CN111048851A - Battery temperature management system control method, device, equipment and storage medium - Google Patents
Battery temperature management system control method, device, equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The embodiment of the application discloses a control method, a device, equipment and a storage medium of a battery temperature management system, relating to the technical field of battery temperature control and comprising the following steps: acquiring inlet water temperature data of a battery temperature management system; calculating instantaneous change parameters and periodic change parameters of the inlet water temperature of the battery temperature management system according to the inlet water temperature data; determining a compressor rotation speed value of a battery temperature management system according to the instantaneous change parameter and the periodic change parameter; calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor; and controlling the compressor to operate according to the rotating speed value of the compressor, and controlling the fan to operate according to the PWM value of the fan so as to realize control of the battery temperature management system. By adopting the scheme, the technical problem of large hysteresis when the water-cooling battery thermal management system is used for controlling the temperature in the prior art can be solved.
Description
Technical Field
The embodiment of the application relates to the technical field of battery temperature control, in particular to a battery temperature management system control method, device, equipment and storage medium.
Background
The new energy electric automobile comprises the following components: an electric drive and control system, a mechanical system such as a drive transmission, a working device for performing a predetermined task, and the like. The battery of the new energy electric automobile drives the motor to provide electric energy. Along with the popularization of new energy electric vehicles, the requirement on the working environment temperature of the battery gradually rises, particularly after the rapid development of the battery quick-charging technology, the working environment temperature of the battery can be greatly increased when the battery is charged, and at the moment, the working environment temperature of the battery needs to be managed in order to guarantee the stability and the safety of the battery.
The existing new energy electric automobile usually adopts a water-cooling battery thermal management system as a battery temperature management system for managing the working environment temperature of the battery. Fig. 1 is a schematic structural diagram of a water-cooled battery thermal management system. Referring to fig. 1, the water-cooled battery thermal management system includes a plate heat exchanger, an expansion valve, a low-pressure refrigerant pipe, a compressor, a high-pressure cold coal pipe, a condenser, and a fan. The low-pressure coal cooling pipe and the high-pressure refrigerant pipe are internally provided with refrigerants. The plate heat exchanger conveys cold water to the battery to cool the battery through the cold water, at the moment, the battery returns hot water to the plate heat exchanger, then the returned hot water is subjected to heat exchange through the cold coal and the plate heat exchanger, and the cooled cold water is conveyed to the battery again. The temperature and the flow rate of the refrigerant can be adjusted through the compressor and the fan, and the heat exchange efficiency is further changed.
However, in the above water-cooled battery thermal management system, the water temperature needs to change after a period of time after the rotational speed of the compressor is adjusted, so that the water-cooled battery thermal management system has a large hysteresis, which is not beneficial to managing the temperature of the battery working environment.
Disclosure of Invention
The application provides a battery temperature management system control method, a battery temperature management system control device, equipment and a storage medium, and aims to solve the technical problem that a water-cooled battery thermal management system in the prior art has high hysteresis when temperature control is carried out.
In a first aspect, an embodiment of the present application provides a method for controlling a battery temperature management system, including:
acquiring inlet water temperature data of a battery temperature management system;
calculating instantaneous change parameters and periodic change parameters of the inlet water temperature of the battery temperature management system according to the inlet water temperature data;
determining a compressor rotation speed value of a battery temperature management system according to the instantaneous change parameter and the periodic change parameter;
calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor;
and controlling the compressor to operate according to the rotating speed value of the compressor, and controlling the fan to operate according to the PWM value of the fan so as to realize control of the battery temperature management system.
In a second aspect, an embodiment of the present application further provides a battery temperature management system control device, including:
the data acquisition module is used for acquiring inlet water temperature data of the battery temperature management system;
the parameter calculation module is used for calculating instantaneous change parameters and periodic change parameters of the inlet water temperature of the battery temperature management system according to the inlet water temperature data;
the rotating speed value determining module is used for determining a compressor rotating speed value of the battery temperature management system according to the instantaneous change parameter and the periodic change parameter;
the adjustment value determining module is used for calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor;
and the operation control module is used for controlling the operation of the compressor according to the rotating speed value of the compressor and controlling the operation of the fan according to the PWM value of the fan so as to realize the control of the battery temperature management system.
In a third aspect, an embodiment of the present application further provides a battery temperature management system control device, including:
one or more processors;
a memory for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the battery temperature management system control method according to the first aspect.
In a fourth aspect, embodiments of the present application further provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform the battery temperature management system control method according to the first aspect.
According to the control method, the device, the equipment and the storage medium of the battery temperature management system, the instantaneous change parameter and the periodic change parameter of the inlet water temperature are obtained by obtaining the inlet water temperature data of the battery temperature management system, then the rotating speed value of the compressor is determined according to the instantaneous change parameter and the periodic change parameter, the fan PWM value of the battery temperature management system is calculated according to the rotating speed value of the compressor, the compressor is controlled to operate according to the rotating speed value of the compressor, and the fan is controlled to operate according to the fan PWM value. The water temperature can be pre-judged through the instantaneous change parameters and the periodic change parameters, and the accuracy of the water-cooled battery thermal management system in temperature control is further ensured.
Drawings
FIG. 1 is a schematic structural diagram of a water-cooled battery thermal management system;
fig. 2 is a flowchart of a control method of a battery temperature management system according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a control method of a battery temperature management system according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a control device of a battery temperature management system according to a third embodiment of the present application;
fig. 5 is a schematic structural diagram of a control device of a battery temperature management system according to a fourth embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are for purposes of illustration and not limitation. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action or object from another entity or action or object without necessarily requiring or implying any actual such relationship or order between such entities or actions or objects. For example, "first" and "second" of a first preset temperature and a second preset temperature are used to distinguish two different preset temperatures.
Example one
Fig. 2 is a flowchart of a control method of a battery temperature management system according to an embodiment of the present disclosure. The battery temperature management system control method provided in the embodiment may be executed by a battery temperature management system control device, which may be implemented in software and/or hardware and integrated in a battery temperature management system control apparatus. The battery temperature management system control device may be an intelligent device with data processing and analysis capabilities. It can be understood that the battery temperature management system control device may be composed of one intelligent device or may be composed of a plurality of intelligent devices. Further, the battery temperature management system control device may be integrated in the battery temperature management system, for example, the battery temperature management system control device may be added to the battery temperature management system of fig. 1, and the battery temperature management system control device may control the compressor rotation speed and the fan PWM value. Optionally, the battery temperature management system control device may further control the plate heat exchanger and the expansion valve.
Specifically, referring to fig. 2, the method for controlling the battery temperature management system specifically includes:
and step 110, acquiring inlet water temperature data of the battery temperature management system.
Specifically, the first temperature sensor used for collecting the water inlet temperature is arranged at the water inlet of the plate type heat exchanger of the battery temperature management system, and the first temperature sensor can be in data communication with the control equipment of the battery temperature management system to report the water inlet temperature data of the plate type heat exchanger. Optionally, the battery temperature management system control device may obtain the inlet water temperature data collected by the first temperature sensor in real time or at intervals. The working environment temperature of the battery can be determined through the water inlet temperature data.
And step 120, calculating instantaneous change parameters and periodic change parameters of the inlet water temperature of the battery temperature management system according to the inlet water temperature data.
Illustratively, the instantaneous variation parameter and the periodic variation parameter are calculated using differential equations. Wherein the differential formula is:
wherein, T (n) is a parameter of the current acquisition time, T (n-1) is a parameter of the last acquisition time, and T is an acquisition period. Specifically, in the embodiment, the inflow water temperature data obtained at the current collection time is taken as T (n), the inflow water temperature data obtained at the previous collection time is taken as T (n-1), and the time interval between the two collection times is taken as T. By using the formula, the instantaneous change parameter of the water inlet temperature data can be calculated and recorded as T(now). Similarly, the water inlet temperature number obtained at the current acquisition momentAccording to the formula, the periodic variation parameter of the inlet water temperature data can be calculated and recorded as T (n), the inlet water temperature data obtained at the first acquisition moment in the set time period is taken as T (n-1), the set time period is taken as T, and the periodic variation parameter is recorded as T(whole). The set time period can be set according to actual conditions, and is generally an integral multiple of a time interval between two acquisition moments, for example, 10 time intervals are taken as one set time period.
And step 130, determining a compressor rotating speed value of the battery temperature management system according to the instantaneous change parameter and the periodic change parameter.
It will be appreciated that the greater the compressor speed value, the greater the cooling effectiveness on the battery.
Specifically, when the temperature of the inlet water is low, it indicates that the temperature of the current battery is low, at this time, the compressor is in a low-temperature constant-speed region, namely, the battery does not need to be cooled, and the rotating speed value of the compressor can be set to be the lowest rotating speed value of the compressor no matter how the instantaneous change parameter and the periodic change parameter change. When the temperature of the inlet water is lower, the temperature of the current battery is lower, at this time, the compressor is in a low-temperature forced control area, and then, if the temperature of the battery is continuously reduced or the battery is continuously at a lower temperature according to the instantaneous change parameter and the periodic change parameter, the current rotating speed of the compressor needs to be reduced, and the rotating speed value of the compressor after reduction is obtained. When the temperature of the inlet water is not high or low, the temperature of the current battery is normal, at the moment, the compressor is in a weak control area, and then if the temperature of the battery is determined to be continuously reduced according to the instantaneous change parameter and the periodic change parameter, the current rotating speed of the compressor needs to be reduced to avoid the temperature from being continuously reduced, and the rotating speed value of the compressor after the temperature is reduced is obtained. If the temperature of the battery is determined to be continuously increased according to the instantaneous change parameter and the periodic change parameter, the current rotating speed of the compressor needs to be increased to prevent the temperature from being continuously increased, and the rotating speed value of the compressor after the temperature is increased is obtained. When the temperature of the inlet water is higher, it is indicated that the temperature of the current battery is higher, at this time, the compressor is in a high-temperature forced control area, and then, if the temperature of the battery is continuously increased or the battery is continuously at a higher temperature according to the instantaneous change parameter and the periodic change parameter, the current rotating speed of the compressor needs to be increased to prevent the temperature from being continuously increased, and the rotating speed value of the increased compressor is obtained. When the temperature of the inlet water is very high, the temperature of the current battery is very high, at the moment, the compressor is in a high-temperature constant-speed area, namely, the battery must be cooled, and the rotating speed value of the compressor can be set to be the highest rotating speed value of the compressor no matter how instantaneous change parameters and periodic change parameters change, so that the best cooling effect is achieved.
And step 140, calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor.
PWM refers to pulse width modulation, which is an analog control method. This way the output voltage of the power supply can be kept constant when the operating conditions change, which is a very effective technique for controlling an analog circuit by means of the digital signal of the microprocessor. In an embodiment, the fan PWM value is calculated by the compressor speed value to ensure that the desired temperature control effect is achieved.
Specifically, the calculation mode of the fan PWM value may be set according to actual conditions. The fan PWM value is calculated, for example, using the formula y-Kx + B, where y is the fan PWM value, x is the compressor speed value,
PWMHfor maximum PWM value of fan, PWMLIs the minimum PWM value of the fan, VHIs the maximum value of the speed of rotation, V, of the compressorLIs the lowest rotating speed value of the compressor,
wherein, PWMH、PWML、VHAnd VLIs a fixed value, which is determined according to the model of the fan and the compressor. By adopting the above calculation formula, the fan PWM value can be obtained.
And 150, controlling the compressor to operate according to the rotating speed value of the compressor, and controlling the fan to operate according to the PWM value of the fan so as to control the battery temperature management system.
Specifically, the compressor is adjusted to the currently calculated compressor rotating speed value, the fan is adjusted to the currently calculated PWM value, so that the compressor and the fan are controlled, the cold coal temperature and the refrigerant flow rate are controlled, namely, the refrigeration power is controlled, and the water temperature in the battery temperature management system is accurately controlled.
The technical scheme includes that instantaneous change parameters and periodic change parameters of inlet water temperature are obtained by obtaining inlet water temperature data of the battery temperature management system, then the rotating speed value of the compressor is determined according to the instantaneous change parameters and the periodic change parameters, the fan PWM value of the battery temperature management system is calculated according to the rotating speed value of the compressor, the compressor is controlled to operate according to the rotating speed value of the compressor, and the fan is controlled to operate according to the fan PWM value. The water temperature can be pre-judged through the instantaneous change parameters and the periodic change parameters, and the accuracy of the water-cooled battery thermal management system in temperature control is further ensured.
Example two
Fig. 3 is a flowchart of a control method of a battery temperature management system according to a second embodiment of the present application. The control method of the battery temperature management system provided by the embodiment is embodied on the basis of the above embodiment.
Specifically, referring to fig. 3, the method for controlling a battery temperature management system according to this embodiment includes:
Step 203, in the inlet water temperature set, determining a temperature subset to which the inlet water temperature data belongs.
Specifically, the low-temperature constant-speed area, the low-temperature forced control area, the weak control area, the high-temperature forced control area and the high-temperature constant-speed area all have corresponding temperature subsets, and the temperature subsets form a water inlet temperature set. Further, the temperature range of each temperature subset may be determined by combining the operating parameters of the battery and the battery temperature management system, which is not limited by the embodiment. For example, the temperature subset combination corresponding to the low-temperature constant-speed area is determined to be 17-20 ℃, the temperature subset combination corresponding to the low-temperature forced control area is determined to be 20-22 ℃, the temperature subset combination corresponding to the weak control area is determined to be 22-28 ℃, the temperature subset combination corresponding to the high-temperature forced control area is determined to be 28-30 ℃, and the temperature subset combination corresponding to the high-temperature constant-speed area is determined to be more than 30 ℃.
At this point, a subset of temperatures to which the inlet water temperature data belongs may be determined. For example, the water inlet temperature data is 28 ℃, and the water inlet temperature data is determined to belong to the weak control area. And the water inlet temperature data is 29 ℃, and the water inlet is determined to belong to a high-temperature forced control area.
And step 204, obtaining a compressor rotating speed calculation rule of the temperature subset.
Specifically, each temperature subset has a corresponding compressor speed calculation rule. The compressor rotating speed calculation rule is used for judging whether the current instantaneous change parameter and the current periodic change parameter meet the rule of changing the compressor rotating speed value. It will be appreciated that each of the compressor speed calculation rules contains an extreme value of the instantaneously varying parameter and an extreme value of the periodically varying parameter to determine whether the compressor speed calculation rule is satisfied by comparison with the extreme values. Wherein, the extreme value of each compressor rotating speed calculation rule can be set according to the actual condition. For example, the calculation rule of the rotation speed of the compressor corresponding to the high-temperature constant-speed region is as follows: t is(now)And T(whole)Is any value; the calculation rule of the rotating speed of the compressor corresponding to the high-temperature forced control area is as follows: t is(now)≥0&&T(whole)More than or equal to-1; the calculation rule of the rotating speed of the compressor corresponding to the weak control area is as follows: t is(now)＞0&&T(whole)> 2 or T(now)＜0&&T(whole)< -2 >; the calculation rule of the rotating speed of the compressor corresponding to the low-temperature forced control area is as follows: t is(now)≤0&&T(whole)Less than or equal to 1; the calculation rule of the rotating speed of the compressor corresponding to the low-temperature constant-speed area is as follows: t is(now)And T(whole)Is any value. Wherein,&&is the meaning of "and". It is understood that the above extreme values are only examples and are not limiting.
And step 205, determining a compressor rotating speed value of the battery temperature management system according to the instantaneous change parameter, the periodic change parameter and the compressor rotating speed calculation rule.
Furthermore, each compressor rotating speed calculation rule has corresponding compressor rotating speed adjustment data. And acquiring corresponding compressor rotating speed adjusting data when the compressor rotating speed calculating rule is met, and acquiring a new compressor rotating speed value as the compressor rotating speed value of the battery temperature management system according to the compressor rotating speed adjusting data. Otherwise, keeping the current compressor rotating speed value of the battery temperature management system unchanged.
It can be understood that the compressor rotation speed adjustment data corresponding to each compressor rotation speed calculation rule can be set according to actual conditions. For example, when the compressor is in the high-temperature constant-speed region, the corresponding compressor rotation speed calculation rule is T(now)And T(whole)And at the moment, the rotating speed value of the compressor is set to be the highest rotating speed value of the compressor no matter what the instantaneous change parameter and the periodic change parameter are, and the rotating speed adjusting data of the compressor is obtained according to the highest rotating speed value of the compressor and the current rotating speed value of the compressor. For another example, the compressor is in the high temperature forced control area, and the corresponding compressor rotation speed calculation rule is T(now)≥0&&T(whole)And the value is more than or equal to-1, when the instantaneous change parameter is more than or equal to 0 and the periodic change parameter is more than or equal to-1, the temperature of the battery is continuously increased or the temperature of the battery is maintained in a higher state, and the rotating speed adjustment data of the compressor is determined to be +100rpm, namely the rotating speed value of the compressor is increased by 100rpm on the basis of the current rotating speed value of the compressor. Otherwise, the current compressor rotation speed value is maintained. In another example, the compressor is in the weak control region, and the corresponding calculation rule of the rotating speed of the compressor is T(now)＞0&&T(whole)> 2 or T(now)＜0&&T(whole)< -2 >, when the instantaneous variation parameter is greater than or equal to 0 and the periodic variation parameter is greater than or equal to 2, it indicates that the temperature of the battery is continuously increased and the increasing speed is high, and when the compressor rotation speed adjustment data is determined to be +100rpm, namely the compressor rotation speed value is the current compressor rotation speed valueIncreasing 100rpm on a base. When the instantaneous variation parameter is less than 0 and the periodic variation parameter is less than-2, the temperature of the battery is continuously reduced, and the acceleration is reduced rapidly, and the rotating speed adjustment data of the compressor is determined to be-100 rpm, namely the rotating speed value of the compressor is reduced by 100rpm on the basis of the current rotating speed value of the compressor. If the instantaneous change parameter and the periodic change parameter do not meet the range, the current rotating speed value of the compressor is kept. If the compressor is in the low-temperature forced control area, the corresponding calculation rule of the rotating speed of the compressor is T(now)≤0&&T(whole)And (3) being less than or equal to 1, wherein when the instantaneous variation parameter is less than 0 and the periodic variation parameter is less than or equal to 1, the temperature of the battery is continuously reduced or the temperature of the battery is maintained in a lower state, and the rotating speed adjustment data of the compressor is determined to be-100 rpm, namely the rotating speed value of the compressor is reduced by 100rpm on the basis of the current rotating speed value of the compressor. Otherwise, the current compressor rotation speed value is maintained. If the compressor is in a low-temperature constant-speed region, the corresponding calculation rule of the rotating speed of the compressor is T(now)And T(whole)The value is any value, at the moment, no matter what value the instantaneous change parameter and the periodic change parameter are, the rotating speed value of the compressor is set to be the lowest rotating speed value of the compressor, and the rotating speed adjusting data of the compressor are obtained according to the lowest rotating speed value of the compressor and the current rotating speed value of the compressor.
For example, in practical applications, when the periodic variation parameter is too large or too small, it is indicated that the temperature of the battery changes too fast within a set time period, which may adversely affect the battery. Therefore, in order to avoid the above situation, when the periodic variation parameter is too large or too small, a corresponding countermeasure needs to be taken to avoid the battery temperature from changing too fast. It will be appreciated that the minimum and maximum compressor speed values are typically already taken when the compressor is in the low or high temperature constant speed region, and therefore no compensation is required. Accordingly, whether the periodic variation parameter is greater than the first variation rate threshold value is judged only when the compressor is in a high-temperature forced control area, a weak control area or a low-temperature forced control area.
In the embodiment, the first change rate threshold is determined to be 20 by combining each temperature subset. When the periodic variation parameter is greater than the first variation rate threshold, which indicates that the temperature of the battery is increasing too fast, step 207 is executed. When the cyclical variation parameter is less than the first rate-of-change threshold, step 208 is performed.
And step 207, increasing the rotating speed value of the compressor. Step 210 is performed.
Specifically, in order to avoid the battery from heating up too fast, the rotation speed value of the compressor needs to be increased. The amount of increase may be set according to actual conditions. In an embodiment, the determined increase is determined to be 200rpm in conjunction with each temperature subset, i.e. 200rpm is added to the compressor speed value to obtain the latest compressor speed value.
And step 208, judging whether the period change parameter is smaller than a second change rate threshold value. If the second rate of change threshold is less than the second rate of change threshold, step 209 is performed. Otherwise, step 210 is performed.
In the embodiment, the second change rate threshold is determined to be-20 by combining each temperature subset. When the periodic variation parameter is smaller than the second variation rate threshold, which indicates that the battery is cooled down too fast, step 209 is executed. If the periodic variation parameter is greater than or equal to the second variation rate threshold, it indicates that the battery is cooled normally, then step 210 is executed.
And step 209, reducing the rotating speed value of the compressor. Step 210 is performed.
Specifically, in order to avoid excessive battery cooling, the compressor speed needs to be reduced. Wherein the reduction amount can be set according to actual conditions. In an embodiment, the reduction is determined to be 200rpm in conjunction with each temperature subset, i.e. 200rpm is subtracted from the compressor speed value to obtain the latest compressor speed value.
It will be appreciated that the second rate of change threshold may be compared first, and the first rate of change threshold may be compared if greater than the second rate of change threshold.
And step 210, acquiring current environmental temperature data of the battery temperature management system.
Specifically, a second temperature sensor for acquiring the ambient temperature of the system is arranged in the battery temperature management system. The second temperature sensor may be of the same type as or different from the first temperature sensor, and the same is exemplified in the embodiments. Further, the second temperature sensor may be in data communication with the battery temperature management system control device to report ambient temperature data of the battery temperature management system. Optionally, the battery temperature management system control device may acquire the ambient temperature data acquired by the second temperature sensor in real time or at intervals.
And step 211, judging whether the environmental temperature data is greater than a second preset temperature. If the environmental temperature data is less than or equal to the second predetermined temperature, step 212 is executed. If the environmental temperature data is greater than the second predetermined temperature, step 213 is executed.
Illustratively, the stability of the battery temperature management system may be determined from ambient temperature data. Generally, the higher or lower the ambient temperature data, the worse the stability of the battery temperature management system. Specifically, the second preset temperature is preset, which can be understood as the lowest temperature at which the battery temperature management system stably operates. When the environmental temperature data is less than or equal to the second preset temperature, which indicates that the stability of the battery temperature management system is poor, step 212 is executed. Otherwise, step 213 is performed.
And step 212, replacing the compressor rotating speed value with the lowest compressor rotating speed value. Step 216 is performed.
It should be noted that when the ambient temperature data is low, the refrigerant pressure is low, and at this time, if the rotation speed value of the compressor is large, the refrigerant pressure in the low-pressure cold coal pipe is lower than the alarm threshold value, which may cause the battery temperature management system to be unable to start. Therefore, in order to ensure the normal start of the battery temperature management system, the embodiment adopts the lowest rotating speed value of the compressor to replace the rotating speed value of the compressor. The embodiment of the determination method of the alarm threshold is not limited.
Specifically, a third preset temperature is preset, and the third preset temperature is higher than the second preset temperature. The third preset temperature may be understood as the highest temperature at which the battery temperature management system stably operates. When the environmental temperature data is greater than or equal to the third preset temperature, which indicates that the stability of the battery temperature management system is poor, step 214 is executed. Otherwise, step 216 is performed.
And step 214, judging whether the rotating speed value of the compressor is greater than the set rotating speed value of the compressor. If the rotation speed is larger than the set rotation speed value of the compressor, step 215 is executed, otherwise, step 216 is executed.
The set rotation speed value of the compressor is the maximum rotation speed of the compressor when the environmental temperature data is greater than or equal to the third preset temperature and the battery temperature management system is ensured to stably run, and the set rotation speed value of the compressor and the maximum rotation speed value V of the compressorHMay be different. Specifically, it is determined whether the current compressor rotation speed value is greater than the set compressor rotation speed value, i.e., whether the compressor is running in overload, if yes, step 215 is executed. Otherwise, if the compressor is operating normally, step 216 is executed.
And step 215, replacing the compressor rotating speed value with the set compressor rotating speed value.
Specifically, the set rotating speed value of the compressor is used for replacing the rotating speed value of the compressor, and a new rotating speed value of the compressor is obtained. The compressor can be restored to normal operation by replacing the set compressor rotation speed value with the compressor rotation speed value.
It can be understood that, in practical application, it may also be determined whether the ambient temperature data is less than the third preset temperature, and when the ambient temperature data is less than the third preset temperature, it is determined whether the ambient temperature data is greater than the second preset temperature.
And step 216, calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor.
And step 217, acquiring the current environmental temperature data of the battery temperature management system.
This step may directly acquire the ambient temperature data at 210.
For example, when the ambient temperature data is high, the refrigerant in the cold coal pipe is mainly in a gaseous state, and at this time, the pressure of the refrigerant on the cold coal pipe is high, so that the stability of the battery temperature management system is greatly influenced. Therefore, a first preset temperature is set, which is a temperature threshold for judging whether the pressure of the cold coal pipe is too large. When the ambient temperature data is greater than the first preset temperature, it is determined that the pressure of the cold coal pipe needs to be reduced, and step 219 is performed. Otherwise, the pressure of the cold coal pipe is normal, and at this time, step 221 is executed.
The first preset temperature can be set according to actual conditions. In an embodiment, the first preset temperature is determined to be 30 ℃ in combination with each subset of temperatures.
And step 219, determining the PWM increment according to the environment temperature data. Step 220 is performed.
Specifically, when the ambient temperature data is greater than or equal to a first preset temperature, the PWM value is compensated. The compensation method specifically includes determining a PWM increment, and then adding the PWM increment to the PWM value calculated in step 217 to obtain a new PWM value.
It will be appreciated that the PWM increase amount may be determined by ambient temperature data. For example, when the ambient temperature data is greater than or equal to 30 ℃, 1% of the PWM value calculated in step 216 is taken as the PWM increase amount for every 1 ℃ higher than the first preset temperature. It is understood that 1 ℃ and 1% are only one optional data.
And step 220, performing forward compensation on the PWM value according to the PWM increment. Step 221 is performed.
Wherein, the forward compensation means that the PWM increase amount is added with the PWM value, and the addition result is taken as a new PWM value.
And step 221, controlling the compressor to operate according to the rotating speed value of the compressor, and controlling the fan to operate according to the PWM value of the fan so as to control the battery temperature management system.
According to the method, the instantaneous change parameter and the periodic change parameter of the inlet water temperature data are calculated to prejudge the inlet water temperature condition, so that the problem of hysteresis of the battery temperature management system is solved, and meanwhile, a specific model is not required to be established for a control algorithm of the battery temperature management system by setting the temperature subset, so that the complexity of the algorithm is greatly simplified, and the execution efficiency of the algorithm is improved. Meanwhile, the compressor can not be frequently closed and started when the temperature management is started and closed, the compressor is effectively protected, the starting temperature and the closing temperature of the compressor are prevented from adopting a unified set value, and when the balance point of the system is close to the temperature value, the system can be continuously opened and closed, so that the system can run more stably. And the mode of compensating the PWM value of the fan or changing the rotating speed value of the compressor through the environmental temperature data enhances the stability of the system, expands the working temperature (environmental temperature) range of the system and prolongs the service life of the compressor.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a control device of a battery temperature management system according to a third embodiment of the present application. Referring to fig. 4, the battery temperature management system control device provided in the present embodiment includes: a data acquisition module 301, a parameter calculation module 302, a rotational speed value determination module 303, an adjustment value determination module 304, and an operation control module 305.
The data acquisition module 301 is configured to acquire water inlet temperature data of the battery temperature management system; a parameter calculating module 302, configured to calculate, according to the inlet water temperature data, an instantaneous variation parameter and a periodic variation parameter of the inlet water temperature of the battery temperature management system; a rotation speed value determining module 303, configured to determine a compressor rotation speed value of the battery temperature management system according to the instantaneous change parameter and the periodic change parameter; an adjustment value determining module 304, configured to calculate a PWM value of the fan of the battery temperature management system according to the rotation speed value of the compressor; and the operation control module 305 is used for controlling the operation of the compressor according to the rotating speed value of the compressor and controlling the operation of the fan according to the PWM value of the fan so as to realize the control of the battery temperature management system.
The technical scheme includes that instantaneous change parameters and periodic change parameters of inlet water temperature are obtained by obtaining inlet water temperature data of the battery temperature management system, then the rotating speed value of the compressor is determined according to the instantaneous change parameters and the periodic change parameters, the fan PWM value of the battery temperature management system is calculated according to the rotating speed value of the compressor, the compressor is controlled to operate according to the rotating speed value of the compressor, and the fan is controlled to operate according to the fan PWM value. The water temperature can be pre-judged through the instantaneous change parameters and the periodic change parameters, and the accuracy of the water-cooled battery thermal management system in temperature control is further ensured.
On the basis of the foregoing embodiment, the adjustment value determining module 304 is specifically configured to: calculating the fan PWM value by using the formula of y-Kx + B, wherein y is the fan PWM value, x is the compressor rotation speed value,
PWMHfor maximum PWM value of fan, PWMLIs the minimum PWM value of the fan, VHIs the maximum value of the speed of rotation, V, of the compressorLIs the lowest rotating speed value of the compressor,
on the basis of the above embodiment, the method further comprises the following steps: the first temperature acquisition module is used for acquiring the current environmental temperature data of the battery temperature management system after calculating the PWM value of the fan of the battery temperature management system according to the rotating speed value of the compressor; the PWM increment determining module is used for determining the PWM increment according to the environment temperature data if the environment temperature data is greater than a first preset temperature; and the PWM compensation module is used for carrying out forward compensation on the PWM value according to the PWM increment.
On the basis of the above embodiment, the rotation speed value determination module 303 includes: the set determining unit is used for determining a temperature subset to which the inlet water temperature data belongs in an inlet water temperature set; the rule determining unit is used for acquiring a compressor rotating speed calculation rule of the temperature subset; and the rotating speed value calculating unit is used for determining the rotating speed value of the compressor of the battery temperature management system according to the instantaneous change parameter, the periodic change parameter and the rotating speed calculating rule of the compressor.
On the basis of the above embodiment, the method further includes: the first judgment module is used for judging whether the periodic variation parameter is greater than a first variation rate threshold value or not after the compressor rotating speed value of the battery temperature management system is determined according to the instantaneous variation parameter and the periodic variation parameter; the rotating speed value increasing module is used for increasing the rotating speed value of the compressor if the rotating speed value is larger than the first change rate threshold value; the second judgment module is used for judging whether the periodic variation parameter is smaller than a second variation rate threshold value if the periodic variation parameter is smaller than the first variation rate threshold value, and the second variation rate threshold value is smaller than the first variation rate threshold value; and the rotating speed value reducing module is used for reducing the rotating speed value of the compressor if the rotating speed value is smaller than the second change rate threshold value.
On the basis of the above embodiment, the method further includes: the second temperature acquisition module is used for acquiring the current environmental temperature data of the battery temperature management system; and the first rotating speed value replacing module is used for replacing the rotating speed value of the compressor by adopting the lowest rotating speed value of the compressor if the environment temperature data is less than or equal to a second preset temperature.
On the basis of the above embodiment, the method further includes: the third judging module is used for judging whether the rotating speed value of the compressor is greater than the set rotating speed value of the compressor or not if the environmental temperature data is greater than or equal to a third preset temperature, and the third preset temperature is higher than the second preset temperature; and the second rotating speed value replacing module is used for replacing the rotating speed value of the compressor by adopting the set rotating speed value of the compressor if the rotating speed value is larger than the set rotating speed value of the compressor.
The battery temperature management system control device provided by this embodiment is included in the battery temperature management system control device, and may be used to execute the battery temperature management system control method provided by any of the above embodiments, and has corresponding functions and beneficial effects.
Example four
Fig. 5 is a schematic structural diagram of a control device of a battery temperature management system according to a fourth embodiment of the present application. Specifically, as shown in fig. 5, the battery temperature management system control apparatus includes a processor 40, a memory 41, an input device 42, and an output device 43; the number of the processors 40 in the battery temperature management system control device may be one or more, and one processor 40 is taken as an example in fig. 5; the processor 40, the memory 41, the input device 42, and the output device 43 in the battery temperature management system control apparatus may be connected by a bus or other means, and fig. 5 illustrates an example of connection by a bus.
The memory 41 serves as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules in the control method of the battery temperature management system in the embodiment of the present application (for example, the data acquisition module 301, the parameter calculation module 302, the rotation speed value determination module 303, the adjustment value determination module 304, and the operation control module 305 in the control device of the battery temperature management system). The processor 40 executes various functional applications and data processing of the battery temperature management system control device by executing software programs, instructions and modules stored in the memory 41, that is, implements the battery temperature management system control method provided by any of the above embodiments.
The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the battery temperature management system control device, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to the battery temperature management system control device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The battery temperature management system control device comprises the battery temperature management system control device provided by the third embodiment, can be used for executing the battery temperature management system control method provided by any embodiment, and has corresponding functions and beneficial effects.
EXAMPLE five
Embodiments of the present application also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a battery temperature management system control method, the method including:
acquiring inlet water temperature data of a battery temperature management system;
calculating instantaneous change parameters and periodic change parameters of the inlet water temperature of the battery temperature management system according to the inlet water temperature data;
determining a compressor rotation speed value of a battery temperature management system according to the instantaneous change parameter and the periodic change parameter;
calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor;
and controlling the compressor to operate according to the rotating speed value of the compressor, and controlling the fan to operate according to the PWM value of the fan so as to realize control of the battery temperature management system.
Of course, the storage medium provided in the embodiments of the present application contains computer-executable instructions, and the computer-executable instructions are not limited to the method operations described above, and may also perform related operations in the battery temperature management system control method provided in any embodiments of the present application.
From the above description of the embodiments, it is obvious for those skilled in the art that the present application can be implemented by software and necessary general hardware, and certainly can be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, where the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk, or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute the control method of the battery temperature management system according to the embodiments of the present application.
It should be noted that, in the embodiment of the battery temperature management system control device, the included units and modules are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, specific names of the functional units are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the application.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (10)
1. A battery temperature management system control method is characterized by comprising the following steps:
acquiring inlet water temperature data of a battery temperature management system;
calculating instantaneous change parameters and periodic change parameters of the inlet water temperature of the battery temperature management system according to the inlet water temperature data;
determining a compressor rotation speed value of a battery temperature management system according to the instantaneous change parameter and the periodic change parameter;
calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor;
and controlling the compressor to operate according to the rotating speed value of the compressor, and controlling the fan to operate according to the PWM value of the fan so as to realize control of the battery temperature management system.
2. The battery temperature management system control method of claim 1, wherein the calculating the fan PWM value for the battery temperature management system from the compressor speed value comprises:
calculating the fan PWM value by using the formula of y-Kx + B, wherein y is the fan PWM value, x is the compressor rotation speed value,
PWMHfor maximum PWM value of fan, PWMLIs the minimum PWM value of the fan, VHIs the maximum value of the speed of rotation, V, of the compressorLIs the lowest rotating speed value of the compressor,
3. the battery temperature management system control method of claim 1, further comprising, after calculating the fan PWM value for the battery temperature management system based on the compressor speed value:
acquiring current environmental temperature data of the battery temperature management system;
if the environment temperature data is greater than a first preset temperature, determining a PWM increment according to the environment temperature data;
and carrying out forward compensation on the PWM value according to the PWM increment.
4. The battery temperature management system control method of claim 1, wherein the determining a compressor speed value for a battery temperature management system based on the instantaneous change parameter and the periodic change parameter comprises:
determining a temperature subset to which the inlet water temperature data belongs in an inlet water temperature set;
acquiring a compressor rotating speed calculation rule of the temperature subset;
and determining the compressor rotating speed value of the battery temperature management system according to the instantaneous change parameter, the periodic change parameter and the compressor rotating speed calculation rule.
5. The battery temperature management system control method of claim 4, after determining the compressor speed value of the battery temperature management system according to the instantaneous variation parameter and the periodic variation parameter, further comprising:
judging whether the periodic variation parameter is larger than a first variation rate threshold value;
if the value is larger than the first change rate threshold value, increasing the rotating speed value of the compressor;
if the change rate is smaller than the first change rate threshold, judging whether the periodic change parameter is smaller than a second change rate threshold which is smaller than the first change rate threshold;
and if the value is smaller than the second change rate threshold value, reducing the rotating speed value of the compressor.
6. The battery temperature management system control method of claim 1, wherein before calculating the fan PWM value of the battery temperature management system from the compressor speed value, further comprising:
acquiring current environmental temperature data of the battery temperature management system;
and if the environment temperature data is less than or equal to a second preset temperature, replacing the rotating speed value of the compressor with the lowest rotating speed value of the compressor.
7. The battery temperature management system control method according to claim 6, further comprising:
if the environmental temperature data is greater than or equal to a third preset temperature, judging whether the rotating speed value of the compressor is greater than the set rotating speed value of the compressor or not, wherein the third preset temperature is higher than the second preset temperature;
and if the rotating speed is greater than the set rotating speed value of the compressor, replacing the rotating speed value of the compressor with the set rotating speed value of the compressor.
8. A battery temperature management system control device, comprising:
the data acquisition module is used for acquiring inlet water temperature data of the battery temperature management system;
the parameter calculation module is used for calculating instantaneous change parameters and periodic change parameters of the inlet water temperature of the battery temperature management system according to the inlet water temperature data;
the rotating speed value determining module is used for determining a compressor rotating speed value of the battery temperature management system according to the instantaneous change parameter and the periodic change parameter;
the adjustment value determining module is used for calculating a fan PWM value of the battery temperature management system according to the rotating speed value of the compressor;
and the operation control module is used for controlling the operation of the compressor according to the rotating speed value of the compressor and controlling the operation of the fan according to the PWM value of the fan so as to realize the control of the battery temperature management system.
9. A battery temperature management system control apparatus, characterized by comprising:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the battery temperature management system control method of any of claims 1-7.
10. A storage medium containing computer-executable instructions for performing the battery temperature management system control method of any of claims 1-7 when executed by a computer processor.
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