Study of the range of stepless change of the gear ratio of dual mode hybrid drives.

This paper discusses the propulsion of hybrid cars with an internal combustion engine and two electric machines that form the so-called power-split transmission. The object of study are variants of such transmissions, which provide two modes of operation – with simple separation and with double separation of power. The task is to study the range of change of the gear ratio from the internal combustion engine to the drive wheels depending on the parameters of the mechanical and electrical part. In the mechanical part two or three ordinary planetary sets are used and it is possible to see how their design parameters (the ratio of the number of teeth of the central gears) affect the range, and in the electrical part – the range of rotation speed of the electrical machines. The results are illustrated through a graphical method for the analysis of planetary mechanisms. [ABSTRACT FROM AUTHOR]