Crankcase ventilation system with a flow control device for on board diagnostics

US11015498B2 · kind B2 · utility

Assignee

• DAYCO IP HOLDINGS, LLC · US

Inventors

• Scott Martin · Mercer Island, US
• Matthew C. Gilmer · South Lyon, US
• David E. Fletcher · Flint, US
• Mitchell Emond · Shelby Charter Township, US
• Chester E. Duffield, III · Warren, US
• David Snow
• Joseph Dennis · Wyoming, US

Key dates

• Filing date: Jan 10, 2020
• Grant date: May 25, 2021
• Expiry date: Jan 10, 2040

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16K2200/402
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Flow control devices herein have a housing defining a plurality of parallel conduits. The first conduit has a normally closed check valve defined to open under a first preselected pressure differential controlling flow through the first conduit in a first direction of flow. The second conduit has a normally neutral check valve defined to open under a second preselected pressure differential in a second direction of flow that is opposite the first direction of flow. The third conduit defines a restriction profile, i.e., has a restrictor, having a third preselected pressure differential. The flow control devices are included as part of an engine system, more specifically a crankcase ventilation breach detection system.