Shift Control Method For An Automatic Gearbox
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Accused Products
Abstract
A shift control method of a range group transmission with a multi-speed main transmission, which connects with a drive motor, via a clutch (K) and an input shaft. A transmission brake optionally engages the input shaft. At least a two range group is located downstream of the main transmission. A range change shift is accomplished by changing a gear of the main transmission and the range group. The shifting sequence is accelerated by: reducing motor torque and disengaging the clutch (K); disengaging a previous range group gear; synchronizing a new range group gear; disengaging a previous main transmission gear; engaging the new range group gear; synchronizing a new main transmission gear; engaging the new main transmission gear; and engaging the clutch (K) and increasing the motor torque, such that synchronization of the new gear occurs by influencing the input shaft of the main transmission.
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Citations
19 Claims
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1-9. -9. (canceled)
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10. A shift control method of an automatic transmission, the automatic transmission (1) including at least a two stage range group (BNG) and a multistage main transmission (HG), the automatic transmission (1) having an input shaft (W1) connectable, via a controllable start up and shifting clutch (K), with a drive motor (M) and being braked by a transmission brake (B), the at least two stage range group (BNG) being located downstream of the main transmission (HG) such that a range change shift is rapidly accomplished by a gear change in the main transmission (HG) and a gear change in the at least two stage range group (BNG) by synchronization of a subsequent gear in each of the main transmission and the at least two stage range group by an outside force-controlled action on the input shaft (W1) of the main transmission (HG), the method comprising the steps of:
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reducing a motor torque and disengaging the start up and shifting clutch (K); disengaging an engaged gear of the at least two stage range group (BNG); synchronizing the subsequent gear of the at least two stage range group (BNG); disengaging an engaged gear of the main transmission (HG); engaging the subsequent gear of the at least two stage range group (BNG); synchronizing the subsequent gear of the main transmission (HG); engaging the subsequent gear of the main transmission (HG); and engaging the start up and shifting clutch (K) and increasing the motor torque. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of controlling range change shifting of an automatic transmission having a multistage main transmission (HG) and an at least two gear range group (BNG), the automatic transmission includes an input shaft (W1) connected to a transmission brake (B) and, via a first clutch (K), to a drive motor, the range group (BNG) being located, in a flow of power direction, downstream of the main transmission (HG), the method comprising the steps of:
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reducing torque from the drive motor and disengaging the start up and shifting clutch (K); disengaging an engaged gear of the range group (BNG); synchronizing a subsequent gear of the range group (BNG), by one of reducing rotation of the input shaft (W1) by at least partial engagement of the transmission brake (B) and accelerating the input shaft (W1) with the drive motor (M) by at least partial engagement of the start up and shifting clutch (K); disengaging the engaged gear of the main transmission (HG); engaging the subsequent gear of the range group (BNG); disengaging one of the transmission brake (B) and the start up and shifting clutch (K); synchronizing the subsequent gear of the main transmission (HG), by at least partially engaging one of the start up and shifting clutch (K) and the transmission brake (B); engaging the subsequent gear of the main transmission (HG); disengaging the transmission brake (B), if at least partially engaged; and engaging the start up and shifting clutch (K) and increasing the motor torque from the drive motor.
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Specification