ON-VEHICLE BATTERY CONTROLLER AND METHOD FOR CONTROLLING ON-VEHICLE BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a battery controller 1 capable of preheating an on-vehicle battery 2 without marring the startability of an engine 6 under a low-temperature environment.SOLUTION: A battery controller 1 controls the discharge of an on-vehicle battery 2 for preheating. The battery controller comprises a control unit 5 having: first calculation means for calculating, on the basis of a lower limit value of a charging rate, a minimum current value Iand a maximum discharge time ΔTwhich satisfy a relational expression when a maximum output Pof the on-vehicle battery 2 after discharge is equal to a request output Prequired for starting an engine 6; second calculation means for calculating a maximum current value Iand a minimum discharge time ΔT, which satisfy the relational expression on the basis of a lower limit voltage V; discharge condition-deciding means for deciding a discharge condition on the basis of the minimum current value I, the maximum current value I, the minimum discharge time ΔTand the maximum discharge time ΔT; and discharge means for discharging the on-vehicle battery 2.SELECTED DRAWING: Figure 4