DRIVE CONTROL SYSTEM FOR HYBRID VEHICLE

摘要

A drive control system for preventing damage from a power distribution device under a motor mode and for improving fuel efficiency. A time duration from termination of the first operating mode where a torque of the first motor is applied to the power distribution device while halting a carrier (at step S4), and a temperature of the power distribution device is estimated based on the calculated time duration (at step S13). The first operating mode is enabled if the estimated temperature is lower than a predetermined allowable temperature (at step S15), and inhibited if the estimated temperature is higher than the allowable temperature (at step S10).

主权项

1. A drive control system for a hybrid vehicle, the drive control system comprising:
an engine, a power distribution device configured to perform a differential action among a carrier rotated by an engine torque, a sun gear, and a ring gear, a braking device that is configured to selectively stop rotation of the carrier, a first motor configured such that a generating function is connected to any one of the sun gear and the ring gear, an output member that is connected to any one of the sun gear and ring gear not connected to the first motor, and a second motor that configured to generate a drive torque added to a torque of the output member, a controller that is configured to:
establish a first operating mode where the vehicle is propelled by a torque of the first motor delivered to the output member through the power distribution device while stopping the rotation of the carrier by the braking device, and the torque of the second motor added to the torque of the first motor;establish a second operating mode in which the vehicle is selectively powered by: the engine and the second motor, while allowing the carrier to rotate;calculate a time duration from termination of the first operating mode;estimate a temperature of the power distribution device based on the calculated time duration;enable the first operating mode when the estimated temperature is lower than a predetermined allowable temperature; andinhibit the first operating mode when the estimated temperature is higher than the allowable temperature.