Mazda Motor Corporation

Tadasu Hashiguchi

Atsushi Inoue

Masanari Sueoka

Kota Matsumoto

Takashi Youso

Kazuhiro Nagatsu

Tomokuni Kusunoki

Keitaro Ezumi

Masami Nishida

Mitsunori Wasada

Masatoshi Hidaka

Toshiaki Takahashi

Akitomo Takagi

Kazuhiro Takemoto

Tadatomo Toda

Kazufumi Kumakura

Tomohiro Hasegawa

Disclosed is a control device for a multi-cylinder engine having a combustion chamber () to which an intake port () and an exhaust port () are connected. The control device comprises: an intake-side variable valve operating mechanism () for controlling a lift timing of two intake valves () of the intake port (); an exhaust-side variable valve operating mechanism () for controlling a lift timing of an exhaust valve (); and an exhaust-side valve operating mechanism () for driving an exhaust valve () at a fixed timing. The control device is operable, when executing cylinder deactivation in a low engine load and low engine speed operating range, to cause the exhaust-side variable valve operating mechanism () to open the exhaust valve () during downward movement of a piston () in a cylinder () being subjected to the cylinder deactivation.

Controller for multi-cylinder engine

The axial line of an intake valve is inclined, and a gap between a piston crown surface and a valve head of the intake valve expands in accordance with the approach of the crankshaft axis. A relationship of G&#x3e;Gis fulfilled, where Gstands for a minimum gap between the lower surface of the cylinder head that is positioned between the intake valve and the exhaust valve facing the intake valve, with the crankshaft axis being interposed therebetween, and the piston crown surface in a top dead center, and Gstands for a gap at a position that is the closest to the crankshaft axis, from among the gaps between the lower surface of the valve head of the intake valve and the piston crown surface at a center timing of a valve overlap period in which the intake valve and the exhaust valve are both open.

Combustion chamber structure for engine

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Hiroshima, Japan

Tadasu Hashiguchi