System for controlling hydraulic pressure and flow rate of oil in engine and control method thereof

Abstract

A system for controlling hydraulic pressure and flow rate of oil in an engine, may include a first solenoid valve disposed in a channel connecting an inlet and an outlet of an oil pump supplying oil from an oil pan to the engine, and an electronic controller controlling the first solenoid valve on the basis of number of revolution of the engine, load of the engine, and temperature of the oil.

What is claimed is: 
     
         1 . A system for controlling hydraulic pressure and flow rate of oil in an engine, comprising:
 a first solenoid valve disposed in a channel connecting an inlet and an outlet of an oil pump supplying oil from an oil pan to the engine; and   an electronic controller controlling the first solenoid valve on the basis of number of revolution of the engine, load of the engine, and temperature of the oil.   
     
     
         2 . The system for controlling hydraulic pressure and flow rate of oil in the engine as defined in  claim 1 , further comprising a second solenoid valve disposed in a channel connecting an inlet and an outlet of an oil cooler connected to the oil pump so as to cool the oil at the outlet of the oil pump, and controlled to operate by the electronic controller. 
     
     
         3 . The system for controlling hydraulic pressure and flow rate of oil in the engine as defined in  claim 1 , further comprising a third solenoid valve disposed in a channel connecting the oil pump to a piston cooling gallery supplying the oil discharged through the outlet of the oil pump to a piston cooling jet disposed to distribute the oil to pistons, and controlled by the electronic controller to control flow rate of the oil to the piston cooling gallery. 
     
     
         4 . The system for controlling hydraulic pressure and flow rate of oil in the engine as defined in  claim 1 , further comprising a fourth solenoid valve disposed in a channel connecting the oil pump to a head oil gallery supplying the oil discharged through the outlet of the oil pump to a cylinder head, and controlled by the electronic controller to control flow rate of the oil supplied to the head oil gallery. 
     
     
         5 . A system for controlling hydraulic pressure and flow rate of oil in an engine, comprising:
 a first solenoid valve disposed in a channel connecting an inlet and an outlet of an oil pump supplying oil from an oil pan to the engine;   a second solenoid valve disposed in a channel connecting an inlet and an outlet of an oil cooler connected with the outlet of the oil pump and cooling the oil discharged from the oil pump;   a third solenoid valve disposed in a channel formed between an oil filter and a piston cooling gallery supplying the oil to piston cooling jets such that the oil is distributed to pistons, and controlling flow rate of the oil to the piston cooling gallery;   a fourth solenoid valve disposed in a channel formed between the oil filter and a head oil gallery supplying the oil filtered through the oil filter connected with the oil cooler to a cylinder head, and controlling flow rate of the oil supplied to the head oil gallery; and   an electronic controller controlling the first solenoid valve, the second solenoid valve, the third solenoid valve, and the fourth solenoid valve, on the basis of engine parameters including number of revolution of the engine, load of the engine, and temperature of the oil.   
     
     
         6 . The system for controlling hydraulic pressure and flow rate of oil in the engine as defined in  claim 1 , wherein the electronic controller controls the first solenoid valve to control the oil supplied to a main oil gallery of the engine, in accordance with operations of the second solenoid valve, the third solenoid valve, and the fourth solenoid valve. 
     
     
         7 . A method of controlling a system for controlling hydraulic pressure and flow rate of oil in an engine, comprising the steps of:
 sensing engine parameters including number of revolution of the engine, load of the engine, and oil temperature by using sensors in a vehicle;   controlling a second solenoid valve that controls flow rate supplied to an oil cooler connected to an oil pump when the sensed engine parameters are lower or higher than reference values of the engine parameters;   controlling a third solenoid valve that controls flow rate supplied to a piston cooling gallery from the oil pump when the sensed engine parameters are lower or higher than reference values of the engine parameters;   controlling a fourth solenoid valve that controls flow rate supplied to a head gallery from the oil pump on the basis of the sensed parameters; and   controlling a first solenoid valve that controls flow rate supplied to a main gallery from the oil pump on the basis of operational states of the second solenoid valve, the third solenoid valve, and the fourth solenoid valve, and the sensed parameters.   
     
     
         8 . The method of controlling a system for controlling hydraulic pressure and flow rate of oil in an engine as defined in  claim 1 , wherein one of the sensed engine parameters in controlling the second solenoid valve is oil temperature.