CN103104962B - Method for detecting four-way valve of air-conditioner - Google Patents

The invention relates to air-conditioner intelligent detection technique, and discloses a method for detecting a four-way valve of an air-conditioner. The method for detecting the four-way valve of the air-conditioner can automatically detect and judge whether the four-way valve is normal or abnormal, and timely displays faults, so that convenience is provided for failure predication and after-sales repair. The method comprises the following steps: judging a work pattern when the air-conditioner is switched on; timing operation time of the air-conditioner when the air-conditioner is operated in a heating or a cooling mode; collecting present working frequency of a compressor when the operation time achieves a preset time threshold value; detecting and calculating a difference value of indoor environment temperature and indoor heat exchanger coil pipe temperature and a difference value of outdoor heat exchanger coil pipe temperature and outer environment temperature according to a specific working mode of the air-conditioner when the present working frequency of the compressor achieves a preset frequency threshold value; and judging the four-way valve is abnormal when setting conditions are met, and carrying out alarm reminding for the failure. The method for detecting the four-way valve of the air-conditioner is suitable for being used for intelligently detecting failure of the four-way valve of the air-conditioner.

A kind of method detecting air-conditioner cross valve exception

Technical field

The present invention relates to air-conditioner intelligent testing technology, specifically, relate to a kind of detection determination methods whether abnormal to air-conditioner cross valve.

Background technology

For air-conditioner cross valve, it is for commutating to cold-producing medium thermal cycle in the duct, thus realizes refrigeration according to the requirement command of user or heat.If air-conditioner cross valve due to the reasons such as cross valve relay fault, drive circuit fault, software fault and cross valve be stuck occur abnormal time, cross valve can be caused normally can not to switch by pattern requirements, thus cause abnormal (as: blowing hot-air during refrigeration of working mode of air-conditioner, blow a cold wind over when heating), the subjective feeling of extreme difference is brought to consumer;

In the prior art, air-conditioner can not carry out oneself to the fault of cross valve exception and detect, therefore, when generally there is this fault, user can only ask after-sale service personnel on-site maintenance with subjective feeling, and after-sale service personnel just can carry out corresponding maintenance after also needing field diagnostic, more time-consuming.

Summary of the invention

Technical problem to be solved by this invention is: propose a kind of method detecting air-conditioner cross valve exception, automatically whether normally carries out detection to cross valve and judges, carry out malfunction coefficient in time, thus provide convenience for breakdown judge and after-sales service.

The present invention solves the problems of the technologies described above adopted technical scheme:

A kind of method detecting air-conditioner cross valve exception, comprise: when air-conditioner start runs, mode of operation is judged, when air-conditioner with heat or refrigeration mode run time, timing is carried out to its running time, when reaching preset time threshold when running, collect and process machine present operating frequency, if compressor present operating frequency reaches predeterminated frequency threshold value, then whether abnormal according to air-conditioner specific works mode decision cross valve: if be heating mode, then by the difference of the difference and outdoor heat exchanger coil temperature and outdoor environment temperature that detect and calculate indoor environment temperature and indoor heat exchanger coil temperature, when satisfied imposing a condition, then judge that cross valve occurs abnormal, alarm is carried out to this fault, if be refrigeration mode, then by the difference of the difference and outdoor environment temperature and outdoor heat exchanger coil temperature that detect and calculate indoor heat exchanger coils temperature and indoor environment temperature, when satisfied imposing a condition, then judge that cross valve occurs abnormal, alarm is carried out to this fault and shuts down.

Further, the method specifically comprises:

A., when air-conditioner start runs, mode of operation is judged, if air-conditioner runs with heating mode, then enters step b, if air-conditioner runs in a chiller mode, then enter step c;

B. to carrying out timing its running time, when reaching 5 minutes when running, collect and process machine present operating frequency, if compressor present operating frequency reaches 35Hz, then whether meet to impose a condition by the difference of the difference and outdoor heat exchanger coil temperature and outdoor environment temperature that detect and calculate indoor environment temperature and indoor heat exchanger coil temperature and judge whether cross valve occurs exception: when indoor environment temperature-indoor heat exchanger coil temperature >=2 DEG C, and during outdoor heat exchanger coil temperature-outdoor environment temperature >=2 DEG C, judge that air-conditioner cross valve occurs abnormal, then alarm carried out to this fault and shut down, process ends,

C. to carrying out timing its running time, when reaching 5 minutes when running, collect and process machine present operating frequency, if compressor present operating frequency arrives 35Hz, then whether meet to impose a condition by the difference of the difference and outdoor environment temperature and outdoor heat exchanger coil temperature that detect and calculate indoor heat exchanger coils temperature and indoor environment temperature and judge whether cross valve occurs exception: when indoor heat exchanger coil temperature-indoor environment temperature >=2 DEG C, and during outdoor environment temperature-outdoor heat exchanger coil temperature >=2 DEG C, judge that air-conditioner cross valve occurs abnormal, then alarm carried out to this fault and shut down, process ends.

Further, described alarm is carried out to this fault, comprise and by man-machine interface, this fault message being shown.

The invention has the beneficial effects as follows: whether extremely Intelligent Measurement judgement is carried out to air-conditioner cross valve; be convenient to the quick position to fault message; be conducive to the efficiency improving after-sales service; and once judge that extremely at once shutting down appears in air-conditioner cross valve, avoid blowing a cold wind over when bringing such as heat to user, the subjective feeling of the difference of blowing hot-air when freezing.

Accompanying drawing explanation

Fig. 1 is the method flow diagram of the detection air-conditioner cross valve exception in the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with drawings and Examples, technical scheme of the present invention is further described.

The invention discloses a kind of method detecting air-conditioner cross valve exception, automatically whether detection is normally carried out to cross valve and judge, carry out malfunction coefficient in time, thus provide convenience for breakdown judge and after-sales service.

Embodiment:

As shown in Figure 1, the method for the detection air-conditioner cross valve exception in this example adopts following steps to realize:

1, during air-conditioner start, judge its mode of operation, the solution of the present invention only pays close attention to heating mode or refrigeration mode, is not suitable for other patterns such as dehumidifying, air-supply;

If 2 air-conditioners detect that it runs with heating mode, then whether abnormal by following condition judgment cross valve:

A. to carrying out timing running time, judge whether running time reaches 5 minutes; B. collect and process machine present operating frequency, judges whether to reach 35Hz; C. detect and calculate the difference of indoor environment temperature and indoor heat exchanger coil temperature, judge whether difference is more than or equal to 2 DEG C; D. the difference of detection and counting chamber external heat exchanger coil temperature and outdoor environment temperature, judges whether difference is more than or equal to 2 DEG C;

When only having above-mentioned 4 conditions to meet, just judge that now air-conditioner cross valve is abnormal simultaneously, have arbitrary condition not meet and all show that now air-conditioner cross valve still normally works;

That is: between only having when running >=5 minutes, and compressor present operating frequency >=35Hz, and indoor environment temperature-indoor heat exchanger coil temperature >=2 DEG C, and during outdoor heat exchanger coil temperature-outdoor environment temperature >=2 DEG C, judge that cross valve is abnormal, then now this fault message is shown (as: failure code of display " cross valve breaks down " or correspondence) at human-computer interaction interface, carry out shutdown to compressor to control simultaneously, blow a cold wind over when avoiding heating, bad experience is brought to user, user can dial after-sale service phone, inform after-sale service personnel failure cause, be convenient to timely on-site maintenance,

If 3 air-conditioners detect that it runs in a chiller mode, then whether abnormal by following condition judgment cross valve:

A. to carrying out timing running time, judge whether running time reaches 5 minutes; B. collect and process machine present operating frequency, judges whether to reach 35Hz; C. detect and calculate the difference of indoor heat exchanger coils temperature and indoor environment temperature, judge whether difference is more than or equal to 2 DEG C; D. detect and calculate the difference of outdoor environment temperature and outdoor heat exchanger coil temperature, judge whether difference is more than or equal to 2 DEG C;

When only having above-mentioned 4 conditions to meet, just judge that now air-conditioner cross valve is abnormal simultaneously, have arbitrary condition not meet and all show that now air-conditioner cross valve still normally works;

That is: between only having when running >=5 minutes, and compressor present operating frequency >=35Hz, and indoor heat exchanger coil temperature-indoor environment temperature >=2 DEG C, and during outdoor environment temperature-outdoor heat exchanger coil temperature >=2 DEG C, judge that cross valve is abnormal, then now this fault message is shown (as: failure code of display " cross valve breaks down " or correspondence) at human-computer interaction interface, carry out shutdown to compressor to control simultaneously, blowing hot-air when avoiding freezing, bad experience is brought to user, user can dial after-sale service phone, inform after-sale service personnel failure cause, be convenient to timely on-site maintenance,

It is to be noted, relevant parameter in the above embodiment of the present invention can adjust according to the actual conditions of air-conditioner, be not limited to the above concrete numerical value enumerated, and the present invention is not only applicable to transducer air conditioning, also be applicable to non-frequency air-conditioner, for the air-conditioner not having the data acquisition hardwares such as outdoor coil pipe used, outdoor temperature sensor, suitably can increase acquisition hardware circuit, utilize the existing processor MCU of air-conditioning, also can realize this detection method.

Therefore; the technical scheme of application claims protection comprises but is not limited only to above-described embodiment; those skilled in the art easily expects some equivalent replacement/amendments according to the above-mentioned description of this invention, and it is all belonging within the protection domain under Spirit Essence of the present invention.