A method and device for realizing cylinder deactivation

Abstract

The invention relates to a method and device of achieving cylinder stopping. A cam shaft corresponding to the cylinder stopping air cylinder is provided with a sliding type sleeve which is arranged with a high-low lift cam and a low lift cam are connected with the sliding type sleeve in a sliding mode, the outer surface of the sliding sleeve is further provided with an axial offset distance guidegroove, and stretchable push rods cooperate with guide grooves can be in contact with in an abut against mode or separated from each other; when the air cylinder works normally, the high-lift cam cooperates with a hydraulic rocker arm to work in a valve opening state; when the cylinder stopping is started, the push rods guided by the guide grooves and push the sliding type sleeve to enable the high-lift cam to form switching to the low-lift cam, the original basic structure and the method of the device are kept unchanged, working and switching types of controlling are formed by controlling theguide grooves and the push rods so as to realize the cylinder stopping through the variable valve lift.

Description

technical field [0001] The invention relates to a method and device for realizing cylinder deactivation. Background technique [0002] The vehicle engine has a wide range of work, and the fuel economy is better when the load is large, and the fuel economy is poor when the load is small or medium. It is difficult for a fixed-displacement engine to give consideration to high-speed dynamics and low-speed fuel economy at the same time. In general, in order to ensure vehicle dynamics and environmental adaptability, the displacement of the engine will be selected appropriately larger; however, in daily life, vehicles often run at low speeds (urban areas, red lights, etc.), and the engine runs at a low load state at this time. Fuel economy deteriorates. [0003] Cylinder deactivation technology can effectively solve this contradictory problem. Cylinder deactivation technology, also known as variable cylinder displacement technology, refers to that when the engine is running at p...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the structure of the two-stage rocker arm is complex and requires more layout space. Under the layout structure of the original engine cylinder head valve system, it is basically difficult to realize the function of deactivating the cylinder through minor changes; the two-stage rocker arm structure controls the pin The connection and detachment of the cylinder need to be realized by a certain oil pressure. In order to ensure that the process is completed in a short time, sufficient oil pressure is required. Therefore, it is necessary to appropriately increase the amount of oil applied to the hydraulic tappet. The original oil circuit layout of the cylinder head needs to be Re-adjust; when the engine is deactivated, the auxiliary cam on the camshaft is in contact with the edges on both sides of the secondary rocker arm. Due to the small contact area, long-term contact and mutual movement at this place will cause wear of the parts, and a separate oil Lubricate the place

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