Ignition protection module, system and method of free-piston type internal-combustion engine
A piston type, internal combustion engine technology, applied in the direction of automatic control, automatic control, electrical automatic control, etc., can solve the problems of economical efficiency, poor power performance, deterioration of engine performance, difficulty in exerting the compression ratio of free piston internal combustion engines, etc., to achieve The effect of ensuring safe operation
Inactive Publication Date: 2010-02-10
SHANGHAI JIAOTONG UNIV
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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 performance of the engine and deteriorate the economy and power. It is difficult to take advantage of the variable compression ratio of the free-piston internal combustion engine.
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[0071] Example simulation
[0072] Computer simulation has low cost and can more accurately reflect the research object. For the ignition system proposed by the present invention, through simulation modeling, the different working processes of the ignition system under normal and abnormal conditions can be investigated, which is beneficial to further understand the characteristics of the ignition system.
[0073] (1). Simulation of normal ignition
[0074] 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 calculations, the time constant of the primary loop of this design 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 electrical energy, but may also damage the circuit. Use Matlab / Simulink to compile a program to test the chang...
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A free piston type combustion engine ignition system, a method and a protective module belong to the combustion engine technical field. The system comprises an input signal sensor, an ignition actuator and an electronic control unit, wherein the input signal sensor comprises a Hall sensor and a linear displacement transducer; the linear displacement transducer is in electrical connection with theHall sensor and is triggered by the Hall sensor; the Hall sensor is arranged on the moving line of the connecting rod of a free piston type combustion engine. When the connecting rod passes, the Hallsensor triggers the linear displacement transducer to carry out induction of the displacement of the connecting rod; when the displacement reaches to a preset value, the electronic control unit controls the ignition actuator to carry out ignition; moreover, the connecting rod undergoes braking and backward movement by means of thermodynamics principle, and the process is repeated. The free pistontype combustion engine ignition system can realize realtime judgment of the position of the connecting rod so as to accurately control ignition time; meanwhile, ignition parameter can be flexibly adjusted according to operating condition so as to ensure that the free piston type combustion engine operates under an optimum condition.
Description
Technical field [0001] The invention relates to an ignition protection module, system and method in the technical field of internal combustion engines, in particular to a free piston type internal combustion engine ignition protection module, system and method. Background technique [0002] Free-piston internal combustion engine refers to a special internal combustion engine in which the usual crank and connecting rod mechanism is removed from the engine, and the movement of the piston is not physically restricted. The structure generally includes two cylinders with coaxial openings facing each other, and a movable connecting rod is placed in the cylinder at both ends and reciprocates in the axial direction. Because it is not restricted by mechanical rods, its power piston is free, that is, the compression ratio is variable. Compared with the traditional crankshaft engine, it eliminates the need for the crank connecting rod mechanism of the crankshaft internal combustion engine ...
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IPC IPC(8): F02P5/145
Inventor 肖进黄震李庆峰
Owner SHANGHAI JIAOTONG UNIV