Four-stroke free piston internal combustion engine

Abstract

The invention discloses a four-stroke free piston internal combustion engine. The four-stroke free piston internal combustion engine comprises a cylinder body, an air inlet valve set, a vent valve set, a spraying nozzle set, a piston set, a connecting rod set, a power output block, a position sensor and a control unit; the cylinder body comprises four air cylinders; the air inlet valve set comprises four electronic control air inlet mechanisms which are located in the above four air cylinders; the vent valve set comprises four electronic control vent mechanisms which are located in the above four air cylinders; the spraying nozzle set comprises four electronic control spraying nozzles which are located in the above four air cylinders; the piston set comprises four pistons which are arranged in the four air cylinders; the connecting rod set comprises four connecting rods which are connected to the above four pistons; the power output block is connected to the above four connecting rods, and a unique motion component of an internal combustion engine system is jointly formed and used for externally providing straight-line reciprocated power; the position sensor is used for determining the real-time position of the above motion component; and the control unit is electrically connected to the air inlet valve set, the vent valve set, the spraying nozzle set and the position sensor.

Description

technical field [0001] The invention relates to a power plant system, in particular to a four-stroke free-piston internal combustion engine, which belongs to the technical field of internal combustion engines. Background technique [0002] The free piston internal combustion engine refers to a special linear motion internal combustion engine in which the piston movement is not mechanically constrained by the crankshaft and connecting rod. Compared with the traditional internal combustion engine, it omits the crank connecting rod mechanism that converts the reciprocating motion of the piston into rotary motion in the crankshaft internal combustion engine, and has the advantages of simple structure, small number of parts, light weight, low cost, and high mechanical efficiency; In terms of force and movement, there is no lateral force between the piston and the cylinder, and the friction is small, thereby prolonging the life of the internal combustion engine; Variable, easy to...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing free-piston internal combustion engines at home and abroad all adopt a two-stroke structure, that is, the internal combustion engine does not have a separate intake and exhaust stroke, and only completes the ventilation process at the end of the expansion stroke; there is no crankcase, so the scavenging process requires additional consumption. energy; further, the short-circuit loss of the combustible mixture caused by the scavenging process is also very serious, and the fuel consumption is high

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