摘要:
A method of performing a shift operation in an automatic transmission with at least one form-locking shifting transmission part of a vehicle, with which, during a shift to a target gear (GZIEL), a rotational speed synchronization, between the transmission input rotational speed and the output side rotational speed, is performed. When a different rotational direction is detected between the transmission input and the transmission output, the rotational speed of the transmission input is reduced to a minimum and the target gear (GZIEL) is only shifted when the remaining rotational speed difference, between the rotational speed of the transmission input and the rotational speed of the transmission output can be at least substantially synchronized by the form-locking shift element.
摘要:
A method of operating a drivetrain of a vehicle comprising an engine, a clutch and a transmission comprising a claw-shifted main transmission and a synchronized upstream and/or downstream group, such that shifting from a current gear to a target gear is accomplished by actuating one of the synchronized upstream or downstream group and without actuating the engaged clutch and the claw-shifted main transmission. The method includes reducing engine torque and, when the engine torque is less than or equal to a limit value, the synchronized upstream or downstream group is actuated to disengage the currant gear. Then, when the engine torque is approximately zero, the synchronized downstream or upstream group is disengaged and held in neutral, and the speed of the engine is then adjusted to a target speed. The synchronized upstream or downstream group is actuated to engage the target gear and upon engagement the engine torque is increased.
摘要:
A method and device for actuating a shifting arrangement with electric actuators of a transmission control of a motor vehicle. The method includes determining a total current of the shifting arrangement available at a point in time, detecting shift requests of shift elements and compared these with the total available current. Shift requests are then tested according to preset priorities and the sequentially performed according to the priority test. The method avoids exceeding a preset allowed current load, when the requested shifts would exceed the total available current. If the total available current would not be exceeded by the requested shifts, the requests are carried out. A device is also provided in the shifting arrangement which has control and detection mechanisms that monitor current and control the current flow.
摘要:
A control device for and a method of controlling a gearbox having a pressure-limiting device connected to a pressure medium source. A first controllable valve device is connected downstream of the pressure-limiting device and an actuating device is connected further downstream and adjusts the gearbox. A second controllable valve device is connected directly to the pressure medium source, via a supply line, and another actuating device is connected downstream of the second controllable valve device. An electric control device is provided for actuating the controllable valve devices and a sensor is connected to the electric control device for measuring pressure of the pressure medium in the supply line. The electric control device is connected to the second controllable valve device such that the second controllable valve device and the further actuating device are controlled by the pressure of the pressure medium in the supply line.
摘要:
A method of operating a hydraulic or a pneumatic control device of a semi-automatic transmission. The control device has actuator devices with actuating cylinders. Pressure chambers of the actuating cylinders can each be connected, via a control valve, with a pressure line that can be selectively connected with a main pressure line, or blocked, via redundant and parallel positioned main switching valves. The control device has at least one sensor and at least one measured signal is captured by the at least one sensor, depending on the actuation of the main switching valves. The at least one measured signal or each captured measured signal is compared to a stored nominal signal for the respective actuation of the main switching valves and, if a deviation is determined between the measured signal and the respective nominal signal, a defect of at least one of the main switching valves is concluded.
摘要:
A method for controlling or regulating a clutch torque of a startup clutch of a motor vehicle, which first of all reliably prevents an unintentional rolling of the motor vehicle down a gradient and second enables a comfortable maneuvering mode, which requires no separate actuation of an operating element for activating a maneuvering mode, and also enables a precisely dosed speed definition during maneuvering on gradients, wherein the adjusted speed is substantially independent from the gradient of the ground and the motor vehicle load. A startup and maneuvering control device is provided according to the invention, which reads in driving resistance data, determines therefrom a driving resistance value, and determines a base value of the clutch torque of the automated startup clutch in dependence thereof, which is adjusted in dependence upon the accelerator pedal.
摘要:
A method of operating a drivetrain of a motor vehicle. The drivetrain comprises a transmission arranged between a drive assembly and an axle drive, such that an input shaft of the transmission is connected, via a controllable separator clutch, to the drive assembly and an output shaft of the transmission is connected to the axle drive, and such that the transmission comprises at least one shifting element formed as a claw clutch. To reduce the probability that a tooth-on-tooth position may occur in a shifting element formed as a claw clutch, a torque is applied thereto by at least one transmission-internal assembly and/or at least one transmission-external assembly so that a speed difference at the claw clutch approaches a predetermined nominal value, and engagement of the claw clutch is only started when the speed difference of the claw clutch reaches the nominal value.
摘要:
A method for controlling an automated vehicle transmission during the process of starting such that a gear is selected, depending on predetermined criteria, and engaged by a transmission control device. For maintaining the availability of the vehicle, so far as possible, even if there is a failure in the gearshift system, the method provides that if a gear preselected by the driver or by a starting strategy system should fail, a substitute gear is engaged automatically. To give the driver enough time to react appropriately to the unexpected starting situation, a delayed starting sequence (substitute starting mode), which is implemented by an electronic vehicle control system, is independent of the dynamics of accelerator pedal actuation.
摘要:
A method and a device for controlling a fluid-actuated control system of an automatic or automated transmission of a motor vehicle, which has at least one pressure medium source, at least two control elements that are actuated by pressurized fluid and a control device for controlling the fluid-actuated control system. A further control module is used to reduce; the number and power consumption of valves that are actuated simultaneously to control the control elements; and the mechanical loading of the control elements (1, 2). The control module reads signals concerning at least one current control action and, in accordance with predetermined patterns, calculation rules and/or models, generates signals that cause non-switched control elements to be manipulated by pressurized working fluid.
摘要:
A method for the control of an automatic transmission during a change of ratio procedure, wherein the synchronous speed of rotation (SD) for the new transmission gear-stage lies under the no-load speed of rotation (LD) of a drive motor which can be connected to the transmission and wherein a gear-stage engagement actuator for the engagement of a new transmission gear-stage is then activated, when the transmission input speed of rotation (GED) has reached a predetermined speed of rotation window (F), which window also encompasses the synchronous speed of rotation (SD). In order to make such a shifting method more comfortable than previously, the invented method deviates from that procedure based on downshifting, which has been customary up to this time and rather proceeds in a upshifting mode.