“…[3], [4] Also industries try to find other systems for efficiency such as CVT (Continuously Variable Transmission) to be able to control engine speed on the optimal operation line. [5] In addition, hydrogen and electric vehicles have been developed and become wide spread as alternative conventional one with emissions of carbon dioxide (CO2) which causes greenhouse gas. [6], [7] Despite these efforts, however, these studies are hard to apply in most vehicles because of high cost to develop new material or limit of structural problems.…”