The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Nov. 25, 1998
John E. Cook, Chatham, CA;
Murray F. Busato, Clinton Township, MI (US);
Siemens Canada Ltd., Mississauga, CA;
Abstract
An electric EGR module has a main flow passage containing a valve member operated by a movable actuator wall of a fluid pressure actuator to control exhaust gas flow through the passage. The movable actuator wall bounds a portion of a variable volume chamber space to which regulated vacuum from an electric vacuum regulator (EVR) valve is communicated to position the movable actuator wall, and hence the valve member. An internal pressure sensing passage, which includes a tube that also functions as a shaft for coupling motion of the actuator wall to the valve member, communicates pressure at one side of an orifice in the main flow passage to a pressure sensor. The tube communicates with a variable volume chamber space that forms a portion of the sensing passage and that varies in volume with the positioning of the tube by the actuator wall. The pressure sensor and the EVR valve are integrated with the body of the fluid pressure actuator.