Research Article

Advances in Mechanical Engineering 2016,Vol.8(1)1–11óThe Author(s)2016

DOI:10.1177/1687814015624837

http://www.doczj.com/doc/574fa1cc650e52ea551898e4.html

Research of fuel temperature control in fuel pipeline of diesel engine using positive temperature coefficient material

Xiaolu Li,Zai Sun,Lefeng Gu,Jianqiang Han,Jun Wang and Shanqiang Wu

Abstract

As fuel temperature increases,both its viscosity and surface tension decrease,and this is helpful to improve fuel atomiza-tion and then better combustion and emission performances of engine.Based on the self-regulated temperature prop-erty of positive temperature coefficient material,this article used a positive temperature coefficient material as electric heating element to heat diesel fuel in fuel pipeline of diesel engine.A kind of BaTiO 3-based positive temperature coeffi-cient material,with the Curie temperature of 230°C and rated voltage of 24V ,was developed,and its micrograph and element compositions were also analyzed.By the fuel pipeline wrapped in six positive temperature coefficient ceramics,its resistivity–temperature and heating characteristics were tested on a fuel pump bench.The experiments showed that in this installation,the surface temperature of six positive temperature coefficient ceramics rose to the equilibrium tem-perature only for 100s at rated voltage.In rated power supply for six positive temperature coefficient ceramics,the temperature of injection fuel improved for 21°C–27°C within 100s,and then could keep http://www.doczj.com/doc/574fa1cc650e52ea551898e4.htmling positive tem-perature coefficient material to heat diesel in fuel pipeline of diesel engine,the injection mass per cycle had little change,approximately 0.3%/°C.This study provides a beneficial reference for improving atomization of high-viscosity liquids by employing positive temperature coefficient material without any control methods.

Keywords

Diesel fuel temperature,positive temperature coefficient material,resistivity–temperature characteristic,pipeline

Date received:6September 2015;accepted:30November 2015Academic Editor:Jose Ramon Serrano

Introduction

With the rapid growth of vehicles worldwide,people not only restrict its fuel consumption,but also consti-tute more rigid regulations to decrease vehicle emis-sions.Since nearly 50%–80%hydrocarbon (HC)and carbon monoxide (CO)emissions are emitted during cold start of vehicles,many countries have the regula-tions to test vehicle emissions at 27°C or lower.1–3Furthermore,there is a cold start trouble on diesel engine.4Many researches illustrated that elevation of diesel fuel temperature not only improves cold-start

emissions of engine,but also was beneficial for its cold start.2,5

Effective atomization of diesel fuel could increase the contact area with in-cylinder compressed air,fuel

College of Electrical and Mechanical Engineering,China Jiliang University,Hangzhou,China

Corresponding author:

Xiaolu Li,College of Electrical and Mechanical Engineering,China Jiliang University,258Xueyuan Street,Xiasha T own,Hangzhou 310018,China.Email:

lixiaolujl@http://www.doczj.com/doc/574fa1cc650e52ea551898e4.html

Creative Commons CC-BY:This article is distributed under the terms of the Creative Commons Attribution 3.0License (http://www.doczj.com/doc/574fa1cc650e52ea551898e4.html/licenses/by/3.0/)which permits any use,reproduction and distribution of the work without

further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://http://www.doczj.com/doc/574fa1cc650e52ea551898e4.html/en-us/nam/open-access-at-sage).