JP2006075227A - Electric cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric cleaner with a simple construction capable of carrying out control of fluctuation correction of an AC power source voltage and control of an abnormal current of a powered fan 26 with a simple construction and at high speed. <P>SOLUTION: A load current flowing through a motor 5 is detected by a current detecting section 3. Further, the zero cross of the power source voltage applied to the motor 5 is detected by a zero cross detecting section. A microprocessor 7 takes in zero cross detecting signals from the zero cross detecting section and takes in a load current detected by the current detecting section in a predetermined cycle. Furthermore, load current instant values are taken in for every sampling. Additionally, load current wave crest values are obtained in a predetermined sampling number at the time of the activation of the powered fan 26. A load current set value is corrected by calculating out a compensate value from the load current wave crest value. The delay time command value determining the output timing of the trigger signal of a switching element is controlled, and the consumption power of the powered fan 26 is controlled within a predetermined range, using the compensated load current set value. The malfunction of the powered fan 26 is detected from the load current wave crest value at the time of operating the powered fan 26. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vacuum cleaner equipped with an AC drive type motor.

In a vacuum cleaner provided with an electric blower, input control of the electric blower is performed based on a current flowing through the electric blower. In general, the abnormality of the electric blower is determined by the current value.
In general, there are variations in household commercial AC power supply voltage. For example, Patent Literature 1 discloses a conventional technique for controlling a vacuum cleaner in accordance with such fluctuations in power supply voltage.
JP-A-7-313415

  However, if the control according to the fluctuation of the commercial AC power supply voltage is to be executed, a voltage detection circuit is required and the cost of parts increases. In addition, a separate voltage detection program is required, which complicates the program and increases development cost. Further, as the program amount increases, the memory capacity increases and the memory component cost increases.

  In addition, no method has been proposed for realizing the abnormality determination of the electric blower and the control according to the fluctuation of the commercial AC power supply voltage at the same time with a simple configuration at a low cost.

  Supplied with an AC drive motor connected to an AC power source via a switching element driven by a trigger signal, an electric blower comprising a fan rotated by the motor, a dust collecting section, and supplying a trigger signal to the switching element A control unit, a zero cross detection unit that detects a zero cross point of an AC voltage applied to the motor, and a current detection unit that detects a load current flowing through the motor, the control unit being detected by the current detection unit Load current instantaneous value acquisition means for sampling the load current at a predetermined sampling cycle and acquiring it as an instantaneous load current value, a calculated load current value calculated from the instantaneous load current value, a preset load current set value or a preset value The comparison result of the load current set value calculated based on the relational expression and the load for the predetermined number of sampling times Depending on the comparison result between the load current peak value obtained from the instantaneous flow value and the preset load current peak determination value, the power consumption of the electric blower is set to a preset range to the switching element. Calculated based on the preset load current set value or a preset relational expression according to the timing determining means for determining the timing of the trigger signal to be output, and the load current peak value at the start of the electric blower Setting value correcting means for correcting the load current setting value.

  According to the present invention, the load current peak value is obtained from the load current instantaneous value for the predetermined number of sampling times when the electric blower is activated. Since the load current peak value is used to perform control in accordance with fluctuations in the AC power supply voltage and abnormality determination of the electric blower, a low-cost electric vacuum cleaner can be provided with a simple configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The configuration of the electric vacuum cleaner will be described with reference to FIG. In the vacuum cleaner main body 21, a lower case 22 having an upper surface opened and an upper case 23 closing the rear upper surface of the lower case 22 are joined to each other with a bumper 24 sandwiched between peripheral edges including the front surface. And the cover body 25 which obstruct | occludes opening of a front side upper surface part is provided so that opening and closing is possible. Further, the lid 25 is formed with a notification unit 40 for notifying the user of the state of the vacuum cleaner. The notification unit 40 includes a light emitting element such as an LED, a sound generation element, and the like.

  The electric vacuum cleaner main body 21 is provided with an electric blower 26 and a dust collection bag 27 as a dust collecting portion inside, and the intake air of the electric blower 26 is passed through the dust collection bag 27 so that dust is collected in the dust collection bag 27. Is separated and collected.

  A swiveling wheel (not shown) that can turn freely is provided on the lower surface on the front side that is the traveling direction of the electric vacuum cleaner main body 21. Further, a large-diameter driven rear wheel 28 is provided on the rear side surface of the vacuum cleaner main body 21.

  A main body suction port 29 that sucks air from the outside is opened at the front center of the vacuum cleaner main body 21. Then, one end of a substantially cylindrical hose body 30 that is extendable and bendable is connected to the main body suction port 29 in communication. The other end of the hose body 30 communicates with the hand operation unit 31.

  The hand operation unit 31 is provided with an operation button 32 for selecting the operation mode of the electric blower 26 including “OFF”, and a gripping unit 33 that is held by an operator when cleaning. An extension pipe 34 is detachably communicated with the distal end of the hand operation section 31, and the extension pipe 34 and the hose body 30 communicate with each other via the hand operation section 31. The extension pipe 34 includes a large diameter pipe 34a and a small diameter pipe 34b inserted into the large diameter pipe 34a, and the entire extension pipe can be expanded and contracted by sliding the small diameter pipe 34b with respect to the large diameter pipe 34a. A floor brush member 35 provided with a suction port for sucking dust on the surface to be cleaned is detachably attached to the tip of the extension pipe 34.

  A circuit board 101 on which a control unit 10 that controls the vacuum cleaner is mounted is incorporated in the main body 21 of the vacuum cleaner. Here, the vacuum cleaner control device 100 including the control unit 10 will be described with reference to FIG. A commercial AC power supply 1 is connected in series to a switching element driven by a trigger signal, for example, a bidirectional three-terminal thyristor (hereinafter referred to as “three-terminal thyristor”) 2, a current fuse 4, and an AC-driven motor 5. ing.

  The electric blower 26 mainly includes a motor 5 and a fan 13. The motor 5 is a universal motor including an armature 5a having a commutator and field windings 5b and 5c. The fan 13 is a centrifugal fan connected to the rotating shaft of the motor 5. The current detection unit 3 includes, for example, a current transformer or a shunt resistor, and detects a load current flowing through the motor 5. The zero cross point of the AC voltage applied to the motor 5 is detected by the zero cross detector 6.

  The control unit 10 includes a microprocessor 7, a memory 8, and an I / O port 9 having an A / D conversion function. The memory 8 stores in advance data such as a control program executed by the microprocessor 7 and necessary constants. The memory 8 is provided with a data storage area and a work area for temporarily storing data from the microprocessor 7. The detected current detected by the current detector 3 is full-wave rectified by the full-wave rectifier 11 and then input to the I / O port 9. The I / O port 9 takes in the detection current subjected to full-wave rectification by digital conversion. Further, the zero cross detection unit 6 inputs the detected zero cross detection signal to the I / O port 9.

  Further, an A / D reference voltage source 12 and an operation unit 13 are provided, and an A / D reference voltage is input from the A / D reference voltage source 12 to the I / O port 9 and an instruction signal from the hand operation unit 31 is provided Is input to the I / O port 9.

  The control unit 10 captures a load current, a zero-cross signal, a reference voltage value, and an instruction signal, and outputs a trigger signal to the gate terminal of the three-terminal thyristor 2. .

  In this vacuum cleaner control device 100, a power supply voltage having a waveform shown in FIG. 3A is applied from the commercial AC power supply 1, and the control unit 10 applies the gate terminal of the three-terminal thyristor 2 to the gate terminal of FIG. When the trigger signal is supplied at the timing shown in FIG. 3, the three-terminal thyristor 2 is turned on until the power supply voltage is inverted by the trigger signal, so that the voltage shown in FIG.

  At this time, a zero-cross detection signal shown in FIG. 3B is input from the zero-cross detection unit 6 to the I / O port 9 of the control unit 10. Also, the load current detection waveform detected by the current detection unit 3 and full-wave rectified by the full-wave rectifier 11 and the maximum load current value between the zero cross points of the power supply voltage are as shown in FIG. If the period of the power supply voltage is Tv (sec) and the time from the zero cross point of the power supply voltage to the output of the trigger signal is t (sec), the conduction angle φ (%) of the three-terminal thyristor 2 is φ = {( Tv / 2) −t} / (Tv / 2) × 100. Hereinafter, the time t (sec) from the zero cross point of the power supply voltage until the trigger signal is output is referred to as a delay time.

  Furthermore, the load current peak value between the zero cross points of the power supply voltage after the electric blower 26 is started under the same power supply voltage condition is as shown in FIG. 4 according to the clogging state of the dust bag 27. Change. That is, the difference between the load current peak value when the dust bag 27 is clogged and the load current peak value when the dust bag 27 is not clogged is almost zero immediately after the electric blower 26 starts to start. Yes, but gradually increases over time. Therefore, the load current peak value immediately after the electric blower 26 starts to start is hardly affected by the clogging of the dust collecting chamber and depends on the power supply voltage. Further, since the motor 5 is an AC drive type, the load current peak value Iz can be regarded as equivalent to the instantaneous maximum load current value.

  Here, each function which the control part 10 has is demonstrated using FIG. The control unit 10 mainly includes a load current instantaneous value capturing unit 51, a peak value determining unit 52, a calculation value calculating unit 53, a timing determining unit 54, a load current peak value determining unit 55, and a current set value correcting unit 56. .

  The load current instantaneous value capturing unit 51 acquires the load current instantaneous value in detected from the current detection unit 3 at a predetermined sampling period, and the load current instantaneous value in is supplied to the peak value determining unit 52 and the calculation value calculating unit 53. hand over. The crest value determining unit 52 compares the load current instantaneous values (i1, i2,..., In) sampled a predetermined number of times, and obtains the load current crest value Iz therefrom. Then, this load current peak value Iz is passed to the load current peak value determining unit 55 and the current set value correcting unit 56. The calculation value calculation unit 53 calculates the load current calculation value Is by adding the load current instantaneous value in by a predetermined number of sampling times, and passes this load current calculation value Is to the timing determination unit 54. The timing determination unit 54 compares the load current calculation value Is with preset load current set values Ig1 to Ig4, calculates a delay time command value ts from the comparison result, and triggers according to the command value ts. Output a signal. Alternatively, the load current calculation value Is and the preset load current set values Ig1 to Ig4 are compared, and a signal is output to the notification unit 40 according to the comparison result. The load current peak value discriminating unit 55 compares the load current peak value Iz with a preset current peak value discriminating value Ip to determine an error, and issues an instruction to the timing determining unit 54 according to the error. The current set value correction unit 56 corrects the load current set values Ig1 to Ig4 according to the load current peak value Iz * within a predetermined time after the electric blower 26 is started, and the corrected load current The set value Ig * is passed to the timing determination unit 54. Specific functions of the load current peak value determination unit 55 and the load current set value correction unit 56 will be described later.

  Next, the data tables 16 and 17 set in the memory 8 of the control unit 10 will be described. A data table 16 shown in FIG. 6 is an example of a data table showing the relationship between the delay time command value ts and the load current set values Ig1 to Ig4. A data table 17 shown in FIG. 7 is an example of a data table showing correction values for correcting the load current set value Ig in accordance with the load current peak value Iz * at the time of startup.

  First, each value of the data table 16 will be described. In the data table 16, n + 1 set values U0, U1, U2,..., Un (where Un <... <U2 <U1 <U0) are set as delay time command values ts which are trigger signal output timings. As the lower limit load current set value Ig1 according to the delay time command value ts, n set values X1, X2, X3,..., Xn (where Xn>...> X3> X2> X1 Similarly, n set values Y1, Y2, Y3,..., Yn (Yn>...> Y3> Y2> Y1) are set as the upper limit load current set value Ig2. . As shown in FIG. 8, the magnitude relation between these load current set values Ig1 and Ig2 is X1 <X2 <Y1 <X3 <Y2 <X4 <Y3 <X5 <Y4 <..., Xn <Yn-1 <Yn. ing. Further, a set value Za is set as the clogging notification load current set value Ig3, and a set value Zb is set as the input decrease load current set value Ig4. The magnitude relationship between these load current set values Ig3 and Ig4 is Zb <Za as shown in FIG. The values in these data tables 16 serve as reference load current setting values when the AC power supply voltage is 100V.

  The vacuum cleaner control device 100 (see FIG. 2) drives the electric blower 26 by outputting a trigger signal from the control unit 10 to the three-terminal thyristor 2. Then, in a state where no dust is collected in the dust bag 27, the control unit 10 sets the delay time command value ts to U0 so that the amount of intake air corresponding to the power consumption of the electric blower 26 is equal to or greater than Q0. Set. At this time, for example, the operating point of the electric blower 26 is point A in FIG.

  In this state, the electric blower 26 is driven to start cleaning, whereby dust is collected in the dust bag 27. As dust collection progresses, the air path resistance of the dust collection bag 27 increases, and the intake air volume of the electric blower 26 decreases. Along with this, the load current calculation value Is gradually decreases from the point A toward the set value X1 of the lower limit load current set value Ig1.

  When the load current correction total value Is becomes equal to or less than the set value X1 of the lower limit load current set value Ig1, the delay time command value ts for determining the timing for outputting the trigger signal is changed from U0 to U1, and the three-terminal thyristor 2 is changed. Is increased, and the intake air volume of the electric blower 26 is increased. At this time, the load current calculation value Is becomes Y1, and the power consumption of the electric blower 26 increases.

  Thereafter, as dust collection progresses, the dust bag 27 air path resistance further increases, and the intake air volume of the electric blower 26 decreases. As a result, the load current calculation value Is gradually decreases toward the set value X2 of the lower limit load current set value Ig1.

  When the load current calculation value Is becomes equal to or lower than the set value X2 of the lower limit load current set value Ig1, the delay time command value ts that determines the timing for outputting the trigger signal is changed from U1 to U2, and the three-terminal thyristor 2 is changed. The conduction angle is further increased, and the intake air volume of the electric blower 26 is increased. At this time, the load current calculation value Is becomes Y2, and the power consumption of the electric blower 26 increases.

  Thus, as the dust collection into the dust collection bag 27 progresses, the load current calculation value Is becomes less than the set values X1, X2, X3, X4,... Of the lower limit load current set value Ig1, respectively. The command value ts is changed to U0, U1, U2, U3,. After that, after the load current calculation value Is becomes equal to or lower than the set value Xn of the lower limit load current set value Ig1 and the delay time command value ts is set to Un, the delay time command is reduced even if the load current calculation value Is decreases. The value ts is not changed.

  Further, in this state, when the dust collection to the dust collection bag 27 proceeds and the load current calculation value Is becomes clogged and falls below the set value Za of the notification current set value Ig3, the control unit 10 fills the dust in the dust collection bag 27. It judges that it is near, outputs a signal to the notification unit 40, and prompts the user to replace the dust bag 27. Further, in this state, the dust collection bag is not replaced, and dust collection to the dust collection bag 27 proceeds, and when the load current calculation value Is falls below the set value Zb of the input decrease current set value Ig4, the control unit 10 26, it is determined that the normal operation is difficult, and the input of the electric blower 26 is forcibly decreased.

  Next, each value in the data table 17 will be described. In the data table 17, set values K1, K2, K3,..., K6 (where K6 <... <K3 <K2 <K1) are set as the load current peak values Iz * at the time of startup. Setting values 0, α1, α2,..., Α5 (where α5>...> Α2> α1> 0) are set as the load current setting subtraction correction value α corresponding to the load current peak value Iz *. Yes.

  The load current set value correction unit 56 corrects the load current set values Ig1 to Ig4 in the data table 16 using the data table 17. The load current set value correction unit 56 may correct all the load current set values Ig1 to Ig4. However, according to the specification of the vacuum cleaner, for example, the clogging notification load current set value Ig3 and the input decrease load current Of course, only the set value Ig4 may be corrected.

  Next, a method for correcting the clogging notification load current set value Ig3 and the input decreased load current set value Ig4 will be described in detail. First, when the electric blower 26 is activated, the load current peak value Iz * is extracted from the load current instantaneous value in sampled a predetermined number of times. Then, the correction value α is obtained from the load current peak value Iz * and the data table 17. For example, if the load current peak value Iz * at startup is K3 ≦ Iz * <K4, the load current set value correction unit 56 determines that the power supply voltage is 92 [V], and adopts α2 as the correction value. To do. Next, from the correction value α2 and the data table 16, the clogging notification load current set value Ig3 = Za−α2 and the input decrease load current set value Ig4 = Zb−α2 are set. That is, when the power supply voltage is lower than the reference value 100V, correction is made so that each load current set value is also lowered according to the difference. The timing determination unit 54 controls the switching element 2 and the notification unit 40 based on each corrected load current set value Ig *.

  Next, the load current peak value determination unit 55 will be described. The load current peak value determination unit 55 compares the load current peak value Iz with a load current peak value determination value Ip set in advance in the memory 8 when the electric blower 26 is in operation. As the load current wave height discrimination value Ip, for example, a caution load current set value β1 and an abnormal load current set value β2 (β2> β1) are set. Then, the load current peak value determination unit 55 sends a signal for forcibly reducing the input of the electric blower 26 to the timing determination unit 54 when Iz> β1. At this time, the input power of the electric blower 26 is in a predetermined range. When Iz> β2, a signal for forcibly stopping the operation of the electric blower 26 is sent to the timing determination unit 54. At this time, the input power of the electric blower 26 becomes zero.

  Next, each control routine will be described. The control unit 10 performs the processing of the main routine shown in FIG. 9 according to a control program stored in advance in the memory 8. In this main routine, first, various initial settings of the vacuum cleaner are performed in step S1. Then, when it is determined in step S2 that the user takes in the instruction signal from the operation unit 31, the load current set values Ig1 to Ig4 shown in FIG. 6 are set in step S3. In step S4, for example, the delay time command value ts is set to 2 Tv / 5, and the delay time initial setting value is set to tf. At this time, the conduction angle φ is φ = {(Tv / 2) − (2Tv / 5)} / (Tv / 2) × 100 = 20%. Note that (2Tv / 5)> tf.

  Then, until the command value ts reaches the initial set value tf, the determination in step S5 and the subtraction of the predetermined value ta to the command value ts in step S6 are repeated, and a soft start that gradually increases the input power to the motor 5 is executed. To do. If it is determined in step S5 that the command value ts has reached the initial set value tf, the process proceeds to step S7 to enter the main loop.

  While the main loop processing is being executed, the control unit 10 periodically executes a current detection routine shown in FIG. 10 using a timer (not shown) or the like. First, in step S11, the current detection routine execution count is counted. That is, executing the current detection routine is executing current sampling, and the timer sets the current sampling period. For example, if the current sampling period is set to 0.2 msec under a 50 Hz AC power supply, the current is sampled 100 times during one period (20 msec) of the power supply voltage. Accordingly, counting the current detection routine execution count 100 times ends one cycle of the power supply voltage.

  Subsequently, in step S <b> 12, the load current instantaneous value capturing unit 51 captures the load current instantaneous value in from the I / O port 9. In step S13, the peak value determination unit 52 determines the load current peak value Iz from 100 instantaneous load current values in, assuming that the AC power supply of 50 Hz and the current sampling period are 0.2 msec. If the captured load current instantaneous value in is the maximum, the load current peak value Iz is changed in step S16. Here, the load current peak value Iz is the maximum value of the load current instantaneous value within a predetermined number of times of sampling, but the function of the average value of a plurality of load current instantaneous values before and after is set as the load current peak value Iz. Fulfill. Alternatively, the load current peak value Iz can be obtained by averaging a plurality of load current peak values.

  Further, in step S14 and step S18, the load current peak value Iz and the load current peak determination value Ip on the memory 8 are sequentially compared. In step S14, if Iz> β1, in step S17, the load current peak value determination unit 55 sends a command value ts for decreasing the input of the electric blower 26 to the timing determination unit 54. In step S18, if Iz> β2, the load current peak value determination unit 55 sends a command to stop the operation of the electric blower 26 to the timing determination unit 54 in step S19.

  Subsequently, in step S15, the load current calculated value Is is calculated by sequentially adding the load current instantaneous values in obtained so far. And it returns to step S7 which performs a main loop. This Is = Σ (in) calculation is repeated a predetermined number of times for each sampling period. For example, when a 50 Hz AC power supply, a current sampling period Ti = 0.2 msec, and a Σ calculation period are set to a half period of the power supply voltage, 50 times of in from the zero cross point to the next zero cross point are added (20 msec / 2 /0.2 msec = 50). Alternatively, for example, when the cycle of Σ calculation is set to one cycle of the power supply voltage, in for 100 times from the zero cross point to the second zero cross point is added.

  Further, the calculation of the instantaneous load current value is not limited to the above Is = Σ (in), but in order to correct the phase difference between the voltage and the current, the instantaneous value of the load current is calculated as Is = Σ (Ci × in). You may add sequentially what multiplied the coefficient. The coefficient Ci is a value that changes according to the characteristics of the electric blower 55 or the current detection timing.

  Further, when the control unit 10 detects the zero cross point by the zero cross detection signal from the zero cross detection unit 6 in the state where the main loop processing is being executed, the control unit 10 executes a zero cross routine shown in FIG. In this zero-cross routine, the timing determination unit 54 determines the delay time command value ts that determines the output timing of the trigger signal to the switching element 2, and further instructs the notification unit 40.

  Next, a specific example of a method for determining the delay time command value ts and a method for instructing the notification unit 40 will be described. Here, first, a zero cross routine for the control unit 10 to control such an electric blower 26 will be described with reference to FIG. In this zero cross routine, first, in step S51, it is determined whether or not the time range is in the time range tj (sec) used for correcting the load current set value immediately after the start-up shown in FIG. If this zero cross is within the time range tj (sec), the load current set value correction unit 56 determines the correction value α from the load current peak value Iz * and the data table 17 in step S52. When the time range tj (sec) is passed, in step S53, the timing determination unit 54 checks the command value ts for the current delay time.

  Next, in step S54, it is determined whether or not the command value ts is the shortest, that is, ts = Un shown in FIG. If the command value ts is not the shortest, the lower limit load current set value Ig1 corresponding to the command value ts is acquired in step S55. In step S56, the lower limit load current set value Ig1 and the load current calculation value Is are compared. If Is−Ig1> 0, the control unit 10 uses the power consumption set by the electric blower 26 at the command value ts. Judge that it is operating in the range. In step S58, the execution counter of the current detection routine is cleared. In step S59, the load current peak value Iz is cleared. In step S60, the load current calculation value Is is cleared. In step S61, the delay timer is set. After clearing and restarting, the process returns to the main loop of step S7.

  Alternatively, if Is-Ig1 ≦ 0 in step S56, the control unit 10 determines that the power consumption of the electric blower 26 is lower than the set power consumption range, and in step S57, the delay time is determined. The command value ts is shortened by one step, the conduction angle of the three-terminal thyristor 2 is increased, and the input power to the electric blower 26 is increased. For example, if the command value is U0, it is set to U1. Similarly, the current detection routine execution number counter is cleared in step S58, the load current peak value Iz is cleared in step S59, the load current calculation value Is is cleared in step S60, and in step S61. After the delay timer is cleared and restarted, the process returns to the main loop in step S7.

  Alternatively, if the command value ts is the shortest in step S54, the load current calculation value Is is compared with the corrected clogging notification load current set value Ig * 3 (= Za−α) in step S62. . If Is ≧ Za−α, the process proceeds to step S58.

  Alternatively, if Is <Za−α in step S62, then in step S63, the load current calculation value Is is compared with the corrected input decrease load current set value Ig * 4 (= Zb−α). . If Is ≧ Zb−α, the LED as the notification unit 40 blinks in step S64. Then, the process proceeds to step S58.

  Alternatively, if Is <Zb−α in step S63, ts for decreasing the input is set in step S65. Then, the process proceeds to step S58.

  Finally, the timing determining means 54 starts measuring the delay time from the zero cross point by the delay timer (not shown) cleared in step S61, and periodically executes the trigger signal output routine shown in FIG. That is, in step S31, it is checked whether the count time of the delay timer has reached the delay time command value ts. If not, the process returns to step S7. When the count time of the delay timer reaches the delay time command value ts, a trigger signal is output from the I / O port 9 to the three-terminal thyristor 2 in step S32. Then, the process returns to step S7.

  Thus, the delay time command value ts is determined by the comparison result between the lower limit load current set value Ig1 and the load current calculation value Is. That is, the control unit 10 compares the preset lower limit load current set value Ig1 with the calculated load current calculated value Is, changes the delay time command value ts based on the comparison result, and consumes the electric blower 26. The power is controlled to be in a preset range. In this case, the lower limit load current set value Ig1 changes according to the intake air volume of the electric blower 26, and accordingly, the preset power consumption range also changes. Therefore, since the delay time command value ts and the lower limit load current setting value Ig1 are changed according to the amount of dust in the dust bag 27, the power consumption of the electric blower 26 is controlled within a preset appropriate range. The suction performance as an electric vacuum cleaner can be maintained.

  As described above, the vacuum cleaner control device 100 according to the present embodiment obtains the correction value α from the load current peak value Iz * in the predetermined time range tf immediately after the electric blower 26 is started. Then, the corrected load current setting values Ig * 1 to Ig * 4 are obtained from the reference load current setting values Ig1 to Ig4 and the correction value α. Then, the load current set values Ig * 1 to Ig * 4 are compared with the calculated load current calculation value Is, and the notification unit 40 is controlled based on the comparison result, or the delay time command value ts is changed. The switching element 2 is controlled. This load current peak value Iz * is almost independent of the amount of dust accumulated in the dust bag 27, and changes according to the AC power supply voltage. Therefore, the corrected current set values Ig * 1 to Ig * 4 are the load current set values in consideration of the AC power supply voltage. By such correction of the load current set value, input control of the electric blower 26 and control of the notification unit 40 can be performed according to fluctuations in the AC power supply voltage. Therefore, even when the power supply voltage is lower than the reference value, the control unit 10 does not advance the timing of the clogging notification or the forced input reduction control of the electric blower 26.

  Further, during the operation of the vacuum cleaner, the control unit 10 compares the load current peak value Iz with a preset load current peak determination value Ip to determine whether the motor 2 is abnormal. Since this load current peak value is not an average value of the load current but an instantaneous maximum load current value, the abnormality of the motor 2 can be predicted in more detail.

  Further, since the load current set value is corrected and the abnormal current is discriminated from the same load current peak value Iz, no new program is added. Therefore, the program configuration is not complicated and can be realized at low cost.

  Furthermore, in general, the A / D conversion process requires more time than the arithmetic processing in the microprocessor 7, but the vacuum cleaner control device 100 according to the present embodiment performs A / D conversion of only the load current value. Since only the processing is performed, and the load current peak value Iz obtained from the A / D conversion processing is used, the processing can be performed at high speed.

  Moreover, in the vacuum cleaner control device 100 of the present embodiment, a special physical quantity detection means of the motor 5 is not required in addition to the zero cross detection unit 6 and the current detection unit 3, and thus the configuration of the vacuum cleaner control device is configured. It can be simplified.

  The data table 17 described above shows the relationship between the load current peak value Iz * and the correction value α at the time of start-up, but the data table 17 is not limited to this format, and the load current peak value Iz *. And the corrected load current set value Ig * may be directly defined.

  The correction of the current setting value described above is an embodiment for the clogging notification current setting value Ig3 and the input decrease current setting value Ig4. However, the correction of the current setting value is not limited to this method. A correction may be made to the lower limit load current set value Ig1 or the upper limit load current set value Ig2.

  In this embodiment, the timing determination unit 54 calculates the delay time command value at that time from the n set values X1, X2, X3,..., Xn of the lower limit load current set value Ig1 shown in the data table 16. The lower limit load current set value Ig1 was obtained according to ts. In this embodiment, the present invention is not limited to this data table method. If the timing determining unit 54 sets the first stage setting value of the lower limit load current setting value Ig1 to X1, the n stage setting value Xn is The trigger signal may be output by an arithmetic expression such as Xn = X1 + ζ × (n−1) × ts.

  Further, the delay time command value ts interval Un−U (n−1) = ΔUn, the lower limit load current set value Ig1 interval Xn−X (n−1) = ΔXn, and the upper limit load current set value Ig2 interval Yn. −Y (n−1) = ΔYn does not have to be a constant interval, and may be set according to the use of the vacuum cleaner or the characteristics of the electric blower 26.

  Further, the load current instantaneous value capturing unit 51, the peak value determining unit 52, the calculation value calculating unit 53, the timing determining unit 54, the load current peak value determining unit 55, and the load current set value correcting unit 56 of the control unit 10 are performed. The processing is not limited to the case where it is executed by software installed in the memory 8, and the function formed by the software may be provided as hardware and executed.

  In the embodiment described above, the control is based on the assumption that the amount of dust in the dust bag 27 increases, the resistance of the air passage increases, and the calculated load current calculation value Is decreases. On the contrary, when the user is using the vacuum cleaner, the air path resistance is reduced due to the positional relationship between the floor brush member 35 and the cleaning surface and the bend angle of the hose body 30, and the suction air volume is rapidly increased. There is a case. Therefore, assuming such a use situation, an upper limit load current set value Ig2 different from the lower limit load current set value Ig1 as shown in FIGS. 6 and 8 is required.

  That is, for example, when the operating point of the electric blower 26 is at B and the load current calculation value Is is equal to or greater than the set value Y3 of the upper limit load current set value Ig2, the delay time command value ts that determines the timing for outputting the trigger signal. Is increased from U3 to U2, the conduction angle of the three-terminal thyristor 2 is reduced, and the intake air volume of the electric blower 26 is reduced. At this time, the load current calculation value Is becomes X3, and the power consumption of the electric blower 26 decreases.

  This control method will be described with reference to FIG. This routine is a zero cross routine, and steps S70 and S71 are added to the routine shown in FIG. In step S70, if Is−Ig2 ≧ 0, the delay time command value ts is increased by one step in step S71. For example, if the command value is U3, it is set to U2. Thus, the load current calculation value Is is calculated, and the delay time command value ts and the upper limit and lower limit load current set values Ig1, Ig2 are changed according to the amount of dust in the dust bag 27, and the electric blower 26 The power consumption is controlled within an appropriate range set in advance.

  In addition, the control unit 10 described above periodically executes a current detection routine in a period from the detection of the zero cross point of the power supply voltage to the output of the trigger signal to the three-terminal thyristor 2, and the instantaneous value of the load current. was getting in. However, the execution of the load current detection routine during this period may be stopped. That is, since no electric power is supplied to the motor 5 during this period, the load current is originally zero. However, actually, the load current instantaneous value in does not become zero due to noise or the like, and therefore the load current calculation value Is during this period may not become zero. Therefore, if the control unit 10 stops the execution of the current detection routine in this period, the load current calculation value Is in this period is not calculated, so that an error due to noise or the like can be reliably reduced to zero.

  FIG. 14 is a flowchart showing a load current detection routine for realizing this control. First, in step S41, the load current detection routine execution count is counted. Subsequently, in step S42, whether or not the elapsed time obtained by multiplying the count of the number of executions by the detection period of the load current instantaneous value in, that is, the sampling period, is smaller than the delay time command value ts. Judging. If the elapsed time is smaller than the delay time command value ts, the process returns to step S7.

  When the elapsed time reaches the delay time command value ts, the load current instantaneous value in is taken from the I / O port 9 in S43. Subsequently, it is determined whether or not the load current instantaneous value taken in step S44 is maximum. If the captured instantaneous load current value is the maximum, the load current peak value Iz is changed in step S46. Thereafter, in step S45, Σ (in) is calculated from the load current instantaneous value in obtained up to that point, and the load current calculation value Is is calculated. Then, the process returns to step S7.

  By executing such a load current detection routine, the load current peak value determined from the sampled load current instantaneous value in during the period from when the trigger signal is output until the next zero cross point of the power supply voltage is detected. A load current calculation value Is obtained by adding Iz and the sampled load current instantaneous value in is obtained.

  Further, the determination in S42 is not necessarily performed at this timing, it is determined whether or not the load current instantaneous value captured in step S44 is the maximum among the predetermined number of samplings, and the load current calculation value Is in step S45 is calculated. The timing may be executed at any timing as long as it is before the timing. In particular, since the A / D conversion process takes more time than the arithmetic processing in the microprocessor 7, it is more preferable to make the determination in step S42 before step S43 in which the A / D conversion process is performed.

  This control can improve the accuracy of the load current calculation value Is calculated in half-cycle units between the zero cross points of the power supply voltage, and as a result, variations in power consumption of the electric blower 5 are reduced. Furthermore, the processing load on the microprocessor 7 can be reduced, and the capacity of the microprocessor 7 can be applied to other controls accordingly.

  In the embodiment described above, the waveform detected by the current detector 3 is full-wave rectified by the full-wave rectifier 11, and the full-wave rectified load current detection waveform shown in FIG. The load current calculation value Is is calculated by sampling at a predetermined sampling cycle every half cycle of the voltage. However, the present invention is not limited to this, and by performing half-wave rectification using a diode instead of the full-wave rectifier 11, a load current detection waveform indicated by a dotted waveform in FIG. The load current calculation value Is and the load current peak value Iz may be calculated by sampling at a predetermined sampling cycle every half cycle of the power supply voltage using the current detection waveform. Even if the load current calculation value Is and the load current peak value Iz are calculated every half cycle of the power supply voltage using the load current detection waveform obtained by such a half-wave rectification, there is no effect in the present embodiment. The inventor has confirmed that there is no problem.

  Also, the load current calculation value Is and the load current peak value Iz can be calculated every half cycle of the power supply voltage by a program process without using a circuit element such as a diode and using a full-wave rectifier. Good. In order to realize this, when the load current calculation value Is and the load current peak value Iz in the half cycle of the power supply voltage are calculated in the current detection routine, the load current calculation value Is and the load current wave are calculated in the next half cycle. What is necessary is just to set it as the process which returns, without calculating the high value Iz.

  In this way, by performing the process of calculating the load current calculation value Is and the load current peak value Iz every half cycle of the power supply voltage, the execution load of the microprocessor 7 can be reduced, and the capacity of the microprocessor 7 can be reduced accordingly. Can be used for other controls.

The perspective view which shows the structure of the vacuum cleaner which concerns on embodiment of this invention. The figure which shows the circuit structure of the motor control apparatus which concerns on embodiment of this invention. The figure which shows the voltage of each part in the same embodiment, an electric current, and a signal waveform. The figure which shows the relationship between the time at the time of starting of the electric blower of the vacuum cleaner of the embodiment, and load current peak value. The figure explaining the functional block of the control part of the embodiment. The figure which shows the structure of the electric current setting value data table used in the embodiment. The figure which shows the structure of the correction | amendment data table used in the embodiment. The graph which showed the change of the delay time command value and the current setting value as a parameter about the relationship between the intake air volume of the electric blower and the load current calculation value when the vacuum cleaner of the embodiment is driven. 6 is a flowchart showing a main routine executed by the microprocessor of the embodiment. 6 is a flowchart showing a current detection routine executed by the microprocessor of the embodiment. 6 is a flowchart showing a zero cross routine executed by the microprocessor of the embodiment; 6 is a flowchart showing a trigger signal output routine executed by the microprocessor of the embodiment. 6 is a flowchart showing a zero cross routine executed by the microprocessor of the embodiment; 6 is a flowchart showing a current detection routine executed by the microprocessor of the embodiment.

Explanation of symbols

2 Bidirectional 3-terminal thyristor 3 Current detection unit 5 AC drive type motor 6 Zero cross detection unit 7 Microprocessor 8 Memory 10 Control unit 17 Correction data table

Claims (10)

Supplied with an AC drive motor connected to an AC power source via a switching element driven by a trigger signal, an electric blower comprising a fan rotated by the motor, a dust collecting section, and supplying a trigger signal to the switching element A control unit, a zero cross detection unit that detects a zero cross point of an AC voltage applied to the motor, and a current detection unit that detects a load current flowing through the motor,
The controller is
Load current instantaneous value capturing means for sampling the load current detected by the current detection unit at a predetermined sampling period and capturing it as an instantaneous load current value;
A comparison result between the load current calculation value calculated from the load current instantaneous value and a preset load current set value or a load current set value calculated based on a preset relational expression, and the load current for a predetermined number of sampling times Depending on the comparison result between the load current peak value obtained from the instantaneous value and a preset load current peak determination value, the power consumption of the electric blower is set to a preset range to the switching element. Timing determining means for determining the timing of the output trigger signal;
A set value correction means for correcting the load current set value calculated based on the preset load current set value or a preset relational expression according to the load current peak value at the time of starting the electric blower;
A vacuum cleaner characterized by comprising: Supplied with an AC drive motor connected to an AC power source via a switching element driven by a trigger signal, an electric blower comprising a fan rotated by the motor, a dust collecting section, and supplying a trigger signal to the switching element A control unit that notifies the amount of dust in the dust collection unit, a zero cross detection unit that detects a zero cross point of an AC voltage applied to the motor, and a current detection unit that detects a load current flowing through the motor. Prepared,
The controller is
Load current instantaneous value capturing means for sampling the load current detected by the current detection unit at a predetermined sampling period and capturing it as an instantaneous load current value;
The load current calculation value calculated from the load current instantaneous value is compared with a preset load current set value or a load current set value calculated based on a preset relational expression, and the notification is made according to the comparison result. The timing of the signal to the unit is determined, and according to the comparison result between the load current wave height value obtained from the load current instantaneous value for a predetermined number of sampling times and a preset load current wave height discrimination value, Timing determining means for determining the timing of the trigger signal output to the switching element so that the power consumption is in a preset range;
A set value correction means for correcting the load current set value calculated based on the preset load current set value or a preset relational expression according to the load current peak value at the time of starting the electric blower;
A vacuum cleaner characterized by comprising:   3. The electric vacuum cleaner according to claim 1, wherein the control unit includes a calculation value calculation unit that calculates the load current calculation value by adding the load current instantaneous value by a predetermined number of sampling times.   The electric vacuum cleaner according to claim 3, wherein the calculated value calculating means calculates the load current calculated value after outputting a trigger signal from the control unit to the switching element.   The vacuum cleaner according to claim 1 or 2, wherein the set value correction means calculates the load current peak value after outputting a trigger signal from the control unit to the switching element.   4. The electric vacuum cleaner according to claim 3, wherein the calculation value calculation means calculates the load current calculation value in units of at least a half cycle of the AC voltage applied to the motor.   4. The timing determination unit according to claim 3, wherein the timing determination unit advances the timing of a trigger signal output from the control unit to the switching element when the load current calculation value is smaller than the load current set value. 5. Electric vacuum cleaner.   The electric vacuum cleaner according to claim 1 or 2, wherein the load current set value is set in advance corresponding to each timing of a trigger signal output from the control unit.   The control unit includes a plurality of the load current set values, and the timing determination unit changes the load current set values in accordance with a change in timing of a trigger signal output from the control unit to the switching element. The electric vacuum cleaner according to claim 1 or 2.   2. The timing determining means delays the timing of a trigger signal output from the control unit to the switching element when the load current peak value becomes larger than the load current peak determination value. Or the vacuum cleaner of 2.

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