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Control Strategy for an Electromechanical Transmission Vehicle Based on a Double Markov Process

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Abstract

Based on an analysis of the driving demand and system dynamics of heavy-duty vehicles equipped with electromechanical transmission (EMT), a double Markov model is put forward to represent drivers’ power demand for driving and electricity. Transfer probability matrices are calculated by utilizing the maximum likelihood estimation method. A power distribution control strategy based on stochastic dynamic programming (SDP) is proposed. With economy being the optimization goal, the model for power allocation control based on SDP is established while regarding the engine torque, motor speeds, vehicle speed and state of charge (SOC) as state variables’ engine speed and motor torques as control variables’ and power demands as interference variables. The SDP problem is solved by an improved policy iteration algorithm based on value iteration and policy iteration algorithms.

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Acknowledgement

This work was supported by Program for New Century Excellent Talents in University (NCET-12-0048) and National Natural Science Foundation of China under contract (NSFC PROGRAM, No. 51775040).

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Correspondence to Lijin Han.

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Liu, H., Xu, R., Han, L. et al. Control Strategy for an Electromechanical Transmission Vehicle Based on a Double Markov Process. Int.J Automot. Technol. 22, 761–770 (2021). https://doi.org/10.1007/s12239-021-0069-4

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  • DOI: https://doi.org/10.1007/s12239-021-0069-4

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