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:
Apr. 02, 2002
Filed:
Nov. 24, 1999
Cho Y. Liang, Peoria, IL (US);
Steven R. McCoy, Washington, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An emissions diagnostic system is used with a compression ignition engine having an exhaust gas stream directed into an SCR catalyst capable of reducing NO in the exhaust gas stream. The system comprises a tank for storing a solution of urea, a pump in fluid communication with the tank for drawing the solution of urea from the tank, a valve in fluid communication with the pump and the exhaust gas stream for receiving the solution of urea from the pump, an air pump connected to the valve for providing air into the valve for mixing with the solution of urea, the valve for spraying the solution of urea into the exhaust gas stream, a sensor for sensing the level of NO emissions emitted by the SCR catalyst, and a control module connected to the sensor for determining whether the level of NO emissions is at an acceptable level.