Abstract: Various embodiments of methods, apparatus and systems that calibrate main modulation of an electro-hydraulic control system for a vehicle transmission are presented. Some embodiments calibrate regulator control signals that cause a main regulator valve to develop a main line pressure based upon status of a control main valve that develops a control main pressure based upon the main line pressure.

Abstract: A method of controlling an automated transmission with positioning cylinders (6, 8, 20) controlled by shift valves or venting valves (10, 12, 16, 18, 22, 24). At least one cut-off valve (4) is positioned in front of the shift or venting valves and a control device controls the valves while pressure pipes, which follow the cut-off valve (4), are connected with one another following the cut-off valve (4). Due to the fact that the cut-off valve (4), for reasons of design simplicity and cost, is generally designed as a simple 2/2 way valve which only allows pressure increase but not pressure reduction, the method provides control of the shift valves or ventilation or venting valves (16, 18), of a non activated positioning cylinder (8), so that the pressure pipe system is connected with an outflow pipe (14) for a pressure reduction in the pressure pipe system (30, 32, 34).

Abstract: A method of adjusting a pressure signal to an actuator piston to control movement of a synchronizer actuator fork of a transmission includes moving the synchronizer actuator fork from a start position into a target position by applying an initial fluid pressure value. The time required to move the synchronizer actuator fork is measured to define a measured actuation time, and compared to a target actuation time. A correction factor is applied to the initial fluid pressure value to define a revised fluid pressure value when the measured actuation time is not within a pre-defined time range of the target actuation time. When the measured actuation time is greater than the pre-defined time range of the target actuation time, the initial fluid pressure value is increased. When the measured actuation time is less than the pre-defined time range of the target actuation time, the initial fluid pressure value is decreased.

Abstract: A method in which the control lockup relay of a “factory installed” A750E, A750F, or A761E automotive transmission is removed from the original valve bore in which it is received, the width of the valve bore in enlarged, and the original control lockup relay is replaced by a wider control lockup relay accommodated in the enlarged valve bore for preventing cross-leaking between an hydraulic circuit applying pressure to the relay and an exhaust to maintain a predetermined applied pressure for normal operation of the relay. The control valve plunger of the lockup control valve of the “factory installed” transmission is replaced by a wider control valve plunger for preventing leaks between the hydraulic circuit applying hydraulic fluid pressure to the lockup control valve and an exhaust for maintaining the hydraulic pressure applied to the lockup control valve above a predetermined pressure for preventing erratic operation of the lockup control valve.

Abstract: A hydraulic control system for a continuously variable transmission includes a pressure regulator subsystem, a ratio control subsystem, a torque converter control (TCC) subsystem, a variable lubrication control subsystem, a variator clamping subsystem, and a clutch control subsystem. The variable lubrication control subsystem allows for increased and decreased oil flow to components of the variable transmission based on demand. The pressure regulator subsystem provides binary line pressure control to the lubrication subsystem.

Abstract: Provided an electrically-operated hydraulic actuator unit that includes an electrically-operated motor controlled by a control apparatus and actuating a volume adjusting mechanism through driving-side and driven-side arms, and a clutch mechanism in which the driven-side arm presses a contact member against a clutch case so that the driven-side arm is locked when a force from the volume adjusting mechanism is applied to the driven-side arm. The control apparatus can set duties of first to fourth drive signals to be output to the electrically-operated motor in a neutral-side start period, a neutral-side ordinary actuation period, a higher-volume-side start period and a higher-volume-side ordinary actuation period. The duties of the first and fourth drive signals are larger than that of the second drive signal, the duty of the third drive signal is larger than that of the fourth drive signal, and an integrated ON-time of the third drive signal is larger than that of the first drive signal.

Abstract: A hydraulic control system for a transmission of a motor vehicle includes a source of pressurized hydraulic fluid that communicates with an analog electronic transmission range selection (ETRS) subsystem or a manual valve. The ETRS subsystem includes an ETRS valve, a park servo, a park mechanism, a mode valve, and a plurality of solenoids. The ETRS and manual valve communicate with a clutch actuator subsystem that engages a one-way clutch and six clutches/brakes.

Abstract: A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid that communicates with an electronic transmission range selection (ETRS) subsystem. The ETRS subsystem includes an ETRS valve, a park mechanism, a mode valve, a latch valve assembly, and a plurality of solenoids. The ETRS subsystem is configured to provide desired operating conditions during a plurality of potential failure conditions.

Abstract: A hydraulic control system for a transmission is provided. The hydraulic control system includes a source of pressurized hydraulic fluid that communicates with a discrete electronic transmission range selection (ETRS) subsystem. The hydraulic control system includes first and second mode valves located downstream of a hydraulic fluid pressure source. The mode valves are supplied with fluid via one or more solenoid valves or other valves. The mode valves have a plurality of ports configured to transfer pressurized hydraulic fluid. The first mode valve transfers pressurized hydraulic fluid from the source to the second mode valve. The second mode valve transfers pressurized hydraulic fluid from the first mode valve to one of drive or reverse. An electro-hydraulic circuit for pulling the transmission out of park and putting the transmission into park is also provided. A park sensor assembly including a Hall Effect sensor switch is also provided.

Abstract: An electro-hydraulic control apparatus for a motor-vehicle transmission having at least five forward gears and one reverse gear, including first, second and third shift forks, each movable in at least one engagement position to engage a respective gear, first, second and third hydraulic actuators each arranged to control the movement of a respective shift fork in the respective at least one engagement position, and a slide valve selectively movable into one of at least three operating positions in each of which the slide valve selects a respective hydraulic actuator, wherein a first operating position is an end-of-travel position and corresponds to the selection of the first hydraulic actuator, and wherein a second operating position is also an end-of-travel position and corresponds to the selection of the second hydraulic actuator.

Abstract: An oil pressure control device includes: line pressure adjusting means for adjusting the line pressure; line pressure switching means for switching, in two stages, the line pressure adjusted by the line pressure adjusting means; a linear solenoid valve that adjusts a required oil pressure for engaging frictional engagement elements with one another by engagement force, which is required thereby, by adjusting a pressure of hydraulic oil with the line pressure; and control means for controlling a value of a current supplied to the linear solenoid valve. The control means performs control to differentiate the value of the current, which is supplied to the linear solenoid valve in order to adjust (obtain) the same required oil pressure, in response to the line pressure switched by the line pressure switching means.

Abstract: A synchronizer actuation assembly for actuating at least one synchronizer member includes a barrel cam, at least one shift fork, a hydraulic piston assembly, and a motion converter. The barrel cam includes at least one cam groove that circumscribes the barrel cam and defines at least a neutral position and a first engaged position. The at least one shift fork has a first end portion disposed in the at least one cam groove and a second forked end portion. The hydraulic piston assembly includes a housing and a piston disposed in the housing. The motion converter includes a translatable input member engaged with the piston of the hydraulic piston assembly, a rotatable output member rotatably coupled with the barrel cam, and a direction selection mechanism. The translatable input member is selectively rotatably coupled with the rotatable output member in a first rotational direction or a second rotational direction.

Abstract: A shifting device (11, 40) with a servo-assistance mechanism (10), in particular for a transmission (30) of a motor vehicle which comprises an assembly for selecting and engaging a gear of the transmission (30) and an element (20) upon which acts a manual shifting force to be assisted. The servo-assistance mechanism (10) can produce a performance characteristic curve which, as a function of the manual shifting force or a shift phase, has ranges with different gradients or proportions with respect to the manual shifting force. Elements (88, 90, 106, 108), upon which a servo-pressure acts, are present in the servo-assistance mechanism (10) for producing the characteristic. In the control system of the servo-assistance mechanism (10), path limitation units and at least one elastic element (84, 110) are provided, upstream from and/or in the servo-assistance mechanism (10), to limit the servo-assistance force in a path-dependent manner for each gate or gear.

Abstract: A manual valve is formed with a drain input port that closes if a shift is made to the D position, and opens for draining if a shift is made to the N position. A switching valve communicates an output port of a pressure regulating valve portion and an oil passage of a clutch and closes a drain port during engine operation when a line pressure is applied, and cuts off communication between the output port of the pressure regulating valve portion and the oil passage of the clutch and communicates the oil passage with the drain port during an engine automatic stop when the line pressure is not applied. The drain input port and the drain port are connected by a drain oil passage.

Abstract: A control for a multi-speed automatic vehicle transmission is provided. Electrical and hydraulic components are provided, including pressure control or “trim” valve systems in fluid communication with shift valves and electrohydraulic actuators to selectively engage and disengage the transmission clutches or other shift mechanisms. Pressure switches are provided for the trim valves and shift valves. The fluid connections between the trim valve systems and the shift valve systems are configured to reduce the total number of valves and fluid passages required and to reduce the size of at least one of the valves. Clutch blocking features are provided. Power off limp home and reduced engine load at stop features are provided in all forward ranges, and control of double transition shifts is also provided.

Abstract: A control apparatus for an automatic transmission including three frictional engagement elements is configured to set engagement pressures of first and second frictional engagement elements at the time when a predetermined shift speed is established such that a torque capacity of a third frictional engagement element becomes smaller than torque capacities of the first and second frictional engagement elements in the case where an engagement pressure is generated in the third frictional engagement element at the time when the predetermined shift speed is established.

Abstract: Provided is a range switching device for performing switching among drive, reverse, and neutral ranges of a transmission. The device includes a first switching valve driven by a first actuator and a second switching valve driven by a second actuator. The valves switch an oil channel to transmit the oil pressure from an oil pressure supply source between first state and second states. When the first and second switching valves are in the first and second states respectively, the oil pressure is transmitted to the forward fastening element. When the first and second switching valves are in the second state and first states respectively, the oil pressure is transmitted to the reverse fastening element. When both the valves are in the first or second state, oil pressure transmission to the forward and reverse fastening elements is substantially blocked.

Abstract: A method of determining an operating state of a form-locking shift element of a transmission apparatus that, at least for changing one operating state between a disengaged operating state and an engaged operating state, is pressurized with an actuating pressure by a pressure-conducting region of the transmission apparatus. The pressure of the pressure-conducting region is monitored. Depending on the progression of the pressure of the pressure-conducting region, while pressurizing the form-locking shift element with the actuating pressure for changing the operating state, checking whether the form-locking shift element has the requested operating state.

Abstract: A range switching device for performing switching the range of a transmission includes first control valve, a second control valve having a characteristic opposite to the first control, and first, second, third and fourth switching valves for controlling the transmission of oil pressures. The first and second switching valves cooperatively control the transmission of the oil pressure from the first control valve to a forward or reverse driving element (R). The third and fourth switching valve cooperatively control the transmission of the oil pressure from the second control valve to the forward or reverse driving element (R). The third and fourth switching valves each perform a substantially same oil pressure transmission when the state of the second and third actuators is reversed with respect to the first switching and second switching valves, respectively.

Abstract: An operating device with an operating lever for a control valve includes: an input member connected to the operating lever; an output member connected to a slide spool of the control valve; and a swing link for relaying a displacement of the input member to the output member. The swing link is swingable about a swing shaft center on one end and is connected to the input and output members. A latch portion in the swing link is farther than a connecting point with the output member from the swing shaft center. A lock body is switchably operable between a lock position and a release position, and at the lock position, engaged with the latch portion at a neutral position to limit a swing of the swing link about the swing shaft center by which the control valve is locked at a neutral state.

Abstract: A shift by wire control for a multi-speed vehicle transmission is provided. The control includes a shift by wire shift valve in fluid communication with other shift valves and clutch trim valves to provide double blocking features in the neutral range and a reverse range. The shift by wire valve is configured with multiple differential areas to provide failure modes for all forward ranges.

Abstract: An oil supplying assembly for a transmission of a vehicle, which may supply oil to a clutch and a pulley of a transmission, may include a base member which is mounted to a transmission main body, and includes a first oil path supplying the oil to the clutch and an oil supply column which is integrally formed to the base member and of which a second oil path for supplying the oil to the pulley is formed thereto.

Abstract: An automatic transmission having high pressure actuation and low pressure lube includes a hydraulic circuit (110) having a source of pressurized fluid (112), an actuation circuit (114) that delivers pressurized fluid to actuate components of the transmission, and a cooling circuit (116) used to cool components of the transmission. The source of pressurized fluid includes a motor 118, a first pump 120 operatively driven by the motor 118, and a second pump 122 selectively driven by motor 118. A clutch mechanism 124 is connected between the motor 118 and the second pump 122 so as to selectively engage and disengage the second pump 122 in driven relationship with the motor 118 so that the second pump 122 selectively supplies pressurized fluid to the cooling circuit 116 when the clutch mechanism 124 is engaged.

Abstract: Shift arrangement for a motor vehicle gearbox. The shift arrangement has a shift element which can be connected or is connected to a shift member. The shift arrangement has a hydraulic actuator by means of which the shift element can be moved in a first shifting direction and in an opposing second shifting direction. The hydraulic actuator comprises a double-acting hydraulic cylinder which has a first cylinder port and a second cylinder port. The shift arrangement has a hydraulic circuit which has a pump and is connected to the first and second cylinder ports. The pump is connected to an electric motor as a pump drive and is embodied as a bidirectional rotational pump which has a first pump port which is directly connected to the first cylinder port, and which has a second pump port which is directly connected to the second cylinder port. The shift element can be moved by changing the rotational speed and/or the direction of rotation of the electric motor.

Abstract: A hydraulic system is provided for a hydraulic shifter assembly of a split shaft assembly having a power take off system and utilized on a vehicle that has an automatic transmission and limited access to the transmission—preventing a direct connection of a power take off to the transmission. The hydraulic system provides hydraulic pressure from the transmission to the hydraulic shifter assembly and back to the transmission from the hydraulic shifter assembly. The system also provides hydraulic pressure from the transmission to the power take off.

Abstract: In an automotive servo-assisted mechanical transmission, an electro-hydraulic actuation group has an actuation unit, a power unit able to provide hydraulic pressure to the actuation unit and an electronic control unit, the actuation and power units being equipped with respective components that are all mounted on a hydraulic casing of the actuation unit so as to define with one another a single assembly, at least part of the components being equipped with respective electrical connectors that are arranged in a manner such that they can all be engaged by a same multiple electrical connector device, electrically connectable to the electronic control unit.

Abstract: A bracket for transporting and assembling an actuation system of a servo-assisted mechanical gearbox, which actuation system presents a plurality of reciprocally connected assemblies; the bracket presents a first part adapted to support a first assembly of the actuation system and at least a second part, which is adapted to support a second assembly of the actuation system and is movable with respect to the first part.

Abstract: A hydraulic system (1) for actuating at least one shifting element (2) of a transmission. The hydraulic system comprises a regulating valve device (3) that can be preset and has a regulating valve slide (8), and a shifting valve device (4) which can also be preset and has a shifting valve slide (6). The shifting valve device (4) interacts with the regulating valve device (3). The regulating valve slide (8) and the shifting valve slide (6) are coaxially aligned with one another and move in opposite longitudinal directions within a common boring (24) of a housing (25). Each of the slides has a control surface (5, 14) which faces toward one another and can be pressurized with a pressure signal (p_VS) via a common pressure chamber (26).

Abstract: A hydraulic system for actuating an interlocking shifting element of a transmission which comprises two piston chambers and a piston element that delimits the piston chambers. The piston element can be acted upon in one piston chamber by a pressure to open the shifting element and, in the other piston chamber, by another pressure to close the shifting element. Pressure can be delivered by a valve to two piston chamber and the valve can be actuated by an actuator by a pilot pressure. The valve and the electro-hydraulic actuator are designed and functionally connected to one another such that, in the event of a pressure drop, a total hydraulic force, acting to close the shifting element, is applied to the piston element and, if the current supply to the actuator fails, a total hydraulic force acting, in the opening direction of the shifting element, acts upon the piston element.

Abstract: In an hydraulic pressure supply apparatus for a transmission having an input shaft connected to a drive shaft of a prime mover mounted on a vehicle through a torque converter with a lockup clutch, it is configured to have a hydraulic pump drawing up and discharging operating oil; a regulator valve regulating discharged pressure to a line pressure; first and second switching valves supplying hydraulic pressure to the first and second clutches; a first hydraulic control valve supplying the regulated line pressure to the lockup clutch; a third switching valve connected to an output port of the first hydraulic control valve; and first and second electromagnetic valves connected to operating ports of the first, second and third switching valves and adapted to switch among the first, second and third switching valves upon being energized and deenergized.

Abstract: A mechanism for actuating a transmission having shifting elements. A self-holding valve device is movable into a first position, by a pilot pressure, against a force directed to a second position and held by a pressure holding signal in the first position. Transmission of a pressure signal, to a switching valve, is blocked by the self-holding valve device in the first position but, in the second position, is applied to the switching valve. When the driver sets the switching valve to a first shift position, the pressure signal can be applied to valve devices of at least two of the shifting elements that produce an actuating pressure and, in a second shift position of the switching valve, the onward transmission of the pressure signal, to the valve devices of the shifting elements that produce an actuating pressure, is blocked in the area of the switching valve.

Abstract: A hydraulic arrangement by which a plurality of shift rails of a transmission are actuated, including one double acting cylinder per shift rail by which the respective shift rail can be moved back and forth. A first hydraulic valve is connected upstream of the plurality of shift rails and has a first output and a second output, by which a first shift pressure and a second shift pressure for actuating the shift rails can be provided. A second hydraulic valve is connected between the first hydraulic valve and two of the shift rails, and by which it is selectively possible for the first output of the first hydraulic valve to be associated with one of the double acting cylinders of the two shift rails, and the second output of the first hydraulic valve to be associated with the other double acting cylinder of the two shift rails.

Abstract: The invention relates to a transmission actuator for actuating a manual transmission in an automated manner, comprising a lane selection actuating cylinder (1) for selecting a shift lane (8, 9, 10, 11) and a gear selection actuating cylinder (2) for engaging a gear (12, 13, 14, 15, 16, 17, 18) in a shift lane (8, 9, 10, 11). Starting therefrom, a transmission actuator for actuating a manual transmission in an automated manner is specified, wherein a plurality of defined positions can are reachable with little design effort. For this purpose, the lane selection actuating cylinder (1) or a component (6) that can be moved by the lane selection actuating cylinder (1) can be automatically fixed in at least one predetermined locking position (19) by means of a locking device (28, 29, 30).

Abstract: An electro-hydraulic control system for a multiple speed automatic motor vehicle transmission includes main and auxiliary hydraulic pumps, a line pressure regulator, a lubrication pressure regulator, a lubrication override control valve and a torque converter control valve which is controlled by a variable force solenoid (VFS). Driver commands are provided to the system through a manual logic or spool valve which functions in conjunction with a spool or logic default valve and a default solenoid. Five solenoid valves receive various flows of hydraulic fluid and supply them to hydraulic actuators that engage and disengage four friction clutches and a selectable one-way clutch.

Abstract: A double-clutch transmission having at least three and preferably four, hydraulic shift cylinders, and a control device to actuate the hydraulic shift cylinders. To improve the speed of operation when selecting a gear, the shift cylinders needed for gear shifting are actuated with the aid of at least three electromagnetically shiftable directional valves.

Abstract: A speed changing mechanism includes a pump (1) including a liquid suction channel (6), a liquid drainage channel (8) and working components (3, 4) moving relatively to each other forming working volumes. A relative movement of the working component leads to a periodic increase and decrease of the working volume, so that the fluid is sucked through the liquid suction channel and discharged through the liquid drainage channel, and the pressure energy discharging the fluid is increased by the excursion of the working components. A part of working components is connected to an input component, another part of working components are connected to an output component. The movement of the part of working components relative to another part of working components is changed by changing the flow rate of the pump. Therefore, the speed changing mechanism can realize the switch-on/off of power transmission and change the transmitted power.

Abstract: A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid, a manual valve, and a default valve. A first set of solenoids are configured to selectively engage at least one of a plurality of shift actuators. The first set of solenoids is open when de-energized. A second set of solenoids is configured to selectively engage at least one of the plurality of actuators. The second set of solenoids is closed when de-energized. A low speed default gear is engaged when the first and second sets of solenoids are de-energized and the transmission is operating in a low speed gear ratio. A high speed default gear ratio is engaged when the first and second sets of solenoids are de-energized and the transmission is operating in a high speed gear ratio.

Abstract: A method is proposed for blocking inadmissible gearshift processes in a transmission with a plurality of shifting devices which, to carry out a shift process, are moved by actuating devices when a shift command is sent by a control unit (TCU) to the relevant actuating device. The actuating devices are connected for data exchange with one another and with the control unit (TCU) in such manner that the actuating device of the shifting device to be shifted is activated provided that clearance has been given by at least one other actuating device.

Abstract: 1. Device for the pulsed release of an amount of fluid (3) which can be stored in an accumulator housing (2). 2. A device for the pulsed release of an amount of fluid which can be stored in a storage housing (2) is characterized in that a locking device (7) is formed by a piston-cylinder arrangement (8) having a cylinder housing (9) that is subdivided into a first working chamber (11) and a second working chamber (12) by a working piston (10), an electrorheological or magnetorheological valve (14) in the form of a gap (15) or an opening being arranged between the working chambers (11, 12) in the circumference (13) of the working piston (10) or in the working piston (10) as such.

Abstract: A hydraulic control system for a dual clutch transmission includes a plurality of solenoids and valves in fluid communication with a plurality of clutch actuators and with a plurality of synchronizer actuators. The clutch actuators are operable to actuate a plurality of torque transmitting devices and the synchronizer actuators are operable to actuate a plurality of synchronizer assemblies. Selective activation of combinations of the solenoids allows for a pressurized fluid to activate at least one of the clutch actuators and synchronizer actuators in order to shift the transmission into a desired gear ratio.

Abstract: An actuator assembly includes a housing, a piston disposed within a portion of the housing. The piston has a movable range along a working-axis, and separates a first volume and a second volume within the housing. The assembly also includes a biasing feature disposed within the second volume, where the piston is configured to engage the biasing feature within a first portion of the movable range, and configured to not engage the biasing feature within a second portion of the movable range.

Abstract: The present invention provides a dial knob pivotably mounted and a hydraulic device for operating an inhibitor switch of an automatic transmission by creating hydraulic pressure using rotational motion of the dial knob, in order to provide a shift operating device for an automatic transmission that makes it possible to reduce manufacturing cost by having a simple structure and facilitate setting a layout by reducing a space for motion of shift knob, and makes it easy for a driver to shift by turning the shift knob with a hand to reduce the driver's tiredness and improve commercial value.

Abstract: A vehicle includes a transmission having at least one controllable actuator provided for engaging and/or disengaging at least one transmission gear, and a selection element to be operated manually, by which the actuator can be controlled, wherein. In order to engage a transmission gear, the selection element must first be moved in the direction of a specified end position assigned to the corresponding transmission gear. The selection element can be moved into the end position assigned to the corresponding transmission gear only when the corresponding transmission gear is actually engaged.

Abstract: A wet dual clutch transmission includes at least one hydraulic component and a pilot valve operably connected to the hydraulic component to actuate the hydraulic component. The pilot valve includes a Micro-Electro-Mechanical Systems (MEMS) based pressure differential actuator valve. The hydraulic component may include but is not limited to a first clutch and a second clutch of the wet dual clutch transmission, a lube regulator valve, an on/off solenoid, a synchronizing shift fork or a line pressure control valve.

Abstract: A system for controlling a transfer of torque from an engine to a manual transmission having a plurality of shiftable gears includes a selectively releasable and re-engageable clutch. The clutch is arranged inside the transmission and configured to transmit torque of the engine to the transmission when the clutch is in an engaged state. The system also includes a lever operatively connected to the transmission and movable to shift the gears. Additionally, the system includes an input device arranged on the lever and operable to selectively release and re-engage the clutch. A vehicle employing such a system is also provided.

Abstract: A servo valve for shifting a transmission between a park and out of park position includes a valve housing and a park servo. A first and second solenoid is disposed in the valve housing for transmitting a respective first or second signal to shift the transmission to the respective first or second state of operation. The park servo is fluidly connected to the transmission and is responsive to the first and second signals to shift the transmission to the respective positions. Fluid pressure within the valve housing moves a valve member therein to move a piston within the park servo to shift the transmission to the corresponding position. A third solenoid transmits a third signal in combination with the second signal to latch and hold the valve member in the corresponding position.

Abstract: A method for controlling a transmission includes using signals of first solenoids to control first and second clutches, servos of first gears and servos of second gears, using signals of a second solenoid to establish a flow rate to cool the clutches and to actuate the servo that is associated with a selected gear, and using signals of a third solenoid to direct the flow rate to one of the clutches and to engage the selected gear.

Abstract: A manual valve control for a multi-speed vehicle transmission is provided. Electronic and hydraulic components are provided, including trim valve systems that are multiplexed by a shift valve and a manual valve. The trim valves and shift valve are self-diagnosing via a plurality of multiplexed pressure switches. The control enables single and double range shifts among the multiple forward speed ratios, including shifts to and from sixth and higher forward ratios, reverse and neutral. The control also includes a reduced engine load at stop feature. In addition, a power off/limp home feature provides a plurality of failure modes, including a failure mode for sixth and higher forward speed ratios.

Abstract: A device for actuating a plurality of hydraulic control cylinders having a pressure regulating valve with a first and a second pressure regulating output, a first selector valve connected downline from the pressure regulating outputs, a second selector valve connected downline from the first selector valve, having a plurality of individual pressure outputs, where the second pressure regulating output is optionally assignable through the first and second selector valves to one of the individual pressure outputs, and the particular individual pressure outputs that are not assigned to the second pressure regulating output are assignable to the first pressure regulating output.

Abstract: A transmission device (1) including at least one shift element (3, 4) that can be actuated via an actuator (6) having at least one electrical component (5). The electrical component (5) is connected to a transmission shaft (7), rotates during operation at the rotational speed of the transmission shaft (7), and is operatively connected to further components of the transmission device (1), via an electrical transmitting device (8). Electrical energy can be exchanged, at the least, inductively via the transmitting device (8) between the components of the transmission device (1) and the at least one electrical component (5) connected to the transmission shaft (7). Hydraulic actuating pressure can be generated, via the electrical component (5), for actuating the shift element (3, 4).