Electro-hydraulic variable valve system with one-way throttle valves with buffering effect

Abstract

The invention discloses an electro-hydraulic variable valve system with one-way throttle valves with the buffering effect. The electro-hydraulic variable valve system comprises an engine valve executing mechanism, a high-pressure liquid source and a hydraulic drive control system; the high-pressure liquid source is composed of oil tanks, an oil pump, a motor, a filter, an overflow valve, a one-way valve and an energy accumulator and provides hydraulic oil with stable oil pressure for the hydraulic drive control system; the hydraulic drive control system is composed of a three-position four-way solenoid valve, the one-way throttle valves and an electronic control unit, and opening and falling of a valve can be realized by controlling reversing of the three-position four-way solenoid valve; by controlling the throttling parameters of the one-way throttle valves, the flow of a hydraulic system can be reduced, the motion speed of a piston rod can be lowered, and the opening process and the falling process of the valve can be buffered; and finally the motion characteristic of accelerated opening-decelerated opening-opening maintaining-accelerated falling-slow falling-stable settling down of the valve can be realized.

Description

technical field [0001] The invention belongs to the field of engine valve devices, in particular to an electro-hydraulic variable valve system with one-way throttle buffer. Background technique [0002] The internal combustion engine is the prime mover with the highest thermal efficiency and the largest power per unit volume and unit weight, and is widely used. However, with the depletion of fossil energy in the world and the continuous deterioration of environmental resources, internal combustion engines need to meet more stringent emission regulations and fuel consumption requirements. Traditional internal combustion engines use fixed-profile cam-driven valves, which cannot guarantee the best emission and fuel consumption of internal combustion engines at all operating points. Therefore, most new internal combustion engines use variable valve technology to optimize emissions and reduce fuel consumption. [0003] Variable valve technology is mainly divided into cam-based v...

AI Technical Summary

Problems solved by technology

However, the camless gas distribution technology driven by electro-hydraulic has the defects of high speed and large impact when the valve reaches the maximum lift and seat, so it is necessary to design a buffer mechanism

Common buffering schemes include spring buffering and damping hole buffering, but the response speed of spring buffering is slow, and damping holes, especially small-sized damping holes, are difficult to process, so the electro-hydraulic variable valve system with reliable buffering effect is the future research direction

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