Abstract

In this paper, a motor-generator (MG) control algorithm was proposed to improve the shift quality for a dual mode power split transmission (PST) hybrid electric vehicle (HEV). In order to analyze the shift characteristics during the mode shift, Bondgraph models for transient-state were constructed and state equations were derived. From the state equations, it was found that inertia torque of MG2 causes a transient torque during the mode shift. Based on the transient torque, a MG torque control algorithm which compensates the transient torque was developed to reduce the driveshaft torque variation. To evaluate the performance of the MG2 control algorithm, dynamic models of the dual mode PST HEV were obtained and an AMESim-MATLAB/Simulink based mode shift performance simulator was developed. It was found from the simulation results that the driveshaft torque variation was reduced by the proposed control algorithm which provides improved shift quality.

Highlights

  • A power split type hybrid electric vehicle (HEV) transmits power through the power split transmission (PST) which consists of electrical path and mechanical path

  • The dual mode PST under study has four cases of mode shifts: 1)from EV to input split mode; 2)from input split to compound split mode; 3)from compound split to input split mode, 4)from compound split to EV mode

  • In the dual mode PST under study, MG1 is responsible for the optimal engine operation

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Summary

Introduction

A power split type hybrid electric vehicle (HEV) transmits power through the power split transmission (PST) which consists of electrical path and mechanical path. In this type, a power circulation which occurs at high speed has been pointed out as a main drawback [2]. A power circulation which occurs at high speed has been pointed out as a main drawback [2] To solve this problem, a dual mode PST , wherein the clutch and brake are used for the mode shift, has been investigated for ensuring high efficiency both at high and low speed [3,7]. Performance of the proposed control algorithm is EVS27 International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium. The second case, 2)from input split to compound split mode, is investigated

Structure of dual mode power split transmission
Transient-state model for mode shift
MG1 control
MG2 control
Mode shift performance simulator for dual mode PST
Simulation results
Conclusions
Full Text
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