CN111196125B - Vehicle-mounted air conditioner, operation method, control device and computer-readable storage medium - Google Patents
Vehicle-mounted air conditioner, operation method, control device and computer-readable storage medium Download PDFInfo
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- CN111196125B CN111196125B CN202010063663.3A CN202010063663A CN111196125B CN 111196125 B CN111196125 B CN 111196125B CN 202010063663 A CN202010063663 A CN 202010063663A CN 111196125 B CN111196125 B CN 111196125B
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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
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- 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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
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Abstract
The invention provides a vehicle-mounted air conditioner, an operation method, a control device and a computer-readable storage medium. The vehicle-mounted air conditioner comprises a power supply battery, a driving circuit and a load which are electrically connected, wherein a power switch is arranged in the driving circuit, and the operation method comprises the following steps: in response to an instruction to start the load, detecting an output current and an output voltage transmitted by a driving circuit to the load; performing voltage loop processing on the output voltage, and adjusting the given current according to a closed loop feedback result of the output voltage; and carrying out current loop processing on the output current, and adjusting the duty ratio of the power switch according to the closed loop feedback result of the output current and the output current. According to the technical scheme, the vehicle-mounted air conditioner can be prevented from being impacted by voltage and current, the service life of the vehicle-mounted air conditioner is prolonged, and the safety and stability degree of the vehicle-mounted air conditioner are improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a vehicle-mounted air conditioner, an operation method, a control device and a computer readable storage medium.
Background
In order to meet the voltage required for the operation of the load of the vehicle air conditioner, a structure such as a booster circuit is required to boost the low voltage of the battery power supply to a high voltage.
The related art has the defects that the load change in the starting process of the vehicle-mounted air conditioner is rapid, so that the vehicle-mounted air conditioner and a battery power supply of the vehicle-mounted air conditioner are easily impacted by voltage and current in the starting process of the vehicle-mounted air conditioner, and the service life and the safety and stability degree of the vehicle-mounted air conditioner are influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
To this end, a first object of the present invention is to provide an operation method of an in-vehicle air conditioner.
A second object of the present invention is to provide a control device for an in-vehicle air conditioner.
A third object of the present invention is to provide a vehicle air conditioner.
A fourth object of the present invention is to provide a computer-readable storage medium.
In order to achieve the first object of the present invention, an embodiment of the present invention provides an operation method of a vehicle-mounted air conditioner, where the vehicle-mounted air conditioner includes a power supply battery, a driving circuit, and a load, the power supply battery, the driving circuit, and the load are electrically connected, and the driving circuit is provided with a power switch, and the operation method includes: in response to an instruction to start the load, detecting an output current and an output voltage transmitted by a driving circuit to the load; performing voltage loop processing on the output voltage, and adjusting the given current according to a closed loop feedback result of the output voltage; and carrying out current loop processing on the output current, and adjusting the duty ratio of the power switch according to the closed loop feedback result of the output current and the output current.
According to the technical scheme, the current loop processing and the voltage loop processing are carried out on the output current and the output voltage transmitted to the load by the driving circuit in the starting process of the vehicle-mounted air conditioner, the output voltage and the output current are reasonably controlled, and the impact of the voltage and/or the current on the vehicle-mounted air conditioner and a power supply battery in the vehicle-mounted air conditioner is avoided in the process of sudden change of the load of the vehicle-mounted air conditioner, so that the service life of the vehicle-mounted air conditioner is prolonged, and the safety and stability degree of the vehicle-mounted air conditioner are improved.
In addition, the technical solution provided by the above embodiment of the present invention may further have the following additional technical features:
in the above technical solution, current loop processing is performed on the output current, and the duty ratio is adjusted according to the closed loop feedback result of the output current and the output current, which specifically includes: calculating a current deviation between the given current and the output current; and determining the boosting proportion of the output voltage according to the current deviation, and adjusting the duty ratio according to the boosting proportion.
Considering that the output current of the vehicle-mounted air conditioner is large and the variation fluctuation of the output current is large in the starting process, the duty ratio is determined according to the current deviation in the starting process of the vehicle-mounted air conditioner in the technical scheme so as to regulate the output current. By avoiding the violent fluctuation of the output current, the power device of the vehicle-mounted air conditioner can be effectively protected, and the starting and running stability of the vehicle-mounted air conditioner is improved.
In any of the above technical solutions, performing voltage loop processing on the output voltage, and adjusting the given current according to a closed loop feedback result of the output voltage specifically includes: calculating a voltage deviation between the given voltage and the output voltage; and carrying out proportional integral adjustment according to the voltage deviation to obtain the given current.
According to the technical scheme, the given current is obtained according to the closed loop feedback result of the voltage loop processing, and therefore the stability of the current output and the voltage output of the vehicle-mounted air conditioner is improved through the mutual matching of the voltage loop processing and the current loop processing
In any of the above technical solutions, the starting process of the load sequentially includes a power-on time, a starting time, an open-loop time, and a closed-loop time, the current loop processing is performed on the output current, and the duty ratio of the power switch is adjusted according to the closed-loop feedback result of the output current and the output current, and specifically includes: controlling the output current to be unchanged from the power-on time to the starting time; increasing the output current according to a first proportion from the starting time to the open loop time; increasing the output current according to a second proportion from the ring opening time to the ring closing time; in the first stage from the moment of the self-closing ring, the output current is controlled to be reduced; in the second stage from the moment of the self-closing loop, current loop processing is carried out, and the duty ratio of the power switch is adjusted to improve the output current; wherein the first ratio is greater than the second ratio.
According to the technical scheme, in the starting process of the vehicle-mounted air conditioner, the output current is correspondingly adaptively adjusted according to the change of the load of the vehicle-mounted air conditioner, so that the successful starting and stable operation of the load are further realized.
In any of the above technical solutions, the operation method of the vehicle air conditioner further includes: and in the process of starting the load, increasing the maximum threshold of the output current processed by the current loop according to the time sequence.
According to the technical scheme, the maximum threshold value which is sequentially increased according to the time sequence is set for the output current according to the load change characteristic of the vehicle-mounted air conditioner in the starting process, so that the operating efficiency of the vehicle-mounted air conditioner is further ensured on the basis of effectively protecting a power element of the vehicle-mounted air conditioner.
In any of the above technical solutions, the feedback frequency processed by the voltage loop is greater than the feedback frequency processed by the current loop.
According to the technical scheme, the feedback frequency processed by the current loop is set to be smaller than the feedback frequency processed by the voltage loop, so that the efficiency of calculation processing is improved on the basis of achieving the purpose of reducing noise.
In any of the above technical solutions, the feedback frequency processed by the current loop is an integer multiple of the feedback frequency processed by the voltage loop.
According to the technical scheme, the output voltage and the output current are jointly controlled conveniently according to the load change of the vehicle-mounted air conditioner in the starting process, so that the current change stability and the voltage change stability of the vehicle-mounted air conditioner in the starting process are improved.
To achieve the second object of the present invention, an embodiment of the present invention provides a control device of an in-vehicle air conditioner, including: a memory storing a computer program; a processor executing a computer program; wherein the processor, when executing the computer program, implements the steps of the method of operating the in-vehicle air conditioner according to any one of the embodiments of the present invention.
The control device of the vehicle-mounted air conditioner provided by the embodiment of the invention realizes the steps of the operation method of the vehicle-mounted air conditioner according to any embodiment of the invention, so that the control device of the vehicle-mounted air conditioner has all the beneficial effects of the operation method of the vehicle-mounted air conditioner according to any embodiment of the invention, and the description is omitted here.
To achieve the third object of the present invention, an embodiment of the present invention provides a vehicle air conditioner, and when the vehicle air conditioner operates, the steps of the operation method of the vehicle air conditioner according to any embodiment of the present invention are implemented.
The vehicle-mounted air conditioner provided by the embodiment of the invention realizes the steps of the operation method of the vehicle-mounted air conditioner according to any embodiment of the invention, so that the vehicle-mounted air conditioner has all the beneficial effects of the operation method of the vehicle-mounted air conditioner according to any embodiment of the invention, and the description is omitted here.
To achieve the fourth object of the present invention, an embodiment of the present invention provides a computer-readable storage medium including: the computer readable storage medium stores a computer program which, when executed, implements the steps of the operating method of the in-vehicle air conditioner according to any one of the embodiments of the present invention.
The computer-readable storage medium provided by the embodiment of the present invention implements the steps of the method for operating a vehicle-mounted air conditioner according to any embodiment of the present invention, and therefore, the method has all the advantages of the method for operating a vehicle-mounted air conditioner according to any embodiment of the present invention, and details thereof are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a first flowchart of an operation method of a vehicle air conditioner according to an embodiment of the present invention;
FIG. 2 is a flow chart of the current loop processing steps of one embodiment of the present invention;
FIG. 3 is a flow chart of voltage loop processing steps for one embodiment of the present invention;
FIG. 4 is a schematic diagram of the voltage loop process and current loop process of one embodiment of the present invention;
fig. 5 is a second flowchart of an operation method of the vehicle air conditioner according to the embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a variation process of an output current of a vehicle air conditioner during a load starting process according to an embodiment of the present invention;
fig. 7 is a system composition diagram of a control device of a vehicle air conditioner according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the names of the components in fig. 7 is:
100: control device for vehicle-mounted air conditioner, 110: memory, 120: a processor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The technical solutions of some embodiments of the present invention are described below with reference to fig. 1 to 7.
Embodiments of the present invention provide some in-vehicle air conditioners, operation methods, control apparatuses, and computer-readable storage media. The embodiment of the invention aims to control and regulate the current and the voltage of the vehicle-mounted air conditioner in the starting process so as to avoid current impact and voltage impact caused by overlarge load change of the vehicle-mounted air conditioner, thereby prolonging the service life of the vehicle-mounted air conditioner and improving the safety and stability of the vehicle-mounted air conditioner.
Specifically, during the process from standby to start and then from start to steady operation, the load change of the vehicle-mounted air conditioner is large and the load change is rapid. Therefore, a driving circuit for realizing the boosting or voltage doubling effect of the vehicle-mounted air conditioner is difficult to control, and the impact of voltage and/or current on the vehicle-mounted air conditioner and a power supply battery in the vehicle-mounted air conditioner is extremely easy to cause at the moment of sudden change of load, so that components in the vehicle-mounted air conditioner are damaged. Therefore, the embodiment of the invention provides a reasonable running method of the vehicle-mounted air conditioner aiming at the load characteristics and the change rule of the vehicle-mounted air conditioner so as to ensure the service life of the vehicle-mounted air conditioner and the safety and stability degree of the running.
Example 1:
as shown in fig. 1, the present embodiment provides an operation method of a vehicle-mounted air conditioner, where the vehicle-mounted air conditioner includes a power supply battery, a driving circuit and a load, the power supply battery, the driving circuit and the load are electrically connected, and the operation method includes:
step S102: in response to an instruction to start the load, detecting an output current and an output voltage transmitted by a driving circuit to the load;
step S104: performing voltage loop processing on the output voltage, and adjusting the given current according to a closed loop feedback result of the output voltage;
step S106: and carrying out current loop processing on the output current, and adjusting the duty ratio of the power switch according to the closed loop feedback result of the output current and the output current.
In the present embodiment, the in-vehicle air conditioner refers to an air conditioner product suitable for being mounted on a motor vehicle, and the working principle thereof is the same as or similar to that of a household air conditioner. The outdoor unit of the vehicle-mounted air conditioner is installed outside a cab of the motor vehicle, the indoor unit is installed inside the cab of the motor vehicle, and heat exchange and refrigeration of the inner space of the cab are realized through the circulating flow and continuous evaporation and condensation of the refrigerant in the refrigerant circulating pipeline. The power supply battery of the present embodiment may be an on-vehicle storage battery with a rated voltage of 12 volts to 48 volts.
The load of the present embodiment refers to an electric consumption element or an electric consumption device in the vehicle air conditioner, such as a compressor, an indoor fan, an outdoor fan, and the like. In order to meet the power supply requirement of the vehicle-mounted air conditioner load, the driving circuit is arranged between the power supply battery and the load, and the driving circuit is electrically connected with the power supply battery and the load respectively. The driving circuit is used for converting a low voltage provided by the power supply battery into a high voltage used by the load so as to drive the load to work stably. The power switch is used for controlling the voltage or current change rate of the vehicle-mounted air conditioner.
In order to achieve the purpose of improving the service life and the safety and stability of the vehicle-mounted air conditioner, when a load of the vehicle-mounted air conditioner is started, the real-time output current and the real-time output voltage transmitted to the load by the driving circuit are detected, and the voltage loop processing and the current loop processing are respectively performed on the output voltage and the output current. In the embodiment, a closed-loop feedback result is obtained through voltage loop processing, and the given current of the vehicle-mounted air conditioner is adjusted according to the closed-loop feedback result. On the basis, the embodiment further performs current loop processing on the output current, and adjusts the duty ratio of the power switch according to the closed loop feedback result of the current loop processing.
According to the embodiment, the double closed-loop control including the current loop and the voltage loop is performed on the output current and the output voltage transmitted to the load by the driving circuit in the starting process of the vehicle-mounted air conditioner, so that the service life and the safety and stability degree of the vehicle-mounted air conditioner are improved.
Example 2:
as shown in fig. 2, the present embodiment provides an operation method of an on-vehicle air conditioner, and in addition to the technical features of the above embodiment 1, the present embodiment further includes the following technical features:
carry out the current loop to output current to according to output current's closed loop feedback result and output current adjustment duty cycle, specifically include:
step S202: calculating a current deviation between the given current and the output current;
step S204: and determining the boosting proportion of the output voltage according to the current deviation, and adjusting the duty ratio according to the boosting proportion.
The present embodiment implements the current loop processing steps as step S202 and step S204 in the start-up and boosting processes of the vehicle air conditioner according to the load characteristics of the vehicle air conditioner. The given current of the present embodiment is also referred to as a reference current, and the output current of the present embodiment can be acquired by a current acquisition circuit. The present embodiment employs a given current as a given amount, constitutes a control deviation from a difference of the given amount and an actual output amount, and constitutes a control amount by linearly combining a proportion and an integral of the control deviation, thereby determining a step-up proportion of an output voltage from the current deviation to adjust a duty ratio according to the step-up proportion. It should be noted that, in the present embodiment, the adjustment parameters of the proportional-integral adjustment can be selected and adjusted by those skilled in the art according to actual needs.
The embodiment can improve the stability of the current output of the vehicle-mounted air conditioner, control the output current to present an expected waveform, avoid the severe fluctuation of the output current, reduce the heating loss of a power device in the vehicle-mounted air conditioner, effectively protect the power device and ensure the boosting efficiency of the vehicle-mounted air conditioner.
Example 3:
as shown in fig. 3, the present embodiment provides an operation method of a vehicle-mounted air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features:
voltage loop processing is carried out on the output voltage, and the given current is adjusted according to the closed loop feedback result of the output voltage, and the method specifically comprises the following steps:
step S302: calculating a voltage deviation between the given voltage and the output voltage;
step S304: and carrying out proportional integral adjustment according to the voltage deviation to obtain the given current.
The present embodiment implements the voltage loop processing steps as step S302 and step S304 in the starting and boosting processes of the vehicle air conditioner according to the load characteristics of the vehicle air conditioner. The given voltage of the present embodiment is also referred to as a reference voltage, and the output voltage of the present embodiment can be acquired by a voltage acquisition circuit. In the present embodiment, a given voltage is used as a given amount, a control deviation is formed from a difference between the given amount and an actual output amount, and a proportional and integral of the control deviation are linearly combined to form a control amount, whereby a given current is determined from the voltage deviation. It should be noted that, in the present embodiment, the adjustment parameters of the proportional-integral adjustment can be selected and adjusted by those skilled in the art according to actual needs.
Thus, the present embodiment can improve the degree of stability of the vehicle air conditioner voltage output. In addition, the present embodiment can also perform proportional-integral adjustment according to the voltage deviation to obtain a given current. In other words, in the present embodiment, the given current employed in the current loop process is obtained based on the result of the voltage loop process.
Specifically, as shown in fig. 4, in the present embodiment, the voltage detection link acquires the output voltage transmitted by the driving circuit to the load, performs a first calculation on the voltage deviation between the given voltage and the output voltage, and performs proportional-integral adjustment based on the result of the first calculation to obtain the given current. In addition, in the embodiment, the output current transmitted to the load by the driving circuit is collected through the current detection link, the current deviation between the given current and the output current is subjected to the second calculation, and the proportional-integral adjustment is performed based on the result of the second calculation to determine the boosting proportion of the output voltage. Subsequently, the present embodiment adjusts the duty ratio according to the boosting ratio by Pulse Width Modulation (PWM) to control the current loop controlled object and the voltage loop controlled object.
The embodiment improves the stability of the voltage output of the vehicle-mounted air conditioner through voltage loop processing. In addition, the present embodiment can also obtain a given current according to the result of the voltage loop processing. Therefore, in the embodiment, the voltage and the current of the vehicle-mounted air conditioner are coordinated to respectively reach respective optimal values within respective bearable ranges through the double closed-loop control of the mutual matching of the voltage loop processing and the current loop processing, so that the comprehensive efficiency of the vehicle-mounted air conditioning system reaches the optimal degree.
Example 4:
the present embodiment provides an operation method of a vehicle-mounted air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features:
the starting process of the load sequentially comprises a power-on moment, a starting moment, an open-loop moment and a closed-loop moment. As shown in fig. 5, performing current loop processing on the output current, and adjusting the duty ratio of the power switch according to the closed-loop feedback result of the output current and the output current specifically includes:
step S502: controlling the output current to be unchanged from the power-on time to the starting time;
step S504: increasing the output current according to a first proportion from the starting time to the open loop time;
step S506: increasing the output current according to a second proportion from the ring opening time to the ring closing time;
step S508: in the first stage from the moment of the self-closing ring, the output current is controlled to be reduced;
step S510: and in the second stage from the moment of the self-closing loop, current loop processing is carried out, and the duty ratio of the power switch is adjusted to improve the output current.
Wherein the first ratio is greater than the second ratio.
The purpose of the embodiment is to adaptively adjust the output current according to the change of the load of the vehicle-mounted air conditioner in the starting process of the vehicle-mounted air conditioner so as to realize the successful starting and stable operation of the load.
Hereinafter, a load variation tendency when the vehicle air conditioner is started will be described by taking an example of a change in power demand of the compressor during the start of the vehicle air conditioner.
During the process of switching the compressor from the stop state to the heavy load operation state, the power requirement of the compressor is rapidly switched. The switching process takes a very short time, typically between 1 second and a few seconds. The switching between the individual power demands is very rapid and each operating state lasts for a short time. In particular during the start-up phase, the operating conditions of the compressor undergo the following rapid changes: the compressor enters the power-on moment from the stop state, enters the starting moment from the power-on moment, enters the open-loop moment from the starting moment and enters the closed-loop moment from the open-loop moment. The open-loop time and the closed-loop time refer to the time when the compressor enters the open-loop control state and the time when the compressor enters the closed-loop control state. After the compressor enters the closed-loop control state, the operation state of the compressor also undergoes a change from the low-frequency operation state to the high-frequency operation state.
The above operation state change of the compressor correspondingly causes the load of the vehicle air conditioner to undergo the following changes: the load of the vehicle-mounted air conditioner is from no load to light load, from light load to large load, from large load to light load, from light load to heavy load.
In the above load change process, the present embodiment adaptively adjusts the output current through the voltage loop process and the current loop process.
Specifically, as shown in fig. 6, in the standby or off stage of the in-vehicle air conditioner, since the load such as the compressor or the fan is not started, the in-vehicle air conditioner at this stage has almost no load. And in the stage from the power-on moment to the starting moment, the vehicle-mounted air conditioner starts a boosting process, and the output current is controlled to be kept unchanged in the stage. Further, in a period from the start-up timing to the open-loop timing, the output current is gradually controlled according to the first ratio to be linearly raised. And then, in the stage from the open-loop moment to the closed-loop moment, continuously and gradually controlling the output current to linearly increase according to the second proportion. And finally, the vehicle-mounted air conditioner enters a closed loop moment. In the first stage from the moment of the self-closing ring, the running frequency of the compressor is low, the load is small, and therefore the output current is controlled to be gradually reduced. In the second stage from the moment of the self-closing loop, as the frequency of the compressor begins to rise and the load increases, the current loop processing is carried out to adjust the duty ratio of the power switch, so that the output current is controlled to rise gradually again.
Example 5:
the present embodiment provides an operation method of a vehicle-mounted air conditioner, and in addition to the technical features of any of the above embodiments, the present embodiment further includes the following technical features:
the operation method of the vehicle-mounted air conditioner further comprises the following steps: and in the process of starting the load, increasing the maximum threshold of the output current processed by the current loop according to the time sequence.
In consideration of the load variation characteristic of the vehicle air conditioner during the starting process, the embodiment needs to avoid the impact of the abrupt current change on the power element in the vehicle air conditioner. The excessive current surge can trigger an overcurrent protection mechanism of the vehicle-mounted air conditioner, so that power elements such as a compressor and the like are stopped. More seriously, the damage of the power element can be caused by overlarge current impact, the service life of the vehicle-mounted air conditioner is shortened, and the maintenance cost of the vehicle-mounted air conditioner is improved.
Therefore, the present embodiment sets a corresponding maximum threshold value for the output current according to the load variation characteristics of the vehicle air conditioner during the starting process. Specifically, as shown in fig. 6, in the phase from the power-on time to the start time, the output current remains unchanged, and the output current is relatively low, so the maximum threshold value of the output current is set to the first maximum threshold value in this phase. In the stage from the starting moment to the open loop moment, the output current is controlled to linearly increase by a first proportion, so that the maximum threshold value of the output current is set as a second maximum threshold value in the stage, wherein the second maximum threshold value is larger than the first maximum threshold value. And controlling the output current to continuously and linearly increase at a second proportion in a phase from the open loop time to the closed loop time, wherein the output current in the phase is relatively high, so that the maximum threshold value of the output current is set as a third maximum threshold value in the phase and after the phase, and the third maximum threshold value is larger than the second maximum threshold value and the first maximum threshold value.
Example 6:
an embodiment of the present invention provides an operation method of a vehicle-mounted air conditioner, which further includes the following technical features in addition to the technical features of any of the above embodiments:
the feedback frequency of the voltage loop processing is greater than the feedback frequency of the current loop processing.
If the feedback frequency of the current loop process is too high, the computational burden of the software system during the calculation process will be increased. Too low a feedback frequency of the current loop process results in increased noise in the calculation process. Therefore, the present embodiment sets the feedback frequency of the current loop processing to be smaller than the feedback frequency of the voltage loop processing, so as to improve the efficiency of the calculation processing on the basis of achieving the purpose of reducing noise.
Example 7:
an embodiment of the present invention provides an operation method of a vehicle-mounted air conditioner, which further includes the following technical features, in addition to the technical features of any of the above embodiments:
the feedback frequency of the current loop process is an integer multiple of the feedback frequency of the voltage loop process.
Specifically, the present embodiment may set the feedback frequency of the voltage loop process to 3 times the feedback frequency of the current loop process.
For example, the present implementation may set the feedback frequency of the current loop process to 18kHz and the feedback frequency of the voltage loop process to 6kHz.
The embodiment is convenient for carrying out combined control on the output voltage and the output current according to the load change of the vehicle-mounted air conditioner in the starting process, so as to realize the current change stability and the voltage change stability of the vehicle-mounted air conditioner in the starting process.
Example 8:
as shown in fig. 7, an embodiment of the present invention provides a control device 100 for an in-vehicle air conditioner, including: a memory 110 and a processor 120. The memory 110 stores a computer program; processor 120 executes computer programs; wherein, the processor 120, when executing the computer program, implements the steps of the operation method of the vehicle air conditioner according to any embodiment of the present invention.
Example 9:
the embodiment of the invention provides a vehicle-mounted air conditioner, and the steps of the operation method of the vehicle-mounted air conditioner in any embodiment of the invention are realized when the vehicle-mounted air conditioner operates.
Example 10:
an embodiment of the present invention provides a computer-readable storage medium, including: the computer-readable storage medium stores a computer program that, when executed, implements the steps of the operating method of the in-vehicle air conditioner according to any one of the embodiments of the present invention.
The specific embodiment is as follows:
the embodiment provides a vehicle-mounted air conditioner and an operation method thereof. It should be noted that, the present embodiment may be used to control the operation of an indoor unit of a vehicle-mounted air conditioner, and may also be used to control the operation of an outdoor unit of the vehicle-mounted air conditioner. The vehicle-mounted air conditioner comprises a power supply battery, a driving circuit and a load which are electrically connected, wherein a power switch is arranged in the driving circuit.
The embodiment can realize the control of the operation method of the vehicle-mounted air conditioner through the digital technology of the single chip microcomputer, so as to further overcome the defects of fixed control parameters and small control parameter adaptation range of the analog control technology on the basis of ensuring the advantages of the analog control technology.
In the starting process of the vehicle-mounted air conditioner load, the voltage loop processing is carried out on the output voltage and the current loop processing is carried out on the output current. Wherein, the voltage ring processing means: and calculating the voltage deviation between the given voltage and the output voltage, and performing proportional-integral adjustment according to the voltage deviation to obtain the given current. The current loop treatment refers to: and calculating the current deviation between the given current and the output current, determining the boosting proportion of the output voltage according to the current deviation, and further adjusting the duty ratio according to the boosting proportion. Therefore, the present embodiment can use a pulse width modulator or the like to generate the control pulse according to the obtained duty ratio to drive and control the power switch to operate.
This embodiment has adopted including voltage loop processing and electric current loop processing two closed-loop control modes of mutually supporting based on-vehicle air conditioner's load change characteristic to avoid the harm that voltage impact and electric current impact led to the fact on-vehicle air conditioner.
Specifically, the power supply battery of the vehicle air conditioner usually adopts a vehicle storage battery with a rated voltage of 12 volts to 48 volts, and the load is a high-power consumption element including a permanent magnet synchronous compressor or a fan. Therefore, the driving circuit of the vehicle air conditioner needs to realize a large degree of boosting driving action so as to meet the load power supply requirement of the vehicle air conditioner. In addition, when the vehicle air conditioner has large load fluctuation and/or torque compensation, the current fluctuation becomes more obvious, and the heating loss condition of a power device in the vehicle air conditioner is serious.
Considering that the output current of the vehicle-mounted air conditioner is large and the variation fluctuation of the output current is large in the starting process of the vehicle-mounted air conditioner, the current loop processing step is additionally arranged in the starting process of the vehicle-mounted air conditioner to limit the output current, so that the starting and running stability of the vehicle-mounted air conditioner is improved.
In consideration of the problem of heating loss of a power device in the vehicle-mounted air conditioner, the embodiment avoids fluctuation of output current as much as possible by adjusting the duty ratio when the load fluctuates. However, when the output current fluctuates sharply, the waveform of the output current is close to a trapezoidal wave. In such cases, the output current produces twice or more the effective heat generation on the power device than it would be if the current were stationary. Therefore, in the embodiment, a current loop processing step is added in the starting process of the vehicle-mounted air conditioner, so that the output current is controlled to present an expected waveform, severe fluctuation of the output current is avoided, the heating loss of a power device in the vehicle-mounted air conditioner is reduced, the power device is effectively protected, and the boosting efficiency of the vehicle-mounted air conditioner is ensured. In addition, in the embodiment, the voltage and the current of the vehicle-mounted air conditioner are coordinated to respectively reach respective optimal values within respective bearable ranges through the double closed-loop control in which the voltage loop processing and the current loop processing are matched with each other, so that the comprehensive efficiency of the vehicle-mounted air conditioning system reaches the optimal degree.
In summary, the embodiment of the invention has the following beneficial effects:
1. the embodiment of the invention provides a reasonable running method of the vehicle-mounted air conditioner aiming at the load characteristics and the change rule of the vehicle-mounted air conditioner so as to ensure the service life of the vehicle-mounted air conditioner and the safety and stability degree of the running.
2. According to the embodiment of the invention, through a double closed loop processing mode comprising current loop processing and voltage processing, on the basis of prolonging the service life and improving the safety and stability degree of the vehicle-mounted air conditioner, the output current is further reasonably limited, and severe fluctuation of the output current is effectively avoided.
3. The embodiment of the invention coordinates that the voltage and the current of the vehicle-mounted air conditioner respectively reach respective optimal values within respective bearable ranges through the mutual matching of the voltage loop processing and the current loop processing, so that the comprehensive efficiency of the vehicle-mounted air conditioner system reaches the optimal degree.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An operation method of a vehicle-mounted air conditioner is characterized in that the vehicle-mounted air conditioner comprises a power supply battery, a driving circuit and a load which are electrically connected, wherein a power switch is arranged in the driving circuit, and the operation method comprises the following steps:
detecting an output current and an output voltage transmitted to the load by the driving circuit in response to an instruction to start the load;
performing voltage loop processing on the output voltage, and adjusting the given current according to a closed loop feedback result of the output voltage;
carrying out current loop processing on the output current, and adjusting the duty ratio of a power switch according to a closed loop feedback result of the output current and the output current;
the starting process of the load sequentially comprises a power-on time, a starting time, an open-loop time and a closed-loop time, the current loop processing is carried out on the output current, and the duty ratio of the power switch is adjusted according to the closed-loop feedback result of the output current and the output current, and the method specifically comprises the following steps:
controlling the output current to be unchanged from the power-on time to the starting time;
increasing the output current according to a first proportion from the starting time to the open loop time;
increasing the output current according to a second proportion from the open-loop time to the closed-loop time;
controlling the output current to decrease in a first phase from the closed-loop moment;
in a second stage from the closed-loop moment, performing the current loop processing, and adjusting the duty ratio of the power switch to improve the output current;
wherein the first ratio is greater than the second ratio.
2. The operation method of the vehicle-mounted air conditioner according to claim 1, wherein the current loop processing is performed on the output current, and the duty ratio is adjusted according to the closed-loop feedback result of the output current and the output current, and specifically comprises:
calculating a current deviation between the given current and the output current;
and determining the boosting proportion of the output voltage according to the current deviation, and adjusting the duty ratio according to the boosting proportion.
3. The operation method of the vehicle-mounted air conditioner according to claim 1, wherein the performing voltage loop processing on the output voltage and adjusting the given current according to the closed-loop feedback result of the output voltage specifically comprises:
calculating a voltage deviation between a given voltage and the output voltage;
and carrying out proportional integral adjustment according to the voltage deviation to obtain the given current.
4. The operating method of the vehicle air conditioner according to any one of claims 1 to 3, further comprising:
and in the process of starting the load, increasing the maximum threshold of the output current processed by the current loop according to the time sequence.
5. The operating method of the vehicle air conditioner according to any one of claims 1 to 3,
and the feedback frequency processed by the voltage loop is greater than that processed by the current loop.
6. The operating method of the vehicle air conditioner according to any one of claims 1 to 3,
and the feedback frequency processed by the current loop is integral multiple of the feedback frequency processed by the voltage loop.
7. A control device for an in-vehicle air conditioner, comprising:
a memory storing a computer program;
a processor executing the computer program;
wherein the processor, when executing the computer program, implements the steps of the operating method of the in-vehicle air conditioner of any one of claims 1 to 6.
8. A vehicle-mounted air conditioner is characterized in that,
when the vehicle air conditioner is operated, the steps of the operation method of the vehicle air conditioner according to any one of claims 1 to 6 are realized.
9. A computer-readable storage medium, comprising:
the computer-readable storage medium stores a computer program which, when executed, implements the steps of the operating method of the in-vehicle air conditioner according to any one of claims 1 to 6.
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| CN113968123A (en) * | 2021-09-07 | 2022-01-25 | 一汽奔腾轿车有限公司 | External control variable displacement compressor opening and closing torque control system and method |
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