Continuous variable valve lift device and control method thereof

Abstract

The invention provides a continuous variable valve lift device applied to a valve control system of an internal combustion engine, and also relates to a control method of the continuous variable valvelift device. A rocker (1) of the continuous variable valve lift device is sheathed on a pivot (2), a roller (3) is contacted with the surface of the rocker (1) and connected with a sliding rod (5) bya pin roll (4) connected with the surface of the roller (3); one end of a control arm (7) is provided with a slideway (7a), the other end thereof is provided with a worm gear (7b); and the sliding rod (5) is sheathed with the slideway (7a) with a hollow structure, the worm gear (7b) has the structure with cogs and is connected with a worm (10), and the worm (10) is controlled by a stepping motor(11). The technical proposal has simple and compact structure, easy realization, low cost and high reliability, and can change the lift characteristic of the valve, with better flexibility.

Description

technical field [0001] The invention relates to a valve control system of an internal combustion engine, more specifically, a continuously variable valve lift device for mechanically changing the valve lift, and a control method for the continuously variable valve lift device. Background technique [0002] The research on engine variable valve drive technology has a history of more than 100 years. Since the late 1980s, global energy and environmental issues have become increasingly prominent, and countries have increasingly stringent requirements for improving fuel economy and reducing harmful emissions, so a large number of variable valve drive mechanisms have emerged as the times require. The variable valve lift technology can make the engine obtain good performance in the whole speed and load range. Most of the patents in this field are from Japan and the United States, and there are more and more engine products applying this technology, but most of the variable valve l...

AI Technical Summary

Problems solved by technology

Most of the patents related to this field are from Japan and the United States, and there are more and more engine products applying this technology, but most of the variable valve lift devices used in existing patents or products are two-stage variable lift, That is, the two states of high valve lift and low valve lift cannot meet the needs of the valve opening height under various engine working conditions

Most of the few existing valve lift continuously variable devices have complex structures, poor lubrication conditions, high manufacturing costs, and large assembly errors; Requirements for miniaturization of the engine and the layout of the engine in the vehicle; at the same time, because of the complexity of the mechanism, the noise generated will also be large

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