A method for controlling the stable operation process of a free-piston engine

A piston engine and process control technology, applied in engine control, machine/engine, electrical control, etc., can solve problems such as piston movement influence, difficult stable operation, free piston engine movement instability, etc., to overcome the influence and improve work stability The effect of effective control of sex and piston movement

Active Publication Date: 2021-09-03
NANJING UNIV OF SCI & TECH
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the energy storage device such as a flywheel and the constraints of the crank-link mechanism in a conventional internal combustion engine, the movement of the piston is relatively fixed, and these disturbances cannot affect the movement of the piston.
However, the free-piston engine cancels the crank-connecting rod and flywheel structure, and the movement of the piston is relatively free, which is easily disturbed by the combustion fluctuations in the cylinder cycle, causing the movement of the free-piston engine to be unstable, and it is difficult to achieve continuous and stable operation.
At present, the difficulty in stable operation due to cyclic combustion fluctuations is one of the main difficulties leading to the large-scale commercial application of free-piston engines

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for controlling the stable operation process of a free-piston engine
  • A method for controlling the stable operation process of a free-piston engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0029] Such as figure 1 As shown, the free piston engine used in the embodiment includes a controller 1, a power converter 2, an energy storage device 3, a recovery device 4, a motor 5 and a scavenging chamber 6, a piston moving assembly 7, a cylinder 8, an ignition coil 9, Fuel injector 10.

[0030] The engine in the embodiment is a two-stroke engine. During the compression stroke, the piston assembly 7 moves upward under the push of the return device 4, and at the same time, the fuel injection nozzle 10 injects fuel into the cylinder. The end point of the compression stroke is controlled by an iterative learning algorithm. When the piston assembly 7 When reaching a certain position, the ignition coil 9 ignites the mixture in the cylinder, and the controller 1 estimates the combustion energy of the current cycle according to the peak pressure in the cylind...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for controlling the stable operation process of a free-piston engine. The control method includes: monitoring the pressure signal and displacement signal in the cylinder of the free-piston engine in real time; Control; when the engine is working on the expansion stroke, the controller estimates the energy generated by the current cycle combustion according to the combustion peak pressure in the cylinder; according to the estimated current cycle combustion energy, the power generation of the current cycle expansion stroke motor is given to ensure that the piston assembly is at Under the influence of random combustion cycle fluctuations, it is possible to move to a predetermined position to start the next cycle. The control method of the invention can overcome the inherent combustion cycle fluctuation of the gasoline internal combustion engine and ensure the continuous and stable operation of the free piston engine.

Description

technical field [0001] The invention belongs to the technical field of piston engines, in particular to a method for controlling the stable operation process of a free piston engine. Background technique [0002] As a new type of energy power device, the free piston engine has great development potential and can be used in various power occasions such as hybrid vehicles and extended-range electric vehicles, and has a broad market potential. [0003] Free-piston engines usually have three structures: single-piston, double-piston, and opposed-piston. The main part is composed of an internal combustion engine and an electric motor. [0004] The specific structure of a single-piston free-piston engine is as follows: figure 1 As shown, its mechanical structure is generally composed of a scavenging chamber 6 , a piston assembly 7 , a combustion chamber 8 , an ignition coil 9 and an internal combustion engine part of an injector 10 , a motor part 5 and a return device 4 . [0005...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D45/00F02D15/02
CPCF02D15/02F02D41/1406F02D45/00
Inventor 徐照平刘东刘梁
Owner NANJING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap