KR20200094282A - Maintenance apparatus refrigerant injection method forairconditioner of a car - Google Patents

Abstract

According to the present invention, the air conditioner maintenance apparatus of the automobile comprises: a low-pressure sensor; a high-pressure sensor; a temperature sensor; and a controller. The low-pressure sensor and the high-pressure sensor are connected to a low-pressure line and a high-pressure line, detect a pressure of a refrigerant, and generate a low pressure for the detection value and a low-pressure detection signal. The temperature sensor is connected to the low-pressure line, detects a surface temperature of the low-pressure line, and generates a temperature detection signal for the detection value. The controller stores in advance the data on the cause, determination, and countermeasures in accordance with the pressure and temperature detected when the air conditioner of the automobile is checked, receive an input of the low-pressure detection signal, high-pressure detection signal, and temperature detection signal generated from the low-pressure sensor, the high-pressure sensor, and the temperature sensor, and display the relevant countermeasures through a display. In addition, the method of injecting a refrigerant into the air conditioner of the automobile, which uses the air conditioner maintenance apparatus of the automobile comprising a manifold block, low-pressure sensor, high-pressure sensor, temperature sensor, and controller, when the refrigerant is started to be injected into the air conditioner of the automobile through the manifold block and when the surface temperature of the low-pressure line of the air conditioner of the automobile detected through the temperature sensor decreases, sets the value as the reference temperature, and when the surface temperature of the low-pressure line detected through the temperature sensor increases to be higher than the reference temperature, recovers the refrigerant of the air conditioner of the automobile, and when the surface temperature of the low-pressure line detected through the temperature sensor becomes the reference temperature, stops the recovery of the refrigerant.

Description

Efficient air conditioner maintenance system and refrigerant injection method in automobiles{MAINTENANCE APPARATUS REFRIGERANT INJECTION METHOD FORAIRCONDITIONER OF A CAR}

The present invention relates to a vehicle air conditioner maintenance device and a method of injecting refrigerant, and more specifically, to automatically check the problems of the air conditioner during maintenance of the car air conditioner to inform the inspector to check the parts of the air conditioner, etc. It relates to a vehicle air conditioner maintenance device and a refrigerant injection method to automatically replenish or complete charging.

Automotive air conditioners perform cooling and dehumidifying functions by repeating the process of compressing, condensing, expanding, and evaporating refrigerants such as Freon gas. As shown in FIG. 1, the automobile air conditioner 1 absorbs indoor heat, so that the refrigerant becomes a low-temperature low-pressure gas evaporator 2;

evaporator, a compressor (4) that absorbs heat from the evaporator (2) and sucks the refrigerant that has become a gas, compresses it into a high-temperature, high-pressure gas that is easily condensed at room temperature, and circulates the refrigerant (4). The condenser (6; condenser) that cools and converts the high-temperature, high-pressure gaseous refrigerant from the liquid to a liquid state, and a receiver drier (7; receiver drier) that filters out moisture and other impurities contained in the refrigerant. An expansion valve (8), which is a pressure reducing device that adjusts appropriately to the load and converts a high-temperature, high-pressure liquid refrigerant into low and low pressure by throttling, and connects these main parts to form a closed circuit in which the refrigerant is circulated. It consists of a refrigerant circulation line. At this time, by connecting the evaporator 2 and the compressor 4 in the refrigerant circulation line, the refrigerant circulation line in the portion where the refrigerant flows as a low-temperature low-pressure gas is called a low-pressure line 3, and the compressor 4 and a condenser 6 are connected. Therefore, the refrigerant circulation line in the portion flowing with the high temperature and high pressure gas is called the high pressure line (5).

Maintenance of automobile air conditioners such as refrigerant leakage when refrigerant is insufficient, breakage of refrigerant circulation line, breakage or wear of the seam between the refrigerant circulation line and each component, and replacement of refrigerant after inspection of normality of each component Or a full charge must be made. That is, maintenance items performed when the car air conditioner does not function properly (the cooling effect is inferior) include refrigerant leakage (leakage) and diagnosis of the presence or absence of each component, replenishment of refrigerant, and full charge. At this time, the replenishment and complete recharging of the refrigerant should be performed after checking for vacuum leakage and the normality of each component.

However, in general, maintenance of automobile air conditioners is performed simply by the inspector manually replenishing refrigerant when the refrigerant is insufficient, and for refrigerant leakage occurring in the refrigerant circulation line, each part, and their connecting parts, and the normal presence or absence of each part. The reality is that it only relies on the technical sense of the inspector. In addition, when a refrigerant is added to an automobile air conditioner (including replenishment and full charge), the inspector usually completes the operation by putting it in a sense or charging the refrigerant based on the prescribed weight of the refrigerant provided by the automobile manufacturer, etc. Since the condition of is not considered, there is a limit to stably maintaining the cooling effect.

Therefore, the present invention has been proposed to improve such a conventional problem, and even an inexperienced inspector can accurately and easily know matters to be repaired for matters to be troubled during maintenance of an automobile air conditioner, and supplement refrigerant or The present invention is to provide a new type of automobile air conditioner maintenance device and a refrigerant injection method capable of automatically performing a full charge.

According to the features of the present invention for achieving the above object, the present invention comprises an evaporator, a compressor, a condenser, a receiver dryer and an expansion valve, and a low pressure line connected by connecting the evaporator and the compressor, and connecting the compressor and the condenser Provided is an automobile air conditioner maintenance device for maintenance of an automobile air conditioner composed of a refrigerant circulation line having a high pressure line connected to each other. Such a car air conditioner maintenance device is connected to the low pressure line and detects a pressure of a refrigerant, and a low pressure sensor for generating a low pressure detection signal for the detected value; A high pressure sensor connected to the high pressure line to detect the pressure of the refrigerant and generate a high pressure detection signal for the detected value; A temperature detection sensor connected to the low pressure line to detect a surface temperature of the low pressure line and generate a temperature detection signal for the detected value; Data for causes, judgments and countermeasures according to the pressure and temperature detected during the inspection of the automobile air conditioner are stored in advance, and the low pressure detection signal, the high pressure detection signal and the temperature detection signal generated from the low pressure sensor, the high pressure sensor and the temperature detection sensor It includes a controller that receives the input so that the corresponding countermeasure is displayed on the display.

According to the vehicle air conditioner maintenance apparatus according to the present invention, since the determination of whether a leak of a refrigerant is not dependent on the sense of the inspector and is automatically determined by comparing the measured data with the data previously input to the controller, measures against vacuum leakage are accurately made. . Also sleeping

Even if you are not an expert in automobile air conditioner by diagnosis of car air conditioner, it is possible to diagnose and repair malfunction, accurately diagnose the vacuum leak of the car air conditioner, and make it possible to supplement or fully charge, so that effective use of refrigerant is possible. In addition, since the number of rework can be reduced through more accurate diagnosis, repair time can be reduced and unnecessary refrigerant discharge can be reduced.

1 is a view for explaining the main components of a car air conditioner;
2 is a view for explaining a car air conditioner maintenance apparatus according to a preferred embodiment of the present invention;
3 is a view for explaining a state in which a low pressure sensor, a high pressure sensor, and a temperature detection sensor in an automobile air conditioner maintenance apparatus according to a preferred embodiment of the present invention are connected;
4 is a view for explaining a form of servicing an automobile air conditioner using an automobile air conditioner maintenance apparatus according to a preferred embodiment of the present invention;
5 is a view for explaining data stored in advance in the controller of the car air conditioner maintenance apparatus according to a preferred embodiment of the present invention;
6 is a view for explaining a method of adjusting the injection amount of refrigerant based on the surface temperature of the low pressure line when injecting refrigerant into the automobile air conditioner using the automobile air conditioner maintenance apparatus according to the preferred embodiment of the present invention.

The vehicle air conditioner maintenance apparatus of the present invention includes a manifold block in which the low pressure sensor and the high pressure sensor are respectively connected to both sides in a preferred embodiment; Further connected to the controller is further provided with a keyboard for selecting and input maintenance items of the car air conditioner, the manifold block is a low pressure solenoid to connect and cut off the connection with the low pressure line on one side to which the low pressure sensor is connected. Is installed, a high pressure solenoid is installed on the other side to which the high pressure sensor is connected to connect and cut off the connection with the high pressure line, and is connected to an air conditioning refrigerant supplementation tank between the low pressure solenoid and the high pressure solenoid, and the controller is vacuumed. Leakage and parts diagnosis, replenishment of refrigerant, maintenance items of the car air conditioner, which are distinguished as full charge of refrigerant, can be input in advance.

have.

The automobile air conditioner maintenance apparatus of the present invention is connected to a vehicle in which the automobile air conditioner is installed in the preferred embodiment, detects the engine speed of the vehicle, generates an engine rotation detection signal for the detected value, and inputs it to the controller It may further include an engine speed detection sensor to make.

According to another feature of the present invention for achieving the above object, the present invention provides a vehicle air conditioner refrigerant injection method using a car air conditioner maintenance device comprising a manifold block, a low pressure sensor, a high pressure sensor, a temperature detection sensor, and a controller. do. A method of injecting refrigerant into an automobile air conditioner includes starting injecting refrigerant into an automobile air conditioner through the manifold block; Setting the value as a reference temperature when the surface temperature of the low pressure line of the automobile air conditioner detected by the temperature detection sensor decreases while the injection of the refrigerant continues; When the surface temperature of the low pressure line detected through the temperature detection sensor is higher than the reference temperature while the injection of the refrigerant is continuously performed, the injection of the refrigerant is stopped and the manifold block is used.

Recovering the refrigerant of the car air conditioner; And stopping the recovery of the refrigerant when the surface temperature of the low pressure line detected through the temperature detection sensor reaches the reference temperature while the refrigerant is continuously recovered.

The automobile air conditioner maintenance apparatus according to the present invention basically includes a low pressure sensor, a high pressure sensor, a temperature detection sensor, and a controller, and includes an evaporator, a compressor, a condenser, a receiver dryer and an expansion valve, and a low pressure connected by connecting the evaporator and the compressor. Maintain a car air conditioner composed of a refrigerant circulation line having a high pressure line connected by connecting a line, a compressor and a condenser.

At this time, the low pressure sensor is connected to the low pressure line to detect the pressure of the refrigerant, and generates a low pressure detection signal for the detected value. The high pressure sensor is connected to the high pressure line to detect the pressure of the refrigerant, and generates a high pressure detection signal for the detected value. The temperature detection sensor is connected to the low pressure line to detect the surface temperature of the low pressure line, and generates a temperature detection signal for the detected value. The controller stores pre-stored data on causes, judgments and countermeasures according to the pressure and temperature detected during inspection of the car air conditioner, and detects low pressure, high pressure and temperature signals generated from the low pressure sensor, high pressure sensor and temperature detection sensor. It is inputted so that the corresponding countermeasure is displayed on the display. Of course, as shown in the preferred embodiment of the present invention to be described later, the diagnosis of the car air conditioner using the maintenance device according to the present invention uses the engine speed detection sensor 44 to maintain the engine at an appropriate speed (usually 1500 rpm-2000 rpm). It can be made while doing so to make an accurate diagnosis.

The automobile air conditioner maintenance apparatus according to the present invention having such a configuration stores the basic data for maintenance of the car air conditioner in advance in the controller, measures the refrigerant pressure on the low pressure line and the high pressure line, and measures the temperature on the low pressure line to measure the temperature on the low pressure line. By comparing each value of the data with the measured value, it is possible to effectively detect the vacuum leakage and the problem of each component in the components constituting the automobile air conditioner, and make it possible to effectively supplement or completely fill the refrigerant. Of course, by adding a manifold block, a keyboard, and an engine speed detection sensor as in the preferred embodiment of the present invention to be described later, it is possible to automatically perform not only the diagnosis of vacuum leakage, but also the replenishment and complete charging of the refrigerant, It is possible to check the engine speed for effective operation. Here, the replenishment of the refrigerant refers to the addition of the refrigerant by an insufficient amount. Full charge refers to the complete discharge of the refrigerant from the vehicle air conditioner from the refrigerant circulation line (recovery) and then the introduction of new refrigerant (generally, when a vacuum leak is confirmed, full charge is performed). In addition, the refrigerant referred to in the present invention refers to a gaseous refrigerant, but when applying a liquid refrigerant when using the automobile air conditioner maintenance apparatus according to the present invention, there will be no difference other than a method of handling the refrigerant (generally, refrigerant) When filling, liquid refrigerant may be injected to speed up the filling operation.

On the other hand, the present invention provides a vehicle air conditioner refrigerant injection method to automatically inject refrigerant (replenishment or full charge) into the vehicle air conditioner and to inject the refrigerant in accordance with the conditions of the components constituting the vehicle air conditioner. In this method, a manifold block (a low-pressure solenoid and a high-pressure solenoid are installed), a low-pressure sensor, a high-pressure sensor, a temperature detection sensor, and a controller equipped with a car air conditioner maintenance device are used. How to inject refrigerant into the car air conditioner

Set the value as the reference temperature when the surface temperature of the low-pressure line of the automobile air conditioner detected through the temperature detection sensor is maintained without change any more while the refrigerant is continuously injected after starting to inject the refrigerant into the car air conditioner. . In addition, the surface temperature of the low-pressure line detected by the temperature detection sensor becomes higher than the reference temperature while the refrigerant is continuously injected.

When the injection of the refrigerant is stopped, the refrigerant of the automobile air conditioner is recovered through the manifold block, and the recovery of the refrigerant is stopped when the surface temperature of the low pressure line detected through the temperature detection sensor reaches the reference temperature.

As described above, the vehicle air conditioner maintenance apparatus according to the present invention does not depend on the inspector's senses, and is automatically determined by comparing the data inputted to the controller with the measured values, so that measures for problems of the vehicle air conditioner are accurately performed. So on the car

Even if you are not an expert about air conditioner, it is possible to diagnose and repair malfunctions, and it is possible to effectively use the refrigerant because it can accurately diagnose and replenish the car air conditioner so that it can be supplemented or fully charged. In addition, since the number of rework can be reduced through more accurate diagnosis, repair time can be reduced and unnecessary refrigerant discharge can be reduced.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 2 to 6 of the accompanying drawings, and the same reference numerals are used for components that perform the same functions in FIGS. 1 to 6. On the other hand, in each drawing, a general automobile air conditioner and maintenance methods and conditions that can be easily seen from the maintenance device thereof, and illustrated and detailed descriptions of technical contents such as a refrigerant circulation line through which the main components are connected so that the refrigerant flows Since it is a part that can be easily understood by those skilled in the art, it is briefly omitted or omitted, and the parts related to the present invention are mainly shown.

Figure 2 is a view for explaining a car air conditioner maintenance device according to a preferred embodiment of the present invention, Figure 3 is a low pressure sensor, a high pressure sensor and a temperature detection sensor of the car air conditioner maintenance device according to a preferred embodiment of the present invention is connected 4 is a view for explaining a state, and FIG. 4 is a view for explaining a form of repairing a car air conditioner using a car air conditioner maintenance device according to a preferred embodiment of the present invention, and FIG. 5 is a view according to a preferred embodiment of the present invention It is a diagram for explaining data stored in advance in a controller of an automobile air conditioner maintenance apparatus, and FIG. 6 is a surface temperature of a low pressure line when injecting refrigerant into an automobile air conditioner using an automobile air conditioner maintenance apparatus according to a preferred embodiment of the present invention It is a view for explaining a method of adjusting the injection amount of the refrigerant on the basis of.

2 and 3, the car air conditioner maintenance apparatus 10 according to a preferred embodiment of the present invention includes a frame 20, a manifold block 30, a low pressure solenoid 34, and a high pressure solenoid 36 , Low pressure sensor 38, high pressure sensor 40, temperature detection sensor 42, engine speed detection sensor 44, display 46, keyboard 48, controller 50, and the like. Here, the low pressure sensor 38 is connected to the low pressure line 3 of the automobile air conditioner to detect the pressure of the refrigerant, and generates a low pressure detection signal for the detected value and inputs it to the controller 50. The high pressure sensor 40 is connected to the high pressure line 5 to detect the pressure of the refrigerant, and generates a high pressure detection signal for the detected value to control

Enter (50). The temperature detection sensor 42 is connected to the low pressure line 3 to detect the surface temperature of the low pressure line 3, and generates a temperature detection signal for the detected value and inputs it to the controller 50. Then, the engine speed detection sensor 44 is connected to the engine ignition line 9 of an automobile in which an automobile air conditioner is installed, detects the engine speed of the vehicle, generates an engine rotation detection signal for the detected value, and controls the controller 50 ).

The vehicle air conditioner maintenance apparatus 10 according to the preferred embodiment of the present invention uses a high pressure sensor 40 and a low pressure sensor 38 made of an electronic sensor, without relying on the senses of an inspector, in order to maintain a vehicle air conditioner. The manifold block 30 is installed to automatically determine the problems of the car air conditioner and to install the temperature detection sensors 42, low pressure and high pressure sensors 38, 40, and low pressure and high pressure solenoids 34 and 36 when refrigerant is injected. It is possible to automatically inject the refrigerant by determining the proper charging state by using.

The frame 20 is a case for fixing each element constituting the automobile air conditioner maintenance device 10, and is formed of metal, plastic, or the like to protect each element installed therein. Of course, in this frame 20, components connected to the measurement part, such as the temperature detection sensor 42 and the engine speed detection sensor 44, are installed in a line form extending from the frame 20, and the manifold block 30 A line extending from) to each valve (not shown) of the low pressure line 3 and the high pressure line 5 is installed, and a coupling structure in which the air conditioning refrigerant replenishment tank 100 is connected will be formed.

As shown in FIG. 5, the controller 50 stores data on causes, judgments, and countermeasures according to pressure and temperature detected during inspection of the automobile air conditioner. The controller 50 includes a low pressure detection signal, a high pressure detection signal, a temperature detection signal and an engine generated from the low pressure sensor 38, the high pressure sensor 40, the temperature detection sensor 42, and the engine speed detection sensor 44. By receiving the rotation speed detection signal, the countermeasures (detection pressure, detection temperature, cause, and judgment may be displayed) are displayed on the display. Like this

The silver controller 50 stores the designated data, and receives the signals generated from the low pressure sensor 38, the high pressure sensor 40, the temperature detection sensor 42, and the engine speed detection sensor 44, and has already stored data. By comparing with and judging, one or more microcomputers (not shown) for displaying the resultant values on the display 46 are installed, and will consist of a circuit board electrically connected to each sensor. Here, an LCD or the like capable of displaying text information or image information may be applied to the display 46.

Meanwhile, the car air conditioner maintenance apparatus 10 according to the preferred embodiment of the present invention is provided with a keyboard 48 connected to the controller 50. This keyboard 48 is used by the inspector to select a maintenance item of the automobile air conditioner so that the automobile air conditioner maintenance device 10 performs a specific maintenance work. That is, the maintenance work of the automobile air conditioner may include diagnosis, replenishment of refrigerant, and full refrigeration of refrigerant. Therefore, in the controller 50, maintenance items of the car air conditioner, which are distinguished by diagnosis, replenishment of refrigerant, and full charge of refrigerant, are input in advance, and maintenance is selectively performed by allowing the inspector to input desired maintenance items through the keyboard 48. Is to do. Of course, such a keyboard 48 may be grafted with a touch screen applied in combination with the above-described display 46.

The manifold block 30 is configured to ensure that the low pressure sensor 28 and the high pressure sensor 40 are installed in the frame 20, and that replenishment and full filling of the refrigerant is automatically performed. On both sides of the manifold block 30, a low pressure solenoid 34 and a high pressure solenoid 36 are installed to face each other. And the low pressure solenoid (34) side is connected to the low pressure line (3) of the car air conditioner, the high pressure solenoid (36) side is connected to the high pressure line (5) of the car air conditioner, each solenoid (34, 36) is a line (3, 5) ) To flow or block the refrigerant flowing in. And the low pressure sensor 38 is connected to the low pressure solenoid 34 side, and the high pressure sensor 40 is connected to the high pressure solenoid 36 side. Also, in the middle of the manifold block 30, that is, the middle portion of the manifold block 30 closed or opened by the low pressure solenoid 34 and the high pressure solenoid 36, an air conditioning refrigerant replenishment tank 100 is connected to replenish the refrigerant. Alternatively, it is possible to supply refrigerant when fully charged.

The configuration of such a manifold block 30 allows the automobile air conditioner maintenance device 10 according to the present invention to automatically perform replenishment of refrigerant and full charge. That is, the automobile air conditioner maintenance apparatus 10 according to the present invention basically includes a low pressure sensor 38, a high pressure sensor 40, a temperature detection sensor 42, a controller 50, and the like, as shown in FIG. According to the data stored in the controller 50, the corresponding item is displayed through the display 46 so that the inspector can easily check the leaks of vacuum and the inspection items of the component parts. Here, the data stored in the controller 50 is the cause, judgment, and countermeasure corresponding to the detected pressure and the detected temperature, and the content displayed on the display 46 is necessary for the detected pressure and temperature, the cause, the judgment, the countermeasure, etc. Will be able to be displayed. In addition to the above configuration, the above-described configuration of the manifold block 30, the low pressure solenoid 34, and the high pressure solenoid 36 is applied together, and the refrigerant together with the diagnosis for the leakage of vacuum and inspection of component parts together with the above-described configuration The maintenance items of replenishment and full charging should be carried out.

Meanwhile, the engine speed detection sensor 44 according to the preferred embodiment of the present invention is further provided. The engine speed detection sensor 44 is configured to detect the engine speed of the vehicle in the form of an engine ignition line 9 of a gasoline vehicle or a fuel line (not shown) of a diesel vehicle, or other forms in which an automobile air conditioner is installed. It is connected to detects the engine speed of the vehicle, generates an engine rotation detection signal for the detected value and inputs it to the controller 50. The engine revolution detection sensor 44 allows the engine revolution speed (rpm) to be checked first when the automobile air conditioner is repaired using the automobile air conditioner maintenance apparatus 10 according to the preferred embodiment of the present invention. It is possible to diagnose the air conditioner at the proper engine speed for operation. That is, by using the automobile air conditioner maintenance apparatus 10 according to the preferred embodiment of the present invention, it is possible to make a more accurate diagnosis by maintaining the proper engine speed when diagnosing the air conditioner, and to maintain the maximum cooling state when charging. . Therefore, in a preferred embodiment of the present invention

The controller 50 of the vehicle air conditioner maintenance device 10 according to the engine speed input from the engine speed detection sensor 44 and the pre-entered reference speed (generally 1500rpm-2000rpm, may be set differently depending on the vehicle model) ), the diagnosis may be started when the engine speed is within the reference, otherwise, the display 52 may indicate that the engine speed is not the reference speed.

On the other hand, as shown in Figure 5, the vehicle air conditioner maintenance apparatus 10 according to a preferred embodiment of the present invention, the necessary data is pre-input in the controller 50 according to maintenance items required for maintenance of the car air conditioner. Such data is set so that causes, judgments and countermeasures are countered based on the detection pressure (low pressure and high pressure) and detection temperature when checking for vacuum leakage. Each item may be configured by referring to the maintenance standard data of the car air conditioner, which is already provided in various ways by automobile companies and the like. For example, if the air conditioner check contents for a specific vehicle are different, the air conditioner check contents for the vehicle may be added to the controller 50 according to a preferred embodiment of the present invention.

Referring again to FIGS. 2 and 3, the car air conditioner maintenance apparatus 10 according to the preferred embodiment of the present invention is configured to have vacuum leakage and diagnosis of each component, replenishment of refrigerant, and full refrigeration of refrigerant as its maintenance items. Each maintenance item automatically. First, the inspector allows both sides of the manifold block 30 to be connected to and connected to the low pressure line 3 and the high pressure line 5 of the car air conditioner, respectively. Then, the temperature detection sensor 42 is connected to the low pressure line 3, wherein the temperature detection sensor 42 is connected to the evaporator 42 close to the temperature of the refrigerant circulation line by the refrigerant flowing through the evaporator 42 It increases the accuracy of the measurement by allowing measurement. In addition, the engine speed detection sensor 44 is connected to the engine ignition line (9, fuel line or CAS in the case of a diesel car) to detect the engine speed when the air conditioner of the vehicle is operated. And the manifold block 30 is connected to the air conditioner refrigerant supplement tank 100 is connected.

When the inspection preparation is completed, the inspector selects an item to be inspected using the keyboard 48. At this time, the selected maintenance items include vacuum leakage, diagnosis of each component, replenishment of refrigerant, or full filling, and there is no abnormality during diagnosis, but the menu can be set to replenish refrigerant when the refrigerant is insufficient. The corresponding menu will be displayed on the display 46 and may be selected by the inspector}. When the maintenance item of the inspector is input {in this case, the engine is driven and the air conditioner is in operation, and the engine speed input through the engine speed detection sensor 44 is within the range of the reference speed}, the low pressure sensor 38 The refrigerant pressure of the low pressure line (3) and the refrigerant pressure of the high pressure line (5) are measured through the and high pressure sensor (40) and input to the controller (50).

Through the degree detection sensor 42, the rear end of the evaporator 2, the surface temperature of the low pressure line 3 is input to the controller 50. These measured values are compared with the data already input to the controller 50 (FIG. 5), and the corresponding item (the item to be displayed through the display 46) is displayed on the display 46 to form a refrigerant or a car air conditioner. If there is something wrong with the part, make sure that the inspector can take the necessary action.

When the inspector selects replenishment or full charge of the refrigerant as a maintenance item, the automobile air conditioner maintenance apparatus 10 according to the preferred embodiment of the present invention supplies the refrigerant of the air conditioner refrigerant supplement tank 100 through the refrigerant circulation line of the automobile air conditioner To inject

As shown in FIG. 6, the temperature detected through the degree detection sensor 42 is confirmed to be the reference temperature, and if there is no abnormality, the operation is completed.

At this time, the method for injecting a refrigerant for an automobile air conditioner according to a preferred embodiment of the present invention is a vehicle comprising a manifold block 30, a low pressure sensor 38, a high pressure sensor 40, a temperature detection sensor 42, and a controller 50. Using the air conditioner maintenance device, the refrigerant is injected according to the characteristics of the car air conditioner. That is, the components constituting the automobile air conditioner are changed in various conditions according to the operation period of the vehicle, and accordingly the injection amount of the refrigerant is also changed. The present invention is to inject the refrigerant in a state capable of exerting an optimal cooling effect when injecting the refrigerant in order to satisfy these conditions.

2, 5, and 6, when the inspector selects supplement or full charge of refrigerant in the maintenance item through the keyboard 48, refrigerant is injected into the vehicle air conditioner through the manifold block 30. At this time, the refrigerant is introduced from the air conditioner refrigerant supplement tank 100 by the operation of the low and high pressure solenoids 34 and 36 of the manifold block 30. That is, when the high pressure solenoid 36 is closed and the low pressure solenoid 34 is opened, the refrigerant of the air conditioner refrigerant supplement tank 100 is injected into the vehicle air conditioner through the low pressure line 3 (A). If the refrigerant is continuously injected in this state, as shown in FIG. 6, the temperature of the low pressure line 3 continues to decrease at the temperature A at the time of injection. In the present invention, when the surface temperature of the low-pressure line 3 of the automobile air conditioner detected through the temperature detection sensor 42 in the state in which the injection of the refrigerant is continuously performed, the value is set as the reference temperature. The setting of the reference temperature starts by comparing the temperature input through the temperature detection sensor 42 with the temperature at the refrigerant injection point in the controller 50, and is detected by the temperature detection sensor 42 made with the refrigerant injection. If the new temperature entered is lower than the previously set reference temperature, the new temperature is updated to the reference temperature. At this time, the storage of the reference temperature is not shown, but will be achieved by storing it in a memory or the like. On the other hand, if the refrigerant is continuously injected in such a state, when the surface temperature of the low pressure line 3 detected by the temperature detection sensor 42 in a state in which the refrigerant is continuously injected becomes higher than the reference temperature (C) In this case, in the device 10 according to the present invention, the injection of refrigerant is stopped (the low pressure solenoid 34 will be closed), the manifold block {30, the high pressure solenoid 36 is opened} and the vehicle air conditioner The refrigerant is recovered. As such, in the process of continuously recovering the refrigerant, when the surface temperature of the low pressure line 3 detected through the temperature detection sensor 42 reaches the reference temperature, the recovery of the refrigerant is stopped to complete the replenishment or full filling operation of the refrigerant. do.

As described above, the replenishment and full charge of the refrigerant using the automobile air conditioner maintenance device according to the present invention allows the amount of refrigerant to be compensated according to the temperature difference in the operating state of the automobile air conditioner after the refrigerant is charged, unlike the conventional one. Effective refrigerant charging is made according to the performance or condition of.

As described above, although the car air conditioner maintenance apparatus according to the preferred embodiment of the present invention is illustrated in accordance with the above description and drawings, it is merely for example, and various changes within a range not departing from the technical spirit of the present invention and Those skilled in the art will appreciate that changes are possible.

1: car air conditioner 2: evaporator
3: Low pressure line 4: Compressor
5: High pressure line 6: Condenser
7: Receiver dryer 8: Expansion valve
9: engine ignition line 10: car air conditioning maintenance device
20: frame 30: manifold block
34: low pressure solenoid 36: high pressure solenoid
38: low pressure sensor 40: high pressure sensor
42: temperature detection sensor 44: engine speed detection sensor
46: display 48: keyboard
50: controller 100: air conditioning refrigerant supplement tank

Claims (4)

Maintenance of a car air conditioner comprising an evaporator, a compressor, a condenser, a receiver dryer and an expansion valve, and a refrigerant circulation line having a low pressure line connected by connecting the evaporator and a compressor and a high pressure line connected by connecting the compressor and a condenser. In the above car air conditioner maintenance device,
A low pressure sensor connected to the low pressure line to detect the pressure of the refrigerant and generate a low pressure detection signal for the detected value;
A high pressure sensor connected to the high pressure line to detect the pressure of the refrigerant and generate a high pressure detection signal for the detected value;
A temperature detection sensor connected to the low pressure line to detect a surface temperature of the low pressure line and generate a temperature detection signal for the detected value;
Data for causes, judgments and countermeasures according to the pressure and temperature detected during the inspection of the car air conditioner are stored in advance, and the low pressure detection signal, the high pressure detection signal and the temperature detection generated from the low pressure sensor, the high pressure sensor and the temperature detection sensor A vehicle air conditioner maintenance apparatus comprising a controller that receives a signal and causes a countermeasure to be displayed through a display. According to claim 1,
A manifold block to which the low pressure sensor and the high pressure sensor are respectively connected to both sides;
The controller further includes a keyboard connected to the controller to select and input maintenance items of the car air conditioner, and the manifold block has a low pressure solenoid to connect and cut off the connection with the low pressure line on one side to which the low pressure sensor is connected. Installed, phase
A high-pressure solenoid is installed on the other side to which the high-pressure sensor is connected to connect and cut off the connection with the high-pressure line, and is connected to an air conditioner refrigerant supplement tank between the low-pressure solenoid and the high-pressure solenoid, and the controller leaks and leaks vacuum. The diagnosis, the replenishment of refrigerant, the maintenance of the vehicle air conditioner, which is distinguished by the full charge of the refrigerant, the vehicle air conditioner maintenance device, characterized in that input in advance. The method of claim 1 or 2,
It characterized in that it further comprises an engine speed sensor for detecting the engine speed of the motor vehicle connected to the vehicle on which the vehicle air conditioner is installed, and generating an engine speed detection signal for the detected value to be input to the controller. Automotive air conditioning maintenance. In the vehicle air conditioning refrigerant injection method using a car air conditioning maintenance device comprising a manifold block, a low pressure sensor, a high pressure sensor, a temperature detection sensor and a controller,
Starting to inject refrigerant into the vehicle air conditioner through the manifold block;
Setting the value as a reference temperature when the surface temperature of the low pressure line of the automobile air conditioner detected by the temperature detection sensor decreases while the refrigerant is continuously injected;
When the surface temperature of the low pressure line detected by the temperature detection sensor is higher than the reference temperature while the injection of the refrigerant continues, the injection of the refrigerant is stopped, and the refrigerant of the vehicle air conditioner is recovered through the manifold block. Letting;
And stopping the recovery of the refrigerant when the surface temperature of the low pressure line detected through the temperature detection sensor reaches the reference temperature while the refrigerant is continuously recovered.

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