Deceleration cylinder cut-off

US11352966B2 · kind B2 · utility

Assignee

• Tula eTechnology, Inc. · US

Inventors

• Steven E. Carlson · Oakland, US
• Xin Yuan · Palo Alto, US
• Siamak Hashemi · Farmington Hills, US
• Vijay Srinivasan · Durham, US
• Srihari Kalluri · Ann Arbor, US
• Andrew W. Phillips · Saline, US
• Mark A. Wilcutts · Berkeley, US
• Louis J. Serrano · Los Gatos, US
• Shikui Kevin Chen · San Jose, US

Key dates

• Filing date: Oct 28, 2020
• Grant date: Jun 7, 2022
• Expiry date: Nov 18, 2040

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Controllers and methods for managing transitions into and/or out of a cylinder cut off mode are described. In some embodiments, a skip fire based transition into a cylinder cut off mode is used in which the fraction of working cycles that are fired is gradually reduced to a threshold firing fraction. Once the threshold firing fraction has been reached, all of the working chambers are deactivated.