Method for operating an engine in a hybrid powertrain system

US8010247B2 · kind B2 · utility

Assignees

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US
• Daimler AG · DE
• Chrysler Group LLC · US
• Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

• Anthony H. Heap · Ann Arbor, US
• John L. Lahti · Novi, US
• Anthony J. Corsetti · Rochester Hills, US

Key dates

• Filing date: Oct 16, 2008
• Grant date: Aug 30, 2011
• Expiry date: Oct 10, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T90/16
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An engine and an electric machine are operative to communicate tractive power with a transmission device to control output power to an output member. The electric machine is electrically coupled to an energy storage device. A method for controlling the engine and electric machine includes monitoring an operator request for power, monitoring a state of charge of the energy storage device, determining an operating cost for each of a plurality of candidate engine operating points based on the operator request for power and the state of charge of the energy storage device; and operating the engine at the candidate engine operating point having a preferred operating cost.