In-vehicle network system, electronic control unit, and gateway device

An in-vehicle network system which is mounted on a vehicle, comprising:

• an electronic control unit;
• a plurality of gateway devices;
• and
• a plurality of sensors that collect ambient information, which is information around the vehicle,
• wherein each of the sensors communicates with the electronic control unit via at least one of the plurality of gateway devices,
• the electronic control unit includes:
• a mode management unit that determines a first operation mode in a plurality of operation modes associated with a first sensor of the plurality of sensors to be operated, and
• a sleep instruction control unit that:
• specifies an operation mode of a first gateway device, which is directly connected to the first sensor, in which the first sensor does not operate, and in which the first gateway device does not need to relay information from the first sensor, based on the first operation mode, and
• transitions the first gateway device to a low power state in which a processing capacity is lowered, and wherein
• the first gateway device is directly connected to at least one additional sensor, and
• all sensors that are directly connected to the first gateway device do not operate in at least a same one operation mode as other sensors in the in-vehicle network system.