An autonomous mobile robot cleaner that can thoroughly clean an area of
high dust concentration. The robot cleaner includes a dust sensor to
detect collected dust and a dust concentration decision means to decide
degree of dust concentration in the area in which the main body of the
robot cleaner moves based on an output of the dust sensor. The robot
cleaner performs a basic cleaning operation while moving according to a
predetermined movement procedure. When it finds an area in which the
degree of dust concentration is above a given value using the dust
concentration decision means during the basic cleaning operation, it
additionally performs a local cleaning operation to move locally in such
area after its movement in accordance with the basic cleaning operation.
