CN117465199A - Protection control method and device for vehicle-mounted compressor, vehicle-mounted air conditioner and vehicle - Google Patents

Protection control method and device for vehicle-mounted compressor, vehicle-mounted air conditioner and vehicle Download PDF

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Publication number
CN117465199A
CN117465199A CN202311444807.XA CN202311444807A CN117465199A CN 117465199 A CN117465199 A CN 117465199A CN 202311444807 A CN202311444807 A CN 202311444807A CN 117465199 A CN117465199 A CN 117465199A
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China
Prior art keywords
compressor
current
current protection
value
controlling
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Pending
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CN202311444807.XA
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Chinese (zh)
Inventor
冯晓芳
杜鑫龙
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Zhejiang Geely Holding Group Co Ltd
Zhejiang Zeekr Intelligent Technology Co Ltd
Original Assignee
Zhejiang Geely Holding Group Co Ltd
Zhejiang Zeekr Intelligent Technology Co Ltd
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Priority to CN202311444807.XA priority Critical patent/CN117465199A/en
Publication of CN117465199A publication Critical patent/CN117465199A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • 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
    • B60H1/00978—Control systems or circuits characterised by failure of detection or safety means; Diagnostic methods
    • 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
    • B60H1/3225—Cooling devices using compression characterised by safety arrangements, e.g. compressor anti-seizure means or by signalling devices
    • 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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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a protection control method and device of a vehicle-mounted compressor, a vehicle-mounted air conditioner and a vehicle, wherein the method comprises the following steps: in the process of controlling the power converter to drive the compressor to work, acquiring the temperature of a switching tube in the power converter, the current of the compressor and the rotating speed of the compressor; determining a current protection limit value and a current protection restoration value of the compressor based on the temperature; and performing overcurrent protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotating speed. The method can enable the overcurrent protection function of the compressor to be more comprehensive, so that the method is suitable for various complex environments, and the safety of the vehicle-mounted compressor is improved.

Description

Protection control method and device for vehicle-mounted compressor, vehicle-mounted air conditioner and vehicle
Technical Field
The invention relates to the field of compressor protection, in particular to a protection control method and device for a vehicle-mounted compressor, a vehicle-mounted air conditioner and a vehicle.
Background
With the development of vehicle technology, as a part of vehicle-mounted equipment, a control logic of the compressor is increasingly complex, on-off control of an internal switching tube is also more frequent, and thus, higher requirements are placed on overcurrent protection performance of the compressor. However, in the current over-current protection method of the compressor in the related art, a fixed current threshold is generally adopted to determine whether the compressor is over-current, so that the compressor cannot adapt to a complex working environment, and the compressor still has an over-current risk in part of scenes, so that the safety of the compressor is relatively low.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a protection control method for a vehicle-mounted compressor, in which during controlling a power converter to drive the compressor to operate, a current protection limit value and a current protection recovery value of the compressor are determined based on a temperature of a switching tube in the power converter of the compressor, and the compressor is over-current protected according to the current protection limit value, the current protection recovery value, the current and the rotation speed, so that an over-current risk of the compressor can be comprehensively determined based on the temperature of the switching tube, the current and the rotation speed of the compressor, and corresponding over-current protection measures are made, so that the over-current protection function of the compressor is more comprehensive, and the method is suitable for various complex environments, and the safety of the vehicle-mounted compressor is improved.
A second object of the present invention is to provide a vehicle-mounted air conditioner.
A third object of the present invention is to provide a protection control device for a vehicle-mounted compressor.
A fourth object of the present invention is to propose a vehicle.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a protection control method for a vehicle-mounted compressor, including: in the process of controlling the power converter to drive the compressor to work, acquiring the temperature of a switching tube in the power converter, the current of the compressor and the rotating speed of the compressor; determining a current protection limit value and a current protection restoration value of the compressor based on the temperature; and performing overcurrent protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotating speed.
According to the protection control method of the vehicle-mounted compressor, in the process of controlling the power converter to drive the compressor to work, the current protection limit value and the current protection recovery value of the compressor are determined based on the temperature of the switching tube in the power converter of the compressor, and the compressor is subjected to overcurrent protection according to the current protection limit value, the current protection recovery value, the current and the rotating speed, so that the overcurrent risk of the compressor can be comprehensively judged based on the temperature of the switching tube, the current and the rotating speed of the compressor, corresponding overcurrent protection measures are made, the overcurrent protection function of the compressor is more comprehensive, the method is suitable for various complex environments, and the safety of the vehicle-mounted compressor is improved.
According to one embodiment of the present invention, determining a current protection limit value and a current protection restoration value of a compressor based on temperature includes: determining a temperature interval in which the temperature is located; and determining a current protection limit value and a current protection recovery value according to the temperature interval, wherein different temperature intervals correspond to different current protection limit values and current protection recovery values.
According to one embodiment of the present invention, the over-current protection control for the compressor according to the current protection limit value, the current protection restoration value, the current and the rotation speed includes: under the condition that the rotating speed is smaller than or equal to a preset rotating speed threshold value, if the current is larger than or equal to a current protection limit value, controlling the current limiting operation of the compressor; when controlling the compressor to perform current limiting operation, if the current is smaller than or equal to a current protection restoration value, controlling the compressor to normally operate, wherein the current protection restoration value is smaller than a current protection limit value; if the current is larger than the current protection restoration value and smaller than the current protection limit value, controlling the compressor to stand by and operate, and when the current is smaller than or equal to the current protection restoration value, controlling the compressor to normally operate; and if the rotating speed is greater than or equal to a preset rotating speed threshold value, controlling the compressor to stop.
According to one embodiment of the present invention, the over-current protection control for the compressor according to the current protection limit value, the current protection restoration value, the current and the rotation speed includes: under the condition that the rotating speed is larger than a preset rotating speed threshold value, if the current is larger than or equal to a current protection limit value, controlling the current limiting operation of the compressor; when the current limiting operation of the compressor is controlled, if the current is smaller than or equal to the current protection recovery value, the compressor is controlled to recover operation, and when the rotating speed is larger than or equal to the target rotating speed, the compressor is controlled to normally operate; if the current is larger than the current protection restoration value and smaller than the current protection limit value, controlling the compressor to stand by and operate, and when the current is smaller than or equal to the current protection restoration value, controlling the compressor to resume operation, and when the rotating speed is larger than or equal to the target rotating speed, controlling the compressor to normally operate; and if the rotating speed is less than or equal to a preset rotating speed threshold value, controlling the compressor to stop.
According to one embodiment of the present invention, controlling compressor current limited operation includes: the rotational speed of the compressor is reduced.
According to one embodiment of the invention, the method further comprises: when the power is abnormally lost in the high voltage of the whole vehicle, the phase voltage of the compressor and the direct current bus voltage of the compressor are obtained; when the reduction rate of the phase voltage is larger than a preset rate threshold and the voltage of the direct current bus is smaller than a preset voltage threshold, the compressor is controlled to stop, and when the compressor is stopped for a preset time, the power converter is controlled to release back electromotive force generated by the compressor.
According to one embodiment of the present invention, a power converter includes a plurality of phase legs corresponding to the number of phases of a compressor, each phase leg including an upper leg and a lower leg, the power converter being controlled to release back electromotive force generated by the compressor, comprising: the switching tubes of the upper bridge arm are controlled to be all on, and the switching tubes of the lower bridge arm are controlled to be all off; or the switching tubes of the upper bridge arm are controlled to be all disconnected, and the switching tubes of the lower bridge arm are controlled to be all connected.
To achieve the above object, a second aspect of the present invention provides a vehicle-mounted air conditioner, including: a compressor; the protection control method of the vehicle-mounted compressor is realized when the processor executes the program, so as to perform protection control on the compressor.
According to the vehicle-mounted air conditioner provided by the embodiment of the invention, through the protection control method, the overcurrent protection function of the compressor can be more comprehensive and careful, so that the vehicle-mounted air conditioner is suitable for various complex environments, and the safety of the vehicle-mounted air conditioner is improved.
To achieve the above object, an embodiment of a third aspect of the present invention provides a protection control device for a vehicle-mounted compressor, the device including: the acquisition module is used for acquiring the temperature of a switching tube in the power converter, the current of the compressor and the rotating speed of the compressor in the process of controlling the power converter to drive the compressor to work; the determining module is used for determining a current protection limit value and a current protection recovery value of the compressor based on the temperature; and the control module is used for carrying out overcurrent protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotating speed.
According to the protection control device of the vehicle-mounted compressor, in the process of controlling the power converter to drive the compressor to work, the temperature of a switching tube in the power converter, the current of the compressor and the rotating speed of the compressor are obtained by the obtaining module, and then the current protection limit value and the current protection recovery value of the compressor are determined based on the temperature by the determining module; and finally, the control module performs overcurrent protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotating speed, so that the overcurrent protection function of the compressor is more comprehensive, the compressor is suitable for various complex environments, and the safety of the compressor is improved.
In order to achieve the above object, a fourth aspect of the present invention provides a vehicle including the above-mentioned vehicle-mounted air conditioner, or the above-mentioned protection control device of the vehicle-mounted compressor.
According to the vehicle provided by the embodiment of the invention, through the vehicle-mounted air conditioner or the protection control device of the vehicle-mounted compressor, the overcurrent protection function of the compressor in the vehicle is more comprehensive, so that the vehicle is suitable for various complex environments, and the safety of the vehicle is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a protection control method of an in-vehicle compressor according to an embodiment of the present invention;
FIG. 2 is a flowchart of an over-current protection control method of a compressor according to an embodiment of the present invention;
fig. 3 is a flowchart of an overcurrent protection control method of a compressor according to another embodiment of the present invention;
fig. 4 is a flowchart of an overcurrent protection control method of a compressor according to still another embodiment of the present invention;
FIG. 5 is a schematic diagram of a current flow of a power converter according to one embodiment of the invention;
fig. 6 is a schematic structural view of an in-vehicle air conditioner according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a protection control device of an in-vehicle compressor according to an embodiment of the present invention;
fig. 8a to 8b are schematic structural views of a vehicle according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The protection control method of the vehicle-mounted compressor, the vehicle-mounted air conditioner, the protection control device of the vehicle-mounted compressor and the vehicle provided by the embodiment of the invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a protection control method of an in-vehicle compressor according to an embodiment of the present invention, referring to fig. 1, the method includes:
s11, acquiring the temperature of a switching tube in the power converter, the current of the compressor and the rotating speed of the compressor in the process of controlling the power converter to drive the compressor to work.
Specifically, the over-current protection function of the compressor is mainly used for avoiding the problem that the working temperature of a switching tube in the power converter is too high and burnt out due to the fact that the current of the compressor is too high. When the operating temperature of the switching tube is too high, it is obvious that the switching tube is more prone to overcurrent problems. Therefore, when the compressor is over-current protected, the temperature of the switching tube in the power converter and the current of the compressor need to be obtained first to comprehensively judge the over-current risk of the compressor. Meanwhile, when overcurrent protection measures are implemented on the compressor, the temperature of the internal switching tube is reduced, and the rotating speed of the compressor can influence the cooling speed of the switching tube, so that the rotating speed of the compressor needs to be obtained as a reference factor for overcurrent protection of the compressor in the process of controlling the power converter to drive the compressor to work.
And S12, determining a current protection limit value and a current protection recovery value of the compressor based on the temperature.
Specifically, the current protection limit value of the compressor refers to a preset threshold value for triggering the over-current protection of the compressor, and the current protection recovery value refers to a threshold value for recovering the compressor to a normal state after the over-current protection is triggered. When the current of the compressor rises to the current protection threshold value in the working process of the compressor, the overcurrent protection measures of the compressor are triggered, the current of the compressor is reduced at the moment, and when the current of the compressor is reduced to the current protection recovery value, the compressor is indicated to be recovered to a normal state, and the overcurrent protection measures of the compressor can be stopped. The current protection limit value and the current protection recovery value can be generally determined based on an overcurrent threshold value of the switching tube, wherein the overcurrent threshold value of the switching tube refers to a critical current value of the switching tube for normal operation, when the current of the switching tube exceeds the overcurrent threshold value, the switching tube is directly burnt out, and the overcurrent threshold value of the switching tube can be obtained through testing, table lookup and the like. In order to maintain a certain margin, the current protection limit value of the compressor can be set to 90% of the overcurrent threshold of the switching tube, and the current protection recovery value of the compressor can be set to 85% of the overcurrent threshold of the switching tube, so that the current of the compressor is ensured not to rise to the overcurrent threshold of the switching tube, and the safety of the compressor is improved.
Meanwhile, the specific value of the overcurrent threshold of the switching tube can be changed at different temperatures of the switching tube, and in general, when the temperature of the switching tube is increased, the overcurrent threshold of the switching tube can be reduced, and the corresponding current protection limit value and current protection recovery value can be reduced. Therefore, the current protection limit value and the current protection recovery value of the compressor can be determined based on the temperature, so that the accuracy of the current protection limit value and the current protection recovery value is ensured, and the reliability of the overcurrent protection function of the compressor is further improved.
Further, determining a current protection limit and a current protection restoration value of the compressor based on the temperature includes: determining a temperature interval in which the temperature is located; and determining a current protection limit value and a current protection recovery value according to the temperature interval, wherein different temperature intervals correspond to different current protection limit values and current protection recovery values.
Specifically, the temperature of the switching tube may be divided into a plurality of sections, for example, the temperature section of the switching tube may be divided into three sections, which are respectively smaller than the first temperature (T < T1), between the first temperature and the second temperature (T1 is less than or equal to T2), and larger than the second temperature (T is more than or equal to T2), and the current protection limit value and the current protection recovery value corresponding to the plurality of temperature sections are obtained by means of a pre-test or the like, and different temperature sections correspond to different current protection limit values and current protection recovery values. When the compressor actually works, a temperature interval corresponding to the temperature can be determined first, and then the corresponding current protection limit value and the corresponding current protection recovery value are determined in a table look-up mode and the like according to the temperature interval, so that the current protection limit value and the current protection recovery value of the compressor are determined based on the temperature.
And S13, performing overcurrent protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotating speed.
Specifically, after the current protection limit value and the current protection restoration value are determined according to the temperature, the compressor can be subjected to overcurrent protection control according to the current and the rotating speed of the compressor. The compressor current is mainly used for determining the trigger time and the end time of the overcurrent protection measures of the compressor, namely when the compressor current is larger than the current protection limit value, the compressor triggers the overcurrent protection measures, the compressor current drops, and when the compressor current drops to the current protection recovery value, the overcurrent protection measures are ended. In addition, because the cooling efficiency of the overcurrent protection measures can be influenced by the rotating speed of the compressor, the corresponding overcurrent protection measures can be formulated based on the rotating speed of the compressor so as to strengthen the effect of the overcurrent protection measures and further improve the safety of the compressor.
In the related art, the over-current protection of the compressor is generally realized through a fixed current threshold, that is, when the current of the compressor is greater than the fixed current threshold, the compressor stops running or is in a down-frequency operation, so that the switching tube is prevented from being burnt. However, the related art does not take into consideration the temperature change, and there is still a risk that the overcurrent protection switching tube is not triggered, i.e., burned, when the switching tube is operated at high temperature. Meanwhile, the related art does not consider factors such as the rotating speed of the compressor during the over-current protection control, so that the over-current protection effect may be poor, and after the over-current protection is triggered, the current of the compressor may be at risk of exceeding a current threshold value. In the embodiment of the invention, the corresponding current protection limit value and current protection recovery value can be determined according to the temperature of the switching tube, so that the overcurrent protection function can cover various temperature environments of the compressor, and meanwhile, the overcurrent protection control can be carried out on the compressor according to the rotating speed of the compressor, so that the current of the compressor is rapidly reduced, the fault of the compressor is avoided, and the safety of the compressor is effectively improved.
In the above embodiment, during the process of controlling the power converter to drive the compressor to work, the current protection limit value and the current protection recovery value of the compressor are determined based on the temperature of the switching tube in the power converter of the compressor, and the compressor is over-current protected according to the current protection limit value, the current protection recovery value, the current and the rotation speed, so that the over-current risk of the compressor can be comprehensively judged based on the temperature of the switching tube, the current and the rotation speed of the compressor, and corresponding over-current protection measures are made, so that the over-current protection function of the compressor is more comprehensive and is suitable for various complex environments, and the safety of the vehicle-mounted compressor is improved.
In some embodiments, referring to fig. 2, the over-current protection control of the compressor according to the current protection limit value, the current protection restoration value, the current and the rotation speed includes:
and S21, controlling the current limiting operation of the compressor if the current is greater than or equal to the current protection limit value under the condition that the rotating speed is less than or equal to the preset rotating speed threshold value.
Further, controlling the compressor current limiting operation includes: reducing the rotational speed of the compressor;
in particular, the current limiting operation means that the current of the compressor is reduced by reducing the set rotational speed of the compressor, the specific principle being not expanded here. The preset rotating speed threshold value is a rotating speed threshold value capable of enabling the current limiting operation to achieve the optimal cooling effect, when the rotating speed of the motor is smaller than the preset rotating speed threshold value, the current is reduced, the temperature of the switching tube can be rapidly reduced, and when the rotating speed of the motor is equal to the preset rotating speed threshold value, the optimal cooling effect is achieved. Therefore, when the rotating speed of the compressor is smaller than or equal to a preset rotating speed threshold value, if the current is larger than or equal to a current protection limit value, the current limiting operation of the compressor can be controlled, so that the temperature of the switching tube is quickly reduced, and the overcurrent protection of the compressor is realized.
S22, when the compressor is controlled to run in a current limiting mode, if the current is smaller than or equal to a current protection recovery value, the compressor is controlled to run normally, wherein the current protection recovery value is smaller than a current protection limit value.
S23, if the current is larger than the current protection restoration value and smaller than the current protection limit value, controlling the compressor to stand-by operation, and when the current is smaller than or equal to the current protection restoration value, controlling the compressor to normally operate.
In particular, after controlling the compressor current limiting operation, the compressor current may drop slowly or drop rapidly, for which it is necessary to control the compressor based on the current drop speed. When the current of the compressor is rapidly reduced, the current of the compressor may be directly suddenly changed to be less than or equal to the current protection recovery value, and the compressor is not over-current risk at this time, so that the normal operation of the compressor can be controlled. When the current of the compressor slowly drops, the current of the compressor can firstly drop to a section between the current protection recovery value and the current protection limit value, namely, the current is larger than the current protection recovery value and smaller than the current protection limit value, at the moment, the slow dropping speed can cause heat accumulation of a power converter in the compressor to further cause damage of the compressor, therefore, the standby operation of the compressor can be controlled at the moment, the current of the compressor can drop rapidly, and when the current is smaller than or equal to the current protection recovery value, the compressor can be controlled to operate normally again, so that the compressor can work normally. The mode can avoid the possible overheating problem of the compressor caused by slow current drop of the compressor, thereby improving the safety of the compressor.
And S24, if the rotating speed is greater than or equal to a preset rotating speed threshold value, controlling the compressor to stop.
Specifically, when the compressor is controlled to run at a current limit, the rotation speed of the compressor should be gradually reduced, so that if the rotation speed of the compressor is greater than or equal to a preset rotation speed threshold value in the current limit running process, the compressor may run abnormally, and at the moment, the compressor can be controlled to stop, so that the damage to the compressor is avoided, and the safety of the compressor is improved.
As a specific embodiment, referring to fig. 3, when the rotational speed of the compressor is greater than a preset rotational speed threshold, the method for controlling over-current protection of the compressor according to the embodiment of the present invention may include:
s101, acquiring current of a compressor;
s102, judging whether the current of the compressor is larger than a current protection limit value, if so, executing S103, and if not, returning to S101;
s103, controlling the compressor to run at a limited current, and executing S104;
s104, judging whether the rotation speed of the compressor is greater than or equal to a preset rotation speed threshold, if so, executing S105, and if not, executing S106;
s105, controlling the compressor to stop running.
S106, judging whether the current of the compressor is larger than a current protection recovery value and smaller than a current protection limit value, if so, executing S107, and if not, executing S108;
s107, controlling the compressor to stand by and run, and returning to S106;
s108, judging whether the current of the compressor is less than or equal to a current protection recovery value, if so, executing S109, and if not, returning to S103;
s109, controlling the compressor to normally operate.
In some embodiments, referring to fig. 4, the over-current protection control of the compressor according to the current protection limit value, the current protection restoration value, the current and the rotation speed includes:
and S31, if the rotating speed is larger than a preset rotating speed threshold value, controlling the compressor to perform current limiting operation if the current is larger than or equal to a current protection limit value.
Specifically, when the rotation speed is greater than the preset rotation speed threshold, if the current is greater than or equal to the current protection limit value, the current limiting operation of the compressor can be controlled to protect the compressor.
S32, when the current limiting operation of the compressor is controlled, if the current is smaller than or equal to the current protection recovery value, the compressor is controlled to recover operation, and when the rotating speed is larger than or equal to the target rotating speed, the compressor is controlled to normally operate.
And S33, if the current is larger than the current protection restoration value and smaller than the current protection limit value, controlling the compressor to stand-by operation, controlling the compressor to restore operation when the current is smaller than or equal to the current protection restoration value, and controlling the compressor to normally operate when the rotating speed is larger than or equal to the target rotating speed.
Specifically, when the compressor is controlled to run at the current limit, the compressor current may change slowly or quickly, and at this time, if the current is still greater than the current protection recovery value and less than the current protection limit value, the compressor current is slowly decreased, and the compressor still has the risk of damage caused by heat accumulation, so that the compressor can be controlled to run at standby to quickly reduce the compressor current, and the current safety is protected. And if the current is less than or equal to the current protection recovery value, controlling the compressor to recover to operate so as to recover the compressor to a normal operation state.
After the compressor is restored to the normal running state, the compressor can not be restored to the original rotating speed due to the fact that the rotating speed of the compressor is high in the original normal running state. Therefore, after the compressor resumes operation, the compressor rotation speed may be continuously monitored in real time to determine whether the compressor reaches the target rotation speed, where the target rotation speed is a requested rotation speed after the compressor resumes operation, and the requested rotation speed may be a preset rotation speed of the compressor working mode or a rotation speed manually input by a user, which is not limited herein. When the rotating speed rises to be more than or equal to the target rotating speed, the compressor can be restored to a normal state, and the normal operation of the compressor can be continuously controlled at the moment; if the rotation speed of the compressor can not be increased to the target rotation speed all the time within the preset time, the rotation speed fault of the compressor can be determined at the moment, and the compressor can be directly controlled to stop running so as to avoid larger faults.
And S34, if the rotating speed is less than or equal to a preset rotating speed threshold value, controlling the compressor to stop.
Specifically, if the rotation speed of the compressor is less than or equal to the preset rotation speed threshold value during the process of controlling the compressor to run at the current limit, the system faults are usually indicated in aspects of refrigerant flow, valve opening and the like in the compressor. The compressor is reduced in rotation speed due to the current limiting operation and the standby operation of the compressor, and the preset rotation speed threshold is the rotation speed with the best cooling effect of the compressor. Therefore, in this case, the subsequent current-limiting operation or standby operation of the compressor will not strengthen the heat dissipation effect of the compressor, but rather weaken the heat dissipation effect, and the compressor has a greater risk of overheating, so that the compressor can be controlled to stop so as to further improve the safety of the compressor.
In some embodiments, the method further comprises: when the power is abnormally lost in the high voltage of the whole vehicle, the phase voltage of the compressor and the direct current bus voltage of the compressor are obtained; when the reduction rate of the phase voltage is larger than a preset rate threshold and the voltage of the direct current bus is smaller than a preset voltage threshold, the compressor is controlled to stop, and when the compressor is stopped for a preset time, the power converter is controlled to release back electromotive force generated by the compressor.
Specifically, the abnormal power failure of the whole vehicle is one of typical faults of the vehicle, when the abnormal power failure of the whole vehicle of the vehicle occurs, reverse electromotive force can occur in a switching tube of the compressor, and when the reverse electromotive force is too high, the switching tube can be damaged. Therefore, in this case, the phase voltage of the compressor and the dc bus voltage of the compressor may be obtained first, and when the rate of decrease of the phase voltage is greater than the preset rate threshold and the dc bus voltage is less than the preset voltage threshold, this indicates that there is a risk of failure of the switching tube. At this time, the compressor can be directly controlled to stop, and the power converter is controlled to release the back electromotive force generated by the compressor when the compressor is stopped for a preset time, so that the safety of a switching tube in the compressor is protected.
For example, when the compressor is a vehicle-mounted three-phase motor, the preset speed threshold may be 250V/s and the preset voltage threshold may be 80V. When the vehicle is abnormally powered down at a high voltage, the phase voltage reduction rate and the direct current bus voltage can be detected every 50us, and when the reduction rate of the phase voltage is not detected to be larger than a preset rate threshold value and the direct current bus voltage is smaller than a preset voltage threshold value, normal overcurrent protection measures of the vehicle-mounted compressor can be maintained; when the reduction rate of the phase voltage is detected to be larger than the preset rate threshold value and the voltage of the direct current bus is detected to be smaller than the preset voltage threshold value, the compressor can be controlled to stop firstly, and after the compressor stops for about 2 seconds, the power converter is controlled to release the back electromotive force generated by the compressor, so that the safety of a switching tube of the compressor is protected, and the safety of the compressor is improved.
In some embodiments, the power converter includes a plurality of phase legs corresponding to the number of phases of the compressor, each phase leg including an upper leg and a lower leg, the power converter being controlled to release back emf generated by the compressor, comprising: the switching tubes of the upper bridge arm are controlled to be all on, and the switching tubes of the lower bridge arm are controlled to be all off; or the switching tubes of the upper bridge arm are controlled to be all disconnected, and the switching tubes of the lower bridge arm are controlled to be all connected.
Specifically, taking the example that the power converter includes three-phase bridge arms below, referring to fig. 5, each phase bridge arm (U-phase, V-phase, W-phase) in the power converter includes an upper bridge arm and a lower bridge arm, where the upper bridge arm and the lower bridge arm respectively include 1 switching tube, when the back electromotive force generated by the compressor needs to be released, all the switching tubes of the upper bridge arm in the three-phase bridge arm can be controlled to be turned on, and all the switching tubes of the lower bridge arm are controlled to be turned off. At this time, a current loop as shown in fig. 5 can be formed in the power converter, and each phase of bridge arm forms an energizing loop for the motor, so that the back electromotive force generated by the compressor can be released through the three loops, the energy of the back electromotive force can be dissipated in the form of heat energy, the switching tube is not damaged, and the safety of the compressor is further protected.
When the back electromotive force generated by the compressor needs to be released, all the lower bridge arm switching tubes in the three-phase bridge arms can be controlled to be conducted, all the upper bridge arm switching tubes are controlled to be turned off, and the effect of releasing the back electromotive force can be achieved.
In summary, according to the protection control method of the vehicle-mounted compressor provided by the embodiment of the invention, in the process of controlling the power converter to drive the compressor to work, the current protection limit value and the current protection recovery value of the compressor are determined based on the temperature of the switching tube in the power converter of the compressor, and the compressor is subjected to overcurrent protection according to the current protection limit value, the current protection recovery value, the current and the rotating speed, so that the overcurrent risk of the compressor can be comprehensively judged based on the temperature of the switching tube, the current and the rotating speed of the compressor, and corresponding overcurrent protection measures are made, so that the overcurrent protection function of the compressor is more comprehensive and is suitable for various complex environments; meanwhile, under the condition of abnormal high voltage of the whole vehicle, the phase voltage of the compressor and the direct current bus voltage of the compressor are obtained; when the reduction rate of the phase voltage is larger than a preset rate threshold and the voltage of the direct current bus is smaller than a preset voltage threshold, the compressor is controlled to stop, and when the compressor is stopped for a preset time, the power converter is controlled to release back electromotive force generated by the compressor, so that the safety of the compressor is protected, and the safety of the compressor is effectively improved.
Corresponding to the above embodiment, the embodiment of the present invention further provides a vehicle-mounted air conditioner, referring to fig. 6, the air conditioner 100 includes: a compressor 110; the protection control method for the vehicle-mounted compressor is implemented by the memory 120, the processor 130 and a program stored in the memory 120 and capable of running on the processor 130, when the processor 130 executes the program, so as to perform protection control on the compressor 120.
According to the vehicle-mounted air conditioner provided by the embodiment of the invention, the risk of overcurrent of the compressor in the vehicle-mounted air conditioner under various complex environments and the risk of damage of the switch tube under the condition that the vehicle is powered down under high voltage can be effectively reduced by the protection control method, so that the safety of the vehicle-mounted air conditioner is improved.
Corresponding to the above embodiment, the embodiment of the present invention further provides a protection control device for a vehicle-mounted compressor, as shown in fig. 7, the device 200 includes: an acquisition module 210, a determination module 220, and a control module 230.
The obtaining module 210 is configured to obtain a temperature of a switching tube in the power converter, a current of the compressor, and a rotational speed of the compressor during controlling the power converter to drive the compressor to operate; the determining module 220 is configured to determine a current protection limit value and a current protection restoration value of the compressor based on the temperature; the control module 230 is configured to perform over-current protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotation speed.
According to one embodiment of the invention, the determining module 220 is further configured to: determining a temperature interval in which the temperature is located; and determining a current protection limit value and a current protection recovery value according to the temperature interval, wherein different temperature intervals correspond to different current protection limit values and current protection recovery values.
According to one embodiment of the invention, the control module 230 is further configured to: under the condition that the rotating speed is smaller than or equal to a preset rotating speed threshold value, if the current is larger than or equal to a current protection limit value, controlling the current limiting operation of the compressor; when controlling the compressor to perform current limiting operation, if the current is smaller than or equal to a current protection restoration value, controlling the compressor to normally operate, wherein the current protection restoration value is smaller than a current protection limit value; if the current is larger than the current protection restoration value and smaller than the current protection limit value, controlling the compressor to stand by and operate, and when the current is smaller than or equal to the current protection restoration value, controlling the compressor to normally operate; and if the rotating speed is greater than or equal to a preset rotating speed threshold value, controlling the compressor to stop.
According to one embodiment of the invention, the control module 230 is further configured to: under the condition that the rotating speed is larger than a preset rotating speed threshold value, if the current is larger than or equal to a current protection limit value, controlling the current limiting operation of the compressor; when the current limiting operation of the compressor is controlled, if the current is smaller than or equal to the current protection recovery value, the compressor is controlled to recover operation, and when the rotating speed is larger than or equal to the target rotating speed, the compressor is controlled to normally operate; if the current is larger than the current protection restoration value and smaller than the current protection limit value, controlling the compressor to stand by and operate, and when the current is smaller than or equal to the current protection restoration value, controlling the compressor to resume operation, and when the rotating speed is larger than or equal to the target rotating speed, controlling the compressor to normally operate; and if the rotating speed is less than or equal to a preset rotating speed threshold value, controlling the compressor to stop.
According to one embodiment of the invention, the control module 230 is further configured to: reducing the rotational speed of the compressor;
according to one embodiment of the invention, the acquisition module 210 is further configured to: when the power is abnormally lost in the high voltage of the whole vehicle, the phase voltage of the compressor and the direct current bus voltage of the compressor are obtained; the control module 230 is also configured to: when the reduction rate of the phase voltage is larger than a preset rate threshold and the voltage of the direct current bus is smaller than a preset voltage threshold, the compressor is controlled to stop, and when the compressor is stopped for a preset time, the power converter is controlled to release back electromotive force generated by the compressor.
According to one embodiment of the invention, the power converter comprises a plurality of phase legs corresponding to the number of phases of the compressor, each phase leg comprising an upper leg and a lower leg, the control module 230 further being configured to: the switching tubes of the upper bridge arm are controlled to be all on, and the switching tubes of the lower bridge arm are controlled to be all off; or the switching tubes of the upper bridge arm are controlled to be all disconnected, and the switching tubes of the lower bridge arm are controlled to be all connected.
It should be noted that, for the description of the protection control device of the vehicle-mounted compressor according to the embodiment of the present invention, please refer to the above description of the protection control method of the vehicle-mounted compressor, and the description is omitted herein.
According to the protection control device of the vehicle-mounted compressor, in the process of controlling the power converter to drive the compressor to work, the acquisition module and the determination module are utilized to determine the current protection limit value and the current protection restoration value of the compressor based on the temperature of the switching tube in the power converter of the compressor, and the control module is utilized to carry out overcurrent protection on the compressor according to the current protection limit value, the current protection restoration value, the current and the rotating speed, so that the overcurrent risk of the compressor can be comprehensively judged based on the temperature of the switching tube, the current and the rotating speed of the compressor, corresponding overcurrent protection measures are made, and the overcurrent protection function of the compressor is more comprehensive and is suitable for various complex environments; meanwhile, under the condition of abnormal high voltage of the whole vehicle, the phase voltage of the compressor and the direct current bus voltage of the compressor are obtained by using an obtaining module; when the reduction rate of the phase voltage is larger than a preset rate threshold value and the voltage of the direct current bus is smaller than a preset voltage threshold value, the control module is used for controlling the compressor to stop, and when the compressor is stopped for a preset time, the power converter is controlled to release back electromotive force generated by the compressor, so that the safety of the compressor is protected, and the safety of the compressor is effectively improved.
Corresponding to the above-described embodiments, the present invention also provides a vehicle, and referring to fig. 8a to 8b, the vehicle 1000 includes the aforementioned vehicle-mounted air conditioner 100, or the aforementioned protection control device 200 of the vehicle-mounted compressor.
According to the vehicle provided by the embodiment of the invention, through the vehicle-mounted air conditioner or the protection control device of the vehicle-mounted compressor, the overcurrent risk of the compressor in the vehicle under various complex environments can be effectively reduced, and the damage risk of the compressor is reduced under the condition that the vehicle is powered down at high voltage, so that the safety of the vehicle is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A protection control method of a vehicle-mounted compressor, the method comprising:
in the process of controlling a power converter to drive the compressor to work, acquiring the temperature of a switching tube in the power converter, the current of the compressor and the rotating speed of the compressor;
determining a current protection limit value and a current protection restoration value of the compressor based on the temperature;
and performing overcurrent protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotating speed.
2. The method of claim 1, wherein the determining a current protection limit and a current protection restoration value for the compressor based on the temperature comprises:
determining a temperature interval in which the temperature is located;
and determining the current protection limit value and the current protection recovery value according to the temperature interval, wherein different temperature intervals correspond to different current protection limit values and current protection recovery values.
3. The method of claim 1, wherein said over-current protection control of said compressor based on said current protection limit, said current protection restoration value, said current, and said rotational speed comprises:
if the rotating speed is smaller than or equal to a preset rotating speed threshold value, controlling the compressor to run in a current limiting mode if the current is larger than or equal to the current protection limit value;
when controlling the compressor to run at the current limit, if the current is smaller than or equal to the current protection restoration value, controlling the compressor to run normally, wherein the current protection restoration value is smaller than the current protection limit value;
if the current is larger than the current protection restoration value and smaller than the current protection limit value, controlling the compressor to stand by to operate, and controlling the compressor to normally operate when the current is smaller than or equal to the current protection restoration value;
and if the rotating speed is greater than or equal to the preset rotating speed threshold value, controlling the compressor to stop.
4. The method of claim 1, wherein said over-current protection control of said compressor based on said current protection limit, said current protection restoration value, said current, and said rotational speed comprises:
if the rotating speed is larger than a preset rotating speed threshold value, controlling the compressor to run at a current limit if the current is larger than or equal to the current protection limit value;
when the current limiting operation of the compressor is controlled, if the current is smaller than or equal to the current protection recovery value, the compressor is controlled to resume operation, and when the rotating speed is larger than or equal to a target rotating speed, the compressor is controlled to normally operate;
if the current is larger than the current protection recovery value and smaller than the current protection limit value, controlling the compressor to stand by and operate, and controlling the compressor to resume operation when the current is smaller than or equal to the current protection recovery value and controlling the compressor to normally operate when the rotating speed is larger than or equal to a target rotating speed;
and if the rotating speed is less than or equal to the preset rotating speed threshold value, controlling the compressor to stop.
5. The method of claim 3 or 4, wherein said controlling said compressor current limit operation comprises:
the rotational speed of the compressor is reduced.
6. The method according to claim 1, wherein the method further comprises:
when the power is abnormally lost in the high voltage of the whole vehicle, the phase voltage of the compressor and the direct current bus voltage of the compressor are obtained;
and when the reduction rate of the phase voltage is larger than a preset rate threshold and the direct current bus voltage is smaller than a preset voltage threshold, controlling the compressor to stop, and controlling the power converter to release back electromotive force generated by the compressor when the compressor stops for a preset time.
7. The method of claim 6, wherein the power converter includes a plurality of phase legs corresponding to the number of phases of the compressor, each phase leg including an upper leg and a lower leg, the controlling the power converter to release back emf generated by the compressor comprising:
the switching tubes of the upper bridge arm are controlled to be all on, and the switching tubes of the lower bridge arm are controlled to be all off; or,
and controlling the switching tubes of the upper bridge arm to be all disconnected and controlling the switching tubes of the lower bridge arm to be all conducted.
8. A vehicle-mounted air conditioner, characterized by comprising:
a compressor;
the protection control method for the vehicle-mounted compressor according to any one of claims 1 to 7 is realized when the processor executes the program, so as to perform protection control on the compressor.
9. A protection control device of a vehicle-mounted compressor, characterized by comprising:
the acquisition module is used for acquiring the temperature of a switching tube in the power converter, the current of the compressor and the rotating speed of the compressor in the process of controlling the power converter to drive the compressor to work;
a determining module for determining a current protection limit and a current protection restoration value of the compressor based on the temperature;
and the control module is used for carrying out overcurrent protection control on the compressor according to the current protection limit value, the current protection recovery value, the current and the rotating speed.
10. A vehicle comprising the in-vehicle air conditioner according to claim 8, or the protection control device of the in-vehicle compressor according to claim 9.
CN202311444807.XA 2023-10-31 2023-10-31 Protection control method and device for vehicle-mounted compressor, vehicle-mounted air conditioner and vehicle Pending CN117465199A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311444807.XA CN117465199A (en) 2023-10-31 2023-10-31 Protection control method and device for vehicle-mounted compressor, vehicle-mounted air conditioner and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311444807.XA CN117465199A (en) 2023-10-31 2023-10-31 Protection control method and device for vehicle-mounted compressor, vehicle-mounted air conditioner and vehicle

Publications (1)

Publication Number Publication Date
CN117465199A true CN117465199A (en) 2024-01-30

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