A continuously variable valve drive device and its control method

Abstract

The invention discloses a continuously changeable air valve driving device which comprises a first cam, a second cam, a swing arm, a connection rod and a driving mechanism, wherein the first cam is fixed on a cam shaft; the second cam can rotate around a fixed axial line; the working surface at the bottom of the second cam is matched with an air valve tappet to drive an air valve ejector pin to move; the swing arm is arranged on an eccentric shaft in a sleeving manner to rotate around the eccentric shaft; one end of the connection rod is hinged with the swing arm, and the other end of the connection rod presses against the upper part of the second cam; the first cam is in contact with the middle part of the connection rod; and the driving mechanism can drive the eccentric shaft to rotate around an eccentric axial line to change the central position of the eccentric shaft. Compared with an existing continuously changeable air valve mechanism, the continuously changeable air valve driving device is relatively simple in structure and high in stability, can be conveniently assembled in an engine to realize continuous control over the lift of an air valve and the open time, and can guarantee high power transmission speed, improve the overall rigidity of the system and increase the fixed frequency of the system. The invention further provides a control method of the continuously changeable air valve driving device.

Description

technical field [0001] The invention belongs to the technical field of automobile engine valves, in particular to a continuously variable valve driving device and a control method thereof. Background technique [0002] The traditional engine valve mechanism is designed with valve lift and valve open time as fixed values, which are generally determined based on the local optimization of a narrow engine working range, taking into account the stability of the engine at low speed and the dynamic performance at high speed, and the valve movement The law is completely determined by the cam profile, which can only ensure that the engine is in the best gas distribution state at a certain speed. However, the traditional gasoline engine has a single cam profile and cannot adjust the intake air volume according to the engine load. The valve operating parameters of the traditional engine valve train are also fixed, and the determination of the parameters depends on the designed operati...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the existing variable valve lift cannot be continuously variable, and to provide a continuously variable valve drive device, which can realize flexible and adjustable valve lift and continuous opening time of the valve.

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