Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


ISSN: 1451-4117

E-ISSN: 1821-31977
Volume 6 number 21, pages: 35 - 44

Danon Gradimir 
University of Belgrade, Faculty of Forestry

Mitrovic Caslav  
University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia

This research should provide the answer if there are technical and financial justifications the Tire Pressure Monitoring System to be included in tender for purchase of new buses for Belgrade Transport. For this purpose Tire Pressure Monitoring System (TPMS) was purchased and previously successfully tested on the passenger car for more than 1000 km. Six TPMS sensors are mounted on valves (instead of caps) of outer tires, and receiving control unit in the drivers cab. Equipped bus was operating for one month. Drivers of the buses had the task to fill in the appropriate form with the data about tire pressure and temperatures, during the breaks on the end of the each route. Tires pressure declined till the end of experiment differently from tire to tire; the differences are between 3% (0.2 bar) and 4% (0.3 bars). Front left tire is exception and the pressure drop on this tire is 12% or 0.9 bars. Average bus tire air temperatures during experiment were between 27°C and 34°C. Maximum recorded temperature was 56°C, and it was attained in evening not in rush time. Research and Cost Benefit Analysis indicated that the investment would pay back in second year and existence of TPMS on the buses would increase the safety and quality of transport.

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