Full-variable electro-hydraulic valve system

Abstract

The invention discloses a full-variable electro-hydraulic valve system. The system comprises a sliding sleeve, a sliding shaft, a piston and a reset spring; the sliding sleeve is fixed relative to anengine, the piston abuts against a valve assembly, and the sliding shaft is axially controlled by a cam surface of a camshaft; the sliding shaft is provided with a limiting oil hole which communicateswith a sliding sleeve cavity, the inner hole wall of the sliding sleeve is provided with a spiral groove, the spiral groove communicates with an oil through hole, and when the spiral groove communicates with the limiting oil hole, the sliding sleeve cavity communicates with a low-pressure oil way of the engine for pressure relief; and an axial protruding part of the sliding shaft is provided witha sliding shaft abutting plane, and the head part of an axial protruding part of the piston is provided with a piston abutting plane. The system solves the problem that the normal operation of the system is influenced due to oil loss in the sliding sleeve cavity, keeps a crank angle corresponding to the valve opening time unchanged, and is particularly suitable for controlling the variable strokeof an intake valve of the engine with a scavenging process.

Description

technical field [0001] The invention relates to the technical field of engine valve mechanism, in particular to a fully variable electro-hydraulic valve system. Background technique [0002] Fully Variable Valve System (FVVS for short) can realize the continuous variable of the maximum valve lift, valve opening duration angle and valve timing, which is of great significance to the energy saving and emission reduction of the engine. FVVS can control the amount of working fluid entering the cylinder by means of early intake valve closing (EIVC), thereby canceling the throttle valve. This throttleless gasoline engine will greatly reduce the pumping loss and reduce the fuel consumption under small and medium loads. 10-15%. The fully variable valve mechanism is matched with supercharging and intercooling, which can solve the problems of engine deflagration and high heat load after supercharging, realize low-temperature combustion under the premise of greatly increasing the avera...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned shortcomings of the prior art, the present invention provides a fully variable electro-hydraulic valve system to solve the problem that the normal operation of the system is affected by the loss of oil in the sliding sleeve cavity, and to make the crank angle corresponding to the opening moment of the valve constant

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