Power supply device, input-output limit setting method in power supply device, vehicle, and vehicle power control method

A vehicle, comprising:

• a driving source configured to output power to a driveshaft linked with an axle of the vehicle;
• a motor configured to input and output power from and to the driveshaft;
• an accumulator designed to be chargeable and dischargeable and arranged to enable transmission of electric power from and to the motor;
• a temperature sensor constructed to measure temperature of the accumulator;
• a charge-discharge current meter constructed to measure a charge-discharge current to be charged into or discharged from the accumulator;
• a state-of-charge calculator configured to compute a state of charge as an indication of an amount of electric power dischargeable from the accumulator, based on the measured charge-discharge current;
• an input limit setter configured to set a basic input limit, as a maximum allowable electric power to be charged into the accumulator, according to the computed state of charge and the measured temperature, correct the set basic input limit based on the measured charge-discharge current, and set the corrected basic input limit to an effective input limit;
• an output limit setter configured to set an effective output limit, as a maximum allowable electric power to be discharged from the accumulator, according to the computed state of charge and the measured temperature;
• a square current calculator configured to compute a time average of square values of the measured charge-discharge current;
• and
• a controller configured to control the driving source and the motor to charge and discharge the accumulator in a range defined by the set effective input limit and the set effective output limit.

An input-output limit setting method in a power supply device equipped with a chargeable and dischargeable accumulator and constructed to input and output electric power, the input-output limit setting method setting an effective input limit as a maximum allowable electric power to be charged into the accumulator and setting an effective output limit as a maximum allowable electric power to be discharged from the accumulator,

• the input-output limit setting method comprising:
• computing a state, of charge as an indication of an amount of electric power dischargeable from the accumulator, based on a measured charge-discharge current to be charged into or discharged from the accumulator;
• setting a basic input limit, as the maximum allowable electric power to be charged into the accumulator, according to the computed state of charge and a temperature of the accumulator, correcting the set basic input limit based on the charge-discharge current, and setting the corrected basic input limit to the effective input limit;
• setting the effective output limit, as the maximum allowable electric power to be discharged from the accumulator, according to the computed state of charge and the temperature of the accumulator;
• and
• computing a time average of square values of the measured charge-discharge current.

A vehicle control method for controlling a vehicle, the vehicle comprising:

• a power supply device equipped with a chargeable and dischargeable accumulator and constructed to input and output electric power;
• a driving source configured to output power to a driveshaft linked with an axle of the vehicle;
• and a motor configured to enable transmission of electric power to and from the power supply device and to input and output power from and to the driveshaft,
• the vehicle control method comprising:
• computing a state of charge as an indication of an amount of electric power dischargeable from the accumulator, based on a measured charge-discharge current to be charged into or discharged from the accumulator;
• setting a basic input limit, as a maximum allowable electric power to be charged into the accumulator, according to the computed state of charge and a temperature of the accumulator, correcting the set basic input limit based on the charge-discharge current, and setting the corrected basic input limit to an effective input limit;
• setting an effective output limit, as a maximum allowable electric power to be discharged from the accumulator, according to the computed state of charge and the temperature of the accumulator;
• computing a time average of square values of the measured charge-discharge current;
• and
• controlling the driving source and the motor to charge and discharge the accumulator in a range defined by the set effective input limit and the set effective output limit.