Powertrain-cooling system of hybrid vehicle
AssigneesHyundai Motor Company, Kia Corporation
InventorsSe Hwan Jo, Seong Min Son, Kyung Moo Lee, Bong Uk Bae
Life of this patent
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Abstract
A powertrain-cooling system of a hybrid vehicle may include an electric oil pump, a pressure control valve, which includes an input port receiving fluid discharged from the electric oil pump, an output port outputting the fluid to a transmission while adjusting the pressure of the fluid, and a drain port discharging a portion of the fluid in accordance with adjustment of the pressure of the fluid, a first motor cooling path connecting the drain port of the pressure control valve to a first motor forming a hybrid powertrain, and a controller electrically connected to the electric oil pump and configured for controlling the electric oil pump to cool the transmission and the first motor.
Claims15
A powertrain-cooling system of a vehicle, the powertrain-cooling system comprising:
- an electric oil pump;
- a pressure control valve including an input port receiving a fluid discharged from the electric oil pump, an output port outputting the fluid to a transmission while adjusting a pressure of the fluid, and a drain port discharging a portion of the fluid according to adjustment of the pressure of the fluid;
- a first motor cooling path connecting the drain port of the pressure control valve to a first motor forming a hybrid powertrain;
- and
- a controller electrically connected to the electric oil pump and configured for controlling the electric oil pump to cool the transmission and the first motor,
- wherein the transmission is provided with a second motor forming the hybrid powertrain,
- wherein an engine clutch is mounted between the first motor and the second motor, and
- wherein a flow rate control device is connected to the output port of the pressure control valve to control a state in which a portion of the fluid which is supplied from the pressure control valve to the transmission is supplied to the second motor and the engine clutch.
A method of controlling a powertrain-cooling system having an electric oil pump, a pressure control valve including an input port receiving a fluid discharged from the electric oil pump, an output port outputting the fluid to a transmission while adjusting a pressure of the fluid, and a drain port discharging a portion of the fluid according to adjustment of the pressure of the fluid, a first motor cooling path connecting the drain port of the pressure control valve to a first motor forming a hybrid powertrain, a controller electrically connected to the electric oil pump and configured for controlling the electric oil pump to cool the transmission and the first motor, a second motor forming the hybrid powertrain, an engine clutch mounted between the first motor and the second motor, wherein a flow rate control device is connected to the output port of the pressure control valve to control a state in which a portion of the fluid which is supplied from the pressure control valve to the transmission is supplied to the second motor and the engine clutch, the method comprising:
- determining whether a temperature of the first motor exceeds a predetermined first reference temperature;
- wherein, upon concluding that the temperature of the first motor exceeds the predetermined first reference temperature, determining an incremental number of revolutions per minute (RPM) of the electric oil pump and a maintenance time;
- increasing the RPM of the electric oil pump by the determined incremental RPM;
- and
- maintaining the increased RPM for the maintenance time.
Dependencies are inferred from the claim text.