Mazda Motor Corporation

Kouichi Shimizu

Ken Yoshida

Masaki Fukuma

Ryotaro Nishida

Hidesaku Ebesu

Masahiro Naito

Takashi Kashiwabara

Tsukasa Hoshino

Hirofumi Shinohara

Yasushi Nakahara

Mitsunori Wasada

Shuhei Tsujita

Taketoshi Yamauchi

Tatsuya Koga

Jiro Kato

Tsuyoshi Yamamoto

Akira Asai

Eiji Takano

Mitsutaka Yamaya

Yoshihiro Hamazume

Manabu Sugimoto

Hisayuki Yamane

Nozomu Hachiya

Kazuhiro Tomizawa

Ikuma Takahashi

Masahiko Tanisho

Masafumi Nakano

A determination is made whether or not the condition that the amount V of condensed water remaining in an intake passage has exceeded a predetermined upper limit has been met, based on an input parameter associated with the amount V. If, during an engine operation in an unsupercharged mode, a determination is made that the condition has been met, a condensed water discharging operation of a supercharger is performed such that the condensed water remaining is discharged to a cylinder of the engine through operation of the supercharger.

Engine control device and engine control method

An intake passage includes: a main intake passage provided with a throttle valve and extending from one side toward the other side along a cylinder bank; and a bypass passage provided with an EGR valve and connected to a part of the main intake passage located toward the other side with respect to the throttle valve. The bypass passage extends from a branch of the main intake passage toward the one side and then turns back and extends toward the other side. The EGR valve is located in a part of the bypass passage extending toward the other side and overlapping with a part extending from the branch to the one side.

Engine intake system

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

Substances in external EGR gas are smoothly guided to a combustion chamber. An intake passage includes: a main intake passage including intake ports and communicating with a combustion chamber and having a supercharger interposed in the main intake passage; and a bypass passage branching off from the main intake passage upstream of the supercharger, and connected downstream of the supercharger; a flow rage adjustment valve changing a cross-sectional flow area of the bypass passage. The bypass passage is provided above the main intake passage, and includes an upper passage to which an EGR passage is connected.

Intake and exhaust device for automotive engine

An oil supply path passes through members separate from a cylinder head () to supply a lubricant to bearings () of camshaft journals. The oil supply path includes an oil supply passage () for the camshaft above the camshaft (), a connection passage () for the camshaft between the oil supply passage for the camshaft and an internal passage () in the cylinder head (), and branch oil passages () for the camshaft journals. Each branch oil passage branches off from the oil supply passage for the camshaft, and is connected to one of the bearings () from above. Each of the branch passages includes a throttle () with a smaller cross-sectional flow area than the oil supply passage for the camshaft.

Cam journal lubricant supply mechanism for engine

A blow-by gas recirculating apparatus includes: an oil separator provided to a side surface of a cylinder block at one side of an engine; a communication part providing communication between a blow-by gas outlet port of the oil separator and an intake manifold; and a PCV valve. The PCV valve is provided to the intake manifold, and the communication part is connected to the PCV valve. The PCV valve provided to the intake manifold is positioned above the blow-by gas outlet port of the oil separator with the engine mounted on a vehicle.

Blow-by gas recirculating apparatus

In the variable valve timing system according to the present invention, portions of the intake-side advancing hydraulic line and a retarding hydraulic line respectively constitute annular groovesandfor advancing and retarding provided on the intake camshaftbearing surfaceof the cam capwhich supports the camshaftsand. In addition, portions of the advancing hydraulic line and the retarding hydraulic line for exhaust respectively constitute annular grooves for advancing and retardingandprovided on the exhaust camshaftbearing surfaceof the cam cap. Moreover, the annular groove for retardingon the intake camshaftbearing surfaceand the annular groove for advancingon the exhaust camshaftbearing surfaceare respectively provided in the center in the width direction of their respective bearing surfacesand

Engine variable valve timing system

A rotational angle sensor and a hydraulic pressure control valve are disposed such that a detecting end surface of the rotational angle sensor disposed close to a sensor rotor attached to an exhaust camshaft is located in a spray area of return oil discharged through a drain hole formed at a cam cap, which flows down through a lower drain port of the hydraulic pressure control valve attached on the cam cap from a variable valve timing mechanism. Further, the detecting end surface is located forward in the rotational direction, shown as the arrow a, of the exhaust camshaft so that the return oil can be positively carried toward the detecting end surface by the rotation of the sensor rotor. Accordingly, this can maintain properly detecting accuracy of the rotational sensor disposed close to the camshaft.

Valve driving device for engine

Growing community of inventors

Higashihiroshima, Japan

Kouichi Shimizu