Gm Global Technolgoy Operations, Inc.

Dustin A Nygaard

Philip C Lundberg

Todd R Berger

David Chris Webert

Roberto Diaz

Brian W Hanselman

David H Moiseev

Joseph V Pittiglio

A method for controlling internal electronic range selection for an automatic transmission includes: confirming if a range change command has been ordered from a current transmission operating state; verifying expected performance from at least first and second mode valves and a park servo are present in the current transmission operating state prior to allowing a range change event; during the range change event: generating proactive commands including ordering a reduction in a hydraulic system pressure; and identifying if an unexpected event is detected; and following completion of the range change event confirming expected performance is obtained from at least the first and second mode valves and the park servo to achieve a driver intended state.

Method for controlling the internal electronic range selection for a 9 speed automatic transmission

A crank permission system includes first and second permission modules and a crank module. The first permission module selectively generates a first permission signal, based on a first gear range engaged within a transmission, when an ignition system transitions to crank. The second permission module selectively generates a second permission signal, based on (i) the first gear range stored when the ignition system last transitioned to off and (ii) a second gear range of the transmission requested by a driver using a transmission range selector, when the ignition system transitions to crank. The crank module begins cranking an engine via a starter, in response to the generation of at least one of the first and second permission signals, when the ignition system of the vehicle transitions to crank.

Engine cranking control systems and methods using electronic transmission range selection

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Novi, MI, United States of America

Dustin A Nygaard