CN108674123B - Control method and control system of vehicle air conditioner and vehicle - Google Patents
Control method and control system of vehicle air conditioner and vehicle Download PDFInfo
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- CN108674123B CN108674123B CN201810350255.9A CN201810350255A CN108674123B CN 108674123 B CN108674123 B CN 108674123B CN 201810350255 A CN201810350255 A CN 201810350255A CN 108674123 B CN108674123 B CN 108674123B
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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
- B60H1/00821—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being ventilating, air admitting or air distributing devices
- B60H1/00828—Ventilators, e.g. speed control
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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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- Air-Conditioning For Vehicles (AREA)
Abstract
The invention provides a control method and a control system of a vehicle air conditioner and a vehicle, and belongs to the field of vehicles. The method comprises the following steps: collecting a pressure value of the refrigerant; comparing the pressure value at the current moment with the pressure value at the previous moment; when the pressure value is increased, comparing the pressure value at the current moment with the first high-pressure protection value and the first low-pressure protection value, if the pressure value is higher than the first low-pressure protection value and lower than the first high-pressure protection value, outputting a corresponding rotating speed by a fan of the air conditioner according to the current pressure value, and otherwise, cutting off the compressor; and when the pressure value is reduced, comparing the pressure value at the current moment with the second high-pressure protection value and the second low-pressure protection value, if the pressure value is higher than the second low-pressure protection value and lower than the second high-pressure protection value, outputting a corresponding rotating speed by the fan according to the current pressure value, and otherwise, cutting off the compressor. The invention further provides a corresponding control system and a vehicle with the same. The control method, the control system and the vehicle can effectively reduce the condition of refrigerant leakage.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a control method and a control system of a vehicle air conditioner and a vehicle.
Background
When abnormal conditions such as blocked radiating fins, non-rotation of a cooling fan or excessive refrigerant and the like occur in the use process of the vehicle air conditioner, the system elements are easily damaged due to overhigh pressure of a refrigeration system. When the refrigerant of the refrigerating system is insufficient or leaks, the refrigerating lubricating oil can also leak along with the refrigerant, so that the lubrication of the air conditioning system is poor, and if the compressor runs in an oil shortage state, the compressor is seriously damaged.
In order to protect the components of the refrigeration system, a pressure switch protection circuit is usually disposed in a refrigeration cycle pipeline of the air conditioner, the working state of the air conditioner is controlled by closing or opening a pressure switch, and an air conditioner compressor is cut off to protect the system components when the pressure switch is over-pressurized.
However, because the refrigeration system has high-voltage protection and low-voltage protection, some air conditioners can also be provided with medium-voltage protection, namely, a fan of the air conditioner is turned on, and at the moment, a high-voltage switch, a medium-voltage switch and a low-voltage switch are required to be arranged.
Disclosure of Invention
An object of the present invention is to provide a control method of a vehicle air conditioner capable of effectively reducing a situation of refrigerant leakage.
Another object of the present invention is to improve the intelligence of the control method of the vehicle air conditioner.
Particularly, the present invention provides a control method of a vehicle air conditioner, comprising the steps of:
collecting a pressure value of a refrigerant of the air conditioner;
comparing the pressure value at the current moment with the pressure value at the previous moment;
when the pressure value at the current moment is larger than the pressure value at the previous moment, respectively comparing the pressure value at the current moment with the first high-pressure protection value and the first low-pressure protection value,
if the pressure value at the current moment is higher than the first low-pressure protection value and lower than the first high-pressure protection value, the air conditioner works normally and a fan of the air conditioner outputs a corresponding rotating speed according to the current pressure value, otherwise, a compressor of the air conditioner is cut off;
when the pressure value at the current moment is smaller than the pressure value at the previous moment, respectively comparing the pressure value at the current moment with the second high-pressure protection value and the second low-pressure protection value,
and if the pressure value at the current moment is higher than the second low-pressure protection value and lower than the second high-pressure protection value, the air conditioner works normally and the fan outputs a corresponding rotating speed according to the current pressure value, otherwise, a compressor of the air conditioner is cut off.
Optionally, the method further comprises:
and when the pressure value at the current moment is greater than the first low-pressure protection value, the compressor of the air conditioner recovers to operate.
Optionally, the method further comprises:
and when the pressure value at the current moment is smaller than the second high-pressure protection value, the compressor of the air conditioner resumes operation.
Optionally, the rotation speed output by the fan is calibrated in advance according to the pressure value measured by the pressure sensor.
Optionally, the first low-voltage protection value is 0.206MPa, the first high-voltage protection value is 3.14MPa, the second low-voltage protection value is 0.196MPa, and the second high-voltage protection value is 2.55 MPa.
Particularly, the present invention also provides a control system of a vehicle air conditioner, comprising:
the pressure sensor is used for acquiring the pressure value of the refrigerant of the air conditioner;
the comparator is used for comparing the pressure value at the current moment with the pressure value at the previous moment, and is configured to respectively compare the pressure value at the current moment with the first high-pressure protection value and the first low-pressure protection value when the pressure value at the current moment is greater than the pressure value at the previous moment, and respectively compare the pressure value at the current moment with the second high-pressure protection value and the second low-pressure protection value when the pressure value at the current moment is less than the pressure value at the previous moment; and
the controller is configured to control the air conditioner to normally work and control a fan of the air conditioner to output a corresponding rotating speed according to a current pressure value when the pressure value at the current moment is higher than a first low-pressure protection value and lower than a first high-pressure protection value, otherwise, the controller controls to cut off a compressor of the air conditioner;
the controller is also configured to control the air conditioner to normally work and control the fan to output a corresponding rotating speed according to the current pressure value when the pressure value at the current moment is higher than a second low-pressure protection value and lower than a second high-pressure protection value, otherwise, the controller controls the compressor of the air conditioner to be switched off.
Optionally, the controller is further configured to control the compressor of the air conditioner to resume operation when the pressure value at the current moment is greater than the first low-pressure protection value.
Optionally, the controller is further configured to control the compressor of the air conditioner to resume operation when the pressure value at the current moment is smaller than the second high-pressure protection value.
Optionally, the rotation speed output by the fan is calibrated in advance according to the pressure value measured by the pressure sensor.
In particular, the invention also provides a vehicle comprising the control system of any one of the above items.
According to the control method of the vehicle air conditioner, a pressure sensor is adopted to replace a traditional pressure switch, the pressure sensor can be installed in a refrigeration cycle pipeline of the air conditioner, the working state of the air conditioner is controlled according to the pressure value of a refrigerant measured by the pressure sensor, the pressure sensor collects the pressure value of the refrigerant of the air conditioner in real time, and the pressure value is respectively compared with a corresponding low-pressure protection value and a corresponding high-pressure protection value according to the rise or fall of the pressure value along with the time, so that the high-pressure protection and the low-pressure protection of the air conditioner are realized, namely, a compressor of the air conditioner is cut off, the pressure switch is not used any more, and.
Furthermore, the rotating speed of the fan in the embodiment can be correspondingly output according to the pressure value, so that the rotating speed output by the fan can better meet the actual requirement of the air conditioner, and the improvement of the intelligent control of the air conditioner is facilitated.
Further, the first low-voltage protection value, the first high-voltage protection value, the second low-voltage protection value, the second high-voltage protection value, the second low-voltage protection value and the second high-voltage protection value are determined in advance according to performance test data of the pressure sensor. That is to say, the specific value of the pressure protection value can be obtained according to the test data of the pressure sensor, and the setting of the protection value is more consistent with the characteristics of the pressure sensor through the actual test value, so that the control method of the invention is more accurate.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a flowchart of a control method of a vehicle air conditioner according to an embodiment of the present invention;
fig. 2 is a logic block diagram of a control method of a vehicle air conditioner according to another embodiment of the present invention;
fig. 3 is a system block diagram of a control system of a vehicle air conditioner according to one embodiment of the present invention.
Detailed Description
Fig. 1 is a flowchart of a control method of a vehicle air conditioner according to one embodiment of the present invention. As shown in fig. 1, the control method may generally include the steps of:
s10: the pressure value of the refrigerant of the air conditioner is collected.
S20: and judging whether the pressure value at the current moment is larger than the pressure value at the previous moment, if so, entering S30, and otherwise, entering S40.
S30: and respectively comparing the pressure value at the current moment with the first high-pressure protection value and the first low-pressure protection value, if the pressure value at the current moment is higher than the first low-pressure protection value and lower than the first high-pressure protection value, the air conditioner normally works and the fan of the air conditioner outputs a corresponding rotating speed according to the current pressure value, and otherwise, the compressor of the air conditioner is cut off.
S40: and respectively comparing the pressure value at the current moment with the second high-pressure protection value and the second low-pressure protection value, if the pressure value at the current moment is higher than the second low-pressure protection value and lower than the second high-pressure protection value, the air conditioner normally works and the fan outputs a corresponding rotating speed according to the current pressure value, and otherwise, the compressor of the air conditioner is cut off.
According to the control method of the vehicle air conditioner, a pressure sensor is adopted to replace a traditional pressure switch, the pressure sensor can be installed in a refrigeration cycle pipeline of the air conditioner, the working state of the air conditioner is controlled according to the pressure value of the refrigerant measured by the pressure sensor, the pressure sensor collects the pressure value of the refrigerant of the air conditioner in real time, and the pressure value is respectively compared with a corresponding low-pressure protection value and a corresponding high-pressure protection value according to the rise or fall of the pressure value along with the time, so that the high-pressure protection and the low-pressure protection of the air conditioner are realized, namely, a compressor of the air conditioner is cut off, the pressure switch is not used any more, the possibility of refrigerant leakage.
Furthermore, the rotating speed of the fan in the embodiment can be correspondingly output according to the pressure value, so that the rotating speed output by the fan can better meet the actual requirement of the air conditioner, and the improvement of the intelligent control of the air conditioner is facilitated.
Fig. 2 is a logic block diagram of a control method of a vehicle air conditioner according to another embodiment of the present invention. As shown in fig. 2, in another embodiment of the present invention, when the pressure value at the current time is greater than the pressure value at the previous time, the method includes the following steps:
s31: and judging whether the pressure value at the current moment is higher than the first low-pressure protection value, if so, entering S32, and otherwise, entering S34.
S32: the compressor of the air conditioner resumes operation.
S33: and judging whether the pressure value at the current moment is higher than the first high-pressure protection value, if so, entering S34, and otherwise, entering S35.
S34: the compressor of the air conditioner is switched off.
S35: the air conditioner works normally and the fan outputs corresponding rotating speed according to the current pressure value.
As shown in fig. 2, in one embodiment, when the pressure value at the current time is smaller than the pressure value at the previous time, the method includes the following steps:
s41: and judging whether the pressure value at the current moment is lower than the second high-pressure protection value, if so, entering S42, and otherwise, entering S44.
S42: the compressor of the air conditioner resumes operation.
S43: and judging whether the pressure value at the current moment is lower than the second low-pressure protection value, if so, entering S44, and otherwise, entering S45.
S44: the compressor of the air conditioner is switched off.
S45: the air conditioner works normally and the fan outputs corresponding rotating speed according to the current pressure value.
In one embodiment, the first low voltage protection value may be set to 0.206MPa, the first high voltage protection value may be set to 3.14MPa, the second low voltage protection value may be set to 0.196MPa, and the second high voltage protection value may be set to 2.55 MPa. In other embodiments, the above numerical value may be other values, and is not limited herein. The first and second low-pressure protection values may not be the same, as may the first and second high-pressure protection values, due to the physical characteristics of the pressure sensor itself. The principle of the pressure sensor is that the serial number of an electric signal is triggered through pressure change, pressure values expressed by the same electric signal can be different under the conditions of pressure increase and pressure reduction, and specific numerical values of protection values need to be finely adjusted under the conditions so as to meet the characteristics of the pressure sensor.
In the above embodiment, the rotation speed output by the fan may be calibrated in advance according to the pressure value measured by the pressure sensor. For example, in a certain range of values, as the pressure value measured by the pressure sensor increases, the rotation speed of the fan output of the air conditioner also increases. Specifically, the fan outputs the rotation speed at an output power of 30% when the measured pressure value is greater than 0.206Mpa and less than 1.0Mpa during the pressure-up process, and outputs the rotation speed at an output power of 60% when the measured pressure value is greater than 0.7Mpa and less than 0.9Mpa during the pressure-down process. This is actually to establish an adaptive system of fan rotation speed based on refrigerant pressure, and embodies the intelligent control of the air conditioning system.
The invention also provides a control system of the vehicle air conditioner, which comprises the pressure sensor, the comparator and the controller. The pressure sensor is used for collecting the pressure value of the refrigerant of the air conditioner. The comparator is used for comparing the pressure value at the current moment with the pressure value at the previous moment, and is configured to respectively compare the pressure value at the current moment with the first high-pressure protection value and the first low-pressure protection value when the pressure value at the current moment is greater than the pressure value at the previous moment, and respectively compare the pressure value at the current moment with the second high-pressure protection value and the second low-pressure protection value when the pressure value at the current moment is less than the pressure value at the previous moment. The controller is configured to control the air conditioner to normally work and control a fan of the air conditioner to output a corresponding rotating speed according to a current pressure value when the pressure value at the current moment is higher than a first low-pressure protection value and lower than a first high-pressure protection value, otherwise, the controller controls to cut off a compressor of the air conditioner. The controller is also configured to control the air conditioner to normally work and control the fan to output a corresponding rotating speed according to the current pressure value when the pressure value at the current moment is higher than a second low-pressure protection value and lower than a second high-pressure protection value, otherwise, the controller controls the compressor of the air conditioner to be switched off.
The control system of the vehicle air conditioner adopts the pressure sensor to replace a traditional pressure switch, the pressure sensor can be installed in a refrigeration cycle pipeline of the air conditioner, the working state of the air conditioner is controlled according to the pressure value of the refrigerant measured by the pressure sensor, the pressure sensor collects the pressure value of the refrigerant of the air conditioner in real time, and the pressure value is respectively compared with a corresponding low-pressure protection value and a corresponding high-pressure protection value according to the rise or fall of the pressure value along with the time, so that the high-pressure protection and the low-pressure protection of the air conditioner are realized, namely, a compressor of the air conditioner is cut off, the pressure switch is not used any more, the possibility of refrigerant leakage is reduced, and.
Furthermore, the rotating speed of the fan in the embodiment can be correspondingly output according to the pressure value, so that the rotating speed output by the fan can better meet the actual requirement of the air conditioner, and the improvement of the intelligent control of the air conditioner is facilitated.
In one embodiment, the controller is further configured to control the compressor of the air conditioner to resume operation when the pressure value at the current time is greater than the first low-pressure protection value.
In another embodiment, the controller is further configured to control the compressor of the air conditioner to resume operation when the pressure value at the current time is less than the second high-pressure protection value.
Optionally, the rotation speed output by the fan is calibrated in advance according to the pressure value measured by the pressure sensor.
The invention also provides a vehicle comprising any one of the control systems. The control system of the vehicle adopts the pressure sensor to replace a traditional pressure switch, controls the working state of the air conditioner according to the pressure value of the refrigerant measured by the pressure sensor, acquires the pressure value of the refrigerant of the air conditioner in real time by the pressure sensor, and compares the pressure value with the corresponding low-pressure protection value and the high-pressure protection value according to the rise or the fall of the pressure value along with the time, so that the high-pressure protection and the low-pressure protection of the air conditioner are realized, namely, a compressor of the air conditioner is cut off, the pressure switch is not used any more, the possibility of refrigerant leakage is reduced, and the structure is more compact.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (6)
1. A control method of a vehicle air conditioner, characterized by comprising the steps of:
collecting a pressure value of a refrigerant of the air conditioner;
comparing the pressure value at the current moment with the pressure value at the previous moment;
when the pressure value at the current moment is larger than the pressure value at the previous moment, respectively comparing the pressure value at the current moment with the first high-pressure protection value and the first low-pressure protection value,
if the pressure value at the current moment is higher than the first low-pressure protection value and lower than the first high-pressure protection value, the air conditioner works normally and a fan of the air conditioner outputs a corresponding rotating speed according to the current pressure value, otherwise, a compressor of the air conditioner is cut off;
when the pressure value at the current moment is smaller than the pressure value at the previous moment, respectively comparing the pressure value at the current moment with the second high-pressure protection value and the second low-pressure protection value,
and if the pressure value at the current moment is higher than the second low-pressure protection value and lower than the second high-pressure protection value, the air conditioner works normally and the fan outputs a corresponding rotating speed according to the current pressure value, otherwise, a compressor of the air conditioner is cut off.
2. The control method according to claim 1,
the rotating speed output by the fan is calibrated in advance according to the pressure value measured by the pressure sensor.
3. The control method according to claim 1 or 2,
the first high voltage protection value is 3.14MPa, and the second low voltage protection value is 0.196 MPa.
4. A control system of an air conditioner for a vehicle, characterized by comprising:
the pressure sensor is used for acquiring the pressure value of the refrigerant of the air conditioner;
the comparator is used for comparing the pressure value at the current moment with the pressure value at the previous moment, and is configured to respectively compare the pressure value at the current moment with the first high-pressure protection value and the first low-pressure protection value when the pressure value at the current moment is greater than the pressure value at the previous moment, and respectively compare the pressure value at the current moment with the second high-pressure protection value and the second low-pressure protection value when the pressure value at the current moment is less than the pressure value at the previous moment; and
the controller is configured to control the air conditioner to normally work and control a fan of the air conditioner to output a corresponding rotating speed according to a current pressure value when the pressure value at the current moment is higher than a first low-pressure protection value and lower than a first high-pressure protection value, otherwise, the controller controls to cut off a compressor of the air conditioner;
the controller is also configured to control the air conditioner to normally work and control the fan to output a corresponding rotating speed according to the current pressure value when the pressure value at the current moment is higher than a second low-pressure protection value and lower than a second high-pressure protection value, otherwise, the controller controls the compressor of the air conditioner to be switched off.
5. The control system of claim 4,
and the rotating speed output by the fan is calibrated in advance according to the pressure value measured by the pressure sensor.
6. A vehicle characterized by comprising a control system according to claim 4 or 5.
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| CN201810350255.9A CN108674123B (en) | 2018-04-18 | 2018-04-18 | Control method and control system of vehicle air conditioner and vehicle |
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| CN201810350255.9A CN108674123B (en) | 2018-04-18 | 2018-04-18 | Control method and control system of vehicle air conditioner and vehicle |
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| CN108674123B true CN108674123B (en) | 2020-07-28 |
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| CN111114245A (en) * | 2020-01-09 | 2020-05-08 | 东风商用车有限公司 | Vehicle idling air conditioner control method and control system |
| CN112248744A (en) * | 2020-09-30 | 2021-01-22 | 广西玉柴机器股份有限公司 | Control system of vehicle air conditioner |
| CN113695980A (en) * | 2021-08-06 | 2021-11-26 | 珠海格力智能装备有限公司 | Purification mechanism, cooling machine and purification detection method |
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