Oil pump control system for vehicle and operation method thereof

Abstract

An oil pump control system for a vehicle includes: an oil pump to form a pressure for supplying oil to an engine, an oil pressure adjustment valve to control a pressure of the oil supplied to the engine by controlling the pressure formed by the oil pump, an oil sensor to sense the pressure and temperature of the oil supplied to the engine, and a controller to monitor vehicle information inputted from outside and the oil pressure and temperature sensed by the oil sensor, determine a target oil pressure value based on engine RPM of the monitored vehicle information and the oil temperature, and control the oil pressure adjustment valve such that the monitored oil pressure follows the determined target oil pressure value.

What is claimed is: 
     
         1 . An oil pump control system for a vehicle, comprising:
 an oil pump to form a pressure for supplying oil to an engine;   an oil pressure adjustment valve fluid-connected to the oil pump to control a pressure of the oil supplied to the engine by controlling the pressure formed by the oil pump;   an oil sensor to sense the pressure and an temperature of the oil supplied to the engine; and   a controller to monitor a vehicle information inputted from outside and the pressure and the temperature sensed by the oil sensor, wherein the controller determines a target oil pressure value based on an engine RPM of a monitored vehicle information and the oil temperature, and control the oil pressure adjustment valve such that a monitored oil pressure follows a determined target oil pressure value.   
     
     
         2 . The oil pump control system of  claim 1 , wherein the oil pump includes a first chamber connected to an oil pump outlet fluid-connecting to the engine and a second chamber connected to the oil pressure adjustment valve, wherein an internal pressure of the second chamber is controlled by the oil pressure adjustment valve. 
     
     
         3 . The oil pump control system of  claim 2 , wherein the oil pressure adjustment valve includes a three-port two-way solenoid valve having a P port connected to a first branch diverging from the oil pump outlet, an A port connected to the second chamber, and a T port connected to an oil pan. 
     
     
         4 . The oil pump control system of  claim 2 , wherein the oil pressure adjustment valve includes a three-port two-way solenoid valve having a P port connected to a second branch diverging from a main gallery connected to the first chamber, an A port connected to the second chamber, and a T port connected to an oil pan. 
     
     
         5 . The oil pump control system of  claim 1 , wherein the controller monitors whether the oil sensor and the oil pressure adjustment valve are normal or not, and
 when functions of the oil sensor and the oil pressure adjustment valve are normal as a result of monitoring, the controller performs a first mode in which the controller determines a first target oil pressure value based on the engine RPM and the oil pressure, and controls the oil pressure adjustment valve such that the monitored oil pressure follows a determined first target oil pressure value.   
     
     
         6 . The oil pump control system  claim 2 , wherein the controller monitors whether the oil sensor and the oil pressure adjustment valve are normal or not, and
 when functions of the oil sensor and the oil pressure adjustment valve are normal as a result of monitoring, the controller performs a first mode in which the controller determines a first target oil pressure value based on the engine RPM and the oil pressure, and controls the oil pressure adjustment valve such that a monitored oil pressure follows a determined first target oil pressure value.   
     
     
         7 . The oil pump control system of  claim 6 , wherein, when an oil temperature sensing function of the oil sensor is abnormal as a result of monitoring, the controller performs a second mode in which the controller determines a second target oil pressure value based on the engine RPM, and controls the oil pressure adjustment valve such that the monitored oil pressure follows a determined second target oil pressure valve. 
     
     
         8 . The oil pump control system of  claim 7 , wherein, when at least one of an oil pressure sensing function of the oil sensor and the function of the oil pressure adjustment valve is abnormal as a result of monitoring, the controller performs a third mode in which the controller deactivates a control function for the oil pressure adjustment valve. 
     
     
         9 . The oil pump control system of  claim 8 , wherein the oil pump operates as a mechanical variable oil pump. 
     
     
         10 . The oil pump control system of  claim 1 , wherein the target oil pressure value is determined by a first map in which the target oil pressure value is predetermined for the engine RPM and the oil temperature. 
     
     
         11 . The oil pump control system of  claim 10 , wherein the target oil pressure value of the first map is decided by linear interpolation. 
     
     
         12 . The oil pump control system of  claim 1 , wherein the oil sensor is constructed to have both of an oil pressure sensing function and an oil temperature sensing function or have any one of the oil pressure sensing function and the oil temperature sensing function. 
     
     
         13 . An operation method of an oil pump control system for a vehicle, which includes an oil pump to form a pressure for supplying oil to an engine and an oil pressure adjustment valve connected to the oil pump to control a pressure of the oil supplied to the engine by controlling the pressure formed by the oil pump, the operation method comprising:
 monitoring a vehicle information inputted from outside and an oil pressure and an oil temperature sensed by an oil sensor;   determining a target oil pressure value based on an engine RPM of a monitored vehicle information and the oil temperature, and controlling the oil pressure adjustment valve such that a monitored oil pressure follows a determined target oil pressure value.   
     
     
         14 . The operation method of  claim 13 , further including:
 monitoring whether the oil sensor and the oil pressure adjustment valve are normal or not; and   when functions of the oil sensor and the oil pressure adjustment valve are normal as a result of monitoring, performing a first mode in which a first target oil pressure value is determined based on the engine RPM and the oil temperature and the oil pressure adjustment valve is controlled such that the monitored oil pressure follows a determined first target oil pressure value.   
     
     
         15 . The operation method of  claim 14 , further including, when an oil temperature sensing function of the oil sensor is abnormal as a result of monitoring, performing a second mode in which a second target oil pressure value is determined based on the engine RPM and the oil pressure adjustment valve is controlled such that the monitored oil pressure follows a determined second target oil pressure value. 
     
     
         16 . The operation method of  claim 14 , further including, when at least one of an oil pressure sensing function of the oil sensor and the function of the oil pressure adjustment valve is abnormal as a result of monitoring, performing a third mode in which a control function for the oil pressure adjustment valve is deactivated. 
     
     
         17 . The operation method of  claim 13 , wherein the oil pump includes a first chamber connected to an oil pump outlet fluid-communicating to the engine and a second chamber connected to the oil adjustment valve, wherein an internal pressure of the second chamber is controlled by the oil pressure adjustment valve. 
     
     
         18 . The operation method of  claim 14 , wherein the oil pump includes a first chamber connected to an oil pump outlet fluid-communicating to the engine and a second chamber connected to the oil adjustment valve, wherein an internal pressure of the second chamber is controlled by the oil pressure adjustment valve. 
     
     
         19 . The operation method of  claim 18 , wherein the oil pressure adjustment valve includes a three-port two-way solenoid valve having a P port connected to a first branch diverging from the oil pump outlet, an A port connected to the second chamber, and a T port connected to an oil pan. 
     
     
         20 . The operation method of  claim 18 , wherein the oil pressure adjustment valve includes a three-port two-way solenoid valve having a P port connected to a second branch diverging from a main gallery connected to the first chamber, an A port connected to the second chamber, and a T port connected to an oil pan.