METHOD FOR CONTROLLING AN AUTOMATIC MULTI-STEP SHIFT TRANSMISSION
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Accused Products
Abstract
A method of controlling an automatic transmission arranged in a vehicle between a drive motor and an axle drive of a drive axle or a transfer box such that the current road inclination is determined and, after driving onto a downhill stretch of road, to increase a braking action of the drive motor and/or a permanent brake, a shift to a lower gear is carried out and after a transition to a traction operation or after driving onto level ground, a shift to a higher gear is carried out. To improve transmission shifting behavior, when transitioning between a downhill stretch and level ground, it is provided that a function for detecting a downhill run-out is started and if a downhill run-out is detected, and a shift to a higher gear is carried out while still in a thrust operation before driving onto the level ground and/or before the transition to traction operation.
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Citations
28 Claims
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1-14. -14. (canceled)
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15. A method of controlling an automated multi-step shift transmission arranged in a drivetrain of a motor vehicle in the force flow between a drive motor and an axle drive of either a drive axle or a transfer box, such that a current road inclination (NFB) is determined and after driving onto a downhill stretch, to increase braking action of at least one of the drive motor and a permanent brake, a shift is carried out to a lower gear and at the latest after either a transition to a traction operation or a driving onto level ground a shift is carried out to a higher gear, the method comprising the steps of:
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starting a recognition function for detecting a downhill run-out at the latest after at least one of driving onto the downhill stretch and the transition to a thrust operation; and carrying out a shift to a higher gear while still in the thrust operation (thrust upshift) before at least one of driving onto the level ground and the transition to the traction operation, if a downhill run-out is detected. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification