Mazda Motor Corporation

Masaki Harada

Shigeaki Watanabe

Tetsushi Hosokai

Kuniyoshi Tashiro

Kazuki Yamauchi

Futoshi Nishioka

Kunitomo Minamitani

Kouichirou Waki

Yuta Takamura

Misao Fujimoto

Yasuyoshi Hori

Takuro Shigemura

Osamu Kishi

Isao Shimizu

Motohiro Ariki

Noriaki Mitobe

Masatoshi Shoji

Isamu Iguchi

Koichi Nagamoto

Hiroyuki Chado

Hideshi Terao

Masaru Shimada

Kenji Oka

Yoshiyuki Kasuga

Satoshi Harada

A lean burn engine adapted to establish a specified air-fuel ratio leaner by predetermined rate than a stoichiometric air-fuel ratio in a range of low engine speeds and low engine loads is provided with an air intake system of a low speed type which provides a high charging efficiency in a range of low engine speeds and an exhaust system capable of eliminating a nitrogen oxide emission in the exhaust even during lean burning.

Lean burn engine for automobile

An intake system for a multiple-cylinder engine a plurality of primary discrete intake passages and a plurality of secondary discrete intake passages. Each pair of primary discrete intake passage and the secondary discrete intake passage communicate with one of the cylinders. Both the primary and secondary discrete intake passages are straight and the primary discrete intake passage is provided with a primary valve member which is provided with an opening and is selectively positioned in a closed position where the primary valve member limits the effective cross-sectional area of the primary discrete intake passage to the cross-sectional area of the opening and in an open position where the primary valve member wide opens the primary intake passage. The secondary discrete intake passage is provided with a secondary valve member which is moved between a closed position where it substantially closes the secondary discrete intake passage and an open position where it wide opens the secondary discrete intake passage.

Intake system for engine

A suction apparatus for an engine is provided with an intake path which has an opening portion at one end, and the other end of which is connected to an intake pulsation generation source. A resonator is connected to a downstream portion of said intake path through a connecting pipe, for eliminating a (0.5+n)th-order (where n is an integer equal to or larger than 0) resonant wave in the intake path which is induced by a compression wave generated from said intake pulsation generation source toward the upstream side.

Suction apparatus for engine

Growing community of inventors

Hiroshima, Japan

Masaki Harada