Battery charge/discharge control apparatus

A battery charge/discharge control apparatus for controlling charge/discharge of a battery in a vehicle comprising the battery serving as a motive power source for driving the vehicle, an inverter which performs conversion between a DC current and an AC current, a motor which transfers electric power to the battery through the inverter or from which electric power is transferred from the battery through the inverter, the battery charge/discharge control apparatus comprising:

• at least one central processing unit configured to operate as a battery control portion, a vehicle control portion, a failure determination portion and an inverter driving state detection portion;
• and
• wherein:
• the battery control portion controls charge/discharge of the battery;
• the vehicle control portion controls the inverter and controls the charge/discharge of the battery based on information from the battery control portion;
• the failure determination portion determines whether there is a failure in the battery control portion or not;
• and
• the inverter driving state detection portion detects a driving state of the inverter;
• wherein:
• the vehicle control portion controls the charge/discharge of the battery based on the driving state of the inverter detected by the inverter driving state detection portion when the failure determination portion determines that there is a failure in the battery control portion;
• the battery control portion outputs, to the vehicle control portion, a charge/discharge control amount for controlling the charge/discharge of the battery;
• the battery charge/discharge control apparatus further comprises a charge/discharge amount estimation portion which estimates a charge/discharge amount of the battery from driving state of the motor, an electromotive voltage calculation portion which calculates an electromotive voltage of the battery based on the charge/discharge amount of the battery estimated by the charge/discharge amount estimation portion and a voltage value of a current flowing in the inverter, which value is detected by the inverter driving state detection portion, and a failure-time discharge control amount calculation portion which calculates the charge/discharge control amount based on the electromotive voltage calculated by the electromotive voltage calculation portion;
• and
• the vehicle control portion controls the charge/discharge of the battery based on the charge/discharge control amount supplied from the battery control portion when the failure determination portion determines that there is no failure in the battery control portion, and controls the charge/discharge of the battery based on the charge/discharge control amount calculated by the failure-time discharge control amount calculation portion when the failure determination portion determines that there is a failure in the battery control portion.

A battery charge/discharge control apparatus for controlling charge/discharge of a battery in a vehicle comprising the battery serving as a motive power source for driving the vehicle, an inverter which performs conversion between a DC current and an AC current, a motor which transfers electric power to the battery through the inverter or from which electric power is transferred from the battery through the inverter, the battery charge/discharge control apparatus comprising:

• at least one central processing unit configured to operate as a battery control portion, a vehicle control portion, a failure determination portion and an inverter driving state detection portion;
• and
• wherein:
• the battery control portion controls charge/discharge of the battery;
• the vehicle control portion controls the inverter and controls the charge/discharge of the battery based on information from the battery control portion;
• the failure determination portion determines whether there is a failure in the battery control portion or not;
• and
• the inverter driving state detection portion detects a driving state of the inverter;
• wherein:
• the vehicle control portion controls the charge/discharge of the battery based on the driving state of the inverter detected by the inverter driving state detection portion when the failure determination portion determines that there is a failure in the battery control portion;
• the battery control portion outputs, to the vehicle control portion, a charge/discharge control amount for controlling the charge/discharge of the battery;
• the battery charge/discharge control apparatus further comprises a storage portion storing information in which a current value of a current supplied from the battery in order to drive a cooling fan of the battery has been associated with a temperature of the battery, and a failure-time discharge control amount calculation portion which refers to the information stored in the storage portion to acquire the current value corresponding to a temperature of the battery estimated when the cooling fan is driven in a predetermined driving state and which calculates the charge/discharge control amount based on the acquired current value;
• and
• the vehicle control portion controls the charge/discharge of the battery based on the charge/discharge control amount supplied from the battery control portion when the failure determination portion determines that there is no failure in the battery control portion, and controls the charge/discharge of the battery based on the charge/discharge control amount calculated by the failure-time discharge control amount calculation portion when the failure determination portion determines that there is a failure in the battery control portion.