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Range-extender In-the-loop Method for Fuel Consumption Prediction of Hybrid Electric Vehicles

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Abstract

In the development of a range-extended electric vehicle, it is necessary to determine the control strategy of the range extender (REX) and evaluate the influence of its performance and operating conditions. In this paper, we propose a range-extender in-the-loop (REIL) method that is used to predict the vehicle fuel consumption more accurately. To develop the REIL method and perform experimental verification, the vehicle plant model, electric-drive control strategy, and REX control strategy are integrated into a vehicle control unit (VCU) for REX control, bench data acquisition, and bench monitoring. The VCU controls the REX to meet the power requirements of the simulated vehicle operations under a given driving cycle. The fuel consumed by the engine and power generated by the integrated starter-and-generator are measured during the tests, which are used in the vehicle fuel consumption calculation. We first describe the methodology and implementation of the REIL, and subsequently discuss the predicted results of a range-extended electric vehicle equipped with a 30 kW REX under the WLTC driving cycle. Comparing the predicted results of the REIL and software simulation methods, it is demonstrated that the REIL method improves the prediction accuracy of vehicle fuel consumption.

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Abbreviations

BMS:

battery management system

CCP:

CAN calibration protocol

CD:

charge depleting

CS:

charge maintaining

ECMS:

equivalent consumption minimization strategy

ECU:

engine control unit

ESFC:

electric-power specific fuel consumption

GCU:

generator control unit

HIL:

hardware-in-loop

ISG:

integrated starter-and-generator

TM:

traction motor

MCU:

motor control unit

MIL:

model-in-loop

PHEV:

plug-in hybrid electric vehicle

PID:

proportion integration differentiation

REEV:

range-extended electric vehicle

REIL:

range extender in-loop

REX:

range extender

SOC:

state of charge

VCU:

vehicle control unit

VFC:

vehicle fuel consumption

WLTC:

worldwide harmonized light vehicles test cycle

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Acknowledgement

This work is supported by funding from Tongji University (No. 17092450110) and from Nanchang Automotive Innovation Institute (No. 17002380039).

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Authors and Affiliations

  1. School of Automotive Studies, Tongji University, Shanghai, 201804, China

    Yongzheng Sun, Zhiyu Han, Jian Feng & Zhenkuo Wu

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  1. Yongzheng Sun
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  2. Zhiyu Han
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  3. Jian Feng
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  4. Zhenkuo Wu
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Correspondence to Zhiyu Han.

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Sun, Y., Han, Z., Feng, J. et al. Range-extender In-the-loop Method for Fuel Consumption Prediction of Hybrid Electric Vehicles. Int.J Automot. Technol. 24, 91–103 (2023). https://doi.org/10.1007/s12239-023-0009-6

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  • DOI: https://doi.org/10.1007/s12239-023-0009-6

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