Moving object, cleaning robot, floor condition determining device, method of controlling the moving object, and method of controlling the cleaning robot
First Claim
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1. A cleaning robot comprising:
- a light source configured to irradiate a first light to a floor surface;
a first sensor configured to sense a light specularly reflected from the floor surface;
a second sensor configured to sense a light diffusely reflected from the floor surface, at a position different from a position of the first sensor, wherein the first sensor and the second sensor are respectively configured to output a first electrical signal and a second electrical signal; and
a controller configured to;
calculate a ratio between a voltage of the first electrical signal and a voltage of the second electrical signal,compare a result of calculating the ratio between the voltage of the first electrical signal and the voltage of the second electrical signal with a reference value,increase a count variable according to a result of comparison,determine a condition of the floor surface based on a result sensed by the first sensor and the second sensor and whether the count variable is equal to a present count reference value, anddetermine whether a recessed region is present on the floor surface by comparing at least one of the voltage of the first electrical signal or the voltage of the second electrical signal with a corresponding reference voltage.
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Abstract
Provided are a moving object, a cleaning robot, a floor condition determining device, a method of controlling the moving object, and a method of controlling the cleaning robot. The moving object includes a light source configured to irradiate a first light to a floor surface, a plurality of sensors for receiving light reflected from the floor surface at different positions from each other, and a controller configured to determine a condition of the floor surface on the basis of a result sensed by the plurality of sensors.
18 Citations
13 Claims
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1. A cleaning robot comprising:
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a light source configured to irradiate a first light to a floor surface; a first sensor configured to sense a light specularly reflected from the floor surface; a second sensor configured to sense a light diffusely reflected from the floor surface, at a position different from a position of the first sensor, wherein the first sensor and the second sensor are respectively configured to output a first electrical signal and a second electrical signal; and a controller configured to; calculate a ratio between a voltage of the first electrical signal and a voltage of the second electrical signal, compare a result of calculating the ratio between the voltage of the first electrical signal and the voltage of the second electrical signal with a reference value, increase a count variable according to a result of comparison, determine a condition of the floor surface based on a result sensed by the first sensor and the second sensor and whether the count variable is equal to a present count reference value, and determine whether a recessed region is present on the floor surface by comparing at least one of the voltage of the first electrical signal or the voltage of the second electrical signal with a corresponding reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling a cleaning robot, the method comprising:
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irradiating a first light toward a floor surface; sensing a light reflected from the floor surface by each of a first sensor and a second sensor disposed at different positions, wherein the first sensor receives a light specularly reflected from the floor surface, and the second sensor receives a light diffusely reflected from the floor surface; outputting, respectively using the first sensor and the second sensor, a first electrical signal and a second electrical signal; comparing a result of calculating a ratio between a voltage of the first electrical signal and a voltage of the second electrical signal with a reference value; increasing a count variable according to a result of comparison; determining a condition of the floor surface based on results of sensing by the first sensor and the second sensor and whether the count variable is equal to a preset count reference value; and determining whether a recessed region is present on the floor surface by comparing at least one of the voltage of the first electrical signal or the voltage of the second electrical signal with a corresponding reference voltage. - View Dependent Claims (11, 12, 13)
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Specification