REGLER FÜR EINE FAHRZEUG-EIGENE BATTERIE

摘要

Charging and discharging of a battery are controlled while observing the state of the battery, thereby improving its efficiency and increasing battery service life. A program control circuit acquires the speed at which the vehicle is travelling, this being detected by a vehicle speed sensor, and the rotational speed of the internal combustion engine, this being detected by a rotation sensor. It controls an inverter which performs AC-to-DC or DC-to-AC conversion between a motor-generator coupled to the internal combustion engine and a battery mounted on the vehicle. At the same time, the program control circuit acquires the charging and discharging current (i) of the battery, this being detected by a current sensor, calculates the time integral I for this charging and discharging current (i), and controls the charging current to the battery during regenerative braking, and the discharge current when the vehicle is being driven, in accordance with a function of the time integral I. The overall life of the battery can be lengthened, as much as possible of the energy lost by the brakes can be regenerated, and even if there is variability in the characteristics of the unit cells, its increase can be held in check. In addition, battery costs can be reduced and maintenance simplified.