JPH10229961A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of sucking in dusts at a given suction force, even if a mechanical pressure sensor is used to change the kind and state of a surface subject to cleaning. SOLUTION: This vacuum cleaner detects a pressure in the air route with a pressure sensor 17 having a hysteresis in the pressure detection characteristics, and controls an electric motor 14 based on the output signals corresponding to the pressure detected via this pressure sensor 17 to suck in dust. Depending either on the output signal value's increment or decrement period then, a controller 35 is set to change the output signal values, based on which it controls the electric motor 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for controlling an electric motor using a pressure sensor having hysteresis in pressure detection characteristics.

[0002]

2. Description of the Related Art A vacuum cleaner having a pressure sensor for detecting the pressure of a dust collection chamber has been known. Such a vacuum cleaner controls the electric motor based on the pressure detected by the pressure sensor. By this control, the dust is collected with an appropriate suction force according to the clogged state of the dust collecting filter and the type of the surface to be cleaned. Can be sucked.

[0003]

The pressure sensor includes a semiconductor pressure sensor made of a semiconductor and a mechanical pressure sensor. The semiconductor pressure sensor can accurately detect the pressure in the dust collection chamber, but has a problem that it is expensive.

On the other hand, in a mechanical pressure sensor, as shown in FIG. 20, a rubber piston 2 and a spring 3 for urging the piston 2 are provided in a cylinder 1, and a rod 4 of the piston 2 and a sliding resistance are provided. 5 is connected to the sliding terminal 5A, the inside 1A of the cylinder communicates with the dust collection chamber, and the inside 1B of the cylinder communicates with the outside air. Then, the piston 3 is moved against the spring 3 in accordance with the negative pressure of the dust collection chamber, and the pressure of the dust collection chamber is detected from the voltage of the sliding terminal 5A corresponding to the movement position of the piston 3. .

Although this mechanical pressure sensor is inexpensive,
Due to the friction between the cylinder 1 and the piston 2, the friction between the sliding resistance 5 and the sliding terminal 5A, the partial distortion of the spring 3, etc., a large hysteresis occurs in the pressure detection characteristics, and accurate pressure detection can be performed. Can not. For this reason, when a mechanical pressure sensor is used, there is a problem that the electric motor cannot be properly controlled according to the clogged state of the dust collecting filter and the type of the surface to be cleaned.

The present invention has been made in view of the above problems, and an object of the present invention is to use a mechanical pressure sensor to control an electric motor according to the clogged state of a dust collecting filter and the type of a surface to be cleaned. An object of the present invention is to provide a vacuum cleaner that can be appropriately controlled.

[0007]

According to a first aspect of the present invention, a pressure sensor having hysteresis in pressure detection characteristics detects a pressure in an air passage, and responds to the pressure detected by the pressure sensor. A vacuum cleaner that controls the electric motor based on the output signal and sucks dust.
The value of the output signal is changed depending on whether the value of the output signal is increasing or decreasing, and the electric motor is controlled based on the output signal having the changed value.

According to a second aspect of the present invention, a pressure sensor having hysteresis in the pressure detection characteristic detects the pressure in the air passage, and controls the electric motor based on an output signal corresponding to the pressure detected by the pressure sensor to control the dust. When the value of the output signal changes from increasing to decreasing or increasing from decreasing, a predetermined value is added to the signal value at the time of the change. The electric motor is controlled based on the added signal value.

According to a third aspect of the present invention, when the output signal indicating that the negative pressure in the dust collecting chamber has changed from the increasing state to the decreasing state is output from the pressure sensor, the electric motor is driven by the electric motor. Characterized in that the power supplied to the power supply is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vacuum cleaner according to the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a vacuum cleaner main body.
Inside the main body 10, an electric blower 11, a dust filter 12 attached to a dust collection chamber 16, a pressure sensor 17 for detecting the pressure of the dust collection chamber (air passage) 16, an electric motor 14 of the electric blower 11, A power supply device 30 (see FIG. 2) for supplying electric power to the brush motor 15 and the like are provided. Pressure sensor 1
Reference numeral 7 denotes a mechanical type, which has an output voltage V and a pressure H of the dust collection chamber 16.
FIG. 18 shows a characteristic indicating the relationship with. L1 is the dust collection chamber 16
L2 shows the characteristics when the pressure (negative pressure) of the dust collecting chamber 16 is decreasing, and L2 shows the characteristics when the pressure (negative pressure) of the dust collecting chamber 16 is decreasing. As described above, even when the output voltage V is the same when the negative pressure is increasing and when the negative pressure is decreasing, the negative pressure H is considerably larger when the negative pressure is increasing. That is, it has a large hysteresis.

Reference numerals 21 to 25 denote a hand operation unit 20 of the hose 13.
, An operation switch (setting means) composed of a touch switch provided at a switch 21; an off switch 21; a weak switch 22;
23 is a strong switch, 24 is an automatic switch, and 25 is a power brush switch. The operation switches 22 to 25 are for setting the magnitude of electric power supplied to the electric motor 14 of the electric blower 11.

FIG. 2 is a block diagram showing the configuration of the power supply device 30. In FIG. 2, reference numeral 31 denotes an AC power supply, 32 denotes a full-wave rectifier circuit for rectifying an AC voltage of the AC power supply 31, and 33 denotes a rectified rectifier. A zero-crossing detection circuit for detecting a zero-crossing point from the voltage and outputting a zero-crossing pulse at the zero-crossing point; This is a switch circuit for passing an AC current.

Reference numeral 35 denotes a control unit (control means) including a CPU and the like. The control unit 35 includes operation switches 21 to 25.
Controls the electric power supplied to the electric motor 14 based on the operation of the motor and the detection signal (output voltage) from the pressure sensor 17,
The on / off of the switch circuit 36 is controlled.

Next, the operation of the vacuum cleaner will be described with reference to the flowcharts of FIGS. In the drawings, steps are denoted by S.

When the power supply is connected, the main routine starts. In step 1, ad, u, v, w, y = 0, and A to E
= 0 is set. Then, the hand reading processing routine of step 2 is performed, and thereafter, the operation processing routine of step 3 is performed. The routine of steps 2 and 3 is repeatedly performed.

In the hand reading processing routine, when the operation switches 21 to 25 are pressed (operated), A to E = 1 are set according to the operation switches 21 to 25. For example, when the off switch 21 is pressed, step 1
If it is 0, it is determined as yes, and in step 15, A = 1, B ~
E = 0 is set. Then, the process returns to the main routine.
Similarly, when the weak switch 22 to the power brush switch 25 are pressed, YES is determined in steps S11 to S14, B to E are set to "1" in steps S16 to S19, and the process returns to the main routine. Operation switches 21 and 2
If none of the buttons 5 is pressed, it is determined NO in steps 10 to 14 and the process returns to the main routine, and the routines of steps 2 and 3 are repeated until the operation switches 21 to 25 are pressed.

In the operation processing routine, each processing is performed according to the setting of A to E, that is, according to the operation of each of the operation switches 21 to 25. For example, if A = 1 has been set, the determination in step 20 is affirmative, and the process proceeds to step 25.
4), and the process returns to the main routine. Similarly, if “1” is set in any of B to E, “yes” is determined in any of steps 21 to 24 corresponding thereto, and step 26 is performed.
Go to step 29. Then, in each of steps 26 to 29, "weak processing", "strong processing", "automatic processing I, automatic processing II (step 30)", and "brush processing" are performed, and the process returns to the main routine.

When all of A to E are set to "0", that is, when the operation switches 21 to 25 have never been operated, it is determined NO in steps 20 to 24 and the process returns to the main routine. .

The "weak process" of step 26 is to control the triac 34 to suck the dust with a relatively weak suction force to reduce the electric power supplied to the electric motor 14, and in this case, the dust collection chamber 16 A constant power is supplied regardless of the pressure fluctuation.

The "brush process" of step 29 is to drive the brush motor 15 by turning on the switch circuit 36.

In the "strong processing" of step 27, as shown in FIG. 6, a polarity determination routine of the pressure change of step 31 is performed, and then an input processing (strong) routine is performed in step 32. Then, after performing the process of step 32, the process returns to the main routine.

When the process proceeds to the pressure change polarity determination routine, it is determined in step 40 whether or not the count number T of the internal timer counter is 0, as shown in FIG. At start-up, T = 0 since the internal timer counter has not started counting yet. Therefore, the determination in step 40 is “yes” and the process proceeds to step 41. Step 4
At 1, the internal timer counter starts counting, and the output voltage V output by the pressure sensor 17 at this time is set as V1.

In step 42, it is determined whether or not T has elapsed for one second or more. If yes, the process proceeds to step 43, and if no, the process proceeds to the input processing routine (strong) in step 32. In step 43, T = 0 is set, and the detection voltage V output from the pressure sensor 17 at this time is set as V2.

In step 44, it is determined whether or not V2 is equal to or more than V1 + β. If no, the process proceeds to step 47, and if yes, the process proceeds to step 45. Here, β is a voltage set in advance and is a value based on a detection error caused by hysteresis of the pressure sensor 17 (see FIG. 19).

At step 45, it is determined that the pressure (negative pressure) is increasing or there is no change. At step 46, a = 0 is set, and the routine proceeds to step 32. If NO is determined in step 44, it is determined in step 47 that the pressure (negative pressure) is decreasing,
In step 48, a = 1 is set, and the flow advances to step 32.

That is, in steps 42 to 44, the output voltage of the pressure sensor 17 is read every second and the output voltage of the pressure sensor 17 at the present time is compared with the output voltage of the pressure sensor 17 one second before. To determine whether the negative pressure is rising or falling, and
In steps 45 to 48, a = 0 is set when the negative pressure of the dust collection chamber 16 is increasing or not changing, and when the negative pressure of the dust collection chamber 16 is decreasing, a = 1
Is set.

When the strong switch 23 is operated, the
As shown in FIG. 8, it is determined at step 50 whether or not the detection voltage V output from the pressure sensor 17 is equal to or higher than Va, and if no, the process proceeds to step 51. If yes, go to step 52. In step 51, the electric power Pa supplied to the electric motor 14 is set. Based on this setting, the triac 34 is controlled, and the process returns to the main routine.

In step 52, it is determined whether or not the detected voltage V output from the pressure sensor 17 is equal to or higher than Vb. If no, the process proceeds to step 53, and if yes, the process proceeds to step 55. Here, Va and Vb are preset voltages, and Va <Vb.

At step 53, it is determined whether or not a = 1. That is, it is determined whether the negative pressure of the dust collection chamber 16 is rising (or not changing) or falling. If the determination is yes in step 53, the process proceeds to step 51, and if the determination is no, the process proceeds to step. In step 54, the electric power Pb (Pa <P
b) is set, and based on this setting, the triac 34
Is returned to the main routine.

In step 55, it is determined whether or not a = 1. If yes, the process proceeds to step 54, and if no, the process proceeds to step 56. In step 56, the electric power Pc (Pb <Pc = full power) supplied to the electric motor 14 is set, and based on this setting, the triac 3
4 is controlled to return to the main routine.

In steps 50, 52, 53 and 55, when the negative pressure is rising, as shown in FIG. 16, the setting of the electric power P supplied to the electric motor 14 is indicated by Pa, Pb, as shown by the solid line.
When the negative pressure is falling, the setting of the electric power P supplied to the electric motor 14 is decreased so as to be Pb, Pc as indicated by a broken line. It is.

This is because when the pressure is increasing, the setting of the electric power P is increased so as to be Pa, Pb, Pc, thereby suppressing the initial input and reaching the full power where the power is maximized. Is to do so.

That is, when the electric power is set to a relatively small Pa at the time of start-up (with the conduction angle of the triac 34 kept constant) and the electric motor 14 is driven, as shown in FIG. Along with this, the negative pressure of the dust collection chamber 16 decreases. The supplied power at this time may be considerably smaller than that of the Pc line, and the supplied power at the time of startup can be reduced. When the negative pressure becomes H1, the output voltage of the pressure sensor 17 becomes Va, and the negative pressure increases along the Pb line Q2. When the negative pressure becomes H2, the output voltage of the pressure sensor 17 becomes Vb, the supply power Pc which is full power is set, and the negative pressure increases along the Pc line Q3 to enter a region S where the power is maximized. Then, when the supplied power reaches the full power, it immediately enters the region S where the power is maximized because the negative pressure is equal to or higher than H2.
The region S is unique to the vacuum cleaner determined by the product of the air volume and the negative pressure.

As described above, the Pa line Q1 and the Pb line Q2
, The power can be moved to the region S where the power is maximized, so that much less power consumption is required as compared with going directly from the Pc line to the region S.

When the negative pressure decreases from the full power state, the supply power increases along the Pc line Q3 as the negative pressure decreases. However, when the negative pressure becomes H2, the supply power becomes smaller than Pc. Power Pb is set. As a result, the supplied power increases along the Pb line Q2. For this reason, PM
The supply of power greater than 1 is prevented. Further, when the negative pressure becomes H1, a supply power Pa smaller than Pb is set, and as a result, the supply power increases along the Pa line Q1, preventing the supply of power larger than PM2. .

That is, when the negative pressure decreases, the supply power increases only for the hysteresis, but when the negative pressure decreases more than the hysteresis, the supply power setting is switched to a lower one. In addition, it is possible to suppress an increase in supply power due to a decrease in negative pressure, and to prevent the electric motor 14 from being heated.

Step 2 is performed when the automatic switch 24 is operated.
When the process proceeds from step 3 to step 28, the processing of the automatic processing routine I shown in FIG. 9 is performed. This automatic processing routine I
Processing of a pressure change polarity determination routine in step 60;
Processing of an input processing (automatic) I routine in step 61;
The input process (automatic) II routine in step 62 is performed, and thereafter, the process returns to the main routine.

The processing of the polarity change routine of the pressure change in step 60 is the processing operation shown in FIG.

Upon entering the input processing (automatic) I routine of step 61, the processing shown in FIG. 10 is performed. That is, in step 70, it is determined whether or not a = 1, that is, whether or not the negative pressure is increasing or decreasing. If yes, proceed to step 73; Proceed to step 71. In step 73, the pressure sensor 1
The value obtained by subtracting β from the output voltage V output from 7 is set to V. That is, when the pressure (negative pressure) is decreasing, the output voltage of the pressure sensor 17 is higher than when the negative pressure is increasing (see FIGS. 18 and 19).

Here, β is a value determined substantially at the midpoint of the range that H can take as shown in FIG.

In step 71, it is determined whether or not the output voltage V output from the pressure sensor 17 is equal to or higher than a preset Vj1. If yes, the process proceeds to step 74, and if no, the process proceeds to step 72. In step 72, the electric power P supplied to the electric motor 14 is set to P1, the triac 34 is controlled so that the supplied electric power becomes the set P1, and the process proceeds to step 30 (see FIG. 5).

In step 74, it is determined whether or not the output voltage V is equal to or higher than a preset Vj2. If yes, the process proceeds to step 76, and if no, the process proceeds to step 75. In step 75, the electric power P supplied to the electric motor 14 is set to P2, and the triac 34 is controlled so that the supplied electric power becomes the set P2.
Proceed to. In step 76, it is determined whether or not the output voltage V is equal to or higher than a preset Vj3. If yes, the process proceeds to step 78, and if no, the process proceeds to step 77. In step 77, the electric power P supplied to the electric motor 14 is set to P3, and the triac 34 is controlled so that the supplied electric power becomes the set P3.

In step 78, it is determined whether or not the output voltage V is equal to or higher than a preset Vj4. If yes, the process proceeds to step 80, and if no, the process proceeds to step 79. In step 79, the electric power P supplied to the electric motor 14 is set to P4, and the triac 34 is controlled so that the supplied electric power becomes the set P4.
Proceed to. In step 80, the electric power P supplied to the electric motor 14 is set to P5, and the triac 34 is controlled so that the supplied electric power becomes the set P5. Note that Vj1 <Vj2 <Vj3 <Vj4 <V
j5, P1 <P2 <P3 <P4 <P5.

Here, the processing in steps 71, 74, 76 and 78 is for obtaining the clogged state of the dust collecting filter 12 which is the pressure of the dust collecting chamber 16, and the processing in steps 72, 75 and 7 is carried out.
7, 79 and 80 control the electric power supplied to the electric motor 14 according to the clogging state. That is, if the amount of clogging is large, the supply power of the electric motor 14 is set large so that dust can be sucked with a constant suction force regardless of the state of clogging.

When the negative pressure is rising, the state shown in FIG.
When the negative pressure is falling, the characteristic output from the pressure sensor 17 is the line L2. Therefore, the control is performed along the line L2. However, in step 73, the pressure sensor 17
Is subtracted from the output voltage V, the same state as when the electric motor 14 is controlled based on the characteristic L1 when the negative pressure is falling is the same as when the negative pressure is rising.

That is, even when the negative pressure is falling, the electric motor 14 can be properly controlled according to the negative pressure in the dust collection chamber 16 without being affected by the hysteresis. In other words, the dust collection filter 1 is not affected by the hysteresis.
2 can be accurately determined, and therefore, the electric motor 14 can be appropriately controlled according to the clogged state of the dust filter 12.

In step 30 (see FIG. 5), the processing shown in FIG. 11 is performed. In FIG. 11, sampling processing is performed in step 81, polarity determination processing II of pressure is performed in step 82, polarity change processing is performed in step 83, and input processing (automatic) II is performed in step 84.
Is performed.

The sampling process in step 81 is performed as shown in FIG.
2 is performed. In FIG. 12, in step 85, it is determined whether or not the zero-cross detection circuit 33 has output a zero-cross pulse. If no, the process returns to the main routine, and if yes, the process proceeds to step 86. In step 86, "1" is added to n. If the zero-cross pulse is the first, n = 0 and n = 0 + 1 = 1.

In step 87, it is determined whether or not n is equal to or greater than "10". If no, the process returns to the main routine. If yes, the process proceeds to step 88. Step 85
Steps 87 to 87 are repeated until the count number of the zero-cross pulse reaches “10”. In step 88, n = 0 is set, and the routine proceeds to step 82.

That is, since the zero-cross pulse is output every 0.01 seconds, n = 0 is set every 0.1 seconds, and the routine proceeds to step 82.

The pressure polarity discrimination processing routine of step 82 (see FIG. 11) performs the processing shown in FIG. In FIG. 13, in step 90, “1” is added to m. Since m = 0 at the initial stage, m = 0 + 1 = 1. In step 91, the output voltage Vm output from the pressure sensor 17 is set as V. In step 92, m =
It is determined whether it is 1 or not.
Go to step 8; if no, go to step 93.

At step 98, the output voltage V output from the pressure sensor 17 when m = 1 is set as Vmin and Vmax, and the routine proceeds to step 83.

In step 93, it is determined every 0.1 second whether Vm-1 is equal to or higher than Vm + A1, that is, whether the negative pressure is increasing (or not changing) or decreasing.
If no, go to step 94; if yes, go to step 96. That is, in step 93, the predetermined voltage A1 is added to the previous output voltage Vm-1 and the current output voltage Vm.
And A1 is for canceling a simple fluctuation of pressure and noise.
At step 94, it is determined that the pressure (negative pressure) is increasing or there is no change, and at step 95 a = 0 is set, and
Proceed to.

At step 96, it is determined that the pressure (negative pressure) is decreasing. At step 97, a = 1 is set, and at step 83
Proceed to.

The polarity change processing routine of step 83 (see FIG. 11) performs the processing shown in FIG. In FIG. 14, in step 100, it is determined whether or not b = a. Since b is already set to "0" in step 1, when a = 0, it is determined to be yes and the process proceeds to step 101, and when a = 1, it is determined to be no and the process proceeds to step 108. Then, in step 101, it is determined that there is no polarity change, and c = 0 is set (step 102). On the other hand, in step 108, it is determined that the polarity has changed, and c = 1.
Is set (step 109).

This is because the negative pressure in the dust collection chamber 16 increases as the electric motor 14 is operated. When a = 0 indicating that the negative pressure is increasing, the polarity (the direction of the pressure change) increases. ) Determines that the polarity has not changed, and determines that the polarity has changed when a = 1 indicating that the negative pressure is falling.

In step 103, b = a is set. In other words, if a = 1, b = 1 is set, and if a = 0, b = 0 is set, and whether the previous negative pressure is rising or negative pressure is stored is stored. is there. Then, in step 104, it is determined whether or not c = 1. If yes, the process proceeds to step 110;
Go to 05. In step 110, d = 1 is set. That is, if the polarity changes, d = 1 is set.

In step 105, it is determined whether or not Vmin set in step 98 is equal to or larger than the value obtained by adding β to Vm set in step 91. If yes, the process proceeds to step 106, and if no, If there is, go to step 111. At step 106, Vmin = Vm is set.

In step 111, it is determined whether or not Vmax set in step 98 is equal to or less than the value obtained by subtracting β from Vm set in step 91. If yes, the process proceeds to step 112, and if no, If so, proceed to step 107. In step 112, Vmax = Vm is set. In step 107, it is determined whether or not m is 20 or more. If yes, the process proceeds to step 113, and if no, the process returns to the main routine. In step 113, m = 0
Is set, and the routine proceeds to step 84. That is, the process proceeds to step 84 every two seconds.

Here, when m = 1, V1 = Vmin = V
max (from steps 91 and 98)
In steps 105, 111, and 107, the determination is no, and the process returns to the main routine. Then, when the process returns to step 90, m = 2.
= V is set, and it is determined NO in step 92, and the process proceeds to step 93. In step 93, it is determined whether V1 is equal to or more than V2 + A1.

At the initial stage when the electric motor 14 is driven, the negative pressure rises, so that it is determined NO in step 93 and a = 0 is set (step 97). Then, in step 100, it is determined to be yes (since b = 0), and in step 104, it is determined to be no, and the process proceeds to step 105. Since the output voltage V increases with an increase in the negative pressure, the determination in step 105 is NO, and the process proceeds to step 111. The determination in step 111 is YES, and V2 is set as Vmax (step 112).

If the negative pressure is falling, the determination in step 105 is YES, and in step 106 V2 is set as Vmin.

That is, steps 105 to 107,11
In steps 1 to 113, Vmin is obtained every two seconds when the negative pressure is decreasing, and Vmax is obtained every two seconds when the negative pressure is increasing.

FIG. 15 shows a routine of the input process (automatic) II in step 84 (see FIG. 11). In FIG. 15, in step 120, it is determined whether or not y = 1. If yes, the process proceeds to step 121, and if no, the process proceeds to step. At step 121, y = 0 is set, and the routine proceeds to step 123.

In step 124, steps 106, 1
07 and Vmin and Vmax obtained in step 98, ΔV = Vm
ax-Vmin is determined. In step 125, it is determined whether or not d = 1. That is, it is determined whether or not the polarity has been reversed (the state of the negative pressure has changed during rising or falling). If yes, step 126
If no, go to step 127. In step 126, α which is a hysteresis component is added to ΔV, and this is reset as ΔV. That is, when the polarity is inverted, α is added to ΔV obtained in step 124 to eliminate the error due to hysteresis. Here, α is a value similar to β shown in FIG.
≒ β.

In step 127, it is determined whether or not △ V is not less than △ V1. If yes, the process proceeds to step 132, and if no, the process proceeds to step 128. If α is added to ΔV in step 126, step 12
The ΔV of 7 is ΔV obtained by adding the α. Step 1
The same applies to ΔV of 32,136.

In step 128, it is determined that the surface to be cleaned is a wooden floor, and in step 129, it is determined whether u = 1. That is, it is determined whether a wooden floor has been set. If the wooden floor processing has been performed last time, it is determined that the answer is yes, and the process proceeds to step 121;
Go to 0. In step 130, u = 1, v, w, x = 0 are set to perform the wooden floor processing, and the power supplied to the electric motor 14 is set to P.

Then, at step 131, y = 1 is set, and the routine proceeds to step 123. In step 123,
a, b, c, d = 0 are set and the process returns to the main routine.
Then, after the processing of steps 2, 13, 18, 23, 28, and 30 is performed, two seconds later, the processing returns to step 120 and y = 1
Is determined. In the previous step 131, y =
Since 1 has been set, it is determined here that the answer is yes, and the process proceeds to step 121, where y = 0 is set and step 1 is performed.
After performing the process of step 23, the process returns to the main routine.

That is, steps 120, 121, 131
Is to prevent the determination of the surface to be cleaned or the change in the power supplied to the electric motor 14 for 2 seconds.

In step 132, it is determined whether or not △ V is not less than △ V2.
If no, go to step 133. In step 133, it is determined that the surface to be cleaned is bent. In step 134, it is determined whether or not v = 1. If yes, the process proceeds to steps 121 and 123, and if no, the process proceeds to step 135. In step 135, v = 1, u, w, x = 0 are set to perform the folding process, and the power supplied to the electric motor 14 is set to P + △ P1. Then, the processing of steps 131 and 123 is performed, and the process returns to the main routine.

At step 136, it is determined whether or not △ V is not less than △ V3.
If no, go to step 137. In step 137, it is determined that the surface to be cleaned is a carpet.
In 38, it is determined whether w = 1 or not. If yes, the process proceeds to steps 121 and 123, and if no, the process proceeds to step 139. In step 139, w = 1, u, v, x = 0 are set to perform the carpet processing, and the electric motor 14
Is set to P + △ P2. Then, the processing of steps 131 and 123 is performed, and the process returns to the main routine.

In step 140, it is determined that the surface to be cleaned uses another suction port, and in step 141, x =
It is determined whether it is 1 or not.
21 and 123, and if no, the process proceeds to step 142. In step 142, x = 1, u, v, w = 0 are set in order to process the suction port body, and the power supplied to the electric motor 14 is set to P + △ P3. Then, the processing of steps 131 and 123 is performed, and the process returns to the main routine.

Here, steps 127, 132, 136
Since the magnitude of the fluctuation of the negative pressure of the dust collecting chamber 16 varies depending on the type of the surface to be cleaned, the type of the surface to be cleaned is determined from the magnitude of the fluctuation. Note that ΔV1 <ΔV2 <ΔV
3, and ΔP1 <ΔP2 <ΔP3.

When the polarity is reversed, α is added to ΔV in step 126 to reset ΔV. Therefore, the type of the surface to be cleaned is not affected by the hysteresis of the pressure sensor 17. Can be accurately determined. Therefore, the electric motor 14 can be appropriately controlled according to the type of the surface to be cleaned.

In the above embodiment, the pressure sensor 17 detects the pressure in the dust collection chamber 16. However, the pressure in the air path other than the dust collection chamber 16 (for example, the air path in the hose 13) is detected by the pressure sensor. The detection may be performed at step 17.

[0077]

As described above, according to the first aspect of the present invention, the electric motor can be properly controlled according to the clogged state of the dust collecting filter without being affected by the hysteresis of the pressure sensor. .

According to the second aspect of the present invention, the type of the surface to be cleaned can be accurately determined without being affected by the hysteresis of the pressure sensor, and the electric motor can be properly adjusted according to the type of the surface to be cleaned. Can be controlled.

According to the third aspect of the present invention, when the negative pressure in the dust collection chamber changes from an increasing state to a decreasing state, the supply power is reduced. It can be kept low and the heating of the electric motor can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vacuum cleaner.

FIG. 2 is a block diagram showing a configuration of a control system of the electric vacuum cleaner.

FIG. 3 is a flowchart showing a main routine.

FIG. 4 is a flowchart showing a hand reading process routine.

FIG. 5 is a flowchart showing an operation process.

FIG. 6 is a flowchart showing strong processing.

FIG. 7 is a flowchart showing an operation of determining the polarity of a pressure change.

FIG. 8 is a flowchart showing an operation of an input process (strong).

FIG. 9 is a flowchart showing a routine of automatic processing.

FIG. 10 is a flowchart showing an operation of an input process (automatic).

FIG. 11 is a flowchart showing a routine of automatic processing.

FIG. 12 is a flowchart showing a sampling operation.

FIG. 13 is a flowchart showing the operation of determining the polarity of pressure.

FIG. 14 is a flowchart illustrating an operation of a polarity change process.

FIG. 15 is a flowchart showing an operation of an input process (automatic).

FIG. 16 is a graph showing a relationship between an output voltage of a pressure sensor and supplied power.

FIG. 17 is a graph showing a relationship between a negative pressure of a dust collection chamber and input electric power.

FIG. 18 is a graph showing the relationship between the output voltage of the pressure sensor and the pressure of the dust collection chamber.

FIG. 19 is a graph showing the relationship between the output voltage of the pressure sensor, the pressure of the dust collection chamber, and the electric power.

FIG. 20 is an explanatory diagram showing a schematic structure of a pressure sensor.

[Explanation of symbols]

 14 Electric motor 17 Pressure sensor 35 Control unit

Claims (3)

[Claims] An air pressure is detected by a pressure sensor having hysteresis in a pressure detection characteristic, and a dust is sucked by controlling an electric motor based on an output signal corresponding to the pressure detected by the pressure sensor. An electric vacuum cleaner, wherein the value of the output signal is changed depending on whether the value of the output signal is increasing or decreasing, and the electric motor is controlled based on the output signal having the changed value. Vacuum cleaner. 2. A pressure sensor having hysteresis in pressure detection characteristics detects a pressure in an air passage, and controls an electric motor based on an output signal corresponding to the pressure detected by the pressure sensor to suck dust. An electric vacuum cleaner, wherein when the value of the output signal changes from increasing to decreasing or increasing from decreasing, a predetermined value is added to the signal value at the time of the change, and the added signal is added. An electric vacuum cleaner, wherein the electric motor is controlled based on a value. 3. The power supply to said electric motor is reduced when an output signal is output from a pressure sensor indicating that the negative pressure in said dust collection chamber has changed from a state of increasing negative pressure to a state of reducing negative pressure. The vacuum cleaner according to claim 1 or 2, wherein the vacuum cleaner is used.