KR101348606B1 - Method for analyzing crankcase flow characteristics of electromagnetic control valve for compressor of an automobile air conditioning control system - Google Patents

Abstract

The present invention relates to an electromagnetic control valve (ECV) applied to a variable displacement compressor of a vehicle air conditioning system. According to the present invention, an electromagnetic control valve (ECV) of a compressor for a vehicle air conditioning system is provided. By analyzing the flow characteristics of the crankcase in the interior and reflecting the results of the analysis in the design of the electronic control valve for the actual vehicle air conditioning system, the efficiency of the compressor can be improved and thereby, not only the vehicle air conditioning system but also the vehicle Provided are a method for designing an electronic control valve for a vehicle air conditioning system and a method for designing an electronic control valve for a vehicle air conditioning system compressor using the same, which are configured to improve overall efficiency and fuel economy.

Description

Method for analyzing crankcase flow characteristics of electromagnetic control valve for compressor of an automobile air conditioning control system

The present invention relates to an electromagnetic control valve (hereinafter referred to as 'ECV') applied to a variable displacement compressor of a vehicle air conditioning system.

More specifically, the present invention relates to a method for analyzing the flow characteristics of a crankcase in an electronic control valve (ECV) of a compressor for an air conditioning system of a vehicle.

In addition, the present invention, by reflecting the crankcase flow characteristics analysis method of the electronic control valve for the vehicle air conditioning system as described above in the design of the electronic control valve for the actual vehicle air conditioning system, to manufacture an electronic control valve having a more improved performance It relates to a design method of an electronic control valve for a vehicle air conditioning system.

Recently, the cost of fuel such as petroleum is increasing due to the problem of resource depletion, and according to this trend, each car maker is focusing on the development of high-efficiency high-efficiency vehicle (see Ref. 1).

In addition, for the comfort of passengers, the indoor temperature of the vehicle should be maintained at an appropriate temperature range at all times. For this purpose, an air conditioning system such as the air conditioner of the vehicle should be operated. However, in general, fuel consumption increases when the air conditioner is operated while driving. There is a problem.

Therefore, in order to manufacture a more efficient vehicle, in recent years, in addition to simply improving the efficiency of the power system, improving the efficiency of such an air conditioning system to provide a high efficiency air conditioning system has emerged as one of the main challenges.

More specifically, the vehicle air conditioning system is composed of a compressor and an electromagnetic control valve (ECV) connected to the compressor (see Ref. 2), and since the compressor generally consumes a lot of engine power, For high efficiency air conditioning systems it is important to increase the efficiency of the compressor (see Ref. 3).

To this end, in recent years, a variable capacity compressor having less energy consumption than a conventional fixed capacity compressor has been used to increase the efficiency of the compressor.

That is, the variable displacement compressor operates constantly when the air conditioning system is switched on and the refrigerant flow is controlled by appropriately changing the compressor capacity to an efficient capacity according to the operating conditions (see Reference 4).

Here, one of the important factors for controlling the operation of the compressor as described above is a control valve, that is, the control valve senses the suction pressure (suction pressure) and based on the difference between the crankcase (crankcase) and the suction pressure It operates to control the angle of the swash plate (see Ref. 5).

In addition, the capacity of the compressor is changed by changing the inclination angle of the inclined plate controlled by the suction pressure in the crank chamber (see Reference 6), where the inclination angle of the inclined plate corresponds to the cooling load. Means a suction pressure which causes a flow rate of the refrigerant in the cooling circuit (see Ref. 7).

In addition, as a control valve used in a vehicle pressure gauge, in general, two types of control valves are widely used, one of which is a mechanical control valve (MCV), and the other is an electronic control valve ( Electromagnetic Control Valve (ECV).

Here, recently, the use of ECV in a variable displacement compressor is known to be suitable for operating and controlling the entire system efficiently and effectively.

In addition, the capacity of the compressor corresponds to the air conditioning load, the compressor is controlled through a control valve by a predetermined suction pressure, as the control valve, generally, a solenoid (solenoid) valve is widely used, for this purpose, The ECU controls the signal from an external source.

More specifically, the electronic control valve (ECV) is a suction and crankcase port pressure by a pulse width modulation input signal supplied from an external control device. By controlling the swash (wobble) plate at a certain angle, by controlling the compressor for the vehicle air conditioning system is configured to maintain an appropriate temperature range inside the vehicle.

As described above, in order to improve the fuel efficiency of the vehicle, it is required to improve the efficiency of the air conditioning system in addition to the dynamometer, and to increase the efficiency of the compressor that consumes a lot of engine power in order to increase the efficiency of the air conditioning system. desirable.

In addition, since the compressor is controlled by an electronic control valve (ECV), therefore, in order to improve the efficiency of the compressor, it is required to improve the performance of the electronic control valve (ECV). It is desirable to design the ECV to analyze the flow characteristics and to have the performance and characteristics appropriate to the application based on the results of such analysis, but there are no analysis methods or design methods that satisfy all such requirements.

[references]

YJ Lee, GH Lee and BE Lim, "Noise Evaluation of a Control Valve in a Variable Compressor", 4th International Conference on Sustainable Automotive Technologies, RMIT University, Melbourne, Australia, (2012), p 337-341.

2. Y. Huang, RJ Callahan, SA Harte, and LW Smith, "Electronic control strategy for A / C compressor", United States Patent no. 6675592B2. (2004).

3.YJ Lee, GH Lee and BE Lim, "Design for Improving the Performance of a Control Valve in a Variable Compressor", 4th International Conference on Sustainable Automotive Technologies, RMIT University, Melbourne, Australia, (2012), p 343-348. .

4. M. Stubblefield and JH Haynes, "Automotive heating and air conditioning", Haynes Publication Inc., California, USA, (2000), p 6-7.

5.BH Dwiggins, "Automotive Air Conditioning", 8th edition, Thomson Learning Inc. New York, USA, (2002), p 173.

6. Y. Takano, H. Kishita, K. Yamasaki and Y. Niimi, "Compressor control device for vehicle air conditioner", United States Patent no. 5867996A. (1999).

7. U. Satoshi, H. Tatsuya, M. Kazuhiko, H. Yuji, N. Masami and O. Masaki, "Control valve of variable displacement compressor", United States Patent no. 6637228. (2003).

[Prior Art Literature]

1. Japanese Patent Application No. 2011-217463 (September 30, 2011)

2. Registration No. 10-1057391 (August 10, 2011)

3. Open Patent Publication No. 10-2011-0035597 (Apr.

4. Japanese Patent Application No. 2001-00043595 (Feb. 20, 2001)

The present invention is to solve the problems of the prior art as described above, and therefore the object of the present invention, in order to improve the compressor efficiency of the vehicle air conditioning system, flow such as the flow of the refrigerant inside the electronic control valve (ECV) An object of the present invention is to provide a method of analyzing crankcase flow characteristics of an electronic control valve for a vehicle air conditioning system compressor for analyzing characteristics.

In addition, another object of the present invention is to improve the compressor efficiency of a vehicle air conditioning system by applying the analysis result of the crankcase flow characteristic analysis method of the electronic control valve for a vehicle air conditioning system compressor as described above to the actual ECV design. At the same time, to provide a method of designing an electronic control valve for a vehicle air conditioning system compressor for improving the efficiency and fuel efficiency of the vehicle air conditioning system and the entire vehicle.

In order to achieve the above object, according to the present invention, the electronic control to improve the performance of the electromagnetic control valve (ECV) applied to a variable displacement compressor of the vehicle air conditioning system (variable displacement compressor) A method for analyzing crankcase flow characteristics of an electronically controlled valve for a vehicle air conditioning system compressor for analyzing flow characteristics at a crankcase port in a valve, the three types being directly related to controlling the air flow of the crankcase port. A stroke measuring step of measuring a main stroke, a guide stroke, a plunger stroke and a bellows stroke, respectively; A flow characteristic measurement step of measuring the air flow in the crankcase port while varying the supply current with respect to the respective stroke values measured in the stroke measurement step; The air flow in the crankcase port is examined by checking whether the air flow in the crankcase port measured in the flow characteristic measurement step is within a range of a maximum flow limit line and a minimum flow limit line. A flow characteristic analysis step taking only when a flow is within a range of the maximum flow limit line and the minimum flow limit line; And repeating the above steps to determine the values of the guide stroke, the plunger stroke and the bellows stroke, respectively. The method for analyzing crankcase flow characteristics of an electronic control valve for a compressor of a vehicle air conditioning system is characterized in that it comprises a. Is provided.

Here, the flow characteristic measurement step, characterized in that configured to measure the air flow in the crankcase port while varying the supply current from 0.20Amp to 0.95Amp.

In addition, according to the present invention, by analyzing the flow characteristics of the crankcase port in the electronic control valve applied to the variable displacement compressor of the vehicle air conditioning system for improving the performance and efficiency of the electronic control valve compressor In the control valve design method, using the crankcase flow characteristic analysis method of the electronic control valve for a vehicle air conditioning system compressor described above, the design of the electronic control valve for the vehicle air conditioning system compressor is based on the analysis result of the flow characteristic. Provided is an electronic control valve design method for a vehicle air conditioning system compressor, which is configured to perform.

As described above, according to the present invention, a method for analyzing crankcase flow characteristics of an electronic control valve for a vehicle air conditioning system compressor for analyzing flow characteristics such as a flow of a refrigerant in an electronic control valve (ECV) is provided. The compressor efficiency of the vehicle air conditioning system can be improved by reflecting the flow characteristic analysis result of the control valve in the actual electronic control valve design.

In addition, according to the present invention, by applying the analysis results of the crankcase flow characteristics analysis method of the electronic control valve for the vehicle air conditioning system as described above to the actual ECV design, the compressor efficiency of the vehicle air conditioning system can be improved. By providing an electronic control valve design method of a vehicle air conditioning system compressor, it is possible to improve the efficiency and fuel economy of the vehicle as well as the vehicle air conditioning system.

1 is a cross-sectional view schematically showing the overall configuration of an electronic control valve (ECV) for controlling the angle of the swash plate of a variable displacement compressor for a vehicle.
2 is a view schematically showing the operation of the switched-on state of the ECV.
3 is a view schematically showing the operation of the switch-off state of the ECV.
4 is a diagram illustrating a design example of a basic ECV including an internal configuration.
5 is a view showing an ECV assembling apparatus.
6 is a diagram schematically showing the configuration of an airboard tester for experimental analysis of flow characteristics.
7 is a graph showing test results of ECV samples.
8 is a flowchart schematically illustrating the overall configuration of a method for analyzing crankcase flow characteristics of an electronic control valve for a vehicle air conditioning system compressor according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described a specific embodiment of the crankcase flow characteristics analysis method of the electronic control valve for a vehicle air conditioning system compressor according to the present invention.

Hereinafter, it is to be noted that the following description is only an embodiment for carrying out the present invention, and the present invention is not limited to the contents of the embodiments described below.

In the following description of the embodiments of the present invention, parts that are the same as or similar to those of the prior art, or which can be easily understood and practiced by a person skilled in the art, It is important to bear in mind that we omit.

That is, the present invention, as described below, in order to improve the compressor efficiency of the vehicle air conditioning system, the electronic control valve for a vehicle air conditioning system compressor for analyzing the flow characteristics such as the flow of the refrigerant in the electronic control valve (ECV) Crankcase flow characteristics analysis method.

In addition, the present invention, as described later, by applying the analysis results of the crankcase flow characteristics analysis method of the electronic control valve for a vehicle air conditioning system compressor to the actual ECV design, while improving the compressor efficiency of the vehicle air conditioning system, Thereby, the present invention relates to a method for designing an electronic control valve for a vehicle air conditioning system compressor for improving the efficiency and fuel efficiency of the vehicle air conditioning system and the entire vehicle.

Next, with reference to the accompanying drawings, a description will be given of a specific embodiment of the crankcase flow characteristics analysis method of the electronic control valve for a vehicle air conditioning system compressor according to the present invention as described above.

First, referring to FIG. 1, FIG. 1 is a diagram schematically illustrating an overall configuration of a vehicle compressor in which an ECV is installed.

As shown in FIG. 1, the ECV is typically a number of different factors, such as compressor RPM, evaporator air flow, condenser air flow, environmental conditions, vehicle interior temperature, and the like. It is installed and used in a compressor operating without a clutch to maintain the suction pressure as a function of the average input current flowing through it within the limits of the air conditioning system capacity depending on the field.

2 and 3, FIG. 2 is a diagram schematically showing the operation of the switch-on state of the ECV, and FIG. 3 is a diagram schematically showing the operation of the switch-off state of the ECV.

As shown in Figs. 2 and 3, the ECV has three ports, a suction port Ps, a crankcase port Pc, and a discharge port Pd. The port serves primarily as a connecting passage for airflow.

In addition, in the ECV, there are two states in which the pressure comes in and the outgoing occurs according to the operation of each port described above. That is, FIG. Indicates the case where the pressure goes out, respectively.

First, when a pulse width modulated (PWM) current is applied to the ECV to maximize discharge in a switched-on state as shown in FIG. 2, the suction port Ps is provided at the crankcase port Pc. When the flow to the furnace is open, the pressure is greater at the crankcase port Pc than the suction port Ps.

In addition, due to the movement of the piston, the flow pressure at the maximum stroke is maximum at the discharge port Pd, and the crankcase port Pc pressure when the crankcase port Pc is closed. This decrease results in the maximum angle of the swash plate at the discharge port Pd.

Next, as shown in FIG. 3, when the current pulsed modulated (PWM) to the ECV is cut off and switched off, that is, when the flow from the discharge port (Pd) to the crankcase port (Pc) is opened, The pressure at the discharge port Pd is greater than the crankcase port Pc and the flow from the crankcase port Pc to the suction port Ps is closed.

The discharge port Pd pressure is then equilibrated with the crankcase port Pc whereby the crankcase port Pc delivers the maximum pressure based on the supply current and the PWM moving towards the closed position.

As a result, the discharge port Pd pressure decreases, so that the piston stroke stops, and finally, the inclined plate reaches the no angle position.

In addition, when designing an ECV for developing a new ECV, generally, various internal configurations are designed using CAD.

That is, referring to FIG. 4, FIG. 4 is a figure which shows the design example of the basic ECV including an internal structure.

More specifically, in the configuration of the ECV shown in FIG. 4, the main components are a magnetic coil, a plunger, a plunger spring, a plunger pin, and a plunger housing. housings, cover plates, cores, valve guides, bellows assy, bellows caps and the like.

In addition, in assembling such an ECV, each component is assembled using an ECV assembling machine, which is determined according to the punching of the jig and the requirements of each assembly step. (settled up) Pressure is supplied to complete the assembly.

That is, referring to Figure 5, Figure 5 is a view showing the ECV assembling apparatus.

In addition, the assembly process using the ECV assembly apparatus as shown in Figure 5 is as follows.

First, as a guide assembly step, the valve guide and the guide pin is assembled by setting the pressure of 1.5bar.

Next, in a plunger assembly step, the plunger and the plunger pin are set to a pressure of 1.3 bar, and assembled, where the length is 40.7 mm.

Subsequently, in the core assembly step, the spring is positioned in the plunger pin, the valve core is positioned through the plunger pin, the guide assembly is placed on the core and set to a pressure of 1.3 bar, whereby The length is 47.47 mm.

Subsequently, in the valve body assembly step, a 35.5 mm long valve body is placed in the core assembly through its hole and set at a pressure of 6.0 bar, where the total length is 66.8 mm.

Next, the stroke measurement of the ECV assembled as described above will be described. First, a stroke is a displacement or gap between two parts for passing air. Means.

In other words, there are three main strokes in ECV: guide stroke, plunger stroke and bellows stroke.

In addition, these strokes are very closely related to the air flow, and each stroke must be set within limits in order to obtain adequate data.

More specifically, in ECV, the standard value range of the plunger stroke, the guide stroke and the bellows stroke is one of the important issues, in particular, in order to obtain the range of the plunger and guide stroke values, the maximum value by the assembly device is achieved. Several punches are required with a depth of 0.05 mm.

In addition, the measurement of each stroke is made using a height guage, for example, Mitotoyo model: DDE 800.

Next, referring to FIG. 6, FIG. 6 schematically illustrates the configuration of an air board tester for experimental analysis of flow characteristics.

As shown in FIG. 6, the tester used for the flow characteristic analysis is configured to calculate the crankcase pressure flow, that is, the Pc flow. In this embodiment, ten ECV samples widely used in a vehicle are randomly selected and simulated. Was tested through.

More specifically, the maximum flow limit line and the minimum flow limit line for supply currents varying from 0.20 Amp to 0.95 Amp to obtain crankcase pressure flow in lpm (liter per minute). line) was measured and considered to be a significant result when the flow was in the range.

In addition, the parameter setting of the airboard tester to obtain the crankcase pressure flow was performed as follows.

Maximum high pressure: 0.69bar

Flow setting order: V1-> high; V2-> Pd, V3-> off; V4-> Pc flow; V5-> off; V6-> flow; V7-> all; V8-> all

DC power supply: 23.7 V

Duty controller power supply: 13.5V

Frequency: 400Hz

In addition, the test results performed as described above will be described.

First, five ECV samples were tested at the same time, guide strokes, plunger strokes and bellows strokes were respectively measured to obtain meaningful results, and the results obtained for each stroke parameter setting were finally compared.

At this time, a supply current varying from 0.20 Amp to 0.95 Amp was used as an input signal source from an external controller, and Pc flow corresponding to the supply current was measured.

That is, referring to FIG. 7, FIG. 7 is a graph illustrating test results of ECV samples.

As shown in Fig. 7, as the supply current increases, the crankcase port pressure Pc decreases because the opening length of the valve decreases as the magnetic force increases.

More evenly, in Fig. 7, the guide stroke, plunger stroke and bellows stroke for ECV Sample 1 were measured at 0.32 mm, 0.53 mm and 0.43 mm, respectively, which resulted in a flow in the 0.55 Amp current supply. The flow crosses the minimum flow limit line, indicating zero flow at 0.70 amp current supply.

In addition, for ECV Sample 2, the guide stroke, plunger stroke and bellows stroke were measured at 0.30 mm, 0.50 mm and 0.46 mm, respectively, which means that the flow crosses the maximum flow limit line only from 0.45 Amp current supply and from 0.55 Amp to the end. Since it is in range, it can be seen that it is a relatively good result.

In addition, for ECV sample 3, the guide stroke, plunger stroke and bellows stroke were measured to 0.31 mm, 0.46 mm and 0.45 mm, respectively, and it can be seen that the results are very good because all values are within the range.

Furthermore, for ECV Sample 4, the guide stroke, plunger stroke and bellows stroke were measured 0.30 mm, 0.66 mm and 0.38 mm, respectively, and in this case, all the values are in the range, and thus it is a very good result.

In addition, for ECV sample 5, guide strokes, plunger strokes and bellows strokes were measured as 0.30 mm, 0.68 mm and 0.34 mm, respectively.

From the above results, it can be seen that the crankcase port flow changes for each stroke, and in particular, the influence by the plunger stroke and the bellows stroke is large.

Therefore, from the above results, the limit of stroke required to obtain proper Pc flow is in the range of 0.30mm to 0.31mm for guide stroke, 0.62mm to 0.68mm for plunger stroke, and 0.34mm to 0.45mm for bellows stroke. Can be determined.

Moreover, from the experiments and analysis of the crankcase port pressure flow of the vehicle variable displacement compressor ECV as described above, it can be seen that there are three main strokes which are directly related to controlling the air flow. In ECVs, which are widely used in air conditioning systems, it is possible to determine the appropriate range of guide strokes, plunger strokes and bellows strokes to maintain the required crankcase port air flow as the supply current changes.

As noted above, the controlled suction and crankcase port pressures in the ECV can be analyzed experimentally so that the inventors are supplied to obtain important test data to maintain the vehicle's room temperature for passenger comfort. Crankcase flow characteristics of the electronic control valve for a vehicle air conditioning system compressor as described above by analyzing the flow characteristics inside the ECV, focusing on the correspondence between the amount of change of current and the flow of air from the crankcase port. An analysis method was proposed.

That is, referring to FIG. 8, FIG. 8 is a flowchart schematically illustrating an overall configuration of a method for analyzing crankcase flow characteristics of an electronic control valve for a vehicle air conditioning system compressor according to an exemplary embodiment of the present invention.

More specifically, as shown in Figure 8, the method for analyzing the crankcase flow characteristics of the electronic control valve for a vehicle air conditioning system compressor according to an embodiment of the present invention, divided into large, first, to control the air flow of the crankcase port In step S81, each of the three main strokes directly related to the guide stroke, the plunger stroke and the bellows stroke are measured, and for each of the stroke values measured in the step, the supply current is varied while changing the supply current. Measuring air flow (S82) and checking whether the air flow in the crankcase port measured in the step is within the range of the maximum flow limit line and the minimum flow limit line Air flow at the crankcase port is within the range of the maximum and minimum flow limits. It may be the method that takes only the case (S83), by the above-described steps are repeated comprises a step (S84) of determining the value of the guide stroke, the plunger stroke and the bellows stroke respectively.

Therefore, as described above, it is possible to implement a method for analyzing the crankcase flow characteristics of the electronic control valve for the air conditioning system according to the present invention.

In addition, the crankcase flow characteristics analysis method of the electronic control valve for a vehicle air conditioning system compressor according to an embodiment of the present invention, further comprising the step of performing the design of the ECV structure based on the flow characteristics analysis results obtained from the above-described steps. By including, it is possible to provide a design method of the ECV for a vehicle air conditioning system compressor configured to be able to perform the design of the ECV with improved efficiency.

That is, by implementing the method for analyzing the crankcase flow characteristics of the electronic control valve for a vehicle air conditioning system according to the present invention as described above, according to the present invention, such as the flow of refrigerant inside the electronic control valve (ECV) By analyzing the flow characteristics and reflecting the results of the analysis in the actual electronic control valve design, the compressor efficiency of the vehicle air conditioning system can be improved.

Furthermore, according to the present invention, the efficiency of the compressor can be improved by applying the analysis result by the crankcase flow characteristic analysis method of the electronic control valve for the vehicle air conditioning system as described above to the actual ECV design. As a result, the efficiency and fuel economy of the entire vehicle as well as the vehicle air conditioning system can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims. It is a matter of course.

Claims (3)

Analyzing the flow characteristics at the crankcase port in the electronic control valve to improve the performance of the electromagnetic control valve (ECV) applied to the variable displacement compressor of the vehicle air conditioning system. A method of analyzing crankcase flow characteristics of an electronic control valve for a vehicle air conditioning system compressor,
A stroke measuring step of measuring three main strokes, a guide stroke, a plunger stroke and a bellows stroke, respectively, which are directly related to controlling the air flow of the crankcase port;
A flow characteristic measurement step of measuring the air flow in the crankcase port while varying the supply current with respect to the respective stroke values measured in the stroke measurement step;
The air flow in the crankcase port is examined by checking whether the air flow in the crankcase port measured in the flow characteristic measurement step is within a range of a maximum flow limit line and a minimum flow limit line. A flow characteristic analysis step taking only when a flow is within a range of the maximum flow limit line and the minimum flow limit line; And
And repeating the above steps to determine the values of the guide stroke, the plunger stroke and the bellows stroke, respectively.
The method of claim 1,
The flow characteristic measurement step,
Crankcase flow characteristics analysis method of an electronic control valve for a vehicle air conditioning system compressor, characterized in that for measuring the air flow in the crankcase port while changing the supply current from 0.20Amp to 0.95Amp.
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