Method for operating a vehicle drive device with device with...

Details Method for operating a vehicle drive device with device with... Method for operating a vehicle drive device with device with...

2005-08-16

2005-08-16

Ho, Ha (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

C477S115000, C477S203000

Reexamination Certificate

active

06929579

ABSTRACT:
A motor vehicle drive arrangement including a motor and a stepless automatic transmission for driving drive wheels has a normal operating mode for normal driving operation and a brake engagement operating mode for a situation of excessive slip of a drive wheel. During the brake engagement operating mode, strong fluctuations of the transmission ratio could arise, or the vehicle might drive with a low motor torque but a high drive rotational speed, which are uncomfortable for the driver. To increase driving comfort, a normal motor torque value is prescribed in the normal operating mode, and in the brake engagement operating mode the motor torque is reduced to an actual motor torque value. A difference torque is determined between the normal and actual motor torque values. A maximum desired nominal drive rotational speed is varied dependent on the difference torque.

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