JPH082339B2 - Electric vacuum cleaner - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric vacuum cleaner that automatically controls an input of an electric blower according to a state of a floor surface.

(B) Conventional technology The pressure in the conventional dust collection chamber is detected by the pressure detection device,
An electric vacuum cleaner that controls the input of an electric blower based on the detected value is disclosed, for example, in Japanese Patent Laid-Open No. 57-75623. However, in such a conventional technique, only the pressure in the intake passage is detected and the input of the electric blower is controlled, and the optimum input control according to the floor surface cannot be performed. That is, in a flooring floor or the like, the suction port easily sticks to the floor surface, and once it sucks, the pressure in the intake path decreases, and as a result, the input of the electric blower becomes larger and the suction port further sticks to the floor surface. There was a drawback that

(C) Problems to be Solved by the Invention The present invention provides an optimum input according to the floor surface by the output of the pressure sensor that detects the pressure on the intake side of the electric blower and the floor sensor that detects the state of the floor surface. The purpose of the present invention is to obtain an electric vacuum cleaner that controls an electric blower.

(D) Means for Solving the Problems In order to solve the above problems, an electric vacuum cleaner according to the present invention includes a pressure sensor that detects the pressure on the intake side of an electric blower, and a floor sensor that determines the type of floor surface. Determine the dust or state and floor type by performing fuzzy inference based on the output of the pressure sensor and the output of the floor sensor,
An electric blower control device for controlling the input of the electric blower according to the determination result is provided.

(E) Operation With the above configuration, in the cleaning operation state, the dust clogging state and the floor type are determined based on the output of the pressure sensor and the output of the floor sensor, and the input of the electric blower is controlled based on the determination result. To do.

Furthermore, based on the outputs of both sensors, fuzzy inference is performed to determine the dust clogging state and the type of floor surface, and the input of the electric blower is determined according to the determination result, so the floor that is close to the human sense The electric blower is controlled by determining the surface type and the dust clogging state.

(F) Example One example of the present invention will be described below in detail with reference to the drawings.

1 is a main body of the electric vacuum cleaner of the present invention, in which a front part is provided with a dust collecting chamber 3 having an upper opening which is opened and closed by a lid 2, and a rear part is in communication with the dust collecting chamber 3 via a ventilation port 4 and a rear part. Blower storage chambers 6 each having an exhaust port 5 on the wall are provided.

Reference numeral 7 denotes an electric blower housed in the blower housing chamber 6, the air intake side 7a of which is in air-tight communication with the dust collection chamber 3. 8
Is a box-shaped filter that is removably housed in the dust collection chamber 3 and has air permeability and shape retention property, and 9 is a paper bag filter that is removably housed in the box-shaped filter 8. Also, 10
Is an intake filter and 11 is an exhaust filter.

Further, reference numeral 12 denotes a suction port portion which is provided in the lid body 2 and rotatably connects the suction hose 13, and includes a suction port 14, a hose coupling cylinder 15 that rotatably holds the suction hose 13, and the hose coupling cylinder 15. And a slide-type shutter plate 16 which is located at the upper part of and which opens and closes the suction port 14.

Reference numeral 17 is a floor suction tool, and a rotating brush 18 and the rotating brush inside.
A brush drive motor 19 for driving 18 is provided, and the cleaner body 1 is connected to the suction port 14 via an extension pipe 20 and a suction hose 13. Reference numeral 21 denotes an operating portion provided in a hand-held portion 22 provided at the tip of the suction hose 13, and a sliding operating portion 23
It has.

Reference numeral 24 denotes a function display unit disposed in the central portion of the upper surface of the cleaner body 2, and the function display unit 24 has a structure in which the display panel plate 25 is illuminated by the back lighting of the light emitting diode. It has a structure that emerges when the light emitting diode is turned on. Then, the function display unit 24
As shown in FIG. 4, it comprises a dust amount display section 26, a power control display section 27, and a fuzzy control display section 28. The dust amount display section 26 includes three light emitting diodes (D1) to (D1).
The amount of dust in the paper bag filter 9 that has been irradiated in 3) is displayed. The fuzzy control display unit 28 is illuminated by the light emitting diode (D4) and is lit when the electric blower 7 is under fuzzy control, and is turned off during manual control. The power control display section
Reference numeral 27 indicates the suction force of the electric blower 7, that is, the input control state, and four light emitting diodes (D5) to (D8)
The four-stage notch display section (weak) (medium) (strong) (high power) corresponding to.

Reference numeral 29 denotes a control board housing portion formed in the upper part of the blower housing chamber 6 of the cleaner body 1, the upper surface of which is covered with the display panel plate 25, the control circuit element 30, ..., The light emitting diodes (D1) to (D1). D8) and a control circuit board 32 on which a reflector 31 is arranged. A semiconductor pressure sensor that is connected to the control circuit board 32 in the space on the intake side 7a of the electric blower 7 via a tube 33 and measures the pressure on the intake side 7a.
34, a current sensor 35 for measuring the electric power of the brush drive motor 19, and a blower control triac 37 in which a heat dissipation plate 36 is located in the space on the intake side 7a are attached.

Next, 38 will be described with reference to the circuit block diagram shown in FIG. 1 and the flow chart shown in FIG.
Then, the microcomputer is one in which an arithmetic processing unit, an input / output unit, a storage unit and the like are integrated into one chip.

The operation notch setting unit 39 is operated by the sliding operation unit 21 and includes a slide volume (not shown) that controls the input of the electric blower 7. The slide volume changes the signal voltage input to the microcomputer 38 according to the position of the slider to change the input of the electric blower 7, and includes a stop position “off”, a fuzzy control position “fuzzy”,
A signal voltage corresponding to each of the manual control positions "weak to high power" is input to the microcomputer 38.

Reference numeral 40 denotes a pressure detection unit that uses the semiconductor pressure sensor 34 to detect a change in pressure on the intake side 7a of the electric blower 7.

Reference numeral 24 is the above-mentioned function display section, and 41 is the display section drive section. The four light emitting diodes (D5) to (D8) of the power control display unit 27 change the number of lights according to the signal voltage of the operation notch setting unit 39 to display the input control state.

42 is a blower drive unit, and 43 is a blower control triac.

Further, 44 is a current detection portion (floor sensor) of the brush drive motor 19, which is used for cleaning the rotating brush 18 depending on the type of floor surface being cleaned, such as long-bristle tufts, short-bristle tufts, tatami mats and flooring. The change is detected, and the current value of the brush drive motor 19 is changed accordingly. The current detection unit (floor sensor) 44 is composed of a current sensor 45 and a peak hold circuit 46, and after the detection value detected by the current sensor 45 is noise-removed by a filter, the peak hold circuit 46 holds the peak value, It is input to the microcomputer 38 every half cycle of the power supply frequency. In addition,
When the input to the microcomputer is complete, the peak hold circuit is reset to prepare for the next current detection.

Next, the operation of the above configuration will be described. First, when the sliding operation portion 23 of the operation notch setting portion 39 is operated to set the fuzzy control position to "fuzzy", the voltage Vp corresponding to the pressure P detected by the semiconductor pressure sensor 34 is read into the microcomputer and the brush driving is performed. The current Ip of the motor 19 is read from the current detection unit 44 into the microcomputer 38.

In the microcomputer 38, it is compared with the comparison minimum value I refmin of the brush drive motor current stored in the storage unit, and when Ip is larger, it is further compared with the comparison reference value I ref. At this time, if Ip is smaller, this Ip value is replaced with I ref, and if Ip is larger, I ref-Ip is calculated as it is, and the calculation result value is set to Ia.

Next, if Ia is greater than the current I lock stored in the storage unit when the brush of the brush drive motor is locked (the state in which the brush is stopped due to entanglement of cloth breakage, etc.),
A motor lock timer (not shown) incorporated in the microcomputer starts counting to determine whether or not the rotary brush is in a locked state. When Ia is smaller than I lock, the motor lock timer is cleared and the process proceeds to the next state. When the value of the motor lock timer exceeds a predetermined value (for 5 seconds in this embodiment), it is determined that the rotary brush is locked, and the power supply of the brush drive motor 19 is stopped to prevent the brush drive motor 19 from being burnt. And set the value of Ia to 0
To On the contrary, when it is determined that the brush drive motor 19 is not in the locked state, the detection value of the semiconductor pressure sensor 34 is detected.
Vp is calculated by comparing Vp with the comparison reference value Vref of the semiconductor pressure sensor 34 stored in the storage unit in the microcomputer 38 to calculate Vref-Vp.

Even in this way, the blower controller 47 is controlled based on the determined Ia and Va based on the lookup table (FIG. 8) stored in the microcomputer to control the input of the electric blower 7.

Next, a method of deriving the look-up table (FIG. 8) necessary for fuzzy control will be described. First,
The production rules for fuzzy reasoning are shown below.

Rule (1) if pressure is small and current is small then input is medium Rule (2) if pressure is small and current is large then input is large Rule (3) if pressure is medium and current is slightly small then input is slightly large Rule (4) if pressure is medium and current is medium then input is large rule (5) if pressure is slightly large and current is medium then input is large Rule (6) if pressure is large and current is very small then input is small Rule (7) if current is very small then input is small The input of the condition part in this case is the detected value of the semiconductor pressure sensor 34 and the current value of the brush drive motor 19 that changes according to the condition of the floor surface to be cleaned. . In addition, the conclusion part is electric blower 7
Corresponding to the conduction angle of the blower control triac 43.

The condition part membership function is shown in FIGS. 9 (a) to 9 (b), and the conclusion part membership function is shown in FIG. Based on these membership functions, the MAX-MIN composition method is used for inference, and the center of gravity method is used for determination (defuzzifier processing). That is, the reasoning for the pressure P and the current I of the brush drive motor is shown in FIGS. 11 (a) to 11 (g). FIG. 11 (h) shows the result of obtaining the definite value by taking the logical sum of the inference results for each production rule. Here, the center of gravity of the shaded area (logical sum) in FIG. 11 (h) is taken, and this value is used as the final value (conduction angle (θ °) of the blower control triac).

Note that the above fuzzy reasoning is applied to all possible pressures P,
The result of calculation of the current I of the brush drive motor is displayed in the look-up table described above.

Next, when the sliding operation section 23 of the operation notch setting section 39 is operated to set the manual control position "weak to high power", a signal corresponding to the control position is input to the microcomputer 38, and based on the value. Fan drive unit 42 and fan control triac 43
Is controlled, and electric power corresponding to each manual control position is input to the electric blower 7.

As described above, in this embodiment, the intake side 7a of the electric blower 7 is
Although the method of controlling the input of the electric blower to an optimum value according to the floor surface by fuzzy inference between the pressure P of the above and the current I of the brush drive motor 19 has been described, the conventional control method (for example, pressure All combinations of P and current I are stored, and a method of controlling the electric blower according to the combination is calculated from the pressure P on the intake side 7a of the electric blower 7 and the current I of the brush drive motor 19. Even if the input of the electric blower 7 is controlled by the above, the input can be controlled according to the floor surface.

In the embodiment, as the floor sensor, the current of the rotary brush drive motor is detected, but other than this, for example,
It may be used as a floor sensor by detecting the friction coefficient of the floor surface or the uneven portion.

(G) Effect of the Invention The vacuum cleaner of the present invention is configured as described above,
Since the pressure of the intake side of the electric blower and the current of the brush drive motor are detected and the input of the electric blower is controlled from the calculation result of the detected value, the input value of the electric blower is controlled to the optimum value according to the floor condition. can do.

In addition, fuzzy inference makes it easy to automatically control the electric blower based on human experience and intuition by a simple membership function calculation, eliminating the need for complicated control equations and enormous memory.

[Brief description of drawings]

FIG. 1 is a block diagram of a controller of an electric vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a flowchart of the same, FIG. 3 is an overall view of the electric vacuum cleaner, and FIG. 5 and 5 are sectional views of the same, FIG. 6 is a front view of a hand-held portion of the electric vacuum cleaner, FIG. 7 is a partial sectional view of a floor suction tool of the electric vacuum cleaner, and FIG. 8 is the electric vacuum cleaner. Of the look-up table which is the fuzzy inference result of FIG. 9, FIG. 9 (a) and FIG.
(B) is a diagram showing a condition part membership function of the vacuum cleaner, FIG. 10 is a diagram showing a conclusion part membership function of the vacuum cleaner, and FIGS. 11 (a) to 11 (h). Each of the figures is an explanatory view schematically showing the process of fuzzy inference. 7: Electric blower, 7a: Intake side, 34: Pressure sensor (semiconductor pressure sensor), 44: Floor sensor (current detection part), 38: Electric blower control device (microcomputer).

Claims (1)

[Claims] 1. A pressure sensor for detecting the pressure on the intake side of an electric blower, a floor sensor for determining the type of floor surface, and a fuzzy inference based on the output of the pressure sensor and the output of the floor sensor. An electric vacuum cleaner comprising: an electric blower control device that determines a dust clogging state and a floor type, and controls an input of the electric blower according to the determination result.