CN110949096A - Method and system for controlling rotating speed of automobile air conditioner compressor - Google Patents
Method and system for controlling rotating speed of automobile air conditioner compressor Download PDFInfo
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- CN110949096A CN110949096A CN201911046032.4A CN201911046032A CN110949096A CN 110949096 A CN110949096 A CN 110949096A CN 201911046032 A CN201911046032 A CN 201911046032A CN 110949096 A CN110949096 A CN 110949096A
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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
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
- B60H1/3208—Vehicle drive related control of the compressor drive means, e.g. for fuel saving purposes
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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 discloses a method and a system for controlling the rotating speed of an automobile air conditioner compressor, wherein the method comprises the following steps: when the air conditioner controller judges that the compressor meets the starting condition, a compressor starting request signal is sent to the vehicle control unit; the vehicle control unit sends a compressor starting permission signal to the air conditioner controller; the air conditioner controller sends a compressor starting and rotating speed instruction to the compressor, and adjusts the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature so as to enable the actual temperature of the evaporator to reach the target evaporator temperature. Compared with the existing compressor rotating speed control, the invention is more energy-saving and convenient.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a system for controlling the rotating speed of an automobile air conditioner compressor.
Background
The air conditioning system is an important component of an automobile, in a pure electric automobile, the energy consumption of the air conditioning system is the second level of the energy consumption of all systems, people often use the air conditioner in the automobile to refrigerate, and the compressor is the largest in refrigeration energy consumption.
At present, the air conditioning system on the market generally adopts a simple control method to control the rotating speed of a compressor, namely when a user selects an air conditioning temperature (or a refrigeration gear) and a wind speed gear, the compressor runs at a fixed rotating speed, the temperature in the vehicle is often low enough, but the compressor still runs at a higher rotating speed at the moment, the energy consumption is higher, the driving range of the electric vehicle is influenced, and if the rotating speed is reduced by manual adjustment, the inconvenience is brought to the user.
Disclosure of Invention
Therefore, the invention aims to provide a more energy-saving and convenient method for controlling the rotating speed of the automobile air conditioner compressor.
A method for controlling the rotating speed of an automobile air conditioner compressor comprises the following steps:
when the air conditioner controller judges that the compressor meets the starting condition, a compressor starting request signal is sent to the vehicle control unit;
the vehicle control unit sends a compressor starting permission signal to the air conditioner controller;
the air conditioner controller sends a compressor starting and rotating speed instruction to the compressor, and adjusts the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature so as to enable the actual temperature of the evaporator to reach the target evaporator temperature.
According to the method for controlling the rotating speed of the automobile air conditioner compressor, when the compressor meets the starting condition, the air conditioner controller adjusts the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature, so that the automatic adjustment of the rotating speed of the compressor is realized.
In addition, the method for controlling the rotating speed of the automobile air conditioner compressor, provided by the invention, can further have the following additional technical characteristics:
further, the method further comprises:
and when the calculated suction superheat degree of the compressor reaches a suction superheat degree threshold value, the air conditioner controller controls the speed increase rate of the compressor or the speed reduction of the compressor so as to enable the suction superheat degree of the compressor to be smaller than the suction superheat degree threshold value.
Further, the method further comprises:
the air conditioner controller judges that the compressor meets the starting condition according to the pressure of a refrigerant and the ambient temperature in the air conditioning system, and when the pressure of the refrigerant is within a pressure threshold range and the ambient temperature is higher than an ambient temperature threshold, the air conditioner controller judges that the compressor meets the starting condition and sends a compressor starting request signal to the vehicle control unit.
Further, the step of judging, by the air conditioner controller, that the compressor satisfies the start condition according to the pressure of the refrigerant in the air conditioning system and the ambient temperature specifically includes:
when an A/C button of the air conditioner controller is pressed, a temperature knob is set to be a refrigerating area, and an air volume gear is adjusted to be not 0, the air conditioner controller judges that the compressor meets a starting condition according to the pressure of a refrigerant in an air conditioning system and the ambient temperature, wherein when the temperature knob is set to be the refrigerating area, the compressor is in an allowable working state, and when the temperature knob is set to be the heating area, the compressor is in a forbidden working state.
Further, the target evaporator temperature is determined according to the current ambient temperature and the setting state of the temperature knob.
Further, the method further comprises:
and when the voltage range of the whole vehicle does not exceed the preset range and the battery power is higher than the power threshold value, the whole vehicle controller sends a compressor starting permission signal to the air conditioner controller.
The invention also aims to provide a more energy-saving and more convenient automobile air conditioner compressor rotating speed control system.
The utility model provides an automobile air conditioner compressor rotational speed control system, includes air conditioner controller, compressor, evaporimeter and vehicle control unit:
the air conditioner controller is used for sending a compressor starting request signal to the vehicle control unit when judging that the compressor meets a starting condition;
the vehicle control unit is used for sending a compressor starting permission signal to the air conditioner controller;
the air conditioner controller is used for sending a compressor starting and rotating speed instruction to the compressor, and adjusting the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature so as to enable the actual temperature of the evaporator to reach the target evaporator temperature.
According to the automobile air conditioner compressor rotating speed control system provided by the invention, when the compressor meets the starting condition, the air conditioner controller can adjust the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature, so that the automatic adjustment of the rotating speed of the compressor is realized.
In addition, the rotating speed control system of the automobile air conditioner compressor according to the invention can also have the following additional technical characteristics:
further, the air conditioner controller is used for simultaneously calculating the suction superheat degree of the compressor when adjusting the rotating speed of the compressor, and controlling the increasing rate of the rotating speed of the compressor or the rotating speed to be reduced when the calculated suction superheat degree of the compressor reaches a suction superheat degree threshold value, so that the suction superheat degree of the compressor is smaller than the suction superheat degree threshold value.
Further, the air conditioner controller is used for judging that the compressor meets the starting condition according to the pressure of a refrigerant in the air conditioning system and the ambient temperature, and when the pressure of the refrigerant is within the range of a pressure threshold value and the ambient temperature is higher than an ambient temperature threshold value, the air conditioner controller judges that the compressor meets the starting condition and sends a compressor starting request signal to the vehicle control unit.
Further, the air conditioner controller is used for judging that the compressor meets the starting condition according to the refrigerant pressure and the environment temperature in the air conditioning system when an A/C button of the air conditioner controller is pressed, the temperature knob is set to be a refrigerating area, and the air volume gear is adjusted to be a non-0 gear, wherein when the temperature knob is set to be the refrigerating area, the compressor is in an allowable working state, and when the temperature knob is set to be a heating area, the compressor is in an forbidden working state.
Further, the target evaporator temperature is determined according to the current ambient temperature and the setting state of the temperature knob.
Further, the vehicle control unit is used for sending a compressor starting permission signal to the air conditioner controller when the voltage range of the vehicle is not more than the preset range and the battery electric quantity is higher than the electric quantity threshold value.
Drawings
The above and/or additional aspects and advantages of embodiments 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 flowchart of a method for controlling the rotational speed of a compressor of an air conditioner for a vehicle according to a first embodiment of the present invention;
fig. 2 is a block diagram illustrating a rotational speed control system of a compressor of an air conditioner for a vehicle according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for controlling a rotational speed of a compressor of an air conditioner of an automobile according to a first embodiment of the present invention includes steps S101 to S103:
s101, when the air conditioner controller judges that the compressor meets the starting condition, a compressor starting request signal is sent to the whole vehicle controller;
among them, a conventional air conditioning system generally includes an evaporator, a condenser and a compressor which are connected in sequence in a circulating manner. For a conventional air conditioner controller, an a/C button, a temperature knob and an air volume gear are arranged on the controller, the a/C button is used for controlling whether refrigeration is started or not, and the temperature knob is used for controlling the degree of refrigeration (or heating). The air quantity gear is used for controlling the air quantity grade, generally comprises 0-5 grade, 0 grade represents no air outlet, 1-5 grade, the lower the grade is, the larger the air quantity is.
When an A/C button of the air conditioner controller is pressed down, a temperature knob is set to be a refrigerating area (namely 1-8 grades), and when an air volume gear is adjusted to be not 0 grade (any one of 1-5 grades), the air conditioner controller judges that the compressor meets a starting condition according to the pressure of a refrigerant in an air conditioning system and the ambient temperature, and the air conditioner controller can be specifically realized by arranging a pressure sensor and a temperature sensor at corresponding positions.
It should be noted that, unlike the conventional solution, in this embodiment, when the temperature knob is set to the cooling area, the compressor is in the operation-permitted state, and when the temperature knob is set to the heating area, the compressor is in the operation-prohibited state, so as to ensure more effective adjustment of the rotation speed of the compressor.
Specifically, the air conditioner controller judges that the compressor meets a starting condition according to the pressure of a refrigerant and the ambient temperature in the air conditioning system, and when the pressure of the refrigerant is within a pressure threshold range and the ambient temperature is higher than an ambient temperature threshold, the air conditioner controller judges that the compressor meets the starting condition and sends a compressor starting request signal to a VCU (vehicle control unit). On the contrary, if the refrigerant pressure exceeds the pressure threshold range (i.e. the pressure is too high or too low), or the ambient temperature is lower than the ambient temperature threshold (the current ambient temperature is very low), at this time, the starting condition of the compressor is not satisfied, a compressor starting request signal is not sent to the VCU of the vehicle control unit, and the compressor is not controlled to start.
S102, the vehicle control unit sends a compressor starting permission signal to the air conditioner controller;
when the voltage range of the whole vehicle does not exceed a preset range (the voltage is in a normal range) and the battery electric quantity is higher than an electric quantity threshold value (the electric quantity is enough), the whole vehicle controller sends a compressor starting permission signal to the air conditioner controller. On the contrary, if the voltage range of the whole vehicle exceeds the preset range (the voltage is not in the normal range) or the battery power is lower than the power threshold (the power is insufficient), the whole vehicle controller does not send a compressor starting permission signal to the air conditioner controller.
S103, the air conditioner controller sends a compressor starting and rotating speed instruction to the compressor, and the rotating speed of the compressor is adjusted by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature, so that the actual temperature of the evaporator reaches the target evaporator temperature.
And the target evaporator temperature is determined according to the current environment temperature and the temperature knob setting state. For example, the following table shows preset target evaporator temperatures, and in the specific implementation, the target evaporator temperature can be determined by obtaining the current ambient temperature and the setting state of the temperature knob (i.e., 1-8 th), and by looking up the following table, for example, when the setting state of the temperature knob is 4 th, the current ambient temperature is 32 ℃, the target evaporator temperature is 5 ℃, and at this time, the rotating speed of the compressor is adjusted by using a PID control algorithm according to the difference between the current actual evaporator temperature (which is actually measured, for example, 15 ℃) and the obtained target evaporator temperature of 5 ℃, so that the actual temperature of the evaporator reaches the target evaporator temperature of 5 ℃.
The target evaporator temperature in the following table is obtained according to a large amount of measured data, and under the condition of meeting the target evaporator temperature in the following table, the air outlet temperature required by a user can be met, the power consumption balance of the compressor can be considered, and the rotating speed of the compressor is kept in a proper state.
Further, as a specific example, the air conditioning controller simultaneously calculates a suction superheat of the compressor while adjusting the rotation speed of the compressor, and controls the rate of increase of the rotation speed of the compressor or the decrease of the rotation speed so that the suction superheat of the compressor is less than a suction superheat threshold value when the calculated suction superheat of the compressor reaches the suction superheat threshold value. The superheat degree is usually controlled to be 3 ℃ or higher, and if the superheat degree approaches 3 ℃, the rate of increase of the compressor rotation speed or the rotation speed should be decreased, and the rotation speed of the compressor is controlled by the suction superheat degree of the compressor, so that the compressor refrigerant liquid slugging can be prevented.
According to the method for controlling the rotating speed of the automobile air conditioner compressor, when the compressor meets the starting condition, the air conditioner controller can adjust the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature, so that the rotating speed of the compressor is automatically adjusted.
Referring to fig. 2, based on the same inventive concept, a system for controlling a rotational speed of a compressor of an air conditioner of an automobile according to a second embodiment of the present invention includes an air conditioner controller 10, a compressor 20, an evaporator 30, and a vehicle controller 40.
The air conditioner controller 10 is configured to send a compressor start request signal to the vehicle control unit 40 when it is determined that the compressor 20 meets the start condition;
the vehicle control unit 40 is configured to send a compressor start permission signal to the air conditioner controller 10;
the air conditioner controller 10 is configured to send a compressor start and rotation speed instruction to the compressor 20, and adjust the rotation speed of the compressor 20 by using a PID control algorithm according to a difference between a current actual evaporator temperature and a preset target evaporator temperature, so that the actual temperature of the evaporator 30 reaches the target evaporator temperature.
In this embodiment, the air conditioner controller 10 is configured to simultaneously calculate the suction superheat of the compressor when adjusting the rotation speed of the compressor 20, and when the calculated suction superheat of the compressor reaches a suction superheat threshold, control the rotation speed increase rate of the compressor 20 to decrease or the rotation speed to decrease so that the suction superheat of the compressor is less than the suction superheat threshold.
In this embodiment, the air conditioner controller 10 is configured to determine that the compressor 20 meets the starting condition according to refrigerant pressure and an ambient temperature in the air conditioning system, and when the refrigerant pressure is within a pressure threshold range and the ambient temperature is higher than an ambient temperature threshold, the air conditioner controller 10 determines that the compressor 20 meets the starting condition, and sends a compressor start request signal to the vehicle control unit 40.
In this embodiment, the air conditioner controller 10 is configured to determine that the compressor meets the start condition according to refrigerant pressure and ambient temperature in the air conditioning system when an a/C button of the air conditioner controller 10 is pressed, and the temperature knob is set to a refrigeration area, and the air volume gear is adjusted to a non-0 gear, where the compressor is in an allowable working state when the temperature knob is set to the refrigeration area, and the compressor is in an prohibited working state when the temperature knob is set to the heating area.
In this embodiment, the target evaporator temperature is determined according to the current ambient temperature and the temperature knob setting state.
In this embodiment, the vehicle controller 40 is configured to send a compressor start-up permission signal to the air conditioner controller 10 when the vehicle voltage range does not exceed the preset range and the battery power is higher than the power threshold.
According to the automobile air conditioner compressor rotating speed control system provided by the embodiment, when the compressor meets the starting condition, the air conditioner controller can adjust the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature, so that the rotating speed of the compressor is automatically adjusted.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit of a logic gate circuit specifically used for realizing a logic function for a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A method for controlling the rotating speed of an automobile air conditioner compressor is characterized by comprising the following steps:
when the air conditioner controller judges that the compressor meets the starting condition, a compressor starting request signal is sent to the vehicle control unit;
the vehicle control unit sends a compressor starting permission signal to the air conditioner controller;
the air conditioner controller sends a compressor starting and rotating speed instruction to the compressor, and adjusts the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature so as to enable the actual temperature of the evaporator to reach the target evaporator temperature.
2. The method for controlling the rotation speed of the compressor of the air conditioner of the automobile as claimed in claim 1, further comprising:
and when the calculated suction superheat degree of the compressor reaches a suction superheat degree threshold value, the air conditioner controller controls the speed increase rate of the compressor or the speed reduction of the compressor so as to enable the suction superheat degree of the compressor to be smaller than the suction superheat degree threshold value.
3. The method for controlling the rotation speed of the compressor of the air conditioner of the automobile as claimed in claim 1, further comprising:
the air conditioner controller judges that the compressor meets the starting condition according to the pressure of a refrigerant and the ambient temperature in the air conditioning system, and when the pressure of the refrigerant is within a pressure threshold range and the ambient temperature is higher than an ambient temperature threshold, the air conditioner controller judges that the compressor meets the starting condition and sends a compressor starting request signal to the vehicle control unit.
4. The method for controlling the rotating speed of the automobile air conditioner compressor according to claim 3, wherein the step of judging that the compressor meets the starting condition by the air conditioner controller according to the pressure of a refrigerant in an air conditioning system and the ambient temperature specifically comprises the following steps of:
when an A/C button of the air conditioner controller is pressed, a temperature knob is set to be a refrigerating area, and an air volume gear is adjusted to be not 0, the air conditioner controller judges that the compressor meets a starting condition according to the pressure of a refrigerant in an air conditioning system and the ambient temperature, wherein when the temperature knob is set to be the refrigerating area, the compressor is in an allowable working state, and when the temperature knob is set to be the heating area, the compressor is in a forbidden working state.
5. The method as claimed in claim 1, wherein the target evaporator temperature is determined according to a current ambient temperature and a temperature knob setting state.
6. The method for controlling the rotation speed of the compressor of the air conditioner of the automobile as claimed in claim 1, further comprising:
and when the voltage range of the whole vehicle does not exceed the preset range and the battery power is higher than the power threshold value, the whole vehicle controller sends a compressor starting permission signal to the air conditioner controller.
7. The utility model provides an automobile air conditioner compressor rotational speed control system which characterized in that, includes air conditioner controller, compressor, evaporimeter and vehicle control unit:
the air conditioner controller is used for sending a compressor starting request signal to the vehicle control unit when judging that the compressor meets a starting condition;
the vehicle control unit is used for sending a compressor starting permission signal to the air conditioner controller;
the air conditioner controller is used for sending a compressor starting and rotating speed instruction to the compressor, and adjusting the rotating speed of the compressor by adopting a PID control algorithm according to the difference value between the current actual evaporator temperature and the preset target evaporator temperature so as to enable the actual temperature of the evaporator to reach the target evaporator temperature.
8. The system for controlling the rotation speed of the compressor of the air conditioner of the automobile as claimed in claim 7, wherein:
the air conditioner controller is used for simultaneously calculating the suction superheat degree of the compressor when adjusting the rotating speed of the compressor, and controlling the rotating speed increasing rate of the compressor to be reduced or the rotating speed to be reduced when the calculated suction superheat degree of the compressor reaches a suction superheat degree threshold value, so that the suction superheat degree of the compressor is smaller than the suction superheat degree threshold value.
9. The system for controlling the rotation speed of the compressor of the air conditioner of the automobile as claimed in claim 7, wherein:
the air conditioner controller is used for judging that the compressor meets the starting condition according to the pressure of a refrigerant and the ambient temperature in the air conditioning system, and when the pressure of the refrigerant is within the range of a pressure threshold value and the ambient temperature is higher than an ambient temperature threshold value, the air conditioner controller judges that the compressor meets the starting condition and sends a compressor starting request signal to the vehicle control unit.
10. The system for controlling the rotation speed of the compressor of the air conditioner of the automobile as claimed in claim 9, wherein:
the air conditioner controller is used for judging that the compressor meets the starting condition according to the refrigerant pressure and the environment temperature in the air conditioning system when an A/C button of the air conditioner controller is pressed down, the temperature knob is set to be a refrigerating area, and the air volume gear is adjusted to be not 0, wherein when the temperature knob is set to be the refrigerating area, the compressor is in an allowable working state, and when the temperature knob is set to be a heating area, the compressor is in a forbidden working state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911046032.4A CN110949096A (en) | 2019-10-30 | 2019-10-30 | Method and system for controlling rotating speed of automobile air conditioner compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911046032.4A CN110949096A (en) | 2019-10-30 | 2019-10-30 | Method and system for controlling rotating speed of automobile air conditioner compressor |
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| CN201911046032.4A Pending CN110949096A (en) | 2019-10-30 | 2019-10-30 | Method and system for controlling rotating speed of automobile air conditioner compressor |
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Cited By (5)
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| CN112829547A (en) * | 2021-01-13 | 2021-05-25 | 东风汽车股份有限公司 | Air conditioner control method of electric vehicle |
| CN112829546A (en) * | 2021-01-04 | 2021-05-25 | 宝能(西安)汽车研究院有限公司 | Control method of vehicle air conditioning system and vehicle air conditioning system |
| CN113511048A (en) * | 2020-12-25 | 2021-10-19 | 北汽福田汽车股份有限公司 | Control system of constant displacement compressor |
| CN114347758A (en) * | 2021-04-01 | 2022-04-15 | 长城汽车股份有限公司 | Automobile air conditioner compressor control method |
| CN115200287A (en) * | 2021-04-13 | 2022-10-18 | 合肥美的电冰箱有限公司 | Control method and device of compressor and refrigeration equipment |
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Application publication date: 20200403 |