Invention Grant
- Patent Title: EGR device
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Application No.: US17448457Application Date: 2021-09-22
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Publication No.: US11542879B2Publication Date: 2023-01-03
- Inventor: Kenichi Yamamoto , Kenji Hijikata , Masafumi Hanazawa , Tomomichi Shiono , Daisuke Kugo , Noriyuki Matsuda
- Applicant: SUBARU CORPORATION
- Applicant Address: JP Tokyo
- Assignee: SUBARU CORPORATION
- Current Assignee: SUBARU CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Troutman Pepper Hamilton Sanders LLP
- Priority: JPJP2020-159971 20200924
- Main IPC: F02D41/00
- IPC: F02D41/00 ; F02M26/52 ; F02D41/22 ; F02M26/49

Abstract:
An EGR device for a vehicle includes a valve driver, a pressure comparison unit, a freeze determination unit, and an EGR controller. The valve driver drives an EGR valve to open, when fuel cut has been continued for a predetermined time in a state where an engine speed of a vehicle's engine is equal to or higher than a predetermined rotational speed. The pressure comparison unit compares a pre-driving pressure of an engine's intake pipe with a post-driving pressure of the intake pipe. The freeze determination unit sets a flag indicating that the EGR valve is frozen when a difference between the pre-driving pressure and the post-driving pressure is less than a predetermined value and an external temperature is less than a threshold. When the flag has been set, the EGR controller sets a control state of the EGR valve to a closed state and stops EGR control.
Public/Granted literature
- US20220090550A1 EGR DEVICE Public/Granted day:2022-03-24
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