Free-piston type internal combustion engine

A piston type, internal combustion engine technology, applied in automatic control, automatic control, electrical automatic control and other directions, can solve the problems of poor economy, power performance, deterioration of engine performance, inability to flexibly adjust the ignition position, etc., to ensure safe operation, The effect of improving performance

Inactive Publication Date: 2008-12-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it cannot flexibly adjust the ignition position when the working conditions change. Inappropriate ignition timing under certain working conditions will deteriorate the p

Method used

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  • Free-piston type internal combustion engine
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  • Free-piston type internal combustion engine

Examples

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Embodiment

[0052] Example Simulation

[0053] The cost of computer simulation is low, and it can reflect the research object more accurately. For the ignition system proposed by the present invention, through simulation modeling, different working processes of the ignition system under normal and abnormal conditions can be investigated, which is conducive to further understanding the characteristics of the ignition system.

[0054] (1).Simulation of normal ignition

[0055] High-energy ignition coil parameters: primary winding 0.55Ω, inductance 5.8mH; secondary winding 6.2kΩ, inductance 14H; energy conversion efficiency 75%, sampling resistance 0.1Ω. According to the calculation, the time constant of the primary circuit in this design scheme is about 8.9ms. Under this charging time, the primary cut-off current can reach more than 10A without limitation. Not using current limiting control not only wastes electric energy, but also may damage the circuit. Using Matlab / Simulink to program,...

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PUM

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Abstract

A free piston type combustion engine comprises a cylinder, a connecting rod and an ignition system, wherein the connecting rod is arranged inside the cylinder, and moves to and fro between two opposed combustion chambers of the cylinder; the ignition system comprises an input signal sensor, an ignition actuator and an electronic control unit; the electronic control unit is in electrical connection with the input signal sensor and the ignition actuator so as to receive signal from the input signal sensor and to control the ignition of the ignition actuator; the input signal sensor comprises a Hall sensor and a linear displacement transducer; and the Hall sensor is arranged on the moving line of the connecting rod of the free piston type combustion engine. When the connecting rod passes, the Hall sensor triggers the linear displacement transducer to carry out accurate induction of the displacement of the connecting rod; moreover, when the displacement reaches to a preset value, the electronic control unit controls the ignition actuator to carry out ignition. The free piston type combustion engine can realize real time judgment of the position of the connecting rod so as to accurately control ignition time and prevent the connecting rod from hitting against a cylinder cover and damaging the free piston type combustion engine.

Description

technical field [0001] The invention relates to equipment in the technical field of internal combustion engines, in particular to a free-piston internal combustion engine. Background technique [0002] The free-piston internal-combustion engine refers to a special internal-combustion engine in which the engine has canceled the usual crank-connecting rod mechanism and the piston movement is not subject to physical constraints. Its structure generally includes two coaxial cylinders with opposite openings, and two ends of a movable connecting rod are respectively placed in the cylinders, and reciprocate along the axial direction. Because it is not bound by mechanical rods, its power piston is free, that is, the compression ratio is variable. Compared with the traditional crankshaft engine, it omits the crank connecting rod mechanism that converts the reciprocating motion of the piston into rotational motion in the crankshaft internal combustion engine, and has the advantages o...

Claims

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Application Information

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IPC IPC(8): F02P5/145
Inventor 肖进李庆峰黄震
Owner SHANGHAI JIAO TONG UNIV
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