Fca US LLC

Chrysler Group LLC

Kenneth Pachucki

Donald F Schmanski

Joseph E Kubina

Richard G Reed, Jr

Mircea Gradu

Michael P Kirk

Jeffrey M Orzechowski

Aaron Evans Thompson

Richard Stephen Silbert

Gregory A Sbroglia

Michael W Gapski

Robert R Roco

Urmit Patel

Swapneel H Gharpure

A vehicle includes an engine, a pair of front axle shafts, and a transfer case having a clutch assembly configured to selectively move between a closed position to enable the engine to drive the front axle shafts, and an open position to disable the engine from driving the front axle shafts. A control system is configured to momentarily open the clutch assembly when the vehicle is coming to a stop or is stopped in order to relieve residual torque build-up in the front axle shafts to thereby reduce idle vibration transmission between the engine and a body of the vehicle.

Transfer case control to relieve front driveline residual torque

A vehicle drive system capable of selectively providing all-wheel drive and single-driven-axle modes includes a front drive unit having a planetary gearset with a grounded ring gear and a sun gear driven by the transaxle's drive spool via an input shaft, and a differential selectively coupled by a dog clutch to one of the sun gear or the planetary carrier, or neither of them, to thereby selectively provide both an available low range and a front axle disconnect. The front drive unit further defines a power take-off unit with a clutch selectively coupling the input shaft to a propshaft. The rear drive unit includes a planetary gearset with a grounded ring gear, a sun gear driven by the propshaft, and a differential selectively coupled by a dog clutch to one of the sun gear or the planetary carrier, or neither of them, to thereby likewise selectively provide both an available low range and a rear axle disconnect.

Multi-mode drive system for transaxle applications

A method of operating a multi-mode drive system that precisely orchestrates a shift between gear ratios in a power take off unit and a rear drive module. The method first shifts between gear ratios in the power take off unit and then, depending upon the success or failure of the shift of the power take off unit, shifts between gear ratios in the rear drive module.

Control strategies for a multi-mode drive system

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Lapeer, MI, United States of America

Kenneth Pachucki