Method for controlling output pressure of an engine oil pump
US6161515A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1999 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Jul 16, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01M1/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A lubrication system is provided, including a pressure control valve for regulating oil pressure in an internal combustion engine of a motor vehicle. An oil pump for circulating oil through the lubrication system is connected in flow communication with an engine lubrication circuit and a sump. A control valve in the oil pump is slidably movable in response to a control oil pressure. As oil pressure increases, the control valve functions to recirculate some of the oil back into the oil pump. By recirculating the oil, the control valve controls the flow of oil from the oil pump, and thereby regulating oil pressure in the lubrication system. During a cold engine start, the pressure control valve is actuated using a combined oil pressure, where a check valve is used to blend a first pressure prevailing at the outlet of said oil pump and a second pressure prevailing at or near the end of the lubrication circuit and. During warm engine operation, the check valve closes and prevents the blending of the oil pressure prevailing at the outlet of the oil pump. Thus, the pressure control valve is only actuated by oil pressure prevailing at or near the end of the lubrication circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.