JP4268911B2 - Self-propelled vacuum cleaner - Google Patents

Description

  The present invention relates to a self-propelled cleaner that performs self-propelled cleaning using power such as an electric motor.

  An example of a conventional self-propelled cleaner is described in Patent Document 1. In the vacuum cleaner described in this publication, a cleaning brush and a squeegee are used as cleaning means, and a wheel, a motor that drives the wheel, and a sensor that detects an obstacle are used as moving means. And it cleans while running autonomously. In this self-propelled cleaner, obstacles such as walls that obstruct travel are detected by a non-contact sensor, and the obstacles are efficiently avoided to improve the cleaning efficiency.

JP-A-9-206258

  In the self-propelled cleaner described in Patent Document 1, in order to avoid contact with an obstacle such as a wall, a considerable distance is provided between the obstacle such as a wall and the path of the self-propelled cleaner. There was a large uncleaned area left on the wall.

  This invention is made | formed in view of the malfunction of the said prior art, The objective is to reduce an uncleaned area | region in a self-propelled cleaner.

  A feature of the present invention that achieves the above object is a self-propelled cleaner that has a power source inside and is covered with a substantially cylindrical cover, and is capable of self-propelled, and a mouthpiece that sucks dust from the floor, and self-propelled A moving means for self-propelling the vacuum cleaner, a sensing means for detecting an object disposed on the outer periphery of the cover, and a movement control means for controlling the moving means based on information on the object detected by the sensing means, The sensing means has a plurality of optical sensors having different detection heights.

  In this feature, the suction body can project in a direction substantially perpendicular to the traveling direction, and at least two of the optical sensors are side sensors that sense an object in a direction substantially perpendicular to the traveling direction, and move The control means controls the moving means so that the smallest distance among the distances detected by the plurality of side sensors is made constant, and the suction mouth is set according to the distance detected by the side sensor having the lowest detection height. It is desirable to control the amount of protrusion of the body.

  Furthermore, the sensing means has an oblique front sensor that senses an object obliquely forward with respect to the traveling direction of the self-propelled cleaner, and the movement control means is configured to detect the oblique forward sensor during traveling using the side sensor. The self-propelled cleaner is preferably turned when an object is detected within a predetermined distance.

  Further, a transmitting means for transmitting the ultrasonic wave and a receiving means for receiving the reflected wave of the ultrasonic wave transmitted from the transmitting means are arranged on the front side in the traveling direction of the self-propelled cleaner at the periphery of the cover. The movement control means drives the drive means based on the signals of the transmission means and the reception means if the output of the side sensor falls below a predetermined threshold during traveling using the side sensor. preferable.

  The transmission means and the transmission means can detect an object positioned obliquely forward with respect to the traveling direction of the self-propelled cleaner, and the movement control means can detect the self-propelled cleaner and the object from signals of the transmission means and the reception means. And the driving means may be controlled so that the distance becomes a predetermined value.

  A plurality of transmission means and a plurality of transmission means may be provided, and the transmission means and the transmission means may be alternately arranged on the side surface of the case in the circumferential direction. The power source is preferably a rechargeable storage battery, and a contact sensor for detecting that the self-propelled cleaner is in contact with an object is preferably disposed inside the cover.

  According to the present invention, since the infrared distance sensors are provided at a plurality of positions in the height direction and the plurality of ultrasonic sensors are provided on the front side in the traveling direction, the wall portion is formed with a step in the height direction or protrudes in the traveling direction. Even if the wall is a glass surface, the self-propelled cleaner can surely run near the wall, and the uncleaned area can be reduced.

  Hereinafter, some examples of the self-propelled cleaner according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a self-propelled cleaner 1. FIG. 2 shows a cross-sectional view of FIG. The self-propelled cleaner 1 has a columnar shape with a low height, and its side surface is covered with a cover 2 having a substantially cylindrical shape with a diameter of about 25 cm. The upper surface of the self-propelled cleaner 1 is covered with a top plate 4 to which an operation switch 3 for operating the self-propelled cleaner 1 is attached. In the center of the top plate 4, a handle 5 formed in a recessed shape is provided so that the user can carry the self-propelled cleaner 1. An exhaust port 16 is formed in the handle 5 part.

  The cover 2 is supported by four piano wires 44a to 44d erected substantially vertically from the base of the self-propelled cleaner 1, and the cover 2 is displaced when receiving a horizontal force. When the cover 2 is displaced in the horizontal direction and contacts any one of the six contact sensors 42a to 42f arranged in the circumferential direction inside the cover 2, the displacement direction of the cover 2 is detected. With this structure, when the cover 2 comes into contact with an obstacle or the like, the fact that the cover 2 comes into contact with the obstacle and the direction of contact can be detected.

  Infrared distance sensors 6a to 6c are attached to the side portions of the self-propelled cleaner 1, on the front side in the traveling direction, on the front right side, and on the right side, respectively. The infrared distance sensors 6 a to 6 c are attached at positions recessed from the cover 2. Each of the infrared distance sensors 6a to 6c is provided with two light receivers on the upper and lower sides, as will be described in detail later. The receivers 7a and 7b and the transmitters 8a and 8b of the ultrasonic sensors are located at the same height as the light receivers of the upper infrared distance sensors 6a to 6c on the side surface of the self-propelled cleaner 1. It is attached. The ultrasonic sensor receivers 7 a and 7 b and the transmitters 8 a and 8 b are alternately arranged in the circumferential direction, and are attached at positions recessed from the cover 2.

  Drive wheels 9a and 9b are attached to the lower part of the self-propelled cleaner 1 and at the center in the front-rear direction. Most of the drive wheels 9a, 9b are covered with the cover 2, and only the portion close to the floor surface is exposed. The drive wheels 9a and 9b are independently driven by travel motors 11a and 11b, respectively. Rotary encoders 12a and 12b are attached to the shaft ends of the traveling motors 11a and 11b. The rotation axes of the left and right drive wheels 9a, 9b are substantially on the same straight line and are substantially orthogonal to the cylindrical central axis of the cover 2. The rotary encoders 12a and 12b detect the rotation amounts of the traveling motors 11a and 11b. The traveling motors 11a and 11b are driven by a storage battery (not shown), and a charging circuit is used when charging the storage battery.

  In FIG. 1, a suction port on the right side of the rear portion of the self-propelled cleaner 1, which can be stored in the self-propelled cleaner 1 when not cleaned, and can protrude outward from the self-propelled cleaner 1 during cleaning. A body 10 is provided. The mouthpiece 10 is disposed at the lower part of the self-propelled cleaner 1. The mouthpiece 10 has an opening toward the floor and sucks dust from the floor.

  The self-propelled cleaner 1 includes a fan 13, a fan motor 14 that drives the fan, and a dust case 15 that accommodates the dust sucked by the fan 13 so as to suck dust and the like from the floor. When the fan motor 14 rotationally drives the fan 13, air is sucked from the opening of the suction body 10. The sucked air is exhausted from the dust case 15 through the fan 13 to the outside of the self-propelled cleaner 1 through a slit-like exhaust port 16 formed in the handle 5 at the top of the self-propelled cleaner 1. The dust contained in the sucked air is collected in the dust case 15 by a filter 17 (not shown) attached to the dust case 15.

  A suction body moving motor 18, a ball screw 19, and a belt 22 are provided to project the suction body 10 located inside the cover 2 to the outside of the self-propelled cleaner 1 during cleaning. A rotary encoder 20 is attached to the shaft end of the suction body moving motor 18. When the suction body moving motor 18 rotates, the belt 22 mounted on the pulley attached to the shaft end of the suction body moving motor 18 moves, and the ball screw 22 mounted with this belt rotates to rotate the suction body 10. Is sent to the right and displaced to the right in the direction of travel. Thereby, the right front-end | tip part of the mouthpiece 10 protrudes outside a main body.

  The displacement amount (protrusion amount) of the mouthpiece 10 is measured by the rotary encoder 20. In order to determine a reference for the displacement of the mouthpiece 10, the mouthpiece origin detection sensor 21 is attached in the vicinity of the movement path of the mouthpiece 10. The mouthpiece origin detection sensor 21 switches between opening and closing when the mouthpiece 10 passes the origin position. The mouthpiece origin detection sensor 21 is also used to detect on which side of the mouthpiece 10 the origin is located. When the self-propelled cleaner 1 is powered on, the mouthpiece 10 is moved in the direction of the origin detected by the mouthpiece origin switch 21. Pass the origin once and correct the origin. Based on the origin position of the suction body 10 thus obtained and the rotation amount of the suction body moving motor 18 output from the rotary encoder 20, the amount of protrusion of the suction body 10 is calculated by a calculation means (not shown).

  As described above, the front side of the self-propelled cleaner 1, the diagonally forward right side displaced by about 45 degrees to the right with respect to the traveling direction of the self-propelled cleaner 1, and the right side are positioned in front of the detection surface. Infrared distance sensors 6a, 6b and 6c for measuring the distance to the object to be attached are attached. The infrared distance sensor 6c on the right side is attached with an offset of about 4 cm forward from the rotation shafts of the drive wheels 9a and 9b. This infrared distance sensor 6a (6b, 6c) is shown in a side view in FIG.

  The infrared distance sensor 6a is a set of four light emitting diodes (LEDs) 23 and two light receivers 24a and 24b. The light receivers 24a and 24b are used to measure the incident angle of infrared rays. For the light receivers 24a and 24b, two position detection elements (PSDs) and two photodiodes with different directions are used in combination.

When one of the LEDs 23, for example, the uppermost LED 23a is turned on, the infrared light emitted from the LED 23a is reflected at a point A on the detection target 25 located in front of the LED 23a. And it injects with the incident angle (phi) in the light receiver 24a adjacent to LED23a which light-emitted. When the light receiver 24a detects the incident angle φ, the distance dh from the infrared distance sensor 6 to the detection target 25 is obtained by the following equation using the distance dv between the LED 23a and the light receiver 24a.
dh = dv · tan (90 ° −φ)
Using the LEDs 23b to 23d, the distance to the detection target 25 located in front can be obtained in the same manner.

  If the directivity of the infrared rays emitted from the LEDs 23a to 23d is narrowed down by providing a lens or a hood, the infrared spot projected on the detection target 25 becomes a small diameter, and the influence of the reflectance of the surface of the detection target 25 is affected. And the angle of incidence φ can be measured accurately. As a result, the measurement accuracy of the distance dv is improved.

  By the way, if the obstacle located in the advancing direction of the self-propelled cleaner 1 is a surface that easily reflects infrared rays, such as an indoor boarding surface or a concrete surface, the infrared distance sensor functions effectively. However, when the obstacle is a mirror surface or a glass surface that easily transmits infrared rays, it is difficult to recognize the obstacle only with the infrared distance sensor. Therefore, the self-propelled cleaner 1 shown in the present embodiment also includes an ultrasonic sensor 26. A method for detecting an obstacle using the ultrasonic sensor 26 will be described with reference to FIG.

  The ultrasonic sensor 26 is a side part of the self-propelled cleaner 1 and two ultrasonic receivers 7a and 7b attached to the front side. It has two ultrasonic transmitters 8a and 8b arranged alternately with the receivers 7a and 7b, and an ultrasonic sensor controller 27 (not shown) housed inside the cover 2. The ultrasonic receivers 7 a and 7 b and the ultrasonic transmitters 8 a and 8 b are each connected to the ultrasonic sensor controller 27.

  The ultrasonic sensor controller 27 (1) sends a transmission signal to the transmitters 8a and 8b and causes the transmitters 8a and 8b to generate ultrasonic waves. (2) detects that the receivers 7a and 7b have received the ultrasonic waves. (3) The time from when the transmitters 8a and 8b transmit ultrasonic waves to when the receivers 7a and 7b receive ultrasonic waves is measured. The ultrasonic sensor 26 determines the distance from the transmitters 8a and 8b to the detection target and the detection target based on the measured time from transmission to reception of the ultrasonic wave and the speed of sound stored in the ultrasonic sensor controller 27 in advance. The sum with the distance to the receiver 7 is obtained.

  When the receivers 7a and 7b and the transmitters 8a and 8b are arranged as shown in FIG. 4, the left receiver 7a receives the reflected wave of the ultrasonic wave transmitted from the left transmitter 8a, so that the region 28a is within the area 28a. An obstacle can be detected. The reflected ultrasonic wave transmitted from the right transmitter 8b can be received by either the left receiver 7a or the right receiver 7b. If the left receiver 7a receives the obstacle, the obstacle in the area 28b can be detected. If the right receiver 7b receives the obstacle, the obstacle in the area 28c can be detected.

  Since the receivers 7a and 7b and the transmitters 8a and 8b of the ultrasonic sensor 26 are alternately arranged on the outer peripheral portion of the self-propelled cleaner 1, two reflected waves of ultrasonic waves transmitted from one transmitter are provided. Receiver can receive. Thereby, an object can be detected over a wide range with a smaller number of transmitters / receivers than when a transmitter and a receiver are combined one-on-one.

  If a plurality of ultrasonic sensors are used, the sensors may interfere with each other. Therefore, ultrasonic waves are transmitted sequentially from each transmitter at intervals of several milliseconds to several tens of milliseconds. As the number of ultrasonic sensors increases, the detection interval for each sensor becomes longer. In the present embodiment, for example, the receivers 7a and 7b are arranged on both sides of the transmitter 8b, and the receivers 7a and 7b in which the reflected waves are arranged on both sides of the transmitter 8b are simply transmitted from the transmitter 8b once. Since it detects, 2 area | regions can be detected by one transmission and a detection interval can be shortened.

  Inside the self-propelled cleaner 1, a gyro sensor 29 (see FIG. 5) and contact sensors 42a to 42f for detecting that the cover 2 is in contact with an object such as a human are provided. The gyro sensor 29 is used to obtain the angle at which the self-propelled cleaner 1 rotates around the vertical axis, and outputs a voltage corresponding to the angular velocity around the vertical axis. As shown in FIG. 5, the output voltage is input to the analog-digital converter 30 (A / D converter) and digitized.

  In FIG. 5, the control block diagram of the self-propelled cleaner 1 is shown. Information is input into the self-propelled cleaner 1 from the gyro sensor 29, the optical distance sensors 6a to 6c, the rotary encoders 12a and 12b, the 20 ultrasonic sensors 7a and 7b, etc., and the self-propelled cleaner 1 is controlled. A main controller 31 is arranged. The main controller 31 has a memory 32 and stores information such as the route traveled.

  Information on the amount of rotation of the traveling motors 11a and 11b is input to the main controller 31 from the rotary encoders 12a and 12b of the left and right traveling motors 11a and 11b. Information on the amount of displacement of the suction body 10 is input from the detection switch 21 and the rotary encoder 20 that detect the origin of the suction body. From the three infrared distance sensors 6a, 6b, and 6c, information on distances to objects located around the sensors 6a, 6b, and 6c is input.

  Further, the ultrasonic sensor controller 27, the operation switch 3, and the A / D converter 30 are connected to the main controller 31. The ultrasonic sensor controller 27 outputs information on the distance to an object located around the self-propelled cleaner 1 detected by the ultrasonic sensor 26. The operation switch 3 outputs user operation information. The A / D converter 30 digitally converts the output from the gyro sensor 29 to calculate and output the angular velocity of the self-propelled cleaner 1.

  From the main controller 31, motors 11a, 11b, 14, to which the drivers 33a, 33b, 34, 35 are connected are connected to the left and right traveling wheel motor drivers 33a, 33b, the fan motor driver 34, and the suction moving motor driver 35. The drive voltage applied to 18 is commanded.

  Operation | movement of the self-propelled cleaner 1 comprised in this way is demonstrated below. When the self-propelled cleaner 1 travels along a wall or the like while cleaning, the traveling direction and the protruding amount of the mouthpiece 10 are changed in accordance with the wall shape. That is, when cleaning the side of the wall, if the cover 2 or the suction body 10 of the self-propelled cleaner 1 gets too close to the wall and comes into contact with the wall, it is necessary to reverse the direction once in order to continue cleaning. As a result, the time required for cleaning becomes longer.

  In order to avoid this problem, if the traveling path of the self-propelled cleaner 1 is greatly separated from the wall to prevent the cover 2 and the suction body 10 from coming into contact with the wall, a wide uncleaned area is generated. Therefore, in this embodiment, the self-propelled cleaner 1 is not brought into contact with the wall surface, and the occurrence of an uncleaned area near the wall is reduced. The specific method is shown below.

  In FIG. 6, a mode that the self-propelled cleaner 1 cleans the wall 38 side is shown. The traveling direction of the self-propelled cleaner 1 is the front side of the page. The self-propelled cleaner 1 protrudes the mouthpiece 10 from the maximum diameter portion of the cover 2 of the self-propelled cleaner 1 by a distance d5. Here, the wall 38 has a shape with a step in the height direction. This simulates the shape of a storage shelf in a kitchen, for example.

  In the mouthpiece 10 located on the floor surface 42, the distance from the maximum diameter portion of the cover 2 of the self-propelled cleaner 1 to the wall 38 is d4 (> d5), whereas above the mouthpiece 10, The distance is d3 (<d4). Further upward, the distance between the maximum diameter portion of the cover 2 and the wall 38 is reduced to d2 (<d3), and above that, the distance increases again to d1 (> d2). The distances d1 to d4 are distances to the wall 38 detected by the right infrared distance sensor 6c.

  In wall cleaning or the like in which the self-propelled cleaner 1 makes a round along the outer periphery of the room, the self-propelled cleaner 1 moves forward while looking at the wall 38 on the right side in the traveling direction. At that time, the tip of the mouthpiece 10 is protruded from the cover 2 to the right with respect to the traveling direction, and even if the entrance is blocked by the cover 2 of the self-propelled cleaner 1, the mouthpiece 10 is extended. Reduces the area left uncleaned near the walls and furniture.

  In this way, the suction body 10 is extended to reduce the uncleaned area. However, when the wall 38 changes in the vertical direction (height direction) as shown in FIG. 6, the height of the sensor that recognizes the wall 38 is increased. There is a risk of misidentifying the distance to the wall 38 depending on the vertical position. As a result, the cover 2 comes into contact with or collides with the wall 38, or the uncleaned area is increased by controlling the suction body 10 so as not to approach the wall 38.

  Therefore, in this embodiment, infrared distance sensors 6a to 6c for sensing different positions in the height direction as shown in FIG. In FIG. 6, the self-propelled cleaner 1 moves straight forward in the drawing, and the wall 38 is on the right side of the self-propelled cleaner 1. It recognizes with the infrared distance sensor 6c arrange | positioned on the right side of 1 cover 2 outer peripheral part. That is, among the distances d1 to d4 detected by the four LEDs 23a to 23d of the infrared distance sensor 6c, the shortest distance is the distance to the wall 38 of the self-propelled cleaner 1. And the advancing direction of self-propelled cleaner 1 is controlled so that this distance may approach predetermined threshold value dw.

  In FIG. 6, since the detection distance d2 detected by the second LED 23b from the top is the shortest, the traveling direction of the self-propelled cleaner 1 is controlled based on the distance d2. If the detection distance d2 is larger than the predetermined distance dw, the rotational speed of the left traveling motor 11a is made larger than the rotational speed of the right traveling motor 11b so that the self-propelled cleaner 1 approaches the wall 38. Conversely, if the detection distance d2 is smaller than the predetermined distance dw, the rotational speed of the right traveling motor 11b is made larger than the rotational speed of the left traveling motor 11a in order to keep the self-propelled cleaner 1 away from the wall 38. If the detected values of the other LEDs 23a to 23d become the shortest while the self-propelled cleaner 1 continues to travel, the traveling direction of the self-propelled cleaner 1 is controlled based on the detected values of the shortest LEDs.

  The protrusion amount d5 of the mouthpiece 10 is determined based on the distance d4 detected by the lowermost LED. Here, since the infrared distance sensor 6c on the right side is ahead of the mouthpiece 10 in the traveling direction, the distance to the wall 38 is detected ahead of the mouthpiece 10. The main controller 31 determines the protrusion amount of the mouthpiece 10 based on the distance detected by the right infrared distance sensor 6c and the history of the travel route of the self-propelled cleaner 1 stored in the storage means. Thereby, the mouthpiece 10 can be prevented from coming into contact with the wall 38, and the tip of the mouthpiece 10 in the projecting direction can be projected to the vicinity of the wall 38.

  When the traveling direction of the self-propelled cleaner 1 and the amount of protrusion of the suction body 10 are controlled in this way, even the wall 38 whose shape changes in the height direction can be moved to the immediate vicinity of the wall with the self-propelled cleaner 1. I can clean it. Then, the cover 2 and the suction body 10 do not come into contact with the wall 38, and the tip of the suction body 10 in the protruding direction passes through the wall 38, and the uncleaned area is reduced.

  When two or more LEDs of the right-side infrared distance sensor 6c are provided in the height to the upper surface of the mouthpiece 10, the shortest value among the distances detected by these LEDs is used. Determine the amount of protrusion. In the present embodiment, the distance between the wall 38 and the self-propelled cleaner 1 is measured using an infrared distance sensor. However, visible light, laser, or ultrasonic waves may be used as the distance sensor.

  Next, a method for bypassing the portion where the wall 39 protrudes in the traveling direction when the self-propelled cleaner 1 is cleaned along the wall will be described below. 7A to 7F are top views showing the movement of the self-propelled cleaner 1. In the traveling direction of the self-propelled cleaner 1, a protrusion 40 protruding from the wall 39 is formed on the wall 39. Until the vicinity of the convex portion 40 is reached, the self-propelled cleaner 1 uses the right-side infrared distance sensor 6c to control the amount of protrusion of the mouthpiece 10 and continues cleaning according to the above-described cleaning algorithm along the wall (FIG. 7 (a )reference).

  When the self-propelled cleaner 1 continues to move forward and approaches the convex portion forward in the traveling direction, the convex portion 40 enters the detection range 43 of the infrared distance sensor 6b facing diagonally right front, and the infrared distance sensor 6b is the convex portion 40. The convex part 40 is detected by the reflected light from. Thereby, the main controller 31 recognizes that it is approaching the convex part 40 (refer FIG.7 (b)). When the vehicle continues to move forward, the detection distance of the infrared distance sensor 6b becomes shorter, and when the detection distance reaches a predetermined threshold value Da, the traveling of the self-propelled cleaner 1 is temporarily stopped (see FIG. 7C). .

  In order to bypass the convex part 40, the self-propelled cleaner 1 is turned around the central axis of the self-propelled cleaner 1 at the temporary stop position. At this time, the right driving wheel 9b is rotated forward and the left driving wheel 9a is rotated reversely at the same rotational speed as the right driving wheel 9b. The self-propelled cleaner 1 turns counterclockwise on the spot (see FIG. 7D). In order to prevent the mouthpiece 10 from colliding with the wall 39 and the convex portion 40 with the turning, the protruding amount of the mouthpiece 10 is changed. The main controller 31 controls the amount of protrusion of the mouthpiece 10 so that the tip of the mouthpiece 10 passes immediately next to the wall surface 39. At that time, the amount of protrusion of the mouthpiece 10 is controlled using the distance history detected by the right-side infrared distance sensor 6c.

  When the detection distance of the infrared distance sensor 6c on the right side starts from decreasing to increasing (see FIG. 7E), the left turn of the self-propelled cleaner 1 is stopped. And it returns to the state of the normal wall side running (refer to Drawing 7 (f)). The self-propelled cleaner 1 turns to the right along the convex portion 40 of the wall 39 and travels around without touching the convex portion 40.

In the series of avoidance operations described above, the distance threshold Da detected by the right oblique front infrared distance sensor 6b is such that the front end of the cover 2 is slightly in front of the extended surface of the front surface of the convex portion 40, and the convex portion 40 is. It is set to start the operation to bypass. In the present embodiment, since the infrared distance sensor 6b forms an angle of 45 degrees with respect to the traveling direction, the detection distance threshold Da is expressed by the following equation, where the radius of the cover 2 is Rb.
Da = Rb / sin45 ° -Rb + Dt
Here, Dt is set to about 1 to 1.5 times the threshold value dw used in the above-mentioned wall cleaning.

  By the way, when the inner peripheral portion of the room is covered with a transparent object such as glass, even if infrared rays are emitted, most of the light becomes transmitted light and almost no reflected infrared light is generated. Further, unlike reflected light generated on an opaque wall such as made of wood or concrete, a slight amount of reflected infrared light is mostly regular reflected light and has little irregular reflection. As a result, even if infrared rays are emitted from the infrared distance sensor 6 to a transparent object such as glass, the object may not be detected.

  Therefore, in the present embodiment, the self-propelled cleaner 1 is provided with an ultrasonic sensor capable of sensing even the glass window 41. FIG. 8 is a top view showing a state of sensing at the glass window 41 portion. This is a case where the self-propelled cleaner 1 runs along the wall in the order of the transparent glass window 41 from the plate wall. When the plate wall 38 is switched to the transparent glass window 41, the received signal level of the infrared distance sensor 6c is lowered. Therefore, the glass window 41 is sensed by combining the right ultrasonic receiver 7b and the right ultrasonic transmitter 8b.

  The ultrasonic wave transmitted from the ultrasonic transmitter 8b is reflected by the glass window 41, and a part thereof is received by the receiver 7b. Thus, even if the infrared distance sensor 6c cannot detect the glass window 41, the ultrasonic transceivers 7b and 8a can detect the glass window 41. Therefore, until the infrared distance sensor 6c can sense again, the wall (window) 41 Output of the ultrasonic transceivers 7b and 8a is used for sensing the distance up to.

  As for the distance obtained as a result of sensing using the ultrasonic receiver 7b and the transmitter 8b, the ultrasonic wave emitted from the transmitter 8b is reflected by the glass window 41 positioned obliquely forward of the self-propelled cleaner 1, and received. This is the path length that has reached the machine 7b. That is, the sum of the distance ds1 from the transmitter 8b to the glass window 41 and the distance ds2 from the glass window 41 to the receiver 7b, (ds1 + ds2). A threshold da of a sum of distances (ds1 + ds2) corresponding to the threshold of the distance Da between the wall 38 and the self-propelled cleaner 1 when the right-side infrared receiver 6c is used is obtained in advance. Then, the main controller 31 controls the self-propelled cleaner 1 so that the sum of the distances detected by the infrared transceivers 8b and 7b becomes the threshold value da. Thereby, even if it is a place where traveling control is impossible with the infrared distance sensor 6c, the cleaning by the wall can be surely continued, and as a result, the cleaning efficiency is improved.

According to the above embodiment, even if there is a wall or an obstacle whose shape changes in the height direction in the traveling direction of the self-propelled cleaner, it collides with the wall by using a plurality of sensors provided in the height direction. The self-propelled cleaner can be run without being approached. Further, the mouthpiece can be brought close to a distance from the wall as much as when traveling on a normal flat wall surface. Furthermore, even if the wall has a convex part that protrudes forward in the direction of travel when traveling along the wall, distance sensors are provided at multiple locations on the outer periphery of the self-propelled cleaner, so the side of the wall is bypassed by the convex part. Can be cleaned. Even if the wall is a transparent object such as glass, the edge of the wall can be cleaned without contacting the wall using an ultrasonic sensor. In the present invention, by simply providing a plurality of ultrasonic sensors, a plurality of infrared sensors, and a contact sensor on the cover, it is possible to cope with irregularities and obstacles on the wall surface, and the number of parts is reduced, and the self-propelled cleaner becomes compact.

The perspective view of one Example of the self-propelled cleaner concerning the present invention. The plane sectional view of the self-propelled cleaner shown in FIG. The side view of the infrared distance sensor used for the self-propelled cleaner shown in FIG. The figure explaining operation | movement of an ultrasonic sensor. The control block diagram of the self-propelled cleaner shown in FIG. The figure explaining operation | movement of the self-propelled cleaner shown in FIG. The figure explaining operation | movement of the self-propelled cleaner shown in FIG. The figure explaining operation | movement of the self-propelled cleaner shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Self-propelled cleaner, 2 ... Cover, 3 ... Operation switch, 4 ... Top plate, 5 ... Handle, 6a-6c ... Infrared distance sensor, 7a, 7b ... Ultrasonic receiver, 8a, 8b ... Ultrasonic transmission Machine, 9a, 9b ... driving wheel, 10 ... suction port, 11a, 11b travel motor, 12a, 12b ... rotary encoder, 13 ... fan, 14 ... fan motor, 15 ... dust case, 16 ... exhaust port, 17 ... filter , 18 ... Mouthpiece moving motor, 19 ... Ball screw, 20 ... Rotary encoder, 21 ... Mouthpiece origin detection sensor, 22 ... Belt, 23a-23d ... LED, 24a, 24b ... Light receiver, 25 ... Detection object, 28a- 28c: Detectable range of ultrasonic sensor, 29 ... Gyro sensor, 30 ... A / D converter, 31 ... Main controller, 32 ... Memory, 33a, 33b ... Motor driver , 34... Fan motor driver, 35. Mouth moving motor driver, 38, 39... Wall, 40. Convex portion, 41. Glass window (wall), 42 a to 42 f, contact sensor, 43. 44d ... Piano wire.

Claims (7)

In a self-propelled vacuum cleaner that has a power source inside and is self-propelled covered with a substantially cylindrical cover,
A mouthpiece for sucking dust from the floor, a moving means for self-propelling the self-propelled cleaner, a sensing means for detecting an object disposed on the outer periphery of the cover, and information on the object detected by the sensing means A movement control means for controlling the movement means based on
Said sensing means possess a plurality of different optical sensors of sensor height,
The mouthpiece can project in a direction substantially perpendicular to the traveling direction;
At least two of the optical sensors are side sensors that sense an object substantially perpendicular to the direction of travel,
The movement control means controls the movement means so that a minimum distance among the distances detected by the plurality of side sensors is made constant, and the distance detected by the side sensor having the lowest detection height. A self-propelled cleaner characterized by controlling the protruding amount of the mouthpiece in response . The sensing means includes an oblique front sensor that senses an object obliquely forward with respect to the traveling direction of the self-propelled cleaner, and the movement control means is configured to detect the oblique forward sensor during traveling using the side sensor. The self-propelled cleaner according to claim 1, wherein the self-propelled cleaner is turned when an object is detected within a predetermined distance. A transmitting means for transmitting ultrasonic waves and a receiving means for receiving reflection of ultrasonic waves transmitted from the transmitting means are provided on the front side of the periphery of the cover, and the movement control means is the side sensor. 2. The driving means is driven based on signals from the transmitting means and the receiving means when the output of the side sensor falls below a predetermined threshold during traveling using the vehicle. Self-propelled vacuum cleaner. The transmission means and the transmission means can detect an object located obliquely forward with respect to the traveling direction of the self-propelled cleaner, and the movement control means is self-propelled from the signals of the transmission means and the reception means. 4. The self-propelled cleaner according to claim 3, wherein a distance between the cleaner and an object is obtained and the driving means is controlled so that the distance becomes a predetermined value. 4. The self-propelled type according to claim 3, wherein a plurality of the transmission means and the transmission means are provided, and the transmission means and the transmission means are alternately arranged on the side surface of the case in the circumferential direction. Vacuum cleaner. The self-propelled cleaner according to any one of claims 1 to 4, wherein the power source is a rechargeable storage battery. The self-propelled cleaner according to any one of claims 1 to 4, wherein a contact sensor that detects that the self-propelled cleaner comes into contact with an object is disposed inside the cover.

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