CN115384275B - Dual-compressor direct driving device for electric automobile thermal management system and control method - Google Patents
Dual-compressor direct driving device for electric automobile thermal management system and control method Download PDFInfo
- Publication number
- CN115384275B CN115384275B CN202210994584.3A CN202210994584A CN115384275B CN 115384275 B CN115384275 B CN 115384275B CN 202210994584 A CN202210994584 A CN 202210994584A CN 115384275 B CN115384275 B CN 115384275B
- Authority
- CN
- China
- Prior art keywords
- compressor
- motor
- management system
- thermal management
- rotating speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims description 79
- 230000009977 dual effect Effects 0.000 claims description 16
- 238000005057 refrigeration Methods 0.000 claims description 14
- 238000004378 air conditioning Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 description 19
- 238000001816 cooling Methods 0.000 description 10
- 230000007613 environmental effect Effects 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000006244 Medium Thermal Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
-
- 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
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a double-compressor direct driving device for an electric automobile thermal management system and a control method, wherein the double-compressor direct driving device comprises the following components: a motor (1), a motor controller (2), a first compressor (3), a second compressor (4), a first compressor clutch (7), a second compressor clutch (8), a first motor drive shaft (9) and a second motor drive shaft (10); the motor controller (2) is connected with the motor (1); the motor (1) is connected with the first compressor clutch (7) and the second compressor clutch (8) through the first motor driving shaft (9) and the second motor driving shaft (10) respectively; the first compressor clutch (7) is connected to the first compressor (3); the second compressor clutch (8) is connected to the second compressor (4).
Description
Technical Field
The invention relates to the field of electric automobile thermal management, in particular to a double-compressor direct driving device for an electric automobile thermal management system and a control method.
Background
As the charging time of electric vehicles is required to be shorter and shorter, the charging power is larger and larger, and more refrigerating capacity of the automobile thermal management system is required to balance the heat generated by quick charging. There are 2 ways to increase the cooling capacity of the heat management system, one is to increase the displacement of the compressor, thereby increasing the cooling capacity of the system. However, the scheme can cause the control problem of the system under the low-load working condition, and has obvious defects; another effective solution is to add a compressor system to the system that is specifically responsible for battery cooling. However, the use of two motor compressors can place cost pressure on the automobile plant due to the high price of the motor compressors.
Patent document CN113511043a (application number: 202110517330.8) discloses a dual compressor electric car thermal management system comprising: the system comprises a carbon dioxide thermal management module and a second working medium thermal management module, wherein the carbon dioxide thermal management module is used for heating a cockpit and cooling a power battery, and the second working medium thermal management module is used for refrigerating the cockpit. The patent mainly teaches a car thermal management system employing two refrigerants and two compressors, and the invention mainly teaches a specific method of how to drive the two compressors with one motor and to achieve the satisfaction of the thermal load requirements for the refrigerating capacity of the compressor's corresponding system.
Patent document CN215292792U (application number: 202120984130.9) discloses a single motor driven double air compressor unit structure, which comprises a bracket, a motor, two air compressors and two groups of driving belts, wherein the bracket is provided with three platforms which are stacked at intervals in sequence; the motor is fixed on a platform in the middle, a rotating wheel is arranged at the end part of an output shaft of the motor, and two groups of limiting grooves are formed in the rotating wheel; the two air compressors are respectively fixed on the upper platform and the lower platform; one group of transmission belts are sleeved in the main shaft turntable and one group of limiting grooves of the upper air compressor, and the other group of transmission belts are sleeved in the main shaft turntable and the other group of limiting grooves of the lower air compressor. The patent is used in the field of air compressors, and the invention is used in the field of automotive air conditioning compressors; the purpose of this patent is only to reduce the installation space, the two compressors can only work together, or shut down together. Meanwhile, the patent adopts a fixed-rotation-speed motor, and the displacement of the compressor cannot be controlled.
Patent document CN108621748a (application number: 201810440516.6) discloses a dual compressor air conditioning control system for a refrigerated compartment, comprising: the air conditioner comprises a first compressor, a second compressor, an air conditioner controller and a driving device which is linked with an engine; the air conditioner controller controls the driving device to start and stop; the started driving device enables the engine to indirectly drive the first compressor to work and/or the second compressor to work. The patent is used for refrigerating a carriage of a refrigerated vehicle, and the purpose of the double compressors is to solve the problem that the refrigerating capacity of a single compressor is insufficient when the vehicle is idling; the invention is used for refrigerating the passenger cabin of the electric automobile and refrigerating the power battery. The control object and the control method are completely different. The patent engine is used as power, and the rotating speed of the compressor is regulated through an intermediate driving mechanism; the invention uses the motor as power and directly drives the compressor through the motor shaft. And the two structures are very different.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a double-compressor direct driving device and a control method for an electric automobile thermal management system.
According to the present invention, there is provided a dual compressor direct drive apparatus for an electric vehicle thermal management system, comprising: a motor 1, a motor controller 2, a first compressor 3, a second compressor 4, a first compressor clutch 7, a second compressor clutch 8, a first motor drive shaft 9, and a second motor drive shaft 10;
the motor controller 2 is connected with the motor 1; the motor 1 is connected with the first compressor clutch 7 and the second compressor clutch 8 through the first motor driving shaft 9 and the second motor driving shaft 10 respectively; the first compressor clutch 7 is connected to the first compressor 3; the second compressor clutch 8 is connected to the second compressor 4.
Preferably, the first compressor 3 comprises a first mechanical variable displacement compressor or a first mechanical fixed displacement compressor;
The second compressor 4 comprises a second mechanical variable displacement compressor or a second mechanical fixed displacement compressor.
Preferably, the operating states of the first and second compressors 3 and 4 are controlled by controlling energization and de-energization of the first and second compressor clutches 7 and 8.
According to the control method of the double-compressor direct drive device for the electric automobile thermal management system, the double-compressor direct drive device for the electric automobile thermal management system is used for executing the following operations:
step S1: controlling the working or non-working state of the compressor by controlling the energization or the de-energization of the clutch of the compressor;
Step S2: judging whether the refrigerating capacity of the compressor meets the heat load requirement of the heat management system or not; when the refrigerating capacity of the compressor is larger or smaller than the heat load demand of the heat management system, the displacement of the compressor is controlled so as to meet the heat load demand of the heat management system.
Preferably, the step S1 employs: by controlling the first compressor clutch 7 and the second compressor clutch 8 to be powered on and off, any one of the compressors is controlled to work independently or both compressors are controlled to work together, and when neither of the compressors needs to work, the motor 1 is controlled to stop.
Preferably, the step S2 employs: and judging whether the refrigerating capacity of the compressor meets the heat load requirement of the heat management system or not through the measured air outlet temperature of the air conditioning box and the outlet temperature of the battery cooler.
Preferably, the step S2 employs:
When only one compressor works, based on a calibrated parameter curve of the environmental temperature, the thermal load of the thermal management system and the rotating speed of the compressor, the initial rotating speed of the motor 1 is controlled by the motor controller 2, and when the refrigerating capacity of the compressor is larger than the thermal load of the thermal management system, the rotating speed of the motor 1 is reduced until a turning point which cannot meet the refrigerating requirement of the thermal management system appears, and then the rotating speed of the motor 1 is increased to keep the motor to operate at the turning point rotating speed; when the refrigerating capacity of the compressor is smaller than the heat load of the thermal management system, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating requirement of the thermal management system appears, and the motor 1 is kept to operate at the inflection point rotating speed;
When the double compressors work simultaneously, the rotating speed requirement of the compressor corresponding to the heat management system with larger heat load is preferentially met, and the motor (1) operates based on the inflection point rotating speed of the compressor; when the other compressor corresponding to the thermal management system with smaller thermal load is a mechanical constant displacement compressor, the on-off of the clutch is controlled to be matched with the refrigeration requirement of the thermal management system; when the other compressor corresponding to the thermal management system with smaller thermal load is a mechanical variable displacement compressor, the displacement of each rotation of the mechanical variable displacement compressor is automatically reduced to maintain the corresponding compressor refrigerating capacity equal to the thermal load of the corresponding thermal management system.
According to the control method of the double-compressor direct drive device for the electric automobile thermal management system, the double-compressor direct drive device for the electric automobile thermal management system is used for executing the following operations:
step M1: calibrating the thermal management system, and determining the rotating speed required by the motor capable of meeting the maximum thermal load of any thermal management system;
step M2: the motor works based on the required rotation speed, and the mechanical variable displacement compressor completely meets the refrigeration requirement of a corresponding thermal management system by automatically adjusting the displacement; and/or the mechanical displacement compressor meets the refrigeration requirement of the thermal management system by controlling the on-off of the clutch.
Preferably, the mechanical variable displacement compressor automatically adjusts each rotation displacement through a built-in control valve, so that the reduced displacement maintains the corresponding compressor refrigerating capacity equal to the thermal load of the thermal management system.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, the motor is matched with the variable displacement compressor, so that the displacement of the compressor can be adjusted by adjusting the rotating speed of the motor, the displacement can be adjusted by a control valve in the compressor, the adjustment range of the displacement of the compressor is increased, different system heat load requirements can be better adapted, and the difficulty of system calibration is reduced; under some low-load working conditions, the compressor is not required to output large refrigerating capacity, but the electric compressor is limited by the minimum rotation speed of 800-1000rpm, and the displacement output can not be reduced any more, so that the energy consumption is increased. For example: there are 2 compressors with a maximum capacity approaching, 1 being 150cc/r of mechanically variable displacement (maximum displacement in 3000rpm, volumetric efficiency 60%) and 1 being 34cc/r of electrically driven compressor (maximum displacement in 8000rpm, volumetric efficiency 90%). The variable displacement compressor can reach the minimum displacement of about 10cc/r through the control valve adjustment, and at the rotating speed of 1000rpm, the minimum displacement can reach 10000cc/min, and the displacement of the electric compressor is 34000cc/min;
2. The external motor scheme adopted by the invention can improve the working environment of the motor and the controller thereof, the insulation design of the motor does not need to consider the influence of refrigerant and lubricating oil, the cooling of the motor also does not need to be influenced by the flow of the refrigerant, and the reliability and the durability of the motor are improved;
3. The mechanical compressor adopted by the invention has complete specification and mature technology; the specification of the electric compressor is less, the technology is not fully mature, and the electric compressor is in a state of being improved and perfected;
4. The control parameter of the invention only has the rotating speed of one motor, and the scheme of the double-motor compressor needs to control the rotating speeds of the two compressors respectively;
5. Compared with the scheme adopting two electric compressors, the invention can reduce the cost of the electric automobile thermal management system on the premise of meeting the same technical performance requirements;
6. According to different performance and cost requirements of the thermal management system, a proper double-compressor combination can be selected to perfectly meet the requirements of users. For example: the heat management system with control precision requirements on the air outlet temperature of the air conditioning box and the cooling outlet temperature of the battery can adopt a double-variable displacement compressor combination; some items which have low requirements on temperature control precision but are more sensitive to cost can be combined by adopting a double fixed displacement compressor and a fixed rotating speed motor, and the combination can be omitted even if a motor controller.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
Fig. 1 is a schematic diagram of a basic structure of a dual compressor system according to the present invention.
FIG. 2 is a schematic diagram showing the control mode of the present invention in the double compressor combined-1 state.
FIG. 3 is a schematic diagram showing the control mode of the present invention in the double compressor combined-2 state.
FIG. 4 is a schematic diagram showing the control mode of the present invention in the double compressor combined-3 state.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Aiming at the defects of the double-motor compressor system in the prior art, the technical problems to be solved by the invention are as follows:
1. The invention adopts the scheme of matching the motor with the variable displacement compressor, solves the defect that the refrigerating capacity of the compressor cannot be completely attached to the heat load of the system under the low-load working condition in the existing electric compressor scheme, and reduces the energy consumption;
2. The external motor scheme adopted by the invention solves the problem that the cooling performance of the motor of the electric compressor is influenced by the flow of the refrigerant, and increases the reliability and durability of the motor;
3. The mechanical compressor adopted by the invention has complete specification and mature technology; solves the problems of less specification and difficult model selection of the electric compressor;
4. the control parameter of the compressor has only the rotating speed of one motor, and compared with the scheme of a double-motor compressor, the invention simplifies the calibration object needed by a control system and reduces the calibration work;
5. the combination of the double compressors provided by the invention increases the selection range of the technical scheme of the thermal management system.
Example 1
The invention provides a double-compressor direct driving device for an electric automobile thermal management system, as shown in fig. 1, comprising: a motor 1, a motor controller 2, a first compressor 3, a second compressor 4, a first compressor clutch 7, a second compressor clutch 8, a first motor drive shaft 9, and a second motor drive shaft 10;
the motor controller 2 is connected with the motor 1; the motor 1 is connected to the first compressor clutch 7 and the second compressor clutch 8 via the first motor drive shaft 9 and the second motor drive shaft 10, respectively; the first compressor clutch 7 is connected to the first compressor 3; the second compressor clutch 8 is connected to the second compressor 4.
Specifically, the first compressor 3 comprises a first mechanical variable displacement compressor or a first mechanical fixed displacement compressor;
The second compressor 4 comprises a first mechanical variable displacement compressor or a first mechanical fixed displacement compressor.
Specifically, the operating or non-operating state of the first and second compressors 3 and 4 is controlled by controlling energization and de-energization of the first and second compressor clutches 7 and 8.
The invention can meet the different technical and cost requirements of various double-compressor thermal management systems through different combinations and control methods of the double-mechanical compressors.
Example 2
Example 2 is a preferred example of example 1
According to the control method of the double-compressor direct drive device for the electric automobile thermal management system, the following operation is performed by using the double-compressor direct drive device for the electric automobile thermal management system:
step S1: controlling the working or non-working state of the mechanical compressor by controlling the energization or the de-energization of the compressor clutch;
Step S2: judging whether the refrigerating capacity of the compressor meets the heat load requirement of the heat management system or not; when the refrigerating capacity of the compressor is larger or smaller than the heat load demand of the heat management system, the displacement of the compressor is controlled so as to meet the heat load demand of the heat management system.
Specifically, the step S1 employs:
By controlling the first compressor clutch 7 and the second compressor clutch 8 to be powered on and off, any one of the mechanical compressors is controlled to work independently or both the mechanical compressors are controlled to work together, and when neither of the mechanical compressors needs to work, the motor 1 is controlled to stop. For example: in the refrigerant systems with 2 compressors independent from each other, the refrigerant system with one compressor is responsible for the air conditioner of the passenger cabin, the refrigerant system with the other compressor is responsible for the battery cooling, and when only one of the air conditioner and the battery cooling is required, only the system with 1 compressor works independently; when 2 demands exist simultaneously, 2 systems where 2 compressors are located are required to operate simultaneously.
Specifically, the step S2 employs: and judging whether the refrigerating capacity of the mechanical compressor meets the heat load requirement of the heat management system or not through the measured air outlet temperature of the air conditioning box and the outlet temperature of the battery cooler.
When the dual compressor is two mechanical variable displacement compressors
As shown in fig. 2, in the dual compressor assembly-1, a first motor drive shaft 9 of the motor 1 is connected to a first mechanical variable displacement compressor through a first compressor clutch 7; a second motor drive shaft 10 of the motor 1 is connected to a second mechanical variable displacement compressor via a second compressor clutch 8. By controlling the energization and the de-energization of the first compressor clutch 7 and the second compressor clutch 8, either one of the compressors can be operated alone or both of the compressors can be operated together. When neither compressor needs to work, the motor 1 is stopped.
When only one compressor works, the initial rotating speed of the motor 1 is controlled by the motor controller 2 according to a parameter curve of environmental temperature, system heat load and compressor rotating speed, if the refrigerating capacity of the compressor is larger than the system heat load, the rotating speed of the motor 1 is reduced until an inflection point which cannot meet the refrigerating demand of the system appears, and then the rotating speed of the motor 1 is increased to keep the operation at the inflection point rotating speed. If the refrigerating capacity of the compressor is smaller than the system heat load, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating demand of the system appears, and then the motor 1 is kept to operate at the inflection point rotating speed.
When two compressors need to work simultaneously, referring to the parameter curve of environmental temperature, system heat load and compressor rotation speed calibrated in advance, according to the requirement of a system with larger heat load, the initial rotation speed of the motor 1 is controlled by the motor controller 2, if the refrigerating capacity of the compressor corresponding to the system with larger heat load is larger than the heat load of the system, the rotation speed of the motor 1 is reduced until an inflection point which cannot meet the refrigerating requirement of the system appears, and then the rotation speed of the motor 1 is increased to keep the operation at the inflection point rotation speed. If the refrigerating capacity of the compressor is smaller than the system heat load, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating demand of the system appears, and then the motor 1 is kept to operate at the inflection point rotating speed. At this time, the other compressor corresponding to the system with smaller heat load can automatically adjust the displacement, so that the compressor completely meets the refrigeration requirement of the system.
There is also a control method that reduces cost and control difficulty, but increases energy consumption. Through earlier stage system calibration, confirm the required rotational speed of motor that can satisfy arbitrary system maximum thermal load, then, select the rotational speed motor of choosing, make the motor work at this rotational speed all the time. The two compressors are self-regulating in displacement to fit the corresponding refrigerating requirement.
When the dual compressor is 1 mechanical variable displacement compressor and 1 mechanical fixed displacement compressor.
As shown in fig. 3, in the dual compressor assembly-2, a first motor drive shaft 9 of the motor 1 is connected to a first mechanical variable displacement compressor through a first compressor clutch 7; a second motor drive shaft 10 of the motor 1 is connected to a second mechanical fixed displacement compressor via a second compressor clutch 8. By controlling the energization and the de-energization of the first compressor clutch 7 and the second compressor clutch 8, either one of the compressors can be operated alone or both of the compressors can be operated together. When neither compressor needs to work, the motor 1 is stopped.
When only one variable displacement compressor works, the initial rotation speed of the motor 1 is controlled by the motor controller 2 according to a parameter curve of environmental temperature, system heat load and compressor rotation speed, if the refrigerating capacity of the compressor is larger than the system heat load, the rotation speed of the motor 1 is reduced until an inflection point which cannot meet the refrigerating requirement of the system appears, and then the rotation speed of the motor 1 is increased to keep the operation at the inflection point rotation speed. If the refrigerating capacity of the compressor is smaller than the system heat load, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating demand of the system appears, and then the motor 1 is kept to operate at the inflection point rotating speed.
When only one fixed displacement compressor works, the initial rotation speed of the motor 1 is controlled by the motor controller 2 according to the parameter curve of the environmental temperature, the system heat load and the rotation speed of the compressor, if the refrigerating capacity of the compressor is not less than the system heat load, the rotation speed of the motor 1 is reduced until the inflection point which cannot meet the refrigerating requirement of the system appears, and then the rotation speed of the motor 1 is increased to keep the operation at the inflection point rotation speed. If the refrigerating capacity of the compressor is smaller than the system heat load, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating demand of the system appears, and then the motor 1 is kept to operate at the inflection point rotating speed.
When two compressors need to work simultaneously, referring to the parameter curve of environmental temperature, system heat load and compressor rotation speed calibrated in advance, according to the requirement of a system with larger heat load, the initial rotation speed of the motor 1 is controlled through the motor controller 2, if the refrigerating capacity of the compressor corresponding to the system with larger heat load is larger than the system heat load, the rotation speed of the motor 1 is reduced until an inflection point which cannot meet the refrigerating requirement of the system appears, and then the rotation speed of the motor 1 is increased, so that the motor is kept to run at the inflection point rotation speed. If the refrigerating capacity of the compressor is smaller than the system heat load, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating demand of the system appears, and then the motor 1 is kept to operate at the inflection point rotating speed. At the moment, if the other compressor corresponding to the system with smaller heat load is of variable displacement, the displacement can be automatically regulated, so that the compressor completely meets the refrigeration requirement of the system; if the displacement is fixed, the refrigeration requirement of the system can be met by controlling the on-off of the clutch.
There is also a control method that reduces cost and control difficulty, but increases energy consumption. Through earlier stage system calibration, confirm the required rotational speed of motor that can satisfy arbitrary system maximum thermal load, then, select the rotational speed motor of choosing, make the motor work at this rotational speed all the time. The variable displacement compressor automatically adjusts the displacement to completely fit the corresponding system refrigeration requirement; the fixed displacement compressor meets the refrigeration requirement of the system by controlling the on-off of the clutch.
When the dual compressor is two mechanical fixed displacement compressors
As shown in fig. 4, in the dual compressor assembly-3, a first motor drive shaft 9 of the motor 1 is connected to a first mechanical fixed displacement compressor through a first compressor clutch 7; a second motor drive shaft 10 of the motor 1 is connected to a second mechanical fixed displacement compressor via a second compressor clutch 8. By controlling the energization and the de-energization of the first compressor clutch 7 and the second compressor clutch 8, either one of the compressors can be operated alone or both of the compressors can be operated together. When neither compressor needs to work, the motor 1 is stopped.
When only one fixed displacement compressor works, the initial rotation speed of the motor 1 is controlled by the motor controller 2 according to a parameter curve of environmental temperature, system heat load and compressor rotation speed, if the refrigerating capacity of the compressor is larger than the system heat load, the rotation speed of the motor 1 is reduced until an inflection point which cannot meet the refrigerating requirement of the system appears, and then the rotation speed of the motor 1 is increased to keep the operation at the inflection point rotation speed. If the refrigerating capacity of the compressor is smaller than the system heat load, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating demand of the system appears, and then the motor 1 is kept to operate at the inflection point rotating speed.
When two fixed displacement compressors need to work simultaneously, referring to the parameter curve of environmental temperature, system heat load and compressor rotation speed calibrated in advance, according to the requirement of a system with larger heat load, controlling the initial rotation speed of the motor 1 through the motor controller 2, if the refrigerating capacity of the compressor corresponding to the system with larger heat load is larger than the system heat load, reducing the rotation speed of the motor 1 until an inflection point which cannot meet the refrigerating requirement of the system appears, and then increasing the rotation speed of the motor 1 to keep the operation at the inflection point rotation speed. If the refrigerating capacity of the compressor is smaller than the system heat load, the rotating speed of the motor 1 is increased until an inflection point capable of meeting the refrigerating demand of the system appears, and then the motor 1 is kept to operate at the inflection point rotating speed. At this time, the other compressor corresponding to the system with smaller heat load can be attached to the refrigeration requirement of the system by controlling the on-off of the clutch.
There is also a control method that reduces cost and control difficulty, but increases energy consumption. Through earlier stage system calibration, confirm the required rotational speed of motor that can satisfy arbitrary system maximum thermal load, then, select the rotational speed motor of choosing, make the motor work at this rotational speed all the time. The two fixed displacement compressors meet the refrigeration requirement of the system by controlling the on-off of the clutch.
Specifically, the early system calibration includes: under the environment of various temperatures, humidity and vehicle speed, the heat load of the refrigerant system to be balanced is different, so that tests under the combined working conditions of various vehicle speeds, various temperatures and humidity, including common working conditions and limit working conditions, are required to be carried out in a wind tunnel laboratory capable of controlling the environment temperature, humidity, vehicle speed and vehicle head-on wind speed, and the test is a system calibration test. When a calibration test is performed, the calibration rotating speed of the compressor under each working condition in the combined working conditions can be found, and the refrigerating capacity of the compressor can just balance the heat load of the system under the rotating speed. When the calibration test of the thermal management system is carried out, the working condition of the maximum refrigerating capacity exists, and under the working condition, the calibration confirms the rotating speed of the compressor which can meet the maximum refrigerating capacity. Ensure that motor rotational speed can satisfy the discharge capacity that the compressor required when the maximum refrigerating capacity, at this motor rotational speed, the mode of compressor adjustment discharge capacity is: the variable displacement compressor controls the displacement of the compressor through the regulating valve and outputs the refrigerating capacity required by the heat load balance of the system; the constant displacement compressor is powered on through the clutch, so that the refrigerating capacity of the compressor exceeds the demand of the heat load of the system, the temperature and the pressure of the system reach a set shutdown value by the exceeding refrigerating capacity, the clutch is controlled to be powered off, the compressor does not work, at the moment, the temperature and the pressure parameters continuously change due to the lack of balance of the refrigerating capacity of the compressor, and the parameters reach a set startup value by the temperature and the pressure parameters, so that the clutch is controlled to be powered on and the compressor works. The temperature and the pressure of the system are kept in a set range by controlling the start and stop of the compressor, so that the requirements of passenger cabin air conditioning and battery cooling are met.
In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Those skilled in the art will appreciate that the systems, apparatus, and their respective modules provided herein may be implemented entirely by logic programming of method steps such that the systems, apparatus, and their respective modules are implemented as logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc., in addition to the systems, apparatus, and their respective modules being implemented as pure computer readable program code. Therefore, the system, the apparatus, and the respective modules thereof provided by the present invention may be regarded as one hardware component, and the modules included therein for implementing various programs may also be regarded as structures within the hardware component; modules for implementing various functions may also be regarded as being either software programs for implementing the methods or structures within hardware components.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (6)
1. A control method of a dual-compressor direct drive device for an electric automobile thermal management system, characterized in that the following operations are performed by using the dual-compressor direct drive device for the electric automobile thermal management system:
step S1: controlling the working or non-working state of the compressor by controlling the energization or the de-energization of the clutch of the compressor;
Step S2: judging whether the refrigerating capacity of the compressor meets the heat load requirement of the heat management system or not; when the refrigerating capacity of the compressor is larger or smaller than the heat load demand of the heat management system, controlling the displacement of the compressor so as to meet the heat load demand of the heat management system;
The dual compressor direct drive for an electric vehicle thermal management system includes: a motor (1), a motor controller (2), a first compressor (3), a second compressor (4), a first compressor clutch (7), a second compressor clutch (8), a first motor drive shaft (9) and a second motor drive shaft (10);
The motor controller (2) is connected with the motor (1); the motor (1) is connected with the first compressor clutch (7) and the second compressor clutch (8) through the first motor driving shaft (9) and the second motor driving shaft (10) respectively; the first compressor clutch (7) is connected to the first compressor (3); the second compressor clutch (8) is connected to the second compressor (4);
the step S2 adopts:
When only one compressor works, based on a calibrated environment temperature-thermal management system heat load-compressor rotating speed parameter curve, controlling the initial rotating speed of the motor (1) through the motor controller (2), and when the refrigerating capacity of the compressor is larger than the thermal management system heat load, reducing the rotating speed of the motor (1) until a turning point which cannot meet the refrigerating requirement of the thermal management system appears, and then increasing the rotating speed of the motor (1) to keep the motor to operate at the turning point rotating speed; when the refrigerating capacity of the compressor is smaller than the heat load of the thermal management system, the rotating speed of the motor (1) is increased until an inflection point capable of meeting the refrigerating requirement of the thermal management system appears, and the motor (1) is kept to operate at the inflection point rotating speed;
When the double compressors work simultaneously, the rotating speed requirement of the compressor corresponding to the heat management system with larger heat load is preferentially met, and the motor (1) operates based on the inflection point rotating speed of the compressor; when the other compressor corresponding to the thermal management system with smaller thermal load is a mechanical constant displacement compressor, the on-off of the clutch is controlled to be matched with the refrigeration requirement of the thermal management system; when the other compressor corresponding to the thermal management system with smaller thermal load is a mechanical variable displacement compressor, the displacement of each rotation of the mechanical variable displacement compressor is automatically reduced to maintain the corresponding compressor refrigerating capacity equal to the thermal load of the corresponding thermal management system.
2. Control method of a dual compressor direct drive for an electric vehicle thermal management system according to claim 1, characterized in that the first compressor (3) comprises a first mechanical variable displacement compressor or a first mechanical fixed displacement compressor;
The second compressor (4) comprises a second mechanical variable displacement compressor or a second mechanical fixed displacement compressor.
3. Control method for a dual compressor direct drive for an electric vehicle thermal management system according to claim 1, characterized in that the operating state of the first (3) and second (4) compressors is controlled by controlling the energizing and de-energizing of the first (7) and second (8) compressor clutches.
4. The control method of a dual compressor direct drive apparatus for an electric vehicle thermal management system according to claim 1, wherein said step S1 employs: and by controlling the first compressor clutch (7) and the second compressor clutch (8) to be electrified and powered off, any one of the compressors is controlled to work independently or the two compressors are controlled to work together, and when the two compressors do not need to work, the motor (1) is controlled to stop.
5. The control method of a dual compressor direct drive apparatus for an electric vehicle thermal management system according to claim 1, wherein said step S2 employs: and judging whether the refrigerating capacity of the compressor meets the heat load requirement of the heat management system or not through the measured air outlet temperature of the air conditioning box and the outlet temperature of the battery cooler.
6. A control method of a dual-compressor direct drive device for an electric automobile thermal management system, characterized in that the following operations are performed by using the dual-compressor direct drive device for the electric automobile thermal management system:
step M1: calibrating the thermal management system, and determining the rotating speed required by the motor capable of meeting the maximum thermal load of any thermal management system;
Step M2: the motor works based on the required rotation speed, and the mechanical variable displacement compressor completely meets the refrigeration requirement of a corresponding thermal management system by automatically adjusting the displacement; and/or the mechanical fixed displacement compressor meets the refrigeration requirement of the thermal management system by controlling the on-off of the clutch;
The dual compressor direct drive for an electric vehicle thermal management system includes: a motor (1), a motor controller (2), a first compressor (3), a second compressor (4), a first compressor clutch (7), a second compressor clutch (8), a first motor drive shaft (9) and a second motor drive shaft (10);
The motor controller (2) is connected with the motor (1); the motor (1) is connected with the first compressor clutch (7) and the second compressor clutch (8) through the first motor driving shaft (9) and the second motor driving shaft (10) respectively; the first compressor clutch (7) is connected to the first compressor (3); the second compressor clutch (8) is connected to the second compressor (4);
the step M2 adopts:
When only one compressor works, based on a calibrated environment temperature-thermal management system heat load-compressor rotating speed parameter curve, controlling the initial rotating speed of the motor (1) through the motor controller (2), and when the refrigerating capacity of the compressor is larger than the thermal management system heat load, reducing the rotating speed of the motor (1) until a turning point which cannot meet the refrigerating requirement of the thermal management system appears, and then increasing the rotating speed of the motor (1) to keep the motor to operate at the turning point rotating speed; when the refrigerating capacity of the compressor is smaller than the heat load of the thermal management system, the rotating speed of the motor (1) is increased until an inflection point capable of meeting the refrigerating requirement of the thermal management system appears, and the motor (1) is kept to operate at the inflection point rotating speed;
When the double compressors work simultaneously, the rotating speed requirement of the compressor corresponding to the heat management system with larger heat load is preferentially met, and the motor (1) operates based on the inflection point rotating speed of the compressor; when the other compressor corresponding to the thermal management system with smaller thermal load is a mechanical constant displacement compressor, the on-off of the clutch is controlled to be matched with the refrigeration requirement of the thermal management system; when the other compressor corresponding to the thermal management system with smaller thermal load is a mechanical variable displacement compressor, the displacement of each rotation of the mechanical variable displacement compressor is automatically reduced to maintain the corresponding compressor refrigerating capacity equal to the thermal load of the corresponding thermal management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210994584.3A CN115384275B (en) | 2022-08-18 | 2022-08-18 | Dual-compressor direct driving device for electric automobile thermal management system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210994584.3A CN115384275B (en) | 2022-08-18 | 2022-08-18 | Dual-compressor direct driving device for electric automobile thermal management system and control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115384275A CN115384275A (en) | 2022-11-25 |
| CN115384275B true CN115384275B (en) | 2024-06-25 |
Family
ID=84119812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210994584.3A Active CN115384275B (en) | 2022-08-18 | 2022-08-18 | Dual-compressor direct driving device for electric automobile thermal management system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115384275B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386872A (en) * | 2013-07-04 | 2013-11-13 | 郑州宇通客车股份有限公司 | Hybrid power bus, double-compressor air-conditioning system and refrigeration control method of double-compressor air-conditioning system |
| CN114771198A (en) * | 2022-04-14 | 2022-07-22 | 浙江吉利控股集团有限公司 | Vehicle with a steering wheel |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3818136B2 (en) * | 2001-11-27 | 2006-09-06 | 株式会社豊田自動織機 | Air conditioner |
| US6761037B2 (en) * | 2002-01-23 | 2004-07-13 | Sanden Corporation | Vehicle air conditioner using a hybrid compressor |
| US8484985B2 (en) * | 2009-03-31 | 2013-07-16 | Delphi Technologies, Inc. | Air conditioner system having an externally controlled variable displacement compressor and a clutch and method of operating the same |
| CN203358290U (en) * | 2013-07-04 | 2013-12-25 | 郑州宇通客车股份有限公司 | Hybrid power bus and double-compressor air conditioning system |
| CN210971263U (en) * | 2019-10-11 | 2020-07-10 | 陕西重型汽车有限公司 | Integrated system composed of automobile steering oil pump, air compressor and air conditioner compressor |
-
2022
- 2022-08-18 CN CN202210994584.3A patent/CN115384275B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386872A (en) * | 2013-07-04 | 2013-11-13 | 郑州宇通客车股份有限公司 | Hybrid power bus, double-compressor air-conditioning system and refrigeration control method of double-compressor air-conditioning system |
| CN114771198A (en) * | 2022-04-14 | 2022-07-22 | 浙江吉利控股集团有限公司 | Vehicle with a steering wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115384275A (en) | 2022-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US12049120B2 (en) | Parking cooler | |
| CN102320278B (en) | Self-adaptive control method of air-conditioning system of electric vehicle | |
| US6745585B2 (en) | Electric air conditioner sustain system | |
| US8453722B2 (en) | Vehicle air conditioning and heating system providing engine on and engine off operation | |
| US7966839B2 (en) | Method and system for controlling a compressor for an HVAC module | |
| US7007856B2 (en) | Extended engine off passenger climate control system and method | |
| CN101537790B (en) | Controlling temperature of vehicle devices using a variable speed fan | |
| CN103587375A (en) | Climate control system and method for optimizing energy consumption of vehicle | |
| US20150191073A1 (en) | Method and vehicle for operating a vehicle air conditioning system | |
| US20070000265A1 (en) | Method and system for cooling a work machine compartment | |
| CN101590797A (en) | Be used to improve the HVAC system control of vehicle fuel economy | |
| CN209795105U (en) | Double-drive air conditioning system for automobile | |
| CN115384275B (en) | Dual-compressor direct driving device for electric automobile thermal management system and control method | |
| CN115817109A (en) | Control system and method of thermal management system of trans-critical carbon dioxide new energy vehicle | |
| CN113898603B (en) | Whole vehicle fan control system and method | |
| CN115320335A (en) | Double-compressor indirect driving device for electric automobile thermal management system and control method | |
| CN103743062A (en) | Vehicle air-conditioning control method and air-conditioning compressor assembly | |
| WO2019035791A2 (en) | Economical air conditioning system on the motor vehicles | |
| CN215705537U (en) | Heat pump system | |
| CN208021142U (en) | A kind of air conditioning system for vehicle | |
| CN103738141A (en) | Control method of vehicle air-conditioning system | |
| KR20240102391A (en) | Control Unit for refrigeration and freezing keeping system using parallel compressor when parking | |
| CN104807149B (en) | Air conditioning system for vehicle and its control method | |
| CN116278625A (en) | Thermal management system and car | |
| CN117565636A (en) | Special vehicle refrigerating device and method, electronic equipment and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |