Modernization of the fuel system of diesel engine of agricultural tractor

The decrease in fuel systems reliability depends mostly on the fuel contamination. To solve the problem, an improved scheme of fuel system is proposed, it includes a fuel preheater and a rough filter of new design. A new design of rough filter is developed, it has a coiled filter element with the improved purification efficiency and good replacement life due to the effective spreading of porosity of filter material by means of its aimed crimping. This allows to reduce evenly the porosity in the direction of fuel stream and to increase the replacement life. The operational tests of improved fuel systems were performed on the basis of agricultural enterprises of the Tomsk region. The MTZ-82 agricultural tractor was chosen as subject of research. The working capacity of fuel system elements in regular and improved versions was evaluated by determining the numeral characteristics of random distribution of mean lifetime and parameters of reliability. Based on test results, the functions of distribution of probability of failure-free operation of the fuel injection pump plungers, the couple of injection jets, the injector spray nozzles of regular and improved diesel fuel systems are constructed. The study reveals that the improved version of fuel system decreases the failure rate of parts by 1.7-2.2 times in comparison with the regular one. It proves that the reliability is improved by means of reducing of contamination through the heated rough filter. The obtained results show the substantial improvement of fuel system reliability with the use of new rough filter.

diesel fuel, purification efficiency, filtration, heating, reliability improvement