VEHICLE POWER SUPPLY APPARATUS

A vehicle power supply apparatus includes a first power supply system, a second power supply system, a switch, a switch controller, and an assistance controller. The first power supply system includes a first electrical energy accumulator and an electric device coupled thereto. The second power supply system includes an electric motor coupled to an engine, and a second electrical energy accumulator able to be coupled to the electric motor. The switch controller controls the switch to an electrically conductive state on the condition that a motor assistance control is about to be executed. The assistance controller inhibits the motor assistance control on the condition that a charge state and a discharge state of the first electrical energy accumulator become ungraspable.