초록 ▼

While a power source is being supplied from a sub-battery by a voltage-current change trend calculating section, the voltage-current change trend calculating section collects currents from a battery and terminal voltages. A voltage-current approximate straight line calculating section obtains an app

While a power source is being supplied from a sub-battery by a voltage-current change trend calculating section, the voltage-current change trend calculating section collects currents from a battery and terminal voltages. A voltage-current approximate straight line calculating section obtains an approximately linear function, and a battery residual capacity calculating section obtains a residual capacity voltage based upon the approximately linear function and open-circuit voltages. A current storage stop discriminating section integrates the currents while the residual capacity voltage is lower than a previous residual capacity voltage, and when supplying from the sub-battery is stopped, obtains total capacity according to the open-circuit voltages at the stop and supplying and according to the integrated currents.

대표청구항 ▼

[ What is claimed is:] [1.] A battery residual capacity measuring apparatus, comprising:a voltage-current change trend calculating section for while a battery is supplying power, collecting currents from the battery and terminal voltages of the battery;a voltage-current approximate straight line cal

[ What is claimed is:] [1.] A battery residual capacity measuring apparatus, comprising:a voltage-current change trend calculating section for while a battery is supplying power, collecting currents from the battery and terminal voltages of the battery;a voltage-current approximate straight line calculating section for while the battery is supplying power, calculating an approximately linear function based upon the collected currents and the terminal voltages;a battery residual capacity calculating section for measuring open-circuit voltages of the battery when the battery starts or stops supplying power so as to calculate and display a residual capacity according to a residual capacity voltage based upon the approximate linear function, and according to a total current capacity of the battery while the battery is supplying power; anda current storage stop discriminating section for, only while the residual capacity voltage is lower than a previous residual capacity voltage, integrating the currents so as to obtain and store the total current capacity according to the open-circuit voltage measured when the battery stops supplying power, and according to the open-circuit voltage due to the integrated currents and due to the start of supplying the power when the supply of power is stopped.