CN112248762A - Temperature protection method and device for variable frequency compressor of new energy automobile - Google Patents
Temperature protection method and device for variable frequency compressor of new energy automobile Download PDFInfo
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- CN112248762A CN112248762A CN202011038273.7A CN202011038273A CN112248762A CN 112248762 A CN112248762 A CN 112248762A CN 202011038273 A CN202011038273 A CN 202011038273A CN 112248762 A CN112248762 A CN 112248762A
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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
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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
- B60H1/3225—Cooling devices using compression characterised by safety arrangements, e.g. compressor anti-seizure means or by signalling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention discloses a temperature protection method and a temperature protection device for a variable frequency compressor of a new energy automobile, wherein the temperature protection method comprises the following steps: dividing various temperature intervals; detecting the temperature value of the variable-frequency compressor radiator in real time; and executing a preset control strategy according to the temperature interval where the temperature value is located. According to the invention, by adding the processing of temperature interval division and the judgment of temperature change, the fault state of the compressor and even the air conditioning system can be judged and pre-judged more accurately and timely, so that the problem of untimely or over-protection is effectively avoided, the whole vehicle cooling system is ensured to work more stably, and the human body comfort and the whole vehicle safety are improved.
Description
Technical Field
The invention relates to the technical field of air-conditioning compressors of new energy vehicles, in particular to a temperature protection method and device for a variable-frequency compressor of a new energy vehicle.
Background
Automotive construction has become the "pillar industry" in the economic construction of an economy. The continuous rising of the automobile holding capacity not only brings crisis to energy, but also brings great harm to the environment by tail gas discharged by the traditional automobile. Energy conservation, environmental protection and safety are the main trends of automobile development.
With the development of new energy automobiles in recent years, the automobile industry has become a well-known future trend in electromotion, networking, intellectualization and sharing. Based on this, the requirements and standards of the host factory for the products are continuously improved, and mainly embodied in the aspects of hardware specification, performance, software intellectualization and the like. From the initial use of the energy rules, more and more attention is paid to performance stability, electromagnetic compatibility standards and informatization.
The air conditioner is a key part which is not needed to be reduced, and is not only related to the comfort of a human body, but also related to the cooling of heating parts such as a vehicle-mounted battery pack and the like. Meanwhile, the compressor is also a second energy consumption component in the whole vehicle, so that the development of a stable, energy-saving and intelligent information compressor driver is of great importance to the whole new energy electric vehicle. Especially compressor drive stability is of the greatest importance. It is conceivable that not only comfort but also overall vehicle safety is lost in the event of failure of the cooling system.
The new energy automobile air conditioning system is a complex system, the automobile using environment is more complex and changeable, the temperature of a body radiator and the voltage and the current can be detected when a compressor driver works, and when the corresponding temperature, the voltage and the current exceed the set fixed threshold values, the compressor driver enters shutdown protection and waits for the alarm condition to remove and recover the operation.
Since the voltage and the current may be collected by the vehicle controller and transmitted to the compressor driver, the protection may be performed according to the set threshold value under normal circumstances, but as mentioned above, the complexity of the air conditioning system, such as the mechanical characteristics of the two units, the pipeline, the expansion valve, the electronic fan, the refrigerant, the refrigeration oil, and the compressor mechanism body, is different in their respective characteristics, the matching degree is different, and the usage environment is variable, so that the temperature protection threshold value control strategy in a fixed manner may cause a shortage in protection. Thereby increasing the risk of compressor damage. In certain specific cases, the compressor may have started to be damaged without reaching the protection temperature, which greatly reduces the service life of the compressor and, correspondingly, the stability of the cooling system, thus bringing about comfort and safety risks.
Disclosure of Invention
The invention provides a temperature protection method and device for a variable frequency compressor of a new energy automobile, which can solve the problem of the prior art that the compressor touches the protection temperature.
In order to solve the above problem, in a first aspect, the present invention provides a temperature protection method for a variable frequency compressor of a new energy vehicle, including:
dividing various temperature intervals;
detecting the temperature value of the variable-frequency compressor radiator in real time;
and executing a preset control strategy according to the temperature interval where the temperature value is located.
Wherein the plurality of temperature intervals comprises a first temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located comprises the following steps:
when the temperature value is smaller than a preset over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval;
and receiving and executing the rotating speed command of the whole vehicle controller.
Wherein the plurality of temperature intervals further comprises a second temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located further comprises:
when the temperature value is greater than or equal to a preset over-temperature speed regulation threshold value, determining that the temperature value is in the second temperature interval;
regulating the rotating speed to a preset speed-limiting target rotating speed;
and if the temperature value is smaller than the over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval and executing according to a logic strategy corresponding to the first temperature interval.
Wherein the plurality of temperature intervals further comprises a third temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located further comprises:
when the compressor runs, if the temperature value is increased to be greater than or equal to a preset first temperature value and the increased temperature value is greater than or equal to a preset second temperature value within a preset first time, determining that the temperature value is in a third temperature interval;
controlling the compressor to stop and reporting an over-temperature alarm, adding 1 to a first counter, and resuming starting after a preset minimum stop interval;
when the first counter is equal to a preset first threshold value, locking and carrying out fault alarm, and restoring normal operation by power failure;
when the compressor runs, if the temperature value is increased to be smaller than a preset first temperature value or the increased temperature value is smaller than a preset second temperature value within a preset time, the first count is cleared by 0.
Wherein the plurality of temperature intervals further comprises a fourth temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located further comprises:
if the temperature value is greater than or equal to a preset over-temperature shutdown threshold value, determining that the temperature value is in the fourth temperature interval;
controlling the compressor to stop and reporting an over-temperature alarm;
if the over-temperature alarm occurs within the preset second time, the second counter is increased by 1;
when the second counter is equal to a preset second threshold value, locking is carried out, and normal operation is recovered through power failure;
if the second counter is 1, starting operation for a preset number of times and no over-temperature alarm occurs after the preset third time, and clearing 0 by the second counter;
and if the temperature value is smaller than a preset over-temperature shutdown recovery value, determining that the temperature value is in the first temperature interval and executing according to a logic strategy corresponding to the first temperature interval.
The over-temperature shutdown threshold value is larger than the over-temperature shutdown recovery value and larger than the over-temperature speed regulation threshold value and larger than the over-temperature speed regulation recovery value.
The second aspect provides a temperature protection device for a variable frequency compressor of a new energy automobile, which comprises a dividing module, a detection module and an execution module;
the dividing module is used for dividing various temperature intervals;
the detection module is used for detecting the temperature value of the variable frequency compressor radiator in real time;
the execution module is used for executing a preset control strategy according to the temperature interval where the temperature value is located.
The plurality of temperature intervals comprise a first temperature interval, a second temperature interval, a third temperature interval and a fourth temperature interval;
the execution module comprises a first temperature execution submodule, a second temperature execution submodule, a third temperature execution submodule and a fourth temperature execution submodule;
the first temperature execution submodule is used for determining that the temperature value is in the first temperature interval when the temperature value is smaller than a preset over-temperature speed regulation recovery value; receiving and executing a rotating speed instruction of the whole vehicle controller;
the second temperature execution sub-module is used for determining that the temperature value is in the second temperature interval when the temperature value is greater than or equal to a preset over-temperature speed regulation threshold value; regulating the rotating speed to a preset speed-limiting target rotating speed; if the temperature value is smaller than the over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval, transferring to a first temperature execution sub-module, and executing according to a logic strategy corresponding to the first temperature interval;
the third temperature execution submodule is used for determining that the temperature value is in a third temperature interval if the temperature value is increased to be greater than or equal to a preset first temperature value and the increased temperature value is greater than or equal to a preset second temperature value within a preset first time when the compressor runs; controlling the compressor to stop and reporting an over-temperature alarm, adding 1 to a first counter, and resuming starting after a preset minimum stop interval; when the first counter is equal to a preset first threshold value, locking and carrying out fault alarm, and restoring normal operation by power failure; when the compressor runs, if the temperature value is increased to be smaller than a preset first temperature value or the increased temperature value is smaller than a preset second temperature value within a preset time, the first count is cleared by 0;
the fourth temperature execution sub-module is used for determining that the temperature value is in the fourth temperature interval when the temperature value is greater than or equal to a preset over-temperature shutdown threshold value; controlling the compressor to stop and reporting an over-temperature alarm; if the over-temperature alarm occurs within the preset second time, the second counter is increased by 1; when the second counter is equal to a preset second threshold value, locking is carried out, and normal operation is recovered through power failure; if the second counter is 1, starting operation for a preset number of times and no over-temperature alarm occurs after the preset third time, and clearing 0 by the second counter; and if the temperature value is smaller than a preset over-temperature shutdown recovery value, determining that the temperature value is in the first temperature interval, transferring to a first temperature execution sub-module, and executing according to a logic strategy corresponding to the first temperature interval.
The over-temperature shutdown threshold value is larger than the over-temperature shutdown recovery value and larger than the over-temperature speed regulation threshold value and larger than the over-temperature speed regulation recovery value.
In a third aspect, a computer-readable storage medium is provided, where a plurality of instructions are stored in the storage medium, and the instructions are adapted to be loaded by a processor to execute a method for protecting a temperature of an inverter compressor of a new energy vehicle as described in any one of the above.
The invention has the beneficial effects that:
through the processing of increasing the temperature interval division and the judgment of increasing the temperature change, the fault state of the compressor and even the air conditioning system can be judged and prejudged more accurately and timely, so that the problem of untimely or over-protection is effectively avoided, the whole vehicle cooling system is ensured to work stably better, and the human body comfort and the whole vehicle safety are improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present disclosure, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The invention aims to provide a temperature protection method and a temperature protection device for a variable frequency compressor of a new energy automobile, which are improved and optimized on the basis of a traditional method for setting a fixed shutdown temperature protection threshold value, and comprehensively consider various factors influencing the normal operation of an air conditioning system to the greatest extent. According to the temperature interval and the temperature rise rate of the driver radiator, the optimal rotating speed adjustment and protection processing are carried out, so that the defect that the compressor is not protected timely or is protected excessively due to various reasons is overcome.
The temperature protection method of the inverter compressor of the new energy automobile comprises the following steps of S1-S3:
s1, dividing various temperature intervals; the plurality of temperature intervals comprise a first temperature interval, a second temperature interval, a third temperature interval and a fourth temperature interval.
In this embodiment, four different intervals are divided. The first temperature interval can also be called a temperature green area, the second temperature interval can also be called a temperature yellow area, the third temperature interval can also be called a temperature orange area, and the fourth temperature interval can also be called a temperature red area.
And S2, detecting the temperature value of the variable frequency compressor radiator in real time.
In this embodiment, the temperature value of the heat sink is detected in real time by a driver in the compressor.
And S3, executing a preset control strategy according to the temperature interval where the temperature value is located.
The control strategy for the first temperature interval comprises steps S311-S312:
s311, when the temperature value is smaller than a preset over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval.
In this embodiment, when the temperature of the heat sink is < [ over-temperature speed regulation recovery value ], the temperature is determined as a first temperature interval, that is, a temperature green area.
And S312, receiving and executing the vehicle control unit rotating speed instruction.
In this embodiment, when the temperature is in the green temperature range, the over-temperature speed regulation flag is cleared, the protection limitation is exited, the normal control is resumed, and the rotating speed instruction of the vehicle control unit is received and executed.
The control strategy for the second temperature interval comprises steps S321-S323:
s321, when the temperature value is greater than or equal to a preset over-temperature speed regulation threshold value, determining that the temperature value is in the second temperature interval;
in this embodiment, when the temperature of the heat sink is greater than or equal to [ the over-temperature speed regulation threshold ], the temperature is determined to be the second temperature interval, that is, the temperature yellow area.
S322, regulating the rotating speed to a preset speed-limiting target rotating speed;
in this embodiment, after entering this state, the driver adjusts the speed to [ speed-limiting target speed ] regardless of the current speed.
S323, if the temperature value is smaller than the over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval and executing according to a logic strategy corresponding to the first temperature interval.
In this embodiment, when the temperature is less than the over-temperature speed-regulation recovery value, the logic execution is performed according to the temperature green region.
The control strategy for the third temperature interval comprises steps S331-S334:
s331, when the compressor runs, if the temperature value is increased to be greater than or equal to a preset first temperature value and the increased temperature value is greater than or equal to a preset second temperature value within a preset first time, determining that the temperature value is in the third temperature interval;
in this embodiment, when the compressor is running, if the temperature rise of the radiator is greater than or equal to 10 degrees within 30 seconds and the temperature of the radiator after the temperature rise is greater than or equal to 50 degrees, the temperature is determined as a third temperature interval, that is, a temperature orange zone. In the above embodiment, the first time is 30 seconds, the first temperature value is 10 degrees celsius, and the second temperature value is 50 degrees celsius.
S332, controlling the compressor to stop and reporting an over-temperature alarm, adding 1 to the first counter, and recovering starting after a preset minimum stop interval time.
In this embodiment, the system is shut down and an over-temperature alarm is reported, the over-temperature counter is increased by 1, and the system is restarted according to the condition after the time (the minimum shutdown interval) is up.
And S333, when the first counter is equal to a preset first threshold value, locking and carrying out fault alarm, and recovering normal operation through power failure.
In this embodiment, when the counter equals 3, an alarm is issued and the fault is locked, and power is required to be cut off for recovery. In the above embodiment, the first threshold value is 3.
And S334, when the compressor runs, if the temperature value is increased to be smaller than a preset first temperature value or the increased temperature value is smaller than a preset second temperature value within a preset time, the first count is cleared by 0.
In this embodiment, if the condition that the temperature rise is equal to or greater than 10 degrees and the temperature after the temperature rise is equal to or greater than 50 degrees within 30 seconds is not satisfied during the operation of the compressor, the count is clear 0. In the above embodiment, the first time is 30 seconds, the first temperature value is 10 degrees celsius, and the second temperature value is 50 degrees celsius.
The control strategy for the fourth temperature interval comprises steps S341-S346:
s341, if the temperature value is greater than or equal to a preset over-temperature shutdown threshold value, determining that the temperature value is in the fourth temperature interval;
in this embodiment, if the temperature of the compressor radiator is greater than or equal to [ the over-temperature shutdown threshold ], the fourth temperature interval, that is, the temperature red zone, is determined.
S342, controlling the compressor to stop and reporting an over-temperature alarm;
in this embodiment, when the temperature is in the red zone, the machine is stopped and an over-temperature alarm is reported.
S343, if an over-temperature alarm occurs within a preset second time, adding 1 to a second counter;
in this embodiment, during operation, if an over-temperature alarm occurs within 10 minutes, the counter is incremented by 1. In the above example, the second time was 10 minutes.
S344, when the second counter is equal to a preset second threshold value, locking is carried out, and normal operation is recovered through power failure;
in this embodiment, when the count is 2, the lock is locked, and the lock must be powered off to recover. In the above embodiment, the second threshold value is 2.
S345, if the second counter is 1, starting operation for a preset number of times and no over-temperature alarm occurs after the preset third time, clearing 0 by the second counter;
in this embodiment, if the operation is started for the 2 nd time after 1 count, and the temperature is not exceeded in more than 10 minutes, the current counter is cleared by 0. In the above embodiment, the predetermined number of times is 2, and the third time is 10 minutes.
S346, if the temperature value is smaller than a preset over-temperature shutdown recovery value, determining that the temperature value is in the first temperature interval and executing according to a logic strategy corresponding to the first temperature interval.
In this embodiment, if the radiator temperature is less than the value of over-temperature shutdown recovery, the logic execution is performed according to the temperature green region.
Wherein, the meaning and setting of the above-mentioned key preset parameters are according to the following table:
the above temperature refers to the temperature of the heat sink, and the parameters are preset values, which can generally satisfy the application under most conditions, but can also be flexibly adjusted according to the experimental effect of the specific air conditioning system.
Therefore, the temperature of the radiator of the variable frequency driver can be used for dynamic regulation and protection.
The invention provides a temperature protection device of a variable frequency compressor of a new energy automobile.
The dividing module is used for dividing various temperature intervals; the plurality of temperature intervals comprise a first temperature interval, a second temperature interval, a third temperature interval and a fourth temperature interval.
In this embodiment, four different intervals are divided. The first temperature interval can also be called a temperature green area, the second temperature interval can also be called a temperature yellow area, the third temperature interval can also be called a temperature orange area, and the fourth temperature interval can also be called a temperature red area.
The detection module is used for detecting the temperature value of the variable frequency compressor radiator in real time;
in this embodiment, the temperature value of the heat sink is detected in real time by a driver in the compressor.
The execution module is used for executing a preset control strategy according to the temperature interval where the temperature value is located. The execution module comprises a first temperature execution submodule, a second temperature execution submodule, a third temperature execution submodule and a fourth temperature execution submodule.
The first temperature execution submodule is used for determining that the temperature value is in the first temperature interval when the temperature value is smaller than a preset over-temperature speed regulation recovery value; and receiving and executing the rotating speed command of the whole vehicle controller.
In this embodiment, when the temperature of the heat sink is < [ over-temperature speed regulation recovery value ], the temperature is determined as a first temperature interval, that is, a temperature green area. And when the temperature is in the green temperature zone, clearing the over-temperature speed regulation mark, exiting the protection limit, recovering the normal control, and receiving and executing the rotating speed instruction of the whole vehicle controller.
The second temperature execution sub-module is used for determining that the temperature value is in the second temperature interval when the temperature value is greater than or equal to a preset over-temperature speed regulation threshold value; regulating the rotating speed to a preset speed-limiting target rotating speed; and if the temperature value is smaller than the over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval, transferring to a first temperature execution sub-module, and executing according to a logic strategy corresponding to the first temperature interval.
In this embodiment, when the temperature of the heat sink is greater than or equal to [ the over-temperature speed regulation threshold ], the temperature is determined to be the second temperature interval, that is, the temperature yellow area. After entering this state, the driver adjusts the speed to [ speed limit target speed ] regardless of the current speed. When the temperature is less than the over-temperature speed regulation recovery value, the logic execution is carried out according to the temperature green area.
The third temperature execution submodule is used for determining that the temperature value is in a third temperature interval if the temperature value is increased to be greater than or equal to a preset first temperature value and the increased temperature value is greater than or equal to a preset second temperature value within a preset first time when the compressor runs; controlling the compressor to stop and reporting an over-temperature alarm, adding 1 to a first counter, and resuming starting after a preset minimum stop interval; when the first counter is equal to a preset first threshold value, locking and carrying out fault alarm, and restoring normal operation by power failure; when the compressor runs, if the temperature value is increased to be smaller than a preset first temperature value or the increased temperature value is smaller than a preset second temperature value within a preset time, the first count is cleared by 0.
In this embodiment, when the compressor is running, if the temperature rise of the radiator is greater than or equal to 10 degrees within 30 seconds and the temperature of the radiator after the temperature rise is greater than or equal to 50 degrees, the temperature is determined as a third temperature interval, that is, a temperature orange zone. In the above embodiment, the first time is 30 seconds, the first temperature value is 10 degrees celsius, and the second temperature value is 50 degrees celsius. Stopping the machine and reporting an over-temperature alarm, adding 1 to an over-temperature counter, and recovering starting according to conditions after the time of the minimum stopping interval. When the counter equals 3, an alarm is issued and the fault is locked, requiring a power outage for recovery. The first threshold value is 3. If the conditions that the temperature rise is more than or equal to 10 ℃ within 30 seconds and the temperature after the temperature rise is more than or equal to 50 ℃ are not met during the running of the compressor, counting to be 0.
The fourth temperature execution sub-module is used for determining that the temperature value is in the fourth temperature interval when the temperature value is greater than or equal to a preset over-temperature shutdown threshold value; controlling the compressor to stop and reporting an over-temperature alarm; if the over-temperature alarm occurs within the preset second time, the second counter is increased by 1; when the second counter is equal to a preset second threshold value, locking is carried out, and normal operation is recovered through power failure; if the second counter is 1, starting operation for a preset number of times and no over-temperature alarm occurs after the preset third time, and clearing 0 by the second counter; and if the temperature value is smaller than a preset over-temperature shutdown recovery value, determining that the temperature value is in the first temperature interval, transferring to a first temperature execution sub-module, and executing according to a logic strategy corresponding to the first temperature interval.
In this embodiment, if the temperature of the compressor radiator is greater than or equal to [ the over-temperature shutdown threshold ], the fourth temperature interval, that is, the temperature red zone, is determined. When the temperature is in the red zone, the machine is stopped and an over-temperature alarm is reported. In operation, if an over-temperature alarm occurs within 10 minutes, the counter is increased by 1. In the above example, the second time was 10 minutes. When the count is 2, the lock is locked, and the lock can be recovered after power is cut off. In the above embodiment, the second threshold value is 2. If the running is started for the 2 nd time after 1 counting, and the temperature is not exceeded in more than 10 minutes, the current counter is cleared by 0. In the above embodiment, the predetermined number of times is 2, and the third time is 10 minutes. And if the temperature of the radiator is less than the overtemperature shutdown recovery value, performing logic execution according to a temperature green region.
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor. To this end, the embodiment of the present application provides a storage medium, where a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any one of the methods for protecting the temperature of the inverter compressor of the new energy vehicle provided by the embodiment of the present application.
Wherein the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The instructions stored in the storage medium can execute the steps in any one of the temperature protection methods for the variable frequency compressor of the new energy vehicle provided by the embodiments of the present application, so that the beneficial effects that can be realized by any one of the temperature protection methods for the variable frequency compressor of the new energy vehicle provided by the embodiments of the present application can be realized, which are detailed in the foregoing embodiments and are not described herein again. The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A temperature protection method for a variable frequency compressor of a new energy automobile is characterized by comprising the following steps:
dividing various temperature intervals;
detecting the temperature value of the variable-frequency compressor radiator in real time;
and executing a preset control strategy according to the temperature interval where the temperature value is located.
2. The temperature protection method of claim 1, wherein the plurality of temperature intervals comprises a first temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located comprises the following steps:
when the temperature value is smaller than a preset over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval;
and receiving and executing the rotating speed command of the whole vehicle controller.
3. The temperature protection method of claim 2, wherein the plurality of temperature intervals further comprises a second temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located further comprises:
when the temperature value is greater than or equal to a preset over-temperature speed regulation threshold value, determining that the temperature value is in the second temperature interval;
regulating the rotating speed to a preset speed-limiting target rotating speed;
and if the temperature value is smaller than the over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval and executing according to a logic strategy corresponding to the first temperature interval.
4. The temperature protection method according to claim 2 or 3, wherein the plurality of temperature intervals further comprises a third temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located further comprises:
when the compressor runs, if the temperature value is increased to be greater than or equal to a preset first temperature value and the increased temperature value is greater than or equal to a preset second temperature value within a preset first time, determining that the temperature value is in a third temperature interval;
controlling the compressor to stop and reporting an over-temperature alarm, adding 1 to a first counter, and resuming starting after a preset minimum stop interval;
when the first counter is equal to a preset first threshold value, locking and carrying out fault alarm, and restoring normal operation by power failure;
when the compressor runs, if the temperature value is increased to be smaller than a preset first temperature value or the increased temperature value is smaller than a preset second temperature value within a preset time, the first count is cleared by 0.
5. The method of claim 4, wherein the plurality of temperature intervals further comprises a fourth temperature interval; the executing of the preset control strategy according to the temperature interval where the temperature value is located further comprises:
if the temperature value is greater than or equal to a preset over-temperature shutdown threshold value, determining that the temperature value is in the fourth temperature interval;
controlling the compressor to stop and reporting an over-temperature alarm;
if the over-temperature alarm occurs within the preset second time, the second counter is increased by 1;
when the second counter is equal to a preset second threshold value, locking is carried out, and normal operation is recovered through power failure;
if the second counter is 1, starting operation for a preset number of times and no over-temperature alarm occurs after the preset third time, and clearing 0 by the second counter;
and if the temperature value is smaller than a preset over-temperature shutdown recovery value, determining that the temperature value is in the first temperature interval and executing according to a logic strategy corresponding to the first temperature interval.
6. The temperature protection method of claim 5, wherein the over-temperature shutdown threshold value is greater than the over-temperature shutdown recovery value and greater than the over-temperature throttle threshold value and greater than the over-temperature throttle recovery value.
7. The temperature protection device of the variable frequency compressor of the new energy automobile is characterized by comprising a dividing module, a detection module and an execution module;
the dividing module is used for dividing various temperature intervals;
the detection module is used for detecting the temperature value of the variable frequency compressor radiator in real time;
the execution module is used for executing a preset control strategy according to the temperature interval where the temperature value is located.
8. The temperature protection device of claim 7, wherein the plurality of temperature intervals comprises a first temperature interval, a second temperature interval, a third temperature interval, and a fourth temperature interval;
the execution module comprises a first temperature execution submodule, a second temperature execution submodule, a third temperature execution submodule and a fourth temperature execution submodule;
the first temperature execution submodule is used for determining that the temperature value is in the first temperature interval when the temperature value is smaller than a preset over-temperature speed regulation recovery value; receiving and executing a rotating speed instruction of the whole vehicle controller;
the second temperature execution sub-module is used for determining that the temperature value is in the second temperature interval when the temperature value is greater than or equal to a preset over-temperature speed regulation threshold value; regulating the rotating speed to a preset speed-limiting target rotating speed; if the temperature value is smaller than the over-temperature speed regulation recovery value, determining that the temperature value is in the first temperature interval, transferring to a first temperature execution sub-module, and executing according to a logic strategy corresponding to the first temperature interval;
the third temperature execution submodule is used for determining that the temperature value is in a third temperature interval if the temperature value is increased to be greater than or equal to a preset first temperature value and the increased temperature value is greater than or equal to a preset second temperature value within a preset first time when the compressor runs; controlling the compressor to stop and reporting an over-temperature alarm, adding 1 to a first counter, and resuming starting after a preset minimum stop interval; when the first counter is equal to a preset first threshold value, locking and carrying out fault alarm, and restoring normal operation by power failure; when the compressor runs, if the temperature value is increased to be smaller than a preset first temperature value or the increased temperature value is smaller than a preset second temperature value within a preset time, the first count is cleared by 0;
the fourth temperature execution sub-module is used for determining that the temperature value is in the fourth temperature interval when the temperature value is greater than or equal to a preset over-temperature shutdown threshold value; controlling the compressor to stop and reporting an over-temperature alarm; if the over-temperature alarm occurs within the preset second time, the second counter is increased by 1; when the second counter is equal to a preset second threshold value, locking is carried out, and normal operation is recovered through power failure; if the second counter is 1, starting operation for a preset number of times and no over-temperature alarm occurs after the preset third time, and clearing 0 by the second counter; and if the temperature value is smaller than a preset over-temperature shutdown recovery value, determining that the temperature value is in the first temperature interval, transferring to a first temperature execution sub-module, and executing according to a logic strategy corresponding to the first temperature interval.
9. The temperature protection device of claim 8, wherein the over-temperature shutdown threshold is greater than the over-temperature shutdown recovery value and greater than the over-temperature throttle threshold is greater than the over-temperature throttle recovery value.
10. A computer-readable storage medium, wherein the storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor to execute the temperature protection method for the inverter compressor of the new energy automobile according to any one of claims 1 to 6.
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