摘要:
A transmission device (10) having at least one form-fitting shifting element (12) which is hydraulically actuated via a hydraulic system (11) with hydraulic pressure (p—12), in the area of a piston chamber, via a feed line (20) that conveys hydraulic fluid, to shift from a disengaged to and engaged operating state. A non-return valve device (27) is arranged upstream of the form-fit shifting element (12).
摘要:
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.
摘要:
A transmission oil pump for an automatic transmission of a motor vehicle. The speed of the oil pump can be shifted by a transmission (2), that is arranged between the drive motor of the motor vehicle and the transmission oil pump, to a fast-running mode or a slow-running mode so that the oil pump can be operated at two different speed levels.
摘要:
The invention describes a method for operating a transmission's valve system of a vehicle's drive train through a valve unit and said valve unit's electro-magnetic activator configuration. In a transmission's hydraulic system and being part of the vehicle's drive train, its hydraulic pressure value (p_EDS) can be employed and adjusted through a valve unit's configuration by applying to the electro-magnetic activator system a pulse-width-modulated current signal (i_EDS). The pulse-width modulated current signal (i_EDS) and its signal's amplitude (A) and/or its pulse duration (pw1) will periodically change during the applied Dither-Modulation, by maintaining at the same time the required pressure value (p_EDS), whereby a horizontally moving anchor, which is attached the valve system's valve shaft, receives hereby an imposed vibrating oscillation. As shown in this invention, the Dither-Modulation will be activated or deactivated accordingly during pre-defined operating conditions of the vehicle's drive train.
摘要:
A process of monitoring a drive direction of an automatic or automated vehicle transmission at near-zero vehicle speed via an engaged gear. A desired direction of drive of the transmission is determined from an engaged gear at the time the vehicle begins motion. An actual direction of drive is determined from the transmission and, if different from the desired direction of drive, an error signal is produced. The process includes determining the actual drive either from a sensed rotational direction of a transmission input shaft and a sensed rotational direction of a transmission output shaft or a sensed valve setting, a sensed pressure in an transmission electro-hydraulic control system or on a transmission shifting element or from a sensed direction of rotation of a transmission gearset element or from axial movement or force of a transmission constructional element.
摘要:
A transmission apparatus (10) having at least one form-lock shifting element (12) that can be actuated by a hydraulic system (11) which, in the region of a piston chamber, can be subjected to hydraulic pressure (p—12) via a hydraulic fluid-conducting feed line (20) and which can be actuated from a disengaged to an engaged operating state. The hydraulic fluid-conducting feed line (20) of the shifting element (12) is effectively connected to a damping device (22) by which pressure fluctuations, of the hydraulic pressure (p—12) in the feed line (20), can be at least partially compensated.
摘要:
An automatic vehicle transmission comprises a first oil supply unit (10) with at least one mechanically driven first pump (11) and a second oil supply unit (20) with at least one electrically driven second pump (21), and a valve device (14) and a clutch system (1). The second oil supply unit (20) supplies the clutch system (1), during a first operating condition, and the first oil supply unit (10) supplies the clutch system (1), during a second operating condition.
摘要:
A pressure (p—3) setting system (200) with a pressure control valve (1), comprising a valve gate (10) arranged to be displace in a valve bore (12). The valve bore has at least one pressure chamber (21, 22, 23, 24, 25, 26), in which the valve gate may be axially exposed to a pressure. A first pressure chamber (21) is connected to at least one acceleration-dependent compensation member (203) for full or partial compensation of any pressure (p—3) setting disturbances caused by mass forces (F_a1, F_a2) resulting from the acceleration (a) of the system.
摘要:
A method of determining a fill current value of a converter lock-up clutch of an automatic transmission. The automatic transmission comprises a hydrodynamic converter, at which a speed ratio arises, and an output shaft. In a control sequence with the output shaft being stationary, the speed ratio is influenced by changing the control current, and the fill current value is determined from the progression of the speed ratio arising, during the control sequence, in conjunction with the progression of the control current.
摘要:
A hydraulic system for actuating a transmission shifting element that comprises control and shifting valves. A first surface of a valve slide of the control valve is a differential surface between two functional surfaces of the slide that axially bound an area of the slide having a smaller diameter, by which the actuation pressure is adjusted. When the shifting valve is in a second switch position, a total force component acts upon the slide of the control valve which moves the slide such that the actuation pressure is equal to a system pressure. The total force component corresponds at least to the sum of a first force component equivalent to a pressure signal applied to a second surface of the slide of the control valve and a second force component equivalent to an actuation pressure applied to the first surface of the slide of the control valve.