Kabushiki Kaisha Toyota Jidoshokki

Kazuhiro Niimura

Kenji Nishigaki

Satoshi Yamamoto

Yusuke Tsutsui

Junichi Hatano

Shinji Hirose

Mamoru Kuraishi

Tomoyuki Ito

An abnormality diagnostic for a MOSFET switch element in a rechargeable battery pack for determining a short circuit abnormality (fusion) in a MOSFET switch element that causes a charge current to flow in. An on/off controller turns off a MOSFET causing a charge current to flow into a battery module, a start-of-charge instruction unit transmits to a charger an instruction signal to start a charging operation, and a short circuit abnormality diagnostic unit determines, based on a current sensor output, whether current is flowing through the MOSFET due to the charging operation to diagnose a short circuit abnormality in the MOSFET. After diagnosis of the MOSFET, a diagnosis of a short circuit abnormality in a MOSFET that causes a discharge current to flow out of the battery module is performed, and then a diagnosis of a short circuit abnormality in a charge relay is performed.

Abnormality diagnostic device and abnormality diagnostic method for MOSFET switch element

Growing community of inventors

Kariya, Japan

Kazuhiro Niimura