HYBRID VEHICLE DRIVING SYSTEM

摘要

The present invention provides a hybrid vehicle driving system in which quick response and improvement in fuel economy are compatible. A hybrid vehicle driving system 1 of the invention includes a cylinder deactivated operation necessity determination unit for determining the necessity of a cylinder deactivated operation of an engine 6 when a required driving force required on a vehicle is smaller than a driving force of the engine 6 that runs in the cylinder deactivated operation. When the cylinder deactivated operation is determined to be unnecessary by the cylinder deactivated operation necessity determination unit, the vehicle can be driven in an EV driving by disengaging a first clutch 41 and a second clutch 42, whereas when the cylinder deactivated operation is determined to be necessary by the cylinder deactivated operation necessity determination unit, the engine 6 runs in the cylinder deactivated operation and at least one of the first clutch 42 and the second clutch 42 is engaged.

主权项

1. A hybrid vehicle including an internal combustion engine that can be switched to an all cylinder activated operation where all cylinders are activated for operation and a cylinder deactivated operation where at least part of the cylinders is deactivated for rest, and an electric motor, as drive sources, the hybrid vehicle comprising:
a battery that supplies electric power to the electric motor; a change-speed mechanism that transmits mechanical power from an output shaft of the internal combustion engine and the electric motor in a state that the output shaft is selectively connected with the electric motor by a first engaging and disengaging portion, wherein: the hybrid vehicle driving system characterized by further comprising a cylinder deactivated operation necessity determination unit for determining on the necessity of the cylinder deactivated operation based on a required driving force required on the vehicle; when a quick response is required, and when the cylinder deactivated operation is determined to be unnecessary, the vehicle can be driven in the EV mode, only by a driving force of the electric motor, by disengaging the first engaging and disengaging portion; when the cylinder deactivated operation is determined to be necessary, the cylinder deactivated operation is performed and the first engaging and disengaging portion is engaged; and the cylinder deactivated operation necessity determination unit determines that the cylinder deactivated operation is necessary when the hybrid vehicle is coasting down.