Gm Global Technolgoy Operations, Inc.

Daniel J Wickman

Jayson S Schwalm

Scott A Hearld

Chunhao J Lee

Farzad Samie

Christopher E Whitney

Paul G Otanez

Jeffrey M Kaiser

Igor Anilovich

William Leonard Aldrich, Iii

Xuefeng Tim Tao

John W Siekkinen

Xu Chen

Douglas J Moening

Glenn W Hoefflin

John William Boughner

A method of controlling a dual clutch transmission (DCT) for a vehicle includes steps to reduce objectionable noise present during particular driving conditions and when the vehicle is operated using certain driving habits. A DCT engages at least two gear ratios at a time; one gear ratio for the current desired gear and a second gear ratio for the next likely gear. The method detects when conditions are favorable for the objectionable noise and takes action to remove the cause of the objectionable noise.

Method of controlling a dual clutch transmission

A control system for a vehicle, comprises a torque determination module, a control module, and a transmission control module. The torque determination module determines torque produced by an internal combustion engine. The control module sets a signal to an active state when the torque is greater than a predetermined torque and a slip amount between an engine output speed and a transmission input speed is zero. The predetermined torque corresponds to a potential vibration amount when the slip amount is zero. The transmission control module selectively increases the slip amount above zero in response to the setting of the signal to the active state.

Driveline stiffness control systems and methods

A method for responding to a rapid change in engine torque includes monitoring a change in engine torque and determining a rapid change in engine torque when the change in engine torque exceeds a threshold change in engine torque. Subsequent to determining a rapid change in engine torque, an increase in the torque converter slip is provided by reducing the torque converter clutch pressure command by a selected value and thereafter the feedback control is deactivated for a predetermined duration. Subsequent to the predetermined duration, the feedback control is reactivated to decrease the torque converter slip toward a desired torque converter slip value.

Closed-loop feedback control and reduction of the torque converter clutch slip for enhanced drivability for heavy tip-in maneuvers

A system comprises a post oxygen performance diagnostic (POPD) module that performs a POPD of a post oxygen sensor, wherein the POPD includes a deceleration fuel cutoff (DFCO) portion. A torque converter control module adjusts operation of a torque converter clutch (TCC). The POPD module and the torque converter control module operate the TCC to control engine speed above a predetermined engine speed during the DFCO portion of the POPD. A method comprises performing a POPD of a post oxygen sensor, wherein the POPD includes a deceleration fuel cutoff (DFCO) portion and adjusting operation of a torque converter clutch (TCC) to control engine speed above a predetermined engine speed during the DFCO portion of the POPD.

Torque converter clutch control system and post oxygen sensor performance diagnostic system

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Plymouth, MI, United States of America

Daniel J Wickman