As fuel temperature increases, both its viscosity and surface tension decrease, and this is helpful to improve fuel atomization\nand then better combustion and emission performances of engine. Based on the self-regulated temperature property\nof positive temperature coefficient material, this article used a positive temperature coefficient material as electric\nheating element to heat diesel fuel in fuel pipeline of diesel engine. A kind of BaTiO3-based positive temperature coefficient\nmaterial, with the Curie temperature of 230C and rated voltage of 24 V, was developed, and its micrograph and\nelement compositions were also analyzed. By the fuel pipeline wrapped in six positive temperature coefficient ceramics,\nits resistivityââ?¬â??temperature and heating characteristics were tested on a fuel pump bench. The experiments showed that\nin this installation, the surface temperature of six positive temperature coefficient ceramics rose to the equilibrium temperature\nonly for 100 s at rated voltage. In rated power supply for six positive temperature coefficient ceramics, the\ntemperature of injection fuel improved for 21Cââ?¬â??27C within 100 s, and then could keep constant. Using positive temperature\ncoefficient material to heat diesel in fuel pipeline of diesel engine, the injection mass per cycle had little change,\napproximately 0.3%/C. This study provides a beneficial reference for improving atomization of high-viscosity liquids by\nemploying positive temperature coefficient material without any control methods.
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