1. Research programme of operational tests

Three Mercedes-Benz trucks with the engine power up to 290-320 kW have been planned for the execution of tests to research diesel fuel without additive and with additive. The tests in

operation will be effected with winter and summer diesel fuel without additive and the same fuel into which MPG -MEGA – СrumbsTM has been added (1 gram of additive per 100 litres of fuel).

Before the tests the diesel fuels that have been bought from different filling stations will be examined in laboratory and their physicochemical properties will be specified. When it is ascertained that a fuel corresponds to standard, operational tests without catalyst and with catalyst will be effected in trucks.

2. Facilities and measuring instruments of operational tests

The tests were accomplished on three trucks Mercedes-Benz ACTROS 1840LS.

During the tests the outdoor temperature varied -15 ºC ...+20 ºC.

Exhaust gas measurements were performed at idling, medium speed- and maximum speed using gas analyzer QUINTOX KM 9106.

The diesel fuel variants being examined were prepared as the mixture of winter or summer diesel fuel, produced on the basis of petroleum, and additive MPG-MEGA–СrumbsTM where the proportion of additives was 100 litres – 1gram.

The tests of all three Mercedes-Benz trucks were performed in accordance with the EU requirements. Exhaust gas analyzer readings for CO, CO2, NO, NOx, SO2 at idling 600 min-1, medium speed 1100 min-1 and maximum speed 2100 min-1 were determined on all three trucks.

Fuel consumption was determined at operation without catalyst and with catalyst for the run of 100 km.

Fuel consumption was measured with checked commercial flow meter.The indicator of fuel consumption was compared to the flow meters in trucks and readings of computers.

The exhaust gas measurements were performed with the gas analyzer KH 9106 of the test laboratory.

The physicochemical properties of the diesel fuel in three Mercedes-Benz trucks were determined by laboratorial tests.

Density was measured at the temperature 15ºC using the aerometer method EN ISO 3675. Cetane index was calculated according to the method EVS- EN ISO 4264.

Lubricity was assessed using HFRR TE 80 unit in accordance with EVS-EN ISO 12156-1:2006.

The concentration of sulfur was determined using TS – 100 ultraviolet fluorescence method EVS-EN ISO 20846:2004.

Flash point was determined in Pensky-Martens closed cup tester according to EVS-EN ISO 2719.

The concentration of ash was determined in muffle furnace according to EVS-EN ISO 6245:2003.

Kinematic viscosity was determined at 40 ºC in Cannon-Fenske Opaque tester according to EVS-EN ISO 3104:2000.

Fuel distillation was carried out in a tester with electric heating in accordance EVS-EN ISO 3405:2000.

The concentration of fat acid methyl esters (FAME) was determined using infrared FT-IR spectrometer model Interspec 2020.

The concentration of hydrocarbon in diesel fuel without catalyst and with catalyst MPG -MEGA – СrumbsTM was measured using the infrared FT-IR spectrometer model Interspec 2020.

3. Analysis of operational test data

The physicochemical properties of winter and summer diesel fuel without catalyst and with catalyst MPG-MEGA–СrumbsTM were determined by laboratorial tests. The results of tests performed by laboratory have been presented in tables 7 and 8.

Table 7. Physicochemical properties of winter diesel fuel with and without MPG-MEGA– СrumbsTM.

When adding catalyst MPG-MEGA–СrumbsTM into the diesel fuel of the truck Mercedes-Benz reg. no 302 APZ at idling 600 min-1, the concentration of carbon oxide (CO) in exhaust gas decreased by 11,7 %, the concentration of carbon dioxide (CO2) remained unchanged, the concentration of nitric oxide (NO) decreased by 4 %, the concentration of nitric oxides (NOx) in exhaust gas decreased by 3,2 % and toxicity index improved by 13,3 %. At medium speed 1100 min-1 after the addition of catalyst MPG-MEGA–СrumbsTM into diesel fuel the concentration of carbon oxide (CO) in exhaust gas decreased by 22,2 %, the concentration of carbon dioxide (CO2) remained unchanged, the concentration of nitric oxide (NO) decreased by 26,4 %, the concentration of nitric oxides (NOx) decreased by 19,8 % and toxicity index improved by 19,1%.

After the addition of catalyst MPG-MEGA–СrumbsTM into the diesel fuel at maximum speed 2100 min-1 the concentration of carbon oxide (CO) in exhaust gas decreased by 20,2 %, the concentration of carbon dioxide (CO2) remained unchanged, the concentration of nitric oxide (NO) in exhaust gas decreased by 13,9 %, the concentration of nitric oxides (NOx) decreased by 14,2 % and toxicity index improved by 21,6 %.

The special consumption of fuel decreased after the addition of catalyst MPG-MEGA–СrumbsTM into the diesel fuel of truck reg. no 048 MKB by 16,9 % , truck reg. no 062 ARU by 12,3 % and truck reg. no 302 APZ by 13,6 %.

When using the diesel fuels catalyst MPG-MEGA–СrumbsTM, air pollution decreased correspondingly to EU norm 6 normative act 715/2007-2015. Pursuant to normative act 715/2007-2015 the following concentrations in exhaust gas are allowed: carbon oxide (CO) – 0,5 g/km and nitric oxides (NOx) – 0,08 g/km. These indicators in the tested trucks were as follows: Mercedes-Benz reg. no 048 MKB – the concentration of carbon oxide (CO) 0,35 g/km and the concentration of nitric oxides (NOx) 0,078 g/km; Mercedes-Benz reg. no 062 ARU – the concentration of carbon oxide (CO) 0,44 g/km and the concentration of nitric oxides (NOx) 0,06 g/km; Mercedes-Benz reg. no 302 APZ – the concentration of carbon oxide (CO) 0,49 g/km, the concentration of nitric oxides (NOx) 0,03 g/km.

Thus, all the Mercedes-Benz trucks conform to the Euro 6 norms.