| Patent application number | Description | Published |
|---|
| 20080202450 | Device for Uncoupling the Oil Flow Through a Radiator - A bypass valve for blocking oil flow through a radiator from a transmission with low oil temperatures includes an oil supply from the radiator, an oil supply, via a bypass line, an oil outlet and a valve unit arranged inside the valve housing. The valve unit includes a compression spring and a heat sensitive element, which move depending on the oil temperature such that when the temperature falls below a threshold value, the oil supply from the radiator is closed and the supply, via a bypass line, is opened. When the oil temperature rises above the threshold value, the oil supply from the radiator is opened and the supply, via the bypass line, is closed. The valve unit can be axially moved against the force of the compression spring, when a predefined oil pressure is reached, thus opening the supply, via the bypass line. | 08-28-2008 |
| 20080234099 | Control Valve Assembly for Controlling a Starting Clutch of an Automatic Transmission - The invention involves a control valve arrangement to activate at least one start-up clutch of a motor vehicle automatic transmission with at least one clutch control valve ( | 09-25-2008 |
| 20080234100 | Control Valve Arrangement for Controlling a Starting Clutch of an Automatic Transmission - A control valve arrangement having a clutch regulation valve ( | 09-25-2008 |
| 20080267255 | Temperature Sensor Arrangement in an Automatic Gearbox - A temperature sensor arrangement in an automatic transmission in which the temperature sensor ( | 10-30-2008 |
| 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 |
| 20100120583 | HYDRAULIC CONTROL APPARATUS OF AN AUTOMATED MULTI-STEP CHANGE-SPEED GEARBOX - A hydraulic control device with a plurality of gear-actuating cylinders for engaging and disengaging the gears of an automated multi-step transmission, with pressure-controlled gear-regulating valves for controlling the pressure in one pressure chamber of the cylinders, and with a multiplex arrangement of singly switchable pressure-controlled selector valves for assigning the regulating valves to one pressure chamber of the actuating cylinders. The device includes a common pilot valve, designed as a regulating valve, for actuating one of the regulating valves and at least one of the selector valves. The pilot valve features a first control pressure range that contains the switching pressure of the selector valve and a second control pressure range that contains the regulating range of the gear-regulating valve. | 05-13-2010 |
| 20100213401 | BYPASS VALVE FOR A COOLER CONNECTED DOWNSTREAM OF A HYDRAULIC UNIT - A bypass valve for a cooler connected downstream from a hydraulic aggregate. The bypass valve includes a housing with ports for connection to the hydraulic aggregate and the cooler. A closure element is located in the housing for closing and opening a bypass. A spring pushes the closure element into a closing position, and thermo-sensitive means causes the closure element to open if the temperature of the hydraulic fluid is below a threshold temperature. The thermo-sensitive means are formed by the valve spring, which is made of a memory-metal alloy with a transition point close to the threshold temperature such that below the threshold temperature it no longer exerts a force and allows the closure element to open. | 08-26-2010 |
| 20110031423 | HYDRAULIC CONTROL ARRANGEMENT FOR CONTROLLING A VARIABLE FLUID VOLUME FLOW - A hydraulic control system for controlling a variable fluid volume flow to a consumer ( | 02-10-2011 |
