Patent ID: 8006788
Filing Date: 2011-08-30
Classification: B60L,Y02T

Abstract:
1. A maximum output setting device that sets a maximum output of a capacitor, the maximum output setting device comprising: a state detecting unit that detects a state of the capacitor including a voltage, an electric current, and temperature of the capacitor; a voltage-resistance calculating unit that calculates an open-circuit voltage and an internal resistance of the capacitor on the basis of at least the voltage, the electric current, and the temperature included in the state of the capacitor detected; a maximum-output calculating unit that calculates three maximum outputs including a maximum output due to a maximum current, which can be outputted from the capacitor, calculated on the basis of an allowable maximum current of the capacitor from the open-circuit voltage and the internal resistance calculated and an allowable lower limit voltage of the capacitor, a maximum output due to an open-circuit voltage, which can be outputted from the capacitor, calculated on the basis of the open-circuit voltage calculated and an open-circuit lower limit voltage applied to the capacitor, and a maximum output due to a capacitor voltage, which can be outputted from the capacitor, calculated on the basis of the voltage of the capacitor detected and the allowable lower limit voltage of the capacitor; and an execution maximum output setting unit that sets a smallest maximum output of the calculated three maximum outputs as an execution maximum output of the capacitor; and wherein the maximum-output calculating unit is a unit that performs three calculations of a maximum output including a calculation for setting an electric current obtained by dividing a difference between the calculated open-circuit voltage and the allowable lower limit voltage by the calculated internal resistance as the maximum current and setting an output calculated by multiplying the maximum current with the allowable lower limit voltage as the maximum output due to a maximum current, a calculation for setting an output calculated by dividing a difference between a square of the calculated open-circuit voltage and a square of the open-circuit lower limit voltage by the calculated internal resistance as the maximum output due to an open-circuit voltage, and a calculation for setting an output calculated by dividing a difference between a square of the detected voltage of the capacitor and a square of the allowable lower limit voltage by the calculated internal resistance as the maximum output due to the capacitor voltage.