Power source control unit
AssigneeDENSO TEN Limited
InventorYasunori Kozuki
Life of this patent
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Abstract
A power source control unit is for controlling a switch that makes connection between a first power line and a second power line, a first system load being connected to a first power source through the first power line, a second system load being connected to a second power source through the second power line, wherein the power source control unit includes: an SOC acquisition portion as defined herein; a first SOC determination portion as defined herein; a second SOC determination portion as defined herein; a failure determination portion as defined herein; and a switch control portion as defined herein.
Claims6
A power source control unit for controlling a switch that makes connection between a first power line and a second power line, a first system load being connected to a first power source through the first power line, a second system load being connected to a second power source through the second power line, the power source control unit comprising:
- a processor configured to:
- acquire a power source current value from a current sensor that measures a current flowing through a section between the first power source and a first connection portion in the first power line, the first connection portion connecting the first power line to a wiring connected to the switch;
- determine whether the second power source is supplying a current to the first power source or not, based on the power source current value;
- determine that the first power source is grounded when a determination is made that the second power source is supplying the current to the first power source;
- turn the switch off when a determination is made that the first power source is grounded;
- acquire a state of charge value of the second power source;
- compare the state of charge value with a first threshold so as to determine whether the second power source can supply predetermined power to the second system load for a predetermined time or not;
- determine whether the state of charge value has decreased to be lower than a second threshold or not when a determination is made that the second power source can supply the predetermined power to the second system load for the predetermined time, the second threshold being higher than the first threshold;
- determine that the first power source failed when a determination is made that the state of charge value is lower than the second threshold;
- and
- turn the switch off when a determination is made that the first power source failed.
A power source control method for controlling a switch that makes connection between a first power line and a second power line, a first system load being connected to a first power source through the first power line, a second system load being connected to a second power source through the second power line, the method comprising:
- acquiring a power source current value from a current sensor that measures a current flowing through a section between the first power source and a first connection portion in the first power line, the first connection portion connecting the first power line to a wiring connected to the switch;
- determining whether the second power source is supplying a current to the first power source or not, based on the power source current value;
- determining that the first power source is grounded when a determination is made that the second power source is supplying the current to the first power source;
- turning the switch off when a determination is made that the first power source is grounded;
- acquiring a state of charge value of the second power source;
- comparing the state of charge value with a first threshold so as to determine whether the second power source can supply predetermined power to the second system load for a predetermined time or not;
- determining whether the state of charge value has decreased to be lower than a second threshold or not when a determination is made that the second power source can supply the predetermined power to the second system load for the predetermined time, the second threshold being higher than the first threshold;
- determining that the first power source failed when a determination is made that the state of charge value is lower than the second threshold;
- and
- turning the switch off when a determination is made that the first power source failed.
Dependencies are inferred from the claim text.