Abstract: An electric power source system for a vehicle includes: a high-voltage battery; a first electric power source arrangement; a second electric power source arrangement; and a third electric power source arrangement, wherein the first electric power source arrangement includes a first DCDC converter and a first battery and is configured to supply the electric power to a first load including at least an automatic driving system, the second electric power source arrangement includes a second DCDC converter and a second battery and is configured to supply the electric power to a second load including at least a steering ECU, a brake ECU, and an information communication unit, and the third electric power source arrangement includes a connection controller and a third battery and is configured to supply the electric power to a third load including at least the steering ECU, the brake ECU, and the information communication unit.

Abstract: A power supply system for a vehicle includes: a high-voltage battery; a first power supply arrangement; a second power supply arrangement; and a third power supply arrangement, wherein the first power supply arrangement is connected to a first load including at least an autonomous driving system and includes a first DC-DC converter, a first battery, and a connection control unit, the connection control unit being configured to control a connection state between the first DC-DC converter and the autonomous driving system and a connection state between the first battery and the autonomous driving system.

Abstract: A power supply system for a vehicle includes: a high-voltage battery; a first power supply arrangement; a second power supply arrangement; and a third power supply arrangement, wherein the first power supply arrangement is connected to a first load including at least an autonomous driving system and includes a first DC-DC converter, a first battery, and a connection control unit, the connection control unit being configured to control a connection state between the first DC-DC convener and the autonomous driving system and a connection state between the first battery and the autonomous driving system.

Abstract: An electric power source system for a vehicle includes: a high-voltage battery; a first electric power source arrangement; a second electric power source arrangement; and a third electric power source arrangement, wherein the first electric power source arrangement includes a first DCDC converter and a first battery and is configured to supply the electric power to a first load including at least an automatic driving system, the second electric power source arrangement includes a second DCDC converter and a second battery and is configured to supply the electric power to a second load including at least a steering ECU, a brake ECU, and an information communication unit, and the third electric power source arrangement includes a connection controller and a third battery and is configured to supply the electric power to a third load including at least the steering ECU, the brake ECU, and the information communication unit.

Abstract: A first electric power generation device configured to produce an accessory voltage according to a first instruction voltage. A second electric power generation device configured to produce the accessory voltage according to a second instruction. An electric control unit is configured to execute crank position stop control for stopping a crank of the engine at a target position when the engine is stopped by controlling the first electric power generation device such that a current is circulated in the first electric power generation device and the rotating electric machine generates braking torque. The electric control unit is configured to execute the crank position stop control in a state in which the second instruction voltage is equal to or higher than the first instruction voltage.

Abstract: A first electric power generation device configured to produce an accessory voltage according to a first instruction voltage. A second electric power generation device configured to produce the accessory voltage according to a second instruction. An electric control unit is configured to execute crank position stop control for stopping a crank of the engine at a target position when the engine is stopped by controlling the first electric power generation device such that a current is circulated in the first electric power generation device and the rotating electric machine generates braking torque. The electric control unit is configured to execute the crank position stop control in a state in which the second instruction voltage is equal to or higher than the first instruction voltage.