Mazda Motor Corporation

Taketoshi Yamauchi

Ken Yoshida

Jiro Kato

Mitsuo Hitomi

Toshiaki Nishimoto

Kouji Asanomi

Ryotaro Nishida

Hidesaku Ebesu

Takayoshi Hayashi

Shuhei Tsujita

Mitsunori Wasada

Yoshiyuki Shinya

Kouji Sumida

Hisayuki Yamane

Yoshihiro Hamazume

Hirofumi Shinohara

Masafumi Nakano

Kenji Takami

Keiji Araki

Noriyuki Iwata

Masayoshi Higashio

Hirokazu Matsuura

Kouichi Shimizu

Tatsuya Koga

Takuya Yamada

Tomoaki Fujiyama

Ryo Yamamoto

Haruna Yanagida

Kensuke Ashikaga

Tsukasa Hoshino

Kazuaki Tanaka

Eiji Takano

Mitsutaka Yamaya

Shouichi Aiga

Takashi Yoshikawa

Kazuhiro Nakamura

Katsuya Rokuyama

Kosuke Miyamoto

Yoko Inami

An exhaust gas recirculation (EGR) passage is connected with an intake passage (a bypass passage bypassing a supercharger) of an engine. The EGR passage includes, in a position close to a connection port to the intake passage, an expanding portion in which a passage cross-sectional area expands and which lowers a flow speed of EGR gas so as to reduce an uneven flow, in the connection port, of the EGR gas flowing into the intake passage.

Air intake device for engine

An intake device of an engine comprises an intercooler, an intake passage including a downstream-side intake passage, and an EGR passage recirculating exhaust gas to the downstream-side intake passage. An intake-air supply opening having an opening area smaller than an area of a downstream-side face of an intercooler core is provided at a downstream side wall of a chamber. The downstream-side intake passage includes an extension passage portion extending upwardly along the downstream side wall. The intake-air supply opening includes an upper edge portion which separates the intake air flowing from an inside wall face of the extension passage portion and forms flowing main streams of the intake air inside the extension passage portion. EGR introduction ports are arranged at positions capable of supplying the EGR gas toward the flowing main streams.

Intake device of engine

An intake passage of an engine includes a throttle valve, a supercharger, and a bypass passage connecting an upstream side with a downstream side of the supercharger and opening when the supercharger is not acting. When the supercharger is not acting, the intake passage generates forward flows in which intake air flows from the throttle valve toward the supercharger and bypass-directed flows in which the intake air is reversed due to blockage of forward movement by the supercharger and flows from the supercharger side toward a connection port, of the bypass passage, opening in the intake passage. An evaporated fuel introduction opening leading evaporated fuel produced in a fuel tank to the intake passage opens in a wall surface, on which the bypass-directed flow is generated, in the intake passage.

Evaporated fuel treatment device for engine

The present disclosure provides sufficient support rigidity of a supercharger and an intercooler, while reducing an increase in the overall height of an engine. The supercharger extends along a cylinder bank at a side of a surge tank, and is fixed to an intake manifold. The intercooler is located below the supercharger. A case of the intercooler is connected to a discharge port of the supercharger and an intake air introduction pipe of the intake manifold.

Engine with supercharger

The present disclosure aims to improve circulation of intake air and distribution of bypass intake air to cylinders, while reducing an increase in the overall height of an engine. A supercharger extends along a cylinder bank at a side of a surge tank extending along the cylinder bank. A bypass pipe branching off from an upstream intake pipe configured to introduce the intake air into the supercharger extends along the cylinder bank above the supercharger. A downstream side intake pipe configured to guide the intake air from the supercharger to the surge tank extends downward from the supercharger. The downstream intake pipe is, in a U-shape as viewed along the cylinder bank, connected to the surge tank.

Engine with supercharger arrangement

For the purpose of improving the fuel efficiency by lean combustion and enhancing the fuel efficiency improvement effects by performing compression ignition efficiently in some cylinders, a multi-cylinder spark ignition engine is constructed such that exhaust gas, that is exhausted from preceding cylindersA,D on the exhaust stroke side among pairs of cylinders whose exhaust stroke and intake stroke overlap in a low load, low rotational speed region, is directly introduced through an inter-cylinder gas passageinto following cylindersB,C on the intake stroke side and only gas exhausted from the following cylindersB,C is fed to an exhaust passage, which is provided with a three-way catalyst. Combustion controller is provided that controls the combustion of each of the cylinders such that combustion is conducted by forced ignition in a condition in which the air/fuel ratio is a lean air/fuel ratio which is larger by a prescribed amount than the stoichiometric air/fuel ratio in the preceding cylindersA,D and, in the following cylindersB,C, fuel is supplied to burnt gas of lean air/fuel ratio introduced from the preceding cylindersA,D and combustion is conducted by compression ignition.

Spark ignition engine control device

The invention is intended to provide improved emission-cleaning performance by use of a three-way catalyst alone, without the need for a lean NOx catalyst, while ensuring a fuel economy improvement effect of lean burn operation. A multicylinder spark-ignition engine is constructed such that, in a pair of preceding and following cylinders whose exhaust and intake strokes overlap each other, burned gas discharged from the preceding cylinder (A,D) which is currently in the exhaust stroke is introduced directly into the following cylinder (B,C) which is currently in the intake stroke through an intercylinder gas channel () and gas discharged from only the following cylinder (B,C) is led to an exhaust passage () provided with a three-way catalyst () in a low-load, low-speed operating range. Fuel supply to the individual cylinders is controlled in such a manner that combustion in the preceding cylinder (A,D) is made under lean mixture conditions at an air-fuel ratio larger than the stoichiometric air-fuel ratio by a specific amount and combustion in the following cylinder (B,C) is made under conditions of the stoichiometric air-fuel ratio created by supplying fuel to the burned gas introduced from the preceding cylinder (A,D).

Control device for spark-ignition engine

In a partial load range of the engine, control of the flowing state of sucked and discharged gas is executed between a pair of cylinders, an exhaust stroke of one of the cylinders overlapping with an intake stroke of the other, so that burnt gas discharged from preceding cylindersA,D on the exhaust-stroke side is introduced, in a state where it has been discharged, through an inter-cylindrical gas passageinto following cylindersB,C on the intake stroke side. In a higher load range than the partial load range, control is executed so that a fresh-air introducing valvedisposed in a fresh-air introduction passage of the following cylindersB,C is opened, both the burnt gas and fresh air are introduced into the following cylindersB,C, and fuel is supplied to conduct combustion in the following cylindersB,C.

Control unit for spark ignition-type engine

A valve driving device including a tappet assembly adapted to slide in a tappet guide hole to drive a valve and including a high-speed center tappet and low-speed side tappet; and a high-speed center cam and a low-speed side cam provided corresponding to the center tappet and the side tappet. A depression is formed which is depressed from a base circle to roughly the same profile as a shaft section of the camshaft so that the cam portion over a predetermined angle range where a cam nose section is not formed in the centrally located center cam is smaller than the base circles of the outside located side cams in profile.

Valve driving device for an engine

Growing community of inventors

Aki-gun, Japan

Taketoshi Yamauchi