Abstract: In an assembly of an electronic element (4) and a hydraulic element (3) of a control device (2) for the automatic transmission of a motor vehicle with a partially oil filled transmission housing wherein the control device (2) is arranged in the transmission housing wherein said control device (2) is arranged in the transmission housing and is at least partially surrounded by oil, the hydraulic element (3) has a valve housing (5) on which hydraulic valves (6), speed sensors (7, 8, 9) and pressure sensors (10, 11) are provided and is designed with a first housing part (5A) and a second housing part (5B). The first housing part (5A) has an at least approximately cuboid shape and is substantially arranged below a set of conical disks (1A) of a variator (1).

Abstract: Engine torque control system based on the dynamic behavior of a driven automatic transmission consists in that the engine dynamics is limited as function of a sporting mode.

Abstract: The invention relates to an automatic transmission of a motor vehicle which is controlled by an electronic transmission control system which continuously exchanges signals with a digital engine electronics system of an internal combustion engine. To reduce the thermal load on the automatic transmission in emergency operating mode, a transmission-independent program module (M1) of the digital engine electronics system sets an admissible maximum vehicle speed for the emergency operating mode (v_max_not) or an admissible maximum engine speed for the emergency operating mode (n_mot_max_not).

Abstract: Within the scope of the method for including the temperature in the calculation of the definite, operating-point dependent maximum and minimum adjustment speeds in a continuously variable belt-drive transmission, the actual limiting values for the maximum possible adjustment gradient are continuously calculated in every operating state by a physical-mathematical pattern wherein the hydraulic routes of the variator, the clutches integrated in the transmission and the lubrication are modeled as laminar inserts and the route of the control unit leakage as coupled laminar and turbulent hydraulic transmission elements.

Abstract: Within the scope of the method for ratio control of a continuously variable automatic transmission of a motor vehicle by means of a control loop structure which contains a non-linear compensation member for the variator and controllers for the pressures of both hydraulic routes of the variator pulleys and the variator routes, the control loop structure contains an interference variable observer which generates an interference force FL that reproduces the pattern precision wherein the interference force together with the set value for the adjustment gradient which is limited as result of external standards, forms the compensation member.

Abstract: The radial piston pump has a number of cylinder bores in a pump housing to accommodate pistons which slide into them; the cylinder bores are plugged by pressed-in stoppers (3) in which pressure channels are incorporated, all stoppers being sealed by a flat spring (6) which serves as return valve. To enlarge the outflow cross section through the pressure channels, each stopper 3 has at least one side discharge channel (8, 9).

Abstract: The device to control a continuously variable automatic transmission (CVT) having a first bevel pulley pair, upon an input shift and a second bevel pulley pair upon an output shaft and a belt drive organ extending between the bevel pulley pairs, wherein the movable parts of the bevel pulley pairs are displaced in an axial direction by electromagnetic actuators and hydraulic pressure regulating valves, as well as adjusting cylinders, comprises a closed hydraulic circuit regulated at a constant pressure so that leakage flows of the adjusting cylinders for the bevel pulley pairs and leakage flows of the pressure-regulating valves are delivered directly to a hydraulic constant pressure circuit such as the circuit provided for supplying the torque converter and to the secondary circuit serving for lubrication.

Abstract: A continuously variable transmission for motor vehicles having a first cone pulley pair and a second cone pulley pair over which runs a belt drive organ. Between the primary pulley (11) and a cover (2) in the transmission housing (1), there is provided for the fluid required to adjust the primary pulley (11), a primary pressure line extending substantially radially toward the center of the rotating primary shaft (12) and from which branches off a lubrication pressure line (8) for the rotating primary shaft (12). The fluid is conveyed between an inner cover (6) and the cover (2).

Abstract: A hydraulic system for pressure control of a variator (7) of an automatic transmission having an electronic transmission control is connected with a lubricant circuit (10) in which at least one lubrication valve (14) and one radiator (13) are situated. Oil is fed to the hydraulic system with the lubricant circuit (10), from an oil source (4). At the same time, a hydraulic emergency device is provided which has at least one emergency valve (29) to provide a constant pressure ratio between a primary pulley set (19) and a secondary pulley set (20) of the variator (7). In addition, the system has for reducing the thermal load in the emergency operation at least one device (35, 37, 43, 45, 46, 51) by means of which in emergency operation the oil flow through the radiator (13) is increased and the pressure on one output side of the radiator (13) is reduced.

Abstract: The invention relates to a method for manual control of the ratio of a continuously variable transmission (CVT) for a vehicle. The CVT has one control device, one shifting or selector device, one starting element and one variator for ratio adjustment and is driven by an internal combustion engine. The control device processes input signals derived from a driver-vehicle system within the scope of an operating strategy under the control of the reduction ratio, the rotational speed of the prime mover, or an input rotational speed of the variator. The operation strategy automatically selects in an automatic operating mode the transmission ratio. In a manual operating mode, the driver can engage directly in the selection of the transmission ratio via the shift or selector device. It is proposed that in the operating mode there is manually preset a signal proportional to the vehicle speed which is further processed as a theoretical guidance for the operating point of the engine-transmission unit.

Abstract: A method for ratio control for a continuously variable belt drive transmission with electrohydraulic control by means of a control loop with a linear PID controller with the theoretical ratio of the variator iv_theor.

Abstract: A system for control of a CVT driven by a drive unit has an electromagnetically controlled pressure-control valve which actuates both a main pressure valve and a secondary valve for the secondary pulley wherein geometry and spring tension of a main pressure valve and the secondary valve provide different characteristic lines.

Abstract: The invention concerns an automatic controlled transmission having a hydrodynamic converter (1) and a lock-up clutch (10) between an input shaft (7) and an output shaft (8) of the converter (1) wherein the lock-up clutch (10) is actuated by the differential pressure between an intake (14) and return flow (15) of the converter (1) and traversed by a coolant current. It is proposed that the coolant flow be controlled depending on the temperature of the oil. Thereby the transmitting capacity of the lock-up clutch (10) when engaged state is not impaired even when for cooling a larger coolant flow rate through the converter (1) is provided.

Abstract: The device for the control of an automatic transmission, especially a CVT, which is connected with an oscillatingly suspended drive mechanism, preferably an internal combustion engine for a motor vehicle with front-transverse drive mechanism, wherein the transmission has an electronic control, is provided with a sensor in the form of a piezoceramic transmitter on a torque support for the drive mechanism for producing high dynamic, to provide engine-torque equivalent signals which are fed to the electronic transmission control.

Abstract: The method for monitoring a continuously variable transmission (CVT) with a variator for adjustment of the speed ratio, which has its primary and secondary adjustment devices respectively controlled by a pressure-regulating valve, consists of a travel monitoring and/or pressure monitoring of the pressure-regulating valves wherein in case of detection of an incorrect operation the power-flow transmitting clutch is opened.