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The second-order sliding-mode controller based on improved sub-optimal algorithm for synchronous Buck converte r is designed, and the converter can be controlled only by detecti ng the output voltage without measuring the capacitance current of the converter. By introducing hysteresis to sub-optimal algorit hm, the switching frequency of the converter is limited when the output voltage is stable....
A geometry model of a diesel engine's piston is set up in UG. The temperature fields of the piston for burning diesel and DME separately are calculated using ANSYS 10.0. The result shows that the variation of the thermal load by substituting diesel with DME is still within the thermal strength of the material, thus provides supporting evidence for using DME on diesel engines.
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