公开(公告)号：US20210025314A1

公开(公告)日：2021-01-28

申请号：US16523628

申请日：2019-07-26

Applicant: Caterpillar Inc.

Inventor： Andrew M. Denis ,  Min Xiao ,  Wengang Chen ,  Zhenhua Zhang ,  Qiang Zhu ,  Mohamed I. Daoud

IPC: F01N13/00 ,  F01N11/00 ,  F01N13/08

Abstract: A NOx sensor protection system includes a flow control device forming an internal chamber with exhaust and shield gas ports and a NOx sensor. The flow control device is configured to selectively allow a flow of exhaust from an exhaust pipe to the NOx sensor when an internal combustion engine is operated with a first fuel, and to selectively direct shield gas from the shield gas port at an angle of 135° to 180° to the NOx sensor to inhibit the flow of exhaust from the exhaust pipe to the NOx sensor when the engine is operated with a second fuel.

公开(公告)号：US11098631B2

公开(公告)日：2021-08-24

申请号：US16523628

申请日：2019-07-26

Applicant: Caterpillar Inc.

Inventor： Andrew M. Denis ,  Min Xiao ,  Wengang Chen ,  Zhenhua Zhang ,  Qiang Zhu ,  Mohamed I. Daoud

IPC: F01N13/08 ,  F01N13/00 ,  F01N11/00

Abstract: A NOx sensor protection system includes a flow control device forming an internal chamber with exhaust and shield gas ports and a NOx sensor. The flow control device is configured to selectively allow a flow of exhaust from an exhaust pipe to the NOx sensor when an internal combustion engine is operated with a first fuel, and to selectively direct shield gas from the shield gas port at an angle of 135° to 180° to the NOx sensor to inhibit the flow of exhaust from the exhaust pipe to the NOx sensor when the engine is operated with a second fuel.