Engine lambda dynamic control strategy for exhaust emission reduction

US10954873B2 · kind B2 · utility

Assignee

• FCA US LLC. · US

Inventors

• Amit Shrestha · Rochester Hills, US
• Bei Jin · Rochester Hills, US
• Jingjing Li · Palo Alto, US
• Fadi Estefanous · Warren, US
• Lurun Zhong · Troy, US
• Singalandapuram Mahedevan Boopathi · Ann Arbor, US
• Mitchell Ober · Northville, US

Key dates

• Filing date: Mar 1, 2019
• Grant date: Mar 23, 2021
• Expiry date: Mar 1, 2039

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2250/36
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An emissions control system for a vehicle having an exhaust system with an exhaust gas conduit and a catalytic converter configured to receive exhaust gas from an engine is provided. In one example implementation, the system includes an engine controller configured to control the engine to adjust an air to fuel ratio (lambda) thereof. The engine controller is configured to operate the engine with at least one of the following lambda control strategies (i) a first control strategy comprising operating at a first reference lambda modified by a first percent kick, and a first rich lambda lag time shorter than a first lean lambda lag time, and (ii) a second control strategy comprising operating at a second reference lambda modified by a second percent kick, and a second rich lag time longer than a second lean lambda lag time, to thereby simultaneously meet predetermined NOx and CO emissions targets.