CN101526388A - Self-weighing method for drum-type washing machine - Google Patents
Self-weighing method for drum-type washing machine Download PDFInfo
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Abstract
The invention relates to a self-weighing method for a drum-type washing machine. Firstly, controlling a motor to reach a first preset speed and to rotate at the first preset speed constantly, and measuring the torque of the motor rotating constantly at the first preset speed; secondly, controlling the motor to accelerate from the first preset speed to a second preset speed, and measuring the accelerating torque of the motor accelerating from the first preset speed to the second preset speed; thirdly, controlling the motor to rotate constantly at the second preset speed, and measuring the torque of the motor rotating constantly at the second preset speed; and finally, working out a corresponding load torque by subtracting an average value of the torque of the motor rotating constantly at the first preset speed and the torque of the motor rotating constantly at the second preset speed from the accelerating torque of the motor accelerating from the first preset speed to the second preset speed according to the test results, and after a correction step, comparing the obtained load torque with a curve, pre-stored in a computer controller of the washing machine, of the corresponding relation of a load torque and a load weight to obtain a most similar weight data. The method has the advantages of high test accuracy and short test time.
Description
Technical field
The present invention relates to the method that a kind of roller washing machine is weighed automatically, be particularly related to and a kind ofly accelerating to the different of required torque of certain rotating speed and torque when a certain speed at the uniform velocity turns round under the different loading conditions, thereby accurately detect the method that the roller washing machine of laundry item weight in the washing machine is weighed automatically by testing of electric motors.
Background technology
Washing machine comprises body, gate, tube, clothing tube, driving and control system are filled with water, gate is positioned at the front of body or end face to open and close, the tube that is filled with water is fixed in the body by hitch, be the cylindrical shape of opening towards gate, the clothing tube is installed in the tube that is filled with water, the rotation of drive systems motor, whole washing process of control system control washing machine.
Present user provides suitable water level in the laundry function of the time wishing to do washing automatically according to the weight of clothing, thereby avoid blindly selecting, cause and do not wash clean or the situation of water wasting expense electricity takes place, so, present washing machine all has the function of automatic detection washing clothes weight, the user is as long as put into washing clothes in the clothing tube, choose mode of washing, and press starting switch, washing machine will detect the weight that is put into the washing clothes in the clothing tube automatically, automatically add the water that is complementary with laundry amount again, just begin whole washing process then.
Wait to wash the method for laundry amounts for automatic detection, what roller washing machine generally adopted at present is the method that adds Weighing module, as publication number is that the Chinese patent " a kind of Weighing method of washing machine and realize as described in the washing machine of method " of CN1690291 discloses a kind of method of utilizing Weighing module to detect laundry amounts, this method is the air damp type that a resiliency supported vibration damper in the washing machine is made as the band displacement transducer, cylinder block by the band abutment ring, be fixed on the coil former on the cylinder block, coil, coil interface, the ferromagnetic piston bar of band abutment ring and endoporus and sealing ring are formed, displacement transducer is connected with microprocessor through Weighing module, Weighing module comprises rectification, low-pass filtering, high-gain is amplified, timing sequence generating, circuit and interfaces such as square wave, and then the weight of the laundry item in the detection washing machine.This utilization adds the method for Weighing module, and not only cost height, and installation is also relatively more difficult.
In addition, in order to improve accuracy of detection and to reduce cost, in the prior art, also have the roller washing machine utilization detect motor under the different loads condition rotating speed and reach parameters such as needed time of a certain rotating speed, voltage, carry out the detection of laundry amount.
As notification number is the Chinese patent " tumbling-box washing machine " of CN1350086, disclose a kind of detection method of washing weight, in the moment that begins to wash running, by FEEDBACK CONTROL the rotating speed of motor is risen to after the 100rpm, under the power supply to motor is certain state motor is quickened, the rotating speed that detects motor becomes rise time till the 230rpm from 110rpm.Motor rises to after the 300rpm, makes it be free rotation state, and the rotating speed that detects motor drops to fall time till the 200rpm from 290rpm.After this, detect the weight of washings with rise time and fall time.In this weight detecting, detect equilibrium state according to the ratio of rise time and fall time, according to this testing result correction weight, this kind method need be tested rotating speed rise time and rotating speed fall time respectively, can cause the time of test longer.
Publication number is the Chinese patent " method for sensing amount of laundry of washing machine " of CN1566458 for another example, it is in the washing machine that utilizes anti-phase motor direct-drive washing tube or stirrer, comprise by forming, if washing instruction input, the stage that stirrer is quickened are promptly arranged with the next stage; The rotational speed of stirrer is reached the stage that the required time of setting speed carries out timing; The time that timing is obtained compares with the clothing scale of having set of separating by time, thereby detects the stage of laundry amounts.
And for example publication number is the Chinese patent " method of tumbling-box washing machine and detection clothes weight thereof " of CN1821477, it can calculate the ratio that is applied to the input voltage of motor by phased, till motor reaches definite revolution, thus clothes weight or the centrifugal amount of clothing in the cylinder that accurately detection is contained in motor is connected.This tumbling-box washing machine comprises: motor is used to make the cylinder rotation; And control module, be used for controlling the revolution of this motor, and calculate the magnitude of voltage of the ratio of the input voltage that is applied to this motor, i.e. calculating change, to determine to be contained in the clothes weight in this cylinder according to washing operation.
Above-mentioned these methods are in application, and very big the time, error may be bigger, do not reach the requirement of weighing automatically for less load or friction force.
Summary of the invention
Fundamental purpose of the present invention is to address the above problem, and provides a kind of detection time short, and treats the method that the roller washing machine of measuring clothes weight is weighed automatically in can the high Precision Detection washing machine.
For achieving the above object, the method that provides a kind of roller washing machine to weigh automatically in the present invention,
Washing machine preestablishes first desired speed, second desired speed of motor, and the corresponding relation parameter of electric motor load torque and load weight, and weighing automatically comprises the steps:
First step, the control motor makes motor reach first desired speed, and motor is at the uniform velocity rotated with first desired speed, measures the torque of motor this moment;
Second step, the control motor makes motor accelerate to second desired speed from first desired speed, measures the rising torque of motor when first desired speed rises to second desired speed;
Third step, the control motor at the uniform velocity rotates with second desired speed, measures the torque of motor this moment;
The 4th step according to the testing result of above-mentioned first step to third step, is calculated corresponding load torque;
The 5th step according to the load torque that calculates, is further determined the load weight of washing machine.
Further improvement of the present invention is, in above-mentioned first step, also comprise: before the control motor reaches first desired speed, comprise that also controlling motor earlier for one makes motor reach three desired speed higher than second desired speed, is decelerated to the process of first desired speed again.
In above-mentioned first step, the control motor makes motor after beginning startup, reaches the 3rd desired speed with peak acceleration.
In above-mentioned second step, the control motor makes motor reach second desired speed with peak acceleration from first desired speed.
Load torque in above-mentioned the 4th step is based on that the resulting difference of mean value that the rising torque that rises to second desired speed from first desired speed with described motor deducts the torque of at the uniform velocity rotating with first desired speed and second desired speed determines.
Preferably, comprise also in above-mentioned the 4th step that is revised a step: after calculating a load torque, repeat at least once above-mentioned first to fourth step again, the load torque numerical value that at every turn draws is averaged, as final load torque.
The load weight of the washing machine in above-mentioned the 5th step, be based on the described load torque that calculates and compare, thereby determine a weight data the most akin with having deposited the load torque in the washing machine computer controller and the corresponding relation curve of load weight in.
Content to sum up, the present invention by testing of electric motors in required torque that accelerates to certain rotating speed under the different loading conditions and the torque when a certain speed at the uniform velocity turns round, the torque that the torque that records during with rising records when deducting at the uniform velocity, just obtain the torque of load when motor rotates, by calculating the weight that just can obtain load, this kind method solved better little load current change not obvious and load friction force is greatly more for a long time, the bigger problem of measuring of numerical value deviation, thereby make weigh automatically more accurate, precision is higher, adopt this kind method to shorten the test duration in addition, just can measure data exactly about 30 seconds.
Before the control motor reaches first desired speed, having increased elder generation's control motor makes motor reach three desired speed higher than second desired speed, be decelerated to the process of first desired speed again, the clothing of doing in the clothing tube well is being affixed under the bigger centrifugal action on the inwall of clothing tube, not only can improve accuracy of detection, also can shorten detection time in addition.
In the process that the clothing in the clothing tube is weighed automatically, the equilibrium state of clothing may not be certain in the clothing tube, even the clothing of identical weight, because the difference of equilibrium state, torque and the rising torque all to some extent difference of its motor when at the uniform velocity rotating, cause the reduction of accuracy of detection for fear of this species diversity, so the present invention has increased the step of a correction, just adopted repeated detection to calculate load torque, the method of averaging then, so just be enough to revise because the detection deviation that difference caused of equilibrium state further improves accuracy of detection.
Description of drawings
Fig. 1 is the structural representation of a kind of roller washing machine of the present invention;
Fig. 2 is a process flow diagram of the present invention;
Fig. 3 is the graph of relation of load torque and load weight.
As shown in Figure 1 to Figure 3, body 1, gate 2, the tube 3 that is filled with water, clothing tube 4, motor 5, supply channel 6, discharge pipe line 7, draining valve 8, water intaking valve 9.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
As shown in Figure 1, washing machine comprises body 1, gate 2, tube 3, clothing tube 4, control panel, driving and control system are filled with water.Body 1 whole rectangular casing shape, gate 2 is arranged on its positive middle part, the tube 3 that is filled with water is fixed in the body 1 by hitch, be the cylindrical shape of opening towards gate 2, clothing tube 4 is installed in the tube 2 that is filled with water, open clothing that gate 2 just can input will be washed in clothing tube 4 or with its taking-up, control panel is arranged on the surface of body 1, be used for the selection that the user carries out washing procedure, drive system can be rotated by drive motor 5, clothing tube 4 is connected by the rotating shaft of bearing with motor 5, therefore drive motor 5 rotates and just can directly drive 4 rotations of clothing tube, thus the clothing in the washing clothes tube 4, whole washing process of control system control washing machine, according to the laundry amounts that detects by control module, water level and the program for washing of setting according to the user, the Automatic Control program for washing.
Washing machine tube 3 the top that is filled with water is connected to supply channel 6, be used in the tube 3 that is filled with water, infeeding the required washings of washing, tube 3 the bottom that is filled with water is connected to discharge pipe line 7, discharge pipe line 7 is to be used for will being filled with water when washing process finishes washings discharge in the tube 3, on discharge pipe line 7, be provided with a draining valve 8, on supply channel 6, be provided with a water intaking valve 9.
During laundry, at first open gate 2, in clothing tube 4, drop into the clothing that needs washing, drop into washing powder in the washing powder input port on being located at supply channel 6 then, the energized switch, the user according to the kind select operating mode of washings, imports the instruction of start-up operation on control panel, the washing machine control system promptly begins to control whole operating process.
After program for washing starts, at first to detect the laundry amounts of putting in the clothing tube 4, open water intaking valve 9 then, infeed the washings that are mixed with washing powder by supply channel 6 in the tube 3 that is filled with water, water inlet lasts till that always water reaches till the water level that is complementary with detected laundry amounts.
When the water level in washing machine is filled with water tube 3 did not reach designated water level, water intaking valve 9 was opened always, and when water level reached designated water level, control module will send steering order water intaking valve 9 is closed, thereby stopped to supply water in the tube 3 that is filled with water.At this moment, the water that joins in the tube 3 that is filled with water can be absorbed by the clothing in the clothing tube 4, and the water level in the tube 3 that is filled with water can descend, and therefore, also needs to replenish water inlet with top identical method, up to the water level that reaches regulation fully.
After the water level in the tube 3 that is filled with water reached predetermined water level, washing machine just can begin washing procedure, and after washing operation was finished, the tube 3 following draining valves 8 that are filled with water will be opened, and the washings in the tube 3 that is filled with water are discharged, and then carry out dehydrating operations.
Carried out once more draining valve 8 cutting out behind the official hour at dehydrating operations, opened water intaking valve 9, in the tube 3 that is filled with water, added new water, begun to carry out the rinsing operation.
After the rinsing operation of having carried out the stipulated time, carry out dehydrating operations again, said process repeatedly is all over last powered-down switch, end operation to all laundry operations processes.
Below with reference to Fig. 2 and Fig. 3 workflow of the present invention is described.
The user opens gate 2 earlier, in clothing tube 4, drop into the clothing that needs washing, close gate 2, drop into washing powder in the washing powder input port on being located at supply channel 6 then, the energized switch, the user according to the kind select operating mode of washings, imports the instruction of start-up operation on control panel, the washing machine control system promptly begins to control whole operating process.
After program for washing starts, at first to detect the laundry amounts of putting in the clothing tube 4, at this moment, CPU on the computer controller in the washing machine control system sends the instruction of weighing and gives the frequency conversion plate, after CPU on the frequency conversion plate receives instruction, start working, enter the program of weighing by CPU drive motor 5.
Washing machine preestablishes first desired speed, second desired speed of motor 5, and the corresponding parameters relationship curve of motor 5 load torques and load weight, and deposits in the washing machine computer controller, and concrete steps are as follows:
First step: at first, drive motor 5 starts, drive 4 rotations of clothing tube, motor 5 is carried out FEEDBACK CONTROL, so that the rotating speed of motor 5 rapidly increases to the 3rd desired speed (for example being 300rpm), make the washing clothes in the clothing tube 4 be attached to preferably on the circumferential inner wall of clothing tube 4 owing to action of centrifugal force, in order washing clothes to be attached on the circumferential inner wall of clothing tube 4 better, more quickly, also in order to shorten detection time, can control motor 5 and rise to the 3rd desired speed (300rpm) simultaneously with peak acceleration.
Then, control the rotating speed of motor 5 again and reduce to first desired speed (for example being 100rpm) with maximum deceleration, at this moment, also can descend with the acquiescence retarded velocity of motor 5, and control motor 5 at the uniform velocity turns round at first desired speed (100rpm), measure the torque M 1 of motor 5 this moment by torque master, and store torque M 1.
Second step: control motor 5 makes motor 5 accelerate to second desired speed (for example being 150rpm) from first desired speed (100rpm), measure the rising torque M 3 of motor 5 when first desired speed (100rpm) rises to second desired speed (150rpm), and storage torque M 3.
When first desired speed (100rpm) rises to second desired speed (150rpm), can control motor 5 and rise with peak acceleration, also can rise with the acquiescence acceleration of motor.
Third step: control motor 5 at the uniform velocity rotates with second desired speed (150rpm), measures the torque M 2 of motor 5 this moment by torque master, and stores torque M 2.
The 4th step: according to the testing result of above-mentioned first step to third step, calculate corresponding load torque M, the following formula of the foundation of load torque M calculates:
M=M3-(M1+M2)/2
Under perfect condition, just can judge according to the above-mentioned load torque M that testing result drew once the clothing tube in the clothing tube 4, but the equilibrium state of the clothing in the clothing tube 4 may not be certain, even the clothing of identical weight, because the difference of equilibrium state, torque and the rising torque all to some extent difference of its motor when at the uniform velocity rotating causes the reduction of accuracy of detection for fear of this species diversity, so the present invention has increased the step of a correction.
The step of revising comprises: after calculating a load torque M by preceding four steps, repeat at least once above-mentioned first to fourth step again, comparatively ideal situation is to repeat above-mentioned steps again twice, and I haven't seen you for ages can not get comparatively ideal correction result for number of times, and number of times is crossed at most can prolong detection time.
The numerical value of the load torque M that at every turn draws is averaged, as final load torque M '.
The 5th step:, further determine the load weight G of washing machine according to the load torque M ' that calculates.
The load weight G of washing machine is based on the described load torque M ' that calculates and compares with depositing the load torque in the washing machine computer controller and the corresponding relation curve of load weight in, thereby determines a weight data the most akin.
As shown in Figure 3, the corresponding relation curve of load torque and load weight draws by comparison test repeatedly, and deposits in advance in the washing machine computer controller, and the horizontal ordinate among Fig. 3 is a load weight, and ordinate is a load torque.
The present invention is set at 100rpm and 150rpm respectively with first desired speed and second desired speed, be not specific numerical value, first desired speed can be set in any number between the 100rpm to 150rpm, second desired speed can correspondingly be set at any number between the 150rpm to 200rpm, 100rpm and 150rpm are most preferred numerical value, and accuracy of detection can be higher.
In first step, at first the rotating speed with motor 5 rises to the 3rd desired speed (300rpm) with peak acceleration, the 3rd desired speed is set at than second desired speed (150rpm) height, be for the clothing in the clothing tube 4 being affixed on the inwall of clothing tube 4 better, further improving accuracy of detection.
After washing machine detects the weight of laundry item in the foundation above-mentioned steps, just can determine the corresponding standard water level, and then begin all washing procedures according to laundry amounts.
As mentioned above, given in conjunction with the accompanying drawings and embodiments scheme content can derive the similar techniques scheme.In every case be the content that does not break away from technical solution of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all still belong in the scope of technical solution of the present invention according to technical spirit of the present invention.
Claims (7)
1, a kind of roller washing machine method of weighing automatically, it is characterized in that: washing machine preestablishes first desired speed, second desired speed of motor, and the corresponding relation parameter of electric motor load torque and load weight, and weighing automatically comprises the steps:
First step, the control motor makes motor reach first desired speed, and motor is at the uniform velocity rotated with first desired speed, measures the torque of motor this moment;
Second step, the control motor makes motor accelerate to second desired speed from first desired speed, measures the rising torque of motor when first desired speed rises to second desired speed;
Third step, the control motor at the uniform velocity rotates with second desired speed, measures the torque of motor this moment;
The 4th step according to the testing result of above-mentioned first step to third step, is calculated corresponding load torque;
The 5th step according to the load torque that calculates, is further determined the load weight of washing machine.
2, the roller washing machine according to claim 1 method of weighing automatically is characterized in that, also comprises in the above-mentioned first step:
Before the control motor reaches first desired speed, comprise that also controlling motor earlier for one makes motor reach three desired speed higher than second desired speed, is decelerated to the process of first desired speed again.
3, the roller washing machine according to claim 2 method of weighing automatically is characterized in that: in above-mentioned first step, the control motor makes motor after beginning to start, and reaches the 3rd desired speed with peak acceleration.
4, the method for weighing automatically according to any described roller washing machine of claim 1 to 3 is characterized in that: in above-mentioned second step, the control motor makes motor reach second desired speed with peak acceleration from first desired speed.
5, the roller washing machine according to claim 1 method of weighing automatically, it is characterized in that: the load torque in above-mentioned the 4th step is based on that the resulting difference of mean value that the rising torque that rises to second desired speed from first desired speed with described motor deducts the torque of at the uniform velocity rotating with first desired speed and second desired speed determines.
6, the roller washing machine according to claim 5 method of weighing automatically, it is characterized in that, comprise also in above-mentioned the 4th step that is revised a step: after calculating a load torque, repeat at least once above-mentioned first to fourth step again, the load torque numerical value that at every turn draws is averaged, as final load torque.
7, the method for weighing automatically according to claim 5 or 6 described roller washing machines, it is characterized in that: the load weight of the washing machine in above-mentioned the 5th step, be based on the described load torque that calculates and compare, thereby determine a weight data the most akin with having deposited the load torque in the washing machine computer controller and the corresponding relation curve of load weight in.
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