System and method for controlling engine clutch slip for a hybrid vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsYoung Chul Kim, Sang Hyun Jeong
Life of this patent
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Abstract
A system and method for controlling engine clutch slip for a hybrid vehicle, in which it is determined whether an engine clutch has entered a slip mode and lubrication of the engine clutch is easily achieved through an additional lubrication hydraulic pressure circuit whenever the engine clutch enters the slip mode, thereby achieving the engine clutch slip control in all shift ranges including low-speed and medium-speed ranges and maintaining the heat energy that is generated from the engine clutch at a predetermined level or lower.
Claims13
A system for controlling engine clutch slip for a hybrid vehicle, the system comprising:
- a supply line for guiding oil to be supplied to an engine clutch;
- a circulation line for guiding oil discharged from the engine clutch;
- a lubrication oil flow rate control valve mounted between the supply line and the circulation line so as to be connected thereto in order to control a lubrication oil flow rate;
- a first ON/OFF solenoid valve connected to the lubrication oil flow rate control valve, the first ON/OFF solenoid valve receiving line pressure applied thereto by operation of an electric oil pump;
- and
- a second ON/OFF solenoid valve connected to the lubrication oil flow rate control valve, the second ON/OFF solenoid valve receiving line pressure applied thereto by operation of the electric oil pump.
A method for controlling engine clutch slip for a hybrid vehicle, the method comprising:
- determining whether an engine clutch is in a slip mode using a transmission control unit or a high-level control unit;
- upon determining that the engine clutch is in the slip mode, controlling a second ON/OFF solenoid valve such that the second ON/OFF solenoid valve is switched ON irrespective of ON/OFF-operation of a first ON/OFF solenoid valve using the transmission control unit;
- and
- supplying oil for lubrication and cooling to the engine clutch using line pressure applied to the second ON/OFF solenoid valve in accordance with ON-operation of the second ON/OFF solenoid valve.
Dependencies are inferred from the claim text.