# US 2019/0170031 A1 · System and method for controlling variable oil pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170031 A1 - Document ID: US20190170031A1 - Status: Published application - Kind: A1 - Application number: 16/161,259 - Filed: 2018-10-16 - Published: 2019-06-06 - Earliest claimed: 2017-12-05 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Yonggyu Lee; Ho Sung Nam - Web page: https://patentgrep.com/patent/US20190170031A1 ## CPC - F01M 1/16: Controlling lubricant pressure or quantity (rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22) - F01M 1/02: using lubricating pumps (pumps in general F04; lubricating pumps per se F16N) - F16N 13/20: Rotary pumps (with distributing equipment F16N13/22) - F01M 2001/0238: {Rotary pumps} - F01M 2001/0246: {Adjustable pumps} - F16N 2210/04: Vehicles - F16N 2270/60: Pressure - F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING - F16N: LUBRICATING ## Abstract A system for controlling a variable oil pump is provided. The system includes a variable oil pump that varies a discharge pressure of oil and an actuator that is operated to vary the discharge pressure of the oil of the variable oil pump. A controller turns the actuator on or off based a relationship between an outdoor temperature and a cooling water temperature of an engine. ## Claims ### Claim 1 A system for controlling a variable oil pump, comprising: a variable oil pump configured to vary a discharge pressure of oil; an actuator operated to vary the discharge pressure of the oil of the variable oil pump; and a controller configured to operate the actuator to turn on or off, wherein the controller is configured to execute a control logic of turning on the actuator based on an entry hysteresis line in which the actuator is turned on according to an increase in a cooling water temperature of an engine, based on an outdoor temperature, and wherein the controller is configured to execute a control logic of turning off the actuator based on an escape hysteresis line in which the actuator is turned off according to a decrease in the cooling water temperature of the engine, based on the outdoor temperature. ### Claim 2 (depends on 1) The system of claim 1, wherein the entry hysteresis line according to an outdoor temperature is set to be greater than the escape hysteresis line according to an outdoor temperature. ### Claim 3 (depends on 2) The system of claim 2, wherein in a first region in which the outdoor temperature is equal to or less than a predetermined first outdoor temperature, the entry hysteresis line and the escape hysteresis line have predetermined values. ### Claim 4 (depends on 2) The system of claim 2, wherein in a second region between the first outdoor temperature and a second outdoor temperature greater than the first outdoor temperature, the entry hysteresis line and the escape hysteresis line lower according to an increase in the outdoor temperature. ### Claim 5 (depends on 2) The system of claim 2, wherein in a third region in which the outdoor temperature is greater than the second outdoor temperature, the entry hysteresis line and the escape hysteresis line lower according to an increase in the outdoor temperature. ### Claim 6 (depends on 2) The system of claim 2, wherein a hysteresis region is formed between the entry hysteresis line and the escape hysteresis line. ### Claim 7 A system for controlling a variable oil pump, comprising: a variable oil pump configured to vary a discharge pressure of oil; an actuator operated to vary the discharge pressure of the oil of the variable oil pump; and a controller configured to turn the actuator on or off, wherein the controller is configured to execute a logic of turning on or off the actuator according to an outdoor temperature and a cooling water temperature of an engine. ### Claim 8 (depends on 7) The system of claim 7, wherein in a first region in which the outdoor temperature is equal to or less than a predetermined first outdoor temperature, an entry hysteresis line in which the actuator is turned on according to an increase in the cooling water temperature is constant. ### Claim 9 (depends on 8) The system of claim 8, wherein in the first region in which the outdoor temperature is equal to or less than the predetermined first outdoor temperature, an escape hysteresis line in which the actuator is turned off according to a decrease in the cooling water temperature is constant. ### Claim 10 (depends on 9) The system of claim 9, wherein at any one point of the outdoor temperature, the cooling water temperature corresponding to the escape hysteresis line is less than the cooling water temperature corresponding to the entry hysteresis line. ### Claim 11 (depends on 7) The system of claim 7, wherein in a second region between a predetermined first outdoor temperature and a second outdoor temperature greater than the first outdoor temperature, an entry hysteresis line in which the actuator is turned on according to an increase in the cooling water temperature rises according to a decrease in the outdoor temperature. ### Claim 12 (depends on 11) The system of claim 11, wherein an escape hysteresis line in which the actuator is turned off according to a decrease in the cooling water temperature rises according to a decrease in the outdoor temperature. ### Claim 13 (depends on 12) The system of claim 12, wherein at one point of the outdoor temperature, a cooling water temperature corresponding to one point of the escape hysteresis line is less than a cooling water temperature corresponding to at one point of the entry hysteresis line. ### Claim 14 (depends on 7) The system of claim 7, wherein in a third region in which the outdoor temperature is equal to or less than a predetermined second outdoor temperature, an entry hysteresis line in which the actuator is turned on according to an increase in the cooling water temperature rises according to a decrease in the outdoor temperature. ### Claim 15 (depends on 14) The system of claim 14, wherein an escape hysteresis line in which the actuator is turned off according to a decrease in the cooling water temperature rises according to a decrease in the outdoor temperature. ### Claim 16 (depends on 15) The system of claim 15, wherein at one point of the outdoor temperature, the cooling water temperature corresponding to the escape hysteresis line is less than the cooling water temperature corresponding to the entry hysteresis line. ### Claim 17 A method for controlling a variable oil pump, comprising: turning, by a controller, an actuator on or off, wherein the actuator is operated to vary a discharge pressure of oil in a variable oil pump; executing, by the controller, a control logic of turning on the actuator based on an entry hysteresis line in which the actuator is turned on according to an increase in a cooling water temperature of an engine, based on an outdoor temperature; and executing, by the controller, a control logic of turning off the actuator based on an escape hysteresis line in which the actuator is turned off according to a decrease in the cooling water temperature of the engine, based on the outdoor temperature. ### Claim 18 (depends on 17) The method of claim 17, wherein the entry hysteresis line according to an outdoor temperature is set to be greater than the escape hysteresis line according to an outdoor temperature. ### Claim 19 (depends on 18) The method of claim 18, wherein in a first region in which the outdoor temperature is equal to or less than a predetermined first outdoor temperature, the entry hysteresis line and the escape hysteresis line have predetermined values. ### Claim 20 (depends on 18) The method of claim 18, wherein in a second region between the first outdoor temperature and a second outdoor temperature greater than the first outdoor temperature, the entry hysteresis line and the escape hysteresis line lower according to an increase in the outdoor temperature.