Method for controlling the shifting of an automatic geared transmission
First Claim
1. A method of controlling shifts in an automated multi-step variable-speed transmission, in a drive-train of a motor vehicle, arranged between a drive engine and an axle drive, the method comprising the steps of:
- determining, while driving, current operating parameters of the motor vehicle, including vehicle, road and driver-specific operating parameters, and topographical data including a height profile of a road section ahead of the motor vehicle;
determining a driving resistance profile (FFW(xF)) of the motor vehicle for the road section ahead and from the current operating parameters operating parameters, and the topographical data including the height profile of the road section ahead;
determining from the driving resistance profile (FFW(xF)) for the road section ahead and from operating parameters of the drive engine and the multi-step variable-speed transmission, a limiting gear progression (GGr(xF)) which comprises a sequence of respective gears in which traction force of the drive engine acting on drive wheels of the motor vehicle is, in each case, larger than the driving resistance profile ((FFW(xF));
deriving control commands, during traction operation of the multi-step variable-speed transmission in the automatic mode, for at least one of traction upshifts and traction downshifts as a function of the limiting gear progression (Ggr(xF)); and
implementing the control commands, via a transmission control system, for the at least one of the traction upshifts and traction downshifts.
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Accused Products
Abstract
A method for controlling shifts in an automated multi-step variable-speed transmission, in a drive-train of a motor vehicle, between a drive engine in the form of an internal combustion engine and an axle drive. During driving, besides current vehicle, road and driver-specific operating parameters, topographical data relating to a road section ahead of the motor vehicle, in particular the road section height profile, are determined, and from this information, the driving resistance profile (FFW(xF)) of the motor vehicle for the road section ahead is determined. In the automatic mode of the multi-step variable-speed transmission, control commands for traction upshifts and/or traction downshifts are derived, during the traction operation, as a function of the driving resistance profile (FFW(xF)) and are implemented in the transmission. A limiting gear progression (GGr(xF)) is determined, which consists of the sequence of gears, and is evaluated for the derivation of control commands.
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Citations
20 Claims
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1. A method of controlling shifts in an automated multi-step variable-speed transmission, in a drive-train of a motor vehicle, arranged between a drive engine and an axle drive, the method comprising the steps of:
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determining, while driving, current operating parameters of the motor vehicle, including vehicle, road and driver-specific operating parameters, and topographical data including a height profile of a road section ahead of the motor vehicle; determining a driving resistance profile (FFW(xF)) of the motor vehicle for the road section ahead and from the current operating parameters operating parameters, and the topographical data including the height profile of the road section ahead; determining from the driving resistance profile (FFW(xF)) for the road section ahead and from operating parameters of the drive engine and the multi-step variable-speed transmission, a limiting gear progression (GGr(xF)) which comprises a sequence of respective gears in which traction force of the drive engine acting on drive wheels of the motor vehicle is, in each case, larger than the driving resistance profile ((FFW(xF)); deriving control commands, during traction operation of the multi-step variable-speed transmission in the automatic mode, for at least one of traction upshifts and traction downshifts as a function of the limiting gear progression (Ggr(xF)); and implementing the control commands, via a transmission control system, for the at least one of the traction upshifts and traction downshifts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification