Drive control device for hybrid vehicle

摘要

A drive control device for a hybrid vehicle is provided with a differential device including four rotary elements; and an engine, first and second electric motors and an output rotary member which are respectively connected to the four rotary elements. One of the four rotary elements is constituted by a rotary component of a first differential mechanism and a rotary component of a second differential mechanism selectively connected through a clutch, and one of the rotary components is selectively fixed to a stationary member through a brake. The drive control device stops a rotation of the engine by using the clutch or the brake when an engine speed is reduced for making a shift from an engine drive mode in which the engine is driven for running to a motor drive mode; engages the clutch or the brake to reduce the engine speed to zero after the first electric motor is used for reducing the engine speed. The first electric motor provides a feedback control such that the engine speed is reduced toward a target speed set in advance to a value larger than zero.

主权项

1. A drive control device for a hybrid vehicle provided with: a differential device which includes a first differential mechanism and a second differential mechanism and which has four rotary elements; and an engine, a first electric motor, a second electric motor and an output rotary member which are respectively connected to said four rotary elements, and wherein one of said four rotary elements is constituted by a rotary component of said first differential mechanism and a rotary component of said second differential mechanism which are selectively connected to each other through a clutch, and one of the rotary components of said first and second differential mechanisms which are selectively connected to each other through said clutch is selectively fixed to a stationary member through a brake,
said drive control device: stopping a rotation of the engine by using the clutch or the brake when an engine speed is reduced for making a shift from an engine drive mode in which the engine is driven for running to a motor drive mode; engaging the clutch or the brake to reduce the engine speed to zero after the first electric motor is used for reducing the engine speed, and the first electric motor providing a feedback control such that the engine speed is reduced toward a target speed set in advance to a value larger than zero.