Driver assistance device, driver assistance system, and driver assistance method

A driver assistance system comprising:

• a first vehicle in which a surrounding monitoring sensor is installed;
• a second vehicle present around the first vehicle;
• a map generation unit which uses a coordinate position of the first vehicle and surrounding information representing a target present around the first vehicle, as detected by the surrounding monitoring sensor, to generate map information containing a coordinate position of a road;
• a localizer which works to determine a predicted travel position that is a coordinate position to which the first vehicle is expected to travel to;
• and
• a controller which uses generated map information that is the map information generated by the map generation unit to perform a driver assistance task for the first vehicle moving toward the predicted travel position, in response to the generated map information containing the predicted travel position being determined to be unusable, the controller uses external map information that is map information obtained from outside the first vehicle and contains the predicted travel position in performing the driver assistance task for the first vehicle.

A driver assistance method comprising:

• a map generation step of using a coordinate position of a first vehicle and surrounding information representing a target present around the first vehicle, as detected by a surrounding monitoring sensor installed in the first vehicle, to generate map information containing a coordinate position of a road;
• a position information obtaining step of obtaining a predicted travel position that is a coordinate position to which the first vehicle is expected to travel to;
• and
• a driver assistance control step of, when there is generated map information that is the map information which is generated in the map generation step and contains the predicted travel position, using the generated map information to perform a driver assistance task for the first vehicle moving toward the predicted travel position, in response to the generated map information containing the predicted travel position being determined to be unusable, the driver assistance control step using external map information that is map information obtained from outside the first vehicle and contains the predicted travel position in performing the driver assistance task for the first vehicle.