Patent ID: 9456725
Filing Date: 2016-10-04
CPC Classification: A47L,G05D

Claim Text:
1. A robot cleaner comprising: a main brush to brush a floor; a main brush motor to rotate the main brush; a Revolution Per Minute (RPM) detector to detect an RPM of the main brush motor; a control unit configured to determine whether the floor is a carpeted floor area or a hard floor area based on the detected respective RPM's of the main brush motor, when the robot cleaner is moving across the carpeted floor area or the hard floor area; an input unit on an exterior surface of the robot cleaner to allow a user of the robot cleaner to select between only one of a carpeted floor area cleaning mode or a hard floor area cleaning mode; an upward camera unit to capture an upward image perpendicular to a traveling direction of the robot cleaner; wherein the control unit produces a map using the upward image acquired by the upward camera unit and the detected respective RPM's such that the carpeted area, the hard floor area, a boundary between the carpeted floor area and the hard floor area and a stepped area are marked on the map; a storage for storing the map, wherein the control unit is further configured to clean either the carpeted floor area or the hard floor area based on the map, and wherein the control unit uses only the RPM of the main brush when determining the carpeted floor area or the hard floor area.