摘要:
A method for operating a multi-step automatic transmission arranged in a drive train of a vehicle with a combustion engine. When downshifting from the third gear ratio to a second gear ratio, higher inertia must be shifted than when shifting from the third gear ratio to the first gear ratio. Upon a demand for a coasting downshift from the third gear ratio to the second gear ratio or to the first gear ratio with no performance demand on the combustion engine, the coasting downshift to the second gear ratio is not executed and the first gear ratio is engaged when the requirements for downshifting to the first gear ratio are met.
摘要:
The device for shifting an automatic transmission for motor vehicles has a selector lever, which makes possible an automatic uplifting and downshifting of the transmission in a first position as well as an additional arrangement on the steering wheel for manual downshifting or upshifting; this additional arrangement 2 is integrated within the steering wheel rim 1.
摘要:
A method for operating a drive train of a vehicle with a hydrodynamic torque converter, one transmission device and one prime mover during a gearshift starting from an actual ratio to a target ratio. A nominal standard of the control pressure of the shifting element to be disengaged is adjusted according to a nominal standard of the control pressure of the shifting element to be engaged. The rotational speed of a turbine of the torque converter is passed during the gearshift, starting from a synchronous rotational speed of the turbine of the actual ratio, in direction of a synchronous rotational speed of the turbine of the target ratio, the nominal standard of the control pressure of the shifting element to be disengaged.
摘要:
Proposed is a method for the control of an automatic transmission of a motor vehicle driven by an internal combustion engine with an exhaust gas catalyst. For the purpose a more rapid warm-up of the catalyst, a warm-up shift program (E4) is input into an electronic transmission module, with characteristic curves for a gear change at higher motor speeds of rotation (nmot) than have been input for the operating temperature of the catalyst, which method is initiated when, via a temperature sensor, a call for a warm-up phase of the internal combustion is signaled. The warm-up shift-program (F4) remains activated until a value (WLPR), which is equivalent to the quantity of exhaust gas flowing through the catalyst, reaches that value predetermined as the threshold value (WLPRE).
摘要:
Described is a method for operating a multi-step automatic transmission, particularly an automatic transmission of a drive train of a vehicle with a combustion engine. In downshifting from the third gear ratio to a second gear ratio, higher inertias must be shifted than when shifting from the third gear ratio to the first gear ratio. According to the invention, when there is a demand for a coasting downshift from the third gear ratio to the second gear ratio or to the first gear ratio with no performance demand on the combustion engine, the coasting downshift to the second gear ratio is not executed, and the first gear ratio is engaged when the requirements for downshifting to the first gear ratio are met.
摘要:
A shifting device for an automatic transmission controlled by an electronic control device (2) for vehicles, especially for motor vehicles, is described, which has a first shifting device (4), in which different gears to be shifted automatically can be preselected by manual selection, and a second shifting device (9), which can be actuated by device of a selector device (5) and in which the selector device (5) is held in the neutral middle position, from which it can be moved by manual actuation in a first direction (15) for inducing upshiftings and in a second direction (16) for inducing downshiftings, wherein the shifting movements of the selector device (5) are detected by device of sensors and are sent as signals to the control device (2). The second selector device (5) has a shift position (−) for the selector device (5) for single downshifting into the next lower gear and another shift position (−−) for maximum downshifting into the gear with the lowest possible ratio and/or a shift position (+) for the selector device (5) for single upshifting into the next higher gear and another shift position (++) for maximum upshifting into the gear with the highest possible ratio.