Advances in Mechanical and Manufacturing Engineering: by Zamir A. Zulkefli, Mohd Sapuan Salit, Suraya Mohd Tahir,

By Zamir A. Zulkefli, Mohd Sapuan Salit, Suraya Mohd Tahir, Yousuf El-Shekeil, Mohamad Ridzwan Ishak

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Jaisuk1,b, P. Jirawattana1,c and T. th Keywords: Engine map; CVT powertrains; Optimal operation; Drive ability mode Abstract. Rising fuel costs increase the importance of CVT powertrains in the automotive industry. Their benefit is that they allow an engine to operate at any condition which motivates development of fuel economy mode control strategies. In this work, an engine map is multiplied by the efficiency of a hydrostatic continuously variable transmission (HCVT). Therefore, the map is pictured in a 3D Cartesian space which is functioned into 3 parameters of indicated engine torque, engine speed, and transmission ratio.

Fig. 3 shows current gear configuration of remote controlled cars. Within the transmission system, includes gear meshes from two pinion and spur gears respectively, driving and driven shafts, two clutches, bearings and the transmission mounting. One way clutch and ball bearing are selected in this design because reverse motion is not includes in the new transmission design. All these spare parts can be purchased from shops. Fig. 3: Top view of current transmission gear configuration. Fig. 4: Top view of transmission system after improvement Applied Mechanics and Materials Vol.

564 29 With reference to table adding a third gear, the speed of vehicle is able to improve within a range of 27% to 84% due to the ability of clutch to store potential energy and impulsive transfer of inertia to the gears. 2 The maximum speed of wheel is limited at approximately 210 km/h which is roughly 16278 rpm. (See Fig. 9) As compared to the maximum angular velocity of motor, which is roughly 30000 rpm, this indicates that there is loss of energy during transmission of torque from the car motor to its wheel.

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