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Conditioning Procedure for HEV's Batteries Applied to Different Emissions and Fuel Economy Cycles
Technical Paper
2012-36-0493
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The automobile industry has developed and marketed hybrid electric vehicles (HEV) internationally for over 10 years. The presence of batteries in these vehicles poses difficulties for their approval in laboratory trials. The difference between the initial and final battery state of charge changes the energy balance measured in the tests, affecting the emissions and fuel economy levels. Two proposals have emerged to address this problem. One is described in ISO 23274, which consists in determining and applying a correction factor to the emissions and fuel economy results. This factor is based on the difference between the initial and final battery state of charge after the test. The other is described by SAE J1711 which consists in conditioning the battery, in order to equal the state of charge level at the end and start of the test, avoiding the factor recalculation. The main objective of this paper is to study the energy flow in the batteries during the tests and, based on this study, to propose a new procedure for its conditioning. The SAE J1711 proposes the resumption of the old proposal FTP75 cycle with four stages in order to condition the battery. However, it is possible, also, to achieve the same effect using other cycles. In addition to theoretical studies, experimental tests were performed with three hybrid electric vehicles using FTP75 cycle (three phases) and European cycle ECE-1505.
Authors
Citation
Botero, S., dos Santos, K., de Carvalho, R., and de Melo, T., "Conditioning Procedure for HEV's Batteries Applied to Different Emissions and Fuel Economy Cycles," SAE Technical Paper 2012-36-0493, 2012, https://doi.org/10.4271/2012-36-0493.Also In
References
- INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. ISO 23274 Hybrid - Electric Road Vehicles - Exhaust Emissions and Fuel Consumption Measurements - Non-Externally Chargeable Vehicles Switzerland June 2007
- SOCIETY OF AUTOMOTIVE ENGINEERS SAE J1711: Recommended Practice for Measuring the Exhaust Emission and Fuel Economy of Hybrid-Electric Including Plug-in Hybrid Vehicles EUA June 2010
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