Paul Robert Johnson
Land Surveyors at 12 St, Boulder, CO

5012416, Apr 30, 1991

Dec 18, 1989

7/452020

Garth H. Bulgrien - Ephrata PA
Jim E. Goodbar - Coffeyville KS
Paul W. Johnson - Boulder CO

Ford New Holland, Inc. - New Holland PA
Deere & Company - Moline IL

B60K 4108

3644241

A microprocessor controlling a shuttle shift transmission may be programmed while the gearshift lever is in neutral to preselect a forward and reverse gear into which the transmission is shifted when the gearshift lever is moved to a forward or reverse position. The microprocessor may also be programmed so that, in shifting between forward and reverse, the forward and reverse gears selected differ by a preprogrammed amount. The microprocessor may be programmed to control vehicle deceleration by selecting gears in the transmission so that the transmission and/or the vehicle engine become a load for decelerating the vehicle. In a diagnostic mode, the microprocessor executes a routine to develop a clutch calibration value which may later be used to insure uniformity of clutch operation in different vehicles, or in the same vehicle over a period of time. The normal speed ratio matching which normally takes place when shifting gears may be manually overridden by operator manipulation of the gearshift lever. The override may either terminate speed ratio matching for a particular shift, or the override may be effective for a fixed interval of time.