JP2013024085A - Engine control device - Google Patents

Engine control device Download PDF

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JP2013024085A
JP2013024085A JP2011157901A JP2011157901A JP2013024085A JP 2013024085 A JP2013024085 A JP 2013024085A JP 2011157901 A JP2011157901 A JP 2011157901A JP 2011157901 A JP2011157901 A JP 2011157901A JP 2013024085 A JP2013024085 A JP 2013024085A
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cooling water
water temperature
engine
temperature
estimated
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JP5919664B2 (en
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Chihiro Otsuka
千尋 大塚
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Abstract

PROBLEM TO BE SOLVED: To optimize various kinds of the control of an engine when cooling water circulation stops in an engine control device.SOLUTION: The engine control device which stops the cooling water circulation of a water jacket 13 during engine warm-up includes: a water temperature sensor 19; engine operating condition detection sensors 22 and 23; a cooling water temperature rise estimating unit 41 which estimates a water temperature rise of the cooling water based on the engine operating condition; an estimated cooling water temperature calculation unit 42 which calculates an estimated cooling water temperature by adding the water temperature rise estimated by the cooling water temperature rise estimating unit 41 to a detection value of the water temperature sensor 19 when starting up the engine; and an operating state control unit 45 which controls an operating state of the engine 10 based on the detection values of the operating condition detection sensors 22 and 23 and the estimated cooling water temperature calculated by the estimated cooling water temperature calculation unit 42.

Description

本発明は、エンジンの制御装置に関し、特に暖機時に冷却水循環を停止させるエンジンの制御装置に関する。   The present invention relates to an engine control device, and more particularly to an engine control device that stops cooling water circulation during warm-up.

エンジンの冷却システムとして、冷却水回路に冷却水を圧送供給する電動ウォータポンプを備え、暖機促進の観点から、冷却水温の低温時には電動ウォータポンプを停止させることで、冷却水の循環を停止させるシステムが知られている（例えば、特許文献１参照）。   As an engine cooling system, an electric water pump that pumps and supplies cooling water to the cooling water circuit is provided. From the viewpoint of promoting warm-up, the cooling of the cooling water is stopped by stopping the electric water pump when the cooling water temperature is low. A system is known (see, for example, Patent Document 1).

特開２００２−１６１７４８号公報JP 2002-161748 A

ところで、一般的にエンジンの燃料噴射量、燃料噴射圧、吸入空気量等の各種制御に用いるパラメータの一つとして、サーモスタット周辺にある水温センサの検出値が用いられている。これは、冷却水が冷却水回路を循環してウォータジャケット内を流通している時は、水温センサで検出される冷却水温とシリンダ壁面温度とに相関があると考えられるためである。   By the way, the detection value of the water temperature sensor around the thermostat is used as one of parameters generally used for various controls such as the fuel injection amount, fuel injection pressure, and intake air amount of the engine. This is because when the cooling water circulates through the cooling water circuit and flows through the water jacket, it is considered that there is a correlation between the cooling water temperature detected by the water temperature sensor and the cylinder wall surface temperature.

しかし、上述の暖機時にウォータポンプを停止させるようなシステムでは、冷却水循環の停止により、水温センサで検出値される冷却水温とシリンダ壁面温度との相関が成り立たなくなる場合がある。そのため、エンジンの各種制御に水温センサの検出値を用いると、特に冷却水循環が停止した状態では、運転状態に応じた最適な制御を行えない可能性がある。   However, in a system in which the water pump is stopped at the time of warm-up described above, the correlation between the coolant temperature detected by the coolant temperature sensor and the cylinder wall surface temperature may not be established due to the stop of the coolant circulation. For this reason, when the detection value of the water temperature sensor is used for various controls of the engine, there is a possibility that optimum control according to the operating state cannot be performed particularly in a state where the cooling water circulation is stopped.

本発明は、このような点に鑑みてなされたもので、その目的は、冷却水循環が停止した際のエンジンの各種制御を適正化して、エンジンの排気ガス悪化や失火による燃焼悪化を効果的に防止することにある。   The present invention has been made in view of the above points, and its purpose is to optimize various control of the engine when the cooling water circulation is stopped, and to effectively prevent deterioration of engine exhaust gas and combustion due to misfire. It is to prevent.

上記目的を達成するため、本発明のエンジンの制御装置は、ウォータジャケットを含む冷却水回路を備え、エンジン始動時から冷却水温が所定温度に上昇するまで前記ウォータジャケットの冷却水循環を停止させるエンジンの制御装置であって、前記冷却水回路内の冷却水温を検出する冷却水温検出手段と、少なくともエンジン回転数及び、燃料噴射量を含む前記エンジンの運転状態を検出する運転状態検出手段と、前記運転状態検出手段により検出されるエンジンの運転状態に基づいて、冷却水の水温上昇幅を所定時間毎に推定する冷却水温上昇幅推定部と、エンジン始動時における前記冷却水温検出手段の検出値を初期水温に設定し、該初期水温にエンジン始動時から所定期間経過時までに前記冷却水温上昇幅推定部により推定された各水温上昇幅を積算することで、該所定期間経過時の推定冷却水温を算出する推定冷却水温演算部と、少なくとも前記運転状態検出手段の検出値及び、前記推定冷却水温演算部により算出される推定冷却水温に基づいて、前記エンジンの運転状態を制御する運転状態制御部とを備えることを特徴とする。   In order to achieve the above object, an engine control apparatus according to the present invention includes a cooling water circuit including a water jacket, and stops the circulation of cooling water in the water jacket until the cooling water temperature rises to a predetermined temperature from the start of the engine. A control device for detecting a cooling water temperature in the cooling water circuit; an operating state detecting means for detecting an operating state of the engine including at least an engine speed and a fuel injection amount; and the operation Based on the operating state of the engine detected by the state detection means, a cooling water temperature rise estimation section for estimating the cooling water temperature rise width every predetermined time, and the detected value of the cooling water temperature detection means at the time of engine start are initialized. The water temperature is set, and the initial water temperature is estimated by the cooling water temperature increase width estimation unit from when the engine is started to when a predetermined period has elapsed. An estimated cooling water temperature calculation unit that calculates an estimated cooling water temperature when the predetermined period has elapsed by integrating the temperature increase width, at least a detection value of the operating state detection means, and an estimation calculated by the estimated cooling water temperature calculation unit And an operation state control unit that controls the operation state of the engine based on a coolant temperature.

また、前記運転状態制御部は、前記推定冷却水温演算部により算出される推定冷却水温が所定温度よりも高くなった場合は、前記推定冷却水温に切り替えて前記冷却水温検出手段の検出値を前記エンジンの運転状態の制御に用いてもよい。   In addition, when the estimated cooling water temperature calculated by the estimated cooling water temperature calculation unit is higher than a predetermined temperature, the operation state control unit switches to the estimated cooling water temperature and sets the detection value of the cooling water temperature detection unit to You may use for control of the driving | running state of an engine.

また、外気温を検出する外気温検出手段と、前記推定冷却水温演算部により算出される推定冷却水温を、該推定冷却水温と前記外気温検出手段により検出された外気温との温度差に基づいて補正する推定冷却水温補正部とをさらに備えてもよい。   Further, the outside air temperature detecting means for detecting the outside air temperature, and the estimated cooling water temperature calculated by the estimated cooling water temperature calculation unit are based on the temperature difference between the estimated cooling water temperature and the outside air temperature detected by the outside air temperature detecting means. An estimated cooling water temperature correction unit that corrects the temperature may be further provided.

本発明のエンジンの制御装置によれば、冷却水循環が停止した際のエンジンの各種制御を適正化することができると共に、エンジンの排気ガス悪化や失火による燃焼悪化を効果的に防止することができる。   According to the engine control device of the present invention, various control of the engine when the cooling water circulation is stopped can be optimized, and deterioration of the exhaust gas of the engine and combustion deterioration due to misfire can be effectively prevented. .

本発明の一実施形態に係るエンジンの制御装置を示す模式的なブロック構成図である。1 is a schematic block diagram showing an engine control apparatus according to an embodiment of the present invention. 本発明の一実施形態に係るエンジンの制御装置の制御内容を示すフローチャートである。It is a flowchart which shows the control content of the control apparatus of the engine which concerns on one Embodiment of this invention.

以下、図１，２に基づいて、本発明の一実施形態に係るエンジンの制御装置を説明する。同一の部品には同一の符号を付してあり、それらの名称および機能も同じである。したがって、それらについての詳細な説明は繰返さない。   Hereinafter, an engine control apparatus according to an embodiment of the present invention will be described with reference to FIGS. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

図１に示すように、本実施形態に係るエンジンの制御装置１は、エンジン１０のシリンダブロック１２内に形成されたウォータジャケット１３と、エンジン１０の前方に所定の間隔を隔て配設されたラジエータ１４と、ウォータジャケット１３からの冷却水をラジエータ１４に導くインレット配管１５と、ラジエータ１４からの冷却水をウォータジャケット１３に導くアウトレット配管１６と、冷却水をラジエータ１４から迂回させるバイパス配管１７と、冷却水の流路を切り替えるサーモスタット１８と、冷却水の水温を検出する水温センサ１９と、冷却水を圧送供給する電動ウォータポンプ２０と、エンジン回転センサ２２と、アクセル開度センサ２３と、ＥＣＵ（電子制御ユニット）４０とを有する。なお、本実施形態において、ウォータジャケット１３、ラジエータ１４、インレット配管１５、アウトレット配管１６及びバイパス配管１７は、本発明の冷却水回路を構成する。   As shown in FIG. 1, an engine control apparatus 1 according to this embodiment includes a water jacket 13 formed in a cylinder block 12 of an engine 10 and a radiator disposed at a predetermined interval in front of the engine 10. 14, an inlet pipe 15 that guides cooling water from the water jacket 13 to the radiator 14, an outlet pipe 16 that guides cooling water from the radiator 14 to the water jacket 13, and a bypass pipe 17 that bypasses the cooling water from the radiator 14, A thermostat 18 that switches the flow path of the cooling water, a water temperature sensor 19 that detects the temperature of the cooling water, an electric water pump 20 that pumps the cooling water, an engine rotation sensor 22, an accelerator opening sensor 23, an ECU ( Electronic control unit) 40. In the present embodiment, the water jacket 13, the radiator 14, the inlet pipe 15, the outlet pipe 16, and the bypass pipe 17 constitute the cooling water circuit of the present invention.

ウォータジャケット１３は、シリンダブロック１２内の図示しないシリンダ壁面に隣接して形成されている。また、シリンダブロック１２側にあるウォータジャケット１３の入口部１３ａは電動ウォータポンプ２０の吐出口に接続され、シリンダヘッド１１側にあるウォータジャケット１３の出口部１３ｂはインレット配管１５の上流端に接続されている。すなわち、電動ウォータポンプ２０により圧送供給されて入口部１３ａから流入した冷却水は、ウォータジャケット１３内を流通した後、出口部１３ｂからインレット配管１５へと流れ込むように構成されている。   The water jacket 13 is formed adjacent to a cylinder wall surface (not shown) in the cylinder block 12. Further, the inlet portion 13 a of the water jacket 13 on the cylinder block 12 side is connected to the discharge port of the electric water pump 20, and the outlet portion 13 b of the water jacket 13 on the cylinder head 11 side is connected to the upstream end of the inlet pipe 15. ing. That is, the cooling water that is pressure-fed and supplied from the inlet portion 13 a by the electric water pump 20 flows through the water jacket 13 and then flows from the outlet portion 13 b to the inlet pipe 15.

ラジエータ１４の上方側部に設けられた入口部１４ａには、インレット配管１５の下流端が接続されている。また、ラジエータ１４の下方側部に設けられた出口部１４ｂには、アウトレット配管１６の上流端が接続されている。すなわち、インレット配管１５からラジエータ１４に流入した冷却水は、ラジエータ１４で外気との熱交換により冷却された後、アウトレット配管１６から電動ウォータポンプ２０を介してウォータジャケット１３に戻されるように構成されている。   A downstream end of the inlet pipe 15 is connected to an inlet portion 14 a provided on the upper side portion of the radiator 14. The upstream end of the outlet pipe 16 is connected to an outlet portion 14 b provided on the lower side portion of the radiator 14. That is, the cooling water flowing into the radiator 14 from the inlet pipe 15 is cooled by heat exchange with the outside air in the radiator 14 and then returned to the water jacket 13 from the outlet pipe 16 via the electric water pump 20. ing.

バイパス配管１７は、ラジエータ１４を迂回するように、一端をインレット配管１５に接続され、他端をアウトレット配管１６に接続されている。また、バイパス配管１７とインレット配管１５との分岐部にはサーモスタット１８が介装されている。   The bypass pipe 17 has one end connected to the inlet pipe 15 and the other end connected to the outlet pipe 16 so as to bypass the radiator 14. A thermostat 18 is interposed at a branch portion between the bypass pipe 17 and the inlet pipe 15.

サーモスタット１８は、インレット配管１５を流れる冷却水の水温が所定水温（例えば、８５度）まで上昇すると開弁し、冷却水のラジエータ１４への流通を許容する開閉弁として機能する。すなわち、冷却水の温度が所定温度（例えば、８５度）未満の場合、サーモスタット１８は閉弁され、冷却水はラジエータ１４を迂回してバイパス配管１７に流入する。一方、冷却水の温度が所定温度（例えば、８５度）以上になると、サーモスタット１８は開弁され、冷却水はインレット配管１５からラジエータ１４に流入するように構成されている。このサーモスタット１８としては、例えば公知のワックスタイプのサーモスタットが使用される。   The thermostat 18 opens when the temperature of the cooling water flowing through the inlet pipe 15 rises to a predetermined water temperature (for example, 85 degrees), and functions as an on-off valve that allows the cooling water to flow to the radiator 14. That is, when the temperature of the cooling water is less than a predetermined temperature (for example, 85 degrees), the thermostat 18 is closed, and the cooling water bypasses the radiator 14 and flows into the bypass pipe 17. On the other hand, when the temperature of the cooling water reaches a predetermined temperature (for example, 85 degrees) or more, the thermostat 18 is opened, and the cooling water is configured to flow into the radiator 14 from the inlet pipe 15. As this thermostat 18, for example, a known wax type thermostat is used.

水温センサ１９は、冷却水の温度を検出するもので、サーモスタット１８よりも上流側に位置するインレット配管１５に設けられている。この水温センサ１９はＥＣＵ４０に電気的に接続されており、検出された冷却水の温度は冷却水温ＴSとして出力される。 The water temperature sensor 19 detects the temperature of the cooling water, and is provided in the inlet pipe 15 positioned upstream of the thermostat 18. The water temperature sensor 19 is electrically connected to the ECU 40, the detected temperature of the cooling water is outputted as a cooling water temperature T S.

電動ウォータポンプ２０は、シリンダブロック１２の入口部１３ａに隣接して設けられており、その取入口にはアウトレット配管１６の下流端が接続されている。この電動ウォータポンプ２０は、図示しないインペラの回転により冷却水を圧送する公知の遠心式ポンプで、図示しないインペラシャフトに接続された駆動モータ２１を備えている。   The electric water pump 20 is provided adjacent to the inlet portion 13a of the cylinder block 12, and the downstream end of the outlet pipe 16 is connected to the intake port. The electric water pump 20 is a known centrifugal pump that pumps cooling water by rotating an impeller (not shown), and includes a drive motor 21 connected to an impeller shaft (not shown).

駆動モータ２１は、ＥＣＵ４０と電気的に接続されており、ＥＣＵ４０から出力される電気信号に応じて作動が制御されている。すなわち、電動ウォータポンプ２０は、ＥＣＵ４０によって駆動モータ２１の作動が制御されることで、冷却水の圧送供給（循環）と、圧送供給の停止（循環の停止）とを行うように構成されている。   The drive motor 21 is electrically connected to the ECU 40 and its operation is controlled in accordance with an electrical signal output from the ECU 40. That is, the electric water pump 20 is configured to perform the pumping supply (circulation) of the cooling water and stop the pumping supply (stopping the circulation) by controlling the operation of the drive motor 21 by the ECU 40. .

エンジン回転数センサ２２は、エンジン１０の回転数を検出するもので、検出された回転数は電気的に接続されたＥＣＵ４０にエンジン回転数Ｎとして出力される。   The engine speed sensor 22 detects the speed of the engine 10, and the detected speed is output as an engine speed N to the electrically connected ECU 40.

アクセル開度センサ２３は、運転者によるアクセルペダル（不図示）の踏み込み量を検出するもので、検出された踏み込み量としての燃料噴射量は、電気的に接続されたＥＣＵ４０に燃料噴射量Ｑとして出力される。   The accelerator opening sensor 23 detects the amount of depression of an accelerator pedal (not shown) by the driver, and the detected fuel injection amount is determined as a fuel injection amount Q to the electrically connected ECU 40. Is output.

外気温センサ２４は、エンジン１０を搭載した車両（不図示）の外気温度を検出するもので、検出された外気温度は電気的に接続されたＥＣＵ４０に外気温ＴOUTとして出力される。 The outside air temperature sensor 24 detects an outside air temperature of a vehicle (not shown) on which the engine 10 is mounted, and the detected outside air temperature is output as an outside air temperature T OUT to the electrically connected ECU 40.

ＥＣＵ４０は、エンジン１０や車両の各種制御を行うもので、公知のＣＰＵやＲＯＭ、ＲＡＭ、入力ポート、出力ポート等を備え構成されている。この各種制御を行うために、ＥＣＵ４０には、車速センサ（不図示）、水温センサ１９、エンジン回転数センサ２２、アクセル開度センサ２３等の各種センサの出力信号がＡ／Ｄ変換された後に入力される。また、ＥＣＵ４０は、冷却水温上昇幅推定部４１と、推定冷却水温演算部４２と、推定冷却水温補正部４３と、駆動モータ制御部４４と、エンジン制御部４５とを一部の機能要素として有する。これら各機能要素は、本実施形態では一体のハードウェアであるＥＣＵ４０に含まれるものとして説明するが、これらのいずれか一部を別体のハードウェアに設けることもできる。   The ECU 40 performs various controls of the engine 10 and the vehicle, and includes a known CPU, ROM, RAM, input port, output port, and the like. In order to perform these various controls, the ECU 40 inputs the output signals of various sensors such as a vehicle speed sensor (not shown), a water temperature sensor 19, an engine speed sensor 22, and an accelerator opening sensor 23 after A / D conversion. Is done. In addition, the ECU 40 includes a cooling water temperature rise estimation unit 41, an estimated cooling water temperature calculation unit 42, an estimated cooling water temperature correction unit 43, a drive motor control unit 44, and an engine control unit 45 as some functional elements. . In the present embodiment, these functional elements are described as being included in the ECU 40, which is an integral piece of hardware. However, any one of these functional elements may be provided in separate hardware.

冷却水温上昇幅推定部４１は、エンジン回転数Ｎ及び燃料噴射量Ｑに基づいて、シリンダ壁面に隣接して形成されたウォータジャケット１３内にある冷却水の水温上昇幅ΔＴを所定時間毎（例えば、１秒毎）に推定する。ＥＣＵ４０の記憶部には、予め実験等で作成したエンジン回転数Ｎと燃料噴射量Ｑと冷却水の水温上昇幅ΔＴとの関係を示す水温上昇マップ（不図示）が記憶されている。冷却水温上昇幅推定部４１は、この水温上昇マップから所定時間毎（例えば、１秒毎）にエンジン回転数Ｎ及び燃料噴射量Ｑに対応する水温上昇幅ΔＴを読み取ることで、エンジン１０の運転状態に応じたウォータジャケット１３内の冷却水温上昇値を推定する。   Based on the engine speed N and the fuel injection amount Q, the cooling water temperature rise width estimation unit 41 calculates the water temperature rise width ΔT of the cooling water in the water jacket 13 formed adjacent to the cylinder wall surface every predetermined time (for example, Every 1 second). In the storage unit of the ECU 40, a water temperature increase map (not shown) indicating the relationship among the engine speed N, the fuel injection amount Q, and the cooling water temperature increase width ΔT, which is created in advance through experiments or the like, is stored. The cooling water temperature increase width estimation unit 41 reads the water temperature increase width ΔT corresponding to the engine speed N and the fuel injection amount Q from the water temperature increase map at predetermined time intervals (for example, every second), thereby operating the engine 10. The cooling water temperature rise value in the water jacket 13 according to the state is estimated.

推定冷却水温演算部４２は、冷却水循環が停止したエンジン暖機時におけるウォータジャケット１３内の冷却水の推定温度（以下、推定冷却水温ＴEという）を算出する。より詳しくは、推定冷却水温演算部４２は、エンジン始動時に水温センサ１９により検出された冷却水温ＴSを初期水温Ｔ0として保存する。その後、推定冷却水温演算部４２は、この初期水温Ｔ0にエンジン始動後から現在までの間に冷却水温上昇幅推定部４１で所定時間毎に推定された各水温上昇幅ΔＴを積算することで、現在の推定冷却水温ＴEを算出するように構成されている。例えば、初期水温Ｔ0が外気と同じ１８℃の状態で、エンジン始動から現在までに水温上昇幅ΔＴが８℃、６℃及び、９℃と３回ほど推定された場合、推定冷却水温演算部４２は現在の推定冷却水温ＴEを４１℃（＝１８℃＋８℃＋６℃＋９℃）と算出する。 The estimated cooling water temperature calculation unit 42 calculates an estimated temperature of cooling water in the water jacket 13 (hereinafter referred to as an estimated cooling water temperature T E ) at the time of engine warm-up when cooling water circulation is stopped. More specifically, the estimated cooling water temperature calculation unit 42 stores the cooling water temperature T S detected by the water temperature sensor 19 when the engine is started as the initial water temperature T 0 . Thereafter, the estimated cooling water temperature calculation unit 42 accumulates each water temperature increase width ΔT estimated by the cooling water temperature increase width estimation unit 41 every predetermined time from the start of the engine to the present time to the initial water temperature T 0. The current estimated coolant temperature T E is calculated. For example, when the initial water temperature T 0 is 18 ° C., which is the same as the outside air, and the water temperature increase ΔT is estimated three times as 8 ° C., 6 ° C., and 9 ° C. from the start of the engine to the present, an estimated cooling water temperature calculation unit 42 calculates the current estimated cooling water temperature T E as 41 ° C. (= 18 ° C. + 8 ° C. + 6 ° C. + 9 ° C.).

推定冷却水温補正部４３は、推定冷却水温演算部４２により算出された推定冷却水温ＴEを外気温ＴOUTとの温度差に基づいて補正する。ＥＣＵ４０の記憶部には、予め実験等で作成した推定冷却水温ＴEと外気温との温度差及び補正量の関係を示す補正マップ（不図示）が記憶されている。推定冷却水温補正部４３は、この補正マップから推定冷却水温ＴEと外気温ＴOUTとの温度差に対応する補正量を読み取ることで、伝熱を考慮した正確な補正推定冷却水温ＴCを算出する。 The estimated cooling water temperature correction unit 43 corrects the estimated cooling water temperature T E calculated by the estimated cooling water temperature calculation unit 42 based on the temperature difference from the outside air temperature T OUT . In the storage unit of the ECU 40, a correction map (not shown) indicating the relationship between the temperature difference between the estimated cooling water temperature T E and the outside air temperature, which is created in advance through experiments or the like, and the correction amount is stored. The estimated cooling water temperature correction unit 43 reads the correction amount corresponding to the temperature difference between the estimated cooling water temperature T E and the outside air temperature T OUT from this correction map, so that an accurate corrected estimated cooling water temperature T C in consideration of heat transfer can be obtained. calculate.

駆動モータ制御部４４は、電動ウォータポンプ２０のインペラシャフトに接続された駆動モータ２１の作動を制御する。具体的には、この駆動モータ制御部４４は推定冷却水温補正部４３により算出される補正推定冷却水温ＴCが所定温度（例えば８５℃）に達するまでは、駆動モータ２１に作動信号を出力しない。すなわち、エンジン１０の暖機時は、冷却水の水温を早期に上昇させるべく、ウォータジャケット１３内の冷却水の循環は停止されるように構成されている。一方、推定冷却水温補正部４３により算出される補正推定冷却水温ＴCが所定温度（例えば８５℃）以上になると、駆動モータ制御部４４はエンジン回転数Ｎや燃料噴射量Ｑに応じた作動信号を駆動モータ２１に出力する。すなわち、エンジン１０の暖機終了後は、駆動モータ２１がエンジン１０の運転状態に応じて作動され、冷却水は電動ウォータポンプ２０によりエンジン１０の運転状態に応じて圧送供給されるように構成されている。 The drive motor control unit 44 controls the operation of the drive motor 21 connected to the impeller shaft of the electric water pump 20. Specifically, the drive motor control unit 44 does not output an operation signal to the drive motor 21 until the corrected estimated cooling water temperature T C calculated by the estimated cooling water temperature correction unit 43 reaches a predetermined temperature (for example, 85 ° C.). . That is, when the engine 10 is warmed up, the circulation of the cooling water in the water jacket 13 is stopped so as to raise the temperature of the cooling water early. On the other hand, when the corrected estimated cooling water temperature T C calculated by the estimated cooling water temperature correction unit 43 becomes equal to or higher than a predetermined temperature (for example, 85 ° C.), the drive motor control unit 44 operates the operation signal according to the engine speed N and the fuel injection amount Q. Is output to the drive motor 21. That is, after the engine 10 is warmed up, the drive motor 21 is operated according to the operating state of the engine 10, and the cooling water is pumped and supplied by the electric water pump 20 according to the operating state of the engine 10. ing.

エンジン制御部４５は、エンジン回転数Ｎ、燃料噴射量Ｑ、冷却水温等を含むエンジン１０の運転状態を示すパラメータに基づいて、エンジン１０の燃料噴射量、燃料噴射圧、吸入空気量、多段燃料噴射制御等の各種制御を行う。このエンジン制御部４５は、推定冷却水温補正部４３により算出される補正推定冷却水温ＴCが所定温度（例えば８５℃）に達するまでは、この補正推定冷却水温ＴCをエンジン１０の各種制御に用いる。その後、補正推定冷却水温ＴCが所定温度（例えば８５℃）以上になると、エンジン制御部４５は、各種制御に用いる補正推定冷却水温ＴCを水温センサ１９の検出値（冷却水温ＴS）に切り替える。すなわち、電動ウォータポンプ２０が停止して冷却水循環も停止するエンジン暖機時は、ウォータジャケット１３内（すなわち、シリンダ壁面周辺）にある冷却水の補正推定冷却水温ＴCがエンジン１０の各種制御に用いられる一方、電動ウォータポンプ２０が駆動して冷却水も循環するエンジン暖機終了後は、より正確な値である水温センサ１９の検出値（冷却水温ＴS）がエンジン１０の各種制御に用いられるように構成されている。 The engine control unit 45 determines the fuel injection amount, fuel injection pressure, intake air amount, multistage fuel of the engine 10 based on parameters indicating the operating state of the engine 10 including the engine speed N, the fuel injection amount Q, the cooling water temperature, and the like. Various controls such as injection control are performed. The engine control unit 45 uses the corrected estimated cooling water temperature T C for various controls of the engine 10 until the corrected estimated cooling water temperature T C calculated by the estimated cooling water temperature correction unit 43 reaches a predetermined temperature (for example, 85 ° C.). Use. Thereafter, when the corrected estimated cooling water temperature T C becomes equal to or higher than a predetermined temperature (for example, 85 ° C.), the engine control unit 45 sets the corrected estimated cooling water temperature T C used for various controls to a detection value (cooling water temperature T S ) of the water temperature sensor 19. Switch. That is, when the engine warm-up electric water pump 20 is also stopped coolant circulation stops, the inner water jacket 13 (i.e., the cylinder wall near) correcting the estimated coolant temperature T C of the cooling water in the various controls of the engine 10 On the other hand, after the engine warm-up in which the electric water pump 20 is driven to circulate the cooling water, the detected value (cooling water temperature T S ) of the water temperature sensor 19 which is a more accurate value is used for various controls of the engine 10. It is configured to be.

次に、本実施形態に係るエンジンの制御装置１による制御フローを図２に基づいて説明する。なお、本制御はエンジン１０の始動（イグニッションスイッチのキースイッチＯＮ）と同時にスタートする。   Next, a control flow by the engine control apparatus 1 according to the present embodiment will be described with reference to FIG. This control starts simultaneously with the start of the engine 10 (key switch ON of the ignition switch).

ステップ（以下、ステップを単にＳと記載する）１００では、冷却水の水温を早期に上昇させるべく、電動ウォータポンプ２０の作動は停止状態に維持され、冷却水の循環も停止する。   In step (hereinafter, simply referred to as “S”) 100, the operation of the electric water pump 20 is maintained in a stopped state and the circulation of the cooling water is also stopped in order to increase the temperature of the cooling water early.

Ｓ１１０では、水温センサ１９の検出値である冷却水温ＴSが推定冷却水温演算部４２に読み込まれ、初期水温Ｔ0として保存される。 In S110, the cooling water temperature T S is the detection value of the water temperature sensor 19 is read in the estimated coolant temperature calculating unit 42, it is stored as the initial temperature T 0.

Ｓ１２０では、エンジン回転数Ｎ及び燃料噴射量Ｑが冷却水温上昇幅推定部４１に所定時間毎（例えば、１秒毎）に読み込まれると共に、ウォータジャケット１３内にある冷却水の水温上昇幅ΔＴが水温上昇マップに基づいて所定時間毎（例えば、１秒毎）に推定される。   In S120, the engine speed N and the fuel injection amount Q are read into the cooling water temperature increase width estimation unit 41 every predetermined time (for example, every second), and the water temperature increase width ΔT of the cooling water in the water jacket 13 is calculated. Based on the water temperature rise map, it is estimated every predetermined time (for example, every second).

Ｓ１３０では、冷却水温上昇幅推定部４１で所定時間毎（例えば、１秒毎）に推定される水温上昇幅ΔＴが推定冷却水温演算部４２に連続して読み込まれると共に、初期水温Ｔ0に各水温上昇幅ΔＴを積算することで推定冷却水温ＴEが連続的（所定時間毎）に算出される。 In S130, the water temperature increase ΔT estimated by the cooling water temperature increase width estimation unit 41 every predetermined time (for example, every second) is continuously read into the estimated cooling water temperature calculation unit 42, and each initial water temperature T 0 is set. The estimated cooling water temperature T E is calculated continuously (every predetermined time) by integrating the water temperature increase width ΔT.

Ｓ１４０では、推定冷却水温演算部４２で連続的に算出される推定冷却水温ＴEが推定冷却水温補正部４３に連続して読み込まれると共に、補正マップから読み取られた推定冷却水温ＴEと外気温ＴOUTとの温度差に対応する補正量に基づいて、補正推定冷却水温ＴCが連続的に算出される。 In S140, the estimated cooling water temperature T E continuously calculated by the estimated cooling water temperature calculation unit 42 is continuously read by the estimated cooling water temperature correction unit 43, and the estimated cooling water temperature T E and the outside air temperature read from the correction map are read. Based on the correction amount corresponding to the temperature difference from T OUT , the corrected estimated cooling water temperature T C is continuously calculated.

Ｓ１５０では、エンジン制御部４５により、エンジン回転数Ｎ、燃料噴射量Ｑ、補正推定冷却水温ＴC等を含むエンジン１０の運転状態を示すパラメータに基づいて、エンジン１０の燃料噴射量、燃料噴射圧、吸入空気量、多段燃料噴射制御等の各種制御が行われる。 In S150, the engine control unit 45 causes the fuel injection amount and fuel injection pressure of the engine 10 based on parameters indicating the operating state of the engine 10 including the engine speed N, the fuel injection amount Q, the corrected estimated cooling water temperature T C and the like. Various controls such as intake air amount and multistage fuel injection control are performed.

Ｓ１６０では、Ｓ１２０〜Ｓ１４０のステップで、所定時間毎に連続的に算出される補正推定冷却水温ＴCが所定温度（例えば８５℃）に達したか否かが確認される。補正推定冷却水温ＴCが所定温度（例えば８５℃）未満の場合はＳ１２０へと戻される。すなわち、電動ウォータポンプ２０の作動は停止状態に維持され、冷却水の循環も停止状態で維持される。一方、補正推定冷却水温ＴCが所定温度（例えば８５℃）以上の場合はＳ１７０へと進む。 In S160, it is confirmed in steps S120 to S140 whether or not the corrected estimated cooling water temperature T C continuously calculated every predetermined time has reached a predetermined temperature (for example, 85 ° C.). When the corrected estimated cooling water temperature T C is lower than a predetermined temperature (for example, 85 ° C.), the process returns to S120. That is, the operation of the electric water pump 20 is maintained in the stopped state, and the circulation of the cooling water is also maintained in the stopped state. On the other hand, when the corrected estimated cooling water temperature T C is equal to or higher than a predetermined temperature (for example, 85 ° C.), the process proceeds to S170.

Ｓ１７０では、駆動モータ制御部４４から、エンジン回転数Ｎや燃料噴射量Ｑに応じた作動信号が駆動モータ２１に出力される。すなわち、冷却水は電動ウォータポンプ２０によりエンジン１０の運転状態に応じて圧送供給される。   In S <b> 170, the drive motor control unit 44 outputs an operation signal corresponding to the engine speed N and the fuel injection amount Q to the drive motor 21. That is, the cooling water is pumped and supplied by the electric water pump 20 according to the operating state of the engine 10.

Ｓ１８０では、エンジン制御部４５により、エンジン１０の各種制御に用いられる推定冷却水温ＴEが水温センサ１９の検出値（冷却水温ＴS）に切り替えられて本制御はリターンされる。すなわち、電動ウォータポンプ２０が作動して冷却水が循環するエンジン暖機終了後は、より正確な値である水温センサ１９の検出値（冷却水温ＴS）がエンジン１０の各種制御に用いられる。 In S180, the engine control unit 45 switches the estimated cooling water temperature T E used for various controls of the engine 10 to the detection value (cooling water temperature T S ) of the water temperature sensor 19, and the present control is returned. That is, after the engine warm-up in which the electric water pump 20 is activated and the cooling water circulates, the detection value (cooling water temperature T S ) of the water temperature sensor 19 that is a more accurate value is used for various controls of the engine 10.

以上のような構成により、本実施形態に係るエンジンの制御装置１によれば以下のような作用効果を奏する。   With the above configuration, the engine control apparatus 1 according to the present embodiment has the following operational effects.

エンジン暖機時に冷却水循環が停止した場合、エンジン１０の運転状態に応じた冷却水の水温上昇幅ΔＴが推定されると共に、エンジン始動時の初期水温Ｔ0にこの水温上昇幅ΔＴを積算することで、シリンダ壁面温度と相関のあるウォータジャケット１３内の推定冷却水温ＴEが算出される。また、算出された推定冷却水温ＴEは外気温ＴOUTとの温度差に応じて補正され、伝熱を考慮した正確な補正推定冷却水温ＴCとして算出される。さらに、算出された補正推定冷却水温ＴCは、冷却水循環が停止している間、エンジン１０の燃料噴射量、燃料噴射圧、吸入空気量、多段燃料噴射制御等の各種制御を行うパラメータの一つとして用いられる。 When the circulation of the cooling water stops when the engine is warmed up, the water temperature increase width ΔT according to the operating state of the engine 10 is estimated, and the water temperature increase width ΔT is integrated into the initial water temperature T 0 at the time of starting the engine. in the estimated coolant temperature T E in the water jacket 13 which is correlated with the cylinder wall temperature is calculated. Further, the calculated estimated cooling water temperature T E is corrected according to the temperature difference from the outside air temperature T OUT and is calculated as an accurate corrected estimated cooling water temperature T C considering heat transfer. Furthermore, the calculated corrected estimated coolant temperature T C while the cooling water circulation is stopped, the fuel injection amount of the engine 10, fuel injection pressure, the intake air amount, one parameter that performs various controls of the multistage fuel injection control, etc. Used as one.

すなわち、冷却水循環が停止するエンジン暖機時は、水温センサ１９の検出値とシリンダ壁面温度との相関が成り立たない場合があるが、本実施形態のエンジンの制御装置１によれば、シリンダ壁面温度と相関のあるウォータジャケット１３内の正確な冷却水温が補正推定冷却水温ＴCとして算出され、エンジン１０の各種制御はこの補正推定冷却水温ＴCに基づいて適正に行われることになる。 That is, when the engine warms up when the coolant circulation stops, the correlation between the detected value of the water temperature sensor 19 and the cylinder wall surface temperature may not be established. However, according to the engine control apparatus 1 of the present embodiment, the cylinder wall surface temperature the exact cooling water temperature in the water jacket 13 having a correlation is calculated as a correction estimated coolant temperature T C, various controls of the engine 10 will be properly performed based on the corrected estimated coolant temperature T C and.

したがって、冷却水循環が停止した状態におけるエンジン１０の各種制御を精度良く最適化することが可能となり、排気ガス中のＮＯｘ濃度の悪化や、失火による燃焼の悪化を効果的に防止することができる。   Therefore, it is possible to optimize various controls of the engine 10 in a state where the circulation of the cooling water is stopped with high accuracy, and it is possible to effectively prevent the deterioration of NOx concentration in the exhaust gas and the deterioration of combustion due to misfire.

また、エンジン暖機時におけるエンジン１０の各種制御を最適化し、失火による燃焼悪化を防ぐことで、エンジン１０の燃費を効果的に向上することができる。   Further, by optimizing various controls of the engine 10 when the engine is warmed up and preventing deterioration of combustion due to misfire, the fuel efficiency of the engine 10 can be effectively improved.

なお、本発明は、上述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、適宜変形して実施することが可能である。   In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

例えば、上述の実施形態において、冷却水の圧送供給には、駆動モータ２１を備える電動ウォータポンプ２０を用いるものとして説明したが、エンジン１０を駆動源とするウォータポンプを用いてもよい。この場合、ウォータポンプの作動停止は電磁クラッチのＯＮ・ＯＦＦにより制御すればよい。   For example, in the above-described embodiment, it has been described that the electric water pump 20 including the drive motor 21 is used for the pumping supply of the cooling water, but a water pump using the engine 10 as a drive source may be used. In this case, the operation stop of the water pump may be controlled by ON / OFF of the electromagnetic clutch.

また、ＥＣＵ４０に予め記憶されている水温上昇マップを、冷却水が循環している時の水温センサ１９の検出値と、算出された推定冷却水温ＴEとの温度差に基づいて書き換える学習機能を付加してもよい。 Further, the water temperature rise map stored in advance in the ECU 40, and the detection value of the water temperature sensor 19 when the cooling water is circulated, rewritten on the basis of the temperature difference between the calculated estimated coolant temperature T E of the learning function It may be added.

１０ エンジン
１３ ウォータジャケット（冷却水回路）
１４ ラジエータ（冷却水回路）
１５ インレット配管（冷却水回路）
１６ アウトレット配管（冷却水回路）
１７ バイパス配管（冷却水回路）
１９ 水温センサ（冷却水温検出手段）
２２ エンジン回転センサ（運転状態検出手段）
２３ アクセル開度センサ（運転状態検出手段）
２４ 外気温センサ（外気温検出手段）
４１ 冷却水温上昇幅推定部
４２ 推定冷却水温演算部
４３ 推定冷却水温補正部
４５ エンジン制御部（運転状態制御部） 10 Engine 13 Water jacket (cooling water circuit)
14 Radiator (cooling water circuit)
15 Inlet piping (cooling water circuit)
16 Outlet piping (cooling water circuit)
17 Bypass piping (cooling water circuit)
19 Water temperature sensor (cooling water temperature detection means)
22 Engine rotation sensor (operating state detection means)
23 Accelerator opening sensor (operating state detection means)
24 Outside air temperature sensor (outside air temperature detecting means)
41 Cooling water temperature rise estimation unit 42 Estimated cooling water temperature calculation unit 43 Estimated cooling water temperature correction unit 45 Engine control unit (operation state control unit)

Claims (3)

ウォータジャケットを含む冷却水回路を備え、エンジン始動時から冷却水温が所定温度に上昇するまで前記ウォータジャケットの冷却水循環を停止させるエンジンの制御装置であって、
前記冷却水回路内の冷却水温を検出する冷却水温検出手段と、
少なくともエンジン回転数及び、燃料噴射量を含む前記エンジンの運転状態を検出する運転状態検出手段と、
前記運転状態検出手段により検出されるエンジンの運転状態に基づいて、冷却水の水温上昇幅を所定時間毎に推定する冷却水温上昇幅推定部と、
エンジン始動時における前記冷却水温検出手段の検出値を初期水温に設定し、該初期水温にエンジン始動時から所定期間経過時までに前記冷却水温上昇幅推定部により推定された各水温上昇幅を積算することで、該所定期間経過時の推定冷却水温を算出する推定冷却水温演算部と、
少なくとも前記運転状態検出手段の検出値及び、前記推定冷却水温演算部により算出される推定冷却水温に基づいて、前記エンジンの運転状態を制御する運転状態制御部と、を備えることを特徴とするエンジンの制御装置。 An engine control device comprising a cooling water circuit including a water jacket, and stopping the cooling water circulation of the water jacket until the cooling water temperature rises to a predetermined temperature from the start of the engine,
Cooling water temperature detecting means for detecting a cooling water temperature in the cooling water circuit;
An operating state detecting means for detecting an operating state of the engine including at least the engine speed and the fuel injection amount;
A cooling water temperature increase width estimation unit that estimates a water temperature increase width of the cooling water every predetermined time based on the operating state of the engine detected by the operating state detection means;
The detection value of the cooling water temperature detection means at the time of engine start is set to the initial water temperature, and the water temperature increase width estimated by the cooling water temperature increase width estimation unit is accumulated in the initial water temperature from the time of engine start until the elapse of a predetermined period. An estimated cooling water temperature calculation unit that calculates an estimated cooling water temperature when the predetermined period has elapsed,
An engine comprising: an operation state control unit configured to control an operation state of the engine based on at least a detection value of the operation state detection unit and an estimated cooling water temperature calculated by the estimated cooling water temperature calculation unit; Control device. 前記運転状態制御部は、
前記推定冷却水温演算部により算出される推定冷却水温が所定温度よりも高くなった場合は、前記推定冷却水温に切り替えて前記冷却水温検出手段の検出値を前記エンジンの運転状態の制御に用いる請求項１に記載のエンジンの制御装置。 The operating state control unit
When the estimated coolant temperature calculated by the estimated coolant temperature calculator is higher than a predetermined temperature, the estimated coolant temperature is switched to the estimated coolant temperature and the detected value of the coolant temperature detecting means is used for controlling the operating state of the engine. Item 4. The engine control device according to Item 1. 外気温を検出する外気温検出手段と、
前記推定冷却水温演算部により算出される推定冷却水温を、該推定冷却水温と前記外気温検出手段により検出された外気温との温度差に基づいて補正する推定冷却水温補正部と、をさらに備える請求項１又は２に記載のエンジンの制御装置。 An outside air temperature detecting means for detecting the outside air temperature;
An estimated cooling water temperature correcting unit that corrects the estimated cooling water temperature calculated by the estimated cooling water temperature calculating unit based on a temperature difference between the estimated cooling water temperature and the outside air temperature detected by the outside air temperature detecting unit; The engine control device according to claim 1 or 2.
JP2011157901A 2011-07-19 2011-07-19 Engine control device Expired - Fee Related JP5919664B2 (en)

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JP2014156849A (en) * 2013-02-18 2014-08-28 Toyota Motor Corp Control device of internal combustion engine
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