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KR100618243B1 - Compressor Control Method of Construction Heavy Equipment Air Conditioning System - Google Patents

Compressor Control Method of Construction Heavy Equipment Air Conditioning System Download PDF

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KR100618243B1
KR100618243B1 KR1019990060137A KR19990060137A KR100618243B1 KR 100618243 B1 KR100618243 B1 KR 100618243B1 KR 1019990060137 A KR1019990060137 A KR 1019990060137A KR 19990060137 A KR19990060137 A KR 19990060137A KR 100618243 B1 KR100618243 B1 KR 100618243B1
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compressor
engine
deviation
detected
target
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KR20010063168A (en
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홍만호
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두산인프라코어 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B60H1/3208—Vehicle drive related control of the compressor drive means, e.g. for fuel saving purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B60H1/00378—Air-conditioning arrangements specially adapted for particular vehicles for tractor or load vehicle cabins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B60H1/3216—Control means therefor for improving a change in operation duty of a compressor in a vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3232—Cooling devices using compression particularly adapted for load transporting vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
    • B60H2001/3261—Cooling devices information from a variable is obtained related to temperature of the air at an evaporating unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3266—Cooling devices information from a variable is obtained related to the operation of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3269—Cooling devices output of a control signal
    • B60H2001/327—Cooling devices output of a control signal related to a compressing unit
    • B60H2001/3273—Cooling devices output of a control signal related to a compressing unit related to the operation of the vehicle, e.g. the compressor driving torque

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

본 발명은 에어컨 시스템에서 냉매를 압축시키기 위한 컴프레셔를 제어하는 방법에 관한 것이다. 본 발명의 방법은 엔진 연료량 조절 레버의 각도에 따른 목표 엔진 회전수를 감지하는 목표 회전수 센서와 엔진의 실제 회전수를 감지하는 엔진 회전수 센서를 구비하여 엔진의 목표 회전수와 엔진의 실제 회전수에 의해 콤프레서의 작동을 제어하도록 된 컴프레셔 제어장치에 있어서, 상기 목표 회전수 센서로부터 감지된 목표 회전수와 상기 엔진 회전수 센서로부터 감지된 실제 회전수의 편차를 구하고, 컴프레셔를 작동하기 위한 작동 기준편차와 컴프레셔를 정지하기 위한 정지 기준편차를 다르게 설정하여 상기 감지된 편차가 작동 기준편차보다 크면 컴프레셔를 작동하게 제어하고, 상기 감지된 편차가 정지 기준편차보다 작으면 컴프레셔를 정지하게 제어한다. 그리고 증발기에 증발기 온도센서를 설치한 후 상기 증발기 온도센서가 감지한 온도가 소정 온도 이하가 되면 상기 컴프레셔의 작동을 정지하도록 제어한다. 따라서, 본 발명에 따르면 엔진의 출력을 작업 부하에 효과적으로 이용하게 하여 작업 효율을 높이고, 엔진의 과부하를 방지하므로써 수명을 연장하는 효과가 있다.The present invention relates to a method of controlling a compressor for compressing a refrigerant in an air conditioning system. The method of the present invention includes a target speed sensor for detecting a target engine speed according to an angle of the engine fuel level control lever and an engine speed sensor for detecting an actual speed of the engine, and the actual rotation of the engine and the engine. A compressor control device configured to control the operation of a compressor by a number, the method comprising: obtaining a deviation between a target rotational speed detected from the target rotational speed sensor and an actual rotational speed detected from the engine rotational speed sensor, and operating the compressor The reference deviation and the stop reference deviation for stopping the compressor are set differently to control the compressor to operate when the detected deviation is greater than the operation reference deviation, and to control the compressor to stop when the detected deviation is smaller than the stop reference deviation. After the evaporator temperature sensor is installed in the evaporator, the compressor is controlled to stop the operation when the temperature detected by the evaporator temperature sensor is lower than a predetermined temperature. Therefore, according to the present invention, it is possible to effectively use the output of the engine for the work load to increase the work efficiency and to prevent the overload of the engine, thereby extending the service life.

에어컨 컴프레셔 과부하Air conditioning compressor overload

Description

건설 중장비 에어컨 시스템의 컴프레셔 제어방법{Method for controlling a compressor of air conditioning systems} Method for controlling a compressor of air conditioning systems             

도 1은 종래의 컴프레셔 제어장치를 도시한 블록도,1 is a block diagram showing a conventional compressor control device,

도 2는 본 발명에 따른 컴프레셔 제어장치를 도시한 블록도,2 is a block diagram showing a compressor control device according to the present invention;

도 3은 본 발명에 따른 컴프레셔 제어장치의 세부 블록도이다.3 is a detailed block diagram of a compressor control apparatus according to the present invention.

*도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

21: 조작스위치 22: 목표회전수센서21: operation switch 22: target speed sensor

23: 엔진회전수센서 24: 증발기 온도센서23: engine speed sensor 24: evaporator temperature sensor

25: 에어컨제어장치 26: 컴프레셔25: air conditioner control unit 26: compressor

31,32: 비교기 33: 앤드게이트31, 32: comparator 33: endgate

34: 컴프레셔 구동회로 35: 컴프레셔 마그네트 클러치34: compressor drive circuit 35: compressor magnet clutch

본 발명은 건설 중장비의 에어컨 시스템에서 냉매를 압축시키기 위한 컴프레셔를 제어하는 방법에 관한 것이다.The present invention relates to a method of controlling a compressor for compressing a refrigerant in an air conditioning system of heavy construction equipment.

일반적으로, 에어컨 시스템은 차량이나 중장비의 실내 공기를 환기시키거나 실내 공기의 온도 및 습도를 조절하고 정화시키는 기능을 하는 공기조화 시스템의 일종이다. 이러한 에어컨 시스템은 기본적으로 기체 냉매를 고온, 고압으로 압축하는 컴프레셔와, 컴프레셔에 의해 압축된 기체 냉매를 액체 상태로 변화시키는 응축기, 응축기에 의해 액체 상태로 변화된 냉매를 저온, 저압의 액체 상태로 변화시키는 팽창기 및, 팽창기에 의해 저온, 저압의 액체 상태로 변화된 냉매를 증발시켜 다시 기체 상태로 변화시키므로써 공기의 열을 흡수하여 차량이나 중장비의 실내 공기를 차갑게 하는 증발기로 이루어 지며, 응축기와 팽창기 및 증발기를 순환하는 냉매는 엔진의 구동력에 의해 작동되는 컴프레셔에 의해 시스템 내를 순환하도록 되어 있다.In general, an air conditioning system is a type of air conditioning system that functions to ventilate indoor air of a vehicle or heavy equipment, or to regulate and purify indoor air temperature and humidity. Such an air conditioning system basically includes a compressor for compressing a gas refrigerant to a high temperature and a high pressure, a condenser for converting the gas refrigerant compressed by the compressor into a liquid state, and a refrigerant changed into a liquid state by a condenser to a low temperature and low pressure liquid state. It consists of an expander and an evaporator that absorbs the heat of the air and cools the indoor air of a vehicle or heavy equipment by evaporating the refrigerant changed into a liquid state of low temperature and low pressure by the expander to a gas state again. The refrigerant circulating in the evaporator is adapted to circulate in the system by a compressor operated by the driving force of the engine.

즉, 통상의 건설기계용 냉방장치의 냉매 압축용 컴프레셔는 원동기(엔진)의 회전축과 벨트로 연결되어 구동된다. 컴프레셔의 압축기구와, 압축기구와 엔진 사이에 회전력을 전달하는 풀리부와는 전기식 클러치(마그네트 클러치)에 의해 제어되도록 되어 있으며, 마그네트 클러치의 코일부에 전압이 인가되면 코일의 흡인력이 클러치부에 작용하여 엔진의 회전력이 컴프레셔의 압축기구부에 전달되어 압축 작용을 하여 냉매를 순환시키도록 작동된다.That is, the compressor for compressing the refrigerant of a conventional construction machine cooling device is driven by being connected to a rotating shaft of a prime mover (engine) by a belt. The compressor mechanism of the compressor and the pulley portion for transmitting the rotational force between the compressor mechanism and the engine are controlled by an electric clutch (magnet clutch). When voltage is applied to the coil portion of the magnet clutch, the suction force of the coil is applied to the clutch portion. And the rotational force of the engine is transmitted to the compression mechanism of the compressor to operate the compression to circulate the refrigerant.

이러한 에어컨 시스템에서 종래의 컴프레셔 제어회로는 도 1에 도시된 바와 같이, 조작스위치(10)와 에어컨 제어장치(12), 증발기 온도센서(16), 에어컨 컴프레셔(14)로 구성되어 있다. 도 1을 참조하면, 컴프레셔(14)의 동작은 운전자가 에어컨 조작 스위치(10)를 켰을 때, 컴프레셔의 클러치 코일부에 전압이 인가되도록 되어 있다. 그리고 운전실에 설치된 에어컨 유닛 내부의 증발기의 결빙을 방지하기 위하여 증발기 표면에 온도센서(16)를 설치하여 에어컨 제어장치(12)가 온도센서(16)로부터 신호를 검출하여 증발기 표면 온도가 수분의 결빙 온도(예컨대, 1℃~3℃) 부근 이하로 떨어지면 자동적으로 컴프레셔(14)의 인가전압을 차단하여 냉방작용을 정지시키고, 다시 온도가 상승하면 컴프레셔(14)에 전압을 인가하여 컴프레셔(14)를 작동시키므로써 증발기의 결빙을 방지하도록 제어한다.As shown in FIG. 1, the conventional compressor control circuit in the air conditioner system includes an operation switch 10, an air conditioner controller 12, an evaporator temperature sensor 16, and an air conditioner compressor 14. Referring to FIG. 1, the operation of the compressor 14 is such that a voltage is applied to the clutch coil portion of the compressor when the driver turns on the air conditioner operation switch 10. In order to prevent freezing of the evaporator inside the air conditioner unit installed in the cab, a temperature sensor 16 is installed on the surface of the evaporator so that the air conditioner controller 12 detects a signal from the temperature sensor 16 so that the evaporator surface temperature freezes moisture. When the temperature falls below a temperature (for example, 1 ° C. to 3 ° C.) or lower, the applied voltage of the compressor 14 is automatically cut off to stop the cooling operation. When the temperature rises again, a voltage is applied to the compressor 14 to provide the compressor 14. Control to prevent freezing of the evaporator.

그런데 컴프레셔가 구동될 경우 소요 동력은 통상 수 마력이 되고, 이 소요 동력은 엔진이 부담하게 된다. 건설기계(예로 들면, 굴삭기)가 작업을 하는 경우 굴삭부하는 작업 조건에 따라 변화하게 되며, 작업 부하가 큰 경우 원동기의 부담이 커지게 된다. 따라서 에어컨을 작동시키게 되면 컴프레셔의 소요 동력만큼 엔진 출력에서 소비하게 되므로 실제 작업에 투입되는 원동기 출력은 저하하게 되어 작업 효율의 저하를 가져온다. 즉, 종래와 같이 부하변동을 고려하지 않고 단순히 증발기의 온도제어에 의해서만 컴프레셔의 동작을 제어할 경우에 작업 효율이 저하되고 과부하에 의해 원동기의 수명이 저하되는 문제점이 있다.However, when the compressor is driven, the power required is usually several horsepower, and this power is borne by the engine. When a construction machine (for example, an excavator) works, the excavator load is changed according to the working conditions, and when the workload is large, the burden on the prime mover becomes large. Therefore, when the air conditioner is operated, power consumption of the compressor is consumed at the engine output, and thus the output of the prime mover put into actual work is lowered, resulting in a decrease in work efficiency. That is, when controlling the operation of the compressor only by controlling the temperature of the evaporator without considering the load fluctuation as in the related art, there is a problem in that the work efficiency is lowered and the life of the prime mover is reduced by the overload.

본 발명은 상기와 같은 문제점을 해소하기 위하여 안출된 것으로, 에어컨을 가동시키면서 작업을 행할 경우 부하의 상태를 고려하여 컴프레셔의 작동을 제어하기 위한 에어컨 시스템의 컴프레셔 제어방법을 제공하는데 그 목적이 있다.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a compressor control method of an air conditioner system for controlling the operation of the compressor in consideration of the state of the load when the operation while operating the air conditioner.

상기와 같은 목적을 달성하기 위하여 본 발명의 방법은, 엔진 연료량 조절 레버의 각도에 따른 목표 엔진 회전수를 감지하는 목표 회전수 센서와 엔진의 실제 회전수를 감지하는 엔진 회전수 센서를 구비하여 목표 회전수와 엔진의 실제 회전수에 의해 컴프레셔의 작동을 제어하도록 된 컴프레셔 제어장치에 있어서, 상기 목표 회전수 센서로부터 감지된 목표 회전수와 상기 엔진 회전수 센서로부터 감지된 실제 회전수의 편차를 구하고, 상기 컴프레셔를 작동하기 위한 작동 기준편차와 상기 컴프레셔를 정지하기 위한 정지 기준편차를 다르게 설정하여 상기 감지된 편차가 상기 작동 기준편차보다 크면 상기 컴프레셔를 작동하게 제어하고, 상기 감지된 편차가 상기 정지 기준편차보다 작으면 상기 컴프레셔를 정지하게 제어하는 것을 특징으로 한다.In order to achieve the above object, the method of the present invention comprises a target speed sensor for detecting a target engine speed according to the angle of the engine fuel amount control lever and an engine speed sensor for detecting an actual speed of the engine. In the compressor control device to control the operation of the compressor by the rotational speed and the actual rotational speed of the engine, the deviation of the target rotational speed detected from the target rotational speed sensor and the actual rotational speed detected from the engine rotational speed sensor Differently setting an operation reference deviation for operating the compressor and a stop reference deviation for stopping the compressor to control the compressor to operate when the detected deviation is greater than the operating reference deviation, and the detected deviation is the stop. If it is smaller than the reference deviation, the compressor is controlled to stop.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 자세히 설명하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 컴프레셔 제어장치를 도시한 블록도로서, 조작 스위 치(21), 목표 회전수센서(22), 엔진 회전수센서(23), 증발기 온도센서(24), 에어컨 컴프레셔(26)가 에어컨 제어장치(25)와 연결되어 있다. 도 2에서 조작 스위치(21)는 에어컨의 동작을 온시키기 위한 온/오프 스위치이고, 목표 회전수 센서(22)는 엔진 분사펌프의 연료조절 레버(트로틀 레버)의 설정 위치를 검출하여 목표회전수에 대한 값을 감지하도록 되어 있다. 엔진 회전수 센서(23)는 엔코더 등과 같이 회전을 감지하기 위한 센서로 구현되어 엔진의 실제 회전수에 대응하는 신호를 검출하고, 증발기 온도센서(24)는 증발기의 결빙을 방지하기 위하여 증발기의 온도를 감지하는 센서이다. 에어콘 제어장치(25)는 조작스위치(21)와 목표 회전수센서(22), 엔진회전수센서(23), 증발기 온도센서(24)로부터 입력되는 신호들을 처리하여 에어컨 컴프레셔(26)의 동작을 제어한다.Figure 2 is a block diagram showing a compressor control device according to the present invention, the operation switch 21, the target speed sensor 22, the engine speed sensor 23, the evaporator temperature sensor 24, the air conditioner compressor ( 26 is connected to the air conditioner control device 25. In FIG. 2, the operation switch 21 is an on / off switch for turning on the operation of the air conditioner, and the target rotation speed sensor 22 detects the set position of the fuel control lever (throttle lever) of the engine injection pump to detect the target rotation speed. It is intended to detect the value for. The engine speed sensor 23 is implemented as a sensor for detecting rotation, such as an encoder, to detect a signal corresponding to the actual speed of the engine, and the evaporator temperature sensor 24 measures the temperature of the evaporator to prevent freezing of the evaporator. It is a sensor to detect. The air conditioner controller 25 processes the signals input from the operation switch 21, the target rotation speed sensor 22, the engine speed sensor 23, and the evaporator temperature sensor 24 to control the operation of the air conditioner compressor 26. To control.

도 3은 본 발명에 따른 컴프레셔 제어장치의 세부 블록도로서, 이 장치는 조작 스위치(21), 증발기 온도센서(24), 목표 회전수 센서(22), 엔진 회전수 센서(23), 제1 비교기(31), 제2 비교기(32), 앤드게이트(33), 컴프레셔 구동회로(34), 컴프레셔 마그네트 클러치(35)를 포함하고 있다.3 is a detailed block diagram of a compressor control device according to the present invention, which includes an operation switch 21, an evaporator temperature sensor 24, a target rotation speed sensor 22, an engine rotation speed sensor 23, and a first The comparator 31, the second comparator 32, the end gate 33, the compressor drive circuit 34, and the compressor magnet clutch 35 are included.

도 1에서 제1 비교기(31)는 증발기 온도센서(24)가 감지한 온도신호를 증발기의 결빙을 방지하기 위한 기준온도에 해당하는 기준값(Vth1)과 비교하여 감지된 온도신호가 기준값(Vth1)보다 크면 컴프레셔(26)를 동작시키기 위한 하이신호를 출력하고, 반대이면 로우신호를 출력한다. 제2 비교기(32)는 엔진 회전수 센서(23)가 실제 엔진의 회전수를 감지한 감지신호를 목표 회전수 센서(22)가 감지한 기준값(Vth2)과 비교하여 엔진 회전수값이 기준값(Vth2)보다 크면(즉, 실제 엔진회 전수가 목표 회전수보다 크면) 컴프레셔(26)를 동작시키기 위한 하이신호를 출력하고, 반대이면 로우신호를 출력한다. 즉, 엔진의 부하가 커지면 실제 회전수가 저하되므로 감지된 회전수가 목표 회전수보다 작아지면 과부하로 판정하여 컴프레셔(26)를 오프하도록 한다. 이와 같이 컴프레셔(26)가 오프되면 엔진에 부가되는 부하량이 그만큼 줄어들어 과부하를 방지할 수 있다. 이때 본 발명에서는 컴프레셔의 작동과 정지를 결정하는 회전수 편차(즉, 미리 설정된 목표회전수와 실제 회전수의 차)를 결정함에 있어서 작동점을 위한 기준값과 정지점을 위한 기준값을 다르게 하여 히스테리시스 특성을 갖게 함으로써 작동과 정지의 경계점에서 불안정을 방지할 수 있다.In FIG. 1, the first comparator 31 compares a temperature signal detected by the evaporator temperature sensor 24 with a reference value Vth1 corresponding to a reference temperature for preventing freezing of the evaporator, and the detected temperature signal is a reference value Vth1. If larger, a high signal for operating the compressor 26 is output; otherwise, a low signal is output. The second comparator 32 compares the detection signal at which the engine speed sensor 23 detects the actual speed of the engine with the reference value Vth2 detected by the target speed sensor 22 to determine the engine speed value as the reference value Vth2. If greater than (i.e., if the actual engine speed is greater than the target rotational speed), a high signal for operating the compressor 26 is output, and a low signal is outputted. That is, since the actual rotation speed decreases as the load of the engine becomes large, if the detected rotation speed becomes smaller than the target rotation speed, the compressor 26 is turned off by determining that it is an overload. In this way, when the compressor 26 is turned off, the load added to the engine is reduced by that much, thereby preventing overload. In the present invention, the hysteresis characteristics are determined by varying the reference value for the operating point and the reference value for the stop point in determining the rotation speed deviation (that is, the difference between the preset target rotation speed and the actual rotation speed) for determining the operation and stop of the compressor. This can prevent instability at the boundary between start and stop.

앤드게이트(33)는 조작 스위치값과 제1 비교기(31)의 출력 및 제2 비교기(32)의 출력에 따라 컴프레셔 구동회로(34)를 제어하고, 컴프레셔 구동회로(34)는 앤드게이트(33)의 출력에 따라 컴프레셔 마그네트 클러치(35)를 구동하기 위한 구동신호를 출력한다. 그리고 컴프레셔 마그네트 클러치(35)는 온되면 컴프레셔(26)를 엔진에 연결하여 컴프레셔가 작동되게 하고, 오프되면 컴프레셔를 엔진과 분리하여 컴프레셔가 작동되지 않게 한다.The AND gate 33 controls the compressor driving circuit 34 according to the operation switch value, the output of the first comparator 31, and the output of the second comparator 32, and the compressor driving circuit 34 controls the AND gate 33. A driving signal for driving the compressor magnet clutch 35 is output according to the output of When the compressor magnet clutch 35 is turned on, the compressor 26 is connected to the engine to operate the compressor. When the compressor magnet clutch 35 is turned off, the compressor is separated from the engine so that the compressor is not operated.

이어서, 상기와 같이 구성되는 본 발명의 동작을 설명하면 다음과 같다.Next, the operation of the present invention configured as described above is as follows.

에어컨 조작 스위치(21)가 동작 위치로 설정되어 있는 경우 컴프레셔의 마그네트 클러치(35)는 증발기 온도센서(24)로부터 감지된 온도신호가 미리 설정된 결빙온도 이상인 상태에서 엔진의 실제 회전수가 목표 회전수보다 높은 경우 컴프레셔의 마그네트 클러치(35)에 전압을 인가하여 컴프레셔(26)를 작동시킨다. 엔진의 실제 회전수가 목표 회전수보다 낮은 경우, 컴프레셔의 마그네트 클러치(35)에 인가되는 전압을 차단하여 컴프레셔(26)의 압축작용을 정지시킨다. 이상의 작용을 연속적으로 행하므로 엔진의 출력을 효율적으로 작업 부하에 활용하고, 엔진의 과부하를 방지할 수 있다. When the air conditioner operation switch 21 is set to the operating position, the magnet clutch 35 of the compressor has the actual rotation speed of the engine higher than the target rotation speed in a state in which the temperature signal detected from the evaporator temperature sensor 24 is equal to or higher than a preset freezing temperature. When high, the compressor 26 is operated by applying a voltage to the compressor's magnet clutch 35. When the actual rotational speed of the engine is lower than the target rotational speed, the voltage applied to the magnet clutch 35 of the compressor is cut off to stop the compression operation of the compressor 26. Since the above operation is performed continuously, the output of the engine can be efficiently utilized for the workload, and the overload of the engine can be prevented.

에어컨 조작 스위치(21)가 정지위치로 설정되거나 증발기의 온도가 미리 설정된 결빙 온도보다 낮을 경우는 컴프레셔의 마그네트 클러치(35)의 전압을 차단하여 컴프레셔(26)의 압축작용을 정지시킨다.When the air conditioner operation switch 21 is set to the stop position or the temperature of the evaporator is lower than the preset freezing temperature, the voltage of the magnet clutch 35 of the compressor is cut off to stop the compression operation of the compressor 26.

이상에서 설명한 바와 같이, 본 발명에 따르면 에어컨을 가동하면서 작업을 행할 경우 엔진의 목표 회전수보다 실제 회전수가 낮으면 엔진 부하가 큰 것으로 판정하여 컴프레셔의 가동을 중단시키므로써 엔진의 출력을 작업 부하에 효과적으로 이용하게 하여 작업 효율을 높이고, 엔진의 과부하를 방지하므로써 수명을 연장하는 효과가 있다. 특히, 본 발명에서는 컴프레셔의 작동과 정지를 결정하는 회전수 편차를 결정함에 있어서 작동점을 위한 기준값과 정지점을 위한 기준값을 다르게 하여 히스테리시스 특성을 갖게 함으로써 작동과 정지의 경계점에서 불안정을 방지할 수 있다. As described above, according to the present invention, when performing the operation while operating the air conditioner, if the actual rotational speed is lower than the target rotational speed of the engine, it is determined that the engine load is large and the operation of the compressor is stopped by stopping the operation of the compressor. Effective use has the effect of increasing the working efficiency and preventing the overload of the engine, thereby extending the service life. Particularly, in the present invention, in determining the deviation of revolutions for determining the operation and stop of the compressor, the reference value for the operating point and the reference value for the stop point are different to have hysteresis characteristics, thereby preventing instability at the boundary between the operation and the stop. have.

Claims (2)

조작스위치(21), 목표 회전수센서(22), 엔진 회전수센서(23), 증발기 온도센서(24), 에어컨 컴프레셔(26)가 에어컨 제어장치(25)와 연결되어 있고, 상기 에어컨 제어장치(25)는 엔진 연료량 조절 레버의 각도에 따라 상기 목표 회전수 센서(22)가 감지하는 목표 엔진 회전수와, 상기 엔진 회전수 센서(23)가 감지하는 엔진의 실제 회전수에 따라 상기 컴프레셔(26)의 작동을 제어하는 건설 중장비 에어컨 시스템의 컴프레셔 제어방법에 있어서,The operation switch 21, the target speed sensor 22, the engine speed sensor 23, the evaporator temperature sensor 24, the air conditioner compressor 26 are connected to the air conditioner control device 25, the air conditioner control device Reference numeral 25 denotes the compressor according to the target engine speed detected by the target rotation speed sensor 22 and the actual rotation speed of the engine detected by the engine speed sensor 23 according to the angle of the engine fuel amount adjustment lever. In the compressor control method of the construction heavy equipment air conditioning system to control the operation of 26), 상기 목표 회전수 센서(22)로부터 감지된 목표 엔진 회전수와 상기 엔진 회전수 센서(23)로부터 감지된 엔진의 실제 회전수의 편차를 구하고,The deviation between the target engine speed detected by the target speed sensor 22 and the actual speed of the engine detected by the engine speed sensor 23 is obtained. 상기 컴프레셔(26)를 작동하기 위한 작동 기준편차와 상기 컴프레셔(26)를 정지하기 위한 정지 기준편차를 다르게 설정하여 상기 목표 엔진 회전수 편차와 엔진의 실제 회전수의 편차가 상기 작동 기준편차보다 크면 상기 컴프레셔(26)를 작동하게 제어하고,If the operating reference deviation for operating the compressor 26 and the stop reference deviation for stopping the compressor 26 are set differently so that the deviation between the target engine speed deviation and the actual rotation speed of the engine is greater than the operating reference deviation. To operate the compressor 26, 상기 목표 엔진 회전수 편차와 엔진의 실제 회전수의 편차가 상기 정지 기준편차보다 작으면 상기 컴프레셔(26)를 정지하게 제어하는 것을 특징으로 하는 건설 중장비 에어컨 시스템의 컴프레셔 제어방법.And controlling the compressor (26) to stop when the deviation between the target engine speed deviation and the actual engine speed is smaller than the stop reference deviation. 제1항에 있어서,The method of claim 1, 증발기 온도센서(24)가 검출하는 증발기의 온도가 미리 설정된 온도 이하일 경우에 상기 컴프레셔의 작동을 정지하도록 제어하는 것을 더 포함하는 것을 특징으로 하는 건설 중장비 에어컨 시스템의 컴프레셔 제어방법.And controlling to stop the operation of the compressor when the temperature of the evaporator detected by the evaporator temperature sensor is less than or equal to a predetermined temperature.
KR1019990060137A 1999-12-22 1999-12-22 Compressor Control Method of Construction Heavy Equipment Air Conditioning System Expired - Fee Related KR100618243B1 (en)

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