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Frequency and time domain characteristics of digital control of electric vehicle in-wheel drives

Jarzebowicz L., Opalinski A.

Archives of Electrical Engineering

2017

Vol. 66, nr 4

829--842

In-wheel electric drives are promising as actuators in active safety systems of electric and hybrid vehicles. This new function requires dedicated control algorithms, making it essential to deliver models that reflect better the wheel-torque control dynamics of electric drives. The timing of digital control events, whose importance is stressed in current research, still lacks an analytical description allowing for modeling its influence on control system dynamics. In this paper, authors investigate and compare approaches to the analog and discrete analytical modeling of torque control loop in digitally controlled electric drive. Five different analytical models of stator current torque component control are compared to judge their accuracy in representing drive control dynamics related to the timing of digital control events. The Bode characteristics and stepresponse characteristics of the analytical models are then compared with those of a reference model for three commonly used cases of motor discrete control schemes. Finally, the applicability of the presented models is discussed.

A practical approach in the thermodynamical analysis of the TDI - process

Willmann M., Vanhaelst R., Opalinski A.

Journal of KONES

2001

Vol. 8, No. 1-2

35-44

High speed diesel engines have been developed intensively in the past few years.The customers relevant engine performance data as: bmep, fuel consumption, exhaust and noise emissions have been improved. To reach all objectives in time, all affords of designers and scientists with the aid of a modern development will be necessary. This paper deals with new methods and theories in the thermodynamical analysis of the TOI engine, which need a cylinder indicating pressure, optical measurements and new calculation models. To evaluate the rate of heat-release, which is introduced into the 2-zone-model, the measured cylinder pressure has to be adjusted. With the aid of a new procedure the absolute level of the measured pressure can be determined. In addition to that an improved method for evaluation of the cylinder-mass in the EGR-mode will be presented. The combination of the calculated rate of heat - release and measured values from the test cell like the composition of exhaust gas will be read into a new theory of two zones. The concentration of NO and soot will be calculated in dependence of the crank angle and verified by optical measurements. The goal of this research work is to reduce the exhaust gas emissions through a better understanding of the internal combustion process. With the so obtained results it would be able to modify engine control and design. The report about the use of the new methods and theories during thermodynamic analysis at the TDI-research will be continued.