Camless electrohydraulic variable valve timing system based on fuel medium

Abstract

The invention aims to provide a camless electrohydraulic variable valve timing system based on a fuel medium, comprising an oil tank, a filter, a high pressure oil pump, a fuel rail, a pressure sensor, a flow regulating valve, an electromagnetic valve and a valve timing rail, wherein the oil tank is connected with the high pressure oil pump via the filter; the high pressure oil pump is connected with the valve timing rail and the fuel rail; the pressure sensor and the flow regulating valve are fixed on the valve timing rail and the fuel rail; and the electromagnetic valve is connected with the valve timing rail. The system in the invention can reduce oil lines, lower arrangement difficulty, omit valve timing parts such as a camshaft, a tappet, a handspike, a rocker and the like, maintain the original cylinder cover structure, and reduce design complexity. The electronic control high pressure common rail injecting technology is fused with the control of parameters such as valve timing angle, valve life, valve open duration and the like, and a high pressure storage is fully utilized to reduce pressure fluctuation of high pressure oil driving the valve to be open.

Description

technical field [0001] The invention relates to the field of engine intake and exhaust, in particular to a variable valve timing system of the engine. Background technique [0002] Energy shortages and increasingly stringent environmental protection regulations have made VVT ​​(Variable Valve Timing) move from laboratory research to a practical stage. BMW, Honda, Toyota, Nissan and other world-renowned automobile manufacturers have proposed typical models. The variable valve timing system has been well applied in the real machine. At present, the variable valve timing system that can be maturely applied to vehicle engines still does not get rid of the limitation of the camshaft, and can only realize variable valve timing and lift within a certain range. For this reason, researchers turned their attention to the camless variable valve timing system, and various variable valve timing forms such as electromagnetic, electro-hydraulic, and electric have appeared successively. A...

AI Technical Summary

Problems solved by technology

However, due to the influence of various factors such as energy consumption, impact, and application space, the current research on the electro-hydraulic variable valve timing system is mainly aimed at low-speed marine engines, and has not been properly installed on vehicle diesel engines.

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