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:
Sep. 09, 2003
Filed:
Oct. 31, 2001
Richard R. Dickson, Peoria, IL (US);
Russell R. Graze, Jr., Dunlap, IL (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A method for controlling the dilution air supply to a partial flow dilution tunnel in a gas sampling system is provided. The gas sampling system is capable of testing and certifying internal combustion engines under transient conditions and includes a partial flow dilution tunnel, master and slave mass flow controllers and a transient dilution air flow controlling arrangement. The transient dilution air flow controlling arrangement measures the transient changes in intake air and varies the flow of diluent air to the partial flow dilution tunnel. By controlling the diluent air in this manner ensures that a particle sample can be taken at any time that is at a constant proportion to the exhaust flow rate.