an electrically controlled speed governor motor referring to fig6 to fig8 the non step speed changer 4 of the present invention may be formed by connection of a planetary gear set or a differential gear set which will be illustrated as follows 1 planetary gear set the planetary gear non step speed changer may be classified into two categories the first one makes use of the output power of the power allotment unit 3 as its input the second one uses the power produced by forward and reverse rotation of the dynamo 1 motor generator as an input with this scheme the power output from the output shaft of the planetary gear set will be able to maintain the engine 2 working at the most preferable region at any different roadway condition and vehicle speed see fig5 c by connecting the input side to the sun gear the output side to the planet gear and the supporting bracket of the planetary gear set is connected to the motor 11 by connecting the input shaft the motor 11 and the output shaft in different positions according to the characteristic motion of the planetary gear set represented by the formula ns u03b1ns u2212 1 u03b1 nc 0 there may be six possible arrangements shown in fig6 a to fig6 f 2 differential gear set as shown in fig7 there are two kinds of input power the first one makes use of the output power of the power allotment unit 3 as its input the second one uses the power produced by forward and reverse rotation of the dynamo 1 motor generator to control the performance.