FIELD

The present invention relates to a hybrid vehicle.

BACKGROUND

Patent Literature 1 discloses that in a hybrid vehicle, an engine operating point is controlled so as to avoid a noise vibration (NV) restriction region.

CITATION LIST

Patent Literature

Patent Literature 1: Japanese Laid-open Patent Publication No. 2013-86600

SUMMARY

Technical Problem

However, in a hybrid vehicle as disclosed in Patent Literature 1, when engine rotation speed increase control of increasing an engine rotation speed is to be executed in a situation where a motor generator does not output reaction force torque and torque is not output to an output shaft, an increase in engine rotation speed may be delayed due to the NV restriction region, and the acceleration responsiveness may be deteriorated.

The present invention has been made in view of the above problem, and has an object to provide a hybrid vehicle capable of suppressing a delay in increasing an engine rotation speed due to an NV restriction region.

Solution to Problem

To resolve the above problem and attain the object, a hybrid vehicle according to the present invention includes: an engine; an output member that transmits a driving force to a drive wheel; a rotating electric machine; and a power split mechanism that splits and transmits the driving force output from the engine to the output member and the rotating electric machine, the power split mechanism including at least three rotating elements of an input element connected to the engine, a reaction force element connected to the rotating electric machine, and an output element connected to the output member, the rotating electric machine being configured to be capable of outputting a reaction force torque corresponding to required engine torque based on an acceleration request in order to apply a torque corresponding to the required engine torque to the drive wheel, in a situation where the rotating electric machine does not output the reaction force torque, engine rotation speed increase control of increasing an engine rotation speed being able to be executed, engine torque limitation due to a NV requirement being able to be executed. Further, the engine torque limitation due to the NV requirement is relaxed during the engine rotation speed increase control.

Further, in the above invention, the engine may include a supercharger, and an output torque of the engine may be increased by operating the supercharger.

As a result, the engine rotation speed can be quickly increased in order to rotate a turbine of the supercharger.

Advantageous Effects of Invention

The hybrid vehicle according to the present invention has an effect that a delay in increasing the engine rotation speed due to the NV restriction region can be suppressed by relaxing the engine torque limitation due to the NV requirement during the engine rotation speed increase control.

