Engine transient mitigation for hybrid vehicles

US8285470B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Qing Wang · Kowloon, CN
• Fazal Urrahman Syed · Canton, US
• Brandon R. Masterson · Dexter, US
• Xiaoyong Wang · Sunnyvale, US
• Ming Lang Kuang · Canton, US
• Ryan Abraham McGee · Ann Arbor, US

Key dates

• Filing date: Oct 29, 2010
• Grant date: Oct 9, 2012
• Expiry date: Jan 28, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/62
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method and system for limiting a fast transient in an engine in a hybrid vehicle is provided. The predicted fuel loss percentage is calculated from an inferred air-fuel ratio (inferred lambda). The rate limit term is calculated from a measured air-fuel ratio (measured lambda) and an engine torque command change rate. The predicted fuel loss percentage and the rate limit term are inputs into a calibration table to determine an engine power rate limit and an engine torque rate limit. An engine torque command is limited using the engine torque rate limit to control a fast engine torque transient for an engine. An engine power command is limited using the engine power rate limit to control the fast engine power transient for the engine.