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1. (WO2017154988) ENGINE EXHAUST DEVICE

Pub. No.:    WO/2017/154988    International Application No.:    PCT/JP2017/009286
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Mar 09 00:59:59 CET 2017
IPC: F02D 45/00
F02B 37/02
F02B 37/12
F02B 37/18
F02D 41/12
F02D 43/00
Applicants: MAZDA MOTOR CORPORATION
マツダ株式会社
Inventors: MUROTANI Mitsuyuki
室谷 満幸
NISHIO Takafumi
西尾 貴史
TSUJITA Shuhei
辻田 周平
SUEKUNI Einosuke
末國 栄之介
UMEMURA Junji
梅村 潤司
Title: ENGINE EXHAUST DEVICE
Abstract:
In the present invention an exhaust passage 53 includes first passages (high-speed passages 24b, 25b, and 26b) and second passages (low-speed passages 24c, 25c, and 26c) and, on the downstream side of a convergence section 54, is connected to a turbine housing 560. An engine exhaust device 100 is equipped with a valve (variable exhaust valve 3) configured so as to open and close the first passages. A control unit (engine control unit 7) closes the valve when the rotational frequency of an engine 1 is lower than a prescribed rotational frequency, and opens the valve when the rotational frequency is equal to or greater than the prescribed rotational frequency. When a fuel cut control is being executed the control unit opens the valve, even when the engine rotational frequency is lower than the prescribed rotational frequency.