US 12,391,121 B2
Vehicular power supply system
Akihiko Ito, Kariya (JP); Akira Sumi, Kariya (JP); Yasuhito Tanabe, Kariya (JP); and Dachao Wang, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Feb. 26, 2024, as Appl. No. 18/586,737.
Application 18/586,737 is a continuation of application No. PCT/JP2022/030778, filed on Aug. 12, 2022.
Claims priority of application No. 2021-136438 (JP), filed on Aug. 24, 2021.
Prior Publication US 2024/0190252 A1, Jun. 13, 2024
Int. Cl. B60L 3/04 (2006.01); B60L 3/00 (2019.01); B60L 58/12 (2019.01); B60L 58/19 (2019.01); H02J 7/00 (2006.01); H02J 7/34 (2006.01)
CPC B60L 3/04 (2013.01) [B60L 3/0046 (2013.01); B60L 3/0084 (2013.01); B60L 58/12 (2019.02); B60L 58/19 (2019.02); H02J 7/0024 (2013.01); H02J 7/0048 (2020.01); H02J 7/0063 (2013.01); H02J 7/00712 (2020.01); H02J 7/345 (2013.01); B60L 2240/549 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A vehicular power supply system including a sensor unit that detects a battery state of a storage battery that is capable of supplying electrical power to an electrical load, and a control unit that receives the battery state from the sensor unit via a communication path and performs instruction to perform energization and interruption of the energization between the storage battery and the electrical load based on the received battery state, wherein
the sensor unit includes:
a detection unit that detects the battery state of the storage battery;
a switch drive unit that performs drive control of a switch unit provided between the storage battery and the electrical load; and
a control unit that controls the switch drive unit,
the control unit controls the switch drive unit based on the instruction from the control unit to switch between the energization and interruption of the energization between the storage battery and the electrical load,
if determining an abnormality in the control unit or the communication path, the control unit determines whether to maintain the energization between the storage battery and the electrical load based on the battery state detected by the detection unit and controls the switch drive unit based on the determination to switch between the energization and interruption of the energization between the storage battery and the electrical load,
the detection unit includes a first current detection unit that detects a first current value at a first point on an electrical path between the storage battery and the electrical load and a second current detection unit that detects a second current value at a second point different from the first point on the electrical path,
if the first current value is a first threshold value or greater and the second current value is a second threshold value or greater, the switch drive unit performs drive control of the switch unit to interrupt the energization between the storage battery and the electrical load, and
if the number of times the first current value is the first threshold value or more is a predetermined first number of times or more and if the number of times the second current value is the second threshold value or more is a second number of times, which is different from the first number of times, or more, the switch drive unit performs drive control of the switch unit to interrupt the energization between the storage battery and the electrical load.