Mathematical Model for the Injector of a Common Rail Fuel-Injection System

Abstract

The paper describes a Diesel fuel injection process. Computer simulation was carried out together with measurement of the Common Rail accumulator fuel-injection system. The computer simulation enables the observation of the phenomena from rail pressure, being the input data for injection parameters calculations, to the injection rate. By means of computer simulation, the pressure values in specific sections of the injection nozzle may be computed, the needle lift, injection rate, total injected fuel, time lag from injector current to first evidence of injection process and other time-lags between various phases of the injection process. The injection rate provides input data for spray computer simulation. Measurements of injection and combustion were carried out within a transparent research engine. This engine is a single-cylinder transparent engine based on the AUDI V6 engine, equipped with a Bosch Common Rail Injection System. The comparison between the computed and measured injection parameters showed good matching.

Keywords

Share and Cite:

Marčič, S. , Marčič, M. and Praunseis, Z. (2015) Mathematical Model for the Injector of a Common Rail Fuel-Injection System. Engineering, 7, 307-321. doi: 10.4236/eng.2015.76027.

Conflicts of Interest

The authors declare no conflicts of interest.

 [1] Allevi, L. (1909) Algemeine Theorie über der veränderliche Bewegung das Wasser in Leitungen. Springer Verlag, Berlin. http://dx.doi.org/10.1007/978-3-642-52015-0 [2] Rothrock, A.M. (1936) Hydraulics of Fuel Injection Pump for Compression-Ignition Engines. NACA Report No. 396. [3] Schley, W. (1967) Theoretische und experimentelle Untersuchungen zur analytischen Darstellung der Wellendämp- fungen von hydraulischen Einspritzsystemen. Diss. München. [4] Rodrigues-Anton, et al. (2008) Volumetric Properties at High Pressure of Waste Oil Methylester Compared with Diesel Oil. Fuel, 87, 1934-1940. [5] Marcic, M. and Kovacic, Z. (1985) Computer Simulation of the Diesel Fuel Injection System. SAE 851583. [6] Marcic, M. (1995) Calculation of the Diesel Fuel Injection Parameters, SAE 952071. [7] Fettes, C., Schraml, S., Heimgärtner, C. and Leipertz, A. (2000) Analysis of the Combustion Process in a Transparent Passenger Car DI-Diesel Engine by Means of Multi-Dimensional Optical Measurements Techniques, SAE 2000-01- 2860. [8] Fettes, C. and Leipertz, A. (2001) Potentials of a Piezo-Driven Passenger Car Common Rail System to Meet Future Emission Legislations—An Evaluation by Means of In-Cylinder Analysis of Injection and Combustion, SAE 2001-01- 3499. [9] Marcic, M., Avsec, J., Wensing, M., Schmidt, M., Leipertz, A. and Fettes, C. (2010) Calculation and Measurements of Self-Ignition Nuclei in Diesel Combustion. Energy & Fuels, 24, 811-820.