Mazda Motor Corporation

Takaya Okugawa

Takafumi Nishio

Toshiaki Nishimoto

Takahiro Yamamoto

Takano Nakai

Yasunori Matoba

Souichirou Chabata

Yuki Hikichi

A control device for an engineincluding cylinders, and configured to perform a reduced-cylinder operation by idling some of cylinders. The control device includes a hydraulic valve-stopping mechanismwhich closes the intake and exhaust valvesof the cylinders in response to establishment of the reduced-cylinder operation execution condition, a hydraulic variable valve timing mechanismcapable of changing a phase of the exhaust valveof the engine, and an ECUwhich controls the valve-stopping mechanismand the hydraulic variable valve timing mechanism. In response to establishment of the reduced-cylinder operation execution condition, the ECUallows the hydraulic variable valve timing mechanismto execute the phase change to the exhaust valve, and subsequently allows the valve-stopping mechanismto bring the intake and exhaust valvesof the cylinders into closed state.

Control device for engine

A control device for an engine includes a valve-stopping mechanismwhich holds intake and exhaust valvesof the first and the fourth cylinders (idle cylinders) of four cylinders in closed states, a throttle valve control unit, an ignition period control unit, and an ECUwhich controls the valve-stopping mechanism, the throttle valve control unit, and the ignition period control unit. The ECUsets a retard amount of the ignition period of the idle cylinder behind the basic ignition period at least in starting the all-cylinder operation in accordance with an amount of burned gas existing in the idle cylinder in switching to the all-cylinder operation from the reduced-cylinder operation.

A supercharging device for an engine is provided, which includes a supercharger provided to an intake passage of the engine, an actuator configured to drive the supercharger, and a controller including a processor configured to control the actuator to drive the supercharger when an operating state of the engine is in a given supercharging range, and to stop the supercharger when the operating state is in a non-supercharging range. The controller estimates an amount of condensate accumulated in an oil pan, and the controller causes the actuator to forcibly drive the supercharger when the estimated amount of condensate is more than a preset amount, even if the operating state is in the non-supercharging range.

Growing community of inventors

Hiroshima, Japan

Takaya Okugawa