CN113928086A - High-efficiency electric compressor rotating speed control method based on evaporator temperature control - Google Patents
High-efficiency electric compressor rotating speed control method based on evaporator temperature control Download PDFInfo
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- CN113928086A CN113928086A CN202111254225.6A CN202111254225A CN113928086A CN 113928086 A CN113928086 A CN 113928086A CN 202111254225 A CN202111254225 A CN 202111254225A CN 113928086 A CN113928086 A CN 113928086A
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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
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
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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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- Air-Conditioning For Vehicles (AREA)
Abstract
The invention relates to a high-efficiency electric compressor rotating speed control method based on evaporator temperature control, which comprises the following steps: establishing a numerical simulation model through the bench test data of the conventional whole vehicle cooling and air conditioning system, inquiring meteorological data, performing numerical simulation on the typical environmental working condition and the typical use working condition of the three seasons of spring, summer and autumn, and correcting the numerical simulation model; establishing a relation between evaporator temperature and vehicle load according to the change rule of the evaporator temperature before and after the operation of each working condition air conditioner of the vehicle within a certain time T, and determining the initial compressor rotating speed and the target temperature of a subsequent evaporator; adjusting the rotating speed of the compressor according to the given target temperature of the evaporator to enable the actual evaporator temperature to be stabilized within a specified range of the target evaporator temperature; the invention has the beneficial effects that: on the premise of not increasing hardware cost, the advantage of rotation speed control of the electric control compressor is fully exerted, so that the running characteristic of the system is efficiently matched with the real-time load requirement of the whole vehicle.
Description
Technical Field
The invention relates to the field of compressor control, in particular to a high-efficiency electric compressor rotating speed control method based on evaporator temperature control.
Background
Along with the deepening of the whole vehicle electromotion process, more and more fuel vehicle air conditioning system platforms need to consider, and in the process of changing oil into electricity, the compressor is changed into the switching problem of electric drive of a controller from the original direct mechanical drive of an engine through a transmission belt. The rotating speed of the traditional automobile air conditioner compressor is changed along with the rotating speed of an engine, and the control is simple, but the accurate control cannot be realized. In the process of changing oil into electricity, higher requirements are put on the control of the electric air-conditioning compressor, but space for optimizing and improving the system is also brought. At present, an electric air conditioner on the market generally directly determines a constant compressor rotating speed according to a temperature or air volume knob gear, or roughly determines a target evaporation temperature and an initial compressor rotating speed by supplementing outdoor temperature and air volume/temperature gear signals, and then adjusts the compressor rotating speed according to the difference value of the actual evaporator temperature and the target evaporator temperature. The former control is too simple, and the latter system is too complicated, needs higher cost input, but also fails to further improve the high-efficiency comfortable intelligence degree of the control mode.
Generally, the electric compressor runs at a fixed rotating speed, so that the whole air conditioner has poor running comfort and high energy consumption, and mileage anxiety is increased; the variable-speed operation often lacks the sunlight intensity signal and the disadvantage of a compensation algorithm, and even if the local complexity of the system is increased (an environment temperature sensor and the like are additionally added), the advantage of the rotation speed control of the electric control compressor cannot be fully exerted, so that the operation characteristic of the system is efficiently matched with the real-time load requirement of the whole vehicle.
Disclosure of Invention
In order to solve the problems, the invention provides an efficient electric compressor rotating speed control method based on evaporator temperature control, which discards the defects on the basis of a general electric air conditioner control method, optimizes the control method mainly by analyzing the existing test data and numerical simulation analysis on the premise of not increasing the hardware cost, and provides the efficient electric compressor rotating speed control method based on evaporator temperature control.
The heat load of the whole vehicle mainly comes from the heat convection of hot air outside the vehicle and the heat radiation of the sun, the target temperature of the evaporator is determined by using the environment temperature generally, only the influence of the hot air outside the vehicle is considered, the solar radiation is not considered, the inaccuracy of control is easily caused, and drivers and passengers are inevitably required to intervene to frequently adjust through a control panel. The control method provided by the invention comprehensively considers the load of the whole vehicle, and the heat convection of hot air outside the vehicle and the heat radiation of the sun are reflected on the temperature change of the evaporator before and after the operation of the air conditioner for a certain time; meanwhile, the unique algorithm avoids the misjudgment of the heat load of the whole vehicle possibly caused by the low evaporator temperature when the air conditioner is started for the second time in a short time;
the invention provides a high-efficiency electric compressor rotating speed control method based on evaporator temperature control, which comprises the following steps:
s101: establishing a numerical simulation model through the bench test data of the conventional whole vehicle cooling and air conditioning system, inquiring meteorological data, and performing numerical simulation on the typical environmental working conditions and the typical use working conditions in the three seasons of spring, summer and autumn;
s102: establishing a relation between evaporator temperature and vehicle load according to the change rule of the evaporator temperature before and after the operation of each working condition air conditioner of the vehicle within a certain time T, and determining the initial compressor rotating speed and the subsequent initial evaporator target temperature;
s103: and adjusting the rotating speed of the compressor according to the given target temperature of the evaporator to ensure that the actual evaporator temperature is stabilized within the specified range of the target evaporator temperature.
The beneficial effects provided by the invention are as follows: the air-conditioning electric compressor always runs at a rotating speed which just meets the thermal load of the whole vehicle at that time, so that the characteristics of high efficiency and energy saving are embodied, the problem of frequent start and stop under partial working conditions of the traditional mechanical compressor can be avoided, the problem of liquid impact of the air suction of the compressor with liquid is effectively prevented, and the system runs more stably and comfortably; on the premise of not increasing hardware cost, the advantage of rotation speed control of the electric control compressor is fully exerted, so that the running characteristic of the system is efficiently matched with the real-time load requirement of the whole vehicle.
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FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
A high-efficiency electric compressor rotating speed control method based on evaporator temperature control comprises the following steps:
s101: establishing a numerical simulation model according to the existing vehicle cooling and air conditioning system bench test data; as an example, the present invention is exemplified by a hydrogen fuel cell vehicle.
The thermal load of the vehicle under the design working condition is 4kw, and the vehicle is matched with a 27cc electric compressor (the rotating speed is between 1000 and 6000 rpm). According to the test data and the simulation result, a relational expression of the evaporator temperature Te (DEG C) after the whole vehicle is stable in idle sunning, the sunlight intensity I (w/square meter) and the environment temperature Tw can be fitted, wherein the relational expression is as follows:
Te＝0.028I+Tw (Te≥25)
s102: establishing a relation between evaporator temperature and vehicle load according to the change rule of the evaporator temperature before and after the operation of each working condition air conditioner of the vehicle within a certain time T, and determining the initial compressor rotating speed and the target temperature of a subsequent evaporator;
before the whole vehicle is started, judging and determining the initial compressor rotating speed through the current temperature of the evaporator, and operating for a certain time T according to the initial compressor rotating speed, so as to determine the target temperature of the evaporator;
the specific rule for determining the target temperature of the evaporator is as follows: if the current temperature of an evaporator is lower than a preset first threshold value before the whole vehicle is started, the initial compressor rotating speed runs for a period of time T at a preset fixed rotating speed; if the current temperature of the evaporator is higher than or equal to a preset first threshold value before the whole vehicle is started, directly determining the target temperature of a subsequent evaporator according to the current temperature of the evaporator;
when the temperature of the evaporator rises within the operation T time and reaches the maximum value, if the maximum value of the temperature of the evaporator is larger than a preset second threshold value, the maximum value of the temperature of the evaporator is used for re-determining the new target temperature of the evaporator; and if the maximum evaporator temperature is less than or equal to a preset second threshold, determining the target temperature of the subsequent evaporator according to the current evaporator temperature before starting.
The summary is as follows:
if the current temperature of the evaporator is higher than or equal to a preset first threshold value, the subsequent evaporator target is determined directly according to the current evaporator temperatureThe temperature is calculated by the following method: tm 0.0023 Te2-0.3654 × Te + 17.382; te is the current evaporator temperature, and Tm is the target evaporator temperature;
when the current temperature of the evaporator is lower than a preset first threshold value, the initial compressor rotating speed runs for a period of time T at a preset fixed rotating speed, so that the temperature of the evaporator is increased, and when the maximum value of the increased temperature is larger than a preset second threshold value, the maximum value of the evaporator temperature is used for re-determining a new target evaporator temperature; the specific calculation method comprises the following steps: tm 0.0023 Te2-0.3654 × Te +17.382- (Tmax-Te); where Te is a preset second threshold.
When the maximum value of the increased temperature is less than or equal to a preset second threshold value, the target temperature of the subsequent evaporator is determined by directly using the current temperature of the evaporator before starting, and the calculation method comprises the following steps: tm 0.0023 Te2-0.3654*Te+17.382；
As an embodiment, it can be known from the model established in S101 that, after the air is sunned for several hours and the heat transfer between the inside and outside of the vehicle is stable, the entire vehicle can be regarded as a heat source with a stable temperature Te, if the inside of the vehicle needs to be cooled to a comfortable temperature Tn (the comfortable temperature of the human body is in the range of about 20-26 ℃, 23 ℃ is taken after simplification, this value is a set value, and can be set according to actual needs), the refrigerating capacity q (w) provided by the air conditioning system needs to be calculated by the numerical value of the entire vehicle, and the black box expression fitted by the result is:
Q＝69*(Te-Tn)+904＝69*(Te-23)+904＝69*Te-683
te is more than or equal to 25,25 is also a set value, the set value is set according to actual needs, if the actual evaporator temperature is lower than 25 ℃ (namely the first threshold value), the air conditioner is judged to be started for the second time in a short time, and the temperature cannot represent the idle drying temperature at the moment, and is substituted by 25 ℃ uniformly;
after the required refrigerating capacity is known, the current air quantity qve (m) of the blower is fed back according to the controller3H) and fitting relation formula of steady-state refrigerating capacity of air conditioning system, rotating speed N (rpm) of compressor and air quantity of blower
Q＝-(-0.00000000000641*qve^3+0.0000000056*qve^2-0.00000135*qve+0.00016424)*N^2+(-0.000000035*qve^3+0.00003*qve^2-0.0053*qve+0.9763)*N+(0.00004*qve^3-0.03601*qve^2+8.5581*qve-357.93)；
The compressor starting speed of the air conditioning system can be controlled to operate according to the obtained value of the rotating speed N, and if the rotating speed of the compressor exceeds 1000-6000rpm, the compressor is controlled by the adjacent limit rotating speed. After 90 seconds of operation at this speed, if the initial evaporator temperature is greater than 30 ℃ (i.e., the first threshold described above), then the following is calculated as the target evaporator temperature:
Tm＝0.0023*Te2-0.3654 × Te +17.382 (rounding off after decimal point, round up)
And comparing the actual evaporator temperature to perform PI automatic adjustment on the rotating speed of the compressor.
If the initial evaporator temperature is not more than 30 ℃ and the maximum value Tmax of the actual evaporation temperature in the initial 90 seconds is larger than the initial evaporation temperature when the air conditioner is started, the target evaporator temperature is followed
Tm＝0.0023*Te2-0.3654 × Te +17.382- (Tmax-Te), Te being a preset second threshold; the result is rounded off after the decimal point and rounded up.
The method can avoid the interference of the short-time secondary startup of the air conditioning system to the target evaporation temperature setting.
S103: and adjusting the rotating speed of the compressor according to the given target temperature of the evaporator to ensure that the actual evaporator temperature is stabilized within the specified range of the target evaporator temperature.
In step S103, the strategy for adjusting the rotation speed of the compressor is specifically: and performing PI automatic adjustment on the rotating speed of the compressor according to the difference value between the actual evaporator temperature and the target evaporator temperature.
In addition, in the embodiment, the meteorological rules are not superposed, so that in the application, the numerical simulation is carried out on the typical environmental working condition and the typical use working condition in the three seasons of spring, summer and autumn by inquiring meteorological data, and the numerical simulation model is corrected;
as another example, if the air conditioner is operated for a long time (more than 1 hour), the environment (ambient temperature and sunlight intensity) changes due to time change, and the corresponding actual temperature of the air-drying evaporator has changed, but since the air conditioner is always in operation, there is no real-time temperature data of the air-drying evaporator. Therefore, the target evaporation temperature needs to be corrected according to a meteorological model established in advance, when the air conditioner is continuously operated between 9 and 17 points (the environmental change is small in other time periods, the correction is not needed, and the time node is inquired by a controller through a vehicle can signal), 1-degree target evaporation temperature needs to be reduced every 1 hour before 13 points, and 1-degree target evaporation temperature needs to be increased every 1 hour after 13 points.
The calculated target evaporation temperature is the target when the temperature knob is the middle gear of refrigeration, and the thermal comfort is subjective feeling, for example, after a driver and a passenger adjust the temperature gears according to the subjective feeling of the driver and the passenger, the target evaporation temperature corresponding to each target temperature gear needs to be adjusted synchronously. The hydrogen fuel cell vehicle has 5 refrigeration gears in total, and the final target evaporator temperatures T corresponding to the temperature gears from high to low (target temperature is low) are respectively Tm +2, Tm +1, Tm, Tm-1 and Tm-2. And finally, the target evaporator temperature T is limited by the anti-frosting strategy, and if the calculated value is less than 1 ℃, the control is carried out according to 1 ℃.
In conclusion, the beneficial effects of the invention are as follows: the air conditioner electric compressor always runs at a rotating speed just meeting the thermal load of the whole vehicle at that time, so that the characteristics of high efficiency and energy saving are reflected, the problem of frequent start and stop under the partial working condition of the traditional mechanical compressor can be avoided, the problem of liquid impact caused by air suction and liquid carrying of the compressor is effectively prevented, and the system is more stable and comfortable to run.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A high-efficiency electric compressor rotating speed control method based on evaporator temperature control is characterized in that: the method comprises the following steps:
s101: establishing a numerical simulation model through the bench test data of the conventional whole vehicle cooling and air conditioning system, inquiring meteorological data, performing numerical simulation on the typical environmental working condition and the typical use working condition of the three seasons of spring, summer and autumn, and correcting the numerical simulation model;
s102: establishing a relation between evaporator temperature and vehicle load according to the change rule of the evaporator temperature before and after the operation of each working condition air conditioner of the vehicle within a certain time T, and determining the initial compressor rotating speed and the target temperature of a subsequent evaporator;
s103: and adjusting the rotating speed of the compressor according to the given target temperature of the evaporator to ensure that the actual evaporator temperature is stabilized within the specified range of the target evaporator temperature.
2. A method of controlling the rotational speed of a high efficiency electric compressor based on evaporator temperature control as set forth in claim 1, wherein: step S102 specifically includes:
before the whole vehicle is started, the initial compressor rotating speed is determined through the current temperature judgment of the evaporator, and the vehicle runs for a certain time T according to the initial compressor rotating speed, so that the target temperature of the evaporator is determined.
3. A method of controlling the rotational speed of a high efficiency electric compressor based on evaporator temperature control as set forth in claim 2, wherein: the specific rule for determining the target temperature of the evaporator is as follows: if the current temperature of an evaporator is lower than a preset first threshold value before the whole vehicle is started, the initial compressor rotating speed runs for a period of time T at a preset fixed rotating speed; if the current temperature of the evaporator is higher than or equal to a preset first threshold value before the whole vehicle is started, directly determining the target temperature of a subsequent evaporator according to the current temperature of the evaporator;
when the temperature of the evaporator rises within the operation T time and reaches the maximum value, if the maximum value of the temperature of the evaporator is larger than a preset second threshold value, the maximum value of the temperature of the evaporator is used for re-determining the new target temperature of the evaporator; and if the maximum evaporator temperature is less than or equal to a preset second threshold, determining the target temperature of the subsequent evaporator according to the current evaporator temperature before starting.
4. A method of controlling the rotational speed of a high efficiency electric compressor based on evaporator temperature control as set forth in claim 1, wherein: in step S103, the strategy for adjusting the rotation speed of the compressor is specifically: and performing PI automatic adjustment on the rotating speed of the compressor according to the difference value between the actual evaporator temperature and the target evaporator temperature.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040206102A1 (en) * | 2003-04-16 | 2004-10-21 | Toshinobu Homan | Air conditioner with control of compressor |
| JP2008201335A (en) * | 2007-02-22 | 2008-09-04 | Denso Corp | Vehicular air-conditioner |
| KR20120099968A (en) * | 2011-03-02 | 2012-09-12 | 한라공조주식회사 | Control method of a compressor of air conditioner for vehicle |
| JP2013151181A (en) * | 2012-01-24 | 2013-08-08 | Denso Corp | Motor-driven compressor that controls temperature of evaporator in vehicle air-conditioner |
| CN109808445A (en) * | 2019-01-10 | 2019-05-28 | 奇瑞汽车股份有限公司 | A kind of compressor rotary speed control method of on-board air conditioner |
| CN112160900A (en) * | 2020-08-31 | 2021-01-01 | 上汽通用五菱汽车股份有限公司 | Compressor speed regulation method, system, equipment and storage medium |
-
2021
- 2021-10-27 CN CN202111254225.6A patent/CN113928086B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040206102A1 (en) * | 2003-04-16 | 2004-10-21 | Toshinobu Homan | Air conditioner with control of compressor |
| JP2008201335A (en) * | 2007-02-22 | 2008-09-04 | Denso Corp | Vehicular air-conditioner |
| KR20120099968A (en) * | 2011-03-02 | 2012-09-12 | 한라공조주식회사 | Control method of a compressor of air conditioner for vehicle |
| JP2013151181A (en) * | 2012-01-24 | 2013-08-08 | Denso Corp | Motor-driven compressor that controls temperature of evaporator in vehicle air-conditioner |
| CN109808445A (en) * | 2019-01-10 | 2019-05-28 | 奇瑞汽车股份有限公司 | A kind of compressor rotary speed control method of on-board air conditioner |
| CN112160900A (en) * | 2020-08-31 | 2021-01-01 | 上汽通用五菱汽车股份有限公司 | Compressor speed regulation method, system, equipment and storage medium |
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