Piezoelectric stepless variable valve mechanism based on inverse piezoelectric effect

Abstract

The invention discloses a novel piezoelectric stepless variable valve mechanism based on the inverse piezoelectric effect, which mainly includes a potential converter, a stroke amplifier, an oil filling device, a valve device and the like. Theoretically, the input of any voltage signal profile can be realized based on the single-chip program control, so as to realize the valve lift curve of any shape. Therefore, various valve motion parameters such as valve timing, valve lift, and valve profile can be independently controlled Flexible controls. When the invention is applied to the intake valve, the compression ratio of the internal combustion engine can be continuously variable, and when it is applied to the exhaust valve, the expansion ratio can be continuously variable; through the optimization of the compression ratio and the expansion ratio, the compression work can be reduced while Increase the expansion work and improve the thermal efficiency of the internal combustion engine. The invention solves the inherent defects of the traditional purely mechanical, hydraulic and electromagnetic variable valve mechanism, and has the characteristics of independent and flexible control, simple structure and low manufacturing cost.

Description

technical field [0001] The invention relates to a gas distribution mechanism of an internal combustion engine, in particular to a piezoelectric infinitely variable valve mechanism. Background technique [0002] With the rapid increase of car ownership, the environmental problems and energy problems brought by cars are becoming more and more serious. Countries have successively enacted stricter emission regulations, which have promoted the development of efficient and clean combustion technology for internal combustion engines, and intake and exhaust control technology is the basis for achieving efficient and clean combustion. The variable valve timing and lift technology of internal combustion engine is an effective method to realize the phase control of intake and exhaust. The variable valve technology can realize the best use of intake inertia under different working conditions and reduce the loss of exhaust push work, so it can increase the charge coefficient, increase t...

AI Technical Summary

Problems solved by technology

The electromagnetic variable valve technology can mainly control the energization time of the two electromagnetic poles to realize the variable valve. Its structure is simple, and it can realize the independent control of the valve timing, maximum lift and lift curve at the same time, but the impact when the valve is seated is relatively large. , the reliability of the engine and the life of the valve are reduced, and the energy consumption is higher

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