CN115663243A - Electric pump control method and device of battery system - Google Patents
Electric pump control method and device of battery system Download PDFInfo
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- CN115663243A CN115663243A CN202211398408.XA CN202211398408A CN115663243A CN 115663243 A CN115663243 A CN 115663243A CN 202211398408 A CN202211398408 A CN 202211398408A CN 115663243 A CN115663243 A CN 115663243A
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Abstract
The invention discloses an electric pump control method and device of a battery system. The electric pump control method of the battery system provided by the embodiment of the invention is applied to the battery system, the battery system comprises an electric pile and a temperature adjusting device, the temperature adjusting device comprises an electric pump and a cooling pipeline, and cooling liquid flows through the cooling pipeline; the method comprises the following steps: acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid; determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid; acquiring temperature information of cooling liquid entering and flowing out of the galvanic pile; and determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information so as to regulate the rotation speed of the electric pump. According to the technical scheme of the embodiment of the invention, the control precision of the fuel cell water pump is improved by adjusting the rotating speed of the electric pump, the service life of the fuel cell stack is prolonged, and the working efficiency of the stack is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an electric pump control method and device of a battery system.
Background
The hydrogen fuel cell automobile has the advantages of environmental protection, short hydrogenation time, long endurance and the like. Compared with the traditional fuel engine, most of heat of the hydrogen fuel cell engine needs to be taken away through cooling liquid, the traditional fuel engine needs less heat taken away by the cooling liquid, meanwhile, the hydrogen fuel cell has lower working temperature and narrow effective working temperature range, and the temperature difference between the cooling liquid in a radiator and the environment is smaller than that of the traditional engine, so that very serious challenge is brought to the heat management of the traditional engine. The existing water pump control method of the fuel cell generally adopts an open-loop control method, and has the problems of poor control effect, great influence on the working efficiency of a galvanic pile and serious influence on the service life of the fuel cell.
Disclosure of Invention
The invention provides an electric pump control method and device of a battery system, which aim to solve the problems that the control effect of the existing water pump is poor, the working efficiency of a galvanic pile is influenced, and the service life of a fuel battery is prolonged.
According to an aspect of the present invention, there is provided an electric pump control method for a battery system, which is applied to the battery system, the battery system including a stack and a temperature adjustment device, the temperature adjustment device including an electric pump and a cooling pipeline, a cooling fluid flowing through the cooling pipeline, the method including:
acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid;
determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid;
acquiring temperature information of cooling liquid entering and flowing out of the galvanic pile;
and determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information so as to adjust the rotation speed of the electric pump.
Optionally, obtaining temperature information of the cooling liquid entering and exiting the electric pile includes:
acquiring first temperature information of cooling liquid entering the galvanic pile;
and acquiring second temperature information of the cooling liquid flowing out of the galvanic pile.
Optionally, determining a basic rotation speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the coolant, including:
calculating heat generation information of the battery according to the target power generation information;
calculating flow demand information of the cooling liquid according to the heating value information and the heat transfer efficiency value of the cooling liquid;
and determining a basic rotating speed value of the electric pump according to the flow demand information.
Optionally, the target power generation information includes a calorific value of hydrogen, an average voltage of a battery, a current of a stack, and the number of cells of the stack;
the calculating the heat generation amount information of the battery according to the target power generation information comprises the following steps:
the calorific value information of the battery is calculated by adopting the following formula:
K＝(eHV–ecell)×I×N/1000 (1)
wherein K is the heat (kilowatt) produced by the galvanic pile, eHV is the heat value of hydrogen, ecell is the average voltage of the cell, I is the current of the galvanic pile, and N is the number of single cells of the galvanic pile.
Optionally, determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information, so as to adjust the rotation speed of the electric pump, including:
calculating the temperature difference value of the cooling liquid entering and exiting the galvanic pile under the current working condition according to the first temperature information and the second temperature information;
determining a PID gain value of the rotation speed of the electric pump according to the temperature difference value of the cooling liquid, the basic rotation speed value of the electric pump and the target temperature difference value;
and adjusting the rotating speed of the electric pump according to the PID gain value of the rotating speed of the electric pump and the basic rotating speed value of the electric pump.
Optionally, the target temperature difference value is determined by the following method:
and acquiring historical temperature difference data, and acquiring a target temperature difference value of the reactor entering and exiting under the current working condition according to the historical temperature difference data.
Optionally, determining a PID gain value of the rotation speed of the electric pump according to the temperature difference of the cooling liquid, the basic rotation speed value of the electric pump, and the target temperature difference value, includes:
determining PID gain data of the flow rate of the cooling liquid output by the electric pump according to the temperature difference value of the cooling liquid and the target temperature difference value;
and determining the PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the PID gain data of the flow of the cooling liquid output by the electric pump.
Optionally, determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and PID gain data of the flow rate of the cooling liquid output by the electric pump, including:
carrying out proportional calculation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Kp;
performing integral operation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Ki;
and carrying out differential calculation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Kd.
Optionally, adjusting the rotation speed of the electric pump according to the PID gain value of the rotation speed of the electric pump and the basic rotation speed value of the electric pump includes:
adding the basic rotating speed value of the electric pump and the PID gain value of the rotating speed of the electric pump, and obtaining a set value of the rotating speed of the electric pump based on the safety protection limit value of the rotating speed of the electric pump;
and controlling the electric pump to operate at the set value of the rotation speed of the electric pump.
In a second aspect, an embodiment of the present invention provides an electric pump control device for a battery system, which is applied to the battery system, where the battery system includes an electric stack and a temperature adjustment device, where the temperature adjustment device includes an electric pump and a cooling pipeline, and a cooling fluid flows through the cooling pipeline;
the electric pump control device of the battery system includes:
the first acquisition module is used for acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid;
the calculation module is used for determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid;
the second acquisition module is used for acquiring temperature information of cooling liquid entering and flowing out of the galvanic pile;
and the control and regulation module is used for determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value and the temperature information of the electric pump so as to regulate the rotation speed of the electric pump.
According to the technical scheme of the embodiment of the invention, the basic rotating speed value of the electric pump is determined by acquiring the target power generation information of the battery and the heat transfer efficiency value of the cooling liquid. And acquiring temperature information of cooling liquid entering and flowing out of the galvanic pile, and determining a PID gain value of the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and the temperature information of the cooling liquid so as to regulate the rotating speed of the electric pump. According to the electric pump control method of the battery system, the rotating speed of the electric pump is adjusted by acquiring the target power generation information of the pool, the heat transfer efficiency value of the cooling liquid and the temperature information of the cooling liquid entering and flowing out of the electric pile, so that the control precision of the fuel cell water pump is improved, the service life of the fuel cell electric pile is prolonged, and the working efficiency of the electric pile is improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of an electric pump control method of a battery system according to an embodiment of the present invention;
fig. 2 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention;
fig. 3 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating an electric pump control method of another battery system according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating an electric pump control method of another battery system according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating an electric pump control method for a battery system according to another embodiment of the present invention;
fig. 7 is a flowchart illustrating an electric pump control method of another battery system according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating an electric pump control method of a battery system according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an electric pump control device of a battery system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of an electric pump control method for a battery system according to an embodiment of the present invention. Referring to fig. 1, an electric pump control method for a battery system according to an embodiment of the present invention is applied to a battery system, where the battery system includes an electric stack and a temperature adjustment device, the temperature adjustment device includes an electric pump and a cooling pipeline, and a cooling fluid flows through the cooling pipeline. An electric pump control method of a battery system includes:
s101, acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid.
Specifically, the power generation information of the battery is a parameter that reflects the operating state of the battery, such as the current, voltage, and the like of the battery. The state of the cooling fluid affects the heat transfer efficiency, which is different when the cooling fluid is in the vapor state than when the cooling fluid is in the liquid state. The regulation of the speed of the electric pump requires taking into account the effect of the state of the cooling fluid.
S102, determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid.
Specifically, the current rotation speed of the electric pump, that is, the basic rotation speed value of the electric pump, may be determined according to the current target power generation information and the heat transfer efficiency value of the coolant.
And S103, acquiring temperature information of the cooling liquid entering and exiting the galvanic pile.
Specifically, the electric pump is used for inputting cooling liquid into the fuel cell stack to adjust the temperature of the stack, and the rotating speed of the electric pump is required to be adjusted according to the temperature information of the cooling liquid entering and flowing out of the stack so as to accurately adjust the temperature of the stack.
And S104, determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information so as to adjust the rotation speed of the electric pump.
Specifically, according to the basic rotating speed value of the electric pump and the temperature information, a PID gain value of the rotating speed of the electric pump can be determined through PID (proportional-integral-derivative) control, and the rotating speed of the electric pump is adjusted according to the PID gain value. The arrangement can ensure that the regulated rotating speed of the electric pump can accurately regulate the temperature of the electric pile.
In the electric pump control method of the battery system provided in this embodiment, target power generation information of the battery and a heat transfer efficiency value of the coolant are acquired to determine a basic rotation speed value of the electric pump. And acquiring temperature information of cooling liquid entering and flowing out of the galvanic pile, and determining a PID gain value of the rotating speed of the electric pump through PID control according to the basic rotating speed value of the electric pump and the temperature information of the cooling liquid so as to adjust the rotating speed of the electric pump. According to the electric pump control method of the battery system, the rotating speed of the electric pump is adjusted by acquiring the target power generation information of the pool, the heat transfer efficiency value of the cooling liquid and the temperature information of the cooling liquid entering and flowing out of the electric pile, so that the control precision of the fuel cell water pump is improved, the service life of the fuel cell electric pile is prolonged, and the working efficiency of the electric pile is improved.
Optionally, fig. 2 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the electric pump control method of the battery system includes:
s101, acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid.
And S102, determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid.
S201, acquiring first temperature information of cooling liquid entering the galvanic pile.
Specifically, the first temperature information is temperature information of a coolant that is electrically pumped into a stack of the fuel cell.
S202, obtaining second temperature information of the cooling liquid flowing out of the galvanic pile.
Specifically, the second temperature information is temperature information of the coolant flowing out of the stack of the fuel cell.
And S104, determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information so as to adjust the rotation speed of the electric pump.
Optionally, fig. 3 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 3, the electric pump control method of the battery system provided in this embodiment includes:
s101, acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid.
And S301, calculating heat generation amount information of the battery according to the target power generation information.
Specifically, the heating value information of the cell is the heat generated by the fuel cell stack during operation, and can be calculated according to the acquired power generation information.
S302, calculating flow demand information of the cooling liquid according to the heating value information and the heat transfer efficiency value of the cooling liquid.
Specifically, the heat transfer efficiency value of the coolant is a value reflecting the heat dissipation capacity of the coolant, and the flow demand information of the coolant is a value reflecting the demand of the fuel cell stack on the coolant. And calculating the flow demand information of the cooling liquid according to the heating value information and the heat transfer efficiency value of the cooling liquid.
And S303, determining a basic rotating speed value of the electric pump according to the flow demand information.
Specifically, the electric pump works according to the requirement of the galvanic pile on the cooling liquid under the current condition, and the rotating speed working according to the flow demand information is the basic rotating speed value. The cooling liquid flows into the electric pile through the electric pump, and the basic rotating speed value of the electric pump can be determined through the flow demand information.
And S103, acquiring temperature information of the cooling liquid entering and exiting the galvanic pile.
And S104, determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information so as to adjust the rotation speed of the electric pump.
Optionally, the target power generation information includes a heat value of hydrogen, an average voltage of the cell, a current of the stack, and the number of cells of the stack.
The heat generation amount information of the battery can be calculated by adopting the following formula:
K＝(eHV–ecell) ×I×N/1000 (1)
wherein K is the heat (kilowatt) produced by the galvanic pile, eHV is the heat value of hydrogen, ecell is the average voltage of the cell, I is the current of the galvanic pile, and N is the number of single cells of the galvanic pile.
Specifically, the heat value information of the cell can be calculated according to the heat value of the hydrogen, the average voltage of the cell, the current of the cell stack and the number of the single cells of the cell stack, and the formula (1) can be understood as that the difference between the heat value of the hydrogen and the average voltage of the cell is multiplied by the current of the cell stack and then multiplied by the number of the single cells of the cell stack to be divided by 1000, namely the heat generation amount of the cell stack.
Alternatively, fig. 4 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention. On the basis of the foregoing embodiment, referring to fig. 4, the electric pump control method for a battery system provided in this embodiment includes:
s101, acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid.
S102, determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid.
S201, acquiring first temperature information of cooling liquid entering the galvanic pile.
S202, obtaining second temperature information of the cooling liquid flowing out of the galvanic pile.
S401, calculating the temperature difference value of the cooling liquid entering and exiting the galvanic pile under the current working condition according to the first temperature information and the second temperature information.
Specifically, the first temperature information of the cooling liquid entering the stack and the second temperature information of the cooling liquid flowing out of the stack may be subtracted, and the obtained difference value is the temperature difference value of the cooling liquid.
S402, determining a PID gain value of the rotation speed of the electric pump according to the temperature difference value of the cooling liquid, the basic rotation speed value of the electric pump and the target temperature difference value.
Specifically, the PID algorithm is a control algorithm combining three links of proportion, integral and differential into a whole. The target temperature difference value is the optimal temperature difference value of the electric pile in and out, and the PID gain value of the rotating speed of the electric pump can be determined according to the temperature difference value of the cooling liquid, the basic rotating speed value of the electric pump and the target temperature difference value through the PID algorithm.
And S403, adjusting the rotating speed of the electric pump according to the PID gain value of the rotating speed of the electric pump and the basic rotating speed value of the electric pump.
Specifically, the basic rotating speed value of the current electric pump is corrected through the PID gain value of the rotating speed of the electric pump, so that the rotating speed of the electric pump can be adjusted, and the temperature of the electric pile is further adjusted.
Optionally, the target temperature difference value is determined by the following method:
and acquiring historical temperature difference data, and acquiring a target temperature difference value of the reactor in and out under the current working condition according to the historical temperature difference data.
Specifically, according to the obtained historical temperature difference data, an optimal temperature difference set value of the reactor inlet and outlet under each working condition can be obtained through an engineering method, namely the temperature difference value of the reactor inlet and outlet under the current working condition is the target temperature difference value.
Alternatively, fig. 5 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention. On the basis of the foregoing embodiment, referring to fig. 5, the electric pump control method for a battery system provided in this embodiment includes:
s101, acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid.
S102, determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid.
S201, acquiring first temperature information of cooling liquid entering the galvanic pile.
S202, obtaining second temperature information of the cooling liquid flowing out of the galvanic pile.
S401, calculating the temperature difference value of the cooling liquid entering and exiting the galvanic pile under the current working condition according to the first temperature information and the second temperature information.
S501, determining PID gain data of the flow of the cooling liquid output by the electric pump according to the temperature difference value of the cooling liquid and the target temperature difference value.
Specifically, the temperature difference value of the cooling liquid entering and exiting the galvanic pile can be influenced by the flow rate of the cooling liquid, and the PID gain data of the flow rate of the cooling liquid output by the electric pump can be calculated by determining the temperature difference value of the cooling liquid and the target temperature difference value.
S502, determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump.
Specifically, the flow rate of the cooling liquid depends on the rotation speed of the electric pump, and the gain of the flow rate of the cooling liquid is realized by adjusting the rotation speed of the electric pump. The PID gain value of the rotation speed of the electric pump can be determined according to the current basic rotation speed value of the electric pump and the PID gain data of the flow of the cooling liquid output by the electric pump.
And S403, adjusting the rotating speed of the electric pump according to the PID gain value of the rotating speed of the electric pump and the basic rotating speed value of the electric pump.
Specifically, after the basic rotating speed value of the electric pump is adjusted through the electric pump rotating speed PID gain value, the electric pump rotating speed can accurately adjust the temperature of the electric pile, so that the fuel cell system works at a proper temperature.
Alternatively, fig. 6 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 6, the electric pump control method of the battery system provided in this embodiment includes:
s101, acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid.
S102, determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid.
S201, acquiring first temperature information of cooling liquid entering the galvanic pile.
S202, obtaining second temperature information of the cooling liquid flowing out of the galvanic pile.
S401, calculating the temperature difference value of the cooling liquid entering and exiting the galvanic pile under the current working condition according to the first temperature information and the second temperature information.
S501, determining PID gain data of the flow of the cooling liquid output by the electric pump according to the temperature difference value of the cooling liquid and the target temperature difference value.
S601, carrying out proportional calculation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Kp.
Specifically, the calculation of the PID gain parameters includes a proportional calculation step, an integral calculation step and a differential calculation step. And carrying out proportional calculation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target proportional gain parameter Kp, wherein the proportional calculation is used for quickly reducing the rotating speed deviation of the electric pump and accelerating the response speed of the electric pump.
S602, performing integral operation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Ki.
Specifically, according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump, integral operation is carried out on the rotating speed of the electric pump, a target integral gain parameter Ki can be obtained, and the integral operation is used for eliminating the steady-state error of the rotating speed of the electric pump.
S603, according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump, carrying out differential calculation on the rotating speed of the electric pump to obtain a target PID gain parameter Kd.
Specifically, the differential calculation is performed on the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the PID gain data of the flow rate of the cooling liquid output by the electric pump, so that a target differential gain parameter Kd can be obtained, and the differential calculation is used for improving the dynamic characteristic and preventing the rotation speed of the electric pump from suddenly changing.
And S403, adjusting the rotating speed of the electric pump according to the PID gain value of the rotating speed of the electric pump and the basic rotating speed value of the electric pump.
Alternatively, fig. 7 is a flowchart of an electric pump control method of another battery system according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 7, the electric pump control method of the battery system according to the present embodiment includes:
s101, acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid.
S102, determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid.
S201, acquiring first temperature information of cooling liquid entering the galvanic pile.
S202, obtaining second temperature information of the cooling liquid flowing out of the galvanic pile.
S401, calculating the temperature difference value of the cooling liquid entering and exiting the galvanic pile under the current working condition according to the first temperature information and the second temperature information.
S402, determining a PID gain value of the rotation speed of the electric pump according to the temperature difference value of the cooling liquid, the basic rotation speed value of the electric pump and the target temperature difference value.
And S701, adding the basic rotating speed value of the electric pump and the PID gain value of the rotating speed of the electric pump, and obtaining a set value of the rotating speed of the electric pump based on the safety protection limit value of the rotating speed of the electric pump.
Specifically, the safety protection limit value of the rotation speed of the electric pump comprises a maximum rotation speed limit value and a minimum rotation speed limit value, and when a calculated value obtained by adding a basic rotation speed value of the electric pump and a PID gain value of the rotation speed of the electric pump exceeds the maximum rotation speed limit value, the maximum rotation speed limit value is used as a set value of the rotation speed of the electric pump. And when a calculated value obtained by adding the basic rotating speed value of the electric pump and the PID gain value of the rotating speed of the electric pump is lower than the minimum rotating speed limit value, taking the minimum rotating speed limit value as a set value of the rotating speed of the electric pump. The arrangement can ensure that the set value of the rotation speed of the electric pump is in a safe range.
And S702, controlling the electric pump to operate at a set value of the rotation speed of the electric pump.
Specifically, the optimal running rotating speed obtained by calculation when the set value of the rotating speed of the electric pump runs is used for controlling the electric pump to run at the set value of the rotating speed of the electric pump, so that the working efficiency of the electric pile can be improved, and the safety of a fuel cell system is ensured.
Optionally, fig. 8 is a schematic diagram of an electric pump control method of a battery system according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 8, a is target power generation information including a calorific value of hydrogen, an average voltage of a battery, a current of a stack, and the number of cells of the stack, K is a stack heat generation amount, R1 is a base rotation speed value of an electric pump, T1 is a temperature of a coolant entering the stack, T2 is a temperature of the coolant exiting the stack, T3 is a temperature difference value of the coolant of the stack, kp is a proportional gain parameter in PID calculation, ki is an integral gain parameter in PID calculation, kd is a differential gain parameter in PID calculation, and R2 is a set value of a rotation speed of the electric pump. The target power generation information A can obtain the galvanic pile heat production K through heat calculation, and the basic rotating speed value R1 of the electric pump can be obtained through the rotating speed calculation of the electric pump. The temperature T1 of the cooling liquid entering the galvanic pile is different from the temperature T2 of the cooling liquid flowing out of the galvanic pile to obtain a temperature difference value T3 of the cooling liquid of the galvanic pile, a proportional gain parameter Kp, an integral gain parameter Ki and a differential gain parameter Kd of the rotation speed of the electric pump can be obtained by performing PID calculation on a basic rotation speed value R1 of the electric pump and the temperature difference value T3 of the cooling liquid of the galvanic pile, and the proportional gain parameter Kp, the integral gain parameter Ki and the differential gain parameter Kd of the rotation speed of the electric pump are added to the basic rotation speed value R1 of the electric pump to obtain a set value R2 of the rotation speed of the electric pump.
Alternatively, fig. 9 is a schematic structural diagram of an electric pump control device of a battery system according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 9, an electric pump control device 10 of a battery system according to an embodiment of the present invention is applied to a battery system, the battery system includes an electric stack 1, an inlet stack cooling liquid temperature sensor 3, an outlet stack cooling liquid temperature sensor 4, and a temperature adjustment device, the temperature adjustment device includes an electric pump 2 and a cooling pipeline, and cooling liquid flows through the cooling pipeline. The electric pump control device 10 includes:
the first acquisition module 11 is used for acquiring target power generation information of the battery and the heat transfer efficiency value of the cooling liquid.
And the calculation module 12 is configured to determine a basic rotation speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid.
And a second acquiring module 13 for acquiring temperature information of the cooling liquid entering and exiting the stack.
And the control and regulation module 14 is used for determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information so as to regulate the rotation speed of the electric pump.
Optionally, the calculating module 12 is further configured to calculate a temperature difference value of the coolant entering and exiting the stack under the current working condition according to the first temperature information and the second temperature information. And determining a PID gain value of the rotation speed of the electric pump according to the temperature difference value of the cooling liquid, the basic rotation speed value of the electric pump and the target temperature difference value.
Optionally, the calculation module 12 is further configured to determine PID gain data of the flow rate of the cooling liquid output by the electric pump according to the temperature difference value of the cooling liquid and the target temperature difference value. And determining the PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the PID gain data of the flow of the cooling liquid output by the electric pump.
Optionally, the calculation module 12 is further configured to add the basic rotation speed value of the electric pump to the PID gain value of the rotation speed of the electric pump, and obtain a set value of the rotation speed of the electric pump based on the safety protection limit value of the rotation speed of the electric pump.
Optionally, the calculation module 12 is further configured to perform proportional calculation on the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the PID gain data of the flow rate of the cooling liquid output by the electric pump, so as to obtain a target PID gain parameter Kp. And performing integral operation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and the PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Ki. And according to the basic rotating speed value of the electric pump and the PID gain data of the flow of the cooling liquid output by the electric pump, carrying out differential calculation on the rotating speed of the electric pump to obtain a target PID gain parameter Kd.
Optionally, the second obtaining module 13 is further configured to obtain first temperature information of the coolant entering the stack and second temperature information of the coolant flowing out of the stack.
Optionally, the control and regulation module 14 is also used to control the electric pump to operate at a set value of the electric pump speed.
The electric pump control device of the battery system provided by the embodiment of the invention comprises a first acquisition module, a calculation module, a second acquisition module and a control and regulation module. The first acquisition module acquires target power generation information of the battery and a heat transfer efficiency value of the cooling liquid, and the second acquisition module acquires first temperature information of the cooling liquid entering the cell stack and second temperature information of the cooling liquid flowing out of the cell stack. The calculating unit calculates flow demand information of the cooling liquid according to the parameters acquired by the first acquiring module and determines a basic rotating speed value of the electric pump according to the flow demand information. The calculating unit calculates the temperature difference value of the cooling liquid of the galvanic pile according to the parameters acquired by the second acquiring module, determines PID gain data of the flow rate of the cooling liquid output by the electric pump according to the temperature difference value of the cooling liquid and the target temperature difference value, and determines the PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the PID gain data of the flow rate of the cooling liquid output by the electric pump. And adding the basic rotating speed value of the electric pump and the PID gain value of the rotating speed of the electric pump, obtaining the set value of the rotating speed of the electric pump based on the safety protection limit value of the rotating speed of the electric pump, and controlling the electric pump to operate according to the set value of the rotating speed of the electric pump by the control module. The control precision of the fuel cell water pump is improved, the service life of the fuel cell stack is prolonged, and the working efficiency of the stack is improved.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The electric pump control method of the battery system is characterized in that the electric pump control method of the battery system is applied to the battery system, the battery system comprises an electric pile and a temperature adjusting device, the temperature adjusting device comprises an electric pump and a cooling pipeline, and cooling liquid flows through the cooling pipeline; the method comprises the following steps:
acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid;
determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid;
acquiring temperature information of cooling liquid entering and flowing out of the galvanic pile;
and determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the temperature information so as to adjust the rotation speed of the electric pump.
2. The method of claim 1, wherein said obtaining temperature information of the coolant entering and exiting the stack comprises:
acquiring first temperature information of cooling liquid entering the galvanic pile;
and acquiring second temperature information of the cooling liquid flowing out of the electric pile.
3. The method of claim 1, wherein determining a base speed value of an electric pump based on the target power generation information and the heat transfer efficiency value of the coolant comprises:
calculating heat generation information of the battery according to the target power generation information;
calculating flow demand information of the cooling liquid according to the heating value information and the heat transfer efficiency value of the cooling liquid;
and determining a basic rotating speed value of the electric pump according to the flow demand information.
4. The method according to claim 3, wherein the target power generation information includes a heating value of hydrogen gas, an average voltage of a cell, a current of a stack, and the number of cells of the stack;
the calculating the heat generation amount information of the battery according to the target power generation information comprises the following steps:
the calorific value information of the battery is calculated by adopting the following formula:
K＝(eHV–ecell)×I×N/1000 (1)
wherein K is the heat (kilowatt) generated by the galvanic pile, eHV is the heat value of hydrogen, ecell is the average voltage of the battery, I is the current of the galvanic pile, and N is the number of single cells of the galvanic pile.
5. The method of claim 2, wherein determining a PID gain value for a speed of rotation of an electric pump based on the base speed value of the electric pump and the temperature information to adjust the speed of rotation of the electric pump comprises:
calculating the temperature difference value of the cooling liquid entering and exiting the galvanic pile under the current working condition according to the first temperature information and the second temperature information;
determining a PID gain value of the rotation speed of the electric pump according to the temperature difference value of the cooling liquid, the basic rotation speed value of the electric pump and the target temperature difference value;
and adjusting the rotating speed of the electric pump according to the PID gain value of the rotating speed of the electric pump and the basic rotating speed value of the electric pump.
6. The method of claim 5, wherein the target temperature difference value is determined by:
and acquiring historical temperature difference data, and acquiring a target temperature difference value of the reactor entering and exiting under the current working condition according to the historical temperature difference data.
7. The method of claim 5, wherein determining an electric pump speed PID gain value based on the coolant temperature difference, the electric pump base speed value, and the target temperature difference value comprises:
determining PID gain data of the flow of the cooling liquid output by the electric pump according to the temperature difference value of the cooling liquid and the target temperature difference value;
and determining the PID gain value of the rotation speed of the electric pump according to the basic rotation speed value of the electric pump and the PID gain data of the flow of the cooling liquid output by the electric pump.
8. The method of claim 7, wherein determining an electric pump speed PID gain value based on a base speed value of the electric pump and PID gain data of the flow rate of the electric pump output coolant comprises:
according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump, carrying out proportional calculation on the rotating speed of the electric pump to obtain a target PID gain parameter Kp;
performing integral operation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Ki;
and carrying out differential calculation on the rotating speed of the electric pump according to the basic rotating speed value of the electric pump and PID gain data of the flow of the cooling liquid output by the electric pump to obtain a target PID gain parameter Kd.
9. The method of claim 5, wherein said adjusting the speed of the electric pump based on the electric pump speed PID gain value and the electric pump base speed value comprises:
adding the basic rotating speed value of the electric pump and the PID gain value of the rotating speed of the electric pump, and obtaining a set value of the rotating speed of the electric pump based on the safety protection limit value of the rotating speed of the electric pump;
and controlling the electric pump to operate at the set value of the rotation speed of the electric pump.
10. An electric pump control device of a battery system is characterized in that the electric pump control device of the battery system is applied to the battery system, the battery system comprises an electric stack and a temperature adjusting device, the temperature adjusting device comprises an electric pump and a cooling pipeline, and cooling liquid flows through the cooling pipeline;
the electric pump control device of the battery system includes:
the first acquisition module is used for acquiring target power generation information of the battery and a heat transfer efficiency value of the cooling liquid;
the calculation module is used for determining a basic rotating speed value of the electric pump according to the target power generation information and the heat transfer efficiency value of the cooling liquid;
the second acquisition module is used for acquiring temperature information of cooling liquid entering and flowing out of the galvanic pile;
and the control and regulation module is used for determining a PID gain value of the rotation speed of the electric pump according to the basic rotation speed value and the temperature information of the electric pump so as to regulate the rotation speed of the electric pump.
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| CN202211398408.XA CN115663243A (en) | 2022-11-09 | 2022-11-09 | Electric pump control method and device of battery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211398408.XA CN115663243A (en) | 2022-11-09 | 2022-11-09 | Electric pump control method and device of battery system |
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