CN2246163Y - Dress amount testing device for washing machine - Google Patents
Dress amount testing device for washing machine Download PDFInfo
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- CN2246163Y CN2246163Y CN 94247477 CN94247477U CN2246163Y CN 2246163 Y CN2246163 Y CN 2246163Y CN 94247477 CN94247477 CN 94247477 CN 94247477 U CN94247477 U CN 94247477U CN 2246163 Y CN2246163 Y CN 2246163Y
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Abstract
The utility model relates to a dress amount detecting device for a washing machine, belonging to the technical field of washing machines. The utility model comprises a motor of a washing machine, a single chip computer, a drive circuit, a sensing circuit which can obtain the counter electromotive force of washed dress amount from a stator tap of the washing machine, a shaping and amplifying circuit, a memory circuit and/or a voltage detecting circuit. The utility model has simple structure and is suitable for batch production. When the mechanical parameters of the motor of the washing machine is inconsistent, the utility model can be corrected; when the voltage of a network fluctuates, the utility model can be compensated in order to guarantee the detection accuracy of the information of dress amount.
Description
The utility model is a kind of clothes quantity detecting device that is used for washing machine, relates to the improvement of automatic washing machine clothes quantity detecting device.This device also can be revised the standard that laundry amounts is discerned automatically except that can discerning automatically the amount of laundry item.
The fabric quantity sensor of protection among the patent of invention of Hitachi Co., Ltd---the CN85107630A " automatic washing machine ".
As shown in Figure 1, said fabric quantity sensor 10 links to each other with said agitating device 14, and is cut off the fabric amount that detects article to be washed the die-away time of moving behind the power supply according to said agitating device.
Said agitating device comprises a motor, and said fabric quantity sensor rotates the peak value number of the electromotive force waveform that induces and measures said interior die-away time when said motor is cut off power supply by the inertia of counting Yin Mada.
Wherein the on-state of said motor and off-state are periodically repeated repeatedly, and the method that said fabric quantity sensor is always added up by the peak value of induction voltage waveform that institute's number in the repeatedly off-state of said inner motor is gone out is measured said die-away time.
Wherein, before injecting washing agent and afterwards, use the fabric amount of twice said article to be washed of detection of fabric quantity sensor.
The fabric quantity sensor 10 (seeing Fig. 1 and Fig. 2) of the fabric amount that is used to judge the article that washing will be described now.As shown in Figure 2, the sleeve 64 that has magnet 63 is fixed in the rotating shaft 10b that stretches out from motor 14.The shell 60 that has a pole piece 60a and a bobbin 66 is fixed on the shell of motor 14 by means of screw 65 with its flange 60b.Pole piece 60a faces magnet 63, and coil 61 is on bobbin 66.The lead-in wire of coil 61 is 62.When stirring, motor 14 is powered off and on to form 0.3 second to 0.1 second on-state and 0.3 second to 0.2 second off-state.This on/off state is repeated periodically with rotating shaft 10b.Magnet 63 and pole piece 60a induce electromotive force.Because the inertia of rotation, after motor 14 be off-state, rotating shaft continued rotation, thereby the electromotive force of responding to must be as the waveform as indicated in Fig. 3.Supposition now, the off-state of motor occurs in a point, and the rotation of rotating shaft 10b is slack-off, up to the b point, has produced the voltage waveform of peak value above threshold values Vth (for example 0.4 volt).Therefore, by a time interval, in other words an a and b order with Th die-away time judge that the fabric amount that drops into the article to be washed in the washtub is possible.In this case, can be directly, or go out above the peak value purpose method of the voltage waveform of threshold values Vth to measure Th die-away time with another kind of number.In by the number peak value decision method of die-away time, motor on/off operation repeatedly repeatedly, on average or always to be added in the peak value number of voltage waveform under the repetition off-state, can judge that the reason of the fabric amount of article to be washed will be described below with reference to figure 4 with Th die-away time.Fabric weight and the relation between die-away time show in Fig. 4, wherein, curve I makes for so-called " mixed goods ", mixed goods is that various fabrics mixes, and supposition all is common and article to be washed actual family expenses, and curve II makes such as denim pants with abundant fabric for hard relatively.To see that by Fig. 4 under identical weight, the die-away time of the die-away time during for bottom weight during than the fabric that is curve I representative is short, thereby, the information that provides representative to compare with the article of curve I representative than heavy articles.When output is information when decision thus, for bottom weight, such as denim pants, the water level that sets will be higher than the water level that the fabric for curve I sets.This result is generally consistent with actual washing operation.
Therefore, according to from the representative of fabric quantity sensor 10 comprise that the detection signal of the number of articles to be washed of abundant degree decides output, washing agent injection rate and stirring time, can finish to pinpoint accuracy washing operation.
Table 1
| The fabric amount of washings | Die-away time th |
| Very little | 0.2-0.3 |
| Little | 0.16-0.2 |
| Medium | 0.1-0.16 |
| Specified | 0.1＞ |
Table 1 represented die-away time Th and the fabric amount of article to be washed between relation.This relation is to obtain with the fabric quantity sensor that shows among Fig. 2.In this example, according to die-away time (or peak value number of being counted), the fabric amount is divided into four grades.
The deficiency that prior art exists.
1, the sensor in the fabric amount detecting device is provided with separately
Above-mentioned existing skill this---the sensor in the fabric amount detecting device (to call clothes quantity detecting device in the following text) is the self-contained unit that is connected on the laundry motor, and its purposes only relies on the inertia of motor rotor shaft to rotate in lead-in wire 62 terminations of as shown in Figure 2 coil 61 when the outage of laundry motor and produces the induced electromotive force of having represented washing clothes information.In view of this, in order to obtain the induced electromotive force of representing washing clothes information, connecting independently in the rotating shaft of laundry motor, clothes quantity detecting device has following deficiency:
The manufacturing difficulty of a, laundry motor, the batch process of the motor that is unfavorable for doing washing;
The cost of b, laundry motor increases.
2, the setting of threshold voltage
Above-mentioned prior art--clothes quantity detecting device is provided with threshold voltage Vth (see figure 3) when obtaining the information of representing washing clothes from induced electromotive force, may produce following problem thus:
A, as shown in Figure 3 will record Tth, need record the peak value that induced electromotive force exceeds Vth.But because numerous disturbance factors, when detecting induced electromotive force and exceed the peak value of Vth, very easily producing misoperation near Vth critical, one of minority or most influence to Tth are very big, and this will cause the detection of laundry amounts information inaccurate;
B, for producing threshold voltage Vth, comparison circuit is set, therefore, will improve the cost of manufacture of checkout gear, reduce the reliability of single unit system, this also will cause the detection of laundry amounts information inaccurate.
Can't revise when 3, laundry electromechanics parameter is inconsistent.
Owing to the difference of laundry motor self and the mechanical wear that produces along with use, must cause the mechanical parameter of each motor inconsistent, if do not do washing the inconsistent correction of electromechanics parameter, will make the measurement of laundry amounts be difficult to follow certain standard, also will cause the detection of laundry amounts information inaccurate.
4, be unfavorable for the doing washing batch process (push away by last) of motor.
5, there is not the voltage ripple of power network indemnifying measure.
Existing situation in view of domestic electric power has fluctuation during line voltage.Because obtaining of laundry amounts information, be to obtain by the induced potential that coasting produces from motor outage back, therefore, the fluctuation of line voltage will have influence on the size of induced potential, if the fluctuation of line voltage is not recompensed, also will cause the detection of laundry amounts information inaccurate.
The purpose of this utility model will remedy the deficiencies in the prior art exactly, make and a kind ofly simple in structurely (do not set up the laundry amounts sensing apparatus, be applied to existing automatic washing machine and increase what cost hardly), clothes quantity detecting device easy to detect, that reliability is high, economical and practical.Another purpose, inconsistent to laundry electromechanics parameter, can revise.Be suitable for producing in batches, also have a purpose, can compensate voltage ripple of power network.
The utility model, the technical scheme that achieves the above object is to design a kind of clothes quantity detecting device that is used for washing machine, comprises laundry motor, single-chip microcomputer, by monolithic processor controlled drive circuit, it is characterized in that also comprising a sensing circuit, it is connected with the tap of laundry motor stator; A testing circuit, its input is connected with an I/O mouth of single-chip microcomputer with the output of sensing circuit output connection detection circuit.
It is as follows to belong to accompanying drawing of the present utility model:
Fig. 1 is the fabric quantity sensor schematic diagram of prior art automatic washing machine;
Fig. 2 is an existing skill fabric quantity sensor structure sketch originally;
Fig. 3 is that existing this fabric quantity sensor of skill is the induced electromotive force oscillogram;
Fig. 4 is the fabric amount of prior art fabric quantity sensor and the functional arrangement of die-away time;
Fig. 5 is a block diagram of the present utility model;
Fig. 6 is the utility model embodiment sketch;
Fig. 7 is the functional arrangement of the utility model cloth amount and cloth impedance.
Fig. 8 is that the utility model is worked as laundry amounts hour, and the back-emf of detection amplifies the square pulse that shaping obtains after full-wave rectification;
Fig. 9 is that the utility model is worked as laundry amounts when big, and the back-emf of detection amplifies the square pulse that shaping obtains after full-wave rectification;
Figure 10 is the relation curve that the utility model laundry amounts sensing apparatus gets difference and the laundry amounts size of Tb and Ta.
Figure 11 is the influence of voltage ripple of power network contrast benchmark.
In conjunction with the accompanying drawings the utility model is described in further detail below by embodiment.
As shown in Figure 5, the utility model consists of the following components:
A, single-chip microcomputer
It is core control part of the present utility model.Be used for sending and receiving information, control the harmonious work of whole device.
B, laundry motor
The laundry motor obtains the signal of representing the laundry amounts size in the utility model, send and testing circuit.
C, testing circuit
This partial circuit carries out shaping and amplification with the signal of the representative laundry amounts size that the laundry amounts sensing circuit is sent here, send with single-chip microcomputer and handles.
D, memory circuit
In this utility model, memory circuit is used for to the laundry amounts sensing circuit---and the laundry motor is owing to inaccurate correction of the inconsistent detection that brings of mechanical parameter.
Fig. 6 one is used for the clothes quantity detecting device of certain golden automatic washing machine.In Fig. 6, the 6805R3 that single-chip microcomputer is produced for MOTOROLA company; M1, C1, L1 form the laundry amounts sensing circuit; R4, IC3 and R5, R6, C2, V3 form shaping and amplifying circuit; IC4 combines with single-chip microcomputer and forms the memory circuit of this checkout gear; In addition, IC2-1, IC2-2, R1, R2, V1 and V2 form drive circuit, by Single-chip Controlling, drive laundry amounts sensing circuit operate as normal.
Among Fig. 6, IC1 is single-chip microcomputer 6805R3, and IC2-1 and IC2-2 are the reverse drive door, and IC3 is photoelectric coupled device TLP5212, and IC4 is electricity erasable memorizer (EPROM) 93C46.
Sensing circuit is inductance (L1) and capacitor (C1) series connection, and the other end of inductance (L1) is connected with laundry motor stator tap one end.Shaping and amplification detection circuit are that the input of resistance R 4 is connected with the output of sensing circuit, the other end of resistance R 4 is connected with photoelectric coupled device (IC3), and the input amplifier that the output of photoelectric coupled device (IC3) and resistance R 5, R6, capacitor C2, triode (V3) are formed connects to be pressed.Also be provided with memory circuit EPROM (IC4), the PA4 of itself and single-chip microcomputer, PA5, PA6, PA7 connects.Also be provided with voltage detecting circuit and be the get access to grid transformer (T1) of voltage of input, the transformer output is connected with the bridge full wave rectifier input, the filter capacitor in parallel with bridge full wave rectifier (C3), its output is connected with single-chip processor i/o mouth PDO through divider resistance RX.
Narrate the testing process of laundry amounts below.
1, detects principle
Since when water level one timing, the different (see figure 7)s of the cloth impedance that different cloth volume productions are given birth to.Therefore, can it be remained in operation with inertia by the motor sudden power under running well of will doing washing, detect its back-emf then, and obtain a square pulse (see figure 8) with amplifying shaping after this back-emf full-wave rectification, send the single-chip microcomputer (see figure 6) of sampling.This pulse train has reflected the damping process of cloth impedance to the coasting motor, that is by the little cloth amount that predicts of the cloudy Chinese People's Anti-Japanese Military and Political College of cloth, the cloth impedance can record like this: as shown in Figure 8, analyze the autotomy phase shift time of the 4th ripple establishing the beginning by cable of this pulse train, be the poor of Tb and Ta, handle by single-chip microcomputer, can learn the size of laundry amounts.For example, laundry amounts is less, and then the cloth impedance is just less, and the decay of the induced potential of motor is also just slower, is reflected on the pulse train, and the difference that is exactly phase shift time T b and the Ta of the 4th ripple is less with respect to laundry amounts more for a long time; Otherwise as shown in Figure 9, laundry amounts is bigger, the phase shift time T b of the 4th ripple and the difference of Ta with respect to laundry amounts more after a little while for bigger.Curve has reflected the difference of Tb and Ta and the relation of laundry amounts size among Figure 10.
2, the course of work
In Fig. 6, the single-chip microcomputer 6805R3 of program curing drives the laundry motor rotation by the drive circuit of control connection on its I/O mouth PC4, PC7, detect the laundry amounts of washing clothes, then with the signal of telecommunication of detected representative laundry amounts size after testing circuit carry out shaping and amplification, send I/O mouth PD7 with 6805R3, handle by the program that is solidificated in the 6805R3 ROM, generate the digital quantity of expression laundry amounts size, compare with existing standard, determine what grade of laundry amounts, so that 6805R3 control washing machine carries out gratifying laundry operations.
When making the mechanical parameter of motor inconsistent, and when causing laundry operations unreasonable, can adjust the benchmark of laundry amounts,, deposit IC4 in by 6805R3 control because of the laundry difference of motor self or the mechanical wear that produces along with use.The benchmark of so-called laundry amounts, promptly laundry amounts is the difference of 0 o'clock pairing Tb and Ta, this difference is stored in the fixed cell of memory circuit EEPROM.Detailed process is such, and as shown in figure 10, o.1 curve N is the relation curve of the difference of a certain reference laundry motor Tb and Ta with laundry amounts; Curve N o.3 for this laundry motor after using after a while Tb and the difference of Ta with the relation curve of laundry amounts; O.2, curve N is the difference of another laundry motor Tb and the Ta relation curve with laundry amounts.Memory circuit EPROM original stored be laundry amounts benchmark T01 with reference to laundry motor correspondence.For example, to same laundry motor,, when its corresponding curve becomes No.2 by No.1, at this moment, will cause inappropriate laundry operations by the laundry amounts form the basis that detects along with use.At this moment from new mensuration laundry amounts the difference of the Tb and the Ta of 0 o'clock correspondence, as shown in figure 10, be T03, T03 is deposited in the memory cell of memory circuit EPROM by Single-chip Controlling, just judge the size of laundry amounts in the clothes amount detection operation afterwards as standard, so just, can make correct judgement, make washing machine work satisfactory.
When fluctuation appears in line voltage, the benchmark of laundry amounts will change, and Figure 11 shows the fluctuation of line voltage to the relatively influence of benchmark.For this influence is compensated, after each sampling obtains the information of laundry amounts size, also to sample to the information of representing voltage ripple of power network by voltage detecting circuit, the digital quantity of correspondence compared when the digital quantity that obtains thus was 220V with supply voltage, draw the benchmark compensation rate, current benchmark is recompensed.Voltage detecting is to realize like this.Line voltage is carried out having behind transformation, bridge full-wave rectifier, the capacitor filtering aanalogvoltage of the sign power network fluctuation information that draws after divider resistance RX, the RY dividing potential drop, single-chip microcomputer from its I/O mouth PDO to this aanalogvoltage conversion, the result of conversion gained be digital quantity D1, this is measured the digital quantity D0 corresponding with 220V in the fixed cell that is solidificated in single-chip microcomputer compare.For example, current testing result is D1, and then the compensation rate Δ T of T0 is
Δ T=K (D1-D0) K is the slope of curve among Figure 11, and T0 at this moment is T01:
T01＝T0＋ΔT
Maximum characteristics of the present utility model are:
A, do not set up the laundry amounts sensor, the induced electromotive force that produces by the inertia of rotor when directly detecting the outage of laundry motor from the tap of laundry motor stator;
B, threshold voltage is not set, the obtaining of laundry amounts information is not to exceed the time T th (see figure 3) of first ripple of threshold voltage Vth to a last ripple according to the induced electromotive force that motor outage back produces, and is based on the have no progeny phase shift time (this time is counted when motor cuts off the power supply) of the induced electromotive force that produces n ripple after amplifying through the all-wave shaping of motor;
C, be provided with memory circuit, make this utility model---clothes quantity detecting device has certain self-learning function, this will remedy because of the inconsistent clothes amount detection that causes of electromechanics parameter inaccurate.
D, be provided with voltage detecting circuit, the information of detection of grid voltage pulsation makes this utility model---and clothes quantity detecting device can compensate the influence that clothes amount detection produces voltage ripple of power network.
Claims (5)
1, a kind of clothes quantity detecting device that is used for washing machine, comprise laundry motor, single-chip microcomputer, by monolithic processor controlled drive circuit, it is connected with the tap of laundry motor stator to it is characterized in that also comprising a sensing circuit, a testing circuit, its input is connected with an I/O mouth of single-chip microcomputer with the output of sensing circuit output connection detection circuit.
2, device according to claim 1 is characterized in that sensing circuit is inductance (L1) and capacitor (C1) series connection, and the other end of inductance (L1) is connected with laundry motor stator tap one end.
3, device according to claim 1, it is characterized in that shaping and amplification detection circuit are that the input of resistance R 4 is connected with the output of sensing circuit, the other end of resistance R 4 is connected with photoelectric coupled device (IC3), and the output of photoelectric coupled device (IC3) is connected with the input amplifier that resistance R 5, R6, capacitor C2, triode (V3) are formed.
4, device according to claim 1 is characterized in that, is provided with memory circuit EPROM (IC4), the CS of IC4, SK, DI, DO pin respectively with the PA4 of single-chip microcomputer, PA5, PA6, the PA7 pin connects.
5, device according to claim 1, it is characterized in that being provided with voltage detecting circuit and be the get access to grid transformer (T1) of voltage of input, the transformer output is connected with the bridge full wave rectifier input, the filter capacitor in parallel with the bridge full wave rectifier type (C3), its output is connected with single-chip processor i/o mouth PDO through divider resistance RX.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94247477 CN2246163Y (en) | 1994-12-17 | 1994-12-17 | Dress amount testing device for washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94247477 CN2246163Y (en) | 1994-12-17 | 1994-12-17 | Dress amount testing device for washing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2246163Y true CN2246163Y (en) | 1997-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94247477 Expired - Fee Related CN2246163Y (en) | 1994-12-17 | 1994-12-17 | Dress amount testing device for washing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2246163Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451212C (en) * | 2003-06-30 | 2009-01-14 | 乐金电子(天津)电器有限公司 | Device and method for detecting clothes weight in drum washing machine |
| CN101906706A (en) * | 2010-06-18 | 2010-12-08 | 深圳和而泰智能控制股份有限公司 | Cloth weight testing method and controller for washing machine and washing machine |
| CN102063076A (en) * | 2010-10-31 | 2011-05-18 | 合肥荣事达洗衣设备制造有限公司 | Full-automatic washing machine high precision fuzzy control circuit and method thereof |
-
1994
- 1994-12-17 CN CN 94247477 patent/CN2246163Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451212C (en) * | 2003-06-30 | 2009-01-14 | 乐金电子(天津)电器有限公司 | Device and method for detecting clothes weight in drum washing machine |
| CN101906706A (en) * | 2010-06-18 | 2010-12-08 | 深圳和而泰智能控制股份有限公司 | Cloth weight testing method and controller for washing machine and washing machine |
| CN102063076A (en) * | 2010-10-31 | 2011-05-18 | 合肥荣事达洗衣设备制造有限公司 | Full-automatic washing machine high precision fuzzy control circuit and method thereof |
| CN102063076B (en) * | 2010-10-31 | 2012-12-12 | 合肥荣事达洗衣设备制造有限公司 | Full-automatic washing machine high precision fuzzy control circuit and method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: PATENTEE ADDRESS; FROM: NO. 74, KOUBEIDA STREET, XIN STREET, BEIJING CITY, 100035 TO: 9/F,ZHONGCHENG BUILDING, 19-1, HAIDIAN ROAD, BEIJING CITY, 100080 |
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| CP03 | Change of name, title or address |
Address after: 100080, Haidian Road, 19-1, Cheng Cheng, building 9, Beijing Patentee after: Beijing AI Pu Asia Pacific Electronics Co., Ltd. Address before: 100035 No. 74 North Main Street, Beijing, Xinjiekou Patentee before: Beijing AI Pu Asia Pacific Electronics Co., Ltd. |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |