Four-stroke internal combustion type hydraulic engine

Abstract

The invention provides a four-stroke internal combustion type hydraulic engine which comprises an internal combustion engine cylinder body, an intake and exhaust synchronous device arranged on the internal combustion engine cylinder body, a hydraulic pump assembly arranged in the internal combustion engine cylinder body, a piston assembly capable of being freely and movably mounted in the internal combustion engine cylinder body, as well as a sensor assembly for detecting the immediate running speed and position of the piston assembly, wherein the internal combustion engine cylinder body is formed by two groups of symmetrical cylinder heads and cylinders, and the cylinder heads are further provided with recoil start check valves; a hydraulic pump piston is integrated on an internal combustion engine piston; and the sensor assembly is mounted in a hydraulic pump steel drum. Compared with the traditional crankshaft piston internal combustion hydraulic engine, the four-stroke internal combustion type hydraulic engine has higher power density and work efficiency, and has smaller size, lighter weight and longer service life than the traditional engine, and particularly, a single engine has wide fuel adaptability and can use gasoline, diesel, aviation fuel, heavy oil, blended fuel, bio-fuel, gas fuel and the like only through a preset control grogram without changing the structure.

Description

Technical field [0001] The invention relates to a hydraulic engine, in particular to a four-stroke internal combustion type hydraulic engine. Background technique [0002] Hydraulic Free Piston Engine or Hydraulic Free Piston Engine (Hydraulic Free Piston Engine for short HFPE) is a composite engine that combines an internal combustion engine and a hydraulic pump, and uses liquid as an energy transmission medium. Hydraulic free piston engines have appeared, whether they are Single-piston, double-piston, or opposed-piston, the driving force is the two-stroke internal combustion engine structure; according to patent search and published information, only people have proposed the process principle of the free-piston four-stroke internal combustion (hydraulic) engine (the same The working principle of traditional four-stroke internal combustion engine is exactly the same, and the energy output method is the same as that of the existing two-stroke hydraulic free piston engine), but it...

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Problems solved by technology

[0002] Hydraulic Free Piston Engine or Hydraulic Free Piston Engine (HFPE for short) is a composite engine that combines an internal combustion engine and a hydraulic pump and uses liquid as an energy transmission medium. The hydraulic free piston engine that has appeared, whether it is Single-piston, double-piston, or opposed-piston, the driving force is a two-stroke internal combustion engine structure; according to patent retrieval and published information, only one person has proposed a process principle for a free-piston four-stroke internal combustion (hydraulic) engine (same as The working principle of the traditional four-stroke internal combustion engine is exactly the same, and the energy output method is the same as the existing two-stroke hydraulic free piston engine), but it does not solve the problem of engine operation control (a problem that all parties have been seeking to break through), that is, the engine is only a principle model and cannot be used , the main specific problem involved is that the synchronous control of engine intake and exhaust has not been solved, so it cannot be practically applied to national construction.

Compared with the four-stroke internal combustion engine, the main advantage of the two-stroke internal combustion engine is that it has a simpler structure and does not require a special linkage valve system to cooperate; The coefficient is low, the combustion of fuel is incomplete, and the emission of pollutants exceeds the standard. Except for a very small number of places where the volume and weight are strictly controlled, most fields are no longer used; because the direct load of the two-stroke HFPE is reciprocating hydraulic pressure Therefore, when the pump is working, there is no fixed upper and lower dead center, and there is no special controllable valve system to cooperate. If the load changes frequently, it will directly cause the energy output of the internal combustion engine to be difficult to control and cause disorder, which will directly lead to flameout shutdown or knocking on the cylinder, and damage the engine; if used More additional technical means, for example, adding a dedicated state detection sensor and a special energy balance device (which can be understood as a capacitor) can also be used, but it will become very poor in terms of economy and reliability. Too much value for industrialized production

[0003] According to the published documents, there are specialized laboratories in Germany, the United States, the Netherlands and Japan conducting relevant research, Zhejiang University and Qingdao Vehicle Research Institute in China also conduct specialized research and are supported by the National Natural Science Foundation of China; there are also specialized laboratories at home and abroad. Some people have established related technology companies. According to domestic and foreign patents and literature searches, there have been no fundamental breakthroughs.

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