US 12,441,194 B2
Detecting an impedance abnormality in a charging path
Yamato Niwa, Kariya (JP); Toshihiko Minamii, Nisshin (JP); Toru Ando, Obu (JP); Yu Shimizu, Nagakute (JP); and Toshiki Miyazaki, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 15, 2022, as Appl. No. 18/081,891.
Claims priority of application No. 2022-017876 (JP), filed on Feb. 8, 2022.
Prior Publication US 2023/0302912 A1, Sep. 28, 2023
Int. Cl. B60L 3/04 (2006.01); B60L 53/16 (2019.01); B60L 53/18 (2019.01)
CPC B60L 3/04 (2013.01) [B60L 53/16 (2019.02); B60L 53/18 (2019.02)] 9 Claims
OG exemplary drawing
 
1. A vehicle configured such that an on-board battery is chargeable by receiving electric power supplied from a power supply outside the vehicle via a charging cable, the vehicle comprising:
an inlet to which a connector of the charging cable is connectable;
a voltage sensor configured to detect an input voltage that is a voltage input from the power supply to the inlet; and
an electronic control unit configured to execute a detection process in a state in which the connector is connected to the inlet, wherein the detection process includes:
acquiring a first voltage that is the input voltage before a start of a charging;
starting the charging after acquiring the first voltage;
acquiring a second voltage that is the input voltage after the start of the charging;
calculating a first difference between the first voltage and the second voltage, and when the first difference is equal to or larger than a threshold value, suspending the charging;
acquiring a third voltage that is the input voltage during the suspension of the charging;
resuming the charging after acquiring the third voltage;
acquiring a fourth voltage that is the input voltage after the resumption of the charging;
calculating a second difference between the third voltage and the fourth voltage, and when the second difference is equal to or larger than the threshold value, stopping the charging;
determining an impedance abnormality in a charging path has occurred when the second difference is equal to or larger than the threshold value; and
when the second difference is smaller than the threshold value, determining that the first difference is equal to or larger than the threshold value is due to a decrease in the system voltage,
wherein the threshold value is prestored based on a rated current of the charging cable and is dynamic based on a rated current provided by the power supply, a map is prestored to indicate a relationship between the threshold value and the rated current, the threshold value is set based on checking the rated current against the map.