Continuous variable valve lift system control method and system and vehicle

Abstract

The invention provides a continuous variable valve lift system control method and system and a vehicle. The method includes the following steps that S1, valve lifts of all air cylinders of an engine are controlled according to a minimum valve lift target value; S2, actual valve lift values of all air cylinders of the engine are detected; S3, whether the actual valve lift values of all air cylinders of the engine are within the minimum valve lift target interval or not is judged; and S4, if the actual valve lift values of all air cylinders of the engine are not within the minimum valve lift target interval, the angles of corresponding eccentric gears are adjusted until the actual valve lift values of all air cylinders of the engine are within the minimum valve lift target interval. By means of the method, consistency of the valve lifts of all air cylinders of an internal combustion engine can be guaranteed, and influences of machining tolerance of parts in the system, the fit clearance of the parts and deformation of the parts on the valve lifts are avoided.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a control method, system and vehicle of a continuously variable valve lift system. Background technique [0002] Energy and environmental issues are the most severe challenges faced by human beings in the 21st century. As the power machinery with the highest thermal efficiency and the most widely used at present, the internal combustion engine generates 90% of the total power of power plants used in the world. It is the world's petroleum energy. main consumption channel. With the increase of car ownership, the oil consumption of internal combustion engines will increase rapidly, and the contradiction between oil supply and demand will inevitably become increasingly serious. While consuming a large amount of energy, internal combustion engines are also the biggest source of pollution to the atmospheric environment, especially the urban atmospheric environment. This shows that ...

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Problems solved by technology

[0005] However, the variable valve lift mechanical mechanism is complex, and the clearance between the various kinematic pairs in the variable valve lift system, as well as the various parts in the system will deform to varying degrees under different loads of the engine. Both will affect the valve lift, so that the valve lift of each cylinder will be different

[0006] In addition, the traditional non-continuously variable valve lift structure has a single lift method, which cannot realize continuous change of valve lift under most engine operating conditions, and cannot guarantee optimal valve lift matching

However, the current continuously variable valve lift technology inevitably produces a lift difference due to the system fit clearance and the deformation of each component, which in turn will affect the consistency of the valve lift.

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