Author
Abstract
This work presents proposed design of a parallel hybrid transmission with only one electric motor/generator (MG) and without any rotating clutches. The proposed motor/generator integrated hybrid transmission serves to regulate the engine's effective gear ratio (engine rotational velocity versus vehicle velocity) by mixing the engine and electric MG powers through a power controlling device. The proposed design provides some of the benefits and flexibility of a power-split design but using conventional available components in a simpler mechanical layout that makes the design compact, mechanically simple, and operationally flexible. With a control unit, four major modes of operation excluding a regenerative braking capability are shown to be feasible in the proposed hybrid transmission; electric motor mode, engine mode, engine/charge mode, and power modes. Continuously variable transmission (CVT) capability is provided with the engine/charge mode and with the power mode. The power mode can be further subdivided into three hybrid sub-modes that correspond to the direct drive, under-drive, and over-drive of a conventional automatic transmission.
The feasibility of the proposed hybrid transmission is demonstrated with a numerical example employing a simple gear train. In this work a controller is designed to vary the speed of the vehicle for different driving conditions. All basic driving conditions for a car are studied and identified. The new controller is implemented by using fuzzy logic and simulated in MATLAB/ Simulink.
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