JP2023137296A - Control device for internal combustion engine - Google Patents

Control device for internal combustion engine Download PDF

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JP2023137296A
JP2023137296A JP2022043435A JP2022043435A JP2023137296A JP 2023137296 A JP2023137296 A JP 2023137296A JP 2022043435 A JP2022043435 A JP 2022043435A JP 2022043435 A JP2022043435 A JP 2022043435A JP 2023137296 A JP2023137296 A JP 2023137296A
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internal combustion
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徹 澤田
Toru Sawada
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Mitsubishi Motors Corp
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Abstract

To provide a control device for an internal combustion engine capable of promptly completing warming-up of the engine.SOLUTION: A control device for an internal combustion engine comprises: the internal combustion engine 1; an electric water pump 2 for circulating cooling water of the internal combustion engine 1; water temperature acquisition means 3 for acquiring a cooling water temperature TW of the internal combustion engine 1; oil temperature acquisition means 4 for acquiring an oil temperature TO of the internal combustion engine 1; and control means 5 for controlling the electric water pump 2 on the basis of a difference between the cooling water temperature TW and the oil temperature TW.SELECTED DRAWING: Figure 1

Description

この発明は、内燃機関の制御装置に関する。 The present invention relates to a control device for an internal combustion engine.

内燃機関（以下、エンジンと称する。）の制御装置として、エンジンに機械式ウォーターポンプを併設し、この機械式ウォーターポンプによってエンジンの冷却水を循環させるとともに、エンジンによって加熱された冷却水とエンジン内を潤滑する潤滑油との間で熱交換することによって、この潤滑油の油温を上昇させる方式が広く採用されている。機械式ウォーターポンプは、エンジンのクランクシャフトと機械的に接続されており、この機械式ウォーターポンプの回転数は、エンジンの回転数と比例関係を有している。このため、図５に示すように、エンジンの回転数が一定であれば、機械式ウォーターポンプの回転数は、冷却水温や油温に関係なく暖機過程で常に一定となる。 As a control device for an internal combustion engine (hereinafter referred to as the engine), a mechanical water pump is attached to the engine, and this mechanical water pump circulates the engine cooling water, and also circulates the cooling water heated by the engine and the inside of the engine. A widely used method is to increase the temperature of the lubricating oil by exchanging heat with the lubricating oil. The mechanical water pump is mechanically connected to the crankshaft of the engine, and the rotation speed of the mechanical water pump is proportional to the rotation speed of the engine. Therefore, as shown in FIG. 5, if the engine rotation speed is constant, the rotation speed of the mechanical water pump is always constant during the warm-up process, regardless of the cooling water temperature or oil temperature.

エンジンの暖機においては、冷却水温とともに油温を速やかに上昇させる必要があるが、機械式ウォーターポンプの回転数を冷却水温や油温に関係なくエンジンの回転数に比例させた従来の構成は、油温を速やかに上昇させる点で最適とはいえない。そこで、下記特許文献１に係る構成においては、エンジンの冷却水の冷却水温と潤滑油の油温をそれぞれ測定し、測定された冷却水温とエンジンに許容される限界温度である上限水温との間、および、測定された油温とシリンダブロックに供給される熱量に基づいて推測された推測油温との間の大小関係に基づいて電動ウォーターポンプの回転数を制御して暖機を速やかに行うことにより、フリクションの効果的な低減を目指している。 When warming up an engine, it is necessary to quickly raise the oil temperature along with the cooling water temperature, but the conventional configuration in which the mechanical water pump rotation speed is proportional to the engine rotation speed regardless of the cooling water temperature or oil temperature is , it is not optimal in terms of quickly raising the oil temperature. Therefore, in the configuration according to Patent Document 1 below, the cooling water temperature of the engine cooling water and the oil temperature of the lubricating oil are each measured, and the difference between the measured cooling water temperature and the upper limit water temperature that is the limit temperature allowable for the engine is determined. , and quick warm-up by controlling the rotational speed of the electric water pump based on the magnitude relationship between the measured oil temperature and the estimated oil temperature estimated based on the amount of heat supplied to the cylinder block. By doing so, we aim to effectively reduce friction.

特開２００７－２４０１３号公報Japanese Patent Application Publication No. 2007-24013

図５に一例として示すように、暖機過程においては、冷却水温は比較的速やかに上昇する一方で、油温は冷却水温に比べて温度上昇に遅れが生じることがあるとともに、冷却水温と油温の温度差は暖機過程の初期、後期、および、暖機完了後で異なるという特徴がある。特許文献１に係る構成においては、単に測定された冷却水温と上限水温との間、および、測定された油温と推測油温との間の大小関係に基づいて電動ウォーターポンプの回転数を制御しているのに過ぎず、冷却水温と油温の上昇の特徴を十分考慮しているとは言えず、エンジンの暖機の迅速化の点で改善の余地があるといえる。 As shown in Figure 5 as an example, during the warm-up process, while the cooling water temperature rises relatively quickly, the oil temperature may be delayed in rising compared to the cooling water temperature. The temperature difference is characterized by being different at the beginning and end of the warm-up process, and after the warm-up process is completed. In the configuration according to Patent Document 1, the rotation speed of the electric water pump is simply controlled based on the magnitude relationship between the measured cooling water temperature and the upper limit water temperature, and between the measured oil temperature and the estimated oil temperature. However, it cannot be said that the characteristics of the rise in cooling water temperature and oil temperature are sufficiently taken into account, and there is room for improvement in terms of speeding up engine warm-up.

そこで、この発明は、エンジンの暖機を速やかに完了させることを課題とする。 Therefore, an object of the present invention is to quickly complete warm-up of the engine.

上記の課題を解決するために、この発明においては、
内燃機関と、
前記内燃機関の冷却水を循環させる電動ウォーターポンプと、
前記内燃機関の冷却水温を取得する水温取得手段と、
前記内燃機関の油温を取得する油温取得手段と、
前記冷却水温と前記油温の差に基づいて前記電動ウォーターポンプを制御する制御手段と、
を有する内燃機関の制御装置を構成した。 In order to solve the above problems, in this invention,
internal combustion engine;
an electric water pump that circulates cooling water for the internal combustion engine;
Water temperature acquisition means for acquiring the cooling water temperature of the internal combustion engine;
Oil temperature acquisition means for acquiring oil temperature of the internal combustion engine;
control means for controlling the electric water pump based on the difference between the cooling water temperature and the oil temperature;
A control device for an internal combustion engine was constructed.

この構成においては、
前記制御手段は、
前記冷却水温が予め定めた所定温度未満である第１条件が成立したときに、前記電動ウォーターポンプの出力を第１出力とし、
前記冷却水温が前記所定温度以上かつ前記冷却水温から前記油温を除した温度差が予め定めた所定温度差を超える第２条件が成立したときに、前記電動ウォーターポンプの出力を前記第１出力よりも大きい第２出力とするのが好ましい。 In this configuration,
The control means includes:
When a first condition that the cooling water temperature is less than a predetermined temperature is satisfied, the output of the electric water pump is set as a first output,
When a second condition is established in which the cooling water temperature is equal to or higher than the predetermined temperature and the temperature difference obtained by subtracting the oil temperature from the cooling water temperature exceeds a predetermined temperature difference, the output of the electric water pump is changed to the first output. It is preferable that the second output is larger than the second output.

この構成においては、
前記制御手段は、
前記冷却水温が前記所定温度以上かつ前記温度差が前記所定温度差以下となる第３条件が成立したときに、前記電動ウォーターポンプの出力を前記第１出力よりも大きく前記第２出力よりも小さい第３出力とするのが好ましい。 In this configuration,
The control means includes:
When a third condition is established in which the cooling water temperature is equal to or higher than the predetermined temperature and the temperature difference is equal to or less than the predetermined temperature difference, the output of the electric water pump is set to be greater than the first output and smaller than the second output. Preferably, it is the third output.

この構成においては、
前記制御手段は、
前記第３条件が成立した後は、前記内燃機関が車両の制御に基づいて自動停止するまでは前記電動ウォーターポンプの出力を前記第３出力に維持し、
前記内燃機関が前記自動停止後に再始動した際に、前記第１条件が成立するときは前記電動ウォーターポンプの出力を前記第１出力とし、前記第１条件が成立しないときは前記電動ウォーターポンプの出力を前記第３出力とするのが好ましい。 In this configuration,
The control means includes:
After the third condition is satisfied, the output of the electric water pump is maintained at the third output until the internal combustion engine is automatically stopped based on vehicle control;
When the internal combustion engine is restarted after the automatic stop, if the first condition is satisfied, the output of the electric water pump is set to the first output, and if the first condition is not satisfied, the output of the electric water pump is set to the first output. Preferably, the output is the third output.

この構成においては、
前記所定温度差を、前記内燃機関の回転数が大きいほど小さい値とするのが好ましい。 In this configuration,
Preferably, the predetermined temperature difference is set to a smaller value as the rotational speed of the internal combustion engine increases.

この構成においては、
前記内燃機関は、シリーズ走行モードとパラレル走行モードとを有するハイブリッド車両に搭載されており、
前記第３条件が成立したときの前記電動ウォーターポンプの出力は、前記シリーズ走行モードよりも前記パラレル走行モードの方が大きく設定されているのが好ましい。 In this configuration,
The internal combustion engine is installed in a hybrid vehicle having a series driving mode and a parallel driving mode,
It is preferable that the output of the electric water pump when the third condition is met is set to be larger in the parallel running mode than in the series running mode.

この発明では、制御手段によって、冷却水温と油温の差に基づいて電動ウォーターポンプを制御する構成としたので、暖機過程の初期、後期、および、暖機完了後の全般に亘って電動ウォーターポンプの出力を最適化することができ、エンジンの暖機を速やかに完了させることができる。 In this invention, the electric water pump is controlled by the control means based on the difference between the cooling water temperature and the oil temperature, so that the electric water pump is Pump output can be optimized and engine warm-up can be completed quickly.

この発明に係る内燃機関の制御装置の一実施形態を示すブロック図A block diagram showing an embodiment of an internal combustion engine control device according to the present invention この発明の暖機過程における冷却水温、油温、ポンプ出力の時間変化を示す図Diagram showing temporal changes in cooling water temperature, oil temperature, and pump output during the warm-up process of this invention この発明の暖機過程における冷却水温、油温、ポンプ出力の時間変化の第一変更例を示す図A diagram showing a first example of changes in the temporal changes in cooling water temperature, oil temperature, and pump output during the warm-up process of this invention. この発明の暖機過程における冷却水温、油温、ポンプ出力の時間変化の第二変更例を示す図A diagram showing a second example of changes in the temporal changes in cooling water temperature, oil temperature, and pump output during the warm-up process of this invention. 一般的な暖機過程における冷却水温、油温、ポンプ出力の時間変化を示す図Diagram showing temporal changes in cooling water temperature, oil temperature, and pump output during a general warm-up process

この発明に係る内燃機関の制御装置（以下、制御装置と略称する。）の一実施形態を模式的に図１に示す。この制御装置は、内燃機関１（以下においてはエンジンと称し、内燃機関１と同じ符号を付する。）、電動ウォーターポンプ２、水温取得手段３、油温取得手段４、および、制御手段５を主要な構成要素としている。 An embodiment of an internal combustion engine control device (hereinafter abbreviated as a control device) according to the present invention is schematically shown in FIG. This control device includes an internal combustion engine 1 (hereinafter referred to as an engine and given the same reference numerals as the internal combustion engine 1), an electric water pump 2, a water temperature acquisition means 3, an oil temperature acquisition means 4, and a control means 5. It is a major component.

以下においては、エンジン１としてガソリンエンジンを備えたハイブリッド車両、特に、外部充電または外部給電が可能なプラグインハイブリッド車両（ＰＨＥＶ）を前提に説明する。ここで説明するハイブリッド車両は、エンジン１を発電機の駆動のみに使用しモータのみで車両を駆動するシリーズ走行モードと、エンジンとモータの両方で車両を駆動するパラレル走行モードを有する。なお、この制御装置は、ハイブリッド車両に限定されず、一般的なガソリンエンジン車両やディーゼルエンジン車両など、内燃機関を備えた車両に広く適用することができる。 The following description will be made assuming a hybrid vehicle equipped with a gasoline engine as the engine 1, particularly a plug-in hybrid vehicle (PHEV) capable of external charging or external power supply. The hybrid vehicle described here has a series running mode in which the engine 1 is used only to drive the generator and the vehicle is driven only by the motor, and a parallel running mode in which the vehicle is driven by both the engine and the motor. Note that this control device is not limited to hybrid vehicles, but can be widely applied to vehicles equipped with internal combustion engines, such as general gasoline engine vehicles and diesel engine vehicles.

エンジン１には、このエンジン１を冷却する冷却水を循環させるための冷却水路６が設けられている。電動ウォーターポンプ２は、この冷却水路６に設けられている。電動ウォーターポンプ２の出力は、制御手段５によって制御される。 The engine 1 is provided with a cooling water channel 6 for circulating cooling water for cooling the engine 1. The electric water pump 2 is provided in this cooling water channel 6. The output of the electric water pump 2 is controlled by a control means 5.

水温取得手段３は、エンジン１を冷却する冷却水の温度ＴＷを取得するための手段であって、冷却水路６の所定箇所に設けられている。この実施形態では、水温取得手段３として水温計を採用している。 The water temperature acquisition means 3 is a means for acquiring the temperature TW of the cooling water that cools the engine 1, and is provided at a predetermined location in the cooling water channel 6. In this embodiment, a water temperature meter is employed as the water temperature acquisition means 3.

油温取得手段４は、エンジン１を潤滑する潤滑油の温度ＴＯを取得するための手段であって、エンジン１の所定箇所（例えばメインギャラリ）に設けられている。この実施形態では、油温取得手段４として油温計を採用している。 The oil temperature acquisition means 4 is a means for acquiring the temperature TO of lubricating oil that lubricates the engine 1, and is provided at a predetermined location of the engine 1 (for example, the main gallery). In this embodiment, an oil temperature gauge is employed as the oil temperature acquisition means 4.

エンジン１には、オイルクーラ７が併設されている。このオイルクーラ７内を冷却水と潤滑油が流れることによって、両者の間で熱交換が行われる。すなわち、エンジン１によって加熱された冷却水から潤滑油への熱移動によって油温ＴＯが上昇してエンジン１の暖機が行われる一方で、潤滑油から冷却水への熱移動によってエンジン１を適宜冷却することができる。 The engine 1 is also provided with an oil cooler 7. As the cooling water and lubricating oil flow through the oil cooler 7, heat exchange occurs between them. In other words, heat transfer from the cooling water heated by the engine 1 to the lubricating oil raises the oil temperature TO and warms up the engine 1, while heat transfer from the lubricating oil to the cooling water causes the engine 1 to warm up. It can be cooled appropriately.

制御手段５は、水温取得手段３、油温取得手段４、および、電動ウォーターポンプ２と接続されており、水温取得手段３で取得した冷却水温ＴＷ、および、冷却水温ＴＷと油温取得手段４で取得した油温ＴＯとの温度差ΔＴ（＝ＴＷ－ＴＯ）に基づいて電動ウォーターポンプ２の出力を制御する。 The control means 5 is connected to the water temperature acquisition means 3, the oil temperature acquisition means 4, and the electric water pump 2, and acquires the cooling water temperature T W acquired by the water temperature acquisition means 3, the cooling water temperature T W , and the oil temperature. The output of the electric water pump 2 is controlled based on the temperature difference ΔT (=T W −T O ) with respect to the oil temperature T O obtained by means 4.

具体的には、図２に示すように、制御手段５は、エンジン始動後の暖機過程において、冷却水温ＴＷが予め定めた所定温度Ｋ未満である第１条件が成立したときに、電動ウォーターポンプ２の出力を第１出力（低出力）とし、冷却水温ＴＷが所定温度Ｋ以上かつ冷却水温ＴＷから油温ＴＯを除した温度差ΔＴが予め定めた所定温度差Ｋ１を超える第２条件が成立したときに、電動ウォーターポンプ２の出力を第２出力（高出力）とし、冷却水温ＴＷが所定温度Ｋ以上かつ温度差ΔＴが所定温度差Ｋ１以下となる第３条件が成立したときに、電動ウォーターポンプ２の出力を第１出力よりも大きく第２出力よりも小さい第３出力（中出力）とする制御を行う。 Specifically, as shown in FIG. 2, the control means 5 controls the electric power control when a first condition in which the cooling water temperature TW is less than a predetermined temperature K is satisfied during the warm-up process after the engine is started. The output of the water pump 2 is set as the first output (low output ), the cooling water temperature TW is equal to or higher than the predetermined temperature K, and the temperature difference ΔT obtained by subtracting the oil temperature TO from the cooling water temperature TW is a predetermined temperature difference K1 . When the second condition exceeding the above is satisfied, the output of the electric water pump 2 is set to the second output (high output), and the third condition is such that the cooling water temperature TW is equal to or higher than the predetermined temperature K and the temperature difference ΔT is equal to or lower than the predetermined temperature difference K1 . When the conditions are satisfied, control is performed to set the output of the electric water pump 2 to a third output (middle output) that is larger than the first output and smaller than the second output.

エンジン１の暖機過程においては、図５に示したように、冷却水温ＴＷは比較的速やかに上昇する一方で、油温ＴＯは冷却水温ＴＷに比べて温度上昇に遅れが生じることがある。所定温度Ｋは、冷却水温ＴＷが暖機完了温度に到達した、または、十分近付いたと判断できる程度に温度上昇したことの目安となる温度であり、例えば８０℃とすることができる。また、所定温度差Ｋ１は、潤滑油が十分に加熱された（暖機が完了した）ことの目安となる温度差ΔＴであり、例えば０℃とすることができる。図２は、所定温度差Ｋ１を０℃としたときの制御を示しており、ΔＴが０℃となったときに第２条件から第３条件に移行している。なお、所定温度Ｋと所定温度差Ｋ１は適宜変更することができる。 During the warm-up process of the engine 1, as shown in FIG. 5, while the cooling water temperature TW rises relatively quickly, the oil temperature TO rises with a delay compared to the cooling water temperature TW . There is. The predetermined temperature K is a temperature that indicates that the cooling water temperature TW has reached the warm-up completion temperature or has risen sufficiently to be determined to be sufficiently close to the warm-up completion temperature, and may be, for example, 80°C. Further, the predetermined temperature difference K1 is a temperature difference ΔT that indicates that the lubricating oil has been sufficiently heated (warm-up has been completed), and can be set to, for example, 0°C. FIG. 2 shows control when the predetermined temperature difference K1 is 0° C., and when ΔT becomes 0° C., the second condition is shifted to the third condition. Note that the predetermined temperature K and the predetermined temperature difference K1 can be changed as appropriate.

第１条件における電動ウォーターポンプ２の第１出力は、エンジン１の暖機が完了した定常状態における出力よりも低出力に設定されている。このように低出力として冷却水の循環流量を減らすことにより、車両の走行風による冷却水の冷却が抑制され、冷却水温ＴＷを速やかに上昇させることができる。 The first output of the electric water pump 2 under the first condition is set to be lower than the output in a steady state in which the engine 1 has been warmed up. By setting the output to a low level and reducing the circulating flow rate of the coolant, cooling of the coolant by the wind when the vehicle is running is suppressed, and the coolant temperature TW can be quickly raised.

その一方で、第２条件における電動ウォーターポンプ２の第２出力は、エンジン１の暖機が完了した定常状態における出力（第３出力）よりも高出力に設定されている。このように高出力として冷却水の循環流量を増やすことにより、第１条件の下で速やかに温度上昇した冷却水と潤滑油との間の熱交換を促進して、油温ＴＯを速やかに上昇させてエンジン１の暖機を完了することができる。 On the other hand, the second output of the electric water pump 2 under the second condition is set to be higher than the output (third output) in a steady state when the engine 1 has been warmed up. In this way, by increasing the circulation flow rate of the cooling water with high output, heat exchange between the cooling water and the lubricating oil, whose temperature quickly rose under the first condition, is promoted, and the oil temperature T O is quickly reduced. By raising the engine 1, warming up of the engine 1 can be completed.

第３条件における電動ウォーターポンプ２の第３出力は、エンジン１の暖機が完了した定常状態に相当する出力に設定されている。このように定常状態の出力を保つことにより、冷却水温ＴＷおよび油温ＴＯを適切な温度範囲に維持することができる。なお、第３出力は、エンジン１の回転数や冷却水温ＴＷによって変化させてもよい。また、第２出力は、同条件（エンジン１の回転数や冷却水温ＴＷが同じ状態）において、第３出力よりも高出力に設定されている。 The third output of the electric water pump 2 under the third condition is set to an output corresponding to a steady state in which the engine 1 has been warmed up. By maintaining the output in a steady state in this manner, the cooling water temperature T W and the oil temperature T O can be maintained within appropriate temperature ranges. Note that the third output may be changed depending on the rotational speed of the engine 1 and the cooling water temperature TW . Further, the second output is set to be higher than the third output under the same conditions (the rotational speed of the engine 1 and the cooling water temperature TW are the same).

制御手段５は、第３条件が成立した後は、エンジン１の駆動力によって車両を駆動するエンジン走行からモータの駆動力によって車両を駆動するモータ走行に移行したときや、信号待ち中のアイドリングストップなどのように、エンジン１が車両の制御に基づいて自動停止するまでは、電動ウォーターポンプ２の出力を第３出力に維持するように制御することができる。さらに、制御手段５は、エンジン１がこの自動停止後に再始動した際に、第１条件が成立するとき（冷却水温ＴＷが予め定めた所定温度Ｋ未満のとき）は電動ウォーターポンプ２の出力を第１出力とし、第１条件が成立しないとき（冷却水温ＴＷが予め定めた所定温度Ｋ以上のとき）は、図３に示すように、第３条件に基づいて電動ウォーターポンプ２の出力を第３出力（中出力）とするように制御することができる。 After the third condition is satisfied, the control means 5 is configured to perform an idling stop when the engine driving force drives the vehicle using the driving force of the engine 1 to motor driving driving the vehicle using the motor driving force. The output of the electric water pump 2 can be controlled to be maintained at the third output until the engine 1 is automatically stopped based on the control of the vehicle. Furthermore, when the engine 1 is restarted after this automatic stop, the control means 5 controls the output of the electric water pump 2 when the first condition is satisfied (when the cooling water temperature TW is less than a predetermined temperature K). is set as the first output, and when the first condition is not satisfied (when the cooling water temperature TW is higher than a predetermined temperature K), the output of the electric water pump 2 is set based on the third condition as shown in FIG. can be controlled so that it becomes the third output (medium output).

油温ＴＯは冷却水温ＴＷに比べて温度変化し難いため、エンジン１の再始動時に冷却水温ＴＷが所定温度Ｋ以上であれば、油温ＴＯも所定温度Ｋ程度の高い状態に維持されていると推定できる。このため、冷却水と潤滑油との間の熱交換を促進して油温ＴＯを速やかに上昇させることを目的とする第２条件に係る出力制御を行わずに、エンジン１の暖機が完了した際の第３条件に係る出力制御に直接移行することができる。これにより、電動ウォーターポンプ２の出力を高めることによる消費電力の増加を抑制することができる。 Since the oil temperature T O changes less easily than the coolant temperature T W , if the coolant temperature T W is equal to or higher than the predetermined temperature K when the engine 1 is restarted, the oil temperature T O will also be in a state as high as the predetermined temperature K. It can be assumed that it is maintained. Therefore, the engine 1 cannot be warmed up without performing the output control according to the second condition, which aims to promote heat exchange between the cooling water and the lubricating oil and quickly raise the oil temperature TO . It is possible to directly proceed to the output control according to the third condition upon completion. Thereby, an increase in power consumption due to increasing the output of the electric water pump 2 can be suppressed.

その一方で、自動停止の間に冷却水温ＴＷが所定温度Ｋ未満に低下したときは、上記において説明した通り、冷却水温ＴＷを速やかに上昇させることを目的とする第１条件に係る出力制御を行うことにより、油温ＴＯを高い状態に速やかに戻すことができる。 On the other hand, when the cooling water temperature TW falls below the predetermined temperature K during automatic stop, as explained above, the output according to the first condition is to quickly raise the cooling water temperature TW . By performing the control, the oil temperature TO can be quickly returned to a high state.

所定温度差Ｋ１は、エンジン１の回転数に対応して変更することもできる。具体的には、エンジン１の回転数が大きいほど小さい値とすることができる。所定温度差Ｋ１を小さくすると、第１条件から第２条件への移行のための条件が緩和されることとなり、冷却水から潤滑油への熱交換が行われ易くなるため、油温ＴＯを速やかに上昇させることができる。なお、エンジン１の回転数が大きいときはこのエンジン１の発熱が大きく冷却水温ＴＷが上がりやすいため、第２条件の成立により電動ウォーターポンプ２の出力を大きくして熱交換を促進しても、冷却水温ＴＷの上昇に支障は生じない。 The predetermined temperature difference K1 can also be changed depending on the rotation speed of the engine 1. Specifically, the higher the rotation speed of the engine 1, the smaller the value can be. When the predetermined temperature difference K1 is made smaller, the conditions for transition from the first condition to the second condition are relaxed, and heat exchange from the cooling water to the lubricating oil is facilitated, so the oil temperature T O can be raised quickly. Note that when the engine 1 has a high rotational speed, the engine 1 generates a large amount of heat and the cooling water temperature TW tends to rise. , there will be no problem in increasing the cooling water temperature TW .

また、図４に示すように、第３条件における電動ウォーターポンプ２の第３出力は、シリーズ走行モードよりもパラレル走行モードの方を大きく設定することができる。シリーズ走行モードは、車両が一定速度で走行しているときなどに適用される燃費を重視した走行モードであって、エンジン１は燃費の良い運転点で駆動される。このとき、電動ウォーターポンプ２の出力は、暖機運転の完了時に適用される通常出力とされる。 Further, as shown in FIG. 4, the third output of the electric water pump 2 under the third condition can be set larger in the parallel running mode than in the series running mode. The series running mode is a running mode that emphasizes fuel efficiency and is applied when the vehicle is running at a constant speed, and the engine 1 is driven at an operating point with good fuel efficiency. At this time, the output of the electric water pump 2 is set to the normal output applied when the warm-up operation is completed.

これに対し、パラレル走行モードは、車両の加速時や高負荷時のようにエンジン１に高出力が求められるときなどに適用される走行モードであって、電動ウォーターポンプ２の出力は、暖機運転の完了時に適用される通常出力よりも高く設定される。このように、パラレル走行モードにおいて電動ウォーターポンプ２の出力を高くすることによって、冷却水温ＴＷの過大な上昇を抑制するとともに、潤滑油から冷却水への熱交換が促進されて、油温ＴＯの過大な上昇を抑制することができる。 On the other hand, the parallel driving mode is a driving mode that is applied when high output is required from the engine 1, such as when the vehicle is accelerating or under high load, and the output of the electric water pump 2 is It is set higher than the normal power applied at the completion of the run. In this way, by increasing the output of the electric water pump 2 in the parallel running mode, an excessive rise in the cooling water temperature TW is suppressed, and heat exchange from the lubricating oil to the cooling water is promoted, so that the oil temperature T An excessive increase in O can be suppressed.

今回開示された実施形態はすべての点で例示であって制限的なものではないと考えられるべきである。したがって、本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. Therefore, the scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

１ 内燃機関（エンジン）
２ 電動ウォーターポンプ
３ 水温取得手段
４ 油温取得手段
５ 制御手段
６ 冷却水路
７ オイルクーラ
ＴＷ 冷却水温
ＴＯ 油温
Ｋ 所定温度
ΔＴ 温度差
Ｋ１ 所定温度差 1 Internal combustion engine (engine)
2 Electric water pump 3 Water temperature acquisition means 4 Oil temperature acquisition means 5 Control means 6 Cooling water channel 7 Oil cooler T W cooling water temperature T O oil temperature K Predetermined temperature ΔT Temperature difference K 1 Predetermined temperature difference

Claims (6)

内燃機関と、
前記内燃機関の冷却水を循環させる電動ウォーターポンプと、
前記内燃機関の冷却水温を取得する水温取得手段と、
前記内燃機関の油温を取得する油温取得手段と、
前記冷却水温と前記油温の差に基づいて前記電動ウォーターポンプを制御する制御手段と、
を有する内燃機関の制御装置。 internal combustion engine;
an electric water pump that circulates cooling water for the internal combustion engine;
Water temperature acquisition means for acquiring the cooling water temperature of the internal combustion engine;
Oil temperature acquisition means for acquiring oil temperature of the internal combustion engine;
control means for controlling the electric water pump based on the difference between the cooling water temperature and the oil temperature;
A control device for an internal combustion engine. 前記制御手段は、
前記冷却水温が予め定めた所定温度未満である第１条件が成立したときに、前記電動ウォーターポンプの出力を第１出力とし、
前記冷却水温が前記所定温度以上かつ前記冷却水温から前記油温を除した温度差が予め定めた所定温度差を超える第２条件が成立したときに、前記電動ウォーターポンプの出力を前記第１出力よりも大きい第２出力とする
請求項１に記載の内燃機関の制御装置。 The control means includes:
When a first condition that the cooling water temperature is less than a predetermined temperature is satisfied, the output of the electric water pump is set as a first output,
When a second condition is established in which the cooling water temperature is equal to or higher than the predetermined temperature and the temperature difference obtained by subtracting the oil temperature from the cooling water temperature exceeds a predetermined temperature difference, the output of the electric water pump is changed to the first output. The control device for an internal combustion engine according to claim 1, wherein the second output is larger than the second output. 前記制御手段は、
前記冷却水温が前記所定温度以上かつ前記温度差が前記所定温度差以下となる第３条件が成立したときに、前記電動ウォーターポンプの出力を前記第１出力よりも大きく前記第２出力よりも小さい第３出力とする
請求項２に記載の内燃機関の制御装置。 The control means includes:
When a third condition in which the cooling water temperature is equal to or higher than the predetermined temperature and the temperature difference is equal to or lower than the predetermined temperature difference is satisfied, the output of the electric water pump is set to be greater than the first output and smaller than the second output. The control device for an internal combustion engine according to claim 2, wherein the third output is the third output. 前記制御手段は、
前記第３条件が成立した後は、前記内燃機関が車両の制御に基づいて自動停止するまでは前記電動ウォーターポンプの出力を前記第３出力に維持し、
前記内燃機関が前記自動停止後に再始動した際に、前記第１条件が成立するときは前記電動ウォーターポンプの出力を前記第１出力とし、前記第１条件が成立しないときは前記電動ウォーターポンプの出力を前記第３出力とする
請求項３に記載の内燃機関の制御装置。 The control means includes:
After the third condition is satisfied, the output of the electric water pump is maintained at the third output until the internal combustion engine is automatically stopped based on vehicle control;
When the internal combustion engine is restarted after the automatic stop, if the first condition is satisfied, the output of the electric water pump is set to the first output, and if the first condition is not satisfied, the output of the electric water pump is set to the first output. The control device for an internal combustion engine according to claim 3, wherein the output is the third output. 前記所定温度差を、前記内燃機関の回転数が大きいほど小さい値とする
請求項２から４のいずれか１項に記載の内燃機関の制御装置。 5. The control device for an internal combustion engine according to claim 2, wherein the predetermined temperature difference is set to a smaller value as the rotational speed of the internal combustion engine increases. 前記内燃機関は、シリーズ走行モードとパラレル走行モードとを有するハイブリッド車両に搭載されており、
前記第３条件が成立したときの前記電動ウォーターポンプの出力は、前記シリーズ走行モードよりも前記パラレル走行モードの方が大きく設定されている
請求項２から５のいずれか１項に記載の内燃機関の制御装置。 The internal combustion engine is installed in a hybrid vehicle having a series driving mode and a parallel driving mode,
The internal combustion engine according to any one of claims 2 to 5, wherein the output of the electric water pump when the third condition is satisfied is set to be larger in the parallel running mode than in the series running mode. control device.
JP2022043435A 2022-03-18 2022-03-18 Control device for internal combustion engine Pending JP2023137296A (en)

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