Method for optimizing ignition position of free piston engine control system based on extremum searching

A piston engine and control system technology, applied in the direction of engine ignition, engine components, machine/engine, etc., can solve the problems of unfavorable free-piston engine development cycle, reduce the development cost of free-piston engine, heavy workload, etc., and achieve the reduction of online calculation The effect of increasing the amount, improving the final utilization rate and reducing the workload

Inactive Publication Date: 2016-11-09
JILIN UNIV
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Problems solved by technology

However, the traditional map calibration method has a long cycle, which is not conducive to shortening the development cycle of the free-piston engine, and the traditional calibration experiment workload is huge, which is not conducive to reducing the development cost of the free-piston engine

Method used

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  • Method for optimizing ignition position of free piston engine control system based on extremum searching
  • Method for optimizing ignition position of free piston engine control system based on extremum searching
  • Method for optimizing ignition position of free piston engine control system based on extremum searching

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Embodiment Construction

[0036] The structure of the free-piston engine studied in the present invention adopts the in-cylinder direct-injection gasoline engine of the double-piston four-cylinder four-stroke structure, and its structure is as follows figure 1 , figure 2shown. The two free piston assemblies are linked by a gear 6 and a rack 7, wherein the rack 7 is installed on the piston and connecting rod assembly 1, 2, the gear is installed on the gear shaft 15, and the two pairs of pistons realize four-stroke operation through mirror movement. In terms of air intake, the free piston engine cancels the intake and exhaust valve mechanism driven by the camshaft of the traditional engine, and adopts the electromagnetically driven variable valve timing mechanism 5, which is installed on the top of the cylinder. The application of variable valve timing technology can make the system ventilate at the optimal ventilating position, reduce the pumping loss and improve the output efficiency at the same time...

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Abstract

The invention discloses a method for optimizing an ignition position of a free piston engine control system based on extremum searching and belongs to the technical field of engines. The invention aims to provide a method for optimizing an ignition position of a free piston engine control system based on extremum searching. The method is characterized by enabling the free piston engine to stably operate at each operating point by controlling a management system, finding an optimal ignition position of the free piston engine by using an extremum searching strategy and completing map calibration. Two free piston components are meshed with each other via a gear and two racks; two pairs of pistons are subjected to four-stroke operation through mirror movement; an electromagnetically-driven variable-valve timing mechanism is mounted at the top of each cylinder; a geometric midpoint between a left cylinder and a right cylinder is an original point of a piston movement position; the extreme position which the pistons and connection rods reach during moving right is a lower stop point; the extreme position which the pistons and connection rods reach during moving left is an upper stop point. Through the method, the stability and the economy of operation of the free piston engine can be improved; the resources and the time consumed in the map calibration process of the ignition position can be reduced.

Description

technical field [0001] The invention belongs to the technical field of engines. Background technique [0002] In recent years, with the increasingly stringent emission regulations and the country's increased investment in environmental protection, hybrid vehicles, as an important part of new energy vehicles, have developed rapidly. The free-piston engine is a new type of power system that has been gradually developed in response to the application requirements of the power system of hybrid electric vehicles in recent years. The free piston engine omits the crank connecting rod mechanism and mechanical flywheel in the mechanical structure, directly uses the reciprocating motion of the piston in the combustion chamber to drive the linear generator or hydraulic pump, and directly converts the heat energy generated by fuel combustion into electricity or hydraulic output, so it has The fuel has a wide range of applications, less energy transfer and conversion links, and a compac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02P9/00G06F17/50
CPCF02P9/00G06F30/15
Inventor 宫洵王长勇胡云峰陈虹
Owner JILIN UNIV
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