Dishwasher fault diagnosis method and dishwasher

Abstract

The present invention provides a dishwasher fault judgment method and a dishwasher, the dishwasher fault judgment method comprises the following steps: step S102, obtaining the working speed V of the washing arm; step S104, comparing the working speed V with the target speed V0, if the working speed V is the same as the target speed V0, then judging that the dishwasher is fault-free; if the working speed V is different from the target speed V0, then judging that the dishwasher is faulty. The dishwasher fault judgment method of the present invention solves the problem of poor accuracy of fault judgment of dishwashers in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of dishwasher failure analysis, and in particular to a dishwasher failure judgment method and a dishwasher. Background Art

[0002] A dishwasher may have various faults during use, such as the washing arm being unable to rotate due to foreign matter being stuck, the washing arm speed being reduced due to foreign matter being stuck, washing arm structural faults, faults, etc. At present, manual observation is often used to determine whether a dishwasher has a fault during inspection. This judgment method requires the operator to have rich experience, and the judgment reliability is poor, which is prone to misjudgment. Summary of the invention

[0003] The main purpose of the present invention is to provide a dishwasher fault judgment method and a dishwasher, so as to solve the problem of poor accuracy in fault judgment of dishwashers in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a method for diagnosing a fault in a dishwasher is provided, comprising the following steps: step S102, obtaining the operating rotational speed V of the washing arm; step S104, comparing the operating rotational speed V with the target rotational speed V0, if the operating rotational speed V is the same as the target rotational speed V0, then a judgment is made that the dishwasher has no fault; if the operating rotational speed V is different from the target rotational speed V0, then a judgment is made that the dishwasher has a fault.

[0005] Furthermore, when the operating speed V is different from the target speed V0, the dishwasher fault judgment method also includes: step S106, comparing the operating speed V with 0, if the operating speed V is greater than 0, a judgment is made that a fault occurs at the washing arm; if the operating speed V is 0, a judgment is made that a fault occurs at the motor used to drive the washing arm to rotate.

[0006] Furthermore, when the operating speed V is greater than 0, the dishwasher fault judgment method further includes: step S108, controlling the input voltage of the motor used to drive the washing arm to rotate to increase, and obtaining the current speed V of the washing arm t ; Set the current speed V t Compared with the target speed V0, if the current speed V t When the target speed V0 is reached, the cleaning arm is temporarily blocked. t If the target rotation speed V0 is not reached, it is determined that a structural failure of the washing arm has occurred.

[0007] Furthermore, when the operating speed is 0, the dishwasher fault judgment method also includes: step S110, comparing the working current I of the motor with 0, if the working current I of the motor is 0, making a judgment that the motor is short-circuited; if the working current I of the motor is greater than 0, making a judgment that the washing arm is stuck.

[0008] Furthermore, step S108 includes: controlling the input voltage U of the motor to increase to a set voltage U S ; Get the current speed V of the cleaning arm t , and the current speed V t Compare with the target speed V0; if the current speed V t When the target speed V0 is reached, the cleaning arm is temporarily blocked. t If the target rotation speed V0 is not reached, it is determined that a structural failure of the washing arm has occurred.

[0009] Furthermore, the voltage U is set S It is 110% to 120% of the target voltage U0 of the motor; wherein the target voltage U0 is the voltage when the motor drives the cleaning arm to rotate at the target speed V0.

[0010] Further, step S108 includes the following steps: step S1082, comparing the input voltage U of the motor with the critical voltage U max For comparison, if the input voltage U is less than the critical voltage U max , then execute step S1084; otherwise, make a judgment that the structure of the cleaning arm is faulty; step S1084, control the input voltage U of the motor to increase the predetermined value U a , get the current speed V of the cleaning arm t ; Set the current speed V t Compared with the target speed V0, if the current speed V t If the target rotation speed V0 is reached, it is determined that the cleaning arm is temporarily stuck; otherwise, step S1082 is executed.

[0011] Furthermore, the predetermined value U a It is 1% to 5% of the target voltage U0 of the motor; wherein the target voltage U0 is the voltage when the motor drives the cleaning arm to rotate at the target speed V0.

[0012] Furthermore, step S108 includes: continuously increasing the input voltage U of the motor and obtaining the current speed V of the cleaning arm in real time. t ; Set the current speed V t Compared with the target speed V0, if the current speed V t When the target speed V0 is reached, the cleaning arm is temporarily blocked. If the input voltage U of the motor increases to the critical voltage U max When the current speed Vt If the target rotation speed V0 is still not reached, it is determined that the structure of the cleaning arm is faulty.

[0013] Further, the dishwasher fault judgment method includes step S101, step S101 is located before step S102, and step S101 includes: step S1012, detecting whether there is a speed parameter input, if there is no speed parameter input, setting the working speed V to the second preset value; if there is a speed parameter input, executing step S1014; step S1014, comparing the input speed parameter with the first preset value, if the speed parameter is equal to the first preset value, setting the working speed V to the first preset value; otherwise, executing step S1016; step S1016, comparing the input speed parameter with the second preset value, if the speed parameter is equal to the second preset value, setting the working speed V to the second preset value, otherwise, setting the speed parameter to the third preset value.

[0014] According to another aspect of the present invention, a dishwasher is provided, comprising: a washing arm, the washing arm being rotatably arranged around a predetermined axis; a speed control device, the speed control device being used to obtain an operating speed V of the washing arm, and compare the operating speed V with a target speed V0, if the operating speed V is the same as the target speed V0, it is determined that the dishwasher has no fault; if the operating speed V is different from the target speed V0, it is determined that the dishwasher has a fault.

[0015] Furthermore, a nozzle is provided on the washing arm, and the dishwasher comprises: a liquid supply pipeline, which is connected to the nozzle to supply washing liquid to the nozzle; a rotation driving device, which is connected to the washing arm to drive the washing arm to rotate around a predetermined axis; the rotation driving device comprises a motor; a speed control device is connected to the motor to control the input voltage of the motor; wherein the speed control device comprises a speed detection module and a current detection module, and the speed detection module is connected to the washing arm to detect the speed of the washing arm; the current detection module is connected in series with the motor to detect the working current of the motor.

[0016] Furthermore, the dishwasher includes an alarm device, and the speed control device is connected to the alarm device so as to control the alarm device to send out an alarm signal through the speed control device.

[0017] The method for judging a dishwasher fault using the technical solution of the present invention comprises the following steps: step S102, obtaining the working speed V of the washing arm; step S104, comparing the working speed V with the target speed V0, if the working speed V is the same as the target speed V0, then judging that the dishwasher is fault-free; if the working speed V is different from the target speed V0, then judging that the dishwasher is faulty. By obtaining the working speed V of the washing arm and comparing the working speed V with the target speed V0, when the working speed V is the same as the target speed V0, it can be seen that the washing arm rotates normally at the set speed without stagnation or jamming, and then judging that the dishwasher is fault-free; when the working speed V is different from the target speed V0, it can be seen that the washing arm fails to rotate normally at the set speed, and thus judging that the dishwasher is faulty. In this way, it is convenient to judge whether the dishwasher is faulty. Compared with the subjective judgment by the operator, the judgment result is more accurate, which solves the problem of poor accuracy in judging the fault of the dishwasher in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram showing a flow chart of an embodiment of a method for determining a fault of a dishwasher according to the present invention;

[0020] Figure 2 A schematic diagram showing a judgment process according to an embodiment of a method for judging a dishwasher fault according to the present invention is shown;

[0021] Figure 3 A schematic diagram of a working speed setting process according to an embodiment of a method for determining a fault of a dishwasher according to the present invention is shown;

[0022] Figure 4 A schematic diagram showing a first perspective of a first partial structure of an embodiment of a dishwasher according to the present invention;

[0023] Figure 5 A schematic diagram showing a second partial structure of an embodiment of a dishwasher according to the present invention from a second viewing angle is shown.

[0024] The above drawings include the following reference numerals:

[0025] 1. Cleaning arm; 2. Nozzle; 3. Liquid supply pipeline; 4. Rotation drive device; 5. Speed ​​control device. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Please refer to Figures 1 to 3 The present invention provides a dishwasher fault judgment method, comprising the following steps: step S102, obtaining the working rotation speed V of the washing arm 1; step S104, comparing the working rotation speed V with the target rotation speed V0, if the working rotation speed V is the same as the target rotation speed V0, then judging that the dishwasher has no fault; if the working rotation speed V is different from the target rotation speed V0, then judging that the dishwasher has fault.

[0028] The dishwasher fault judgment method of the present invention comprises the following steps: step S102, obtaining the working speed V of the washing arm 1; step S104, comparing the working speed V with the target speed V0, if the working speed V is the same as the target speed V0, then the dishwasher is judged to be fault-free; if the working speed V is different from the target speed V0, then the dishwasher is judged to be faulty. By obtaining the working speed V of the washing arm 1 and comparing the working speed V with the target speed V0, when the working speed V is the same as the target speed V0, it can be known that the washing arm 1 rotates normally at the set speed without stagnation, jamming, etc., and then the dishwasher is judged to be fault-free; when the working speed V is different from the target speed V0, it can be known that the washing arm 1 fails to rotate normally at the set speed, and thus the dishwasher can be judged to be faulty. In this way, it is convenient to judge whether the dishwasher has a fault, and compared with the subjective judgment method by the operator, the judgment result is more accurate, which solves the problem of poor accuracy of fault judgment of the dishwasher in the prior art.

[0029] When the working speed V is different from the target speed V0, in order to further clarify the fault location, the dishwasher fault judgment method also includes: step S106, comparing the working speed V with 0, if the working speed V is greater than 0, the washing arm 1 can rotate, it may be temporarily stuck or its structure has a fault, then it can be judged that a fault has occurred at the washing arm 1, and the fault range is narrowed to the washing arm 1; if the working speed V is 0, it means that the motor cannot drive the washing arm 1 to rotate, it may be that the motor has a fault or the washing arm 1 is stuck and the motor cannot rotate, then it is judged that a fault has occurred at the motor used to drive the washing arm 1 to rotate.

[0030] Based on the above solution, the fault range of the dishwasher can be effectively narrowed. On this basis, in order to more accurately determine the fault of the dishwasher, the following solution can be adopted:

[0031] When the operating speed V is greater than 0, the dishwasher fault judgment method further includes: step S108, controlling the input voltage of the motor used to drive the washing arm 1 to rotate to increase, and obtaining the current speed V of the washing arm 1 t ; Set the current speed V t Compared with the target speed V0, if the current speed V t When the target speed V0 is reached, it is determined that the cleaning arm 1 is temporarily stuck; by temporarily increasing the input voltage of the motor, the motor speed is increased, which can solve the problem of the cleaning arm 1 being stuck due to some small impurities. Not only can the cause of the fault be determined to be the temporary sticking of the cleaning arm 1, but the sticking problem can also be eliminated. t If the target rotation speed V0 is not reached, it is determined that the structure of the washing arm 1 is faulty, which means that the cause of the fault is not the blocking of the washing arm 1, but may be the structural fault of the washing arm 1.

[0032] When the operating speed is 0, the dishwasher fault judgment method also includes: step S110, comparing the working current I of the motor with 0, if the working current I of the motor is 0, it means that there is a short circuit inside the motor, and then a judgment is made that the motor is short-circuited; if the working current I of the motor is greater than 0, it means that the internal circuit of the motor is normal, and the cause of the fault is that the washing arm 1 is stuck and the motor cannot rotate normally.

[0033] In the above scheme, there are many ways to increase the input voltage of the motor:

[0034] In the first implementation, step S108 includes: controlling the input voltage U of the motor to increase to a set voltage U S ; Get the current speed V of cleaning arm 1 t , and the current speed V t Compare with the target speed V0; if the current speed V t When the target speed V0 is reached, it is determined that the cleaning arm 1 is temporarily stuck; if the current speed V t If the target rotation speed V0 is not reached, it is determined that the structure of the washing arm 1 is faulty.

[0035] Preferably, the voltage U is set S It is 110% to 120% of the target voltage U0 of the motor; wherein the target voltage U0 is the voltage when the motor drives the cleaning arm 1 to rotate at the target speed V0.

[0036] In this way, by instantly increasing the motor input voltage U to a larger set voltage U S , which is conducive to instantly increasing the speed of the motor, thereby facilitating the removal of obstacles around the cleaning arm 1, and the operation is also relatively simple and convenient. Preferably, the voltage U is set SIt is applied to the motor in the form of pulses to prevent the motor from being damaged due to long-term overload.

[0037] In the second implementation, step S108 includes the following steps: step S1082, comparing the input voltage U of the motor with the critical voltage U max For comparison, if the input voltage U is less than the critical voltage U max , then execute step S1084; otherwise, make a judgment that the structure of the cleaning arm 1 is faulty; step S1084, control the input voltage U of the motor to increase the predetermined value U a , get the current speed V of cleaning arm 1 t ; Set the current speed V t Compared with the target speed V0, if the current speed V t If the target rotation speed V0 is reached, it is determined that the cleaning arm 1 is temporarily stuck; otherwise, step S1082 is executed.

[0038] Preferably, the predetermined value U a It is 1% to 5% of the target voltage U0 of the motor; wherein the target voltage U0 is the voltage when the motor drives the cleaning arm 1 to rotate at the target speed V0.

[0039] In this way, by increasing the voltage to the motor in a stepwise manner, not only can the cause of the fault be confirmed and the jam be eliminated more quickly, but also the severity of the jam of the washing arm 1 can be judged according to the level of the applied voltage, thereby better understanding the situation of the dishwasher.

[0040] In the third implementation, step S108 includes: continuously increasing the input voltage U of the motor, and obtaining the current rotation speed V of the cleaning arm 1 in real time. t ; Set the current speed V t Compared with the target speed V0, if the current speed V t When the target speed V0 is reached, it is determined that the cleaning arm 1 is temporarily stuck; if the input voltage U of the motor increases to the critical voltage U max When the current speed V t If the target speed V0 is still not reached, it is determined that the structure of the washing arm 1 is faulty. The method of continuously increasing the input voltage U of the motor is the safest method of operation, which can effectively reduce the impact on the motor, is conducive to protecting the motor, and can quantitatively determine the severity of the blocking of the washing arm 1.

[0041] When a malfunction of the dishwasher is detected, in order to more effectively alert the operator, when it is determined that the washing arm 1 is temporarily stuck, the control alarm device sends a first signal; when it is determined that the structure of the washing arm 1 is faulty, the control alarm device sends a second signal; when it is determined that the motor is short-circuited, the control alarm device sends a third signal; when it is determined that the washing arm 1 is stuck, the control alarm device sends a fourth signal.

[0042] In order to conveniently control the working speed V of the washing arm 1, the dishwasher fault judgment method includes step S101, and step S101 is located before step S102. Step S101 includes: step S1012, detecting whether there is a speed parameter input, if there is no speed parameter input, setting the working speed V to a second preset value; if there is a speed parameter input, executing step S1014; step S1014, comparing the input speed parameter with the first preset value, if the speed parameter is equal to the first preset value, setting the working speed V to the first preset value; otherwise, executing step S1016; step S1016, comparing the input speed parameter with the second preset value, if the speed parameter is equal to the second preset value, setting the working speed V to the second preset value, otherwise, setting the speed parameter to the third preset value.

[0043] Preferably, the third preset value is 40% of the rated speed of the motor; the first preset value is 70% of the rated speed of the motor; and the second preset value is equal to the rated speed of the motor.

[0044] Please refer to Figure 4 and Figure 5 The present invention also provides a dishwasher, which includes: a washing arm 1, which is rotatably arranged around a predetermined axis; a speed control device 5, which is used to obtain an operating speed V of the washing arm 1 and compare the operating speed V with a target speed V0. If the operating speed V is the same as the target speed V0, it is determined that the dishwasher has no fault; if the operating speed V is different from the target speed V0, it is determined that the dishwasher has a fault.

[0045] In addition, a nozzle 2 is provided on the washing arm 1, and the dishwasher includes: a liquid supply pipeline 3, which is connected to the nozzle 2 to supply cleaning liquid to the nozzle 2; a rotation drive device 4, which is connected to the washing arm 1 to drive the washing arm 1 to rotate around a predetermined axis; the rotation drive device 4 includes a motor; a speed control device 5 is connected to the motor to control the input voltage of the motor; wherein the speed control device 5 includes a speed detection module and a current detection module, the speed detection module is connected to the washing arm 1 to detect the speed of the washing arm 1; the current detection module is connected in series with the motor to detect the working current of the motor. In this way, the working speed V of the washing arm 1 can be easily obtained through the speed detection module, so as to compare it with the target speed V0, and then it can be conveniently determined whether the dishwasher has a fault. By setting the current detection module, the current of the motor can be easily detected, so as to determine whether the motor has a fault, which is conducive to more accurate positioning of the fault position. The speed control device can receive the speed signal and the current signal, and can control the input voltage of the motor, so that the fault of the dishwasher can be accurately located by the above-mentioned methods such as analyzing the working speed V of the washing arm 1, increasing the input voltage U of the motor, and analyzing the working current I of the motor, which effectively facilitates the fault detection of the dishwasher and solves the problem of inconvenient fault location of the dishwasher in the prior art.

[0046] In order to more effectively remind the operator to perform maintenance on the dishwasher, the dishwasher includes an alarm device, and the speed control device 5 is connected to the alarm device so that the speed control device 5 controls the alarm device to send an alarm signal.

[0047] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0048] The dishwasher fault judgment method of the present invention comprises the following steps: step S102, obtaining the working speed V of the washing arm 1; step S104, comparing the working speed V with the target speed V0, if the working speed V is the same as the target speed V0, then the dishwasher is judged to be fault-free; if the working speed V is different from the target speed V0, then the dishwasher is judged to be faulty. By obtaining the working speed V of the washing arm 1 and comparing the working speed V with the target speed V0, when the working speed V is the same as the target speed V0, it can be known that the washing arm 1 rotates normally at the set speed without stagnation, jamming, etc., and then the dishwasher is judged to be fault-free; when the working speed V is different from the target speed V0, it can be known that the washing arm 1 fails to rotate normally at the set speed, and thus the dishwasher can be judged to be faulty. In this way, it is convenient to judge whether the dishwasher has a fault, and compared with the subjective judgment method by the operator, the judgment result is more accurate, which solves the problem of poor accuracy of fault judgment of the dishwasher in the prior art.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for determining a dishwasher fault, characterized in that: The following steps are involved: Step S102, obtaining the operating speed V of the cleaning arm (1); Step S104, comparing the working speed V with the target speed V0, if the working speed V is the same as the target speed V0, then it is determined that the dishwasher is not faulty; if the working speed V is different from the target speed V0, then it is determined that the dishwasher is faulty; When the operating speed V is different from the target speed V0, the dishwasher fault judgment method further includes: Step S106, comparing the working speed V with 0, if the working speed V is greater than 0, determining that a fault has occurred at the washing arm (1); if the working speed V is 0, determining that a fault has occurred at the motor for driving the washing arm (1) to rotate; When the operating speed V is greater than 0, the dishwasher fault judgment method further includes: Step S108, control the input voltage of the motor used to drive the cleaning arm (1) to rotate to increase, and obtain the current rotational speed Vt of the cleaning arm (1); compare the current rotational speed Vt with the target rotational speed V0, if the current rotational speed Vt reaches the target rotational speed V0, determine that the cleaning arm (1) is temporarily stuck; if the current rotational speed Vt does not reach the target rotational speed V0, determine that the structure of the cleaning arm (1) has failed.

2. The dishwasher fault diagnosis method according to claim 1, characterized in that: When the operating speed is 0, the dishwasher fault judgment method further includes: Step S110, compare the working current I of the motor with 0. If the working current I of the motor is 0, it is determined that the motor is short-circuited; if the working current I of the motor is greater than 0, it is determined that the cleaning arm (1) is stuck.

3. The dishwasher fault diagnosis method according to claim 1, characterized in that: The step S108 includes: Control the input voltage U of the motor to increase to the set voltage U S ; The current rotation speed Vt of the cleaning arm (1) is obtained, and the current rotation speed Vt is compared with the target rotation speed V0; if the current rotation speed Vt reaches the target rotation speed V0, a ​​judgment is made that the cleaning arm (1) is temporarily stuck; if the current rotation speed Vt does not reach the target rotation speed V0, a ​​judgment is made that a structural failure of the cleaning arm (1) occurs.

4. The dishwasher fault determination method according to claim 3, characterized in that: The set voltage U S is 110% to 120% of the target voltage U0 of the motor; wherein the target voltage U0 is the voltage when the motor drives the cleaning arm (1) to rotate at the target speed V0.

5. The dishwasher fault diagnosis method according to claim 1, characterized in that: The step S108 comprises the following steps: Step S1082, comparing the input voltage U of the motor with the critical voltage Umax, if the input voltage U is less than the critical voltage Umax, executing step S1084; otherwise, determining that the structure of the cleaning arm (1) is faulty; Step S1084, control the input voltage U of the motor to increase to a predetermined value Ua, obtain the current rotational speed Vt of the cleaning arm (1); compare the current rotational speed Vt with the target rotational speed V0, if the current rotational speed Vt reaches the target rotational speed V0, determine that the cleaning arm (1) is temporarily stuck; otherwise, execute step S1082.

6. The dishwasher fault determination method according to claim 5, characterized in that: The predetermined value Ua is 1% to 5% of the target voltage U0 of the motor; wherein the target voltage U0 is the voltage when the motor drives the cleaning arm (1) to rotate at the target rotation speed V0.

7. The dishwasher fault diagnosis method according to claim 1, characterized in that: The step S108 includes: Continuously increasing the input voltage U of the motor and acquiring the current rotation speed Vt of the cleaning arm (1) in real time; The current rotational speed Vt is compared with the target rotational speed V0. If the current rotational speed Vt reaches the target rotational speed V0, it is determined that the cleaning arm (1) is temporarily stuck. If the current rotational speed Vt still does not reach the target rotational speed V0 when the input voltage U of the motor increases to a critical voltage Umax, it is determined that a structural failure of the cleaning arm (1) occurs.

8. The method for determining a dishwasher fault according to any one of claims 1 to 7, characterized in that: The dishwasher fault judgment method comprises step S101, which is located before step S102, and step S101 comprises: Step S1012, detecting whether there is a speed parameter input, if there is no speed parameter input, setting the working speed V to a second preset value; if there is a speed parameter input, executing step S1014; Step S1014, comparing the inputted speed parameter with a first preset value, if the speed parameter is equal to the first preset value, setting the working speed V to the first preset value; otherwise, executing step S1016; Step S1016: compare the input speed parameter with the second preset value. If the speed parameter is equal to the second preset value, set the working speed V to the second preset value; otherwise, set the speed parameter to the third preset value.

9. A dishwasher, characterized in that: The dishwasher comprises: A cleaning arm (1), wherein the cleaning arm (1) is rotatably arranged around a predetermined axis; A speed control device (5), the speed control device (5) is used to obtain the working speed V of the washing arm (1), and compare the working speed V with the target speed V0, if the working speed V is the same as the target speed V0, then it is determined that the dishwasher is not faulty; if the working speed V is different from the target speed V0, then it is determined that the dishwasher is faulty; When the working speed V is different from the target speed V0, the working speed V is compared with 0. If the working speed V is greater than 0, a judgment is made that a fault has occurred at the cleaning arm (1); if the working speed V is 0, a judgment is made that a fault has occurred at the motor for driving the cleaning arm (1) to rotate; When the working speed V is greater than 0, the input voltage of the motor used to drive the washing arm (1) to rotate is controlled to increase, and the current speed Vt of the washing arm (1) is obtained; the current speed Vt is compared with the target speed V0, and if the current speed Vt reaches the target speed V0, it is determined that the washing arm (1) is temporarily stuck; if the current speed Vt does not reach the target speed V0, it is determined that the structure of the washing arm (1) is faulty.

10. The dishwasher according to claim 9, characterized in that The washing arm (1) is provided with a spray head (2), and the dishwasher comprises: a liquid supply pipeline (3), the liquid supply pipeline (3) being in communication with the nozzle (2) so as to supply cleaning liquid to the nozzle (2); a rotation drive device (4), the rotation drive device (4) being connected to the cleaning arm (1) to drive the cleaning arm (1) to rotate around the predetermined axis; the rotation drive device (4) comprising a motor; the speed control device (5) being connected to the motor to control the input voltage of the motor; The rotation speed control device (5) comprises a rotation speed detection module and a current detection module, wherein the rotation speed detection module is connected to the cleaning arm (1) to detect the rotation speed of the cleaning arm (1); and the current detection module is connected in series with the motor to detect the working current of the motor.

11. The dishwasher according to claim 10, characterized in that The dishwasher comprises an alarm device, and the speed control device (5) is connected to the alarm device so as to control the alarm device to send out an alarm signal through the speed control device (5).

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