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Control method for piston motion track of free piston engine

A piston engine and piston movement technology, applied in the field of control, can solve problems such as the lack of piston movement control system

Active Publication Date: 2017-10-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, FPEG is not widely used in real vehicles, and one of the key problems is the lack of a reliable piston motion control system.

Method used

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  • Control method for piston motion track of free piston engine
  • Control method for piston motion track of free piston engine
  • Control method for piston motion track of free piston engine

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Experimental program
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Embodiment Construction

[0133] The present invention is based on the piston trajectory control method of the free piston generator of linear quadratic optimal control (LQR)+extended state observer (ESO), and its steps are:

[0134] ① Construction of the simulation model of the free piston generator;

[0135] ②Piston trajectory control of free piston generator; make the trajectory of the piston follow the upper reference trajectory, which is the trajectory of the piston when the FPEG works under the load required by the driver and meets the safety conditions;

[0136] ③ Establish a control-oriented model;

[0137] ④ Design of linear quadratic optimal controller;

[0138] ⑤Design of extended state observer;

[0139] ⑥ Uncertainty compensation.

[0140] The building process of the free piston generator simulation model of the present invention is:

[0141] ⑴ Kinematics model derivation:

[0142] The force on the free-piston generator is defined as positive movement to the right, and the force on th...

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Abstract

The invention discloses a control method for piston motion track of a free piston engine, and belongs to the technical field of control. The invention aims to provide the control method for the piston motion track of the free piston engine, and the control method establishes a free piston internal combustion engine generator mechanism model system under an MATLAB environment according to the working mechanism of the free piston internal combustion engine generator, can effectively compensate interferences and keeps stable operation of the free piston internal combustion engine generator. The control method comprises the following steps of: establishing a free piston electric generator simulation model; controlling piston track of the free piston electric generator; enabling track of the piston to trace reference track, wherein the reference track is that a FPEG works under load needed for a driver; establishing a control-oriented model; designing a quadric-form secondary optimal controller; expanding design of a state observer; and performing uncertainty compensation. According to the control method disclosed by the invention, a control-oriented simplified model of the system is established, a piston motion control method based on linear quadratic type (LRQ) and extended state observer (ESO) is disclosed, and piston motion track of EPEG is controlled by regulating circulating oil spray amount.

Description

technical field [0001] The invention belongs to the technical field of control. Background technique [0002] The development of the automobile industry and the increase in car ownership as well as the depletion of oil resources and environmental pollution have posed severe challenges to the traditional automobile industry. Following the energy development situation and energy development strategy, research and development and use of new energy vehicles with energy saving and emission reduction have become The only way to solve energy and environmental problems. As a market-oriented model in the research and development of pure electric vehicles, hybrid vehicles have become a hot spot in the development of contemporary vehicles. Free Piston Engine Generator (FPEG), as a new auxiliary power source for hybrid electric vehicles, has the advantages of small size, light weight, simple structure, and easy maintenance. Because FPEG cancels the traditional engine crank mechanism, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B71/00F02B63/04F02D29/06F02D39/10
Inventor 刘迪宫洵史少云胡云峰许志国陈虹
Owner JILIN UNIV
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