Oil supply device and control method for electric vehicle powertrain
AssigneesHyundai Motor Company, Kia Corporation
InventorJin Young HWANG
Life of this patent
Estimating the term…
Abstract
An oil supply device for an electric vehicle powertrain apparatus, includes an electric oil pump, a motor lubrication flow path connected to the electric oil pump and provided to supply oil from the electric oil pump to a bearing of a motor, a motor cooling flow path branched from the motor lubrication flow path to supply oil for cooling the motor from the electric oil pump, and a cooling control valve apparatus provided in the motor cooling flow path to control oil supplied to the motor through the motor cooling flow path according to an operating state of the electric oil pump.
Claims9
1-12. (canceled)
An oil supply control method for an electric vehicle powertrain apparatus, the method comprising:
- determining whether a motor temperature is equal to or greater than a predetermined cooling start temperature;
- when the motor temperature is equal to or greater than the predetermined cooling start temperature, increasing a speed of the electric oil pump to a predetermined opening speed or higher than the predetermined opening speed;
- when the speed of the electric oil pump increases to the predetermined opening speed or more than the predetermined opening speed, controlling the electric oil pump in a motor cooling-integrated mode including cooling of a motor;
- determining whether the motor temperature is equal to or lower than a predetermined cooling stop temperature during the motor cooling-integrated mode;
- when the motor temperature is equal to or lower than the predetermined cooling stop temperature, lowering the speed of the electric oil pump to a predetermined closing speed or less than the predetermined closing speed;
- and
- when the speed of the electric oil pump is lowered to the predetermined closing speed or less than the predetermined closing speed, controlling the electric oil pump in a motor cooling-excluded mode in which the cooling of the motor is excluded.
Dependencies are inferred from the claim text.