SYSTEM AND METHOD FOR CONTROLLING OIL PUMP

• US 20140100739A1
• Filed: 12/07/2012
• Published: 04/10/2014
• Est. Priority Date: 10/04/2012
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: LEE, Sungha
• Granted Patent: US 9,031,741 B2
• Time in Patent Office: Days
• US Class Current: 701/36
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: F01M 1/16 Controlling lubricant pressure or quantity rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22
• CPC Class Codes: F01M 2250/64 Number of revolutions

Abstract

Disclosed are an oil pump control system and method, the oil pump control method including setting an initial target oil pressure of the oil pump based on a rotation speed of an engine or an oil temperature, determining a pressure compensation value by considering the target torque or target fuel quantity of the engine based on the initial target oil pressure, determining a final target oil pressure by adding the pressure compensation value to the initial target oil pressure, and feedback-controlling the oil pump so that current oil pressure measured in real time follows the final target oil pressure.

Claims

9. An oil pressure control system for controlling oil pressure of an electronic oil pump, comprising:

an engine rotation speed sensor configured to measure a rotation speed of an engine;

an oil temperature sensor configured to measure an oil temperature;

an oil pressure sensor configured to detect current oil pressure of the electronic oil pump; and

a control unit configured to control the electronic oil pump based on information of the engine rotation speed, the oil temperature, and the oil pressure transmitted from the engine rotation speed sensor, the oil temperature sensor, and the oil pressure sensor,

wherein the control unit controls the electronic oil pump by setting an initial target oil pressure of the electronic oil pump based on the rotation speed or the oil temperature;

determining a target torque or a target fuel quantity of the engine;

determining a pressure compensation value by considering the determined target torque or target fuel quantity of the engine based on the initial target oil pressure;

determining a final target oil pressure by adding the pressure compensation value to the initial target oil pressure; and

feedback-controlling the electronic oil pump so that current oil pressure measured in real time follows the final target oil pressure.

1. An oil pump control method, comprising:

setting an initial target oil pressure of an oil pump based on a rotation speed of an engine or an oil temperature;

determining a target torque or a target fuel quantity of the engine;

determining a pressure compensation value by considering the determined target torque or target fuel quantity of the engine based on the initial target oil pressure;

determining a final target oil pressure by adding the pressure compensation value to the initial target oil pressure; and

feedback-controlling the oil pump so that current oil pressure measured in real time follows the final target oil pressure.

2. The oil pump control method of claim 1, wherein:

the initial target oil pressure is set from a target oil pressure curve preset according to the rotation speed of the engine or a target oil pressure map preset according to the rotation speed of the engine and the oil temperature.

3. The oil pump control method of claim 2, further comprising:

determining whether the oil temperature is normally measured; and

when the oil temperature is not normally measured, setting the determined target oil pressure as the final target oil pressure according to the target oil pressure curve.

4. The oil pump control method of claim 1, wherein:

the determining of the pressure compensation value comprises;

determining an absolute value of a difference between a first target oil pressure determined from the target oil pressure curve and a second target oil pressure determined from the target oil pressure map;

determining a pressure compensation factor from the target torque of the engine or the target fuel quantity of the engine; and

determining the pressure compensation value by multiplying the absolute value by the pressure compensation factor.

5. The oil pump control method of claim 4, wherein:

the pressure compensation factor is determined from a torque-based compensation factor map preset according to the target torque of the engine and the rotation speed of the engine.

6. The oil pump control method of claim 5, wherein:

the torque-based compensation factor map is preset so that the final target oil pressure has a value equal to or larger than that of the second target oil pressure and equal to or smaller than that of the first target oil pressure.

7. The oil pump control method of claim 4, wherein:

the pressure compensation factor is determined from a fuel quantity-based compensation factor map preset according to the target fuel quantity of the engine and the rotation speed of the engine.

8. The oil pump control method of claim 7, wherein:

the fuel quantity-based compensation factor map is preset so that the final target oil pressure has a value equal to or larger than that of the second target oil pressure and equal to or smaller than that of the first target oil pressure.

10. The oil pressure control system of claim 9, wherein the initial target oil pressure is set from a target oil pressure curve preset according to the rotation speed of the engine or a target oil pressure map preset according to the rotation speed of the engine and the oil temperature.

11. The oil pump control method of claim 10, wherein the control unit determines whether the oil temperature is normally measured, and when the oil temperature is not normally measured, sets the determined target oil pressure as the final target oil pressure according to the target oil pressure curve.

12. The oil pump control method of claim 9, Wherein the control unit determines the pressure compensation value by:

determining an absolute value of a difference between a first target oil pressure determined from the target oil pressure curve and a second target oil pressure determined from the target oil pressure map;

determining a pressure compensation factor from the target torque of the engine or the target fuel quantity of the engine; and

determining the pressure compensation value by multiplying the absolute value by the pressure compensation factor.

13. The oil pump control method of claim 12, wherein the pressure compensation factor is determined from a torque-based compensation factor map preset according to the target torque of the engine and the rotation speed of the engine.

14. The oil pump control method of claim 13, wherein the torque-based compensation factor map is preset so that the final target oil pressure has a value equal to or larger than that of the second target oil pressure and equal to or smaller than that of the first target oil pressure.

15. The oil pump control method of claim 14, wherein the fuel quantity-based compensation factor map is preset so that the final target oil pressure has a value equal to or larger than that of the second target oil pressure and equal to or smaller than that of the first target oil pressure.

16. The oil pressure control system of claim 9, wherein the control unit controls pressure of the oil pump by controlling a solenoid valve connected to the oil pump.

14-1. The oil pump control method of claim 12, wherein the pressure compensation factor is determined from a fuel quantity-based compensation factor map preset according to the target fuel quantity of the engine and the rotation speed of the engine.