Control strategy for avoiding tip-in noise in a powershift...

Details Control strategy for avoiding tip-in noise in a powershift... Control strategy for avoiding tip-in noise in a powershift...

2006-05-10

2008-11-25

Ho, Ha D. (Department: 3681)

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

C477S904000

Reexamination Certificate

active

07455619

ABSTRACT:
In a motor vehicle including a power source, an accelerator pedal, a powershift transmission for producing a selected gear, first and second input shafts, a first input clutch for connecting the selected gear and the first input shaft to the power source, a second input clutch for connecting an alternate gear and the second input shaft to the power source, a method for controlling the transmission while the vehicle is coasting. Displacement of the accelerator pedal is monitored to identify a tip-out and a tip-in, and clutch slip is monitored. The first clutch is maintained in a stroked state following a tip-out and while clutch slip is less than a reference magnitude of clutch slip. When clutch slip exceeds the reference magnitude, the torque capacity of the first clutch is controlled in response to a driver demand torque. Engine torque is used to control clutch slip to the desired clutch slip and to produce a desired engine speed corresponding to the desired clutch slip.

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