摘要:
A device for controlling a hydraulically operable switching element (2) of an automatic transmission of a vehicle with a position valve mechanism (3) having a main switch piston (6) which is spring biased into a first switch position and a second switch position with a pilot pressure (P_MV) which is adjustable through an electrically operated actuator (5). An additional switch piston (7) and the main switch piston (6) are axially actuated in a valve housing (8). Depending on the position of the pistons (6, 7), faces (6A, 7A) of the respective pistons are either spaced apart or adjacent. The additional switch piston (7) is adjustable depending on a pilot pressure (p_K) of a switching element which engages a gear for forward drive.
摘要:
A control valve arrangement for controlling a start coupling of an automatic gearbox comprising a clutch control valve (3, 37, 41, 48, 49) for controlling at least one clutch actuating device (4, 40) which, during normal operation of the gearbox, converts a supply pressure input (P_V1, P_V2) into a clutch actuation pressure (P_K, P_K1, P_K2) according to a pre-control pressure or an electric pre-control signal in order to control the clutch actuation device. An activating pressure (P_A) can be supplied to the clutch control valve or directly to the clutch activation device in the event of a discontinuation of the pre-control pressure or pre-control signal according to the engine and gearbox output speed, whereupon the clutch actuation device is maintained in a closed position as long as the above mentioned speed remains above a predetermined limit.
摘要:
An apparatus operating a hydrodynamic torque converter and a corresponding converter-bypass clutch of a transmission. The apparatus having a line system, a solenoid valve and a therewith coacting variable pressure controlling valve. A valve stem assembly respectively of the solenoid valve and the pressure control valve are controllable by subjection to a pilot pressure counter to a spring arrangement. A spent flow of the torque converter is, by way of a piston chamber of the converter-bypass clutch, which chamber is subjected to hydraulic fluid pressure of the spent flow of the torque converter, by means of an operational pressure aperture valve and a relief control aperture valve of the pressure control valve, connectable to a spent flow control aperture valve of the solenoid valve. By way of the piston chamber, this spent flow communicates with the hydraulic system through the spent flow control aperture valve of the solenoid valve.
摘要:
A method for operating power train side components of a motor vehicle. Using a control device of a motor, at least one motor parameter is issued and delivered via a databus to at least one control device of one other power drive side component working independently of the motor control device in order to operate all or each one of the power drive side components dependent in a first inventive aspect, a behavior of the respective other power drive side components that adjusts itself according to the motor torque actually made available by the motor is evaluated. In second inventive aspect, the motor torque issued by the motor control device is compared with a torque stored according to motor operation parameters in the control device working independently of the motor control device.
摘要:
A device for the control of a hydraulically actuated clutch (1) of an automatic transmission of a motor vehicle having a slide-valve mechanism (3) is proposed, in which a valve piston (4) can move between a first working space (7) which can be pressurized via a control line (8) with a control pressure (p_MV) adjustable by means of an electrically operated actuator (9) and a restoring space (10) containing a restoring spring (11) that acts on the valve piston (4). The valve piston (4) is made with several piston sections (4A, 4B) that delimit a pressure space (12) which is connected via a line (13) to a clutch space (2) of the clutch (1) and which, depending on the position of the valve piston (4), has a connection to a pressure supply line (14) delivering a system pressure (p_sys) or to a pressure-relief line (15). As an emergency operation device when the actuator (9) is switched off, it is provided that during a transition to an emergency operating mode associated with the current operating mode, the pressure in the first working space (7) is maintained by means of a second piston (16), which is in communication via a second working space (18) with the clutch space (2) of the clutch (1) or that of a clutch connected in parallel therewith.
摘要:
Electronic-hydraulic control device of an automatic automobile transmission in which all of the solenoid valves (12) and pressure control valves (6, 7, 8, 9, 10, 11) are de-energized when the electronic control device fails and in which a lower gear, preferably third gear, is automatically selected when a lower gear has been previously engaged, and a higher gear, preferably fifth gear, is selected when a higher gear has been engaged previously. The control valves (20, 21, 23) have surfaces of different dimensions that can be controlled jointly or individually to permit a variety of valve characteristic curves.
摘要:
An actuating device for a shift element of a transmission which is acted upon by a hydraulic actuating pressure (p_B1) and comprises a valve device. To vary the actuating pressure (p_B1), the valve device is acted upon by a control pressure (p_EDS) in an area of active surfaces (A18, A19) of at least a first and a second valve slides. An active surface (A38) of the first valve slide (A8) is acted upon by a hydraulic pressure (p_B2) which is equivalent to the actuating pressure (p_B1), acts in opposition to the control pressure (p_EDS) and can be adjusted as a function of the control pressure (p_EDS) applied, such that a smaller variation of the actuating pressure (p_B1) results from a change of the control pressure (p_EDS) within a first pressure range of the control pressure (p_EDS) than within a second pressure range of the control pressure (p_EDS).
摘要:
A hydraulic transmission unit comprises at least one pressure regulation valve (1) and a pilot control valve (2) which is connected to the pressure regulation valve (1) by a pilot control line (35). A pre-filling valve (3, 303) sets a pre-filling pressure (p—3) to avoid draining of a clutch (20) and the lines (231, 331) connected to the clutch (20) in an operating condition in which the clutch (20) is not actuated. To avoid draining when the clutch when in the operating condition, the pilot control line (35) is also connected to at least one line (236, 238, 336, 338) which is pressurized with a second pre-filling pressure (p—3).
摘要:
An electrohydraulic control device (1) of an 8-speed transmission having several electrically controllable pressure control valves (6-12) for hydraulically actuating five switching elements (A-E) and an electric gear control unit via which different operating states of the transmission may be adjusted. Three of the switching elements are connected in the force flow of the transmission for representing a gear ratio (“1” to “R”) of the transmission. When the gear control unit is de-activated and the power supply to the solenoid valve and pressure control valves is interrupted, and when the transmission is in the operating state, in which a gear ratio (“1”; “2”; “3”; “4”; “5”; “6”; “7”; “8”; “R”) is engaged, a predefined emergency transmission (“6”; “R”) is represented by three simultaneously hydraulically connected switching elements (C, D, E, A, B, D).
摘要:
An electrohydraulic transmission controller (7), a transmission device with an electrohydraulic transmission controller and a vehicle drive train that features an electrohydraulic transmission controller are disclosed. The electrohydraulic transmission controller is constructed with a plurality of electrically actuatable pressure control valves (9 to 16), as well as with a plurality of valve arrangements (17 to 34) that can be acted on in each case by an hydraulic precontrol pressure depending upon the actuation of the pressure valves, by way of which valve arrangements switching elements (A to E) of a transmission device can be acted on in each case with a control pressure to produce a required operating state of the transmission device. An additional pressure control valve (9) is provided to adjust a precontrol pressure (p_VS—9) of an additional valve arrangement (35), whereby downstream of the additional valve arrangement, the sub-assembly (6) of a vehicle drive train can be acted on by a cooling oil volume flow subject to the precontrol pressure of the additional valve arrangement and an operating state of the additional valve arrangement (35) corresponding to it.