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Kinematics and nonlinear control of an electromagnetic actuated CVT system for passenger vehicle
Ataur Rahman,Sazzad Bin Sharif,Altab Hossain,A. K. M. Mohiuddin,A. H. M. Zahirul Alam 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.7
An electromagnetic actuated continuously variable transmission (EMA-CVT) system is developed by two sets of electromagnetic actuators (solenoid) located on primary and secondary pulley. A set of solenoids are attached to the primary and secondary pulley to develop the attraction and repulsive forces. The relationships between the speed ratio and electromagnetic actuation and clamping force and output torque of the CVT are established based on the kinematics of the EMA-CVT system. A fuzzy logic controller (FLC) is developed to control the EMA precisely based on the feedback of the RPM sensor and slope sensor. The EMA-CVT performance with controller has found 28% more than the performance of the EMA-CVT without controller. The solenoids of the EMA were activated by varying the current supply with the Fuzzy-Proportional-Derivative-Integrator (FPID) to maintain the non-linearity of the CVT in response of the vehicle traction torque demand. Result shows that the solenoid is able to pull the plunger in the desired distance with supply current of 12.5 amp while push the plunger to the desired distance with 14.00 amp current supply to the windings when the vehicle is considered in 10% grade. The acceleration time of the ¼ scale car has been recorded as 5.5 s with the response of drive wheels torque.
Energy efficient electromagnetic actuated CVT system
Ataur Rahman,Sazzad Bin Sharif,A.K.M. Mohiuddin,Mahbubur Rashid,Altab Hossain 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
A continuously variable transmission (CVT) system transmits the engine/battery power to the car driving wheel smoothly and efficiently. Several types of CVT already been developed to improve the transmission losses while maintaining acceleration time. However,most of the CVT has some constraints in the actuation mechanism which led us to develop an innovative electromagnetic actuator forCVT. Simplified mathematical equations have been developed for the kinematics analysis of clamping forces of the CVT and electromagneticforces of EMA. The EMA has been developed for ¼ scale car with two sets of solenoid. Each of the two sets has been equippedwith primary and secondary pulleys for pushing and pulling the movable sheave. The solenoid is operated by controlling the supply currentwith a fuzzy logic controller. A simulation based fuzzy logic controller has been introduced here for identifying the desired current ofthe EMA actuation. The experimental results show that the EMA develops electromagnetic forces 301 N for the supply current of 3.37amp, which makes the acceleration time of the car in the range of 2.5~3.5 sec and electromagnetic actuated CVT system highly energyefficient.