Three-level or four-level variable displacement machine oil pump based on double electromagnetic valves

Abstract

The invention provides a three-level or four-level variable displacement machine oil pump based on double switch electromagnetic valves. A dual-variable feedback cavity structure is adopted; one variable feedback cavity is directly connected with a pump outlet; the other variable feedback cavity is controlled by a pressure control valve; and the control valve comprises two independent control cavities which communicate with a main oil passage and are controlled by the switch electromagnetic valves. The two switch electromagnetic valves enable the pressure control valve to have four different pressure control modes under four different combined states which are off-off, on-off, off-on and on-on, and an oil pump correspondingly forms four different pressure control modes, so that pressure demands of an engine under different working conditions can be met, the aim of getting close to pressure control actually required by the engine is achieved, and power conservation of the three-level orfour-level variable displacement machine oil pump based on the double switch electromagnetic valves is close to power conservation of a continuous variable displacement machine oil pump controlled byadopting an electro-hydraulic proportional valve; and in addition, a control mode is simple and reliable in logic, the response is fast, the pressure control is stable, and the pressure fluctuation is small.

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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