Nissan Motor Company Limited

Renault S.a.s.

Hiroki Ichihara

Tomoya Tojo

Katsutoshi Nakamura

Takashi Tanabe

Tsuyoshi Arinaga

Hidehiro Fujita

Satoru Ookuma

Kensuke Ikehara

A hybrid vehicle includes an internal combustion engine and a motor generator, wherein the internal combustion engine includes a variable compression ratio mechanism structured to vary in mechanical compression ratio depending on variation in position of a compression ratio control member structured to move due to driving of an electric actuator. A control method for the hybrid vehicle includes: measuring a state of charge of a battery connected to the motor generator; and in response to regenerative operation of the motor generator in a state that the state of charge of the battery is equal to or higher than a predetermined level, consuming generated electric power by driving the electric actuator of the variable compression ratio mechanism.

Control method and control device for hybrid vehicle

A lower link () is provided with an oil hole () in a crank pin bearing portion () in order to supply a jet of oil to a connecting portion between an upper pin () and an upper link (). Oil hole () is composed of a first oil hole () linearly extending from the inner peripheral surface of crank pin bearing portion () outwardly in the radial direction, and a second oil hole () linearly extending from the outer surface of lower link () so as to intersect a distal end portion of first oil hole (). An inclination angle (θ) of first oil hole () with a divided surface () set as a reference becomes relatively small, and hence the position of an oil inlet () involving a problem of stress concentration becomes closer to divided surface () exhibiting a relatively low stress. Consequently, the stress concentration at oil inlet () is alleviated.

Lower link of internal combustion engine

An upper oil pan assembly is attached to the lower portion of a cylinder block. An opening is formed on a side wall of the upper oil pan assembly. The variable compression ratio mechanism changes a top dead center position of a piston in accordance with the rotational position of a control shaft to thereby change the compression ratio. The control shaft is rotationally driven by an actuator. At least a portion of the actuator is fixed to a main bearing cap in a state in which at least a portion thereof is positioned on the outer side of an upper oil pan assembly.

Variable-compression-ratio internal combustion engine

Growing community of inventors

Kanagawa, Japan

Hiroki Ichihara