Abstract
The system presented in this paper allows the direct transfer of kinetic energy of a vehicle’s motion to a flywheel and vice-versa. For braking, a cable winds onto a pulley geared to the vehicle’s propulsion driveshaft as it unwinds from another pulley geared to the flywheel and then operates in reverse for the transfer of energy in the opposite direction. The cable windings are in one plane resulting in an effective pulley radius that increases when the cable is winding onto it and decreases when unwinding from it. Thus, an increasing driven-to-driving pulley velocity ratio is obtained during a period of energy transfer in either direction. A dynamic analysis simulating the process was developed. Its application is illustrated with a numerical solution based on specific assumed values of system parameters.
Highlights
Flywheel energy storage is an appealing and much studied concept that has failed to compete with battery storage in hybrid vehicles
The means for transferring the kinetic energy of the vehicle’s motion to the flywheel in the proposed arrangement is a cable that winds onto a pulley geared to the vehicle’s propulsion driveshaft as it unwinds from another pulley geared to the flywheel and operates in reverse for the transfer of energy in the opposite direction
One obvious limitation is that the vehicle’s acceleration/deceleration provided by the system at any moment depends only on the vehicle’s velocity and flywheel speed and cannot be varied at will
Summary
Flywheel energy storage is an appealing and much studied concept that has failed to compete with battery storage in hybrid vehicles. A conceptually simple means of transferring the kinetic energy due to a vehicle’s motion to a flywheel and transferring it back to accelerate the vehicle, is based on a continuously variable transmission (CVT) whose speed ratio is varied to. The range of speed ratios of a CVT is rather limited and may not permit matching the ratio required when engaging the clutches causing slip and power loss To solve this problem, gear shifts may be introduced [4]. An elaborate scheme is to introduce means to accelerate or decelerate the flywheel prior to engaging the clutches to bring the speed ratio required of the CVT to within its capability [5] resulting in the addition of a secondary energy storage, such as batteries, and the need for conversion of energy from one form to another. It lacks flexibility with respect to torque control, it has the virtue of simplicity
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