On-vehicle power supply system and a state detecting method for battery contained in on-vehicle power supply system
US10889187B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2017 |
| Grant date | Jan 12, 2021 |
| Priority date | — |
| Expiry date | Jan 14, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle-mounted power supply system according to the present invention is provided with: a main battery; a sub-battery; a voltage regulating unit which regulates the voltage of power supplied from the main battery and the sub-battery; and a state detecting unit which detects the state of the sub-battery. The state detecting unit is provided with: a first calculating unit which calculates a first internal resistance on the basis of a drop in the voltage across the sub-battery and an inrush current when the sub-battery supplies power to a load; a second calculating unit which manipulates the voltage regulating unit immediately following the calculation of the first internal resistance, and subsequently at least one more time, to cause the sub-battery to be forcibly discharged, and calculates a second internal resistance on the basis of a relationship between the voltage across the sub-battery and the current flowing thereinto when forcibly discharged; and a state determining unit which determines the state of the sub-battery on the basis of the first internal resistance and changes in the second internal resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.