Variable stroke engine

Abstract

The invention relates to a variable stroke engine which comprises an air cylinder head, an air cylinder body and an electronic control unit, wherein the upper part of the air cylinder body is connected with the air cylinder head; a cam shaft is fixed on the rear side of an inner wall of the air cylinder head; a cam is mounted on the cam shaft in a sleeving manner; a combustion chamber is arranged at the lower part of the air cylinder head; the two sides of the combustion chamber are communicated with an overhead air inlet channel and an overhead air outlet channel respectively; the upper ends of overhead air inlet and outlet valves are connected with rocker arms respectively; the upper ends of the rocker arms are connected with a power switch device; a side air inlet channel and a side air outlet channel are formed on the left side and the right side of a piston; and the front side and the rear side of the piston are communicated with air sweeping channels respectively. According to the variable stroke engine, the available engine is not changed greatly; a contour line of the cam is not required to be changed; the transformation cost is low; the variable stroke engine has the advantages of four strokes and two strokes; the power performance and the emission performance of the engine are improved effectively; a stroke operation mode can be adjusted automatically according to different working conditions; and the variable stroke engine is wide in application scope.

Description

technical field [0001] The invention relates to the technical field of vehicle engines, in particular to a variable-stroke engine. Background technique [0002] Reciprocating cycle piston engines can be classified according to the number of strokes in one working cycle, the most common being two-stroke and four-stroke. In recent years, three-stroke, five-stroke, six-stroke and even eight-stroke have also appeared, but they are all only in the research stage and far from practical application. A cycle of a two-stroke engine includes two strokes, the upward behavior of the piston is the scavenging and compression stroke, and the downward behavior of the piston is the work and exhaust stroke. A cycle of a four-stroke engine includes four strokes, the first time the piston goes down for intake, up for compression, the second time down for work, and up for exhaust. [0003] Both engines have their own advantages and disadvantages. The two-stroke engine has a compact structure ...

AI Technical Summary

Problems solved by technology

Since the two and four strokes need to control the intake and exhaust through the valve, in addition to designing two sets of cam systems, a variable cam system is also required to realize the switching, which greatly increases the design and manufacturing costs; the use of overhead valves in the two In the stroke mode, it is difficult to ensure the ventilation effect. Due to the short ventilation time, it is easy to cause insufficient ventilation; the layout of the intake and exhaust passages and the intake passage need to be greatly improved, which increases the design cost and the commercial application prospect is not high. ;The matching switching control system is very complicated and the stability is not high

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