KR20200040972A - Method for controlled cooling system of vehicles - Google Patents

Method for controlled cooling system of vehicles Download PDF

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KR20200040972A
KR20200040972A KR1020180120669A KR20180120669A KR20200040972A KR 20200040972 A KR20200040972 A KR 20200040972A KR 1020180120669 A KR1020180120669 A KR 1020180120669A KR 20180120669 A KR20180120669 A KR 20180120669A KR 20200040972 A KR20200040972 A KR 20200040972A
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South Korea
Prior art keywords
cooling water
water temperature
vehicle
target cooling
engine
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KR1020180120669A
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Korean (ko)
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KR102132030B1 (en
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이수호
최의철
박준식
송오영
권민영
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현대자동차주식회사
기아자동차주식회사
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Priority to KR1020180120669A priority Critical patent/KR102132030B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/022—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
    • F02N2200/0801—Vehicle speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The present invention relates to technology for ensuring power performance by controlling a target cooling water temperature to be lowered in advance when a vehicle is stopped. According to the present invention, disclosed is a method for controlling a cooling system for a vehicle, which comprises the steps of: determining engine operation conditions based on a vehicle speed and an engine RPM; determining whether an ISG function works; setting a target cooling water temperature to be lower than a preset target cooling water temperature when it is determined that the engine operation conditions are low load operation conditions and the ISG function does not work; and controlling a cooling water temperature to follow the target cooling water temperature set to be dropped.

Description

차량용 냉각시스템 제어방법{METHOD FOR CONTROLLED COOLING SYSTEM OF VEHICLES}Vehicle cooling system control method {METHOD FOR CONTROLLED COOLING SYSTEM OF VEHICLES}

본 발명은 차량의 정차 상태에서 목표 냉각수온을 미리 낮추도록 제어하여 동력성능을 확보하도록 한 차량용 냉각시스템 제어방법에 관한 것이다.The present invention relates to a method for controlling a cooling system for a vehicle to secure a power performance by controlling a target cooling water temperature to be lowered in advance in a vehicle stopped state.

차량의 시동 초기 냉간 조건에서 엔진은 충분히 웜업된 조건 대비 연비가 좋지 않다. 그 이유는, 냉간시 오일 온도가 낮은 상태에서 오일의 높은 점도로 인해 엔진의 마찰이 크고, 또한 실린더 벽면의 온도가 낮아 벽면으로의 열손실이 크며, 연소 안정성이 떨어지기 때문이다.In the cold condition at the beginning of the start of the vehicle, the engine has poor fuel efficiency compared to a sufficiently warmed-up condition. The reason is that the engine friction is high due to the high viscosity of the oil while the oil temperature is low during cold, and the temperature of the cylinder wall is low, so that heat loss to the wall is large and combustion stability is poor.

따라서, 차량의 연비 향상 및 엔진 내구성 향상을 위해서는 시동 초기에 엔진의 온도를 정상 온도로 빠르게 승온시켜주는 것이 필요하다.Therefore, in order to improve the fuel efficiency of the vehicle and improve the engine durability, it is necessary to rapidly increase the temperature of the engine to a normal temperature at the beginning of starting.

이를 위해, 차량의 냉간 시동시, 엔진에서 발생하는 열을 최대한 엔진을 웜업하는데 이용함으로써, 연비와 출력을 향상하면서, 배출가스 저감 효과를 얻도록 하는 기술이 다양하게 제안되고 있으며, 대표적으로 유동정지밸브, 클러치 타입 워터펌프, 전동식 워터펌프, 통합유량제어밸브 등을 들 수 있다.To this end, various techniques have been proposed to obtain a gas emission reduction effect while improving fuel efficiency and output by using the heat generated from the engine to warm up the engine as much as possible during cold start of the vehicle. Valves, clutch-type water pumps, electric water pumps, and integrated flow control valves.

이 중, 통합유량제어밸브는 엔진 내에 냉각수를 단순 정지하는 제어 뿐만 아니라 냉각수의 유량을 미소하게 가변하여 제어함으로써, 오일 워머 혹은 ATF 워머 등에 승온된 냉각수를 우선 공급하게 되고, 이에 엔진 오일과 변속기 오일, 그리고 엔진 전체의 온도를 동시에 빠르게 승온할 수 있어 최적의 신속한 엔진 웜업을 구사할 수가 있다.Among them, the integrated flow control valve not only provides a simple stop control of the cooling water in the engine, but also controls the flow rate of the cooling water to be minutely variable, thereby supplying the warmed water to the oil warmer or ATF warmer first, and thus the engine oil and the transmission oil And, since the temperature of the entire engine can be rapidly heated at the same time, it is possible to use the optimum rapid engine warm-up.

한편, 차량의 냉각수 온도가 목표 냉각수온을 추종하도록 제어하게 되고, 상기 목표 냉각수온은 엔진회전수와 엔진부하 테이블에 의해 조절이 가능할 수 있다.Meanwhile, the cooling water temperature of the vehicle is controlled to follow the target cooling water temperature, and the target cooling water temperature may be adjustable by an engine speed and an engine load table.

예컨대, 엔진회전수가 낮은 저RPM 운전영역보다 상대적으로 높은 고RPM 운전영역에서 목표 냉각수온이 낮아지도록 조절이 되고, 이를 통해 연료소모량을 줄이게 되어 연비향상에 기여하게 된다.For example, the target cooling water temperature is adjusted to be lower in the high RPM operating region, which is relatively higher than the low RPM operating region, where the engine speed is low, thereby reducing fuel consumption and contributing to fuel efficiency improvement.

그런데, 차량이 정차되어 있는 상태에서 출발하는 경우, 엔진회전수가 급격하게 상승하여 고RPM 운전영역으로 진입하게 되면 목표 냉각수온이 낮아지게 되는데, 냉각수온센서에서 측정되는 냉각수온이 목표 냉각수온에 도달하기까지는 수 초 이상의 시간이 소요된다. However, when the vehicle starts while the vehicle is stopped, when the engine speed rises rapidly and enters the high RPM operating area, the target cooling water temperature decreases. The cooling water temperature measured by the cooling water temperature sensor reaches the target cooling water temperature. It takes more than a few seconds.

즉, 차량이 출발하여 고RPM운전영역에서 진입하게 되더라도, 냉각수온은 여전히 목표 냉각수온에 도달하지 못하고 상대적으로 높은 냉각수온에서 운전이 되는바, 냉각수온이 목표 냉각수온에 도달하기까지의 시간만큼 연료소모량이 더 증가하게 되고, 이는 출력 손실로 이어져 차량의 동력성능평가시, 동력성능이 떨어지는 결과를 초래하는 문제가 있었다.That is, even if the vehicle starts and enters the high RPM driving area, the cooling water temperature still does not reach the target cooling water temperature and is operated at a relatively high cooling water temperature, as long as the cooling water temperature reaches the target cooling water temperature. There was a problem in that the fuel consumption increased further, leading to output loss, resulting in a decrease in power performance when evaluating the power performance of the vehicle.

상기의 배경기술로서 설명된 사항들은 본 발명의 배경에 대한 이해 증진을 위한 것일 뿐, 이 기술분야에서 통상의 지식을 가진 자에게 이미 알려진 종래기술에 해당함을 인정하는 것으로 받아들여져서는 안 될 것이다.The above descriptions as background arts are only for improving understanding of the background of the present invention, and should not be taken as an admission that they correspond to the prior arts already known to those skilled in the art.

JP 2004-137981 AJP 2004-137981 A

본 발명은 전술한 바와 같은 문제점을 해결하기 위하여 안출한 것으로, 차량의 정차 상태에서 목표 냉각수온을 미리 낮추도록 제어하여 동력성능을 확보하도록 한 차량용 냉각시스템 제어방법을 제공하는 데 있다.The present invention has been made to solve the above-described problems, and to provide a method for controlling a cooling system for a vehicle to secure power performance by controlling the target cooling water temperature to be lowered in advance in a vehicle stop.

상기와 같은 목적을 달성하기 위한 본 발명의 구성은, 컨트롤러가 차속 및 엔진회전수를 기반으로 엔진운전조건을 판단하는 단계; 컨트롤러가 ISG(Idle Stop & Go)기능이 작동하는지 판단하는 단계; 컨트롤러가 상기 엔진운전조건이 저부하운전조건이고, 상기 ISG기능이 작동하지 않는 상태로 판단되면, 목표 냉각수온을 기설정된 목표 냉각수온보다 하강하여 설정하는 단계; 및 컨트롤러가 상기 하강 설정된 목표 냉각수온을 추종하도록 냉각수온을 제어하는 단계;를 포함하는 것을 특징으로 할 수 있다.The configuration of the present invention for achieving the above object, the controller determining the engine operating conditions based on the vehicle speed and engine speed; The controller determines whether the ISG (Idle Stop & Go) function works; If the controller determines that the engine operation condition is a low load operation condition and the ISG function does not operate, setting a target cooling water temperature by lowering than a preset target cooling water temperature; And a controller controlling the cooling water temperature to follow the set target cooling water temperature.

상기 저부하운전조건은 상기 차속이 O이고, 엔진회전수가 특정회전수 이하일 수 있다.In the low load operation condition, the vehicle speed may be O and the engine speed may be less than or equal to a specific speed.

상기 특정회전수는 아이들회전수일 수 있다.The specific rotation speed may be an idle rotation speed.

상기 하강 설정된 목표 냉각수온은 흡기온도와 외기온도의 관계로 결정될 수 있다.The target cooling water temperature set for the descent may be determined by the relationship between the intake air temperature and the outside air temperature.

상기 목표 냉각수온의 하강변화량은 흡기온도와 외기온도에 비례할 수 있다.The downward change amount of the target cooling water temperature may be proportional to the intake air temperature and the outside air temperature.

상기 목표 냉각수온을 기설정된 목표 냉각수온보다 낮게 설정한 후에, 상기 엔진운전조건이 저부하운전조건을 벗어나는지 판단하는 단계; 상기 엔진운전조건이 저부하운전조건을 벗어나는 경우, 목표 냉각수온을 기설정된 목표 냉각수온으로 복원하는 단계;를 포함할 수 있다.After setting the target cooling water temperature lower than a preset target cooling water temperature, determining whether the engine operating condition is out of a low load operating condition; And restoring the target cooling water temperature to a predetermined target cooling water temperature when the engine operating condition is out of the low load operating condition.

상기한 과제 해결수단을 통해 본 발명은, ISG기능이 오프되고, 차량이 정차한 경우에, 목표 냉각수온을 낮추도록 제어함으로써, 차량 발진에 따른 고부하운전조건에서 차량의 냉각수온을 낮추게 되는바, 연료소모량을 줄여 차량의 동력성능을 확보하는 효과가 있다.The present invention through the above-described problem solving means, when the ISG function is turned off and the vehicle is stopped, by controlling the target cooling water temperature to be lowered, the cooling water temperature of the vehicle is lowered in a high load driving condition according to vehicle launch. It is effective in securing the power performance of the vehicle by reducing the fuel consumption.

도 1은 본 발명에 적용 가능한 냉각시스템 구성의 실시예를 도시한 도면.
도 2는 본 발명에 따른 냉각시스템 제어방법을 나타낸 흐름도.
도 3은 본 발명에서 목표 냉각수온을 결정하는 흡기온도와 외기온도 테이블을 예시한 도면.
도 4는 저부하운전조건 및 고부하운전조건에서 냉각수온에 따른 연료소모율을 비교하여 나타낸 도면.
도 5는 본 발명에 적용 가능한 냉각시스템 구성의 다른 실시예를 도시한 도면.1 is a view showing an embodiment of a cooling system configuration applicable to the present invention.
Figure 2 is a flow chart showing a cooling system control method according to the present invention.
3 is a diagram illustrating an intake air temperature and an outside air temperature table for determining a target cooling water temperature in the present invention.
4 is a view showing a comparison of the fuel consumption rate according to the cooling water temperature in the low load operation condition and high load operation condition.
5 is a view showing another embodiment of a cooling system configuration applicable to the present invention.

본 발명의 바람직한 실시예를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.If described in detail by the accompanying drawings, preferred embodiments of the present invention.

도 1은 본 발명에 적용 가능한 차량용 냉각시스템의 구성을 간략하게 예시한 도면으로, 엔진(20)의 입구측 유로 상에 엔진입구수온센서(WTS2)가 설치되고, 엔진 실린더헤드의 출구측 유로 상에 헤드출구수온센서(WTS1)가 설치되며, 엔진 블록의 출구측 유로 상에 블록출구수온센서(WTS3)가 설치된다.1 is a view briefly illustrating the configuration of a vehicle cooling system applicable to the present invention, an engine inlet water temperature sensor WTS2 is installed on an inlet channel of the engine 20, and on an outlet channel of an engine cylinder head A head outlet water temperature sensor (WTS1) is installed, and a block outlet water temperature sensor (WTS3) is installed on the outlet passage of the engine block.

그리고, 상기 헤드출구수온센서(WTS1)의 후단에 통합유량제어밸브(이하, '유량제어밸브'로 칭함)(10)가 설치된다. 이러한, 유량제어밸브(10)에는 다수의 포트가 마련되는데, 상기 유량제어밸브(10) 내부에 구비된 밸브바디의 회전 작동을 통해 각 포트의 개도량을 한 번에 가변 제어하게 되고, 이에 각 포트를 통해 유동되는 냉각수 유동량을 조절할 수 있게 된다.In addition, an integrated flow control valve (hereinafter referred to as “flow control valve”) 10 is installed at the rear end of the head outlet water temperature sensor WTS1. The flow control valve 10 is provided with a plurality of ports, and the opening amount of each port is variably controlled at a time through the rotational operation of the valve body provided inside the flow control valve 10. It is possible to control the amount of cooling water flowing through the port.

예컨대, 상기 유량제어밸브(10)에는 적어도 3개 이상의 토출포트가 각각 마련될 수 있고, 상기 각 토출포트는 라디에이터(30)와, 오일쿨러(40) 등의 오일열교환기와, 히터코어(50)가 배치된 유로에 각각 연결이 된다.For example, at least three or more discharge ports may be provided on the flow control valve 10, and each discharge port may include an oil heat exchanger such as a radiator 30, an oil cooler 40, and a heater core 50. Are respectively connected to the flow paths.

특히, 라디에이터(30)가 배치된 유로에 연결된 토출포트(11)와, 히터코어(50)가 배치된 유로에 연결되는 토출포트(12)는, 상기 유량제어밸브(10)의 작동에 의해 그 개도량이 조절되어 상기 유로들에 공급되는 냉각수의 유량을 조절할 수 있다.Particularly, the discharge port 11 connected to the flow path in which the radiator 30 is disposed and the discharge port 12 connected to the flow path in which the heater core 50 is disposed are controlled by the operation of the flow control valve 10. The opening amount can be adjusted to control the flow rate of cooling water supplied to the flow paths.

아울러, 상기 엔진(20) 실린더블록의 냉각수출구와, 실린더헤드의 냉각수출구가 상기 유량제어밸브(10)에 각각 독립적으로 연결이 되고, 이때에 상기 유량제어밸브(10)와 실린더헤드의 냉각수출구는 상시 개방된 상태로 연결이 된다.In addition, the cooling outlet of the cylinder block of the engine 20 and the cooling outlet of the cylinder head are independently connected to the flow control valve 10, and at this time, the flow control valve 10 and the cooling outlet of the cylinder head Is always open.

다만, 상기 실린더블록의 냉각수출구와 연결되는 유량제어밸브(10)에는 블록포트(13)가 마련되고, 상기 블록포트(13)는 상기 유량제어밸브(10)의 작동에 의해 그 개도량이 조절되어, 실린더블록에서 유량제어밸브(10)에 토출되는 냉각수의 유량을 조절할 수 있게 구성이 된다. However, a block port 13 is provided in the flow control valve 10 connected to the cooling outlet of the cylinder block, and the opening amount of the block port 13 is adjusted by the operation of the flow control valve 10. , It is configured to adjust the flow rate of the cooling water discharged from the cylinder block to the flow control valve (10).

한편, 본 발명에 따른 차량용 냉각시스템을 제어하는 방법으로, 특정 운전조건에서 목표 냉각수온을 미리 낮추도록 제어할 수 있다.On the other hand, as a method of controlling a vehicle cooling system according to the present invention, it can be controlled to lower the target cooling water temperature in advance under a specific driving condition.

도 2를 참조하여 설명하면, 본 발명은 컨트롤러(C)가 차속 및 엔진회전수를 기반으로 엔진운전조건을 판단하는 단계와, 컨트롤러(C)가 ISG(Idle Stop & Go)기능이 작동하는지 판단하는 단계와, 컨트롤러(C)가 상기 엔진운전조건이 저부하운전조건이고, 상기 ISG기능이 작동하지 않는 상태로 판단되면, 목표 냉각수온을 기설정된 목표 냉각수온보다 하강하여 설정하는 단계 및, 컨트롤러(C)가 상기 하강 설정된 목표 냉각수온을 추종하도록 제어하는 단계를 포함하여 구성이 된다.Referring to Figure 2, the present invention is the controller (C) determining the engine operating conditions based on the vehicle speed and engine speed, and the controller (C) determines whether the ISG (Idle Stop & Go) function works When the engine operation condition is a low load operation condition, and the controller C determines that the ISG function is not in operation, setting the target cooling water temperature by lowering it than a preset target cooling water temperature, and the controller. (C) is configured to include the step of controlling to follow the target cooling water temperature is set to fall.

여기서, ISG기능이 작동하지 않는 상태로는, 바람직하게는 차량에 ISG기능이 탑재되어 있으나 사용자에 의해 ISG기능이 오프된 상태일 수 있고, 또는 차량에 ISG기능이 탑재되어 있지 않아 ISG기능을 작동할 수 없는 상태일 수도 있을 것이다.Here, in a state in which the ISG function is not operated, the ISG function is preferably installed in the vehicle, but the ISG function may be turned off by the user, or the ISG function is activated because the vehicle is not equipped with the ISG function. It may be in a state that cannot be done.

그리고, 상기 차속이 0이고, 엔진회전수가 특정회전수 이하인 경우 저부하운전조건을 만족하는 것으로 판단할 수 있다. 이때에, 상기 특정회전수는 아이들회전수일 수 있다.In addition, when the vehicle speed is 0 and the engine speed is equal to or less than the specified speed, it may be determined that the low load operation condition is satisfied. At this time, the specific rotation speed may be an idle rotation speed.

즉, 도 4에 도시한 바와 같이, 엔진회전수가 상대적으로 낮거나 저속으로 주행하는 경우에는 냉각수온이 높을수록 연료소모량이 적으나, 반대로 엔진회전수가 상대적으로 높거나 고속으로 주행하는 경우, 또는 급가속시에는 냉각수온이 낮을수록 연료소모량이 적다. That is, as shown in FIG. 4, when the engine speed is relatively low or when the vehicle is traveling at a low speed, the fuel consumption is smaller as the cooling water temperature is higher, but when the engine speed is relatively high or when the engine speed is high, During acceleration, the lower the cooling water temperature, the less fuel consumption.

이에, 차량의 발진시에는 순간적으로 엔진회전수가 상승하는 고부하 운전조건에 진입하기 때문에 냉각수온이 낮을수록 연비가 좋고, 노킹 발생을 억제하게 된다.Accordingly, when the vehicle starts, the engine speed is instantaneously entered into a high-load driving condition, so the lower the cooling water temperature is, the better the fuel economy is, and knocking is suppressed.

이 같은 원리에 의해, 본 발명에서는 ISG기능이 오프되고, 차량이 정차되어 엔진아이들 상태로 운전이 되는 경우에, 목표 냉각수온을 낮추도록 제어함으로써, 차량의 출발시점에서 냉각수온(3개의 수온센서 중 하나(ex : WTS2)에서 측정된 냉각수온)이 이미 목표 냉각수온에 상당히 수렴하고 있는 상태가 된다.By this principle, in the present invention, when the ISG function is turned off and the vehicle is stopped and operated in the engine idle state, by controlling the target cooling water temperature to be lowered, the cooling water temperature at the time of departure of the vehicle (3 water temperature sensors Either one (ex: cooling water temperature measured in WTS2) has already converged considerably to the target cooling water temperature.

따라서, 차량 발진과 함께 고부하운전조건에 진입한 시점에 차량의 냉각수온이 낮은 상태에 있으므로, 연료소모량을 줄이게 되어 차량의 동력성능을 확보할 수 있게 된다.Therefore, since the cooling water temperature of the vehicle is in a low state at the time of entering the high load driving condition with the vehicle starting, it is possible to reduce the fuel consumption and secure the power performance of the vehicle.

한편, 도 3과 같이 본 발명에서는 상기 하강 설정된 목표 냉각수온이 흡기온도와 외기온도의 관계로 결정될 수 있다.On the other hand, in the present invention, as shown in Figure 3, the target cooling water temperature set as the falling may be determined by the relationship between the intake air temperature and the outside air temperature.

그리고, 상기 목표 냉각수온의 하강변화량은 특정 온도범위 내에서 흡기온도와 외기온도에 비례하여 결정될 수 있다.And, the amount of change in the downward change of the target cooling water temperature may be determined in proportion to the intake air temperature and the outside air temperature within a specific temperature range.

예컨대, 외기온이 34℃, 흡기온도가 50℃인 경우 목표 냉각수온을 5℃ 낮추어 설정하고, 외기온이 35℃, 흡기온도가 60℃인 경우 목표 냉각수온을 10℃ 낮추어 설정할 수 있다.For example, when the ambient temperature is 34 ° C and the intake temperature is 50 ° C, the target cooling water temperature may be set by lowering by 5 ° C, and when the outside temperature is 35 ° C and the intake temperature is 60 ° C, the target cooling water temperature may be set by lowering by 10 ° C.

아울러, 도 2와 같이 본 발명에서는, 상기 목표 냉각수온을 기설정된 목표 냉각수온보다 낮게 설정한 후에, 상기 엔진운전조건이 저부하운전조건을 벗어나는지 판단하는 단계와, 상기 엔진운전조건이 저부하운전조건을 벗어나는 경우, 목표 냉각수온을 기설정된 목표 냉각수온으로 복원하는 단계를 포함하여 구성이 된다.In addition, in the present invention, as shown in Figure 2, after setting the target cooling water temperature lower than the predetermined target cooling water temperature, determining whether the engine operating conditions are out of the low load operating conditions, and the engine operating conditions are low load When out of the operating conditions, it comprises a step of restoring the target cooling water temperature to a predetermined target cooling water temperature.

예컨대, 상기 차속이 0 초과이고, 엔진회전수가 아이들회전수 초과인 경우 저부하운전조건을 벗어난 것으로 판단할 수 있다.For example, when the vehicle speed is greater than 0 and the engine speed is greater than the idle speed, it may be determined that it is out of a low load operation condition.

즉, 엔진회전수가 상승하여 차속이 0을 초과하게 되면, 하강 설정된 목표 냉각수온의 설정이 해제되고, 기존에 설정된 목표 냉각수온으로 설정이 복귀된다. 이때에, 기존의 목표 냉각수온은 엔진회전수와 엔진부하의 관계로 설정이 될 수 있다.That is, when the engine speed rises and the vehicle speed exceeds 0, the setting of the target cooling water temperature set for falling is canceled, and the setting is returned to the previously set target cooling water temperature. At this time, the existing target cooling water temperature may be set in relation to the engine speed and the engine load.

한편, 도 1 및 도 2를 참조하여 본 발명에 따른 냉각시스템의 제어과정을 설명하면, 먼저 차속이 0인지 판단하여 차량의 정차상태를 판단하고(S10), 차속이 0인 경우 엔진회전수가 아이들회전수인지 판단한다(S20).On the other hand, referring to Figures 1 and 2 to describe the control process of the cooling system according to the present invention, first determine whether the vehicle speed is 0 to determine the vehicle's stopping state (S10), and the engine speed is idle when the vehicle speed is 0. It is determined whether the rotation speed (S20).

S20단계의 판단 결과, 엔진회전수가 아이들회전수인 경우, ISG기능이 오프되는지 판단하고(S30), ISG기능 오프시, 흡기온도와 외기온도의 테이블을 이용하여 목표 냉각수온을 하강 설정하여, 동력성능확보모드에 진입한다(S40).As a result of the determination in step S20, when the engine speed is the idle speed, it is determined whether the ISG function is turned off (S30), and when the ISG function is turned off, the target cooling water temperature is set downward using the table of intake air temperature and outside air temperature, and Enter the performance securing mode (S40).

이때에, 냉각수온이 목표 냉각수온보다 낮은 특정온도(75℃)를 초과하는지 판단하게 되고(S50), 판단 결과 냉각수온이 상기 특정온도를 초과하는 경우에 동력성능확보모드에 진입하도록 제어할 수 있다.At this time, it is determined whether the cooling water temperature exceeds a specific temperature (75 ° C) lower than the target cooling water temperature (S50), and as a result of the determination, when the cooling water temperature exceeds the specific temperature, it can be controlled to enter the power performance securing mode. have.

이에, 동력성능확보모드에 진입하면, 냉각수온을 목표 냉각수온까지 낮추기 위해 전동식 워터펌프를 작동하고, 유량제어밸브를 작동하여 라디에이터(30)가 연결된 유로의 포트를 개방하며, 냉각팬을 작동하도록 제어할 수 있다.Accordingly, when entering the power performance securing mode, the electric water pump is operated to lower the cooling water temperature to the target cooling water temperature, the flow control valve is operated to open the port of the flow path to which the radiator 30 is connected, and to operate the cooling fan. Can be controlled.

이 후, 차량이 발진하여, 차속이 0을 초과하면(S60), 하강 설정된 목표 냉각수온을 다시 기존에 설정된 목표 냉각수온으로 상승 설정하여, 동력성능확보모드를 해제하게 된다(S70).Thereafter, when the vehicle starts and the vehicle speed exceeds 0 (S60), the set target cooling water temperature, which is set to fall, is raised to the previously set target cooling water temperature, and the power performance securing mode is released (S70).

아울러, 도 5에 도시된 냉각시스템은 유량제어밸브가 없이, 전기식 써모스탯과, 블록 기계식 서모스탯 및 단유로 히터밸브가 조합된 구성으로, 이 같은 냉각시스템의 경우 동력성능확보모드에 진입하면, 냉각수온을 목표 냉각수온까지 낮추기 위해 전동식 워터펌프를 작동하고, 전기식 써모스탯을 개방하여 라디에이터(30) 측의 냉각수 유량을 증대시키며, 냉각팬을 작동하도록 제어할 수 있다.In addition, the cooling system shown in FIG. 5 is a combination of an electric thermostat, a block mechanical thermostat, and a heater heater valve without a flow control valve, and in the case of such a cooling system, when entering the power performance securing mode, In order to lower the cooling water temperature to the target cooling water temperature, the electric water pump is operated, the electric thermostat is opened to increase the flow rate of the cooling water at the radiator 30 side, and the cooling fan can be controlled to operate.

상술한 바와 같이, 본 발명은 ISG기능이 오프되고, 차량이 정차한 경우에, 목표 냉각수온을 낮추도록 제어함으로써, 차량 발진에 따른 운전조건에서 차량의 냉각수온을 낮추게 되는바, 연료소모량을 줄여 차량의 동력성능을 확보할 수 있게 된다.As described above, according to the present invention, when the ISG function is turned off and the vehicle is stopped, by controlling the target cooling water temperature to be lowered, the cooling water temperature of the vehicle is lowered in driving conditions according to the vehicle start, thereby reducing fuel consumption. It is possible to secure the power performance of the vehicle.

한편, 본 발명은 상기한 구체적인 예에 대해서만 상세히 설명되었지만 본 발명의 기술사상 범위 내에서 다양한 변형 및 수정이 가능함은 당업자에게 있어서 명백한 것이며, 이러한 변형 및 수정이 첨부된 특허청구범위에 속함은 당연한 것이다.On the other hand, the present invention has been described in detail only with respect to the specific examples described above, but it is apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and it is natural that such modifications and modifications belong to the appended claims. .

10 : 유량제어밸브
20 : 엔진
30 : 라디에이터
C : 컨트롤러
WTS1 : 헤드출구수온센서
WTS2 : 입구수온센서
WTS3 : 블록출구수온센서10: Flow control valve
20: engine
30: radiator
C: Controller
WTS1: Head outlet water temperature sensor
WTS2: Inlet water temperature sensor
WTS3: Block exit water temperature sensor

Claims (6)

컨트롤러가 차속 및 엔진회전수를 기반으로 엔진운전조건을 판단하는 단계;
컨트롤러가 ISG(Idle Stop & Go)기능이 작동하는지 판단하는 단계;
컨트롤러가 상기 엔진운전조건이 저부하운전조건이고, 상기 ISG기능이 작동하지 않는 상태로 판단되면, 목표 냉각수온을 기설정된 목표 냉각수온보다 하강하여 설정하는 단계; 및
컨트롤러가 상기 하강 설정된 목표 냉각수온을 추종하도록 냉각수온을 제어하는 단계;를 포함하는 차량용 냉각시스템 제어방법.The controller determines the engine operating conditions based on the vehicle speed and the engine speed;
The controller determines whether the ISG (Idle Stop & Go) function works;
When the controller is determined that the engine operation condition is a low load operation condition, and the ISG function is not operated, setting a target cooling water temperature by lowering than a preset target cooling water temperature; And
And controlling a cooling water temperature by a controller to follow the set target cooling water temperature. 청구항 1에 있어서,
상기 저부하운전조건은 상기 차속이 O이고, 엔진회전수가 특정회전수 이하인 것을 특징으로 하는 차량용 냉각시스템 제어방법.The method according to claim 1,
The low load operation condition is a vehicle cooling system control method, characterized in that the vehicle speed is O, and the engine speed is less than or equal to a specific speed. 청구항 2에 있어서,
상기 특정회전수는 아이들회전수인 것을 특징으로 하는 차량용 냉각시스템 제어방법.The method according to claim 2,
The specific rotation speed is a vehicle cooling system control method, characterized in that the idle speed. 청구항 1에 있어서,
상기 하강 설정된 목표 냉각수온은 흡기온도와 외기온도의 관계로 결정되는 것을 특징으로 하는 차량용 냉각시스템 제어방법.The method according to claim 1,
The method of controlling a cooling system for a vehicle, wherein the set target cooling water temperature is determined by a relationship between an intake air temperature and an outside air temperature. 청구항 4에 있어서,
상기 목표 냉각수온의 하강변화량은 흡기온도와 외기온도에 비례하는 것을 특징으로 하는 차량용 냉각시스템 제어방법.The method according to claim 4,
The method of controlling a cooling system for a vehicle, wherein the amount of change in the target cooling water temperature is proportional to the intake air temperature and the outside air temperature. 청구항 1에 있어서,
상기 목표 냉각수온을 기설정된 목표 냉각수온보다 낮게 설정한 후에, 상기 엔진운전조건이 저부하운전조건을 벗어나는지 판단하는 단계;
상기 엔진운전조건이 저부하운전조건을 벗어나는 경우, 목표 냉각수온을 기설정된 목표 냉각수온으로 복원하는 단계;를 포함하는 것을 특징으로 하는 차량용 냉각시스템 제어방법.The method according to claim 1,
After setting the target cooling water temperature lower than a preset target cooling water temperature, determining whether the engine operating condition is out of a low load operating condition;
And when the engine operating condition exceeds the low load operating condition, restoring a target cooling water temperature to a preset target cooling water temperature.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03111617A (en) * 1989-09-26 1991-05-13 Nissan Motor Co Ltd Cooling system for engine
JP2004137981A (en) 2002-10-18 2004-05-13 Nippon Thermostat Co Ltd Control method of electronically controlled thermostat

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03111617A (en) * 1989-09-26 1991-05-13 Nissan Motor Co Ltd Cooling system for engine
JP2004137981A (en) 2002-10-18 2004-05-13 Nippon Thermostat Co Ltd Control method of electronically controlled thermostat

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