Invention Grant
- Patent Title: EGR device
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Application No.: US16743132Application Date: 2020-01-15
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Publication No.: US10968848B2Publication Date: 2021-04-06
- Inventor: Keigo Endo , Takashi Asai , Tomoyuki Urayama
- 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: JPJP2019-054777 20190322
- Main IPC: F02B47/08
- IPC: F02B47/08 ; F02D41/00 ; F02M26/54 ; F02M26/23 ; F02M26/50

Abstract:
An EGR device includes an EGR flow path, an EGR valve, a stepping motor, a motor driver, a return spring, a speed detector, and an opening degree estimator. The EGR flow path conveys exhaust gas from an exhaust flow path of an engine to an intake flow path. The EGR valve is disposed on the EGR flow path. The stepping motor drives the EGR valve to open to close. The motor driver supplies driving power to the stepping motor. The return spring urges the EGR valve in a valve closing direction. The speed detector detects an output shaft rotation speed of the engine. The opening degree estimator estimates an opening degree of the EGR valve. The motor driver changes a drive frequency of the stepping motor according to variations of the output shaft rotation speed detected by the speed detector and the opening degree estimated by the opening degree estimator.
Public/Granted literature
- US20200300188A1 EGR DEVICE Public/Granted day:2020-09-24
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