Analogy considerations for the design of hybrid drive trains

Autoren

Michael Auerbach, Oliver Zirn, Hochschule Esslingen

Jahr

2019

Zusammenfassung

Development engineers for hybrid drive chains need a suitable understanding of the application of the internal combustion engine (ICE) as well as the electric motor (EM) subsystem. The actual literature in applied textbooks consider EM’s from the perspective of the electrical machine developer with emphasis on the magnetic circuit, winding techniques and power electronic control. In theoretical literature, EM’s are treated on a quite abstract and analytical level (flux linkage and field-oriented control) for the electrical engineer. This makes it difficult for developers coming from classic automotive engineering to accomplish a deeper understanding of electric drives.
Based on the analogy of mean effective pressure in the combustion chamber and magnetic surface thrust in the air gap, however, a multi-physical similarity over the displacement and the rotor volume, the torque and the power can be shown along with losses between the subsystems. Based on the classic input values in the fuel tank (caloric value and fuel volume flow), the developer can thus develop a better understanding of the electrochemical energy storage and of the electrical quantities traction voltage and battery current. Mechanical / electro-technical equivalents also exist for the combustion engine-specific mechanical / flow-dynamic limitations, which are explained
below.

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