JP2005090480A - Vehicle engine cooling system control device and its method - Google Patents

Vehicle engine cooling system control device and its method Download PDF

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JP2005090480A
JP2005090480A JP2003420225A JP2003420225A JP2005090480A JP 2005090480 A JP2005090480 A JP 2005090480A JP 2003420225 A JP2003420225 A JP 2003420225A JP 2003420225 A JP2003420225 A JP 2003420225A JP 2005090480 A JP2005090480 A JP 2005090480A
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engine
temperature
cooling water
cooling
cooling system
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Se-Yong Lee
世 ヨン 李
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Hyundai Motor Co
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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
    • 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
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • 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
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • 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
    • F01P2023/00—Signal processing; Details thereof
    • 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
    • F01P2025/32—Engine outcoming fluid temperature
    • 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
    • F01P2025/60—Operating parameters
    • F01P2025/62—Load
    • 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
    • F01P2025/60—Operating parameters
    • F01P2025/64—Number of revolutions
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/08—Cabin heater
    • 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
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle engine cooling system control device and its method for preventing the sensing instability of thermal shock and a cooling condition by optimally controlling the temperature of cooling water in accordance with the loaded conditions of an engine. <P>SOLUTION: The vehicle engine cooling system control device is provided for a vehicle engine cooling system in which cooling water pumped by a water pump is circulated passing through the engine and a radiator in sequence to cool the engine. It comprises an electronic valve means for adjusting the amount of the cooling water to be circulated through the radiator, a temperature sensing part for sensing the temperature of the cooling water passing through the engine, and a control part for controlling the valve opening/closing amount of the electronic valve means in accordance with the temperature of the cooling water sensed by the temperature sensing part and a target set temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は車両のエンジン冷却システム制御装置及び方法に関し、より詳しくは、冷却水温を最適に制御すると共に冷却系熱衝撃を防止することができる車両のエンジン冷却システム制御装置及び方法に関する。   The present invention relates to a vehicle engine cooling system control apparatus and method, and more particularly, to a vehicle engine cooling system control apparatus and method capable of optimally controlling a cooling water temperature and preventing a cooling system thermal shock.

一般に、車両用水冷式冷却システムは、エンジンの冷却水がウォータポンプから圧出されてエンジンのシリンダブロックとシリンダヘッドとを順番に経由しながらエンジンの熱を吸収し、シリンダヘッドの出口を通じて排出され、ヒータまたはラジエータを経由しながら熱を放出した後、再びウォータポンプを通じてエンジンのシリンダブロックに流入する循環過程を経由しながら冷却作用をするようになっている。さらに、エンジンのアウトレットには冷却水温に応じて開閉動作して冷却水の循環経路を切換えるサーモスタット（Ｔｈｅｒｍｏｓｔａｔ）が備えられている。
特開２００３−２５４０５９号公報 In general, in a vehicle water-cooled cooling system, engine coolant is pumped out of a water pump and absorbs engine heat while passing through an engine cylinder block and a cylinder head in order, and is discharged through an outlet of the cylinder head. After the heat is released through the heater or the radiator, the cooling operation is performed again through the circulation process flowing into the cylinder block of the engine through the water pump. Further, the engine outlet is provided with a thermostat that opens and closes according to the cooling water temperature and switches the circulation path of the cooling water.
JP 2003-254059 A

ところで、上記のように構成された従来の冷却システムは、エンジンの負荷条件にかかわらず一定の温度を基点として冷却水循環経路を切換えるようになっており、サーモスタットの機械的な特性による急激な開放によって冷却水温が一定時間下降するが、冷却水温を最適の温度で一定に制御することができず、エンジン冷却系に熱衝撃が発生するだけでなく、車両自体診断のためのＯＢＤ（Ｏｎ Ｂｏａｒｄ Ｄｉａｇｎｏｓｔｉｃ）の冷却状態感知にも不安定性が生ずる問題点があった。
本発明の目的は、エンジンの負荷条件に応じて冷却水温を最適に制御し、熱衝撃及び冷却状態感知の不安定性を防止することができる車両のエンジン冷却システム制御装置及び方法を提供することにある。 By the way, the conventional cooling system configured as described above is configured to switch the cooling water circulation path based on a constant temperature regardless of the engine load condition, and by rapid opening due to the mechanical characteristics of the thermostat. Although the cooling water temperature falls for a certain period of time, the cooling water temperature cannot be controlled at an optimum temperature, and not only a thermal shock occurs in the engine cooling system, but also an OBD (On Board Diagnostics) for diagnosis of the vehicle itself. There was a problem that the instability of the cooling state detection also occurred.
An object of the present invention is to provide a vehicle engine cooling system control apparatus and method capable of optimally controlling the cooling water temperature according to the engine load condition and preventing thermal shock and instability of cooling state sensing. is there.

上記目的を達成するため本発明による車両のエンジン冷却システム制御装置は、ウォータポンプによってポンピングされた冷却水が、エンジンとラジエータとを順に通過しながら循環してエンジンを冷却させるようになっている車両のエンジン冷却システムであって、前記ラジエータを通じて循環する冷却水量を調節する電子バルブ手段と；エンジンを通過した冷却水の温度を感知する温度感知部と；前記温度感知部から感知される冷却水温と目標設定温度に応じて前記電子バルブ手段のバルブ開閉量を制御する制御部と；を含んで構成されたことを特徴とする。   In order to achieve the above object, a vehicle engine cooling system control apparatus according to the present invention is a vehicle in which cooling water pumped by a water pump circulates through the engine and a radiator in order to cool the engine. An electronic valve means for adjusting the amount of cooling water circulating through the radiator; a temperature sensing unit for sensing the temperature of the cooling water that has passed through the engine; and a cooling water temperature sensed from the temperature sensing unit; And a control unit that controls a valve opening / closing amount of the electronic valve means in accordance with a target set temperature.

また、本発明による車両のエンジン冷却システム制御方法は、ウォータポンプによってポンピングされた冷却水がエンジンとラジエータとを順に通過しながら循環してエンジンを冷却させるようになっている車両のエンジン冷却システムにおいて、前記エンジン冷却システムを制御する制御部は、エンジンのスロットルポジションとエンジン回転数から運転負荷を判断するステップと；前記運転負荷に応じて設定温度を決める設定温度決定ステップと；前記決定された設定温度と冷却水温とを比較するステップ及び；前記温度比較結果に応じてバルブ手段のバルブ開閉量を制御して循環する冷却水量を調節するステップ；を有するプロセスで駆動されることを特徴とする。   The vehicle engine cooling system control method according to the present invention is a vehicle engine cooling system in which cooling water pumped by a water pump is circulated while passing through an engine and a radiator in order to cool the engine. A control unit for controlling the engine cooling system; a step of determining an operating load from an engine throttle position and an engine speed; a set temperature determining step for determining a set temperature according to the operating load; and the determined setting And a step of comparing a temperature and a cooling water temperature; and a step of adjusting a circulating water amount by controlling a valve opening / closing amount of the valve means according to the temperature comparison result.

本発明はエンジンの運転負荷条件と温度に応じて冷却水量を細密に調節することにより、エンジンの負荷条件に応じて冷却水温を最適に制御し、熱衝撃及び冷却状態感知の不安定性を防止することができる。   The present invention finely adjusts the amount of cooling water according to the operating load condition and temperature of the engine to optimally control the cooling water temperature according to the engine load condition and prevent instability of thermal shock and cooling state detection. be able to.

以下、本発明の実施例を添付図によって詳述する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１は本発明の好ましい実施例による車両のエンジン冷却システムの概路図である。同図から分かるように、本発明による車両のエンジン冷却システムは、エンジンの冷却水がウォータポンプ１からポンピングされてエンジン２のシリンダブロックとシリンダヘッドとを通過しながらエンジンの熱を吸収し、その後、ヒータコア３を通過しながら車両を暖房し、再びウォータポンプ１に流入する第１循環経路と、エンジンの冷却水がウォータポンプ１からポンピングされてエンジン２のシリンダブロックとシリンダヘッドとを通過しながらエンジンの熱を吸収し、その後、ラジエータ４を経由しながら熱を放出し、再びウォータポンプ１を通じてエンジン２のシリンダブロックに流入する循環過程を経由しながらエンジンを冷凍させる第２循環経路とからなっている。   FIG. 1 is a schematic diagram of a vehicle engine cooling system according to a preferred embodiment of the present invention. As can be seen from the figure, the vehicle engine cooling system according to the present invention absorbs engine heat while pumping engine cooling water from the water pump 1 and passing through the cylinder block and cylinder head of the engine 2. The vehicle is heated while passing through the heater core 3 and the first circulation path flows into the water pump 1 again, and the engine coolant is pumped from the water pump 1 and passes through the cylinder block and the cylinder head of the engine 2. It comprises a second circulation path that absorbs the heat of the engine, then releases the heat through the radiator 4 and freezes the engine through the circulation process that flows into the cylinder block of the engine 2 through the water pump 1 again. ing.

この時、第１循環経路は常に冷却水が流れるようになっており、その循環する冷却水量が非常に小さいため冷却水温に及ぼす影響が非常に小さい。一方、第２循環経路を流れる冷却水量は電子バルブ手段１０、１１、１２によって調節されるようになっている。
そして、ラジエータ４には冷却水温が一定温度を越す場合に動作して空気を送風することによってラジエータ４の熱交換性能を向上させるように冷却ファン手段５が備えられており、エンジン２のアウトレット側の冷却水温を感知して温度感知信号を出力するアウトレット温度ゲージ６が備えられている。 At this time, cooling water always flows through the first circulation path, and since the amount of circulating cooling water is very small, the influence on the cooling water temperature is very small. On the other hand, the amount of cooling water flowing through the second circulation path is adjusted by the electronic valve means 10, 11, 12.
The radiator 4 is provided with cooling fan means 5 so as to improve the heat exchange performance of the radiator 4 by operating when the cooling water temperature exceeds a certain temperature and blowing air. An outlet temperature gauge 6 for detecting the cooling water temperature and outputting a temperature sensing signal is provided.

これと共に、電子バルブ手段１０、１１、１２を制御する制御部２０が備えられるが、電子バルブ手段は、バルブ１０とモータ１１及びモータ駆動部１２を含む。
バルブ１０は、動力の印加に応じて開閉量が調節される形式のバルブであり、モータ１１は動力を発生してバルブ１０に提供する。
例えば、上記モータ１１では回転位置の検出が不要であり、入力信号に応じた正確な位置に回転子が移動するステッピングモータ（Ｓｔｅｐｐｉｎｇ Ｍｏｔｏｒ）を使用できる。
モータ駆動部１２は、制御部２０から印加される信号に応じてモータ１１に電源を印加して駆動する。 Along with this, a control unit 20 for controlling the electronic valve means 10, 11 and 12 is provided.
The valve 10 is a type of valve whose opening / closing amount is adjusted according to the application of power, and the motor 11 generates power and provides it to the valve 10.
For example, the motor 11 does not require detection of the rotational position, and a stepping motor in which the rotor moves to an accurate position according to the input signal can be used.
The motor driving unit 12 drives the motor 11 by applying power to the motor 11 in accordance with a signal applied from the control unit 20.

制御部２０は、エンジン２のスロットルポジションセンサ（図示なし）とエンジン回転数センサ（図示なし）とから入力されるスロットルポジション感知値とエンジン回転数感知値によってエンジン２の運転負荷を判断し、アウトレット温度ゲージ６から入力される温度感知信号によってエンジン２のアウトレット側の冷却水温を判断する。
そして、制御部２０は判断された運転負荷とエンジン２のアウトレット側冷却水温に応じて冷却水の循環経路とバルブ開閉量とを決定し、それに応じてバルブ１０を開閉するための制御信号を発生してモータ駆動部１２に印加する。
例えば、制御部２０から発生する制御信号はパルス幅変調信号（Ｐｕｌｓｅ Ｗｉｄｔｈ Ｍｏｄｕｌａｔｉｏｎ；“ＰＷＭ”）の信号であってもよい。 The control unit 20 determines the operating load of the engine 2 based on the throttle position sensed value and the engine speed sensed value input from the throttle position sensor (not shown) and the engine speed sensor (not shown) of the engine 2, and the outlet. The coolant temperature on the outlet side of the engine 2 is determined based on the temperature sensing signal input from the temperature gauge 6.
Then, the control unit 20 determines the cooling water circulation path and the valve opening / closing amount according to the determined operating load and the outlet side cooling water temperature of the engine 2, and generates a control signal for opening and closing the valve 10 accordingly. And applied to the motor drive unit 12.
For example, the control signal generated from the control unit 20 may be a pulse width modulation signal (“PWM”).

次に、上記のように構成された本発明の動作過程を添付された図面を参照して説明する。
まず、制御部２０はエンジン２のスロットルポジションセンサ（図示なし）とエンジン回転数センサ（図示なし）とから入力されるスロットルポジション感知値とエンジン回転数感知値とを演算してエンジン２の運転負荷値を求め（Ｓ１０）、現在エンジン２の運転負荷が予め設定されている全負荷運転状態か予め設定されている中負荷運転状態であるかを判断する（Ｓ２０）。 Next, the operation process of the present invention configured as described above will be described with reference to the accompanying drawings.
First, the control unit 20 calculates a throttle position sensed value and an engine speed sensed value input from a throttle position sensor (not shown) and an engine speed sensor (not shown) of the engine 2 to calculate the operating load of the engine 2. A value is obtained (S10), and it is determined whether the current operation load of the engine 2 is a preset full load operation state or a preset medium load operation state (S20).

ステップ（Ｓ２０）での判断結果、全負荷運転状態であれば、制御部２０は目標温度を第１設定温度（Ｔ１）（例えば、９０℃程度）に決定し、アウトレット温度ゲージ６から入力される信号によって現在エンジン２のアウトレット側冷却水温を感知し、現在冷却水温を第１設定温度（Ｔ１）と比較する（Ｓ３０）。
前記ステップ（Ｓ３０）での比較結果、現在冷却水温が第１設定温度（Ｔ１）の以下であれば、冷却水温が比較的低くて冷却水の循環が不要な状態であるため、制御部２０はバルブ１０の閉鎖状態を維持すると共に冷却ファン手段５のオフ（Ｏｆｆ）状態を維持する（Ｓ４０）。 If the result of determination in step (S20) is the full load operation state, the control unit 20 determines the target temperature as the first set temperature (T1) (for example, about 90 ° C.) and inputs from the outlet temperature gauge 6. The outlet side cooling water temperature of the engine 2 is detected by the signal, and the current cooling water temperature is compared with the first set temperature (T1) (S30).
If the current cooling water temperature is equal to or lower than the first set temperature (T1) as a result of the comparison in the step (S30), the cooling water temperature is relatively low and the circulation of the cooling water is unnecessary. While the valve 10 is kept closed, the cooling fan means 5 is kept off (S40).

もし、前記ステップ（Ｓ３０）での比較結果、現在冷却水温が第１設定温度（Ｔ１）より高ければ、制御部２０は予め設定されたバルブ開閉量Ａだけバルブ１０を開放するための制御信号を発生してモータ駆動部１２に印加すると同時に、冷却ファン手段５を低速で駆動し（Ｓ５０）、下記のバルブ開閉量ＰＩ制御ステップ（Ｓ８０）に進む。   If the comparison result in the step (S30) shows that the current cooling water temperature is higher than the first set temperature (T1), the control unit 20 outputs a control signal for opening the valve 10 by a preset valve opening / closing amount A. At the same time as it is generated and applied to the motor drive unit 12, the cooling fan means 5 is driven at a low speed (S50), and the process proceeds to the following valve opening / closing amount PI control step (S80).

制御部２０からの制御信号でモータ駆動部１２がモータ１１を動作させ、バルブ１０がＡ開閉量で開放される。このバルブ１０の開放によってエンジンの冷却水がウォータポンプ１から圧出されてエンジン２のシリンダブロックとシリンダヘッドとを順番に経由しながらエンジンの熱を吸収する。その後、シリンダヘッドの出口を通じて排出されてラジエータ４を経由しながら熱を放出した後、再びウォータポンプ１を通じてエンジン２のシリンダブロックに流入する循環過程を経由しながら冷却作用を遂行する。
参考として、バルブ開閉量Ａは後述するバルブ開閉量Ｂよりは循環する冷却水量が小さくなるように設定した値である。 The motor drive unit 12 operates the motor 11 with a control signal from the control unit 20, and the valve 10 is opened by the A opening / closing amount. When the valve 10 is opened, engine cooling water is discharged from the water pump 1 and absorbs engine heat while sequentially passing through the cylinder block and the cylinder head of the engine 2. Then, after being discharged through the outlet of the cylinder head and releasing heat through the radiator 4, the cooling operation is performed again through the circulation process flowing into the cylinder block of the engine 2 through the water pump 1.
For reference, the valve opening / closing amount A is a value set so that the circulating cooling water amount is smaller than the valve opening / closing amount B described later.

一方、ステップ（Ｓ２０）での判断結果、エンジン２の運転負荷状態が全負荷運転状態ではない中負荷運転状態であれば、制御部２０は目標温度を第２設定温度（Ｔ２）（例えば、１１０℃程度）に決定し、アウトレット温度ゲージ６から入力する信号によって現在エンジン２のアウトレット側の冷却水温を感知し、現在冷却水温を第２設定温度（Ｔ２）と比較する（Ｓ６０）。
ステップ（Ｓ６０）での比較結果、現在エンジン２のアウトレット温度が第２設定温度（Ｔ２）以下であれば、冷却水温が比較的低くて冷却水の循環が不要な状態であるため、制御部２０はバルブ１０の閉鎖状態を維持すると共に冷却ファン手段５のオフ（Ｏｆｆ）状態を維持するステップ（Ｓ４０）に進行する。 On the other hand, as a result of the determination in step (S20), if the operation load state of the engine 2 is an intermediate load operation state that is not a full load operation state, the control unit 20 sets the target temperature to the second set temperature (T2) (for example, 110 The cooling water temperature on the outlet side of the engine 2 is sensed by a signal input from the outlet temperature gauge 6, and the current cooling water temperature is compared with the second set temperature (T2) (S60).
As a result of the comparison in step (S60), if the outlet temperature of the engine 2 is currently equal to or lower than the second set temperature (T2), the cooling water temperature is relatively low and the cooling water circulation is unnecessary. Advances to the step (S40) of maintaining the closed state of the valve 10 and maintaining the cooling fan means 5 in the off state.

もし、ステップ（Ｓ６０）での比較結果、現在エンジン２のアウトレット温度が第２設定温度（Ｔ２）より高ければ、制御部２０は予め設定されたバルブ開閉量Ｂだけバルブ１０を開放するための制御信号を発生してモータ駆動部１２に印加すると同時に、冷却ファン手段５を低速で駆動し（Ｓ７０）、下記のバルブ開閉量ＰＩ制御ステップ（Ｓ８０）に進む。   If the outlet temperature of the engine 2 is currently higher than the second set temperature (T2) as a result of the comparison in step (S60), the control unit 20 performs control for opening the valve 10 by a preset valve opening / closing amount B. A signal is generated and applied to the motor drive unit 12, and at the same time, the cooling fan means 5 is driven at a low speed (S70), and the process proceeds to the following valve opening / closing amount PI control step (S80).

制御部２０からの制御信号によってモータ駆動部１２がモータ１１を動作させ、バルブ１０がＢ開閉量で開放される。このバルブ１０の開放によってエンジンの冷却水がウォータポンプ１から圧出されてエンジン２のシリンダブロックとシリンダヘッドとを順番に経由しながらエンジンの熱を吸収する。その後、シリンダヘッドの出口を通じて排出されてラジエータ４を経由しながら熱を放出した後、再びウォータポンプ１を通じてエンジン２のシリンダブロックに流入する循環過程を経由しながら冷却作用を遂行する。
参考として、バルブ開閉量Ｂは前に説明したバルブ開閉量Ａよりは循環する冷却水量が大きくなるように設定した値である。 The motor drive unit 12 operates the motor 11 according to a control signal from the control unit 20, and the valve 10 is opened by the B opening / closing amount. When the valve 10 is opened, engine cooling water is discharged from the water pump 1 and absorbs engine heat while sequentially passing through the cylinder block and the cylinder head of the engine 2. Then, after being discharged through the outlet of the cylinder head and releasing heat through the radiator 4, the cooling operation is performed again through the circulation process flowing into the cylinder block of the engine 2 through the water pump 1.
For reference, the valve opening / closing amount B is a value set so that the circulating cooling water amount is larger than the valve opening / closing amount A described above.

次に、制御部２０は現在エンジン２の温度と、既に決められた設定温度（Ｔ１またはＴ２）とを入力パラメーターとする比例積分制御（ＰＩ制御）によってバルブ１０の開閉量を細密に加減することによって、冷却水温を目標とする設定温度（Ｔ１またはＴ２）に合わせて最適に維持する（Ｓ８０）。
これと同時に、制御部２０は、現在冷却水温を既に決められた設定温度（Ｔ１またはＴ２）に既設定された温度加重値（例えば、３０℃程度）を加算した値と比較する（Ｓ９０）。
ステップ（Ｓ９０）での比較結果、現在冷却水温が既に決められた設定温度（Ｔ１またはＴ２）に温度加重値を加算した値より大きければ、現在冷却水温がかなり高くてより強力な冷却性能が必要な状況であるため、制御部２０は冷却ファン手段５を高速で回転させることによりラジエータ４の熱交換性能を増大させる（Ｓ１００）。 Next, the control unit 20 finely adjusts the opening / closing amount of the valve 10 by proportional-integral control (PI control) using the current temperature of the engine 2 and a predetermined set temperature (T1 or T2) as input parameters. Thus, the cooling water temperature is optimally maintained in accordance with the target set temperature (T1 or T2) (S80).
At the same time, the control unit 20 compares the current coolant temperature with a value obtained by adding a preset temperature weight (for example, about 30 ° C.) to a preset temperature (T1 or T2) that has already been determined (S90).
As a result of the comparison in step (S90), if the current cooling water temperature is larger than the value obtained by adding the temperature weighted value to the preset temperature (T1 or T2), the current cooling water temperature is considerably higher and more powerful cooling performance is required. Therefore, the controller 20 increases the heat exchange performance of the radiator 4 by rotating the cooling fan means 5 at a high speed (S100).

もし、ステップ（Ｓ９０）での比較結果、現在冷却水温が既に決められた設定温度（Ｔ１またはＴ２）に温度加重値を加算した値の以下であれば、制御部２０は現在の冷却水温を第１設定温度（Ｔ１）と再び比較する（Ｓ１１０）。
ステップ（Ｓ１１０）での比較結果、現在の冷却水温が第１設定温度（Ｔ１）以上であれば、制御部２０はバルブ開閉量ＰＩ制御ステップ（Ｓ８０）に戻る反面、現在の冷却水温が第１設定温度（Ｔ１）より小さければ運転負荷を判断するステップ（Ｓ１０）に戻る。 If the comparison result in step (S90) indicates that the current cooling water temperature is equal to or lower than the value obtained by adding the temperature weighted value to the predetermined temperature (T1 or T2), the control unit 20 determines the current cooling water temperature. Comparison is again made with one set temperature (T1) (S110).
If the current cooling water temperature is equal to or higher than the first set temperature (T1) as a result of the comparison in step (S110), the control unit 20 returns to the valve opening / closing amount PI control step (S80), whereas the current cooling water temperature is the first. If the temperature is lower than the set temperature (T1), the process returns to the step (S10) for determining the operation load.

上記において、本発明は特定実施例を例示して説明するが本発明が実施例に限定されるものではない。当業者は本発明に対する多様な変形、修正を容易にすることができ、このような変形または修正が本発明の特徴を利用する限り、本発明の範囲に含まれることは言うまでもない。   In the above, the present invention will be described by exemplifying specific embodiments, but the present invention is not limited to the embodiments. It goes without saying that those skilled in the art can easily make various variations and modifications to the present invention, and such variations and modifications are included in the scope of the present invention as long as the features of the present invention are utilized.

本発明の好ましい実施例による車両のエンジン冷却システムの概路図である。1 is a schematic diagram of a vehicle engine cooling system according to a preferred embodiment of the present invention. 図１に示された制御部の動作過程を説明するためのフローチャートである。2 is a flowchart for explaining an operation process of a control unit shown in FIG. 1.

符号の説明Explanation of symbols

１ ウォータポンプ
２ エンジン
３ ヒータコア
４ ラジエータ
５ 冷却ファン手段
６ アウトレット温度ゲージ
１０ バルブ
１１ モータ
１２ モータ駆動部
２０ 制御部 DESCRIPTION OF SYMBOLS 1 Water pump 2 Engine 3 Heater core 4 Radiator 5 Cooling fan means 6 Outlet temperature gauge 10 Valve 11 Motor 12 Motor drive part 20 Control part

Claims (8)

ウォータポンプによってポンピングされた冷却水が、エンジンとラジエータとを順に通過しながら循環してエンジンを冷却させるようになっている車両のエンジン冷却システムであって、
前記ラジエータを通じて循環する冷却水量を調節する電子バルブ手段と；
エンジンを通過した冷却水の温度を感知する温度感知部と；
前記温度感知部から感知される冷却水温と目標設定温度に応じて前記電子バルブ手段のバルブ開閉量を制御する制御部と；
を含んで構成されたことを特徴とする車両のエンジン冷却システム制御装置。 An engine cooling system for a vehicle in which cooling water pumped by a water pump is circulated while sequentially passing through an engine and a radiator to cool the engine,
Electronic valve means for adjusting the amount of cooling water circulating through the radiator;
A temperature sensing unit for sensing the temperature of the cooling water that has passed through the engine;
A control unit for controlling a valve opening / closing amount of the electronic valve means according to a cooling water temperature and a target set temperature detected from the temperature sensing unit;
An engine cooling system control device for a vehicle, comprising: 前記電子バルブ手段は、前記ラジエータを通じて循環する冷却水量を調節するように開閉量が調節されるバルブと；
前記バルブに動力を伝達してバルブを作動させるモータと；
前記制御部からの制御信号に応じて前記モータに電源を印加して駆動させるモータ駆動部と；
を含んで構成されたことを特徴とする請求項１に記載の車両のエンジン冷却システム制御装置。 The electronic valve means is a valve whose opening / closing amount is adjusted to adjust the amount of cooling water circulating through the radiator;
A motor for transmitting power to the valve to operate the valve;
A motor drive unit that drives the motor by applying power according to a control signal from the control unit;
The vehicle engine cooling system control device according to claim 1, comprising: エンジンのスロットルポジションを感知するスロットルポジションセンサと、
エンジン回転数を感知するエンジン回転数センサをさらに含み、
前記制御部は前記スロットルポジションセンサを通じて感知されるスロットルポジションと前記エンジン回転数センサを通じて感知されるエンジン回転数によってエンジン負荷状態を判断し、判断されたエンジン負荷状態に応じて目標設定温度を決める制御動作をさらに遂行するように構成されたことを特徴とする請求項１に記載の車両のエンジン冷却システム制御装置。 A throttle position sensor that senses the throttle position of the engine;
An engine speed sensor for sensing the engine speed;
The control unit determines an engine load state based on a throttle position sensed through the throttle position sensor and an engine speed sensed through the engine speed sensor, and determines a target set temperature according to the determined engine load state. The vehicle engine cooling system control device according to claim 1, wherein the operation is further performed. 前記ラジエータを冷却させるための冷却ファン手段をさらに備え、前記制御部は前記冷却水温に応じて前記冷却ファン手段を駆動すると共に速度を調節する制御を遂行することを特徴とする請求項１に記載の車両のエンジン冷却システム制御装置。   The cooling fan means for cooling the radiator is further provided, and the controller performs control to drive the cooling fan means and adjust the speed according to the cooling water temperature. Vehicle engine cooling system controller. 前記制御部は、エンジンの温度と目標設定温度とを入力パラメーターとする比例積分制御を通じてバルブ開閉量を決定して制御することを特徴とする請求項１ないし請求項４のいずれか１項に記載の車両のエンジン冷却システム制御装置。   5. The control unit according to claim 1, wherein the control unit determines and controls a valve opening / closing amount through proportional-integral control using an engine temperature and a target set temperature as input parameters. 6. Vehicle engine cooling system controller. ウォータポンプによってポンピングされた冷却水がエンジンとラジエータとを順に通過しながら循環してエンジンを冷却させるようになっている車両のエンジン冷却システムにおいて、前記エンジン冷却システムを制御する制御部は、
エンジンのスロットルポジションとエンジン回転数から運転負荷を判断するステップと；
前記運転負荷に応じて設定温度を決める設定温度決定ステップと；
前記決定された設定温度と冷却水温とを比較するステップ及び；
前記温度比較結果に応じてバルブ手段のバルブ開閉量を制御して循環する冷却水量を調節するステップ；
を有するプロセスで駆動されることを特徴とする車両のエンジン冷却システム制御方法。 In a vehicle engine cooling system in which cooling water pumped by a water pump is circulated while sequentially passing through an engine and a radiator to cool the engine, a control unit that controls the engine cooling system includes:
Determining the operating load from the engine throttle position and engine speed;
A set temperature determining step for determining a set temperature according to the operating load;
Comparing the determined set temperature with a cooling water temperature;
Adjusting the amount of circulating cooling water by controlling the valve opening / closing amount of the valve means according to the temperature comparison result;
A method for controlling an engine cooling system of a vehicle, characterized by being driven by a process having 前記バルブ手段のバルブ開閉量は、前記制御部においてエンジンの温度と前記決定された設定温度とを入力パラメーターとする比例積分制御によって遂行することを特徴とする請求項６に記載の車両のエンジン冷却システム制御方法。   7. The engine cooling of a vehicle according to claim 6, wherein the valve opening / closing amount of the valve means is performed by proportional-integral control using the engine temperature and the determined set temperature as input parameters in the control unit. System control method. 前記制御部はそのプロセスに、冷却水温にラジエータを冷却する冷却ファンを駆動してその速度を調節する冷却ファン速度調節ステップをさらに含み、
前記冷却ファン速度調節ステップでは前記設定温度決定ステップで決定された設定温度と予め設定された加重値とを加算した値をエンジンの現在温度と比べた値に応じて前記冷却ファン速度を調節することを特徴とする請求項６に記載の車両のエンジン冷却システム制御方法。 The controller further includes a cooling fan speed adjusting step of adjusting a speed of the cooling fan by driving a cooling fan that cools the radiator to a cooling water temperature.
In the cooling fan speed adjustment step, the cooling fan speed is adjusted according to a value obtained by adding a value obtained by adding the preset temperature determined in the preset temperature determination step and a preset weight value to a current temperature of the engine. The vehicle engine cooling system control method according to claim 6.
JP2003420225A 2003-09-20 2003-12-17 Vehicle engine cooling system control device and its method Pending JP2005090480A (en)

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