Driveline stiffness relaxation systems and methods for DFCO operation

US8657721B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Christopher E. Whitney · Commerce, US
• Jeremy V. Horgan · Northville, US
• Scott A. Hearld · Waterford, US
• Lars Mikael Buur · Brighton, US
• Ryan Goode · Howell, US
• Krishnendu Kar · Webster, US

Key dates

• Filing date: May 5, 2011
• Grant date: Feb 25, 2014
• Expiry date: May 7, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/20018
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A powertrain system includes an engine control module that generates a negative torque transition signal based on a pending negative torque event of an engine. A transmission control module receives the negative torque transition signal from the engine control module. The transmission control module increases a slip speed of a torque converter clutch in preparation for the pending negative torque event by adjusting pressure in the torque converter clutch prior to the pending negative torque event. The transmission control module decreases the slip speed in the torque converter clutch based on completion of a transition at least one of to the pending negative torque event and from the pending negative torque event.