A two-cylinder four-stroke hydraulic free-piston engine based on electronically controlled compression stroke

Abstract

The invention provides a two-cylinder four-stroke hydraulic free piston engine based on an electric control compression stroke. The two-cylinder four-stroke hydraulic free piston engine is easy to control and stable in compression process and comprises an internal combustion engine part, a hydraulic part, a motor / engine body and the like. A hydraulic pump piston and a power piston are connected through a piston rod to form piston assemblies which are installed on a hydraulic cylinder body and an internal combustion engine cylinder body. A rack is installed on the piston rod and meshed with a gear. An output shaft of the gear is connected with an output shaft at one end of the motor / engine body, and the other end of the motor / engine body is connected with an output shaft of a hydraulic pump / motor. Power is supplied to the motor / engine body through a super-capacitor / storage battery, and the running conditions of the motor / engine body are controlled by a motor controller. The two piston assemblies move towards an upper stopping point or a lower stopping point at the same time under the drive of a gear-rack pair, during the compression stroke, a proper compression ratio is obtained in the mode that the motor drives the gear to drive the piston assemblies to compress fresh air in a compression combustion cavity, and during the expansion stroke, due to the fact that a motor recovery part in the generator condition expands, braking of the piston assemblies can be achieved.

Description

technical field [0001] The invention relates to an engine, in particular to a two-cylinder four-stroke hydraulic free-piston engine based on an electronically controlled compression stroke. Background technique [0002] In order to maintain the sustainable development of the global economy, people pay more and more attention to the two major issues of energy saving and environmental protection, and take various measures to reduce energy consumption. As a large energy consumer, construction machinery has also become the main battlefield for people to achieve energy saving. The application of potential energy recovery, braking energy recovery and hybrid power system has improved the utilization rate of energy to a certain extent and realized the energy saving of construction machinery. The application of these methods does not involve the technical innovation of the internal combustion engine itself, but only related improvement and optimization on the hydraulic system. The tr...

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Problems solved by technology

Since the hydraulic oil in the accumulator is recycled, the external output pushes the piston for the compression stroke during the compression stroke, and absorbs the hydraulic energy during the expansion stroke. In the process of reciprocating absorption / release of hydraulic energy, due to the More hydraulic control valves will inevitably produce a certain energy loss, which will affect the external output pressure energy of each cycle, resulting in unstable compression process of the engine, which is also a major problem restricting the industrialization of hydraulic free piston engines

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