Battery warm-up apparatus of hybrid electric vehicle

摘要

A hybrid electric vehicle includes a wet clutch device that establishes and interrupts a connection between an engine and an electric motor, and a transmission switchable between a driving range in which driving force can be transmitted to driving wheels and a non-driving range in which transmission of the driving force is interrupted. When a battery temperature is greater than a warm-up determination value while the vehicle is at a standstill with the transmission switched to the non-driving range, the wet clutch device is kept disengaged. When the battery temperature is less than the warm-up determination value, a battery warm-up control unit switches the wet clutch device into engaged state to connect the engine and the electric motor together and vary driving force of the electric motor alternately to a positive side and a negative side so as to repeatedly charge and discharge the battery.

主权项

1. A hybrid electric vehicle comprising:
a wet clutch device configured to establish and interrupt connection between an engine and an electric motor both serving as a traveling power source; a transmission capable of being switched between a driving range in which driving force of the traveling power source can be transmitted to driving wheels and a non-driving range in which transmission of the driving force to the driving wheels is interrupted; a battery configured to supply electrical power to the electric motor acting as a motor and to be charged by the electric motor acting as a generator, and in which the wet clutch device is kept disengaged while the vehicle is at a standstill with the transmission switched to the non-driving range; and a battery warm-up apparatus for warming up the battery comprising
a battery temperature detecting unit configured to detect a temperature of the battery; anda battery warm-up control unit configured to, when determining that the temperature of the battery detected by the battery temperature detecting unit is less than a predetermined warm-up determination value while the vehicle is at a standstill with the transmission switched to the non-driving range,
switch the wet clutch device into engaged state to connect the engine and the electric motor together, andvary driving force of the electric motor alternately to a positive side and a negative side so as to repeatedly charge and discharge the battery, wherein the wet clutch device includes a first clutch and a second clutch connected in parallel to the engine; wherein the transmission is a dual-clutch transmission including a first shifting mechanism and a second shifting mechanism connected to the first clutch and the second clutch, respectively; wherein the electric motor is interposed between the second clutch and the second shifting mechanism; wherein when the vehicle is at a standstill with the transmission switched to the non-driving range, the first clutch and the second clutch are held in disengaged state; and wherein when the temperature of the battery is judged to be less than the warm-up determination value while the vehicle is at a standstill with the transmission switched to the non-driving range, the battery warm-up control unit switches only the second clutch to engaged state and varies the driving force of the electric motor to the positive side and the negative side.