A three-stage or four-stage variable displacement oil pump based on a double-switch solenoid valve

Abstract

A three-stage or four-stage variable displacement engine oil pump based on two switch solenoid valves uses a structure of two variable feedback cavities. One variable feedback cavity is directly connected to a pump outlet, and the other variable feedback cavity is controlled by a pressure control valve. The control valve includes two independent control cavities that are both in communication with a main oil gallery and are each controlled by a switch solenoid valve. The two switch solenoid valves are in four different combined states: off and off, on and off, off and on, and on and on, so that the pressure control valve has four different pressure control modes, and an engine oil pump correspondingly forms four different pressure control modes, which can meet pressure requirements of various different working conditions of an engine, to realize a pressure control target that is very close to actual requirements of the engine; power saving of the pump is very close to that of a continuously variable displacement engine oil pump controlled by an electro-hydraulic proportional valve, and the control modes in the present invention are logically simple and reliable, fast in response, and stable in pressure control, and have a small pressure fluctuation.

Description

technical field [0001] The invention relates to the technical field of lubricating systems of internal combustion engines, in particular to a multi-stage variable displacement lubricating oil pump. Background technique [0002] With the increasing development of automobile energy saving and emission reduction technology, the variable displacement oil pump has been widely used in the internal combustion engine lubrication system. The valve controls the secondary variable with double-cavity feedback and the multi-stage variable displacement controlled by the electro-hydraulic proportional valve. The variable region of the primary variable overlaps less with the actual typical operating conditions of the engine, so the savings are limited. The two-stage variable-displacement oil pump controlled by the on-off solenoid valve performs low-pressure and high-pressure control respectively for different working conditions of the engine, and the energy-saving effect has been significa...

AI Technical Summary

Problems solved by technology

The response characteristics of the electro-hydraulic proportional valve, the contradiction between the pressure control accuracy and the stability and reliability of the pressure, at the same time, the matching of the electro-hydraulic proportional valve and the mechanical part of the oil pump, the matching of the engine control unit ECU and the oil pump assembly all increase the mechanical Difficulty in design and manufacture of oil pumps and complexity of calibration

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