Locking method for valve lift device

Abstract

The invention provides a locking method for a valve lift device. Within the first time when the rotation speed of an engine reaches the set value, the movement of a positioning plate is achieved through adjustment. When the rotation speed of the engine is increased and exceeds the set value or is reduced to the set value, electromagnetism work is achieved through adjustment. When the set value is exceeded, a piston ascends to the terminal point under the action of a pressure spring. At the terminal point, an electromagnetism power source is controlled to be turned off, a positioning spring pushes a positioning plate out so that the positioning plate can be combined with the piston, and the piston is positioned at the terminal position. When the set value is reached through lowering, a valve press disc downwards presses an inner spring, meanwhile, the piston is subjected to pressure of the inner spring, the pressure spring is pushed back to the original position, and the piston descends to the initial point. At the initial point, the electromagnetism power source is controlled to be turned off, the positioning spring pushes the positioning plate out so that the positioning plate and the piston can be combined, and the piston is positioned at the initial point position.

Description

technical field [0001] The invention relates to an internal combustion engine, in particular to a method for adjusting and locking the pressure of a valve inner spring according to the engine speed. Background technique [0002] The valve spring of the engine is the only part that guarantees the valve reset. If the valve spring force is too large, it will seriously damage the wear of the parts of the valve train. If the valve spring force is too small, the valve reset will lag behind, causing the valve and the power piston to collide. [0003] The return force of the valve spring is set according to the maximum speed of the engine to ensure the high-speed operation of the engine. However, the pressure of the valve spring at the highest speed is relatively large, which will inevitably affect the torque of the engine at low speeds. [0004] In order to achieve the reset speed of the valve in some high-speed engines, the valve spring adopts a double spring design, one inner s...

AI Technical Summary

Problems solved by technology

[0006] The invention proposes a valve adjustment system and method, which solves the problem of the spring pressure in the same valve with different engine speeds in the prior art

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