Patent Number: 6,308,694

Title: Flow measurement and control

Abstract: An exhaust gas recirculation systems directs exhaust gasses from an exhaust manifold to an intake manifold of an internal combustion engine. The exhaust gasses travel from the exhaust manifold, first passing through a flow control valve and then through a measuring orifice before entering the intake manifold. Pressure difference across the orifice is used, along with correction factors based on the pressure difference and pressure downstream of the orifice, to measure and control exhaust gas flow.

Inventors: Kotwicki; Allan Joseph (Williamsburg, MI), Russell; John David (Farmington Hills, MI)

Assignee: Ford Global Technologies, Inc.

International Classification: F02D 41/00 (20060101); F02D 21/00 (20060101); F02D 21/08 (20060101); F02M 25/07 (20060101); G01F 1/34 (20060101); G01F 1/36 (20060101); F02M 025/07 (); G01F 001/42 ()

Expiration Date: 10/30/2018