A state of charge estimation device includes a memory section, a measurement section, a time measurement section, and an estimation section. The memory section memorizes a specified dark current, which flows at an auxiliary battery while the vehicle is parked, and a first state of charge at a most recent time the vehicle was parked before being started. The measurement section measures an open circuit voltage. The time measurement section measures an elapsed time from the time the vehicle was parked to the time it is started. The estimation section updates the specified dark current memorized in the memory section such that a second state of charge approaches a third state of charge. If the open circuit voltage is in a first region, the estimation section estimates a state of charge on the basis of the first state of charge, the specified dark current, and an elapsed time.
State of charge estimation device
2021-10-19
Patent
Elektronische Ressource
Englisch
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