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:
Mar. 28, 2017
Filed:
Dec. 02, 2015
Baohua Qi, Marietta, GA (US);
Baohua Qi, Marietta, GA (US);
Other;
Abstract
A PM sensing device including a front sensing piece receiving an exhaust flow, a back sensing piece posited downstream from the front sensing piece, and a sensor controller electrically connected to the sensing pieces for measuring their impedances and calculate a PM sensing value accordingly. The PM sensing device has two operating modes: an impedance measurement mode, in which a PM sensing value is calculated, and a regeneration mode, in which accumulated PM is removed. Since PM is only deposited in the front sensing piece, by comparing impedances of the front and the back sensing pieces, PM sensing values can be obtained insensitive to particle size, exhaust gas temperature, and exhaust gas species. When the PM sensor is positioned in a DPF system, sensor regeneration times in a predetermined period of time after a DPF regeneration completes can be used for triggering a new DPF regeneration and detecting DPF failures.