CN111391607B - Driving control method and device, air conditioner, vehicle and storage medium - Google Patents
Driving control method and device, air conditioner, vehicle and storage medium Download PDFInfo
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- CN111391607B CN111391607B CN202010219117.4A CN202010219117A CN111391607B CN 111391607 B CN111391607 B CN 111391607B CN 202010219117 A CN202010219117 A CN 202010219117A CN 111391607 B CN111391607 B CN 111391607B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005070 sampling Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 11
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000001514 detection method Methods 0.000 description 2
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- 238000012952 Resampling Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- Thermal Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a driving control method and device, an air conditioner, a vehicle and a storage medium. The driving control method comprises the following steps: acquiring a plurality of output voltage values of a power supply, which change along with time; obtaining an output voltage drop rate according to the plurality of output voltage values; the operating frequency of the load is adjusted according to the output voltage drop rate. By the method, the residual electric quantity of the battery can be judged more comprehensively, so that the running frequency of the load can be controlled more accurately, the battery pack is protected, and the running time of the load can be prolonged more reasonably.
Description
Technical Field
The present disclosure relates to the field of vehicle-mounted air conditioners, and more particularly, to a driving control method, a driving control device, an air conditioner, a vehicle, and a computer readable storage medium.
Background
The vehicle-mounted air conditioner is an air conditioning system generally used in a vehicle, has main components similar to those of a common air conditioner, and also comprises a compressor, a condenser, a throttling element, an evaporator, a fan and necessary control components, and is used for adjusting the temperature and the humidity in the vehicle and providing a comfortable environment for passengers.
When the automobile battery pack is used as the energy supply mode, the load of the vehicle-mounted air conditioner is large, so that the battery in the battery pack needs to be protected in the working process of the load, the battery is prevented from being damaged due to too low voltage, and the service time of the air conditioner is prolonged.
The current protection mode of the vehicle-mounted air conditioner for the battery is generally a mode of detecting the voltage of the battery, judging the electric quantity of the battery and then controlling the running frequency of the load. However, this method cannot fully determine the actual remaining condition of the battery power due to the nonlinear characteristic of the battery voltage with time and the characteristic of the battery capacity with use loss.
Disclosure of Invention
The present application aims to solve, at least to some extent, one of the technical problems in the related art. Therefore, the application provides a driving control method, a driving control device, an air conditioner, a vehicle and a computer readable storage medium, which can protect a battery and prolong the service time of the air conditioner.
In a first aspect, an embodiment of the present application provides a driving control method, including the steps of:
acquiring a plurality of output voltage values of a power supply, which change along with time;
obtaining an output voltage drop rate according to the plurality of output voltage values;
the operating frequency of the load is adjusted according to the output voltage drop rate.
According to the driving control method, the plurality of output voltage values of the power supply, which change along with time, are obtained, so that the real-time change along with time of the output voltage of the power supply can be obtained, the output voltage drop rate is obtained according to the plurality of output voltage values, namely, the drop rate of the output voltage of the power supply can be obtained according to the real-time change along with time of the output voltage of the power supply, and whether the power supply voltage is in an excessively low electric quantity state or in a low electric state can be judged by combining the power supply characteristics, so that the running frequency of a load is adjusted. Therefore, the power supply such as a battery can be avoided, the battery still bears the risk of damage caused by overdischarge of the battery when the electric quantity is too low, and the consumption of the battery can be reduced for example by adjusting the operation frequency of the load, so that the operation time of the load is prolonged.
In one embodiment of the present application, obtaining a plurality of output voltage values of a power supply over time includes: sampling is performed at a plurality of times, and a plurality of output voltage values corresponding to the plurality of times are obtained.
In one embodiment of the present application, the output voltage drop rate according to the plurality of output voltage values includes:
and obtaining the output voltage drop rate according to the voltage difference value between every two output voltage values of at least two continuous samples.
In one embodiment of the present application, deriving the output voltage drop rate from a plurality of output voltage values includes:
obtaining voltage difference increment between every two continuous voltage difference values according to the voltage difference values between every two continuous sampled output voltage values;
and obtaining the output voltage drop rate according to the voltage difference increment.
In one embodiment of the present application, determining an output voltage drop rate from a plurality of output voltage values includes:
obtaining a slope related to the voltage difference value according to the voltage difference value between at least two continuously sampled output voltage values and the sampling time interval between every two output voltage values;
the output voltage drop rate is obtained from the slope.
In one embodiment of the present application, adjusting the operating frequency of the load according to the output voltage drop rate includes: when the output voltage drop rate is larger than the first set value, the operation frequency of the load is reduced.
In one embodiment of the present application, adjusting the operating frequency of the load according to the output voltage drop rate includes: and when the continuous voltage differences are larger than the second set value, reducing the operating frequency of the load.
In one embodiment of the present application, adjusting the operating frequency of the load according to the output voltage drop rate includes: and when the continuous voltage difference increment is larger than the third set value, reducing the running frequency of the load.
In one embodiment of the present application, the method further comprises: and when the operating frequency of the load is the lowest operating frequency, if the output voltage drop rate is greater than the first set value, controlling the load to stop operating.
In a second aspect, an embodiment of the present application provides a drive control apparatus, including:
a memory configured to be adapted to store a computer program;
and a processor configured to execute the computer program to implement the drive control method as described above.
According to the driving control device, the processor executes the computer program stored in the memory to obtain a plurality of output voltage values of the power supply, so that the real-time change of the output voltage of the power supply along with time can be obtained, the output voltage drop rate is obtained according to the plurality of output voltage values, namely, the drop rate of the output voltage of the power supply can be obtained according to the real-time change of the output voltage of the power supply along with time, and whether the power supply voltage is in an excessively low electric quantity state or in a low electric state can be judged according to the power supply characteristics, so that the running frequency of a load is adjusted. Therefore, the power supply such as a battery can be avoided, the battery still bears the risk of damage caused by overdischarge of the battery when the electric quantity is too low, and the consumption of the battery can be reduced for example by adjusting the operation frequency of the load, so that the operation time of the load is prolonged.
In a third aspect, an embodiment of the present application provides an air conditioner, including:
a load; and
such as the drive control described above, which is connected to the load.
According to the air conditioner, the driving control device is operated to obtain a plurality of output voltage values of the power supply, which change along with time, so that real-time change of the output voltage of the power supply can be obtained, then the output voltage drop rate is obtained according to the plurality of output voltage values, namely, the drop rate of the output voltage of the power supply can be obtained according to the real-time change of the output voltage of the power supply along with time, and whether the power supply voltage is in an excessively low electric quantity state or in a low electric state can be judged by combining the power supply characteristics, so that the operating frequency of a load is adjusted. Therefore, the power supply such as a battery can be avoided, the battery still bears the risk of damage caused by overdischarge of the battery when the electric quantity is too low, and the consumption of the battery can be reduced for example by adjusting the operation frequency of the load, so that the operation time of the load is prolonged.
In a fourth aspect, embodiments of the present application provide a vehicle, including:
a battery pack; and
the driving control device is connected with the battery pack; or (b)
The air conditioner is connected with the battery pack.
In a fifth aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a drive control method as described above.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.
Fig. 1 shows a schematic graph of a voltage drop of a battery during discharge;
FIG. 2 shows a schematic diagram of the main component composition of a vehicle of one embodiment of the present application;
FIG. 3 illustrates a flow diagram of a drive control method of one embodiment of the present application;
fig. 4 shows a schematic flow chart of logic control of a drive control method according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It should be noted that although functional block diagrams are depicted as block diagrams, and logical sequences are shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the block diagrams in the system. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
At present, a vehicle-mounted air conditioner which is used in an automobile and takes a compressor as a main load can be driven to operate by an engine or can be driven to operate by a motor according to different driving types. When the air conditioner load is driven to operate by the motor, the energy source can come from a battery pack in the vehicle, such as a battery pack of an electric vehicle. In order to protect the battery in the battery pack from overdischarge, it is common to detect the battery voltage and then perform corresponding control measures. However, this method cannot fully determine the actual remaining condition of the battery power due to the nonlinear characteristic of the battery voltage with time and the characteristic of the battery capacity with use loss.
As shown in fig. 1, fig. 1 is a schematic graph of a decrease in battery voltage with discharge time during discharge of a battery. As the battery charge gradually decreases, the internally available electrolyte decreases, the chemical reaction time increases, and the output capacity decreases. It can be seen from the graph that the voltage drop over time is not uniform, i.e. the battery voltage is non-linear with the discharge time, and that the battery voltage drops more sharply from the opposite gentle slope section U as shown in FIG. 1 when the battery charge is depleted to some extent F U P Transition to steep section U P U L Wherein U is F Representing the voltage at full battery power, U P Representative of the location of an inflection point of a transition of a battery discharge curve from a gentle slope to a steep slope (without limiting the actual location or range of locations in which it may lie), U L Representing the voltage after the battery has been fully discharged.
In addition, after the same battery is used for a certain charge and discharge period, the capacity of the fully charged battery becomes smaller. The battery with reduced capacity due to the loss can reach its highest output voltage even after full charge, but the voltage drops rapidly due to the small capacity. As shown in fig. 1, the voltage profile for the battery also changes, such as a steep slope section U P U L Earlier would occur. Thus, if the existing voltage is adoptedIn the detection mode, misjudgment on the residual capacity can occur, for example, misjudgment on 80% of electric quantity corresponding to 24V voltage is performed. Therefore, the battery remaining capacity is judged only by detecting the battery voltage, and the problem of misjudgment is easy to occur, so that the actual remaining condition of the battery capacity cannot be comprehensively judged.
Based on this, the present application provides a drive control method, a drive control device, an air conditioner, a vehicle, and a computer readable storage medium, by obtaining a plurality of output voltage values of a power supply that change with time, thereby obtaining real-time changes of the output voltage of the power supply with time, and then obtaining an output voltage drop rate according to the plurality of output voltage values, that is, according to the real-time changes of the output voltage of the power supply with time, the drop rate of the output voltage of the power supply can be obtained, and by combining the power supply characteristics, it can be determined whether the power supply voltage is in an excessively low electric quantity or in a low electric state, thereby adjusting the operating frequency of the load. Therefore, the power supply such as a battery can be avoided, the battery still bears the risk of damage caused by overdischarge of the battery when the electric quantity is too low, and the consumption of the battery can be reduced for example by adjusting the operation frequency of the load, so that the operation time of the load is prolonged.
A drive control apparatus, a drive control method, an air conditioner, a vehicle, and a computer-readable storage medium according to an embodiment of the present application are described below with reference to fig. 2 to 4.
As shown in fig. 2, fig. 2 is a schematic view of a vehicle 1 provided in one embodiment of the present application.
In the embodiment of the present application, taking the vehicle 1 as an example, the vehicle 1 includes an air conditioner 10 and a battery pack 20, the air conditioner 10 is connected with the battery pack 20, and in the embodiment, the battery pack 20 is used as a power source for supplying power to the air conditioner 10. The air conditioner 10 includes a drive control device 101, and a load 102 connected to the drive control device 101, and the load 102 may include a compressor.
The drive control device 101 in the embodiment of the present application may be a device built in the air conditioner 10, or may be a device external to the air conditioner 10. The drive control device 101 includes: one or more processors 1011 and memory 1012, with one processor 1011 and one memory 1012 being illustrated in FIG. 2.
The processor 1011 and the memory 1012 may be connected by a bus or other means, not specifically shown in fig. 2 for simplicity.
Memory 1012, as a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. In addition, memory 1012 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 1012 may optionally include memory located remotely from processor 1011, which may be connected to the drive control 101 through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Optionally, the driving control device 101 may further include a short-range wireless communication module, a temperature sensor, a humidity sensor, a clock module, a display screen, control keys, and the like. The near field communication module can be a WIF I module or a Bluetooth module; in addition, when the display screen is a touch display screen, the control key may be a key function of the touch display screen.
It will be appreciated by those skilled in the art that the device configuration shown in fig. 2 is not limiting of the drive control device 101 and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
In some embodiments, an electric motor (not shown in fig. 2 for simplicity) may also be provided, coupled to the load 102 of the air conditioner 10 and the battery pack 20, respectively, to convert the electric power into kinetic energy for transfer to the load 102, such as a compressor.
In some embodiments, the battery pack 20 is connected to a drive control device 101, and the drive control device 101 may be connected to a load 102, such as a compressor, via a motor.
In the drive control apparatus 101 shown in fig. 2, the processor 1011 may be used to call a drive control program of an air conditioner stored in the memory 1012 and execute the steps of:
acquiring a plurality of output voltage values of the power supply, namely the battery pack 20, which change with time;
an output voltage drop rate according to the plurality of output voltage values;
the operating frequency of the load 102 is adjusted according to the output voltage drop rate.
In some embodiments, obtaining a plurality of output voltage values of a power supply over time includes: sampling is performed at a plurality of times, and a plurality of output voltage values corresponding to the plurality of times are obtained.
In some embodiments, obtaining a plurality of output voltage values of a power supply over time includes: sampling is performed at a plurality of times, and a plurality of output voltage values corresponding to the plurality of times are obtained.
In some embodiments, the output voltage drop rate from the plurality of output voltage values comprises: and obtaining the output voltage drop rate according to the voltage difference value between every two output voltage values of at least two continuous samples.
In some embodiments, the output voltage drop rate from the plurality of output voltage values comprises:
obtaining voltage difference increment between every two continuous voltage difference values according to the voltage difference values between every two continuous sampled output voltage values;
and obtaining the output voltage drop rate according to the voltage difference increment.
In some embodiments, determining the output voltage drop rate from the plurality of output voltage values includes:
obtaining a slope related to the voltage difference value according to the voltage difference value between at least two continuously sampled output voltage values and the sampling time interval between every two output voltage values;
the output voltage drop rate is obtained from the slope.
In some embodiments, adjusting the operating frequency of the load 102 according to the output voltage drop rate includes: when the output voltage drop rate is greater than the first set value, the operating frequency of the load 102 is reduced.
In some embodiments, adjusting the operating frequency of the load 102 according to the output voltage drop rate includes: when the continuous voltage differences are larger than the second set value, the operating frequency of the load 102 is reduced.
In some embodiments, adjusting the operating frequency of the load 102 according to the output voltage drop rate includes: when the continuous voltage difference increments are all greater than the third set value, the operating frequency of the load 102 is reduced.
In some embodiments, the method further comprises: when the operating frequency of the load 102 is the lowest operating frequency, if the output voltage drop rate is greater than the first set value, the load 102 is controlled to stop operating.
Referring to fig. 3, fig. 3 is a flowchart of a driving control method according to an embodiment of the present application, including, but not limited to, the following steps:
step S301, a plurality of output voltage values of the power supply varying with time are obtained.
In some embodiments, sampling is performed at a plurality of times, obtaining a plurality of output voltage values corresponding to the plurality of times. For example, in the case where the power source is the battery pack 20, at predetermined sampling time intervals Δt, respectively at T 1 、T 2 、…T n 、T n+ Sampling the output voltage of the battery pack 20 at the moment 1 (n is an integer greater than 0) to obtain output voltage values U respectively 1 、U 2 、…U n 、U n+ 1。
Step S302, output voltage drop rate is calculated according to the plurality of output voltage values.
In some embodiments, the output voltage drop rate is obtained from a voltage difference between at least two consecutive sampled output voltage values. For example, for a continuous sampled (T 1 、T 2 、…T n 、T n+ 1) I.e. output voltage values U obtained at the same time interval 1 、U 2 、…U n 、U n+ 1, calculating the voltage difference between every two of the two, for example: deltaU 1 ＝U 2 -U 1 ；ΔU 2 ＝U 3 -U 2 ；…ΔU n ＝U n+ 1-U n 。
In other embodiments, the voltage difference increment between every two continuous voltage differences can be obtained according to the voltage difference between every two continuous sampled output voltage values; and obtaining the output voltage drop rate according to the voltage difference increment. For example, for a continuous sampled (T 1 、T 2 、…T n 、T n+ 1、T n+ 2) The obtained output voltage value U 1 、U 2 、U 3 、…U n 、U n+ 1、U n+ 2, calculating the voltage difference between every two of the two, for example: deltaU 1 ＝U 2 -U 1 ；ΔU 2 ＝U 3 -U 2 ；ΔU 3 ＝U 4 -U 3 …ΔU n ＝U n+ 1-U n 、ΔU n+ 1＝U n+ 2-U n+ 1. Then, the increment of the voltage difference between every two continuous voltage differences, namely the difference of the voltage differences, is calculated, for example: delta DeltaU 1 ＝ΔU 2 -ΔU 1 ；ΔΔU 2 ＝ΔU 3 -ΔU 2 ；ΔΔU 3 ＝ΔU 4 -ΔU 3 ；…ΔΔU n ＝ΔU n+ 1-ΔU n 。
In still other embodiments, a slope is obtained for the voltage difference based on the voltage difference between at least two consecutive sampled output voltage values and the sampling time interval between the output voltage values; the output voltage drop rate is obtained from the slope. For example, for output voltage values U obtained by continuous sampling 1 、U 2 、…U n 、U n+ 1 according to the sampling time T 1 、T 2 、…T n 、T n+ 1, calculating the voltage falling slope k= (U) n+ 1-U n )/(T n+ 1-T n )。
Step S303 adjusts the operating frequency of the load 102 according to the output voltage drop rate.
In some embodiments, when the output voltage drop rate is greater than the first set value, the operating frequency of the load is reduced, and in the case where the load is the load 102 of the embodiment shown in fig. 2 and the load 102 is the compressor of the air conditioner 10, the operating frequency of the compressor is reduced. In other embodiments, the operating frequency of the load 102 is reduced when the output voltage drop rate is greater than or equal to the first set point. Thus, by reducing the operating frequency of the load 102, the discharge current of the battery pack 20 is reduced, thereby slowing down the rate of the output voltage drop of the battery pack 20, protecting the battery pack 20 and extending the use time of the air conditioner 10.
In some embodiments, when the voltage difference ΔU n If the output voltage is greater than the second set value Δl for the voltage difference, it may be determined that the output voltage drops too fast, and if the battery pack 20 is still running at the current frequency, it is easy to overdischarge, or it is unable to continue to provide enough power for the load 102 to run, resulting in unexpected or premature shutdown of the load 102, at this time, the running frequency of the load 102 may be reduced to reduce the consumption of the battery pack, so as to prolong the running time of the load 102 as much as possible, and protect the battery pack 20. The magnitude of the drop in the operating frequency of the load 102 may be determined according to actual needs, and is not limited in this application. By voltage difference DeltaU n And a corresponding second set value al, it is possible to calculate and determine whether the voltage drop at the preset time interval is excessive, for example, whether it is in a steep slope section in the battery level variation curve with time as shown in fig. 1, i.e., whether the battery pack 20 is in a low-power state.
In order to avoid that the accuracy of the judgment is affected by the interference of some factors, for example, the instantaneous voltage fluctuation caused by some reasons, but not the voltage drop caused by the continuous normal operation of various loads 102 in the vehicle, the judgment can be performed according to multiple comparison synthesis. In some embodiments, it is determined that the output voltage drops too fast, i.e., the output voltage drop rate is too high, when each of the consecutive x (1 < = x < = n+1) voltage differences is greater than the second set value Δl.
In some embodiments, when the voltage difference increases by ΔΔU n Greater than a third set point ΔΔl for voltage delta increments may reduce the operating frequency of load 102. By usingDelta U of voltage difference n And a corresponding third set value delta L, and can further judge whether the acceleration of the voltage dropping speed is too fast.
To avoid interference of some factors affecting the accuracy of the determination, similarly, in some embodiments, the output voltage drop rate is determined to be too high when each of the consecutive x (1 < = x < = n+1) voltage difference increments is greater than the third set value ΔΔl.
In some embodiments, when the voltage drop slope k is greater than the corresponding fourth set value k L The operating frequency of the load 102 may be reduced to reduce the consumption of the battery pack, thereby extending the operating time of the load 102 as much as possible and protecting the battery pack. Using the voltage drop slope k and the corresponding fourth set value k L The method is equivalent to deriving the amplitude of the output voltage according to time, and can sensitively sense the tiny change of the output voltage drop, so that the operation frequency of the load 102 can be controlled more timely, the battery pack 20 is protected, and the service time of the air conditioner 10 is prolonged.
In some embodiments, to avoid interference of some factors affecting the accuracy of the determination, similarly, when x (1<＝x<Each of the voltage drop slopes k obtained =n+1) times is greater than the corresponding fourth set value k L It is determined that the output voltage drop rate is too high.
In some embodiments, the first set point includes a second set point Δl, a third set point ΔΔl, a fourth set point k L May be empirical values, and are strongly correlated to the sampling time interval deltat. The sampling time interval Δt may be preset according to actual needs, and may be set to 1s, 5s, 10s, or other shorter or longer intervals, for example. Illustratively, the second set point Δl may be set by: for example, it is possible to control the voltage at full power according to the voltage of a secondary battery or a rechargeable battery (collectively referred to herein as a battery pack) equipped in a vehicle equipped with an in-vehicle air conditioner, and the voltage at low power (e.g., a gentle slope section U which can be regarded as a linear section approximately from that shown in fig. 1 F U P Transition to steep section U P U L Is the inflection point U of (1) P Voltage at, where U in the graph P Is used only in the position of (2)By way of illustration, and not representing actual position), the total allowable voltage difference may be calculated, and then the normal voltage drop rate per unit time (based on the approximate linear segment described above), for example, in mV/S, may be calculated based on the estimated total time that may be available for operation under normal full load operation (e.g., maximum operating current) of the air conditioner. Considering that the battery voltage drops slowly at full charge (e.g. gentle slope section U of fig. 1) F U P ) The low/low power drops rapidly (e.g. steep slope section U of FIG. 1) P U L ) The third and fourth setting DeltaDeltaDelta L, k can be set or derived in the above-mentioned manner L . The method of the embodiment of the application can eliminate the need to consider and detect the rated capacity, the actual capacity and the current capacity of the battery pack. If the current battery residual voltage is close to the full-charge voltage (can be preset according to the applicable battery specification without actual detection), and the voltage drop rate is higher than the set value, the battery pack loss can be further judged to be larger, the capacity is too small, and the user can be reminded of replacing the battery pack through indication.
In some embodiments, when the operating frequency of the load 102 is the lowest operating frequency, if the output voltage drop rate is greater than the first set value, the load 102 is controlled to stop operating. According to some embodiments described above, when the voltage drop rate is higher than the first set value, the operating frequency of the load 102 is reduced to reduce the consumption speed of the electric power, so that the voltage drop rate is not higher than the first set value. After a preset period of time, the next round of sampling and comparing may be performed, and if the voltage drop rate is still higher than the first set value, the operating frequency of the load 102 is further reduced until the voltage drop rate is not higher than the first set value. When the operating frequency of the load 102 drops to the lowest frequency and the voltage drop rate is still higher than the first set value, the load 102 is stopped, i.e. the compressor of the air conditioner 10 is turned off, so as to protect the battery pack 20 from overdischarging and prevent the load 102 from stopping operating in an unexpected manner, such as power failure due to insufficient power supply of the battery pack 20, resulting in failure of, for example, timely return of refrigerant to the compressor. Optionally, a corresponding low electrical indication is sent at the same time to remind the user to take the required measures.
According to the method of the embodiment of the application, the characteristic of nonlinearity of voltage change along with time in the discharging process of the battery pack is fully considered, and the characteristic of different voltage dropping speeds under different discharging current conditions is fully utilized. By the method of the above embodiment, on one hand, synchronization of discharge current and electrolyte chemical reaction time is ensured. On the other hand, the method can judge the residual battery capacity more comprehensively, avoid the problem that misjudgment is easy to occur only by detecting the battery voltage to judge the residual battery capacity, further control the running frequency of the load more accurately, protect the battery pack and prolong the running time more reasonably.
Referring to fig. 4, fig. 4 is a logic control schematic flow chart of a drive control method according to some embodiments of the present application, including, but not limited to, the following steps:
step S401, respectively at T 1 、T 2 、…T n 、T n+ Sampling the output voltage of the power supply at the moment 1 (n is an integer greater than 0) to respectively obtain output voltage values U 1 、U 2 、…U n 、U n+1 。
Step S4021, calculating a voltage difference DeltaU n ＝U n+1 -U n 。
Step S4031, determining whether each of the continuous x (1 < = x < = n) voltage differences is greater than the second set value Δl, if yes, performing the determination of step S404; if not, go to step S405.
Step S404, judging whether the current operating frequency of the load is the lowest allowable operating frequency, if so, executing step S406; if not, step S407 is performed.
Step S405, the load is continued to operate at the current operating frequency. Alternatively, it may return to step S401 to prepare for the next round of sampling, i.e., resampling the output voltage of the power supply after a preset period of time has elapsed and performing the remaining same steps.
Step S406, the load operation is stopped.
Step S407, reducing the operating frequency of the load.
According to the embodiment shown in fig. 2, in the case where the logical control of the drive control method is performed on the air conditioner 10 in the vehicle 1, the power source is the battery pack 20, and the load is the load 102 of the air conditioner, that is, the compressor.
In some embodiments, as shown in the portion of the flowchart indicated by the dashed line in fig. 4, steps S4021, S4031 may be replaced by steps S4022, S4032, as described below:
step S4022, calculating the voltage difference DeltaU n ＝U n+ 1-U n 、ΔU n+ 1＝U n+ 2-U n+ 1, then, the voltage difference delta U between every two voltage differences is calculated n ＝ΔU n+ 1-ΔU n 。
Step S4033, determining whether each of the consecutive x (1 < =x < =n) voltage differences is greater than the third set value ΔΔl, if yes, go to the judgment of step S404; if not, go to step S405.
In some embodiments, as shown in the part of the flowchart indicated by the dashed line in fig. 4, steps S4021 and S4031 may also be replaced by steps S4023 and S4033, as described below:
step S4023, calculating a voltage drop slope k= (U) n+ 1-U n )/(T n+ 1-T n )。
Step S4033, determining whether the voltage drop slope k is greater than the fourth set value k L If yes, go to the judgment of step S404; if not, go to step S405.
As shown in fig. 4, steps S4021 and S4031 may be combined according to actual needs; steps S4022 and S4032; any one, two or three of the calculation and judgment logics of the steps S4023 and S4033 are comprehensively judged, and the rest steps are executed according to the result of comprehensive judgment. In some embodiments, as long as at least ΔU is satisfied n >ΔL、ΔΔU n >ΔΔL、k>k L Any one of steps S404, S406, S407 is performed. In some embodiments, as long as at least ΔU is satisfied n >ΔL、ΔΔU n >ΔΔL、k>k L Any two of steps S404, S406, S407 are performed. In some embodiments, onlyAt the same time satisfy DeltaU n >ΔL、ΔΔU n >ΔΔL、k>k L Steps S404, S406, S407 are executed. Thereby more comprehensively judging the remaining power and performing the corresponding control.
Referring back to fig. 2, one embodiment of the present application further provides a drive control apparatus 101, including: a memory 1012 configured to be adapted to store a computer program; the processor 1011 is configured to execute the computer program to implement the driving control method as described above, and therefore, the driving control apparatus includes all the advantages of the driving control method as provided in any of the above embodiments, which are not described herein.
One embodiment of the present application also provides an air conditioner 10, comprising: a load 102; and a drive control device 101 connected to the load 102. Therefore, the air conditioner 10 includes all the advantages of the driving control method provided in any of the above embodiments, and will not be described herein.
One embodiment of the present application also provides a vehicle 1 including: a battery pack 20; and a drive control device 101 connected to the battery pack 20; or an air conditioner 10, is connected to the battery pack 20. Therefore, the vehicle 1 includes all the advantageous effects of the drive control method provided in any of the above embodiments, and will not be described in detail herein.
An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which when executed by a processor implements a drive control method as described above. Accordingly, the computer readable storage medium includes all the advantages of the drive control method as provided in any of the above embodiments, and will not be described in detail herein.
The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In this specification, a particular feature, structure, material, or characteristic described may be combined in any suitable manner in one or more embodiments or examples.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media
While the preferred embodiments of the present application have been described in detail, the present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (6)
1. A drive control method, characterized by comprising:
sampling at a plurality of moments in time to obtain a plurality of output voltage values corresponding to the moments in time, wherein the moments in time have the same sampling time interval, and the sampling time interval is determined based on the total operable time of the load at the maximum working current;
obtaining voltage difference increment between every two continuous voltage difference values according to the voltage difference values between every two continuous sampled output voltage values;
and reducing the operating frequency of the load when the voltage difference increments are each greater than a set point, wherein the set point is associated with the sampling time interval and is determined based on the allowed total voltage difference.
2. The drive control method according to claim 1, characterized by further comprising: and when the operating frequency of the load is the lowest operating frequency, if the voltage difference increment is larger than a set value, controlling the load to stop operating.
3. A drive control apparatus, characterized by comprising:
a memory configured to be adapted to store a computer program;
a processor configured to execute the computer program to implement the drive control method according to any one of claims 1 to 2.
4. An air conditioner, comprising:
a load; and
a drive control according to claim 3, which is connected to the load.
5. A vehicle, characterized by comprising:
a battery pack; and
the drive control device according to claim 3, connected to the battery pack; or (b)
The air conditioner of claim 4, connected to the battery pack.
6. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the drive control method according to any one of claims 1 to 2.
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| CN113602221B (en) * | 2021-08-25 | 2023-10-31 | 中国第一汽车股份有限公司 | Load power supply control method, device, equipment and storage medium |
| CN114216217B (en) * | 2021-12-02 | 2023-08-15 | 青岛海尔空调器有限总公司 | Method and device for adjusting power supply of air conditioner and air conditioner |
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| JP2010011567A (en) * | 2008-06-25 | 2010-01-14 | Shindengen Electric Mfg Co Ltd | Power supply device and control method of power supply device |
| CN110588284A (en) * | 2019-09-23 | 2019-12-20 | 广东美的制冷设备有限公司 | Operation control method, operation control device, air conditioner and computer readable storage medium |
| CN110758052A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Drive control method and device, air conditioning equipment, vehicle and storage medium |
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|---|---|---|---|---|
| JP2010011567A (en) * | 2008-06-25 | 2010-01-14 | Shindengen Electric Mfg Co Ltd | Power supply device and control method of power supply device |
| CN110588284A (en) * | 2019-09-23 | 2019-12-20 | 广东美的制冷设备有限公司 | Operation control method, operation control device, air conditioner and computer readable storage medium |
| CN110758052A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Drive control method and device, air conditioning equipment, vehicle and storage medium |
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