DEVICE FOR REDUCING THE DROP IN TRACTIVE FORCE
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Accused Products
Abstract
A device for reducing the drop in tractive force during the gear shifting phase of an automatic transmission (1) comprising an automatically actuated drive clutch is proposed that comprises a rotary storage device (8) that, if necessary, can be coupled in a friction lock by means of two transmission ratio steps (4, 5) that are each assigned a friction clutch (6, 7) to the output shaft (3) of the transmission (1) or, if the transmission has a downstream range group, to the output shaft of the main friction transmission as needed, wherein one of the two friction clutches (6, 7) can be activated at any time, and wherein a step up ratio can be achieved and the rotary storage device can be loaded with one of the transmission ratio steps (5), whereas a step down ratio can be achieved and energy can be released from the rotary storage device (8) to the output shaft (3) using the other transmission ratio step (4).
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Citations
14 Claims
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1-7. -7. (canceled)
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8. A device for reducing a drop in tractive force during a gear shifting phase of an automatic transmission (1) with an automatically actuated drive clutch, the device comprising:
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a rotary storage device (8) being connectable with a friction lock by two transmission ratio steps (4, 5) that are each assigned a friction clutch (6, 7) to either an output shaft (3) of the transmission (1) or, if the transmission has a downstream range group, to the output shaft of a main friction transmission, and only one of the two friction clutches (6, 7) being activated at any time, and a step up ratio being achieved, and the rotary storage device being loaded with one of the transmission ratio steps (5) in situations outside of the gear shifting phase, and a step down ratio being achieved and energy being released from the rotary storage device (8) to the output shaft (3) with the other transmission ratio step (4) during a gear shifting phase. - View Dependent Claims (9, 10)
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11. A method of operating a device for reducing a drop in tractive force during a gear shifting phase of an automatic transmission (1) having an automatically actuated drive clutch, the device comprising a rotary storage device (8) being connectable with a friction lock by two transmission ratio steps (4, 5) that are each assigned a friction clutch (6, 7) to one of an output shaft (3) of the transmission (1) or, if the transmission has a downstream range group, to an output shaft of a main friction transmission, only one of the two friction clutches (6, 7) being activated at any time, and a step up ratio being achieved and the rotary storage device being loaded with one of the transmission ratio steps (5) in situations outside of the gear shifting phase, a step down ratio being achieved and energy being released from the rotary storage device (8) to the output shaft (3) with the other transmission ratio step (4) during a gear shifting phase, the method comprising the steps of:
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loading the rotary storage device (8) in situations outside of the gear shifting phase by engaging the friction clutch (7) assigned to the step up ratio (5), such that a speed level of the rotary mass of the rotary storage device (8) is elevated by a predetermined factor corresponding to the achievable ratio above a level of rotational speed of the output shaft; deactivating the step up ratio (5) between either the output shaft or the output shaft (3) of the main transmission and the rotary storage device (8), during a gear shifting phase, if the clutch (7) assigned to the transmission ratio step (5) is engaged by disengaging the clutch (7) assigned to this transmission ratio step (5); and engaging the clutch (6) assigned to the step down ratio (4) to overlap with the torque of the drive clutch such that energy of the rotary storage device (8) is transferred to one of the output shaft (3) or the output shaft of the main transmission to one of prevent and reduce the drop in tractive force during the gear shifting phase. - View Dependent Claims (12, 13, 14)
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Specification