Effects of boundary conditions on a Bosch-type injection rate meter

    Sandor Vass Affiliation
    ; Máté Zöldy Affiliation


Spread and evolution of Common Rail (CR) injection systems enable to influence injection events more efficiently than ever, while injection mass flow rate during an injection event crucially affects the combustion process. A measurement device based on the work of Bosch was set up, and measurements were made with different boundary conditions to explore the capabilities of the measurement system and to validate a detailed model of a CR injector. The main finding of this research work is, that orifice size had no noticeable effect on the measured injection rate traces, while it was stated in the original work that a small orifice is needed to terminate the measuring tube to maintain stable measurement conditions. Moreover, the backpressure level in the measuring system has a significant effect on the measured injection traces. If pressure in the measuring tube is low, gradient at the injection rate rise is lower, while if the pressure is comparable with that of a combustion chamber maximal compression pressure, measurement of higher doses is unaccomplishable due to the long pressure decrease time in the measuring tube after the end of the injection. Based on the results of the investigation, it can be stated that the Bosch-type injection rate measurement method does not give back the exact injection rate shape, a supplementing method would be necessary to calculate real nozzle flow rate.

First published online 1 March 2021

Keyword : diesel injector, common rail injector, injection rate measurement, injection rate meter, Bosch method, effects of boundary conditions

How to Cite
Vass, S., & Zöldy, M. (2021). Effects of boundary conditions on a Bosch-type injection rate meter. Transport, 36(4), 297-304.
Published in Issue
Nov 9, 2021
Abstract Views
PDF Downloads
Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.


Agarwal, A. K.; Srivastava, D. K.; Dhar, A.; Maurya, R. K.; Shukla, P. C.; Singh, A. P. 2013. Effect of fuel injection timing and pressure on combustion, emissions and performance characteristics of a single cylinder diesel engine, Fuel 111: 374–383.

Arcoumanis, C.; Baniasad, M. 1993. Analysis of consecutive fuel injection rate signals obtained by the Zeuch and Bosch methods, SAE Technical Paper 930921.

Bárdos, Á.; Vass, S.; Németh, H. 2014. Validation of a detailed commercial vehicle turbocharged diesel engine model, A Jövő Járműve (1–2): 25–31.

Benajes, J.; Payri, R.; Molina, S.; Soare, V. 2005. Investigation of the influence of injection rate shaping on the spray characteristics in a diesel common rail system equipped with a piston amplifier, Journal of Fluids Engineering 127(6): 1102–1110.

Blevins, J.; Wagner, D. 1999. An experimental investigation on determining diesel injector flow and transient characteristics using high response pressure measurements, SAE Technical Paper 1999-01-0197.

Bosch, W. 1966. The fuel rate indicator: a new measuring instrument for display of the characteristics of individual injection, SAE Technical Paper 660749.

Bower, G.; Foster, D. 1991. A comparison of the Bosch and Zuech rate of injection meters, SAE Technical Paper 910724.

Ghaffarpour, M.; Baranescu, R. 1996. NOx reduction using injection rate shaping and intercooling in diesel engines, SAE Technical Paper 960845.

Hiwase, S. D.; Moorthy, S.; Prasad, H.; Dumpa, M.; Metkar, R. M. 2013. Multidimensional modeling of direct injection diesel engine with split multiple stage fuel injections, Procedia Engineering 51: 670–675.

Jurić, F.; Petranović, Z.; Vujanović, M.; Katrašnik, T.; Vihar, R.; Wang, X.; Duić, N. 2019. Experimental and numerical investigation of injection timing and rail pressure impact on combustion characteristics of a diesel engine, Energy Conversion and Management 185: 730–739.

Marcic, M. 2006. Sensor for injection rate measurements, Sensors 6(10): 1367–1382.

Marčič, M. 1999. A new method for measuring fuel-injection rate, Flow Measurement and Instrumentation 10(3): 159–165.

Marčič, M. 2003. Measuring method for diesel multihole injection nozzles, Sensors and Actuators A: Physical 107(2): 152–158.

Medvegyev, P. 2016. A brexit-szavazás és a nagy számok törvénye, Statisztikai Szemle 94(10): 1050–1055. (in Hungarian).

Payri, R.; Salvador, F. J.; Gimeno, J.; Bracho, G. 2008. A new methodology for correcting the signal cumulative phenomenon on injection rate measurements, Experimental Techniques 32(1): 46–49.

Postrioti, L.; Buitoni, G.; Pesce, F. C.; Ciaravino, C. 2014. Zeuch method-based injection rate analysis of a common-rail system operated with advanced injection strategies, Fuel 128: 188–198.

Rottmann, M.; Menne, C.; Pischinger, S.; Luckhchoura, V.; Peters, N. 2009. Injection rate shaping investigations on a small – bore DI diesel engine, SAE Technical Paper 2009-01-0850.

Straubel, H. 1955. Ein neuer Zerstäuber für das Flammenphotometer, Microchimica Acta 43(2–3): 329–335. (in German).

Stumpp, G.; Ricco, M. 1996. Common rail – an attractive fuel injection system for passenger car DI diesel engines, SAE Technical Paper 960870.

Takamura, A.; Ohta, T.; Fukushima, S.; Kamimoto, T. 1992. A study on precise measurement of diesel fuel injection rate, SAE Technical Paper 920630.

Vass, S.; Németh, H. 2013. Sensitivity analysis of instantaneous fuel injection rate determination for detailed diesel combustion models, Periodica Polytechnica Transportation Engineering 41(1): 77–85.

Zeuch, W. 1961. Neue Verfahren zur Messung des Einspritzgesetztes und den Einspritz-Regelmäßigkeit von Diesel-Einspritzpumpen, MTZ 22: 344–349. (in German).

Zöldy, M. 2020. Fuel properties of butanol – hydrogenated vegetable oil blends as a diesel extender option for internal combustion engines, Periodica Polytechnica Chemical Engineering 64(2): 205–212.

Zöldy, M. 2019. Investigation of correlation between diesel fuel cold operability and standardized cold flow properties, Periodica Polytechnica Transportation Engineering (Online First): 1–6.

Zöldy, M.; Vass, S. 2018. Detailed modelling of the internal processes of an injector for common rail systems, Journal of KONES Powertrain and Transport 25(2): 415–426.