Abstract: A vehicle includes a transmission having a torque converter, an oncoming clutch, and a controller. The controller is programmed to, in response to a torque of the oncoming clutch exceeding an estimated average by a threshold during an engagement, increase the torque of the oncoming clutch via a feedforward command and adjust the torque of the oncoming clutch via a feedback command to compensate for deviations in the torque generated by the feedforward command during the engagement.

Abstract: A method for controlling a manual transmission includes using a controller to determine a desired torque transmitted through an input clutch for the desired gear after a shift lever is moved to a desired gear position and while a clutch pedal is being released for engaging the clutch; inferring torque in the vehicle drive assembly; using inferred torque to determine clutch torque; and using the controller to automatically adjust a clutch actuator such that a difference between the desired torque and the inferred torque is reduced.

Abstract: A transmission and control method are disclosed which ensure proper stroke pressure and minimize torque transients during a shift event. The transmission includes a clutch having a torque capacity based on a fluid pressure, a torque sensor adapted to measure a torque value that varies in relationship to the torque capacity, and a controller. The method includes varying the fluid pressure around a predetermined value, measuring a resulting torque difference with the torque sensor, and adjusting a clutch control parameter if the resulting torque difference is less than a threshold value.

Abstract: A transmission and control method are disclosed which ensure proper stroke pressure and minimize torque transients during a shift event. The transmission includes a clutch having a torque capacity based on a fluid pressure, a torque sensor adapted to measure a torque value that varies in relationship to the torque capacity, and a controller. The method includes varying the fluid pressure around a predetermined value, measuring a resulting torque difference with the torque sensor, and adjusting a clutch control parameter if the resulting torque difference is less than a threshold value.

Abstract: A hydraulic one-way clutch assembly (HOWC) is configured for use in a vehicle transmission. The HOWC assembly includes a non-rotatable disc and a rotatable disc. The non-rotatable disc extends about an axis and defines at least one exhaust port extending therethrough. The rotatable disc extends about the axis and is disposed axially adjacent the non-rotatable disc. The rotatable disc is configured to rotate relative to the non-rotatable disc, about the axis, between a closed position and an open position. The rotatable disc covers the exhaust passage when the rotatable disc is in the closed position to prevent fluid from flowing out through the at least one exhaust port. The rotatable disc uncovers the exhaust port when the rotatable disc is in the closed position to allow fluid to flow out through the at least one exhaust port.

Abstract: A power transmission device includes a rotatable input member, a rotatable output member, a clutch assembly to selectively transfer torque between the input member and the output member, and a controller for controlling the clutch assembly. The controller controls the clutch assembly based at least partly on a torque request.

Abstract: A device for damping vibrations, in particular a torsion vibration damper with a primary component and a secondary component, coupled together through a torque transfer device and a damping coupling device. The torque coupling device includes a ramp mechanism for converting a rotation of one of the two elements, primary component or secondary component, into an axial force proportional to the input moment, which acts upon the other element. A device for compensating the resulting axial forces for generating an opposing force, opposing the resulting axial force, wherein the input moment is designed for a mean input torque. A conversion device is also provided, which directly converts an occurring force difference between the resulting axial force and the opposite force into a control variable for operating an actuation device in the device for damping vibrations, whereby an adaptation of the opposite force is performed.

Abstract: The safety coupling includes a driving part (10) and a driven part (12) able to rotate around the same rotation axis (X) and respectively provided with first torque transmission means (14, 24) and with second torque transmission means (30, 36, 40, 52, 60, 62) having front toothings (24, 40, 60, 62) normally meshing with each other for the transmission of torque between the two parts of the coupling (10, 12). The safety coupling also includes torque-sensitive opening means (66, 72, 110) arranged to disengage the front toothings (24, 40, 60, 62) of the first (14, 24) and second (30, 36, 40, 52, 60, 62) torque transmission means, thus interrupting the torque transmission, when the torque transmitted between the two parts of the coupling (10, 12) exceeds a gi ven maximum value.

Abstract: A power transmission device includes a rotatable input member, a rotatable output member, a clutch assembly to selectively transfer torque between the input member and the output member, and a controller for controlling the clutch assembly. The controller controls the clutch assembly based at least partly on a torque request.

Abstract: A power transmission device includes a rotatable input member, a rotatable output member, a friction clutch to selectively transfer torque between the input member and the output member, an actuator providing an actuating force to the friction clutch and a controller. The actuator includes an electric motor having an output shaft drivingly coupled to a gerotor. The gerotor is operable to supply pressurized fluid to a piston acting on the friction clutch. The controller controls the actuator in response to a four-wheel lock request to provide one of a minimum output torque and an output torque greater than a vehicle requested torque to operate the friction clutch in a locked mode.

Abstract: A method and a device for controlling an automatic or automated clutch (4) of a vehicle, by a pressure fluid drive actuator (6) whereby the waypoint of a part (piston rod 12), connected with the drive actuator (6), is captured via a displacement sensor (28) and entered, as a control parameter, into a clutch control interacting with the vehicle control system (26). Provision is made for a diversified redundancy by use of a pressure sensor (30) measuring the fluid pressure in the drive actuator (6). The pressure sensor (30) monitors and stores the pressure in the drive actuator (6) and pressure changes, when engaging or disengaging the clutch, as a curve in the vehicle control system (26). Hereby, the level of engagement of the clutch is represented by the waypoint of drive actuator (6) by the pressure in the drive actuator (6) so that, if there is a malfunction in the displacement sensor (28), an emergency drive function is maintained.

Abstract: The invention relates to a device and to a method for controlling a coupling system having a coupling provided with a hydraulic actuation system, which includes an adjustable coupling part for connecting and separating a power transmission path between a coupling input side and a coupling output side, a hydraulic connection that connects the actuation unit to an electrohydraulic actuator that is arranged outside the coupling, and a control unit for controlling the actuator. The hydraulic connection forms a hydraulic system together with hydraulic components of the actuation unit and the actuator. According to the invention, a mechanical stop that delimits the adjustment of the coupling part on the actuation unit is formed. A pressure sensor monitors the pressure in the hydraulic system or a control signal of the actuator.

Abstract: A method for controlling an automated friction clutch arranged in a drive train of a motor vehicle in the force flow between a drive engine (3) and a drive transmission (4), which is configured to close passively by spring pressure and can be disengaged and engaged by way of a pressure-medium-actuated clutch actuator (14), such that the actuation position x_K of the clutch actuator (14) or of an associated transmission element is determined and used for controlling the friction clutch (2). To improve the accuracy and reliability of the clutch actuation it is provided that in addition, an actuating pressure p_K of the clutch actuator (14) is determined and that a required change of the clutch torque M_K to a new nominal value M_K_soll takes place under pressure control, in that the actuating pressure p_K of the clutch actuator (14) is set to a nominal value p_K_soll which corresponds to the nominal value M_K_soll of the clutch torque M_K.

Abstract: A method for determining a torque characteristic of a friction clutch located in a drive train of a motor vehicle in the force flow between a drive engine and a transmission and which is closed in its rest position. At least two marker points of a regulating-path-dependent torque characteristic are determined, one of which is determined at a slipping limit of the clutch. To enhance determination of the torque characteristic, a first marker point is determined with the clutch engaged, the transmission in neutral and the engine running, by slowly disengaging the clutch until a reduction in the speed of the transmission input shaft relative to the engine speed is detected. A corresponding pair of values of this marker point with the known braking torque of the input shaft and the set position are used for adapting an existing characteristic.

Abstract: A clutch including two rotary shafts, one of which is connected to one or more first clutch plates which cooperate with a second set of clutch plates, the clutch plates acted on by an actuating piston positioned within a two chamber hydraulic cylinder. A torque control valve comprising a cylindrical inner valve member rotatably and linearly movably received in a cylindrical opening in an outer valve member. Each valve member having elongate recesses positioned such that longitudinal movement of the inner valve member within the outer valve member will vary the degree of communication between the first and second elongate recesses connected to two hydraulic fluid sources of differing pressures. The second clutch plates are connected to one side of a spring of predetermined spring rate, which is also connected to one of the valve members, and the other side of the spring is connected to the other of the valve members and to the other rotary shaft.

Abstract: Pump pressure output can be controlled as temperature changes by a temperature compensation element. The present invention provides a shear channel constructed out of two or more materials enabling a pump to have a pressure profile as a function of temperature for a viscous fluid. The channel height varies as a function of temperature when the channel walls and temperature compensation element are constructed from materials having different coefficients of thermal expansion. By selecting a combination of materials, the channel height can increase, decrease, or remain constant as the temperature is changed. Ignoring the effects of viscosity, channel length, and relative speed the effect of channel height on pump output pressure is assessed: by increasing channel height as temperature increases, the pressure will decrease; by keeping the channel height constant as temperature increases, the pressure will remain constant; and by decreasing channel height as temperature increases, the pressure will increase.

Abstract: A device for transmitting torque between two rotatable, coaxial shaft members (1, 2) contains a clutch (35) between the two shaft members and engageable—to counteract rotational speed differential between the shaft members—by a hydraulic piston (18) under the control of an electrically controlled throttle or pressure valve (26), and a clutch pump (36) for supplying hydraulic pressure to the hydraulic piston, the clutch pump being driven by either one or both of the shaft members. The hydraulic piston (18), the valve (26), and the clutch pump (36) are connected in a hydraulic system also containing a feeder pump (31) for maintaining a certain base pressure in the system. The hydraulic system conditionally allows flow from the feeder pump (31) past the valve (26) to the hydraulic piston (18) irrespective of the flow from the clutch pump (36).

Abstract: A friction coupling assembly for a gear drive unit. The friction clutch assembly comprises an input member and at least one output member, a friction clutch for selectively coupling the input member with the at least one output member and an actuator assembly for selectively engaging the friction clutch. The actuator assembly includes a fluid pump operatively connected to the input member or the at least one output member through an auxiliary clutch, a fluid pressure accumulator in fluid communication with the fluid pump for storing a pressurized fluid generated by the fluid pump, and a fluid clutch actuator in fluid communication with the pressure accumulator for loading the friction clutch.

Abstract: A device for transmitting torque between two rotatable, coaxial shaft members contains a clutch between the two shaft members and engageable to counteract rotational speed differential between the shaft members by a hydraulic piston under the control of an electrically controlled throttle or pressure valve, and a clutch pump for supplying hydraulic pressure to the hydraulic piston, the clutch pump being driven by either one or both of the shaft members. The hydraulic piston, the valve, and the clutch pump are connected in a hydraulic system also containing a feeder pump for maintaining a certain base pressure in the system. The hydraulic system conditionally allows flow from the feeder pump past the valve to the hydraulic piston irrespective of the flow from the clutch pump.

Abstract: The present invention presents a method for operating a motor vehicle which has at least one clutch device. The method includes determining at least one part of a dependence of a path of at least one clutch characteristic on at least one pressure value. The pressure value relates to a pressure of a hydraulic fluid at a predetermined site. According to one embodiment of the present invention, the hydraulic pressure is detected in an area of a torque sensor which produces the hydraulic pressure dependent on a size (magnitude) of an engine torque.

Abstract: An apparatus and a method for controlling hydraulic pressure are provided, which has such advantages that a generation of peak pressure (shoot pressure ) can be lowered, mis-operation due to biting of particles can be reduced, or the cost thereof can be reduced.

Abstract: A fluid operated selectively engageable torque transmitter has a fluid operated piston that is pressurized to initiate engagement of a plurality of friction plates. The plates are alternately splined to an input member and an output member. One of the input or output members has a hub member threadably engaged therewith. The hub member has one set of plates and an apply plate splined thereto. Also connected with the threaded hub is a reaction plate. When the piston is lightly pressurized, the hub will traverse the input or output member on which it is threaded until the apply plate abuts a reaction surface on the member at which point the torque transmitter will be fully engaged. Upon a torque reversal, the threaded hub will traverse in the opposite direction to disengage the torque transmitter, thereby providing a direction sensitive mechanism. When the piston is fully pressurized, the torque transmitter will respond in a normal manner to transmit torque in both directions.