JPH07112469B2 - 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 An electric vacuum cleaner that detects a change in the current of a rotary brush drive motor of a conventional floor suction tool and automatically controls the input of an electric blower by this detection output is disclosed in, for example, Japanese Patent Laid-Open No. 64-52430. It is shown in the official gazette.

However, during normal cleaning, the current change of the rotary brush drive motor is extremely small, and there is almost no change particularly when the average current is taken. Therefore, in the related art as described above, since the input of the electric blower is simply controlled in proportion to the current of the rotary brush drive motor, the input of the fine electric blower corresponding to the type of the floor surface is controlled. I couldn't control it.

(C) Problem to be Solved by the Invention According to the present invention, the peak value of the current flowing in the motor for driving the rotary brush is detected and arithmetic processing is performed, and the input of the electric blower is set to the optimum input according to the state of the floor surface. The purpose is to obtain an electric vacuum cleaner that is controlled to be.

(D) Means for Solving the Problems In order to solve the above problems, an electric vacuum cleaner according to the present invention includes a floor suction tool having a rotating brush and a brush drive motor for driving the rotating brush, an electric blower, and a collector. A cleaner body having a dust chamber, a current sensor for detecting a current flowing through the brush drive motor, a peak hold circuit for detecting a peak value of the current sensor output value at constant time intervals, and an output of the peak hold circuit An electric blower control circuit for fuzzyly calculating a value to control the input of the electric blower.

(E) Operation With the above configuration, in the vacuum cleaner operating state, the peak value of the current flowing through the brush drive motor is obtained by the peak hold circuit from the output value detected by the current sensor that detects the current of the brush drive motor. The electric blower control circuit performs a fuzzy calculation on the value to determine the state of the floor surface, and controls the electric blower to the optimum input for the floor surface.

(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.

7 is an electric blower stored in the blower storage chamber 6,
The intake side 7a communicates with the dust collection chamber 3 in an airtight manner. Reference numeral 8 denotes a box-shaped filter having breathability and shape retention which is detachably housed in the dust collecting chamber 3 and 9 is a paper bag filter which is housed in the box-shaped filter 8 detachably. Further, 10 is an intake filter and 11 is an exhaust filter.

Further, reference numeral 12 denotes a suction port portion provided on the lid body 2 and rotatably connecting the suction hose 13. The suction port 14 and the suction hose.
It comprises a hose connecting tube 15 that holds the tube 13 rotatably, and a slide-type shutter plate 16 that is located above the hose connecting tube 15 and that opens and closes the suction port 14.

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

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. The function display section 24 comprises a dust amount display section 26, a power control display section 27, and a fuzzy control display section 28, as shown in FIG. The dust amount display section 26 includes three light emitting diodes (D1) to (D3).
The amount of dust in the paper bag filter 9 that has been irradiated with 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 unit 27 displays the suction force of the electric blower 7, that is, the input control state, and includes four notch display units (weak) (weak) (four) corresponding to the four light emitting diodes (D5) to (D8). It consists of medium, strong, and high power.

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 the control circuit board 32 on which the reflection plate 31 is arranged. Further, a semiconductor pressure sensor that is connected to the control circuit board plate 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 current 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, description will be given based on the circuit block diagram shown in FIG. 1 and the flowchart shown in FIG.

38 is a microcomputer (hereinafter referred to as a microcomputer),
The microcomputer has an arithmetic processing unit, an input / output unit, a storage unit, and the like integrated into one chip.

The operation notch setting unit 39 is operated by the sliding operation unit 21,
A slide volume (not shown) for controlling the input of the electric blower 7 is provided. The slide volume changes the input voltage of the electric blower 7 by changing the signal voltage input to the microcomputer 38 according to the position of the slider.
A signal voltage corresponding to each of the stop position "OFF", the fuzzy control position "fuzzy", and the manual control position "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 load of the rotary 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.

47 is a commercial power source and is input to the microcomputer 38 via the power source section 48. Reference numeral 49 is a zero-cross signal generator, which is input to the microcomputer 38 for controlling the blower control triac 43 and detecting the current peak value in the current detector 44.

Next, a method for detecting the peak value of the current of the brush drive motor 19 will be described. FIGS. 8 (a) to 8 (e) show that the floor suction device 17 is unloaded (a), the floor is the floor (b), the fur with short naps (c), and the middle of the nap. It is a current waveform of the brush drive motor 19 when the furrow (d) and the furrow (e) with long bristles are cleaned.

When cleaning the carpet, if the floor suction device 17 is reciprocated back and forth (push and pull), from the return route to the forward route (push to push)
The current value is the largest when reversing, and the next current flows when reversing from the forward path to the return path. Further, when the floor suction device is moved in one direction, almost the same current value is shown regardless of the length of the fluff. Therefore, in order to detect the state of the floor surface by the current value of the brush drive motor 19, in the present embodiment, the peak value of the current for each half cycle of the power supply frequency or for each cycle is set to the half cycle of the power supply frequency or for each cycle. Is detected. The peak value of the current thus detected is the maximum of a time (1.5 seconds in this embodiment) slightly longer than the average time required for one stroke when cleaning the floor suction tool 17 by reciprocating in the front-back direction. The value of the floor is judged by detecting the value.

FIGS. 9 (a) to 9 (e) are waveform charts of each part in the current detection unit 44 for each half cycle.

FIG. 9 (f) is shown in FIG. 9 (c), FIG. 9 (d), and FIG.
It is an expanded waveform diagram which shows the mutual relationship of (e) figure.

The current sensor 45 detects a voltage proportional to the current of the brush drive motor 19 (Fig. 9 (a)). This detected voltage is input to the peak hold circuit. Peak hold circuit 46
Then, the peak value of each detected voltage is input to the microcomputer 38 based on the zero-cross signal from the microcomputer 38, and then the peak value is reset based on the reset signal from the microcomputer 38.

Next, the calculation processing method inside the microcomputer 38 of the output of the peak hold circuit 46 which is proportional to the current of the brush drive motor 19 will be described with reference to the flowchart of FIG. 2 (b).

First, put a constant Iconst in the average value Iave and the maximum value Imax of the current and start the timer for 1.5 seconds. Next, the current of the brush drive motor 19 (in this embodiment, the peak hold circuit
(Detection voltage of 46) Half-cycle peak value In is read,
The peak value In ₋₁ of the last half cycle of In and the peak value In ₋₂ of the last half cycle of In are averaged to obtain Iave.

When Iave is 0 (because the current of the brush drive motor 19 is 0, the brush drive motor 19 is stopped or stopped due to some failure), Ia is set to 0 and the process returns to the main routine.

If Iave is not 0, it is compared with Imax, and if Iave is larger, Imax is updated.

The above processing is performed for 1.5 seconds (normally, the time required for one stroke to reciprocate the floor suction tool back and forth is about 1 second, and if 1.5 seconds, the peak value of the current of the brush drive motor 19 exists)
Then, the maximum value of Imax during this period is calculated, this is replaced with Ip, and the process returns to the main routine.

Next, the operation of the main routine 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 Irefmin 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 Iref. This time
When Ip is smaller, this Ip value is replaced as Iref, and when Ip is larger, Iref-Ip is calculated as it is, and the calculated result value is set to Ia.

Next, if Ia is greater than the current Ilock stored in the storage unit when the brush of the brush drive motor is locked (the state in which the cloth is entangled and the brush is stopped), the rotary brush is in the locked state. Motor lock timer (not shown) built in the microcomputer to determine whether or not
Start counting. If Ia is smaller than Ilock, clear the motor lock timer and proceed to the next state. The value of the motor lock timer is a predetermined value or more (5 in this embodiment).
(Second), 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 the value of Ia is set to 0. On the contrary, when it is determined that the brush drive motor 19 is not in the locked state, the detected value Vp of the semiconductor pressure sensor 34 is compared with the comparison reference value Vref of the semiconductor pressure sensor 34 stored in the storage unit in the microcomputer 38. Then, Vref−Vp is calculated to obtain Va.

Even in this manner, the blower controller 47 is controlled based on the determined Ia and Va based on the lookup table (FIG. 10) stored in the microcomputer to control the input of the electric blower 7.

Next, a method of deriving a look-up table (Fig. 10) necessary for fuzzy control will be described. First, the production rules for fuzzy inference are shown below.

Rule (1) if pressure is small and current is small then medium input rule (2) if pressure is small and current is large then input large Rule (3) if pressure is medium and current is slightly small then input Large (4) if pressure is medium and current is medium then input large rule (5) if pressure is slightly large and current is medium then input large rule (6) if pressure is slightly large and current is very small then input 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 which changes according to the condition of the floor to be cleaned. is there. 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 Fig. 11 (a) and
It is shown in Fig. 11 (b), and the conclusion part membership function is shown in Fig. 12. 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. 13 (a) to 13 (g). The result of obtaining the definite value by taking the logical sum of the inference results for each production rule is shown in FIG. 13 (h). Here, the center of gravity of the shaded area (logical sum) in FIG. 13 (h) is taken, and this value is used as the definite value (the conduction angle (θ °) of the blower control triac). The look-up table above shows the results of the fuzzy inference calculated for all possible pressures P and brush drive motor currents I.

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. Then, the blower drive unit 42 and the blower control triac 43 are controlled, and electric power corresponding to each manual control position is input to the electric blower 7.

As described above, in this embodiment, the input P of the electric blower is set to the optimum value according to the floor surface by fuzzy inference between the pressure P on the intake side 7a of the electric blower 7 and the current I of the brush drive motor 19. Although the control method has been described, the intake of the electric blower 7 is controlled by a conventional control method (for example, a method of storing all combinations of the pressure P and the current I and controlling the electric blower according to the combination). Even if the input of the electric blower 7 is controlled by calculating from the pressure P on the side 7a and the current I of the brush drive motor 19, it is possible to control the input according to the floor surface.

(G) Effect of the Invention The electric vacuum cleaner of the present invention is configured as described above, the current of the brush drive motor is detected by the current sensor, and the input of the electric blower is controlled based on the peak value of the detected value. Therefore, it is possible to make a detailed determination of the condition of the floor surface and control the optimum input value of the electric blower accordingly.

[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, FIGS. 2 (a) and 2 (b) are the same flow charts, and FIG. 3 is an overall view of the electric vacuum cleaner. FIG. 4 is a top view of the same electric vacuum cleaner body, FIG. 5 is a sectional view of the same, and FIG.
FIG. 7 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 FIGS.
FIG. 9 (e) is a diagram showing a current waveform of the brush drive motor, and FIGS. 9 (a) to 9 (e) are waveform diagrams showing a brush drive motor current waveform and an output waveform of the peak hold circuit, respectively. 9 (f) is shown in FIG. 9 (c), FIG. 9 (d), and FIG.
FIG. 10 (e) is an enlarged waveform diagram showing the mutual relationship, FIG. 10 is a diagram showing a look-up table which is a fuzzy inference result of the electric vacuum cleaner, and FIGS. 11 (a) and 11 (b) are respectively The figure which shows the conditional part membership function of the same vacuum cleaner, FIG. 12 is the figure which shows the conclusion part membership function of the same vacuum cleaner,
FIGS. 13 (a) to 13 (h) are explanatory views schematically showing the process of fuzzy inference. 18 ... Rotating brush, 19 ... Brush drive motor, 17 ... Floor suction tool, 3 ... Dust collection chamber, 1 ... Vacuum cleaner body, 45 ... Current sensor, 46 ... Peak hold circuit, 38 ... … Electric blower control device (microcomputer).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 64-52430 (JP, A) JP 2-7932 (JP, A) JP 3-297432 (JP, A)

Claims (1)

[Claims] 1. A vacuum cleaner body having a floor suction tool having a rotary brush and a brush drive motor for driving the rotary brush, a cleaner body having an electric blower and a dust collecting chamber, and a current flowing through the brush drive motor is detected. A current sensor, a peak hold circuit that detects a peak value of the current sensor output value at regular time intervals, and an electric blower control circuit that fuzzy-calculates the output value of the peak hold circuit to control the input of the electric blower. Become a vacuum cleaner.