摘要:
A hydraulic control system for a hydrodynamic/mechanical transmission with hydraulically actuated clutches for selecting the "gears" or "speeds" of the mechanical transmission comprises a hydraulic-pressure source, e.g. a pump connected with the crank shaft of an engine, delivering hydraulic fluid to the clutches via a main pressure line. The pressure in this line is controlled by a main pressure valve such that the excess fluid is supplied to the feed line of the hydrodynamic unit of the hydrodynamic/mechanical transmission, e.g. a torque converter or fluid coupling. At higher fluid excesses in the main pressure line, the hydraulic fluid is bypassed to the intake side of the source between a filter and the pump. The system includes a further pressure valve which constitutes the pressure control valve for the hydrodynamic unit, the latter valve having only two controlled ports and being free from any port connected to the reservoir. The pressure-regulating valve of the hydrodynamic unit acts against a spring and receives the pressure at the intake side of the hydrodynamic unit which is effective against the force of the spring and tends to bias the valve member or spool of this pressure control valve into its closed position.
摘要:
A vehicular parallel hybrid drivetrain contains a combustion engine, electric motor and drive output and a method of operating the drivetrain. A respective shift element device (6, 7) with continuously variable transmission capacity is provided, between the combustion engine and the electric motor and between the electric motor and the drive. The shift element device (6), between the combustion engine and electric motor, comprises a speed-dependent hydraulic coupling element and a frictional shift element in a parallel power branch. The shift element device (6) has continuously adjustable transmission capacity and is bridged, via the hydraulic coupling element. The hydraulic coupling element actively couples with the electric motor, via a free-wheel overrunning connection (8). This coupling disengages when the speed of the coupling element side of the coupling element is lower than the speed of the electric motor in the area of the free-wheel overrunning connection.
摘要:
The hydraulic control device for accommodating electromagnetic actuators and hydraulic valves, which is inserted in an automatic transmission for a motor vehicle, has at least one seal which is made of an aluminum support which has a thickness in the range of from 1 to 2 mm and is coated with a material at least on one side; the material, having a layer thickness in the range of from 100 to 180 &mgr;m, has a hardness in the range of from 20 to 120 Shore A and on its free surface is provided with a profiling having a depth in the range of from 20 to 50 &mgr;m.
摘要:
Device for releasing in case of emergency a security device for a motor vehicle having an automatic transmission (1) in which the parking lock of the automatic transmission (1) is released by actuating a towing device (2) accessible from outside the motor vehicle and the axial movement associated therewith of the operative connection (3) between the towing device (2) and the release device (10) on the automatic transmission (1). By a stop (12) of the towing device (2) the release device (10) remains activated until the stop (12) on the towing device is deactivated.
摘要:
In a control mechanism for a frictionally engaged lock-up clutch of a hydrodynamic torque converter, a coupling element (8) is axially displaced for engaging and disengaging the lock-up clutch (7), face end actuation spaces (10, 11) being accordingly pressurized via regulating valves (15, 16). A lubricant line (28) leads via a radiator (39) to lubrication points (40) of a change-speed gear (6) rear-mounted on the torque converter (3), the lubricant line (28) being attached to a controlled return flow of the actuation space (11). To ensure there is a sufficient supply of lubricant to the lubrication points (40) and a sufficient cooling of the pressurized fluid or lubricant in all shift conditions of the lock-up clutch (7) via the radiator (39), a leg (34) of the main pressure line (13) is attached to the lubricant line (28) before the radiator (39) which feeds a missing amount of lubricant into the lubricant line (28).
摘要:
Electric-hydraulic control for an automatic transmission (1) with a selecting slide (4), at least for the neutral position (N), as well as the forward drive position (D) and the reverse drive position (R), an electronic control device (5), which is connected to at least one sensor (55) for detecting the gear output speed, with solenoid valves (6, 65) held in neutral position by spring force, a pressure-medium source (7), pressure-control valves (8) and switch valves (9) and dampers for the actuation of gear-selecting clutches and -brakes (A-E) as well as with a R-gear safety mechanism which is created by the cooperation of a solenoid valve (6) and a switch valve (9), both of them being already used in other gear-selecting operations. The solenoid valve (6) is either immediately switched by moving the selecting slide (4) into the R-gear when the speed of the forward motion reaches or falls below a definite value, or the switching is interrupted until the speed of forward motion reaches or falls below the definite value. The electronic control device ( 5) switches off the solenoid valve (6), whereby the R-gear coupling B and -brake (D) are activated by the operational pressure via the switching valve (9).
摘要:
A vehicle driven by a super charged engine has a gear transmission that is automatically shifted between drive ratios under the joint control of vehicle speed and engine load demand, modified by a loading signal pressure derived from the engine carburetor to correctively influence the change in drive ratio so as to accommodate a super charged type of engine. Such loading signal pressure is applied to a shift valve of the transmission control system independently of control pressure reflecting vehicle speed and engine load demand in order to correctively modify the pressure control exercised during the drive ratio change interval.
摘要:
A device to allow for emergency operation of an automatic-transmission motor vehicle, having a monitoring device to monitor pre-determined operating parameters, a diagnostic device to detect faults, a control device to activate an alternative function, and an output device by means of which the fault may be presented to the driver. The control device provides the driver an emergency operation capability while providing an alternative function depending on the degree of the fault.
摘要:
The invention relates to a parking brake system for transmissions of motor vehicle, especially for an automatic transmission and an automated selector transmission, having one parking brake for blocking or releasing the transmission according to actuation signals of a control device, especially by a pawl engaging and disengaging in a parking brake gear connected with the output of the transmission, an electric operative connection between the control device in the interior of the motor vehicle and the parking brake, a spring accumulator (9) for actuating the parking brake and a pressure-controlled release device of the parking brake. It is proposed to load the release device (10) when releasing the parking brake with a negative pressure independent of the transmission and which is preferably taken from the suction system (15) of the internal combustion engine of the motor vehicle or from a negative pressure brake force booster of the motor vehicle.
摘要:
Parking brake, notably for automatic transmissions of motor vehicles, which is released via hydraulic pressure acting on a spring accumulator (3) and which is additionally held in the released state by a locking system (13) is actuated by a magnet (5) through which a current flows. The locking system (13) is kept activated and thus the parking brake released until the magnet (5) in the position in which the locking system (13) is actuated, has a power consumption lower than necessary for loading the locking system (13).