Patent Number: 6,253,749

Title: Valve and valve control method

Abstract: A vacuum actuated valve uses a specially designed spring having a spring rate as a function of valve position. The spring rate function is determined using physical relationships between flow, pressure, and valve s position. The result is that the relationship between the control input to the valve (either a vacuum signal, or an electrical signal to a vacuum source) and the flow through the valve are linearly related through the entire operating region of the valve.

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

Assignee: Ford Global Technologies, Inc.

International Classification: F02D 21/08 (20060101); F02D 21/00 (20060101); F02M 25/07 (20060101); F02M 025/07 ()

Expiration Date: 07/03/2018