Fuel system components must perform optimally to ensure the maximum fuel economy and the minimum emissions. The key to optimised performance is effective characterisation of the system in the factory. This paper describes methods for discerning the features of a fuel injection system’s performance during built-unit testing. First, a background is given, highlighting the impact of environmental legislation. Next, specifications for a modern fuel system and key functionality characteristics are identified, and a brief overview of the alternative system configurations offered. The injector function is then discussed, with the importance of the key subcomponents being explained. Methods of testing and characterising the fuel injector performance in use are then described. Finally, there is discussion on the future of fuel system testing, and how developing challenges such as measuring the injection timing and the fuelling quantity in high-pressure, high-temperature and high-vibration environments might be overcome with better instruments and novel testing strategies including a paradigm shift away from steady-state testing to fully dynamic system testing.
JohnsonTV. Review of diesel emissions and control. Int J Engine Res2009; 10(5): 275–285.
5.
JohnsonTV. Diesel emissions in review. SAE paper 2011-01-0304, 2011.
6.
HardyCSHudsonCMHarperMS. Pressure is nothing without control: evolution of control valve design. In: Fuel systems for IC engines, London, UK, 14–15 March 2012, pp. 115–128. Cambridge: Woodhead Publishing.
7.
DaumSGillDTheisslH. Medium and heavy-duty diesel fuel injection system requirements to meet future emissions legislation. In: Fuel systems for IC engines, London, UK, 14–15 March 2012, pp. 129–139. Cambridge: Woodhead Publishing.
8.
HerrmanONakagawaMKenhardM. Ultra high pressure and enhanced multiple injection – potentials for the diesel engine and challenge for the injection system. In: Fuel systems for IC engines, London, UK, 14–15 March 2012, pp. 103–114. Cambridge: Woodhead Publishing.
9.
European Union. Council Directive of 3 December 1987 on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression ignition engines for use in vehicles, and the emission of gaseous pollutants from positive ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles (88/77/EEC). Final consolidated version before repeal: Document 01988L0077-20040501, http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:01988L0077-20040501 (2004, Directive version(s) accessed electronically April 2012).
10.
European Union. Directive 2005/55/EC of the European Parliament and of the Council of 28 September 2005 on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression ignition engines for use in vehicles, and the emission of gaseous pollutants from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles. Document 32005L0055, http://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1402947889043&uri=CELEX:32005L0055 (2005, Directive versions(s) accessed electronically April 2012).
11.
European Union. Directive 1999/96/EC of the European Parliament and of the Council of 13 December 1999 on the approximation of the laws of the Member States relating to measures to be taken against the emission of gaseous and particulate pollutants from compression ignition engines for use in vehicles, and the emission of gaseous pollutants from positive ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles and amending Council Directive 88/77/EEC. Document 31999L0096, http://eur-lex.europa.eu/legalcontent/EN/TXT/?qid=1402948457268&uri=CELEX:31999L0096 (1999, Directive versions(s) accessed electronically April 2012).
12.
European Union. Regulation (EC) No 595/2009 of the European Parliament and of the Council of 18 June 2009 on type-approval of motor vehicles and engines with respect to emissions from heavy duty vehicles (Euro VI) and on access to vehicle repair and maintenance information and amending Regulation (EC) No 715/2007 and Directive 2007/46/EC and repealing Directives 80/1269/ EEC, 2005/55/EC and 2005/78/EC (Text with EEA relevance). Document 32009R0595, http://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1402949281531&uri=CEL EX:32009R0595 (2009, Regulation versions(s) accessed electronically April 2012).
13.
United States Environmental Protection Agency. Emissions standards reference guide, Heavy-duty highway compression-ignition engines and urban buses – exhaust emission standardshttp://www.epa.gov/otaq/standards/heavy-duty/hdci-exhaust.htm (accessed April 2012).
14.
LeeH-KRusselMFBaeCS. Mathematical models of diesel fuel injection equipment incorporating non-linear fuel injection. Proc IMechE Part D: J Automobile Engineering2002; 216(3):191–204.
15.
ChungN-HOhB-GSunwooM-H. Modelling and injection rate estimation of common rail injectors for direct injection diesel engines. Proc IMechE Part D: J. Automobile Engineering2008; 222(6): 1089–1101.
16.
LeeJHChoSLeeSY. Bouncing of the diesel injector needle at the closing stage. Proc IMechE Part D: J Automobile Engineering2002; 216(8): 691–700.
17.
KoboriSKamimotoTAradiAA. A study of ignition delay of diesel fuel sprays. Int J Engine Res2000; 1(1): 29–39.
18.
Detail produced by kind permission of Delphi Diesel Systems, UK.
19.
FranklGBarkerBGTimmsCT. Electronic unit injectors. SAE paper 885013, 1988.
20.
MollenhauerKTschoekeH. Handbook of diesel engines. Berlin: Springer, 2010.
21.
WangT-CHanJ-SXieX-B. Parametric characterization of high-pressure diesel fuel injection systems. Trans ASME, J Engng Gas Turbines Power2003; 125(2): 412–426.
22.
MajerCJanetzkyBDöllR. Innovative measurement technologies for fuel injection systems. In: Fuel systems for IC engines, London, UK, 14–15 March 2012, pp. 301–311. Cambridge: Woodhead Publishing.
23.
NeedhamJRFaulknerSADoyleDM. Developing the truck engine for ultra low emissions. Proc IMechE Part D: J. Automobile Engineering1991; 205(3): 149–159.
24.
BoschW. The fuel rate indicator: a new measuring instrument for display of the characteristics of individual injection. SAE paper 660749, 1966,
25.
BowerGRFosterDE. A comparison of the Bosch and Zeuch rate of injection meters. SAE paper 910724, 1991.
26.
MatsuokaSYokotaKKamimotoT. The measurement of injection rate. Proc IMechE, Conf Proc1969; 184(10): 87–94.
27.
TakamuraAFukushimaSOmoriY. Development of a new measurement tool for fuel injection rate in diesel engines. SAE paper 890317, 1989.
28.
MarcicM. Sensor for injection rate measurements. Sensors2006; 6(10): 1367–1382.
29.
DernotteJHespelCFoucherF. Influence of physical fuel properties on the injection rate in a diesel injector. Fuel2011; 96:153–160.
30.
BoehmanALMorrisDSzybistJ. The impact of bulk modulus of diesel fuels on fuel injection timing. Energy Fuels2004; 18: 1877–1882.
31.
PayriRSalvadorFJGimenoJ. The effect of temperature and pressure on the thermodynamic properties of diesel and biodiesel fuels. Fuel2011; 90:1172–1180.
32.
NdiayeE-H IBazileJ-PNasriD. High pressure thermophysical characterization of fuel used for testing and calibrating diesel injection systems. Fuel2012; 98: 288–294.
33.
MerrittH. Hydraulic control systems. New York: John Wiley, 1967.
34.
Schmidt. The internal flow of diesel fuel injector nozzles; a review. Int J Engine Res2001; 2(1): 1–22.
35.
DesantesJMPayriRSalvadorFJ. Measurements of spray momentum for the study of cavitation in diesel injection nozzles. SAE paper 2003-01-0703, 2003.
36.
MarianiAPostriotiLUngaroC. Instrument for the test of the injectors based on measuring of spray momentum. In: Fuel systems for IC engines, London, UK, 14–15March2012, pp. 313–324. Cambridge: Woodhead Publishing.
37.
LuX-CZhangW-GQiaoX-QHuangZ. Fuel design concept for improving the spray characteristics and emissions of diesel engines. Proc IMechE Part D: J Automobile Engineering2005; 219(4): 547–557.
38.
RamírezAISomSAggarwalSK. Quantitative X-ray measurements of high-pressure fuel sprays from a production heavy duty diesel injector. Exp Fluids2009; 47: 119–134.
