6837092898

Diagnostyka’ 4(48)/2008    13

KEKEZ, AMBROZIK, RADZISZEWSKI, Modeling of Cylinder Pressure in Compression Ignition Engine ...

MODELING OF CYLINDER PRESSURE IN COMPRESSION IGNITION ENGINE WITH USE OF GENETIC-FUZZY SYSTEM PART 2: ENGINE FUELED BY FAMĘ

Michał KEKEZ. Andrzej AMBROZIK, Leszek RADZISZEWSKI

Kielce University of Technology, Faculty of Mechatronics and Machinę Building 25-314 Kielce, Al. Tysiąclecia Państwa Polskiego 7, Building B, fax: [phone], e-mail: in.kekezf/ tu.kielce.pl, [e-mail] [e-mail]

Summary

This paper concems measurement and modeling cylinder pressure in diesel engine. The inain aiin of this paper is to build tlie analytical-empirical model of work of engine fueled by different fuels. The experiments on engine test bench were conducted and a model of engine work was created by means of proposed GFSm system. In Part 1 the engine was fueled by diesel oil, and in Part 2 - fueled by methyl esters of rapeseed oil (FAMĘ).

Keywords: diesel engines, modeling, fuzzy Systems, genetic algorithms.

MODELOWANIE PRZEBIEGU CIŚNIENIA W CYLINDRZE SILNIKA O ZAPŁONIE SAMOCZYNNYM PRZY POMOCY ALGORYTMU GENETYCZNO-ROZMYTEGO CZĘŚĆ 2: SILNIK ZASILANY PALIWEM FAMĘ

Streszczenie

Praca dotyczy zagadnień związanych z pomiarem i modelowaniem przebiegów ciśnień w cylindrze silnika o zapłonie samoczynnym. Głównym jej celem jest budowa modelu analityczno-eksperymentalnego pracy silnika zasilanego różnymi paliwami. Przeprowadzono badania na hamowni i opracowano model pracy silnika za pomocą proponowanego systemu GFSm. W części pierwszej pracy silnik zasilany byl olejem napędowym, a w części drugiej -estrami metylowymi oleju rzepakowego (FAMĘ).

Słowa kluczowe: silniki o zapłonie samoczynnym, modelowanie, systemy rozmyte, algorytmy genetyczne.

Literaturę analysis presented in Part 1 shows that existing engine work models. both numerical and analytical, have limitations which make it difficult to use them in practice. As a result, the following aims were formulated: 1) experimental research of cylinder pressure, 2) developrnent of a new genetic-

Table 1. Comparison of basie properties of diesel

oil and FAMĘ [1

Parameter	Ekodiesel Ultra D (diesel oil)	FAMĘ
cetane number	51.4	51
heating value fMJ/kgl	43,2	36,7
densitv at 15°C [g/cm^1l	0,8354	0,883
kinematic \iscosity |imn^2 3/sl (~40°C)	2,64	4,47
surface tension [N/tn] (20°C)	3,64-10’^3	3,58-10'^3
ignition temperaturę I°C1	63	> 130
average elementary composition [%] - C	87,2	76,8
- H	12,7	12,1
- 0	0	11

1

The aim of this work is to build a new analytical-empirical model of diesel engine work fuelled by FAMĘ. In order to achieve this, the measurements of cylinder pressure curves were madę on the test bench. The engine operated in extemal speed characteristic and load cliaracteristic regimes, with the crankshaft speeds frorn the rangę of 1000 to 2000 rpm.

2

INTRODUCTION

3

Ecological fuels like FAMĘ becarne veiy popular in recent years [1]. In comparison to diesel oil (see Table 1), FAMĘ has higher density and kinematic viscosity and different elementary composition (FAMĘ contains O). However, the cylinder pressure curves of engine fueled by diesel oil and FAMĘ are sitnilar [4], Having known this curve, we can calculate a series of important values such as: mean indicated pressure, indicated power, start of ignition. The results of measurements for diesel oil were used to build the model of engine work, by means of the method frorn the field of artificial intelligence (based on fuzzy sets theory). It was presented in Part 1. Acąuired model was next "tuned” for modeling of engine fueled by FAMĘ.