Fca US LLC

Changwei Cao

Mark J Duty

William Robert Mayhew

Joseph B Adams

Bruce K Geist

Thomas F Wentworth

Brian Edward Beechie

Gregory A Sbroglia

Marc H Sullivan

Raymond J Tessier, Jr

Mark C Azzaretti

David D Dicks

In-Soo Suh

Jason P Frisch

Richard G Mayer

Joseph J Sobczak

The present disclosure provides systems and methods to detect and reduce any high driveline torsional levels, such as due to the cylinder deactivation in variable displacement system engines or aggressive lock-up strategies for fuel efficiency, in automobile transmissions. The present disclosure utilizes a controller in an automobile to operate a computationally thrifty method for quickly detecting noise and vibration disturbances in the transmission. This quick detection enables fuel economic calibrations that aggressively reduce the disturbances by controlling slip in a launch device of the transmission. As problem disturbances arise, they are detected before occupants notice objectionable behavior. Once detected, the disturbances are reduced, such as by increasing launch device slip, which effectively intercepts the objectionable disturbances before they are transferred through the entire drivetrain. The present disclosure can also apply to launch devices in Dual Clutch Transmissions and Electronically-controlled Manual Transmissions.

Systems and methods for detecting and reducing high driveline torsional levels in automobile transmissions

A method for interactive transmission garage shifts includes receiving a request for a transmission garage shift; controlling the transmission to bring the vehicle to a stop state based on determining that the vehicle is rolling backwards on a grade above a predetermined grade threshold and at a speed below a predetermined speed threshold; controlling an electric park brake (EPB) to hold the vehicle at the stop state; controlling the transmission to engage a dog clutch so as to place the transmission in a forward drive gear; and controlling the EPB to i) deactivate if the dog clutch is determined to be engaged, or ii) maintain activation to maintain the vehicle at the stop state if the dog clutch is determined to be disengaged.

Interactive transmission shift techniques

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West Bloomfield, MI, United States of America

Changwei Cao