Booster pump control method and device and computer readable storage medium

Abstract

The invention discloses a booster pump control method and device and a computer readable storage medium. The method comprises the steps that the working current of a motor is obtained; determining the torque current of the motor according to the working current; and if the torque current is greater than a current threshold value, controlling the motor to reduce the rotating speed. The motor is controlled to reduce the rotating speed, so that the torque current of the motor is smaller than or equal to the current threshold value, the pressure value of the maximum working point of the booster pump is smaller than or equal to the pressure threshold value, the pressure value of the maximum working point of the booster pump is prevented from being further increased, and pump head abrasion of the booster pump is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid pumps, and in particular to a control method, device and computer-readable storage medium for a booster pump. Background Art

[0002] In the current booster pump pressure protection scheme, the booster pump head is mainly protected by structural improvement. When the booster pump outlet pressure is too high, the pressure relief valve inside the booster pump opens to prevent the booster pump output pressure from further increasing, thereby protecting the booster pump head. However, the pressure relief valve will wear out, and the length of time the pressure relief valve fails determines the life of the booster pump, increasing the maintenance cost of the booster pump. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method, device and computer-readable storage medium for a booster pump, aiming to solve the problem of high maintenance cost of the booster pump.

[0004] To achieve the above object, the present invention provides a control method for a booster pump, the control method for the booster pump comprising the following steps:

[0005] Get the working current of the motor;

[0006] Determining the torque current of the motor according to the working current;

[0007] If the torque current is greater than the current threshold, the motor is controlled to reduce the rotation speed.

[0008] Optionally, before the step of controlling the motor to reduce the speed if the torque current is greater than the current threshold, the step further includes:

[0009] Get the pressure value corresponding to the maximum working point of the booster pump;

[0010] Determining a pressure threshold according to the pressure value and a preset ratio;

[0011] The current threshold is determined according to the pressure threshold and a preset coefficient.

[0012] Optionally, before the step of determining the current threshold according to the pressure threshold and the preset coefficient, the step further includes:

[0013] Determining a torque coefficient according to the corresponding relationship between the torque current and the motor torque;

[0014] Determining a pressure coefficient according to a correspondence between the motor torque and the pressure value of the maximum pressure point;

[0015] A preset coefficient is determined according to the product of the torque coefficient and the pressure coefficient.

[0016] Optionally, the step of controlling the motor to reduce the rotation speed includes:

[0017] Determining the frequency at which the torque current of the motor is greater than the current threshold;

[0018] If the frequency is greater than the preset frequency, the motor is controlled to reduce the speed according to the preset first speed;

[0019] If the frequency is less than or equal to the preset frequency, the motor is controlled to reduce the speed according to the preset second speed; the first speed is greater than the second speed.

[0020] Optionally, the step of controlling the motor to reduce the rotation speed includes:

[0021] If the continuous working time of the boost pump is longer than the preset time, the motor is controlled to reduce the speed until the torque current is less than the current threshold;

[0022] If the continuous working time of the boost pump is less than or equal to the preset time, the motor is controlled to reduce the rotation speed until the torque current is equal to the current threshold.

[0023] Optionally, the step of controlling the motor to reduce the rotation speed includes:

[0024] Determining a reduction amount of the motor speed according to a difference between the torque current and the current threshold;

[0025] Controlling the motor to gradually reduce the rotation speed according to the reduction amount;

[0026] Return to the step of obtaining the working current of the motor until the torque current is less than or equal to the current threshold.

[0027] Optionally, after the step of determining the torque current of the motor according to the working current, the step further includes:

[0028] If the torque current is less than or equal to the current threshold and after the preset cycle condition is met, return to the step of obtaining the working current of the motor;

[0029] Wherein, satisfying the preset cycle condition includes at least one of the following:

[0030] The operating time of the boost pump is greater than a preset time threshold;

[0031] The increase in the load of the boost pump is greater than a preset load threshold.

[0032] Optionally, the step of determining the torque current of the motor according to the working current includes:

[0033] When the working current is a three-phase current, the three-phase current is converted into the torque current according to a preset Clarke transformation and a preset Park transformation;

[0034] When the working current is a direct current, the torque current is determined to be the direct current.

[0035] To achieve the above-mentioned purpose, the present invention also provides a control device for a boost pump, which includes a memory, a processor, and a control program for the boost pump stored in the memory and executable on the processor. When the control program for the boost pump is executed by the processor, the various steps of the control method for the boost pump as described above are implemented.

[0036] To achieve the above objectives, the present invention further provides a computer-readable storage medium, which stores a control program for a booster pump. When the control program for the booster pump is executed by a processor, the various steps of the control method for the booster pump as described above are implemented.

[0037] The present invention provides a control method, device and computer-readable storage medium for a booster pump, which obtains the working current of a motor; determines the torque current of the motor according to the working current; and controls the motor to reduce the speed if the torque current is greater than the current threshold. By controlling the motor to reduce the speed, the torque current of the motor is less than or equal to the current threshold, and the pressure value of the maximum working point of the booster pump is less than or equal to the pressure threshold, thereby avoiding further increase in the pressure value of the maximum working point of the booster pump, reducing the wear of the booster pump head, and reducing the number of times the pressure relief valve set inside the booster pump is triggered to open, compared with the scheme of setting a pressure relief valve, avoiding the maintenance cost caused by the wear of the pressure relief valve, and saving the use cost of the booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the hardware structure of a control device for a booster pump according to an embodiment of the present invention;

[0039] Figure 2 It is a flow chart of a first embodiment of a method for controlling a booster pump according to the present invention;

[0040] Figure 3 It is a flow chart of a second embodiment of a method for controlling a booster pump according to the present invention;

[0041] Figure 4 It is a detailed flow chart of step S30 of the third embodiment of the control method of the booster pump of the present invention;

[0042] Figure 5 It is a detailed flow chart of step S30 of the fourth embodiment of the control method of the booster pump of the present invention;

[0043] Figure 6 This is a detailed flowchart diagram of step S30 of the fifth embodiment of the booster pump control method of the present invention.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0046] The main solution of the embodiment of the present invention is: obtaining the working current of the motor; determining the torque current of the motor according to the working current; if the torque current is greater than the current threshold, controlling the motor to reduce the rotation speed.

[0047] By controlling the motor to reduce the speed so that the torque current of the motor is less than or equal to the current threshold, the pressure value of the maximum operating point of the boost pump is less than or equal to the pressure threshold, thereby avoiding further increase in the pressure value of the maximum operating point of the boost pump, reducing the wear of the boost pump head, and compared with the solution of setting a pressure relief valve, reducing the number of times the pressure relief valve set inside the boost pump is triggered to open, avoiding the maintenance cost caused by the wear of the pressure relief valve, and saving the use cost of the boost pump.

[0048] As an implementation, the control device of the booster pump can be as follows Figure 1 shown.

[0049] The embodiment of the present invention relates to a control device for a booster pump, which includes: a processor 101, such as a CPU, a memory 102, and a communication bus 103. The communication bus 103 is used to realize the connection and communication between these components. Optionally, the control device of the booster pump can be a controller set inside the booster pump. Optionally, the booster pump is set in a device such as a water dispenser, and the control device of the booster pump is a controller of the device such as a water dispenser.

[0050] The memory 102 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Figure 1 As shown, the memory 102 as a computer-readable storage medium may include a control program for the booster pump; and the processor 101 may be used to call the control program for the booster pump stored in the memory 102 and perform the following operations:

[0051] Get the working current of the motor;

[0052] Determining the torque current of the motor according to the working current;

[0053] If the torque current is greater than the current threshold, the motor is controlled to reduce the rotation speed.

[0054] Optionally, the processor 101 may be used to call a control program of the booster pump stored in the memory 102, and perform the following operations:

[0055] Get the pressure value corresponding to the maximum working point of the booster pump;

[0056] Determining a pressure threshold according to the pressure value and a preset ratio;

[0057] The current threshold is determined according to the pressure threshold and a preset coefficient.

[0058] Optionally, the processor 101 may be used to call a control program of the booster pump stored in the memory 102, and perform the following operations:

[0059] Determining a torque coefficient according to the corresponding relationship between the torque current and the motor torque;

[0060] Determining a pressure coefficient according to a correspondence between the motor torque and the pressure value of the maximum pressure point;

[0061] A preset coefficient is determined according to the product of the torque coefficient and the pressure coefficient.

[0062] Optionally, the processor 101 may be used to call a control program of the booster pump stored in the memory 102, and perform the following operations:

[0063] Determining the frequency at which the torque current of the motor is greater than the current threshold;

[0064] If the frequency is greater than the preset frequency, the motor is controlled to reduce the speed according to the preset first speed;

[0065] If the frequency is less than or equal to the preset frequency, the motor is controlled to reduce the speed according to the preset second speed; the first speed is greater than the second speed.

[0066] Optionally, the processor 101 may be used to call a control program of the booster pump stored in the memory 102, and perform the following operations:

[0067] If the continuous working time of the boost pump is longer than the preset time, the motor is controlled to reduce the speed until the torque current is less than the current threshold;

[0068] If the continuous working time of the boost pump is less than or equal to the preset time, the motor is controlled to reduce the rotation speed until the torque current is equal to the current threshold.

[0069] Optionally, the processor 101 may be used to call a control program of the booster pump stored in the memory 102, and perform the following operations:

[0070] Determining a reduction amount of the motor speed according to a difference between the torque current and the current threshold;

[0071] Controlling the motor to gradually reduce the rotation speed according to the reduction amount;

[0072] Return to the step of obtaining the working current of the motor until the torque current is less than or equal to the current threshold.

[0073] Optionally, the processor 101 may be used to call a control program of the booster pump stored in the memory 102, and perform the following operations:

[0074] If the torque current is less than or equal to the current threshold and after the preset cycle condition is met, return to the step of obtaining the working current of the motor;

[0075] Wherein, satisfying the preset cycle condition includes at least one of the following:

[0076] The operating time of the boost pump is greater than a preset time threshold;

[0077] The increase in the load of the boost pump is greater than a preset load threshold.

[0078] Optionally, the processor 101 may be used to call a control program of the booster pump stored in the memory 102, and perform the following operations:

[0079] When the working current is a three-phase current, the three-phase current is converted into the torque current according to a preset Clarke transformation and a preset Park transformation;

[0080] When the working current is a direct current, the torque current is determined to be the direct current.

[0081] Based on the hardware architecture of the control device of the booster pump, an embodiment of the control method of the booster pump of the present invention is proposed.

[0082] Reference Figure 2 , Figure 2 This is a first embodiment of a method for controlling a booster pump according to the present invention. The method for controlling a booster pump comprises the following steps:

[0083] Step S10, obtaining the working current of the motor.

[0084] Optionally, the booster pump is provided with a motor, wherein the motor is used to drive the pump head of the booster pump so that the pump head pressure of the booster pump changes. Optionally, the booster pump can be applied to application scenarios such as water heater pressure boosting and low water pressure in high-rise buildings. Optionally, the booster pump can specifically be a diaphragm booster pump, wherein the diaphragm booster pump can be used in a water purifier.

[0085] Optionally, the motor includes a brushed motor or a brushless motor. A brushed motor is powered by direct current, so it is generally called a brushed motor or a DC motor, and a brushless motor is an AC motor, specifically a three-phase AC permanent magnet motor.

[0086] Since BLDC (Brushless Direct Current Motor) motors have high efficiency, low energy consumption, and brushless motors have no brushes, the friction is greatly reduced during operation, the operation is smooth, and the noise is much lower, which can be better used in environments that require silence, such as home appliances, industrial automation, and the medical industry. In addition, the structural characteristics of brushless motors determine their long life. Within a reasonable range of use, brushless motors basically do not require additional maintenance costs. Optionally, the FOC (field-oriented control) algorithm is used to control the BLDC motor to drive the booster pump, which has the advantages of long life and no brush sparks, and can be applied to more life scenarios. Optionally, the VC (VectorCtrol) algorithm is used to control the BLDC motor, which has the advantages of strong controllability of head and flow, and low noise.

[0087] Optionally, when the motor is a DC motor, the operating current is DC; when the motor is an AC motor, the operating current is AC. For example, when the motor is a BLDC, the operating current is three-phase AC, ie, three-phase current.

[0088] Step S20, determining the torque current of the motor according to the working current.

[0089] Optionally, the torque current is used to drive the motor to generate torque, wherein the torque current is a direct current.

[0090] Optionally, when the working current is direct current, the torque current is determined to be a direct current, that is, the torque current is equal to the direct current.

[0091] Optionally, when the working current is a three-phase current, the three-phase current is transformed by Clarke Transformation and Park's Transformation to obtain the torque current I of the q axis in the dq coordinate system. q .

[0092] Step S30: If the torque current is greater than the current threshold, the motor is controlled to reduce the rotation speed.

[0093] Optionally, the current threshold may be a preset current value.

[0094] Optionally, the current threshold can be determined by the torque current before the pressure relief valve opens. When the water outlet pressure of the booster pump is too high, in order to prevent the pressure output by the booster pump from further increasing, the pressure relief valve inside the booster pump opens. The torque current corresponding to the preset time length before the pressure relief valve opens is counted, and the mean or minimum value of the torque current is obtained according to the statistics to determine the current threshold.

[0095] Optionally, if the torque current is greater than the current threshold, it means that the pressure of the boost pump head is too high and there is a risk of damaging the boost pump head. The motor speed is reduced to reduce the torque current and thereby reduce the pressure of the boost pump head.

[0096] Optionally, if the torque current is less than or equal to the current threshold, it means that the pressure of the boost pump head does not exceed the limit value, and there is no risk of damaging the boost pump head. At this time, the motor is controlled to maintain the current speed.

[0097] Optionally, if the torque current is less than the current threshold and after the preset cycle condition is met, return to step S10 to step S30; wherein, meeting the preset cycle condition includes at least one of the following: the operating time of the boost pump is greater than the preset time threshold; the change in the load of the boost pump is greater than the preset load threshold.

[0098] Optionally, when the torque current is less than or equal to the current threshold, it indicates that the pressure of the boost pump head is still within an acceptable range. At this time, it is only necessary to operate at the original motor speed. When the running time of the boost pump is greater than the preset time threshold, return to execute steps S10 to S30 to avoid changes in the torque current during the operation of the boost pump.

[0099] Optionally, when the torque current is less than or equal to the current threshold, it indicates that the pressure of the boost pump head is still within an acceptable range. At this time, the motor only needs to run at the original speed. If the increase in the load of the boost pump is greater than the preset load threshold, in order to ensure the working effect of the boost pump, the torque current of the boost pump will increase accordingly. There may be a risk of exceeding the current threshold, that is, the pressure value of the maximum operating point of the boost pump head may be greater than the pressure threshold. Therefore, the process returns to step S10 to step S30 to avoid changes in the torque current caused by changes in the load during the operation of the boost pump.

[0100] Optionally, if the torque current is greater than the current threshold, while controlling the motor to reduce the speed, the pressure relief valve provided inside the boost pump can be controlled to open to prevent the output pressure of the boost pump from further increasing. Optionally, if the torque current is greater than the current threshold, within a preset time after the motor is controlled to reduce the speed, if the torque current is still greater than the current threshold, the pressure relief valve provided inside the boost pump is controlled to open to prevent wear of the boost pump head.

[0101] Optionally, if the torque current is less than the working current, indicating that the pressure value of the boost pump head has not reached the target pressure value, the motor speed is controlled to increase until the torque current is equal to the working current to ensure the working effect of the boost pump; wherein, the preset working current is determined based on the target pressure value of the maximum working point of the boost pump and the preset coefficient.

[0102] Optionally, the working current is determined according to the target pressure value and the preset coefficient, exemplarily as shown in the following formula:

[0103] P 2 =k 3 *I q2 ;

[0104] Among them, P 2 Indicates the target pressure value; k 3 Indicates the preset coefficient; I q2 Indicates the operating current.

[0105] Optionally, the preset coefficient k 3 Can be pre-set.

[0106] Optionally, the torque coefficient k is determined according to the corresponding relationship between the torque current and the motor torque. 1 ; Determine the pressure coefficient k based on the correspondence between the motor torque and the pressure value at the maximum pressure point 2 ; According to the product of the torque coefficient and the pressure coefficient, determine the preset coefficient k 3 .

[0107] Optionally, multiple groups of experimental data are obtained through experiments, wherein each group of experimental data includes a torque current and a corresponding motor torque thereof. Each group of data is plotted in a coordinate system, and multiple data points are fitted to obtain a corresponding relationship between the torque current and the motor torque. According to the corresponding relationship between the torque current and the motor torque, the torque coefficient is determined as shown in the following formula:

[0108] T′=k 1 *I q ′;

[0109] Among them, k 1 represents the torque coefficient, T′ represents the motor torque, I q ′ represents the torque current of the motor.

[0110] Optionally, multiple groups of experimental data are obtained through experiments, wherein each group of experimental data includes the motor torque and the corresponding boost pump pressure, i.e., the pressure value of the maximum pressure point. Each group of data is plotted in a coordinate system, and multiple data points are fitted to obtain the corresponding relationship between the motor torque and the pressure value of the maximum pressure point, and determine the pressure coefficient, as shown in the following formula:

[0111] P′=k2 *T′

[0112] Among them, k 2 represents the pressure coefficient, P′ represents the boost pump pressure, and T′ represents the motor torque.

[0113] Optionally, according to the torque coefficient k 1 and pressure coefficient k 2 The product of determines the preset coefficient, as shown in the following formula:

[0114] k 3 =k 1 *k 2 .

[0115] In the technical solution of this embodiment, the working current of the motor is obtained; the torque current of the motor is determined according to the working current; if the torque current is greater than the current threshold, the motor is controlled to reduce the speed. By controlling the motor to reduce the speed, the torque current of the motor is less than or equal to the current threshold, and the pressure value of the maximum working point of the booster pump is less than or equal to the pressure threshold, so as to avoid further increase in the pressure value of the maximum working point of the booster pump, reduce the wear of the booster pump head, and reduce the number of times the pressure relief valve set inside the booster pump is triggered to open, compared with the solution of setting a pressure relief valve, avoid the maintenance cost caused by the wear of the pressure relief valve, and save the use cost of the booster pump.

[0116] Reference Figure 3 , Figure 3 This is a second embodiment of the control method of the booster pump of the present invention. Based on the first embodiment, before step S30, it also includes:

[0117] Step S40, obtaining the pressure value corresponding to the maximum working point of the booster pump;

[0118] Step S50, determining a pressure threshold according to the pressure value and a preset ratio;

[0119] Step S60: determining the current threshold according to the pressure threshold and a preset coefficient.

[0120] Optionally, the maximum operating point of the booster pump may be a pressure point where the pump head of the booster pump is subjected to the greatest force.

[0121] Optionally, the pressure threshold is a preset ratio of the pressure value corresponding to the maximum working point of the booster pump. Exemplarily, it is shown in the following formula:

[0122] P 1 =k 4 *P;

[0123] Among them, P 1 represents the pressure threshold; P represents the pressure value of the maximum working point of the booster pump; k 4represents the preset ratio, which can be adjusted according to the actual working condition of the booster pump. For example, the maximum working point pressure value of the booster pump is P = 1.2 MPa. 4 =1.1, that is, the pressure threshold P 1 =1.32mpa.

[0124] Optionally, the current threshold is determined according to the pressure threshold and the preset coefficient, exemplarily as shown in the following formula:

[0125] P 1 =k 3 *I q ;

[0126] Among them, P 1 represents the pressure threshold; k 3 Indicates the preset coefficient; I q Indicates the current threshold.

[0127] Optionally, the preset coefficient k 3 Can be pre-set.

[0128] Optionally, the torque coefficient k is determined according to the corresponding relationship between the torque current and the motor torque. 1 ; Determine the pressure coefficient k based on the correspondence between the motor torque and the pressure value at the maximum pressure point 2 ; According to the product of the torque coefficient and the pressure coefficient, determine the preset coefficient k 3 .

[0129] Optionally, after experiments, multiple groups of data are measured, each group of data includes a torque current and a corresponding motor torque, each group of data is plotted in a coordinate system, multiple data points are fitted to form a curve, and the corresponding relationship between the torque current and the motor torque is obtained. According to the corresponding relationship between the torque current and the motor torque, the torque coefficient is determined as shown in the following formula:

[0130] T′=k 1 *I q ′;

[0131] Among them, k 1 represents the torque coefficient, T′ represents the motor torque, I q ′ represents the torque current of the motor.

[0132] Optionally, after experiments, multiple groups of data are measured, each group of data includes the motor torque and the corresponding boost pump pressure, that is, the pressure value of the maximum pressure point. Each group of data is plotted in a coordinate system, and multiple data points are fitted to form a curve to obtain the corresponding relationship between the motor torque and the pressure value of the maximum pressure point, and determine the pressure coefficient, as shown in the following formula:

[0133] P′=k 2 *T′

[0134] Among them, k 2 represents the pressure coefficient, P′ represents the boost pump pressure, and T′ represents the motor torque.

[0135] Optionally, according to the torque coefficient k 1 and pressure coefficient k 2 The product of determines the preset coefficient, as shown in the following formula:

[0136] k 3 =k 1 *k 2 .

[0137] In the technical solution of this embodiment, the current threshold is accurately determined by the pressure threshold and the preset coefficient. When the torque current is greater than the current threshold, the motor is controlled to reduce the speed so that the pressure value of the maximum operating point of the boost pump is less than or equal to the pressure threshold, thereby avoiding further increase in the pressure value of the maximum operating point of the boost pump and reducing the wear of the boost pump head.

[0138] Reference Figure 4 , Figure 4 This is a third embodiment of the control method of the booster pump of the present invention, based on the first or second embodiment, the step S30 includes:

[0139] Step S31, determining the frequency at which the torque current of the motor is greater than the current threshold;

[0140] Step S32, if the frequency is greater than the preset frequency, controlling the motor to reduce the speed according to the preset first speed;

[0141] Step S33: if the frequency is less than or equal to the preset frequency, the motor is controlled to reduce the speed according to a preset second speed; the first speed is greater than the second speed.

[0142] Optionally, the frequency of the torque current of the motor being greater than the current threshold within a preset time period is determined as shown in the following formula:

[0143] q = Q / t;

[0144] Wherein, q represents the frequency that the torque current is greater than the current threshold, Q represents the number of times that the torque current is greater than or equal to the current threshold within a preset time length, and t represents the preset time length.

[0145] Optionally, if the frequency at which the torque current of the motor is greater than the current threshold is greater than a preset frequency, it indicates that the pressure value of the maximum operating point of the boost pump is often in an overpressure state, and the motor is controlled to reduce the speed according to the preset first speed, so that the torque current of the motor is rapidly reduced to avoid wear on the pump head of the boost pump. Optionally, the motor is controlled to reduce the speed according to the preset first speed, that is, the current speed of the motor is controlled to reduce the preset first speed.

[0146] Optionally, if the frequency at which the torque current of the motor is greater than the current threshold is greater than a preset frequency, the pressure relief valve provided inside the boost pump may be controlled to open to prevent the output pressure of the boost pump from further increasing.

[0147] Optionally, if the frequency at which the torque current of the motor is greater than the current threshold is less than or equal to the preset frequency, it indicates that the pressure value of the maximum operating point of the boost pump is not often in an overpressure state, and the motor is controlled to reduce the speed according to the preset second speed, wherein the first speed is greater than the second speed, so that the torque current of the motor is reduced, so that the torque current is less than or equal to the current threshold, avoiding wear on the pump head of the boost pump while ensuring the working efficiency of the boost pump. Optionally, the motor is controlled to reduce the speed according to the preset second speed, that is, the current speed of the motor is controlled to reduce the preset second speed.

[0148] In the technical solution of the present embodiment, the motor is controlled to reduce its speed by the frequency at which the torque current of the motor is greater than the current threshold, that is, the speed of the motor is adjusted according to the working condition of the motor so that the pressure value of the maximum operating point of the boost pump is less than or equal to the pressure threshold, thereby avoiding further increase in the pressure value of the maximum operating point of the boost pump and reducing the wear of the boost pump head.

[0149] Reference Figure 5 , Figure 5 This is a fourth embodiment of the control method of the booster pump of the present invention, based on any one of the first to third embodiments, the step S30 includes:

[0150] Step S34, if the continuous working time of the boost pump is greater than the preset time, the motor is controlled to reduce the speed until the torque current is less than the current threshold;

[0151] Step S35: If the continuous working time of the boost pump is less than or equal to the preset time, the motor is controlled to reduce the speed until the torque current is equal to the current threshold.

[0152] Optionally, the continuous working time of the booster pump may be the continuous working time of the booster pump from the start of operation to the current time. Optionally, the continuous working time of the booster pump may also be the cumulative working time, that is, the cumulative working time of the booster pump in a preset time period, for example, in one day, the operating time from 11 am to 12 pm is 1 hour, and the operating time from 14 pm to 16 pm is 2 hours, and the continuous working time of the booster pump in one day is 3 hours.

[0153] Optionally, if the torque current is greater than or equal to the current threshold and the continuous working time of the boost pump is greater than a preset time, indicating that there is a greater risk of wear of the boost pump, the motor is controlled to reduce the speed until the torque current of the motor is less than the current threshold, so that the pressure value of the maximum operating point of the boost pump is less than the pressure threshold, thereby avoiding wear of the boost pump head; if a pressure relief valve is provided inside the boost pump, the number of times the pressure relief valve is triggered to open can be reduced to reduce the wear of the pressure relief valve.

[0154] Optionally, the motor speed is reduced according to a preset third speed control, that is, the current speed of the motor is reduced by a third speed until the torque current is less than a current threshold, so that the pressure value of the maximum operating point of the pump head of the boost pump is rapidly reduced to avoid wear of the pump head of the boost pump; if a pressure relief valve is provided inside the boost pump, the number of times the pressure relief valve is triggered to open can be reduced to reduce the wear of the pressure relief valve.

[0155] Optionally, if the torque current is greater than or equal to the current threshold, and the continuous working time of the boost pump is less than or equal to the preset time, indicating that there is a risk of wear of the boost pump, the motor is controlled to decrease until the torque current of the motor is equal to the current threshold, so that the pressure value of the maximum working point of the boost pump is equal to the pressure threshold, while ensuring the working efficiency of the boost pump, the wear of the pump head of the boost pump is avoided; if a pressure relief valve is provided inside the boost pump, the number of times the pressure relief valve is triggered to open can be reduced to reduce the wear of the pressure relief valve.

[0156] Optionally, the motor is controlled to reduce its speed according to a preset fourth speed, that is, the current speed of the motor is reduced by a fourth speed until the torque current is equal to the current threshold, wherein the fourth speed is less than the third speed, so that the pressure value of the maximum operating point of the pump head of the boost pump is equal to the pressure threshold, while ensuring the working efficiency of the boost pump and avoiding wear of the pump head of the boost pump; if a pressure relief valve is provided inside the boost pump, the number of times the pressure relief valve is triggered to open can be reduced to reduce the wear of the pressure relief valve.

[0157] In the technical solution of the present embodiment, the motor is controlled to reduce its speed by the continuous working time of the motor, that is, the speed of the motor is adjusted according to the working condition of the boost pump, and the motor is controlled to reduce its speed so that the pressure value of the maximum working point of the boost pump is less than or equal to the pressure threshold, thereby avoiding further increase in the pressure value of the maximum working point of the boost pump and reducing the wear of the boost pump head.

[0158] Reference Figure 6 , Figure 6 This is a fifth embodiment of the control method of the booster pump of the present invention, based on any one of the first to fourth embodiments, the step S30 includes:

[0159] Step S36, determining the reduction amount of the motor speed according to the difference between the torque current and the current threshold;

[0160] Step S37, controlling the motor to reduce the speed according to the reduction amount;

[0161] Step S38, returning to the step of obtaining the working current of the motor until the torque current is less than or equal to the current threshold.

[0162] Optionally, the greater the difference between the torque current and the current threshold, the greater the determined reduction in the motor speed; and the smaller the difference between the torque current and the current threshold, the smaller the determined reduction in the motor speed.

[0163] Optionally, in order to avoid a large difference between the torque current output by the motor and the current threshold during a single adjustment of the motor, the motor is controlled to gradually reduce its speed according to the reduction amount. After each time the motor is controlled to gradually reduce its speed according to the reduction amount, it is necessary to return to execute steps S10 to S30 until the torque current of the motor is less than or equal to the current threshold, so that the pressure value of the maximum operating point of the pump head of the boost pump is less than or equal to the pressure threshold, thereby avoiding wear of the pump head of the boost pump; if a pressure relief valve is provided inside the boost pump, the number of times the pressure relief valve is triggered to open can be reduced to reduce the wear of the pressure relief valve.

[0164] In the technical solution of this embodiment, the motor is controlled to reduce the speed through the difference between the torque current and the current threshold so that the pressure value of the maximum operating point of the boost pump is less than or equal to the pressure threshold, thereby avoiding further increase in the pressure value of the maximum operating point of the boost pump and reducing the wear of the boost pump head.

[0165] The present invention also provides a control device for a boost pump, which includes a memory, a processor, and a control program for the boost pump stored in the memory and executable on the processor. When the control program for the boost pump is executed by the processor, the various steps of the control method for the boost pump described in the above embodiment are implemented.

[0166] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a control program for a booster pump, and when the control program for the booster pump is executed by a processor, the various steps of the control method for the booster pump described in the above embodiment are implemented.

[0167] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0168] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, system, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, system, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, system, article or device including the element.

[0169] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment system can be implemented by means of software plus a necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a computer-readable storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a parking management device, an air conditioner, or a network device, etc.) to execute the system described in each embodiment of the present invention.

[0170] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling a booster pump, characterized in that: The control method of the booster pump comprises: Get the working current of the motor; Determining the torque current of the motor according to the working current; If the torque current is greater than the current threshold, the motor is controlled to reduce the rotation speed.

2. The method for controlling a booster pump according to claim 1, wherein: Before the step of controlling the motor to reduce the speed if the torque current is greater than the current threshold, the method further includes: Get the pressure value corresponding to the maximum working point of the booster pump; Determining a pressure threshold according to the pressure value and a preset ratio; The current threshold is determined according to the pressure threshold and a preset coefficient.

3. The control method of the booster pump according to claim 2, characterized in that: Before the step of determining the current threshold according to the pressure threshold and the preset coefficient, the step further includes: Determining a torque coefficient according to the corresponding relationship between the torque current and the motor torque; Determining a pressure coefficient according to a correspondence between the motor torque and the pressure value of the maximum pressure point; A preset coefficient is determined according to the product of the torque coefficient and the pressure coefficient.

4. The method for controlling a booster pump according to claim 1, characterized in that: The step of controlling the motor to reduce the rotation speed comprises: Determining the frequency at which the torque current of the motor is greater than the current threshold; If the frequency is greater than the preset frequency, the motor is controlled to reduce the speed according to the preset first speed; If the frequency is less than or equal to the preset frequency, the motor is controlled to reduce the speed according to the preset second speed; the first speed is greater than the second speed.

5. The method for controlling a booster pump according to claim 1, characterized in that: The step of controlling the motor to reduce the rotation speed comprises: If the continuous working time of the boost pump is longer than the preset time, the motor is controlled to reduce the speed until the torque current is less than the current threshold; If the continuous working time of the boost pump is less than or equal to the preset time, the motor is controlled to reduce the rotation speed until the torque current is equal to the current threshold.

6. The method for controlling a booster pump according to claim 1, characterized in that: The step of controlling the motor to reduce the rotation speed comprises: Determining a reduction amount of the motor speed according to a difference between the torque current and the current threshold; Controlling the motor to gradually reduce the rotation speed according to the reduction amount; Return to the step of obtaining the working current of the motor until the torque current is less than or equal to the current threshold.

7. The method for controlling a booster pump according to claim 1, characterized in that: After the step of determining the torque current of the motor according to the working current, the method further includes: If the torque current is less than or equal to the current threshold and after the preset cycle condition is met, return to the step of obtaining the working current of the motor; Wherein, satisfying the preset cycle condition includes at least one of the following: The operating time of the boost pump is greater than a preset time threshold; The increase in the load of the boost pump is greater than a preset load threshold.

8. The method for controlling a booster pump according to claim 1, characterized in that: The step of determining the torque current of the motor according to the working current comprises: When the working current is a three-phase current, the three-phase current is converted into the torque current according to a preset Clarke transformation and a preset Park transformation; When the working current is a direct current, the torque current is determined to be the direct current.

9. A control device for a booster pump, characterized in that: The control device of the boost pump includes a memory, a processor, and a control program of the boost pump stored in the memory and executable on the processor. When the control program of the boost pump is executed by the processor, the various steps of the control method of the boost pump as described in any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a control program for a booster pump, and when the control program for the booster pump is executed by a processor, each step of the method for controlling a booster pump according to any one of claims 1 to 8 is implemented.

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