A variable stroke free piston engine

A piston engine and engine technology, applied in the direction of free piston engine, internal combustion piston engine, combustion engine, etc., can solve the problems of increased engine weight and cost, low controllability, high difficulty in design and production, and achieve good fuel economy and Power, variable compression ratio, and high utilization

CN107701305BActive Publication Date: 2019-12-27江苏铱莱德驱动系统有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-12-27

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Abstract

The invention discloses a stroke-variable free piston engine. The engine comprises a combustion chamber part, a spring chamber part, a permanent magnet linear motor part and an electronic control unitpart. A cam-free variable valve timing manner is adopted, and fully-flexible control over an inlet valve and an exhaust valve is achieved by electromagnetically driving a valve timing mechanism; an electronic control unit controls displacement of a piston by adjusting the powering-on current magnitude and direction of a permanent magnet linear motor coil, and the upper stop point, the lower stoppoint and the compression ratio of the piston are variable; and real-time control over the valve starting moment, the valve lift curve and the valve timing duration time is achieved by changing a control signal of the cam-free variable valve timing mechanism. The stroke-variable free piston engine is simple in structure and high in efficiency, fully-flexible control over various execution mechanisms of the engine is achieved, and the energy saving and environment protection performance of the engine is improved.
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Description

technical field

[0001] The invention relates to the technical field of vehicle engines, in particular to a variable stroke free piston engine. Background technique

[0002] Reciprocating cycle engines are divided into two-stroke engines and four-stroke engines according to the number of strokes in one working cycle. A working cycle of a two-stroke internal combustion engine is divided into two strokes, the first stroke piston moves from bottom dead center to top dead center to complete intake and compression, and the second stroke piston moves from top dead center to bottom dead center to complete work and discharge Gas, a working cycle is completed. A working cycle of a four-stroke internal combustion engine is divided into four strokes. The first stroke piston moves from top dead center to bottom dead center to complete intake air, the second stroke piston moves from bottom dead center to top dead center to complete compression, and the third stroke The piston moves from...

Examples

Embodiment 1

[0029] to combine figure 1 , a variable-stroke free-piston engine of the present invention includes four parts: a combustion chamber part, a spring chamber part, a permanent magnet linear motor part and an electronic control unit part.

[0030] in:

[0031] The combustion chamber part includes a variable valve mechanism 1, an engine cylinder head 2, an engine block 5, a piston 4 and a spark plug 3, wherein the variable valve mechanism 1 changes the valve lift, valve opening time, The valve opening duration realizes the fully flexible control of engine air distribution; the upper and lower dead centers of the piston 4 are variable, and the compression ratio is variable;

[0032] The spring chamber part includes a spring 7 and a bracket 8, wherein the spring 7 is fixed between the engine piston 4 and the linear motor. When the piston 4 goes down, the spring 7 is compressed to limit the displacement of the piston 4 and store energy. When the piston 4 goes up, the spring 7 provid...