Control method based on electromagnetic braking system of fast compressor

Abstract

The invention relates to a control method based on an electromagnetic braking system of a fast compressor. The applicative electromagnetic braking system of the fast compressor comprises a central control unit, a braking cylinder made of a magnetic separation material, a pushing rod penetrating through the braking cylinder, an electromagnetic braking circular ring fixed to the braking cylinder, anelectromagnetic braking piston fixed to the pushing rod, a first light shading plate, a second shading plate, a photoelectric sensor and an electromagnetic braking control circuit, wherein the firstlight shading plate and the second shading plate are fixed to the pushing rod, and the photoelectric sensor is fixed nearby the pushing rod. The control method comprises the following steps that the braking distance l is estimated preliminarily according to the magnitude of a current capable of being provided, electromagnetic force between two electromagnetic coils and the initial velocity v of apushing rod combination during braking, a small part of restore distance delta l is still formed between the piston and an upper stop point after braking is completed, the electromagnetic braking piston and the electromagnetic braking circular ring are further fastened, the two second shading plates and the photoelectric sensor are mounted, and when braking is started, the distance between the twoelectromagnetic coils meets the formula of L=l+delta l.

Description

technical field [0001] The present invention is a control method based on a rapid compressor electromagnetic braking system, which relates to the technical field of engines, in particular to a rapid compressor braking system for engine simulation. Background technique [0002] Fast compressor is a basic experimental platform for simulating engine compression and combustion process. It uses external force to carry out the compression stroke, quickly moves the piston to the top dead center, compresses the gas in the cylinder, and then uses the braking system to stop the piston, so that the gas in the cylinder is burned at high temperature and high pressure, simulating the single combustion process of the engine. By studying the combustion process of the fast compressor, the combustion situation in the cylinder when the engine runs to the top dead center can be obtained indirectly. Compared with the engine, the fast compressor has a simple structure, which can temporarily aban...

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Problems solved by technology

But this approach has some drawbacks

For example, hydraulic braking often causes the phenomenon of piston rebound, which changes the thermodynamic state in the cylinder, affects the spontaneous combustion delay period of the fuel, the combustion phase in the cylinder, and other processes, thus causing deviations in the experimental results

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