Abstract
The article discusses the results of tests carried out under real operating conditions, based on which a custom test for road-rail vehicles was developed. The proposed test reflects the working conditions in which road-rail vehicles are used. The measurements were performed for a vehicle equipped with an internal combustion engine during five stages of operation. Measuring cycles included driving on a paved road, rolling on tracks and running on a track without load, with a load of 90 tons and with a load of 140 tons. The article compares the legislative guidelines with actual operation, thanks to which guidelines for the road-rail test for assessing the exhaust emission of harmful gases were developed. Based on the recorded data, a test proposal was described, taking into account the operating time share during the test, the average speed of travel and the duration of the test cycle. In addition, guidelines on the test procedure in the proposed test are discussed.
Highlights
The article discusses the results of tests carried out under real operating conditions, based on which a custom test for road-rail vehicles was developed
The type approval tests concerning the exhaust emission of harmful gases emitted from non-road vehicles are carried out on the engine dynamometer
This is mainly due to the large variety of machines and vehicles that fall into the NRMM (Non-Road Mobile Machinery) group
Summary
A road-rail tractor was used in the conducted tests (fig. 2, Table 1), it was equipped with an engine with a maximum power of 116 kW and a maximum torque of 640 Nm. The PEMS (Portable Emissions Measurement System) measuring equipment was used to carry out the exhaust emissions measurements in real operating conditions of a road-rail vehicle. The exhaust gases are further cooled down to 4°C, after which the measurement of the concentration of nitrogen oxides is carried out using the NDUV method (Non-Dispersive Ultraviolet). The measurement of particulate concentration was carried out using the AVL MSS 483 mobile analyzer (Micro Soot Sensor). This device operates based on the photoacoustic method, which enables high accuracy measurement (down to 1 μg/m3). Data from the vehicle's diagnostic system was sent directly to the central measuring equipment unit This allowed for continuous recording of the engine operating parameters (crankshaft speed, load generated).
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