Development of a Lead–Acid Battery Model for Automotive Simulation
The evolution of mobility, that is, the pursuit of high safety, low environmental impact, high comfort, etc., is supported by the innovation of advanced control technology. A model-based development is considered an effective method to verify the complicated control technology more comprehensively and quickly. Since the battery is also an important part of the automotive control system, a highly reliable battery model is essential for the development of the system. An equivalent-circuit model for the lead–acid battery has been disclosed by the Society of Automotive Engineers of Japan, Inc. (JSAE) that can simulate the charge and discharge behaviour of a battery. This model, however, only contains parameters obtained from limited battery behaviour and therefore sufficient accuracy cannot be obtained depending on the simulation conditions. This presentation describes the development of an improved version of the JSAE model in which newly acquired battery characteristics are reflected to improve the accuracy of the estimated charge and discharge behaviour. To achieve this objective,
two characteristics of battery were targeted, namely: (i) the behaviour of the current and voltage immediately after charge and discharge and (ii) the changes in polarization as the battery approaches full charge or discharge. As a result, for the relatively frequent charge –discharge control pattern based on urban driving, it has been confirmed that the estimated accuracy of voltage, current and integrated current transitions is improved.
Katsuyuki Sato holds a Master’s degree in electrical engineering from the Tokyo University of Science. He Immediately joined the Technical Development Division of GS Yuasa International Ltd. in April 2012. Katsuyuki is currently conducting research directed towards the development of both a high-performance battery for start–stop vehicle systems and the lead–acid battery model.