Mazda Motor Corporation

Junji Umemura

Einosuke Suekuni

Shuhei Tsujita

Tomoaki Fujiyama

Yoshiyuki Uehane

Makoto Mihara

Takafumi Nishio

Masaaki Sato

Atsuhiro Hatabu

Kouji Hadama

Hideya Horii

Hisayoshi Yamada

Yuki Nabetani

Mitsuyuki Murotani

Koji Hadama

Hiroyuki Hamada

Masahiro Ikeda

An exhaust passageincludes: a first passage (high-speed passages, and); and a second passage (low-speed passages, and). A turbine housingis connected to the exhaust passagedownstream from the collector. An exhaust deviceof an engineincludes a valve (an exhaust variable valve) to open and close the first passage. A controller (an engine controller) closes the valve if an engine speed of the engineis lower than a predetermined engine speed and opens the valve if the engine speed of the engineis higher than or equal to the predetermined engine speed. The controller opens the valve even though the engine speed of the engineis lower than the predetermined engine speed if performing the fuel cut control.

Engine exhaust device

An opening/closing valve structure for an engine is provided with a valve body for opening and closing an intake passage or an exhaust passage of the engine; a pair of bush members mounted on axial ends of the valve body; and a shaft member axially passing through one of the bush members and projecting from the bush member by a predetermined length within one end of the valve body. Each of the bush members is mounted in such a manner that a part of the bush member is axially received in an end of the valve body and the remaining part thereof axially projects from the end of the valve body. A portion of the shaft member projecting from the one of the bush members is connected to the valve body in such a manner that relative rotation of the shaft member with respect to the valve body is disabled.

Opening/closing valve structure

Disclosed herein is a technique for providing an engine supercharger of a reduced size allowing an exhaust gas to be introduced smoothly into a turbine scroll. A turbine for use in this supercharger includes: a turbine lead-in route, into which the exhaust gas is introduced; a turbine scroll formed continuously with the turbine lead-in route to allow the exhaust gas to swirl around inside; a turbine wheel to turn on an axis of rotation; a turbine lead-out route; a wastegate passage to bypass the exhaust gas around the turbine scroll; and a wastegate valve. The turbine lead-in route includes a throat portion having a tapered downstream portion. The wastegate passage branches from that throat portion.

Engine supercharger

An exhaust device for an engine, interposed between an engine body, and a supercharger to be driven by a pressure of exhaust gas to be discharged from the engine body, includes a first exhaust passage and a second exhaust passage which introduce exhaust gas to the supercharger; a partition wall disposed between the first exhaust passage and the second exhaust passage, and configured to partition the first exhaust passage and the second exhaust passage from each other; and a valve disposed within the second exhaust passage, and configured to adjust the flow rate of exhaust gas flowing through the second exhaust passage. The partition wall includes a communication portion for communicating between the first exhaust passage and the second exhaust passage.

Exhaust device for engine

Disclosed herein is a technique for providing an engine supercharger allowing an exhaust gas to efficiently act on a turbine in a wide operating range. A turbine for use in a supercharger includes a turbine housing, a turbine scroll formed inside the housing continuously with a turbine lead-in route, and a turbine wheel to turn on an axis of rotation close to a tongue portion. The turbine lead-in route is partitioned by a partition wall into first and second lead-in routes. Exhaust variable valves are provided upstream of the second lead-in route in order to change the flow rate of the exhaust gas to be introduced. When viewed in the direction in which the axis of rotation extends, a downstream end of the partition is aligned with the axis of rotation and the tongue portion.

A turbocharging device of an engine for a vehicle is provided. The turbocharging device includes a turbocharger for turbocharging intake air, an introduction passage connected to an introducing section of a compressor of the turbocharger, a discharge passage connected to a discharging section of the compressor of the turbocharger, a bypass passage connecting the introduction passage to the discharge passage and bypassing the compressor, and a bypass valve for opening and closing the bypass passage. A throttle part throttling a flow passage area of the introduction passage is formed in an inner circumferential surface of a part of the introduction passage, upstream of a connection part of the introduction passage with the bypass passage.

Turbocharging device of engine for vehicle

Disclosed is an exhaust gas recirculation system for an engine (), wherein at least a downstream sub-region of a region of an exhaust passage () upstream of a turbine wheel () is divided into two sub-passages (R, R) by a partition wall () extending along an exhaust gas flow direction. A high-speed sub-passage (R) in the two sub-passages (R, R) is equipped with an openable-closable exhaust variable valve (). The exhaust variable valve () is configured to be controlled to open the high-speed sub-passage (R) when an engine speed is equal to or greater than a reference speed, and close the high-speed sub-passage (R) when the engine speed is less than the reference speed. An inlet () of an EGR passage () on the side of the exhaust passage () is opened to the high-speed sub-passage (R) at a position downstream of the exhaust variable valve ().

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Aki-gun, Japan

Junji Umemura