Abstract: A power train for hybrid vehicles increases the range of the transmission gear ratio within which the efficiency of the power train is superior. Furthermore, the method of operating the power train is varied depending on the transmission gear ratio, so that the power train can be operated with superior efficiency.

Abstract: A power train having dual modes for hybrid vehicles increases the range of the transmission gear ratio within which the efficiency of the power train is superior. The method of operating the power train varies depending on the transmission gear ratio, and thus the power train can be operated with superior efficiency.

Abstract: The present disclosure relates to a method of beat tuning in a slightly asymmetric ring-type structure, and can be effectively used to control the beat property of a structure such as a bell, which can be modeled to a slightly asymmetric ring. A method of beat tuning in a slightly asymmetric ring structure includes the steps of establishing an original ring model which simplifies said ring structure, establishing an equivalent imperfection mass model which is equivalent to said original ring model and has at least one or more point masses on an asymmetric ring, determining magnitudes and positions of the point masses in said equivalent imperfection mass model based on mode data of said original ring model, and determining magnitudes and positions of masses which should be added to or removed from said equivalent imperfection mass model in order to obtain desired beat properties.

Abstract: A power train for hybrid vehicles increases the range of the transmission gear ratio within which the efficiency of the power train is superior. Furthermore, the method of operating the power train varies depending on the transmission gear ratio, and thus the power train can be operated with superior efficiency.

Abstract: A power delivery system of a hybrid vehicle includes: a planetary gear part disposed including a first planetary gear, a second planetary gear, and a third planetary gear; a driving motor/generator part including a first motor/generator connected to the third planetary gear such that a power delivery can be performed therebetween, and a second motor/generator configured to deliver power to a driving shaft via the second planetary gear and supporting an engine in a starting state so as to operate the driving shaft; a clutch part connected to the planetary gear part such that the hybrid vehicle can drive by changing the operation mode at at least a critical mechanical point wherein the mechanical power of the driving motor/generator part is zero; and a controller controlling operations of the driving motor/generator part and the clutch part.

Abstract: A power train for hybrid vehicles increases the range of the transmission gear ratio within which the efficiency of the power train is superior. The method of operating the power train varies depending on the transmission gear ratio, and thus the power train can be operated with superior efficiency.

Abstract: A power train for hybrid vehicles increases the range of the transmission gear ratio within which the efficiency of the power train is superior. Furthermore, the method of operating the power train varies depending on the transmission gear ratio, and thus the power train can be operated with superior efficiency.

Abstract: A power train for hybrid vehicles increases the range of the transmission gear ratio within which the efficiency of the power train is superior. Furthermore, the method of operating the power train is varied depending on the transmission gear ratio, so that the power train can be operated with superior efficiency.