CN112519532B - Heat pump system diagnosis control method and device - Google Patents
Heat pump system diagnosis control method and device Download PDFInfo
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- CN112519532B CN112519532B CN202011393001.9A CN202011393001A CN112519532B CN 112519532 B CN112519532 B CN 112519532B CN 202011393001 A CN202011393001 A CN 202011393001A CN 112519532 B CN112519532 B CN 112519532B
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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
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H1/00585—Means for monitoring, testing or servicing the air-conditioning
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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
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
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Abstract
The invention belongs to the technical field of automobile thermal management, and discloses a method and a device for diagnosing and controlling a heat pump system. The method comprises the following steps: acquiring a current sensor signal of a heat pump system; diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result; when the diagnosis result is abnormal, starting a corresponding preset protection strategy; and controlling a compressor in the heat pump system according to the preset protection strategy. By the mode, the current state of the heat pump air conditioner is acquired and diagnosed, and the corresponding preset protection strategy is started when the abnormity is diagnosed, so that the reliable operation of the compressor is ensured, the protection system is not damaged, the diagnosis is carried out in time, the preset protection strategy is started in time, the comfort level of a user is ensured, and the technical problem of how to ensure the stable and reliable operation of the heat pump system is solved.
Description
Technical Field
The invention relates to the technical field of automobile thermal management, in particular to a method and a device for diagnosing and controlling a heat pump system.
Background
When a common air conditioner applied to an electric automobile is used for heating in winter, the common air conditioner is mainly heated through Positive Temperature Coefficient (PTC), and the electric energy is essentially directly converted into heat energy through a PTC sheet no matter whether the PTC is air-heated or water-heated, the theoretical efficiency is 100%, but the loss exists, and the actual possibility is only 90%. With the development of the heat management technology of the electric vehicle, the heat pump air conditioner becomes an important heat management measure for heating and energy saving of the electric vehicle in winter, and the efficiency of the heat pump air conditioner is 200%. According to the big data in the industry, the average energy consumption of PTC in winter is about 2kw, the average energy consumption of heat pump air conditioner is about 1kw, and the energy is saved by about 50%.
However, as the heat pump system is more complex than a common air conditioner and the working condition of the heat pump system is poor at low temperature, more potential failure modes are generated. The proposal is urgently put forward to ensure the stable and reliable operation of the heat pump system.
The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.
Disclosure of Invention
The invention mainly aims to provide a method and a device for diagnosing and controlling a heat pump system, and aims to solve the technical problem of how to ensure the stable and reliable operation of the heat pump system.
To achieve the above object, the present invention provides a heat pump system diagnosis control method, comprising the steps of:
acquiring a current sensor signal of a heat pump system;
diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy;
and controlling a compressor in the heat pump system according to the preset protection strategy.
Optionally, the current sensor signal comprises a first pressure signal collected by a high pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
when the pressure value corresponding to the first pressure signal is greater than a first preset pressure value or less than a second preset pressure value, obtaining a diagnosis result of pressure abnormality, wherein the first preset pressure value is greater than the second preset pressure value;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for forbidding the starting of the compressor when the diagnosis result is that the pressure is abnormal.
Optionally, the current sensor signal comprises a first temperature signal collected by a high pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a refrigeration mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a first preset temperature value, obtaining a diagnosis result of temperature abnormality;
when the current working mode is a heat pump heating mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a second preset temperature value, obtaining a diagnosis result of temperature abnormality;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is that the temperature is abnormal.
Optionally, the current sensor signal comprises a second pressure signal collected by a low pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a refrigeration mode, if the pressure value corresponding to the second pressure signal is smaller than or equal to a third preset pressure value, obtaining a diagnosis result of pressure abnormity;
when the current working mode is a heat pump heating mode, if the pressure value corresponding to the second pressure signal is smaller than or equal to a fourth preset pressure value, obtaining a diagnosis result of pressure abnormality;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is abnormal pressure.
Optionally, the current sensor signal comprises a second temperature signal collected by a low pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode and an environmental temperature value of the heat pump system;
when the current working mode is a heat pump heating mode, if the difference value between the environment temperature value and the temperature value corresponding to the second temperature signal is greater than a third preset temperature value or the temperature value corresponding to the second temperature signal is less than a fourth preset temperature value, obtaining a diagnosis result of temperature abnormality;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for forbidding the rotation speed of the compressor to increase when the diagnosis result is that the temperature is abnormal.
Optionally, the current sensor signal comprises a first pressure signal collected by a high pressure temperature sensor and a second pressure signal collected by a low pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
determining a pressure ratio from the second pressure signal and the first pressure signal;
when the pressure ratio is larger than a preset pressure ratio, obtaining a diagnosis result of pressure abnormity;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is abnormal pressure.
Optionally, the current sensor signal comprises a second temperature signal collected by a low pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode and an air outlet temperature value of the heat pump system;
when the current working mode is a heat pump heating mode, if the difference value between the air outlet temperature value and the temperature value corresponding to the second temperature signal is greater than a fifth preset temperature value, obtaining a diagnosis result of poor heating;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy of Positive Temperature Coefficient (PTC) heating when the diagnosis result is poor heating.
Optionally, the current sensor signal includes an air outlet temperature value and an in-vehicle and out-vehicle temperature value;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a PTC heating mode or a heat pump and PTC heating mode, if the difference between the air outlet temperature value and the vehicle internal and external temperature values is less than or equal to a sixth preset temperature value, a diagnosis result of heating failure is obtained;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for closing the compressor or the PTC when the diagnosis result is poor heating.
Optionally, the current sensor signal includes an evaporation temperature, an in-vehicle and out-vehicle temperature value, a battery maximum temperature, and a water inlet temperature;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a passenger compartment refrigeration mode or a passenger compartment and battery pack refrigeration mode, if the difference value between the evaporation temperature and the temperature inside and outside the vehicle is smaller than or equal to a preset first temperature difference value, obtaining a diagnosis result of poor refrigeration;
when the current working mode is a battery pack refrigeration mode, if the difference value between the highest battery temperature and the water inlet temperature is smaller than or equal to a preset second temperature difference value, obtaining a diagnosis result of poor refrigeration;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for stopping for preset time when the diagnosis result is poor refrigeration.
In order to achieve the above object, the present invention also provides a heat pump system diagnosis control device including:
the acquisition module is used for acquiring a current sensor signal of the heat pump system;
the diagnosis module is used for diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result;
the starting module is used for starting a corresponding preset protection strategy when the diagnosis result is abnormal;
and the control module is used for controlling a compressor in the heat pump system according to the preset protection strategy.
The method comprises the steps of acquiring a current sensor signal of a heat pump system; diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result; when the diagnosis result is abnormal, starting a corresponding preset protection strategy; and controlling a compressor in the heat pump system according to the preset protection strategy. By the mode, the current state of the heat pump air conditioner is acquired and diagnosed, the corresponding preset protection strategy is started when the abnormity is diagnosed, so that the reliable operation of the compressor is ensured, the protection system is not damaged, the diagnosis is timely carried out, the preset protection strategy is started in time, the comfort level of a user is ensured, when multiple failure modes are fully considered to acquire the current sensor signal, the fault tolerance of the system can be increased, and the technical problem of how to ensure the stable and reliable operation of the heat pump system is solved.
Drawings
Fig. 1 is a schematic structural diagram of a heat pump system diagnostic control apparatus of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a heat pump system diagnostic control method of the present invention;
FIG. 3 is a schematic flow chart of a second embodiment of a heat pump system diagnostic control method of the present invention;
FIG. 4 is a schematic flow chart diagram of a heat pump system diagnostic control method according to a third embodiment of the present invention;
fig. 5 is a block diagram showing the configuration of the first embodiment of the heat pump system diagnosis control apparatus of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a heat pump system diagnostic control device of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the heat pump system diagnostic control apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the heat pump system diagnostic control apparatus and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a heat pump system diagnosis control program may be included in the memory 1005, which is one of the storage media.
In the heat pump system diagnosis control apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the heat pump system diagnosis control apparatus of the present invention may be provided in the heat pump system diagnosis control apparatus which calls the heat pump system diagnosis control program stored in the memory 1005 by the processor 1001 and executes the heat pump system diagnosis control method provided by the embodiment of the present invention.
An embodiment of the present invention provides a method for diagnosing and controlling a heat pump system, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the method for diagnosing and controlling a heat pump system according to the present invention.
In this embodiment, the heat pump system diagnosis control method includes the steps of:
step S10: a current sensor signal of the heat pump system is acquired.
It is understood that the execution subject of the present embodiment is a heat pump system diagnosis control device, which may be a Vehicle Control Unit (VCU) of an electric Vehicle or an additionally provided Micro Control Unit (MCU), and the heat pump system diagnosis control device may include a memory for storing a heat pump system diagnosis control program and data that needs to be saved and called.
It should be noted that the current sensor signal includes a signal collected by a sensor mounted on the vehicle and a status signal of the sensor. The signals collected by the sensor are obtained through the communication between the VCU and the sensor, and may include: a low pressure temperature sensor temperature signal and a pressure signal, a high pressure temperature sensor temperature signal and a pressure signal, an indoor temperature sensor temperature signal, an outdoor temperature sensor temperature signal, an evaporation temperature sensor temperature signal and the like; the determination of the status signal of the sensor by the voltage fed back when the sensor is in communication with the VCU or other control unit may include: the voltage signal fed back by the evaporation temperature sensor, the voltage signal fed back by the indoor temperature sensor, the voltage signal fed back by the outdoor temperature sensor, the voltage signal fed back by the servo motor, the voltage signal fed back by the low-voltage pressure temperature sensor, the voltage signal fed back by the high-voltage pressure temperature sensor, and the like. In a specific implementation, the low-pressure temperature sensor is arranged between the heat pump and the gas-liquid separator, and the high-pressure temperature sensor is arranged between the indoor heat exchanger and the outdoor heat exchanger. In order to make the results of the subsequent diagnosis more accurate, the current sensor signal may be a signal over a period of time.
Step S20: and diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result.
It should be understood that the process of diagnosing the heat pump system according to the current sensor signal may include calling a standard signal in a memory, comparing the current sensor signal with the standard signal, determining whether the current sensor signal is consistent with the standard signal, if not, obtaining an abnormal diagnosis result, and if so, obtaining a normal diagnosis result; the method also can comprise the steps of judging whether the value corresponding to the current sensor signal is smaller than a preset value and lasts for a preset time, if so, obtaining an abnormal diagnosis result, and if not, obtaining a normal diagnosis result.
Step S30: and starting a corresponding preset protection strategy when the diagnosis result is abnormal.
It should be noted that the preset protection strategy mainly aims at the heat pump air conditioning system, for example, when the abnormal condition is a preset major fault, the protection strategy for stopping the operation of the heat pump air conditioning system is started, so as to ensure the safety of the system. The preset protection strategy comprises a compressor control instruction, control time, a feedback response mechanism and the like.
Step S40: and controlling a compressor in the heat pump system according to the preset protection strategy.
It can be understood that the control command, the control time and the feedback response mechanism are determined according to a preset protection strategy, and the compressor is controlled to operate according to the preset protection strategy, so as to ensure the normal operation of the system, for example, the control command is deceleration and the control time is one minute, and the feedback response mechanism is that if the corresponding temperature is still higher than a preset value, the deceleration is continuously controlled until the temperature is lower than another preset value, and the compressor is controlled to operate at the desired rotation speed. The VCU acquires current sensor signals of the heat pump air conditioner every other diagnosis period and diagnoses the current sensor signals, so that the heat pump air conditioner system keeps normal operation, and the diagnosis period is set according to actual conditions.
In a specific implementation, for a heat pump air conditioning system, fault diagnosis of related sensors and actuators is perfected and added, and specific contents may include:
the method comprises the steps of collecting a voltage average value fed back by a circulating servo motor, if the number of times that the voltage average value is smaller than or equal to a preset value reaches a preset number of times and the fault duration time reaches a preset time, judging that the circulating servo motor is likely to have an open circuit fault, specifically, the preset number of times can be set to 20 times, the preset value can be set to 0.1V, and the preset time can be set to 2min. When the VCU detects that the circulating servo motor is likely to have an open circuit fault, the VCU controls the circulating servo motor to drive in the opposite direction, the circulating servo motor moves reversely for 2s for 3 times continuously, if the average voltage value is acquired to be less than or equal to 0.1V and the fault lasts for 2min, the circulating servo motor is judged to have the open circuit fault, the circulating servo motor is stopped to work, and an open circuit fault code of the circulating servo motor is reported;
acquiring the motion condition of a circulating servo motor, if the motion condition does not reach a specified position within 20s, judging that the circulating servo motor possibly breaks down, after the circulating servo motor normally moves for 20s, carrying out 3 times of circulating starting (2 s starting and 2s stopping) by a VCU (video command unit), if the acquired voltage still does not accord with a set voltage range and lasts for 2min, judging that the circulating servo motor breaks down, stopping the action of the circulating servo motor, and reporting a fault code of the circulating servo motor, wherein the error precision is +/-0.2V;
when the voltage fed back by the low-pressure temperature sensor is detected to be less than or equal to 0.1V and lasts for 2min, the short-circuit fault of the low-pressure temperature sensor is judged, the compressor is allowed to be started by adopting the temperature default value of 20 ℃ and the pressure default value of 0.5MPa, and the short-circuit fault code of the low-pressure temperature sensor is reported. When the voltage fed back by the low-pressure temperature sensor is collected to be more than or equal to 4.9V and lasts for 2min, judging that the low-pressure temperature sensor has a circuit breaking fault, allowing the compressor to be started by adopting a temperature default value of 20 ℃ and a pressure default value of 0.5MPa, and reporting a circuit breaking fault code of the low-pressure temperature sensor;
when the voltage fed back by the high-pressure temperature sensor is detected to be less than or equal to 0.1V and lasts for 2min, the high-pressure temperature sensor is judged to be in short circuit, the compressor is allowed to be started by adopting the temperature default value of 20 ℃ and the pressure default value of 1.0MPa, and the short circuit code of the high-pressure temperature sensor is reported. When the voltage fed back by the high-pressure temperature sensor is collected to be more than or equal to 4.9V and lasts for 2min, the high-pressure temperature sensor is judged to be in an open circuit, the compressor is allowed to be started by adopting a temperature default value of 20 ℃ and a pressure default value of 1.0MPa, and the open circuit code of the high-pressure temperature sensor is reported;
when the voltage fed back by the indoor temperature sensor is detected to be more than or equal to 4.9V and lasts for 2min, judging that the temperature sensor at the foot blowing air outlet has an open circuit fault, the temperature sensor at the face blowing air outlet has an open circuit fault and the PTC temperature sensor has an open circuit fault, and adopting a temperature default value of 25 ℃ and disconnecting the PTC relay. And reporting related fault codes. When the voltage fed back by the outdoor temperature sensor is collected to be less than or equal to 0.1V and lasts for 2min, judging that a short-circuit fault of a temperature sensor at a foot blowing air outlet, a short-circuit fault of a temperature sensor at a face blowing air outlet and a short-circuit fault of a PTC temperature sensor, adopting a temperature default value of 25 ℃, disconnecting a PTC relay, and reporting related fault codes;
when the temperature collected by the outdoor temperature sensor is detected to be more than or equal to 5 ℃, the pressure signal collected by the high-pressure temperature sensor is less than 0.2MPa and lasts for 5s, and the return difference is 0.25MPa, the refrigerant is judged to be absent, the compressor is prohibited to be started, and when the pressure signal collected by the high-pressure temperature sensor is more than 0.25MPa and lasts for 5s, the fault is recovered;
when the expansion valve signal can not be received for 2min, determining that the electronic expansion valve signal is lost;
detecting that the suction superheat degree is more than 30 after the compressor continuously operates for 2min, and judging that a refrigerant leaks when the heat pump heats;
and when the single battery is in a cooling state, detecting that the pressure signal acquired by the low-pressure temperature sensor is less than or equal to 0.05Mpa and lasts for 5s, and judging that the battery cooler is in a blockage fault.
Specifically, the current sensor signal comprises a first pressure signal collected by a high-pressure temperature sensor;
step S20, comprising: when the pressure value corresponding to the first pressure signal is greater than a first preset pressure value or less than a second preset pressure value, obtaining a diagnosis result of pressure abnormality, wherein the first preset pressure value is greater than the second preset pressure value;
step S30, comprising: and starting a protection strategy for forbidding the starting of the compressor when the diagnosis result is that the pressure is abnormal.
In specific implementation, the first preset pressure value is 3.06MPa, the second preset pressure value is 0.2MPa, and when the pressure value corresponding to the first pressure signal is greater than 3.06MPa or the pressure value corresponding to the first pressure signal is less than 0.2MPa, the compressor is prohibited to be started; and when the pressure value corresponding to the first pressure signal is between 0.25MPa and 2.86MPa, the compressor is allowed to be started.
When the current working mode of the heat pump system is a refrigeration mode, whether the pressure value corresponding to the first pressure signal is in a return difference interval or not is judged, if the pressure value is in the return difference interval, the compressor is controlled to maintain the working state, the return difference interval is 2.86-3.06 MPa or 0.2-0.25 MPa, when the vehicle is ignited, the pressure value corresponding to the first pressure signal is detected to be in the return difference interval, and at the moment, the compressor is not allowed to work.
Specifically, the current sensor signal comprises a first temperature signal collected by a high-pressure temperature sensor;
step S20, comprising: acquiring a current working mode of the heat pump system; when the current working mode is a refrigeration mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a first preset temperature value, obtaining a diagnosis result of temperature abnormality; when the current working mode is a heat pump heating mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a second preset temperature value, obtaining a diagnosis result of temperature abnormality;
step S30, comprising: and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is that the temperature is abnormal.
In a specific implementation, the first preset temperature value may be set to 126 ℃ and the second preset temperature value may be set to 90 ℃; when in the refrigeration mode, the temperature value corresponding to the first temperature signal is greater than or equal to 126 ℃, a protection strategy for reducing the rotating speed of the compressor is started, and the protection strategy for reducing the rotating speed of the compressor in the refrigeration mode may include: and when the temperature value corresponding to the first temperature signal is detected to be larger than or equal to 126 ℃, controlling the rotating speed of the compressor to decrease by a first gradient, wherein the first gradient is 70% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a second gradient after the compressor is operated for 60s, wherein the second gradient is 50% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a third gradient after the compressor is operated for 60s, wherein the third gradient is 40% of the target rotating speed, obtaining the current first temperature signal collected by the high-pressure temperature sensor again after the rotating speed of the compressor is decreased to the third gradient, controlling the compressor to stop operating if the temperature value corresponding to the current first temperature signal is larger than or equal to 125 ℃ and lasts for 60s, and controlling the rotating speed of the compressor to return to the rotating speed before the decreasing if the temperature value corresponding to the current first temperature signal is smaller than or equal to 124 ℃.
It is understood that in any case of the cooling mode, the VCU detects that the temperature value corresponding to the first temperature signal is greater than or equal to 130 ℃ for 5 seconds, and controls the compressor to stop, and if the rotation speed of the compressor is detected to be between 1200rpm and 1600rpm, that is, 1200rpm is less than or equal to the rotation speed of the compressor <1600rpm, at which time the temperature value corresponding to the first temperature signal is greater than or equal to 105 ℃ for 60 seconds, the compressor is controlled to stop.
It should be noted that, in the heat pump heating mode, the temperature value corresponding to the first temperature signal is greater than or equal to 90 ℃, the protection strategy for reducing the rotation speed of the compressor is started, and the protection strategy for reducing the rotation speed of the compressor in the heat pump heating mode may include: when the temperature value corresponding to the first temperature signal is detected to be more than or equal to 90 ℃, the rotating speed of the compressor is controlled to be reduced by a first gradient, wherein the first gradient is 70% of the target rotating speed, the rotating speed of the compressor is controlled to be reduced to a second gradient after the compressor is operated for 60s, the rotating speed of the compressor is controlled to be reduced to a third gradient after the compressor is operated for 60s, wherein the third gradient is 40% of the target rotating speed, the current first temperature signal acquired by the high-pressure temperature sensor is obtained again after the rotating speed of the compressor is reduced to the third gradient, if the temperature value corresponding to the current first temperature signal is more than or equal to 90 ℃ and lasts for 60s, the compressor is controlled to stop operating, and if the temperature value corresponding to the current first temperature signal is less than or equal to 88 ℃, the rotating speed of the compressor is controlled to return to the rotating speed before the reduction.
It can be understood that in any case of the heat pump heating mode, the VCU detects that the temperature value corresponding to the first temperature signal is greater than or equal to 95 ℃ for 5 seconds, and controls the compressor to stop, and if the rotation speed of the compressor is detected to be between 1600rpm and 2000rpm, that is, 1200rpm is less than or equal to the rotation speed of the compressor <2000rpm, at this time, the temperature value corresponding to the first temperature signal is greater than or equal to 85 ℃ for 60 seconds, and controls the compressor to stop; and if the rotating speed of the compressor is more than or equal to 1200rpm and less than 1600rpm, controlling the compressor to stop when the temperature value corresponding to the first temperature signal is more than or equal to 85 ℃ and lasts for 60 seconds.
Specifically, the current sensor signal comprises a second pressure signal collected by a low-pressure temperature sensor;
step S20, comprising: acquiring a current working mode of the heat pump system; when the current working mode is a refrigeration mode, if the pressure value corresponding to the second pressure signal is smaller than or equal to a third preset pressure value, obtaining a diagnosis result of pressure abnormity; when the current working mode is a heat pump heating mode, if the pressure value corresponding to the second pressure signal is smaller than or equal to a fourth preset pressure value, obtaining a diagnosis result of pressure abnormality;
step S30, comprising: and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is abnormal pressure.
In specific implementation, the third preset pressure value may be set to 0.2MPa, the fourth preset pressure value may be set to 0.12MPa, and when the compressor is in the refrigeration mode, the pressure value corresponding to the second pressure signal is less than or equal to 0.2MPa, the protection strategy for reducing the rotation speed of the compressor is started, and the protection strategy for reducing the rotation speed of the compressor in the refrigeration mode may include: and when the pressure value corresponding to the second pressure signal is detected to be less than or equal to 0.2MPa, controlling the rotating speed of the compressor to decrease to a first gradient, wherein the first gradient is 70% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a second gradient after the compressor operates for 60s, wherein the second gradient is 50% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a third gradient after the compressor operates for 60s, wherein the third gradient is 40% of the target rotating speed, obtaining the current second pressure signal acquired by the low-pressure temperature sensor again after the rotating speed of the compressor decreases to the third gradient, controlling the compressor to stop operating if the pressure value corresponding to the second pressure signal is less than or equal to 0.2MPa and lasts for 60s, and controlling the rotating speed of the compressor to return to the rotating speed before the decreasing if the pressure value corresponding to the second pressure signal increases to 0.22 MPa.
It can be understood that, in the heat pump heating mode, the pressure value corresponding to the second pressure signal is less than or equal to 0.12MP, the protection strategy for reducing the rotation speed of the compressor is started, and the protection strategy for reducing the rotation speed of the compressor in the heat pump heating mode may include: and when the pressure value corresponding to the second pressure signal is detected to be less than or equal to 0.12MP, controlling the rotating speed of the compressor to decrease to a first gradient, wherein the first gradient is 70% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a second gradient after running for 60s, wherein the second gradient is 50% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a third gradient after running for 60s, wherein the third gradient is 40% of the target rotating speed, obtaining the current second pressure signal acquired by the low-pressure temperature sensor again after the rotating speed of the compressor decreases to the third gradient, controlling the compressor to stop running if the pressure value corresponding to the current second pressure signal is less than or equal to 0.12MPa and lasts for 60s, and controlling the rotating speed of the compressor to return to the rotating speed before decreasing if the pressure value corresponding to the current second pressure signal is increased to 0.14 MPa.
Specifically, the current sensor signal comprises a second temperature signal collected by a low-pressure temperature sensor;
step S20, comprising: acquiring a current working mode and an environmental temperature value of the heat pump system; when the current working mode is a heat pump heating mode, if the difference value between the environment temperature value and the temperature value corresponding to the second temperature signal is greater than a third preset temperature value or the temperature value corresponding to the second temperature signal is less than a fourth preset temperature value, obtaining a diagnosis result of temperature abnormality;
step S30, comprising: and starting a protection strategy for forbidding the rotation speed of the compressor to increase when the diagnosis result is that the temperature is abnormal.
It can be understood that the third preset temperature value can be set to 13 ℃, the fourth preset temperature value can be set to-25 ℃, and when the heat pump heating mode is in use, if the difference value between the environment temperature value and the temperature value corresponding to the second temperature signal is greater than 13 ℃ or the temperature value corresponding to the second temperature signal is less than or equal to-25 ℃, the rotation speed of the compressor is prohibited from increasing.
Specifically, the current sensor signal includes a first pressure signal collected by a high-pressure temperature sensor and a second pressure signal collected by a low-pressure temperature sensor;
step S20, comprising: determining a pressure ratio from the second pressure signal and the first pressure signal; when the pressure ratio is larger than a preset pressure ratio, obtaining a diagnosis result of pressure abnormity;
step S30, comprising: and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is abnormal pressure.
It will be appreciated that the preset pressure ratio may be set to 15.5 and that the protection strategy for compressor speed droop may include: and when the pressure ratio is detected to be more than or equal to 15.5, controlling the rotating speed of the compressor to decrease to a first gradient, wherein the first gradient is 70% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a second gradient after 60s of operation, wherein the second gradient is 50% of the target rotating speed, controlling the rotating speed of the compressor to decrease to a third gradient after 60s of operation, wherein the third gradient is 40% of the target rotating speed, acquiring a first pressure signal acquired by a high-pressure temperature sensor and a second pressure signal acquired by a low-pressure temperature sensor again after the rotating speed of the compressor decreases to the third gradient, controlling the compressor to stop operating if the ratio of the first pressure signal to the second pressure signal is more than or equal to 15.5 and lasts for 60s, and controlling the rotating speed of the compressor to return to the rotating speed before the speed decrease if the ratio of the first pressure signal to the second pressure signal is more than or equal to 13.
It will be appreciated that in any event, the VCU detects that the ratio of the first pressure signal to the second pressure signal is ≧ 16.5 for 60 seconds, and controls the compressor to stop, and if the compressor speed is detected at <2000rpm, at which time the ratio of the first pressure signal to the second pressure signal is ≧ 13.5 for 60 seconds, then controls the compressor to stop.
The embodiment obtains the current sensor signal of the heat pump system; diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result; when the diagnosis result is abnormal, starting a corresponding preset protection strategy; and controlling a compressor in the heat pump system according to the preset protection strategy. By the mode, the current state of the heat pump air conditioner is acquired and diagnosed, the corresponding preset protection strategy is started when the abnormity is diagnosed, so that the reliable operation of the compressor is ensured, the protection system is not damaged, the diagnosis is timely carried out, the preset protection strategy is started in time, the comfort level of a user is ensured, when multiple failure modes are fully considered to acquire the current sensor signal, the fault tolerance of the system can be increased, and the technical problem of how to ensure the stable and reliable operation of the heat pump system is solved.
Referring to fig. 3, fig. 3 is a schematic flow chart of a heat pump system diagnostic control method according to a second embodiment of the present invention.
Based on the first embodiment, in the diagnosis control method of the heat pump system according to the present embodiment, the current sensor signal includes a second temperature signal collected by a low-pressure temperature sensor;
step S20, comprising:
step S201: and acquiring the current working mode and the air outlet temperature value of the heat pump system.
It can be understood that, in this embodiment, the current operating mode may include: the air outlet temperature value is determined by a temperature sensor arranged at the air outlet.
Step S202: and when the current working mode is a heat pump heating mode, if the difference value between the air outlet temperature value and the temperature value corresponding to the second temperature signal is greater than a fifth preset temperature value, obtaining a diagnosis result of poor heating.
It should be noted that the fifth preset temperature value may be set to 40 ℃, in a specific implementation, the current working mode is a heat pump heating mode, when the compressor continuously operates for more than 2min, the second temperature signal acquired by the low-pressure temperature sensor and the air outlet temperature value are acquired, and if a difference between the air outlet temperature value and a temperature value corresponding to the second temperature signal is greater than 40 ℃, it may be determined that the heat pump is not well heated under the working condition.
Step S30, comprising:
step S301: and starting a protection strategy of Positive Temperature Coefficient (PTC) heating when the diagnosis result is poor heating.
It should be noted that, when the diagnosis result is that the heating is poor, the fault code 437 is reported, which further includes a fault bit, where 1 represents a fault and 0 represents no fault. A Positive Temperature Coefficient (PTC) heating system responds to a fault sent by the VCU to initiate PTC heating.
When the current operating mode is the PTC heating mode and the heat pump and PTC heating mode, the present embodiment also proposes a preset protection strategy for response, which includes the following specific contents:
the current sensor signal comprises an air outlet temperature value and an in-vehicle and out-vehicle temperature value;
step S20, comprising: acquiring a current working mode of the heat pump system; when the current working mode is a PTC heating mode or a heat pump and PTC heating mode, if the difference between the air outlet temperature value and the vehicle internal and external temperature values is less than or equal to a sixth preset temperature value, a diagnosis result of heating failure is obtained;
step S30, comprising: and starting a protection strategy for closing the compressor or the PTC when the diagnosis result is poor heating.
It can be understood that the sixth preset temperature value may be set to 4 ℃, when the current working mode is the PTC heating mode or the heat pump and PTC heating mode, the current circulation mode needs to be considered, when the circulation mode is the external circulation mode, the compressor or the PTC continuously operates for 2min, and then the air outlet temperature value and the vehicle internal and external temperature values are obtained, whether the difference between the air outlet temperature value and the vehicle external temperature value is less than or equal to 4 ℃ or not is determined, and if the difference is less than or equal to 4 ℃, poor heating is determined. And reporting a fault code 38, controlling the compressor or the PTC to stop, restarting and judging after 3min, stopping again and restarting after waiting for 3min if the difference between the air outlet temperature value and the vehicle outside temperature value is still less than or equal to 4 ℃, carrying out detection for 5 times, and if the fault is not relieved, not carrying out restart detection and always keeping an alarm prompt.
And when the circulation mode is internal circulation, continuously operating the compressor or the PTC for 2min, then obtaining an air outlet temperature value and an in-vehicle and out-vehicle temperature values, determining whether the difference between the air outlet temperature value and the in-vehicle temperature value is less than or equal to 4 ℃, and if the difference is less than or equal to 4 ℃, determining that heating is poor. And reporting a fault code 37, controlling the compressor or the PTC to stop, restarting and judging after 3min, if the difference between the air outlet temperature value and the temperature value in the vehicle is still less than or equal to 4 ℃, stopping again, waiting for 3min, restarting and detecting for 5 times, and if the fault is not removed, not restarting and detecting, and always keeping an alarm prompt.
Whether this embodiment is through having the bad diagnosis of heating to heat pump air conditioner, if for the condition that the heat pump heats alone, then start PTC heating, in time start second set heating system to make heating performance improve, guarantee the reliable operation of compressor, protection system does not receive the damage, and in time diagnosis in time starts and predetermines protection strategy, guarantees user's comfort level, has solved the technical problem who how to ensure the stable and reliable operation of heat pump system.
Referring to fig. 4, fig. 4 is a schematic flow chart of a heat pump system diagnosis control method according to a third embodiment of the present invention.
Based on the first embodiment, in the diagnosis control method of the heat pump system of this embodiment, the current sensor signal includes the evaporation temperature, the temperature inside and outside the vehicle, the maximum battery temperature, and the water inlet temperature;
step S20, comprising:
step S203: and acquiring the current working mode of the heat pump system.
It can be understood that, in this embodiment, the current operating mode may include: a passenger compartment refrigeration mode, a passenger compartment and battery pack refrigeration mode, and a battery pack refrigeration mode.
Step S204: and when the current working mode is a passenger compartment refrigeration mode or a passenger compartment and battery pack refrigeration mode, if the difference value between the evaporation temperature and the temperature inside and outside the vehicle is smaller than or equal to a preset first temperature difference value, obtaining a diagnosis result of poor refrigeration.
It should be noted that the preset first temperature difference is set according to an actual situation, in a specific implementation, in order to make a diagnosis result more accurate and avoid misdiagnosis, the preset first temperature difference is set to be 4 ℃ when the current working mode is a passenger compartment refrigeration mode, and the preset first temperature difference is set to be 3 ℃ when the current working mode is a passenger compartment and battery pack refrigeration mode.
Specifically, when the current working mode is a passenger compartment refrigeration mode, the current circulation mode needs to be considered, and when the current circulation mode is internal circulation, if the difference between the temperature in the vehicle and the evaporation temperature is less than or equal to 4 ℃ and lasts for 2 minutes, poor refrigeration is determined; when the current circulation mode is external circulation, if the difference between the external temperature and the evaporation temperature is less than or equal to 4 ℃ and lasts for 2 minutes, judging that the refrigeration is poor; when the current working mode is a passenger compartment and battery pack refrigeration mode and the current circulation mode is internal circulation, if the difference between the temperature in the vehicle and the evaporation temperature is less than or equal to 3 ℃ and lasts for 2 minutes, determining that the refrigeration is poor; and when the current circulation mode is an external circulation mode, if the difference between the external temperature and the evaporation temperature is less than or equal to 3 ℃ and lasts for 2 minutes, judging that the refrigeration is poor.
Step S205: and when the current working mode is a battery pack refrigeration mode, if the difference between the highest battery temperature and the water inlet temperature is less than or equal to a preset second temperature difference, obtaining a diagnosis result of poor refrigeration.
It will be appreciated that the preset second temperature difference may be set to 2 deg.c, and the VCU sends a fault code 08 when the difference between the detected maximum battery temperature and the inlet temperature is less than or equal to 2 deg.c for 3 minutes.
Step S30, comprising:
step S302: and starting a protection strategy for stopping for preset time when the diagnosis result is poor refrigeration.
It is understood that the protection strategy for the preset time of shutdown may include: and controlling the compressor to stop rotating, responding to the target rotating speed after 3 minutes, clearing the fault, and performing diagnosis again after a preset diagnosis period.
Whether the heat pump air conditioner has poor refrigeration or not is diagnosed by the embodiment, different refrigeration modes are diagnosed respectively, if the condition of poor refrigeration exists, the machine is stopped for the preset time to be started again, the refrigeration efficiency is improved, the reliable operation of the compressor is guaranteed, the protection system is not damaged, the diagnosis is carried out in time, the preset protection strategy is started in time, the comfort level of a user is guaranteed, the fault tolerance of the system is increased, and the technical problem of how to guarantee the stable and reliable operation of the heat pump system is solved.
Referring to fig. 5, fig. 5 is a block diagram showing the configuration of the first embodiment of the diagnosis control apparatus for a heat pump system according to the present invention.
As shown in fig. 5, a heat pump system diagnosis control apparatus according to an embodiment of the present invention includes: .
The acquisition module 10 is used for acquiring a current sensor signal of the heat pump system.
It should be noted that the current sensor signal includes a signal collected by a sensor mounted on the vehicle and a status signal of the sensor. The signals acquired by the sensors are acquired through the communication between the acquisition module 10 and the sensors, and may include: a low pressure temperature sensor temperature signal and a pressure signal, a high pressure temperature sensor temperature signal and a pressure signal, an indoor temperature sensor temperature signal, an outdoor temperature sensor temperature signal, an evaporation temperature sensor temperature signal and the like; the determination of the status signal of the sensor by the voltage fed back when the sensor is in communication with the acquisition module 10 or other control unit may include: the voltage signal fed back by the evaporation temperature sensor, the voltage signal fed back by the indoor temperature sensor, the voltage signal fed back by the outdoor temperature sensor, the voltage signal fed back by the servo motor, the voltage signal fed back by the low-pressure temperature sensor, the voltage signal fed back by the high-pressure temperature sensor and the like. In a specific implementation, the low-pressure temperature and pressure sensor is arranged between the heat pump and the gas-liquid separator, and the high-pressure temperature and pressure sensor is arranged between the indoor heat exchanger and the outdoor heat exchanger. In order to make the results of the subsequent diagnosis more accurate, the current sensor signal may be a signal over a period of time.
The diagnosis module 20 is configured to diagnose the heat pump system according to the current sensor signal to obtain a diagnosis result;
it should be understood that the process of diagnosing the heat pump system according to the current sensor signal may include calling a standard signal in a memory, comparing the current sensor signal with the standard signal, determining whether the current sensor signal is consistent with the standard signal, if not, obtaining an abnormal diagnosis result, and if so, obtaining a normal diagnosis result; the method also can comprise the steps of judging whether the value corresponding to the current sensor signal is smaller than a preset value and lasts for a preset time, if so, obtaining an abnormal diagnosis result, and if not, obtaining a normal diagnosis result.
The starting module 30 is configured to start a corresponding preset protection strategy when the diagnosis result is abnormal;
it should be noted that the preset protection strategy mainly aims at the heat pump air conditioning system, for example, when the abnormal condition is a preset major fault, the protection strategy for stopping the operation of the heat pump air conditioning system is started, so as to ensure the safety of the system. The preset protection strategy comprises a compressor control instruction, control time, a feedback response mechanism and the like.
And the control module 40 is used for controlling the compressor in the heat pump system according to the preset protection strategy.
It can be understood that the control command, the control time and the feedback response mechanism are determined according to a preset protection strategy, and the compressor is controlled to operate according to the preset protection strategy, so as to ensure the normal operation of the system, for example, the control command is deceleration and the control time is one minute, and the feedback response mechanism is that if the corresponding temperature is still higher than a preset value, the deceleration is continuously controlled until the temperature is lower than another preset value, and the compressor is controlled to operate at the desired rotation speed. The obtaining module 10 obtains a current sensor signal of the heat pump air conditioner every other diagnosis period and diagnoses the current sensor signal, so that the heat pump air conditioner system keeps normal operation, and the diagnosis period is set according to actual conditions.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
The embodiment obtains the current sensor signal of the heat pump system; diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result; when the diagnosis result is abnormal, starting a corresponding preset protection strategy; and controlling a compressor in the heat pump system according to the preset protection strategy. By the mode, the current state of the heat pump air conditioner is acquired and diagnosed, the corresponding preset protection strategy is started when the abnormity is diagnosed, so that the reliable operation of the compressor is ensured, the protection system is not damaged, the diagnosis is timely carried out, the preset protection strategy is started in time, the comfort level of a user is ensured, when multiple failure modes are fully considered to acquire the current sensor signal, the fault tolerance of the system can be increased, and the technical problem of how to ensure the stable and reliable operation of the heat pump system is solved.
It should be noted that the above-mentioned work flows are only illustrative and do not limit the scope of the present invention, and in practical applications, those skilled in the art may select some or all of them according to actual needs to implement the purpose of the solution of the present embodiment, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment may be referred to a heat pump system diagnosis control method provided in any embodiment of the present invention, and are not described herein again.
In one embodiment, the current sensor signal comprises a second temperature signal collected by a low pressure temperature sensor;
the diagnosis module 20 is further configured to obtain a current working mode of the heat pump system and an air outlet temperature value;
when the current working mode is a heat pump heating mode, if the difference value between the air outlet temperature value and the temperature value corresponding to the second temperature signal is greater than a fifth preset temperature value, obtaining a diagnosis result of poor heating;
the starting module 30 is further configured to start a protection strategy of Positive Temperature Coefficient (PTC) heating when the diagnosis result is poor heating.
In one embodiment, the current sensor signal includes an air outlet temperature value and an in-vehicle and out-vehicle temperature value;
the diagnosis module 20 is further configured to obtain a current operating mode of the heat pump system;
when the current working mode is a PTC heating mode or a heat pump and PTC heating mode, if the difference between the air outlet temperature value and the vehicle internal and external temperature values is less than or equal to a sixth preset temperature value, a diagnosis result of heating failure is obtained;
the starting module 30 is further configured to start a protection strategy for turning off the compressor or the PTC when the diagnosis result is that the heating is poor.
In one embodiment, the current sensor signal includes an evaporation temperature, an in-vehicle and out-vehicle temperature value, a battery maximum temperature, and a water inlet temperature;
the diagnosis module 20 is further configured to obtain a current operating mode of the heat pump system;
when the current working mode is a passenger compartment refrigeration mode or a passenger compartment and battery pack refrigeration mode, if the difference value between the evaporation temperature and the temperature inside and outside the vehicle is smaller than or equal to a preset first temperature difference value, obtaining a diagnosis result of poor refrigeration;
when the current working mode is a battery pack refrigeration mode, if the difference value between the highest battery temperature and the water inlet temperature is smaller than or equal to a preset second temperature difference value, obtaining a diagnosis result of poor refrigeration;
the starting module 30 is further configured to start a protection strategy for a preset shutdown time when the diagnosis result is poor refrigeration.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A heat pump system diagnostic control method, characterized by comprising:
acquiring a current sensor signal of a heat pump system;
diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy;
controlling a compressor in the heat pump system according to the preset protection strategy;
the current sensor signal comprises a first temperature signal acquired by a high-pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a refrigeration mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a first preset temperature value, obtaining a diagnosis result of temperature abnormality;
when the current working mode is a heat pump heating mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a second preset temperature value, obtaining a diagnosis result of temperature abnormality;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
when the diagnosis result is that the temperature is abnormal, starting a protection strategy for reducing the rotating speed of the compressor;
the current sensor signal comprises a first pressure signal acquired by a high-pressure temperature sensor and a second pressure signal acquired by a low-pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
determining a pressure ratio from the second pressure signal and the first pressure signal;
when the pressure ratio is larger than a preset pressure ratio, obtaining a diagnosis result of pressure abnormity;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is abnormal pressure.
2. The heat pump system diagnostic control method of claim 1, wherein said current sensor signal comprises a first pressure signal collected by a high pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
when the pressure value corresponding to the first pressure signal is greater than a first preset pressure value or less than a second preset pressure value, obtaining a diagnosis result of pressure abnormality, wherein the first preset pressure value is greater than the second preset pressure value;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for forbidding the starting of the compressor when the diagnosis result is that the pressure is abnormal.
3. The heat pump system diagnostic control method of claim 1, wherein said current sensor signal comprises a second pressure signal collected by a low pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a refrigeration mode, if the pressure value corresponding to the second pressure signal is smaller than or equal to a third preset pressure value, obtaining a diagnosis result of pressure abnormity;
when the current working mode is a heat pump heating mode, if the pressure value corresponding to the second pressure signal is smaller than or equal to a fourth preset pressure value, obtaining a diagnosis result of pressure abnormality;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is abnormal pressure.
4. The heat pump system diagnostic control method of claim 1, wherein said current sensor signal comprises a second temperature signal collected by a low pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode and an environmental temperature value of the heat pump system;
when the current working mode is a heat pump heating mode, if the difference value between the environment temperature value and the temperature value corresponding to the second temperature signal is greater than a third preset temperature value or the temperature value corresponding to the second temperature signal is less than a fourth preset temperature value, obtaining a diagnosis result of temperature abnormality;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for forbidding the rotation speed of the compressor to increase when the diagnosis result is that the temperature is abnormal.
5. The heat pump system diagnostic control method of claim 1, wherein said current sensor signal comprises a second temperature signal collected by a low pressure temperature sensor;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode and an air outlet temperature value of the heat pump system;
when the current working mode is a heat pump heating mode, if the difference value between the air outlet temperature value and the temperature value corresponding to the second temperature signal is greater than a fifth preset temperature value, obtaining a diagnosis result of poor heating;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy of Positive Temperature Coefficient (PTC) heating when the diagnosis result is poor heating.
6. The heat pump system diagnostic control method of claim 1, wherein said current sensor signal comprises an outlet temperature value and an in-vehicle and out-of-vehicle temperature value;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a PTC heating mode or a heat pump and PTC heating mode, if the difference between the air outlet temperature value and the vehicle internal and external temperature values is less than or equal to a sixth preset temperature value, a diagnosis result of heating failure is obtained;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for closing the compressor or the PTC when the diagnosis result is poor heating.
7. The heat pump system diagnostic control method of claim 1, wherein said current sensor signal comprises an evaporation temperature, an in-vehicle and out-of-vehicle temperature value, a battery maximum temperature, and a water inlet temperature;
the diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result comprises the following steps:
acquiring a current working mode of the heat pump system;
when the current working mode is a passenger compartment refrigeration mode or a passenger compartment and battery pack refrigeration mode, if the difference value between the evaporation temperature and the temperature inside and outside the vehicle is smaller than or equal to a preset first temperature difference value, obtaining a diagnosis result of poor refrigeration;
when the current working mode is a battery pack refrigeration mode, if the difference value between the highest battery temperature and the water inlet temperature is smaller than or equal to a preset second temperature difference value, obtaining a diagnosis result of poor refrigeration;
when the diagnosis result is abnormal, starting a corresponding preset protection strategy, which comprises the following steps:
and starting a protection strategy for stopping for preset time when the diagnosis result is poor refrigeration.
8. A heat pump system diagnosis control apparatus characterized by comprising:
the acquisition module is used for acquiring a current sensor signal of the heat pump system;
the diagnosis module is used for diagnosing the heat pump system according to the current sensor signal to obtain a diagnosis result;
the starting module is used for starting a corresponding preset protection strategy when the diagnosis result is abnormal;
the control module is used for controlling a compressor in the heat pump system according to the preset protection strategy;
the current sensor signal comprises a first temperature signal acquired by a high-pressure temperature sensor;
the diagnosis module is also used for acquiring the current working mode of the heat pump system; when the current working mode is a refrigeration mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a first preset temperature value, obtaining a diagnosis result of temperature abnormality; when the current working mode is a heat pump heating mode, if the temperature value corresponding to the first temperature signal is greater than or equal to a second preset temperature value, obtaining a diagnosis result of temperature abnormality;
the starting module is also used for starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is that the temperature is abnormal;
the current sensor signal comprises a first pressure signal acquired by a high-pressure temperature sensor and a second pressure signal acquired by a low-pressure temperature sensor;
the diagnostic module is further configured to determine a pressure ratio based on the second pressure signal and the first pressure signal; when the pressure ratio is larger than a preset pressure ratio, obtaining a diagnosis result of pressure abnormity;
the starting module is further used for starting a protection strategy for reducing the rotating speed of the compressor when the diagnosis result is that the pressure is abnormal.
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| JPH09236332A (en) * | 1996-02-29 | 1997-09-09 | Sanyo Electric Co Ltd | Heat pump apparatus for air conditioning |
| CN103486692B (en) * | 2013-09-17 | 2015-10-28 | 青岛海信日立空调系统有限公司 | The method of load self-adapting variable-frequency multi-connection type heat pump and control compressor frequency |
| CN104566863A (en) * | 2014-12-30 | 2015-04-29 | 海信科龙电器股份有限公司 | Method for detecting refrigerant leakage and air conditioner |
| CN105987548B (en) * | 2015-02-03 | 2019-06-07 | Tcl空调器(中山)有限公司 | Refrigeration system method for detecting operation state and device |
| CN107102662A (en) * | 2017-06-20 | 2017-08-29 | 佛山职业技术学院 | A kind of air conditioning for automobiles flow and System Controlled by Measuring Pressure based on WiFi technology |
| CN108583212B (en) * | 2018-07-04 | 2024-04-23 | 泰铂（上海）环保科技股份有限公司 | New energy automobile heat pump air conditioner components of a whole that can function independently control system |
| CN209365821U (en) * | 2018-12-26 | 2019-09-10 | 郑州科林车用空调有限公司 | A kind of single system changes in temperature pure electric vehicle air-conditioning using R410a refrigerant |
| CN109737559B (en) * | 2018-12-29 | 2020-11-27 | 合肥美的暖通设备有限公司 | Air source heat pump, air conditioner, defrosting control method and storage medium |
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