公开(公告)号：US09671380B2

公开(公告)日：2017-06-06

申请号：US14504478

申请日：2014-10-02

Applicant: DELPHI TECHNOLOGIES, INC.

Inventor： Konrad A. Weber ,  David A. Goulette

IPC: G01N33/00 ,  G01M15/10 ,  G01K13/00 ,  G01K7/16

CPC classification number: G01N33/0006 ,  F02D41/1466 ,  F02D41/222 ,  G01K7/16 ,  G01K13/00 ,  G01M15/102 ,  G01N15/0656 ,  G01N33/0073 ,  G01N2015/0046 ,  Y02T10/40

Abstract: A method is presented for diagnosing a particulate matter sensing system, where the system includes a sensing element having two electrodes spaced from one another. The method determining at a first time during a cool-down event a first sensing element temperature and a resistance of the sensing element, and determining at a later second time during the cool-down event a second sensing element temperature and the resistance of the sensing element. The method further includes calculating a predicted sensing element resistance at the second sensing element temperature, based on the first sensing element temperature, the resistance of the sensing element determined at the first time, and a predetermined model of the resistance vs. temperature characteristics of the sensing element. A fault condition for the system may be indicated based on a comparison of the predicted sensing element resistance at the second sensing element temperature and a measured sensing element resistance.