Fuel consumption standardization technique for LiAZ-5256.57 buses using the example of the municipal unitary enterprise “Yakut Passenger Transport Company”, Republic of Sakha (Yakutia)
The article analyzes suburban bus transportation with specific routes in the Republic of Sakha (Yakutia). For the experimental study, the route No. 101, “Yakutsk – Tabaga” with a total length of 31 km was chosen. The schedule of buses of Municipal Unitary Enterprise "Yakut Passenger Transport Company (YAPAK)” on the suburban route is shown. The basic technical data of the bus LiAZ-5256.57 was studied. In accordance with international regulations for the buses, the determination of fuel consumption and specific emissions of normalized toxic components is carried out using a riding cycle on running drums. For the calculation of fuel consumption, the technique of modeling of indicators of work of the engine which provide change of traction and speed characteristics of the car according to the set driving cycle was used. Finally, the results of the calculated fuel consumption for the NEDC driving cycle are compared with experimental data. As a comparison of the calculated and theoretical fuel consumption data with practical data, the Cummins engine type CG 250 is considered. This internal combustion engine is installed on a LiAZ-5256.57 bus. Experimental data on the fuel consumption of this bus per 100 km. showed 49 nm3, and theoretical calculations of bus fuel consumption per 100 km. by the proposed method showed 48 nm3. Therefore, to assess the traction and speed properties of the bus, the proposed combined method can be used which allows one to obtain calculation of fuel consumption which is closer to the experimental data on a driving cycle. Using the source data of the vehicle, effective engine performance indicators are evaluated. A calculation method is proposed for modeling a test, and experimental driving cycle of automobile transport with a total mass of more than five tons is suggested.
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