CN114645839A - Electric pump and method for protecting electric pump - Google Patents
Electric pump and method for protecting electric pump Download PDFInfo
- Publication number
- CN114645839A CN114645839A CN202011506755.0A CN202011506755A CN114645839A CN 114645839 A CN114645839 A CN 114645839A CN 202011506755 A CN202011506755 A CN 202011506755A CN 114645839 A CN114645839 A CN 114645839A
- Authority
- CN
- China
- Prior art keywords
- electric pump
- temperature value
- power
- preset
- rotating speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005070 sampling Methods 0.000 description 21
- KTXUOWUHFLBZPW-UHFFFAOYSA-N 1-chloro-3-(3-chlorophenyl)benzene Chemical compound ClC1=CC=CC(C=2C=C(Cl)C=CC=2)=C1 KTXUOWUHFLBZPW-UHFFFAOYSA-N 0.000 description 16
- 238000010586 diagram Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The application relates to an electric pump and a protection method of the electric pump, wherein the electric pump comprises a PCB board and an MCU arranged on the PCB board; the MCU acquires a temperature value of the PCB; when the temperature value is greater than or equal to a first preset temperature value, the MCU configures first preset power as electric pump protection power; under the condition that the temperature value is smaller than the first preset temperature value, the MCU configures second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power, the problem that the service life of the electric pump is shortened due to long-time high-power operation is solved, and the service life of the electric pump is maintained.
Description
Technical Field
The present disclosure relates to the field of electric drives, and more particularly, to an electric pump and a method for protecting the electric pump.
Background
When the electric pump runs for a long time at high power, the temperature of a PCB of the electric pump can be increased, the service life of each electronic component on the PCB is related to the temperature, the service life of the electronic components can be influenced by the long-time high-power running of the electric pump, and the service life of the electric pump is shortened.
Aiming at the problem that the service life of the electric pump is shortened due to long-time high-power operation in the related art, an effective solution is not provided.
Disclosure of Invention
The invention aims to provide an electric pump and a protection method of the electric pump, which are beneficial to maintaining the service life of the electric pump.
In order to realize the purpose, the invention adopts the following technical scheme:
an electric pump comprises a PCB board and an MCU arranged on the PCB board;
the MCU acquires a temperature value of the PCB;
when the temperature value is larger than or equal to a first preset temperature value, the MCU configures first preset power as electric pump protection power;
and under the condition that the temperature value is smaller than the first preset temperature value, the MCU configures second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power.
The invention also discloses a method for protecting the electric pump, which comprises the following steps:
acquiring a temperature value of a PCB arranged in the electric pump;
configuring first preset power as electric pump protection power under the condition that the temperature value is greater than or equal to a first preset temperature value;
and under the condition that the temperature value is smaller than the first preset temperature value, configuring second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power.
The temperature value of the PCB is obtained through the MCU; when the temperature value is greater than or equal to a first preset temperature value, the MCU configures first preset power as electric pump protection power; and under the condition that the temperature value is smaller than the first preset temperature value, the MCU configures second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power, so that the problem of service life shortening of the electric pump caused by long-time high-power operation is solved, and the service life of the electric pump is favorably maintained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic view of the internal structure of an electric pump according to an embodiment of the present application;
fig. 2 is a schematic view of a control principle of an electric pump according to the related art;
FIG. 3 is a flow chart of a method of protecting an electric pump according to an embodiment of the present application;
FIG. 4 is a graph illustrating the relationship between the ambient temperature and the protection power of a sampling resistor according to an embodiment of the present application;
FIG. 5 is a diagram illustrating the relationship between the temperature of a PCB and the protection current of a sampling resistor according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating analysis of a relationship between a temperature of a PCB and a protection current of a sampling resistor according to an embodiment of the present application;
FIG. 7 is a flow chart of a method of protecting an electric pump according to another embodiment of the present application;
FIG. 8 is a schematic diagram of the control principles of an electric pump according to an embodiment of the present application;
FIG. 9 is a block diagram of system operation of a protection module according to an embodiment of the present application;
FIG. 10 is a block diagram of system operation of a power comparison module according to an embodiment of the present application;
FIG. 11 is a flow diagram of the operation of a protection module according to an embodiment of the present application;
fig. 12 is a block diagram of a structure of an electric pump and a host computer interaction system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application.
It is obvious that the drawings in the following description are only examples or embodiments of the application, and that it is also possible for a person skilled in the art to apply the application to other similar contexts on the basis of these drawings without inventive effort. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by one of ordinary skill in the art that the embodiments described herein may be combined with other embodiments without conflict.
Unless otherwise defined, technical or scientific terms referred to herein should have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (including a single reference) are to be construed in a non-limiting sense as indicating either the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
The present application provides an electric pump, which can be applied to a product such as a vehicle air conditioning system and a cooling system, etc. using cooling liquid such as water or oil as a circulating medium, fig. 1 is a schematic diagram of an internal structure of the electric pump according to an embodiment of the present application, and as shown in fig. 1, the electric pump 10 includes a PCB 11, an MCU12 disposed on the PCB 11, and a motor 13 electrically connected to the MCU 12; the MCU12 obtains the temperature value of the PCB 11; when the temperature value is greater than or equal to a first preset temperature value, the MCU12 configures a first preset power as the electric pump protection power; under the condition that the temperature value is smaller than the first preset temperature value, the MCU12 configures second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power; by comparing the magnitudes of the electric pump actual power and the electric pump protection power, in the case where the electric pump actual power is greater than the electric pump protection power, the MCU12 determines a first target rotational speed and instructs to set the rotational speed of the motor 13 to the first target rotational speed.
Fig. 2 is a schematic diagram illustrating a control principle of an electric pump according to the related art, in the entire control system shown in fig. 2, the control system includes a rotational speed PI controller and a current PI controller, wherein the rotational speed PI controller is used as an outer ring of the control system, and the target current of the output bus is controlled by a difference between an actual rotational speed fed back by the control motor 13 and a target rotational speed given by the upper computer; the current PI controller is used as an inner ring of the control system, and the output torque of the motor 13 is controlled by controlling the difference value of the feedback current of the bus and the target current of the bus given by the upper computer; under the condition that the target rotating speed given by the upper computer input by the whole system is overlarge and the load is large, the torque of the motor 13 output by the whole system is large, so that the electric pump 10 runs at high power (namely, is overloaded), and the service life of the electric pump 10 is further shortened.
The present embodiment also provides a method for protecting an electric pump 10, which is used to implement the above-mentioned embodiment, fig. 3 is a flowchart of a method for protecting an electric pump according to an embodiment of the present application, and as shown in fig. 3, the flowchart includes the following steps:
step S301, acquiring a temperature value of the PCB 11 disposed in the electric pump 10;
step S302, configuring a first preset power as the electric pump protection power under the condition that the temperature value is greater than or equal to a first preset temperature value;
and under the condition that the temperature value is smaller than the first preset temperature value, configuring second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power.
For example, the electric pump 10 with a rated power of 50W is selected to perform the operation description of the method, and table 1 is a protection current parameter table of each component in the 50W electric pump 10 under different environmental temperatures:
TABLE 1
As can be seen from table 1, in the junction temperature range of each component in table 1, the lower ambient temperature of-40 ℃ and the higher ambient temperature of 125 ℃ are selected for comprehensive consideration: when the ambient temperature is-40 ℃, the minimum protection current of each component in table 1 is 8A, and when the ambient temperature is 125 ℃, the minimum protection current of each component in table 1 is 6.6A, where the protection current is the maximum allowable current of the component at the ambient temperature, and therefore, a sampling resistor corresponding to the 6.6A protection current is selected as the limiting component, and since the protection current of the sampling resistor is minimum, the service lives of other components are not affected under the condition that the service life of the sampling resistor is not affected, the protection current of the sampling resistor at different ambient temperatures can be analyzed to define the protection current of the electric pump 10.
It should be noted that table 1 only lists 3 components, which are only schematic and non-limiting, and in actual operation, all components of the electric pump 10 need to be considered.
Fig. 4 is a schematic diagram of a relationship between an ambient Temperature and a protection power of a sampling resistor according to an embodiment of the present application, where Pe is a rated power of the sampling resistor, where the protection power is a maximum allowable power of the sampling resistor at the ambient Temperature, where the ambient Temperature may be a Temperature of a PCB 11 where the sampling resistor is located, a square of a protection current value of the sampling resistor is known to be proportional to a protection power value of the sampling resistor, and a relationship curve of the ambient Temperature and the protection power of the sampling resistor in fig. 4 may be obtained as shown in fig. 5, where fig. 5 is a schematic diagram of a relationship between a Temperature of the PCB and a protection current of the sampling resistor according to an embodiment of the present application, as shown in fig. 5, when a Temperature (PCB Temperature, abbreviated as TPCB) of the PCB 11 is 70 ℃, a performance of the sampling resistor starts to significantly decrease, and therefore, 70 ℃ is selected as the first preset Temperature value, configuring a first preset power as an electric pump protection power under the condition that TPCB is greater than or equal to 70 ℃; and under the condition that the TPCB is less than 70 ℃, configuring a second preset power as the electric pump protection power, wherein the first preset power is less than the second preset power.
In this embodiment, the first predetermined power value is selected according to the following method: as can be seen from the graph shown in fig. 5, after the TPCB value of 70 ℃ is reached, the protection current value of the sampling resistor decreases with the increase of the TPCB value, and it is known that the over-temperature protection of the PCB 11 is triggered when the TPCB value of the electric pump 10 exceeds 137 ℃, therefore, fig. 6 is a schematic diagram for analyzing the relationship between the temperature of the PCB and the protection current of the sampling resistor according to the embodiment of the present application, and as shown in fig. 6, the TPCB value for triggering the over-temperature protection of the PCB 11 is defined as T0Definition of and T0Corresponding protection current value is I0It may be chosen to be slightly lower than I as shown in FIG. 60Current value of1As opposed to a first predetermined power in the methodThe protection current value is required, so that the protection current value I is ensured before the over-temperature protection of the PCB 11 is triggered1A protection current value smaller than any temperature value in all temperature regions of the TPCB provides stable protection for the electric pump 10, as can be seen from fig. 6, I1Is 5.5A; in the case where the power supply voltage of the electric pump 10 is 12V, since the protection current of the sampling resistor is equal to the protection current of the electric pump 10, and the first preset power of the electric pump 10 is the product of the protection current of the electric pump 10 and the power supply voltage, the first preset power of the electric pump 10 is 66W, and the 50W electric pump operating point power in the known related art is 63W, so that the first preset power is set to 66W, which can completely satisfy the normal operation of the 50W electric pump.
The second predetermined power value may be selected according to the following method: since the first preset power of the electric pump 10 is 66W, it can be seen from the graph shown in fig. 6 that the protection current of the sampling resistor before the TPCB value of 70 ℃ is larger than the protection current after the TPCB value of 70 ℃, so that the second preset power is set larger than the first preset power, and meanwhile, considering that when the temperature of the coolant of the electric pump 10 is low, the electric pump 10 needs to ensure a sufficient starting power to start normally, the protection current value I corresponding to the second preset power can be set2Setting to be 6A; since the magnitude of the protection current of the sampling resistor is equal to the magnitude of the protection current of the electric pump 10, and the second preset power of the electric pump 10 is the product of the protection current of the electric pump 10 and the power supply voltage, the second preset power of the electric pump 10 is 72W.
Through the above steps S301 to S302, compared to the problem that when the electric pump 10 in the prior art runs at a high power for a long time, the temperature of the PCB 11 of the electric pump 10 will increase, and the lifetime of each electronic component on the PCB 11 is related to the temperature, and the lifetime of the electronic components will be affected by the too high temperature of the electric pump 10, which further shortens the lifetime of the electric pump 10, in this embodiment, the temperature value of the PCB 11 disposed in the electric pump 10 is obtained; when the temperature value is greater than or equal to a first preset temperature value, configuring first preset power as electric pump protection power; under the condition that the temperature value is smaller than the first preset temperature value, second preset power is configured to serve as electric pump protection power, wherein the first preset power is smaller than the second preset power, the electric pump 10 is prevented from still running at high power when the temperature is too high, the problem that the service life of the electric pump 10 is shortened due to long-time high-power running is solved, and the service life of the electric pump 10 is maintained.
In some of these embodiments, fig. 7 is a flow chart of a method of protecting an electric pump according to another embodiment of the present application, as shown in fig. 7, comprising the steps of:
step S701, acquiring a Temperature value of the PCB 11 disposed in the electric pump 10, for example, acquiring a Temperature value of the PCB 11 disposed in the electric pump 10 by performing Temperature acquisition through a Negative Temperature Coefficient (NTC) material;
step S702, configuring a first preset power as the electric pump protection power under the condition that the temperature value is greater than or equal to a first preset temperature value;
configuring a second preset power as the electric pump protection power under the condition that the temperature value is less than or equal to a second preset temperature value;
when the temperature value is in a hysteresis zone which is larger than the second preset temperature value and smaller than the first preset temperature value, and if the temperature value rises to the hysteresis zone from the second preset temperature value or smaller, configuring the second preset power as the electric pump protection power;
when the temperature value is in a hysteresis area which is larger than the second preset temperature value and smaller than the first preset temperature value, and if the temperature value is reduced to the hysteresis area from the first preset temperature value or larger, the first preset power is configured to be used as electric pump protection power, wherein the first preset temperature value is larger than the second preset temperature value.
Through the above steps S701 to S702, since the maximum error of the NCT temperature acquisition is 4 ℃, in this embodiment, a hysteresis margin of 10 ℃ may be set, and when the acquired temperature value is smaller than the first preset temperature value but is within the hysteresis region, and the temperature value is decreased from being greater than or equal to the first preset temperature value to being within the hysteresis region, the first preset power is still configured as the electric pump protection power, so as to avoid that the electric pump 10 is overloaded to operate due to the fact that the second preset power is mistakenly used as the electric pump protection power under the actual condition that the temperature value is greater than or equal to the first preset temperature value because of the temperature acquisition error.
Fig. 8 is a schematic diagram of a control principle of an electric pump according to an embodiment of the present application, and as shown in fig. 8, a protection module is added before the whole control system shown in fig. 2, by adding the protection module, the operation condition of the electric pump 10 can be detected in time, and a safe first target rotation speed is provided for the electric pump 10 when the condition of high-power operation occurs to the electric pump 10, so that a reduction in the lifetime of the electric pump 10 due to long-time high-power operation is avoided, and it is beneficial to maintain the lifetime of the electric pump 10.
Fig. 9 is a system operation block diagram of a protection module according to an embodiment of the present application, where as shown in fig. 9, the protection module includes a first enabling module, a first processing module, and a first quitting module, and the protection module continuously detects whether the electric pump 10 is overloaded by polling, and processes the electric pump 10 when the electric pump 10 is overloaded.
The first enabling module comprises a power comparison module, fig. 10 is a system operation block diagram of the power comparison module according to the embodiment of the present application, and as shown in fig. 10, in the power comparison module, the protection power of the electric pump is selected according to the temperature collected by the NTC, and the actual power of the electric pump is obtained according to the product of the bus current value and the bus voltage value of the motor; outputting a power difference e (t) between the actual power of the electric pump and the protective power of the electric pump through a comparator in a power comparison module;
continuing to refer to fig. 9, in the first enabling module, after the power comparing module outputs the power difference e (t), it is determined whether the power difference e (t) is greater than 0, and in the case that the power difference e (t) is greater than 0, in the first processing module, a first target rotation speed is determined, for example, the first processing module includes a power PI controller, the power PI controller outputs the first target rotation speed according to the input power difference e (t), and for example, a relationship between the power difference e (t) and the first target rotation speed is obtained and stored in advance through experimental data, a database is formulated, and when the first target rotation speed is determined, the database is called to obtain the first target rotation speed corresponding to the power difference e (t);
sending a rotation speed instruction to the motor 13 provided in the electric pump 10, wherein the rotation speed instruction instructs to set the rotation speed of the motor 13 to the first target rotation speed, for example, in the case that the power difference e (t) is greater than 0, a first enabling module enables a first flag bit, a first processing module determines the first target rotation speed, and sends a rotation speed instruction to the motor 13 provided in the electric pump 10, wherein the rotation speed instruction instructs to set the rotation speed of the motor 13 to the first target rotation speed;
in the first exit module, after the first target rotation speed is processed by the filter, the first target rotation speed is compared with a target rotation speed given by the upper computer, and when the first target rotation speed is greater than the target rotation speed given by the upper computer, a rotation speed instruction is sent to the motor 13, where the rotation speed instruction instructs to set the rotation speed of the motor 13 as the target rotation speed given by the upper computer, for example, when the first target rotation speed is greater than the target rotation speed given by the upper computer, the first exit module closes the first flag bit and sends a rotation speed instruction to the motor 13, where the rotation speed instruction instructs to set the rotation speed of the motor 13 as the target rotation speed given by the upper computer.
Through the cooperation of first enabling module, first processing module and the first module of withdrawing from, motor 13 when transshipping, according to the operation of first target rotational speed, has avoided PCB board 11 to cause the high temperature because motor 13 high-power operation for a long time, leads to spare part life-span to shorten, and then leads to this PCB board 11 life-span to shorten, is favorable to maintaining electric pump 10 life-span.
Fig. 11 is an operation flowchart of the protection module according to the embodiment of the present application, as shown in fig. 11, when the power difference e (t) is greater than 0, the first flag bit becomes an enabled state, at this time, the first enabling module no longer operates, only the first processing module operates in the program cycle period, the power PI controller obtains the first target rotation speed according to the power difference e (t), the motor 13 operates according to the first target rotation speed when the first target rotation speed is less than or equal to the target rotation speed given by the upper computer, and the first exit module exits overload and the motor 13 operates according to the target rotation speed given by the upper computer when the first target rotation speed is greater than the target rotation speed given by the upper computer.
Fig. 12 is a block diagram of a structure of an electric pump and host computer interaction system according to an embodiment of the present application, and as shown in fig. 12, the system includes an ECU121, an MCU12, and a motor 13, where the ECU121 is a host computer, and the electric pump 10 controls the operation of the electric pump 10 itself through an input signal of the host computer.
The MCU12 comprises a communication module, a control module, a PWM module and an ADC module, wherein the communication module converts a signal of the ECU121 into a target rotating speed given by an upper computer for controlling the operation of the electric pump, and reports the actual rotating speed and the cooling liquid temperature of the motor 13 and the voltage and current values in the PCB 11 electrically connected with the MCU12 to the ECU 121; the control module processes signals acquired by the ADC, converts the signals into actual current, voltage and temperature, and controls the electric pump to normally operate, and comprises a protection module, a rotating speed module and an electric pump control module, wherein the protection module provides overload protection for the electric pump 10, the rotating speed module selects the rotating speed of the motor 13, the rotating speed of the motor 13 can be derived from the ECU121 (namely the target rotating speed given by the upper computer) or from the protection module (namely the first target rotating speed), and the electric pump control module is responsible for executing a control program of the electric pump 10; the PWM module is used for outputting three-phase sine PWM waves; the ADC module is used to collect current and voltage signals on the PCB 11.
It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The electric pump is characterized by comprising a PCB (printed circuit board) and an MCU (microprogrammed control unit) arranged on the PCB;
the MCU acquires a temperature value of the PCB;
when the temperature value is larger than or equal to a first preset temperature value, the MCU configures first preset power as electric pump protection power;
and under the condition that the temperature value is smaller than the first preset temperature value, the MCU configures second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power.
2. The electric pump of claim 1, wherein the MCU configures the second preset power as an electric pump protection power in case the temperature value is less than or equal to a second preset temperature value; when the temperature value is in a hysteresis zone which is larger than the second preset temperature value and smaller than the first preset temperature value, and if the temperature value rises to the hysteresis zone from the temperature value which is smaller than or equal to the second preset temperature value, the MCU configures the second preset power as the electric pump protection power; when the temperature value is in a hysteresis zone which is larger than the second preset temperature value and smaller than the first preset temperature value, and if the temperature value is reduced to the hysteresis zone from the first preset temperature value which is larger than or equal to the second preset temperature value, the MCU configures the first preset power as the electric pump protection power, wherein the first preset temperature value is larger than the second preset temperature value.
3. The electric pump of claim 1, comprising a motor electrically connected to the MCU, wherein after the MCU selects electric pump protection power:
the MCU determines the actual power of the electric pump, wherein the actual power is proportional to the multiplication of the bus current value and the bus voltage value;
the MCU compares the actual power of the electric pump with the protection power of the electric pump, determines a first target rotating speed and sends a rotating speed instruction to the motor under the condition that the actual power of the electric pump is larger than the protection power of the electric pump, wherein the rotating speed instruction instructs to set the rotating speed of the motor to be the first target rotating speed.
4. The electric pump of claim 3, wherein the MCU includes a PI controller, the MCU determining a first target speed comprising: and the PI controller outputs the first target rotating speed according to the power difference between the input actual power and the electric pump protection power.
5. The electric pump according to claim 3 or 4, characterized in that the MCU enables a first flag in case the electric pump actual power is greater than the electric pump protection power, wherein in the first flag enabled state the motor is operated at the first target rotational speed;
and under the condition that the first target rotating speed is greater than the target rotating speed given by the upper computer, the MCU closes the first zone bit, wherein under the condition that the first zone bit is closed, the motor operates according to the target rotating speed given by the upper computer.
6. A method of protecting an electric pump, the method comprising:
acquiring a temperature value of a PCB arranged in the electric pump;
configuring first preset power as electric pump protection power under the condition that the temperature value is greater than or equal to a first preset temperature value;
and under the condition that the temperature value is smaller than the first preset temperature value, configuring second preset power as electric pump protection power, wherein the first preset power is smaller than the second preset power.
7. The method of claim 6, wherein the method comprises: configuring second preset power as electric pump protection power under the condition that the temperature value is less than or equal to the second preset temperature value; when the temperature value is in a hysteresis zone which is larger than the second preset temperature value and smaller than the first preset temperature value, and if the temperature value rises to the hysteresis zone from the temperature value which is smaller than or equal to the second preset temperature value, configuring the second preset power as the electric pump protection power; when the temperature value is in a hysteresis zone which is larger than the second preset temperature value and smaller than the first preset temperature value, and if the temperature value is reduced to the hysteresis zone from the first preset temperature value which is larger than or equal to the second preset temperature value, the first preset power is configured to be used as electric pump protection power, wherein the first preset temperature value is larger than the second preset temperature value.
8. The method of claim 6, wherein after said configuring the electric pump protection power, the method comprises:
determining the actual power of the electric pump, wherein the actual power is proportional to the multiplication of the bus current value and the bus voltage value;
comparing the actual power of the electric pump with the protection power of the electric pump, determining a first target rotating speed under the condition that the actual power of the electric pump is larger than the protection power of the electric pump, and sending a rotating speed instruction to a motor arranged in the electric pump, wherein the rotating speed instruction indicates that the rotating speed of the motor is set to be the first target rotating speed.
9. The method of claim 8, wherein the determining a first target rotational speed comprises: and the PI controller arranged in the MCU of the electric pump outputs the first target rotating speed according to the power difference value between the input actual power and the protection power of the electric pump.
10. The method of claim 8 or 9, wherein after configuring the electric pump to protect power, the method comprises:
enabling a first zone bit under the condition that the actual power of the electric pump is greater than the protection power of the electric pump, wherein the motor operates according to the first target rotating speed under the enabled state of the first zone bit;
and closing the first zone bit under the condition that the first target rotating speed is greater than the target rotating speed given by the upper computer, wherein the motor operates according to the target rotating speed given by the upper computer under the condition that the first zone bit is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011506755.0A CN114645839A (en) | 2020-12-18 | 2020-12-18 | Electric pump and method for protecting electric pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011506755.0A CN114645839A (en) | 2020-12-18 | 2020-12-18 | Electric pump and method for protecting electric pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114645839A true CN114645839A (en) | 2022-06-21 |
Family
ID=81990176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011506755.0A Pending CN114645839A (en) | 2020-12-18 | 2020-12-18 | Electric pump and method for protecting electric pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114645839A (en) |
-
2020
- 2020-12-18 CN CN202011506755.0A patent/CN114645839A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106080173B (en) | Control method, device and the electric car of electric automobile cooling system | |
| EP2028759B1 (en) | Method and apparatus for controlling electric motor | |
| US9030143B2 (en) | Method and system of limiting current to a motor | |
| EP2752988B1 (en) | Thermal protection method and system to maximize availability of electric drive system | |
| CN104094519B (en) | System and method of the temperature to control its supply of electric power based on electrically powered machine | |
| CN108151134A (en) | Heating equipment control method, device and heating equipment | |
| CN112503734A (en) | Temperature control method and device of air conditioner, storage medium and processor | |
| KR102563477B1 (en) | Apparatus and Method for measuring temperature of relay | |
| US11043830B2 (en) | Vehicle and electric power control device for vehicle | |
| CN111114378A (en) | Power battery current control method and device | |
| US8628310B2 (en) | Fan system having improved availability and method for its operation | |
| CN113677164A (en) | Heat dissipation control method and device of electric control box and air conditioner | |
| EP4296482A1 (en) | Vehicle and thermal management control method and device therefor, and storage medium | |
| CN114645839A (en) | Electric pump and method for protecting electric pump | |
| EP2829431A2 (en) | Abnormality detection device | |
| US10100800B2 (en) | Cold start feature for vehicle electronic pump | |
| EP3916516A2 (en) | Thermal management method for multiple heat sources and wireless communication apparatus having multiple heat sources | |
| CN111885892B (en) | Heat dissipation control method, system and equipment of power adapter and readable storage medium | |
| CN112172527B (en) | IGBT temperature protection frequency conversion control method for electric automobile | |
| CN111478646B (en) | Temperature protection method and system for motor system of electric vehicle, electric vehicle and storage medium | |
| CN105818690A (en) | High-voltage power distribution device and control method | |
| RU2695938C2 (en) | Current supply control method in multifunctional systems | |
| WO2023039808A1 (en) | Method and apparatus for over-temperature protection on power device of electric motor controller | |
| CN109560746B (en) | Overload protection method and device for electric vehicle driving system | |
| CN107000662B (en) | Method for controlling an electrical load of a low-voltage on-board electrical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |