERATING A TRANSMISSION SYSTEM VALVE CONFIGURATION - The invention describes a method for operating a transmission's valve system of a vehicle's drive train through a valve unit and said valve unit's electro-magnetic activator configuration. In a transmission's hydraulic system and being part of the vehicle's drive train, its hydraulic pressure value (p_EDS) can be employed and adjusted through a valve unit's configuration by applying to the electro-magnetic activator system a pulse-width-modulated current signal (i_EDS). The pulse-width modulated current signal (i_EDS) and its signal's amplitude (A) and/or its pulse duration (pw | 08-20-2009 |
| 20090249777 | TRANSMISSION DEVICE WITH AT LEAST ONE FORM-FIT SHIFTING ELEMENT BEING HYDRAULICALLY ACTUATED VIA A HYDRAULIC SYSTEM - A transmission device ( | 10-08-2009 |
| 20090250310 | TRANSMISSION APPARATUS COMPRISING AT LEAST ONE POSITIVE SHIFTING ELEMENT HYDRAULICALLY ACTUATED BY WAY OF A HYDRAULIC SYSTEM - A transmission apparatus ( | 10-08-2009 |
| 20090280951 | METHOD FOR OPERATING A VEHICLE DRIVETRAIN - A method for operating a vehicle drivetrain ( | 11-12-2009 |
| 20100042302 | METHOD FOR THE EMERGENCY ACTUATION OF AN AUTOMATED DOUBLE CLUTCH TRANSMISSION OF A MOTOR VEHICLE - A method for emergency actuation of an automated dual-clutch transmission of a vehicle with electrohydraulic control via a transmission control device. The method includes disengaging one clutch of the dual-clutch transmission, in order to realize emergency operation of the transmission and applying pressure on the other clutch after an error signal is transmitted indicating a malfunction of the transmission and/or the transmission control device. In order to keep the complexity of the hardware of the hydraulic system low, both clutches are disengaged, when an error signal occurs, and adjusted to a safe initial state, and an actuating pressure is only re-applied to one of the two clutches after the initial state is reached. In addition to the already existing elements of the hydraulic system, only one device or software is required which detects and selects the clutch that is more advantageous for continued driving operation. | 02-18-2010 |
| 20100081543 | VALVE ARRANGEMENT IN A HYDRAULIC CONTROL UNIT - A pressure (p | 04-01-2010 |
| 20100204893 | PROCESS FOR MONITORING THE DIRECTION OF FRICTIONAL DRIVE FROM A VEHICLE TRANSMISSION AT NEAR-ZERO VEHICLE SPEED - A process of monitoring a drive direction of an automatic or automated vehicle transmission at near-zero vehicle speed via an engaged gear. A desired direction of drive of the transmission is determined from an engaged gear at the time the vehicle begins motion. An actual direction of drive is determined from the transmission and, if different from the desired direction of drive, an error signal is produced. The process includes determining the actual drive either from a sensed rotational direction of a transmission input shaft and a sensed rotational direction of a transmission output shaft or a sensed valve setting, a sensed pressure in an transmission electro-hydraulic control system or on a transmission shifting element or from a sensed direction of rotation of a transmission gearset element or from axial movement or force of a transmission constructional element. | 08-12-2010 |
| 20100216597 | HYDRAULIC SYSTEM OF A GEAR BOX - An automatic vehicle transmission comprises a first oil supply unit ( | 08-26-2010 |
| 20110027105 | OIL PUMP FOR AN AUTOMATIC TRANSMISSION AND CONTROL METHOD THERETO - A transmission oil pump for an automatic transmission of a motor vehicle. The speed of the oil pump can be shifted by a transmission ( | 02-03-2011 |
