Nissan Motor Company Limited

Taisuke Ikari

Shinobu Kamada

Sho Ohtsu

At the time of increasing an actual intake air amount by increasing a valve overlap period of intake and exhaust valves (), an actual compression ratio is temporarily decreased to be lower than a steady-state target compression ratio. This makes it possible to increase the valve overlap period without causing interference of the intake and exhaust valves () with a piston ().

Control device and control method for internal combustion engine

A target compression ratio &#x3b5;(t+Tact) after a prescribed time Tact has expired from a current point of time is calculated from an intake air volume drawn into a cylinder after expiration of the prescribed time Tact from the current point of time. A control command to an electric motor that drives a variable compression ratio mechanism is calculated so as to bring an actual compression ratio &#x3b5;r(t+Tact) after the prescribed time Tact into accordance with the target compression ratio &#x3b5;(t+Tact) after the prescribed time Tact. This enables the actual compression ratio to follow the target compression ratio accurately.

Growing community of inventors

Hiratsuka, Japan

Taisuke Ikari