Abhay P Bhagwat

US Patent:

6575022, Jun 10, 2003

Filed:

Jun 24, 1998

Appl. No.:

09/105124

Inventors:

Matthew L. Schneider - Seymour IN
Abhay P. Bhagwat - Seymour IN
Alfred Schuppe - Columbus IN
George M. Kuhns - Columbus IN

Assignee:

Cummins Engine Company, Inc. - Columbus IN

International Classification:

G01M 1900

US Classification:

731182

Abstract:

An engine crankcase gas blow-by sensor. In a closed crankcase ventilation system, crankcase gases are caused to flow through a venturi which includes high pressure and low pressure taps. The high and low pressure taps are coupled to a differential pressure transducer which produces an output that is proportional to the volumetric flow of crankcase gases through the venturi. The use of a venturi in conjunction with a differential pressure sensor offers a low resistance path for the flow of crankcase gases and allows continuous monitoring of blow-by without exceeding the operating pressure limitations of various oil seals. Such a sensor is particularly suited for closed crankcase ventilation (ccv) systems, as it doesnt require venting of crankcase gases to the atmosphere, but works well in open crankcase ventilation systems also.