KR100235699B1 - Automotive Air Conditioning System - Google Patents

Abstract

The present invention relates to a car air conditioner, a refrigeration cycle that is speeched through a compressor (10), a condenser (20), an expansion valve (30), an evaporator (40) and a receiver (50) and a refrigerant pipe (60) to form a closed circuit. In the method, the inlet and outlet side refrigerant pipes of the receiver 50 are branched to form a bypass pipe 80, and a space for storing a predetermined amount of compressed refrigerant on the pipeline of the bypass pipe 80 is provided. The storage tank 90 is provided, and the control valves 81 and 82 for opening and closing the pipes are installed in the front and rear bypass pipes 80 of the storage tank 90, respectively, according to the control of the control means. By opening and closing the pipe to store or discharge compressed refrigerant, when the load on the engine is stopped or running, the compressor is stopped. At the same time, the refrigerant is discharged. When the engine load is small, the refrigerant is stored in the storage tank to prevent fuel consumption. .

Description

Automotive Air Conditioning System

The present invention relates to a car air conditioner for air conditioning and heating of a car interior. In particular, in order to minimize the load on the engine during air conditioning, a separate compressed refrigerant storage tank is installed to store the compressed refrigerant when the engine load is small and load the engine. It is related to a vehicle air conditioning system that can be air-conditioned by circulating the stored compressed refrigerant when large.

In general, the air conditioner is forced to circulate the refrigerant by mechanical means to exchange heat with the outside through compression, condensation, expansion, and evaporation, thereby cooling and heating the vehicle interior. In the air conditioning, the absorption (heating) temperature is determined by the amount of heat absorbed (heating) when the refrigerant per unit weight evaporates (condenses) through the evaporator, that is, the specific enthalpy difference between the evaporator inlet and the outlet.

As an example, the refrigeration cycle is compressed to a high temperature and high pressure in the compressor 10 driven by receiving the engine rotational force as shown in Figure 1 and then condensed liquefied in the condenser 20, passing through the expansion valve 30, axially inflated and low pressure The low temperature and low pressure refrigerant, which is reduced in pressure and temperature in the expansion valve 30, flows into the evaporator 30, evaporates while being heat-exchanged with indoor air, and flows into the compressor 10.

In addition, a receiver 50 is provided between the expansion valve 30 and the evaporator 40 to prevent the gas refrigerant, which is not completely condensed in the refrigerant that has been reduced in temperature by being expanded in the expansion valve 30, into the evaporator 40. It is provided, which is sequentially addressed to the refrigerant pipe (60) to form a closed circuit.

The refrigeration cycle configured as described above exchanges heat through the condenser 20 and the evaporator 40 while the refrigerant circulates by a mechanical method, and the cold air exchanged in the evaporator 40 is blown by the blower fan 70. It is discharged to the room to perform the desired bar cooling.

However, since the compressor of the car air conditioner receives power from the rotational force of the engine and circulates the refrigerant by a mechanical method, when the car air conditioner is driven, a load is directly applied to the engine to reduce the driving state of the vehicle.

In other words, if the vehicle is not sufficiently resilient at low speed or on the road, if the engine is excessively loaded by car air conditioning, the engine torque is reduced and the gears are shifted while driving.In addition, fuel consumption is increased by increasing fuel consumption. There was a problem that is inhibited.

The present invention has been made in view of this point, in particular, by installing an auxiliary tank for storing the compressed refrigerant in the refrigeration cycle, if the vehicle is sufficiently accelerated and the engine is not overwhelmed to store the compressed refrigerant in the auxiliary tank and load the engine When the torque decreases due to excessive pressure, the compressor is stopped and at the same time, the refrigerant is circulated by the stored compressed refrigerant to provide a vehicle air conditioning system that prevents the reduction of engine torque and the increase of fuel consumption when driving the air conditioner. The purpose is.

In order to achieve the above object, the present invention provides a bypass tube in which a compressor, a condenser, an expansion valve, a receiver, and an evaporator are sequentially addressed and a refrigerant cycle is circulated by a mechanical method. And a compressed refrigerant storage tank for storing the high-pressure refrigerant discharged from the expansion valve on the bypass pipe path, and an electronic valve installed in the bypass pipes at the front and rear ends of the compressed refrigerant storage tank to control the suction and discharge of the refrigerant. And control means for controlling the opening and closing of the electronic valve by a predetermined method.

A pressure sensor is provided at a predetermined position of the receiver and the compressed refrigerant storage tank.

In the car air conditioner, the vehicle speed detection means for detecting a vehicle speed, the engine speed detection means for detecting the rotational speed of the engine, the pressure detection means for detecting the pressure of the receiver and the compressed refrigerant storage tank, the vehicle speed detection By comparing the input signal from the means, engine speed detection means, and pressure sensing means with the preset data table, if the load on the engine is small, the compressed refrigerant is stored in the compressed refrigerant storage tank. It characterized in that it consists of a microcomputer to stop and control the discharged compressed refrigerant stored in the storage tank.

In the control method of the car air conditioner, the vehicle speed judging step of determining whether the vehicle speed is a certain speed or more when the car air conditioner is being driven, and the engine load amount by comparing the engine speed with the set speed while the vehicle speed is above the predetermined speed Determination of the engine load amount to detect the step, Tank pressure determination step of comparing the pressure of the storage tank after the engine load is determined, Load control step of controlling the opening and closing of the outflow of the compressor and storage refrigerant in accordance with the engine load and the tank pressure Characterized in that performing.

In the load control step, when the engine load and the tank pressure are greater than the reference value, the compressor is stopped and the refrigerant is discharged from the storage tank. When the engine load is large and the tank pressure is less than the reference pressure, the compressor is driven to store the refrigerant in the storage tank. Steps; On the contrary, when the engine load is small and the tank pressure is higher than the reference pressure, the compressor is stopped and the stored refrigerant is discharged. When the engine load and the tank pressure are lower than the reference value, the compressor is driven to store the refrigerant in the storage tank. It is done.

According to this configuration and method, the present invention does not overload the engine by allowing the refrigerant to be stored or discharged in the storage tank according to the load applied to the engine during stop or driving.

1 is a schematic diagram showing a typical vehicle refrigeration cycle,

2 is a system diagram showing a freezing cycle of the present invention,

3 is a block circuit diagram showing a refrigeration cycle control apparatus of the present invention;

Figure 4 is a flow chart showing a refrigeration cycle control method of the present invention.

* Description of the symbols for the main parts of the drawings *

10: compressor 20: condenser

30: expansion valve 40: evaporator

50: receiver 60: refrigerant tube

70: blow fan 80: bypass tube

81,82: Electromagnetic valve 90: Compressed refrigerant storage tank

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows the schematic diagram of the refrigeration cycle of the present invention, the same reference numerals are attached to the same configuration as the prior art.

The present invention is a refrigeration cycle in which the compressor 10, the condenser 20, the expansion valve 30, the evaporator 40, and the receiver 50 and the refrigerant pipe 60 is formed to form a closed circuit, the receiver ( A storage tank 90 having a space for branching the inlet and outlet refrigerant pipes 50 to form a bypass pipe 80 and storing a predetermined amount of compressed refrigerant on the pipeline of the bypass pipe 80. And control valves 81 and 82 for opening and closing the pipes in front and rear end bypass pipes 80 of the storage tank 90, respectively. By opening and closing the compressed refrigerant is stored or discharged.

Figure 3 is a block circuit diagram showing a refrigeration cycle control apparatus of the present invention, in the refrigeration cycle of Figure 2, the vehicle speed sensor 100 for detecting the vehicle speed, and the engine speed sensor 110 for detecting the rotational speed of the engine And a pressure sensor 51 for detecting the pressure of the receiver 50 and a pressure sensor 91 for detecting the pressure of the compressed refrigerant storage tank 90, and comparing the signal input from the sensor with a preset data table. When the load on the engine is small, the compressed refrigerant is stored in the compressed refrigerant storage tank. On the contrary, when the engine is heavily loaded, the compressor 10 is stopped and the electronic valves 81 and 82 are controlled to store the compressed refrigerant in the storage tank. It is composed of a microcomputer 120 for controlling to be discharged.

Hereinafter, the operation and the refrigeration cycle control method according to an embodiment of the present invention will be described in detail with reference to FIGS.

According to the present invention, when the air conditioner is being driven, the microcomputer 120 determines whether to drive the compressor 10 based on the signal detected by the vehicle speed sensor 100 (S1-S2), wherein the vehicle speed is a constant speed (10Km / h). Only when it is above), it is controlled by the refrigerating cycle set method.

That is, the current engine speed and the set reference speed is compared (S3) by the detection signal input from the engine speed sensor 110 in a state in which the vehicle speed is higher than the set speed, which indicates whether the vehicle speed is being driven by the elasticity. In order to detect the load on the engine by judging whether it is being accelerated, the compressor pressure is controlled by measuring the refrigerant pressure stored in the storage tank 90 in the state where the engine load is determined (S4).

If the engine load and the tank pressure are greater than the reference value, for example, when driving the compressor, when driving the car air conditioner while driving on a hill, the engine is overloaded and the vehicle speed decreases while the torque decreases. ) And the electronic valve 82 at the rear end of the storage tank 90 is opened to discharge the refrigerant to reduce the load on the engine.

On the contrary, when the engine load is small and the tank pressure is greater than the reference pressure, the compressor 10 is driven because the engine is not overloaded because the vehicle can maintain the speed due to inertia when the vehicle is decelerated during driving or descending a hill road. The refrigerant is stored by opening the electron valve 81 at the front end of the storage tank 90.

As described above, in the refrigeration cycle of a car air conditioner, a refrigerant storage tank is installed in parallel with a receiver installed between an expansion valve and an evaporator, and the engine is overloaded by driving the car air conditioner while maintaining a vehicle speed above a predetermined speed. If the engine stops, the compressor is stopped and the stored refrigerant is discharged to carry out air conditioning to reduce the load on the engine.On the contrary, even when the car air conditioner is operated, the compressor can be stored and the refrigerant can be stored at the same time if the torque is not applied to the engine. Therefore, it is possible to improve fuel economy by reducing fuel consumption due to air conditioning.

Claims (5)

In a refrigeration cycle in which a compressor, a condenser, an expansion valve, a receiver, and an evaporator are sequentially delivered and the refrigerant is circulated by a mechanical method, the bypass pipe is branched and expanded on the bypass pipe and the bypass pipe is expanded. A compressed refrigerant storage tank for storing the high-pressure refrigerant discharged from the valve, an electronic valve installed in the bypass pipes at the front and rear ends of the compressed refrigerant storage tank to control the suction and discharge of the refrigerant, and a method for opening and closing the electronic valve. Automotive air conditioning system, characterized in that consisting of a control means to control by. The vehicle air conditioning system according to claim 1, wherein a pressure sensor is provided at a predetermined position of the receiver and the compressed refrigerant storage tank. In the car air conditioner, the vehicle speed detection means for detecting a vehicle speed, the engine speed detection means for detecting the rotational speed of the engine, the pressure detection means for detecting the pressure of the receiver and the compressed refrigerant storage tank, the vehicle speed detection By comparing the input signal from the means, engine speed detection means, and pressure sensing means with the preset data table, if the load on the engine is small, the compressed refrigerant is stored in the compressed refrigerant storage tank. The vehicle air conditioning system, comprising: a microcomputer for controlling the discharge of the compressed refrigerant stored in the storage tank and stopping. In the car air conditioner air conditioning system control method, a vehicle speed determination step of determining whether the vehicle speed is a certain speed or more when the car air conditioner is being driven, and comparing the engine speed with the set speed while the vehicle speed is a predetermined speed or more, Determining the engine load amount detection step, the tank pressure determination step of comparing the pressure of the storage tank after the engine load amount is determined, and the load control step of controlling the opening and closing of the compressor and the storage refrigerant outflow in accordance with the engine load amount and the tank pressure Car air conditioning system control method, characterized in that performing. The method of claim 4, wherein the load control step stops the compressor and discharges the refrigerant in the storage tank when the engine load and the tank pressure are greater than the reference value, and drives the compressor when the engine load is large and the tank pressure is less than the reference pressure. Storing the refrigerant in the tank; On the contrary, when the engine load is small and the tank pressure is higher than the reference pressure, the compressor is stopped and the stored refrigerant is discharged. When the engine load and the tank pressure are lower than the reference value, the compressor is driven to store the refrigerant in the storage tank. Vehicle air conditioning system control method.