JP2015203307A - Pump control device - Google Patents

Pump control device Download PDF

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JP2015203307A
JP2015203307A JP2014081296A JP2014081296A JP2015203307A JP 2015203307 A JP2015203307 A JP 2015203307A JP 2014081296 A JP2014081296 A JP 2014081296A JP 2014081296 A JP2014081296 A JP 2014081296A JP 2015203307 A JP2015203307 A JP 2015203307A
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discharge amount
timing
fuel
metering valve
actual
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JP6221913B2 (en
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史隆 佐藤
Fumitaka Sato
史隆 佐藤
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Denso Corp
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Denso Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a pump control device which shortens time necessary for the learning of a discharge amount, in a fuel injection system which adjusts with an adjustment valve the adjustment timing at which a fuel supply pump starts or finish the pressure-sending of fuel in a pressure-sending stroke.SOLUTION: When a learning condition of a discharge amount is established (S400: Yes), a pump control device discharges fuel from a fuel supply pump by controlling an adjustment valve at command timing so that the discharge amount reaches a target discharge amount for the learning of the discharge amount (S402). An actual amount of the fuel supply pump is estimated from a rise amount of common rail pressure when the fuel supply pump discharges the fuel (S404), and the actual timing at which the adjustment valve is valve-closed is acquired on the basis of an actual discharge amount (S406). A difference between the command timing and the actual timing is calculated as a difference of angle timing (S408), and the command timing for controlling the adjustment valve from the next time is corrected with the difference of the angle timing as a correction value (S410).

Description

本発明は、圧送行程において燃料供給ポンプが燃料の圧送を開始または終了する調量タイミングを調量弁で調整して燃料供給ポンプの吐出量を調量し、燃料供給ポンプが吐出する燃料を蓄圧容器で蓄圧して燃料噴射弁から内燃機関の各気筒に噴射する燃料噴射システムに適用されるポンプ制御装置に関する。   The present invention adjusts the metering timing at which the fuel supply pump starts or ends fuel pumping in the pumping stroke with the metering valve to meter the discharge amount of the fuel supply pump, and accumulates the fuel discharged by the fuel supply pump. The present invention relates to a pump control device that is applied to a fuel injection system that accumulates pressure in a container and injects fuel into a cylinder of an internal combustion engine from a fuel injection valve.

燃料供給ポンプが吐出する燃料を蓄圧容器で蓄圧して燃料噴射弁から内燃機関の各気筒に噴射する燃料噴射システムにおいて、圧送行程において燃料供給ポンプが燃料の圧送を開始または終了する調量タイミングを調量弁で調整して燃料供給ポンプの吐出量を調量することが知られている。   In a fuel injection system in which fuel discharged from a fuel supply pump is stored in a pressure storage container and injected from a fuel injection valve into each cylinder of an internal combustion engine, a metering timing at which the fuel supply pump starts or ends pumping of fuel in a pumping stroke is set. It is known to adjust the discharge amount of a fuel supply pump by adjusting with a metering valve.

特許文献１に開示されている技術では、調量弁を閉弁させた状態で圧送行程を開始することにより燃料を加圧して吐出し、圧送行程の途中で調量弁を開弁して燃料吐出を終了する。圧送行程において、燃料供給ポンプは調量弁の閉弁期間で燃料を加圧して吐出するので、調量弁の開弁タイミングを調整することにより吐出量が調量される。   In the technique disclosed in Patent Document 1, fuel is pressurized and discharged by starting a pumping stroke with the metering valve closed, and the metering valve is opened in the middle of the pumping stroke. Discharge ends. In the pumping stroke, the fuel supply pump pressurizes and discharges the fuel during the valve closing period of the metering valve. Therefore, the discharge amount is metered by adjusting the valve opening timing of the metering valve.

圧送行程において燃料供給ポンプが燃料の圧送を終了または開始する調量タイミングを調量弁で調整して燃料供給ポンプの吐出量を調量する方式では、例えば内燃機関に燃料供給ポンプを取り付けるときの取付角度の誤差によりカム角度が基準位置からずれると、圧送を終了または開始する調量タイミングとして目標吐出量に応じた指令タイミングで調量弁を制御しても、実吐出量が目標吐出量からずれることがある。   In the method in which the fuel supply pump adjusts the metering timing at which the fuel supply pump ends or starts the fuel pumping by the metering valve in the pumping stroke, the discharge amount of the fuel supply pump is adjusted, for example, when the fuel supply pump is attached to the internal combustion engine. If the cam angle deviates from the reference position due to an error in the mounting angle, the actual discharge amount will not be the same as the target discharge amount even if the metering valve is controlled at the command timing corresponding to the target discharge amount as the metering timing to end or start pumping. It may shift.

そこで、特許文献１に開示される技術では、吐出量の学習時において、調量弁を閉弁状態から開弁させるタイミングを圧送行程の開始前から徐々に遅らせていき、蓄圧容器内の燃料圧力が変化するタイミングを検出する。この検出されたタイミングと、カム角度の基準位置からのずれであるカム角度誤差がない場合に蓄圧容器内の燃料圧力が変化すると予め実験等によって求めておいた基準タイミングとの差からカム角度誤差を算出し、カム角度誤差に基づいて調量弁を駆動する駆動信号を補正している。   Therefore, in the technique disclosed in Patent Document 1, when learning the discharge amount, the timing for opening the metering valve from the closed state is gradually delayed before the start of the pumping stroke, so that the fuel pressure in the pressure accumulating vessel is increased. The timing at which changes. If there is no cam angle error, which is a deviation from the reference position of the cam angle, the cam angle error is determined from the difference between the detected reference timing and the reference timing previously determined by experiment or the like when the fuel pressure in the pressure accumulator changes. And the drive signal for driving the metering valve is corrected based on the cam angle error.

特開２００６−１９４１７７号公報JP 2006-194177 A

特許文献１に開示される技術では、蓄圧容器内の燃料圧力が変化するまで調量弁を閉弁状態から開弁させるタイミングを徐々に遅らせて繰り返し制御する必要があるので、学習が完了するまでに要する時間が長くなるという問題がある。   In the technique disclosed in Patent Document 1, it is necessary to gradually control the timing of opening the metering valve from the closed state until the fuel pressure in the pressure accumulator changes. There is a problem that the time required for the process becomes longer.

本発明は上記課題を解決するためになされたものであり、圧送行程において燃料供給ポンプが燃料の圧送を開始または終了する調量タイミングを調量弁で調整する燃料噴射システムにおいて、吐出量学習に要する時間を短縮するポンプ制御装置を提供することを目的とする。   The present invention has been made to solve the above-described problem, and in a fuel injection system in which a metering valve adjusts a metering timing at which a fuel supply pump starts or ends fuel pumping in a pumping stroke, a discharge amount learning is performed. An object of the present invention is to provide a pump control device that shortens the time required.

本発明のポンプ制御装置は、圧送行程において燃料供給ポンプが燃料の圧送を開始または終了する調量タイミングを調量弁で調整して燃料供給ポンプの吐出量を調量し、燃料供給ポンプが吐出する燃料を蓄圧容器で蓄圧して燃料噴射弁から内燃機関の各気筒に噴射する燃料噴射システムに適用されるポンプ制御装置であって、調量弁制御手段と、吐出量推定手段と、補正手段と、を備える。   The pump control device of the present invention adjusts the metering timing at which the fuel supply pump starts or ends fuel pumping in the pumping stroke with the metering valve, and regulates the discharge amount of the fuel supply pump. A pump control device applied to a fuel injection system for accumulating fuel to be accumulated in a pressure accumulating container and injecting the fuel from a fuel injection valve into each cylinder of an internal combustion engine, a metering valve control means, a discharge amount estimation means, and a correction means And comprising.

調量弁制御手段は、調量タイミングとして目標吐出量に応じた指令タイミングに基づいて調量弁を制御し、吐出量推定手段は、所定の学習条件が成立して調量弁制御手段が吐出量学習用の指令タイミングに基づいて調量弁を制御するときの燃料供給ポンプの実吐出量を、実吐出量に関連する物理量に基づいて推定する。   The metering valve control unit controls the metering valve based on a command timing corresponding to the target discharge amount as the metering timing, and the discharge amount estimation unit discharges the metering valve control unit when a predetermined learning condition is satisfied. The actual discharge amount of the fuel supply pump when the metering valve is controlled based on the command timing for amount learning is estimated based on the physical quantity related to the actual discharge amount.

補正手段は、吐出量学習用の指令タイミングに基づいて調量弁が制御されるときの目標吐出量と吐出量推定手段が推定する実吐出量との差に基づいて指令タイミングを補正する。   The correction unit corrects the command timing based on a difference between the target discharge amount when the metering valve is controlled based on the command timing for discharge amount learning and the actual discharge amount estimated by the discharge amount estimation unit.

ここで、吐出量学習用の指令タイミングに基づいて調量弁が制御されるときの目標吐出量と実吐出量との差は、燃料供給ポンプの製造ばらつきおよび経時変化により生じる調量弁のばらつきおよび摩耗等による流量の変化、内燃機関に燃料供給ポンプを取り付けるときの取付角度の誤差により生じるカム角度の基準位置からのずれ、ならびに燃料性状の違いによる粘性の違いなどにより生じる。   Here, the difference between the target discharge amount and the actual discharge amount when the metering valve is controlled based on the command timing for the discharge amount learning is the variation in the fuel supply pump manufacturing and the variation in the metering valve caused by changes over time. This is caused by a change in flow rate due to wear or the like, a cam angle shift due to an error in the mounting angle when the fuel supply pump is attached to the internal combustion engine, and a difference in viscosity due to a difference in fuel properties.

そこで、調量弁を制御するときの目標吐出量に応じた指令タイミングを、吐出量学習用の指令タイミングに基づいて調量弁を制御したときの目標吐出量と実吐出量との差に基づいて補正することにより、実吐出量を目標吐出量に調量することができる。   Therefore, the command timing corresponding to the target discharge amount when controlling the metering valve is based on the difference between the target discharge amount and the actual discharge amount when controlling the metering valve based on the command timing for discharge amount learning. Thus, the actual discharge amount can be adjusted to the target discharge amount.

実吐出量は、目標吐出量に応じた指令タイミングに基づいて調量弁が制御されるときの実吐出量に関連する物理量に基づいて推定できる。これにより、指令タイミングを変えて調量弁を繰り返し制御することなく、目標吐出量と実吐出量と差に基づいて指令タイミングを補正するので、吐出量学習に要する時間を短縮できる。   The actual discharge amount can be estimated based on a physical quantity related to the actual discharge amount when the metering valve is controlled based on the command timing corresponding to the target discharge amount. As a result, the command timing is corrected based on the difference between the target discharge amount and the actual discharge amount without repeatedly controlling the metering valve by changing the command timing, so that the time required for learning the discharge amount can be shortened.

所定の学習条件として、燃料噴射弁が燃料を噴射しない無噴射運転時を設定することが望ましい。これにより、燃料供給ポンプが吐出する実吐出量以外に燃料噴射システムの燃料流量を変化させる要因を排除して、高精度に実噴射量を推定できる。   As the predetermined learning condition, it is desirable to set the non-injection operation time in which the fuel injection valve does not inject fuel. Thereby, in addition to the actual discharge amount discharged by the fuel supply pump, the factor that changes the fuel flow rate of the fuel injection system can be eliminated, and the actual injection amount can be estimated with high accuracy.

本実施形態による燃料噴射システムを示すブロック図。The block diagram which shows the fuel-injection system by this embodiment. カムの回転角度とプランジャのリフト量との関係を示す特性図。The characteristic view which shows the relationship between the rotation angle of a cam, and the lift amount of a plunger. 吐出量学習の前後における実吐出量を示すタイムチャート。The time chart which shows the actual discharge amount before and after discharge amount learning. 吐出量学習処理を示すフローチャート。The flowchart which shows a discharge amount learning process.

以下、本発明の実施の形態を図に基づいて説明する。図１に示す蓄圧式の燃料噴射システム１０は、燃料供給ポンプ２０、コモンレール３０、燃料噴射弁４０、ＥＣＵ（Electronic Control Unit）５０等から構成されており、内燃機関として４気筒のディーゼルエンジン（以下、単に「エンジン」とも言う。）２に燃料を噴射するものである。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. An accumulator fuel injection system 10 shown in FIG. 1 includes a fuel supply pump 20, a common rail 30, a fuel injection valve 40, an ECU (Electronic Control Unit) 50, and the like, and a four-cylinder diesel engine (hereinafter referred to as an internal combustion engine). , Which is also simply referred to as “engine”).

燃料供給ポンプ２０は、燃料タンク１２から燃料を汲み上げるフィードポンプを内蔵している。燃料供給ポンプ２０は、カムシャフトのカムの回転に伴いプランジャが駆動されて往復移動することにより、フィードポンプから加圧室に吸入した燃料を加圧する公知のポンプである。燃料供給ポンプ２０の吐出量は調量弁２２で調量される。   The fuel supply pump 20 incorporates a feed pump that pumps fuel from the fuel tank 12. The fuel supply pump 20 is a known pump that pressurizes the fuel sucked into the pressurizing chamber from the feed pump by reciprocating the plunger driven by the rotation of the camshaft cam. The discharge amount of the fuel supply pump 20 is metered by a metering valve 22.

コモンレール３０は、燃料供給ポンプ２０から吐出される燃料を蓄圧する中空の蓄圧容器である。コモンレール３０には、内部の燃料圧力（コモンレール圧）を検出する圧力センサ３２、および、コモンレール圧が所定圧を超えると開弁してコモンレール３０内の燃料を排出するプレッシャリミッタ３４が設けられている。   The common rail 30 is a hollow pressure accumulating container that accumulates fuel discharged from the fuel supply pump 20. The common rail 30 is provided with a pressure sensor 32 that detects internal fuel pressure (common rail pressure), and a pressure limiter 34 that opens when the common rail pressure exceeds a predetermined pressure and discharges fuel in the common rail 30. .

エンジン２には、運転状態を検出するセンサとして、クランク軸の回転角度であるクランク角度を検出するクランクセンサ４２が設置されている。さらに、運転状態を検出する他のセンサとして、運転者によるアクセルペダルの操作量であるアクセル開度（ＡＣＣＰ）を検出するアクセルセンサ、吸入空気の温度（吸気温）と燃料温度（燃温）とをそれぞれ検出する温度センサ等が燃料噴射システム１０に設けられている。   The engine 2 is provided with a crank sensor 42 for detecting a crank angle, which is a rotation angle of the crankshaft, as a sensor for detecting an operation state. Further, as other sensors for detecting the driving state, an accelerator sensor for detecting an accelerator opening (ACCP) which is an operation amount of an accelerator pedal by a driver, an intake air temperature (intake air temperature) and a fuel temperature (fuel temperature) The fuel injection system 10 is provided with a temperature sensor or the like for detecting each of these.

燃料噴射弁４０は、エンジン２の各気筒に設置されており、コモンレール３０で蓄圧された燃料を気筒内に噴射する。燃料噴射弁４０は、噴孔を開閉するノズルニードルのリフトを制御室の圧力で制御しており、燃料噴射弁４０が作動していないときに高圧燃料の低圧側への静リーク量が生じないリークレス構造を採用している。燃料噴射弁４０の噴射量は、ＥＣＵ５０から指令される噴射指令信号のパルス幅によって制御される。噴射指令信号のパルス幅が長くなると噴射量が増加する。   The fuel injection valve 40 is installed in each cylinder of the engine 2 and injects fuel accumulated in the common rail 30 into the cylinder. The fuel injection valve 40 controls the lift of the nozzle needle that opens and closes the nozzle hole with the pressure in the control chamber, and when the fuel injection valve 40 is not operating, no static leak amount of high pressure fuel to the low pressure side occurs. A leakless structure is adopted. The injection amount of the fuel injection valve 40 is controlled by the pulse width of the injection command signal commanded from the ECU 50. As the pulse width of the injection command signal increases, the injection amount increases.

機能するＥＣＵ５０は、ＣＰＵ、ＲＡＭ、ＲＯＭ、フラッシュメモリ等を中心とするマイクロコンピュータを搭載している。ＥＣＵ５０は、ＲＯＭまたはフラッシュメモリに記憶されている制御プログラムをＣＰＵが実行することにより、圧力センサ３２、クランクセンサ４２を含む各種センサから取り込んだ出力信号に基づき、燃料噴射システム１０の各種制御を実行する。   The functioning ECU 50 is equipped with a microcomputer centering on a CPU, RAM, ROM, flash memory and the like. The ECU 50 executes various control of the fuel injection system 10 based on output signals taken from various sensors including the pressure sensor 32 and the crank sensor 42 by the CPU executing a control program stored in the ROM or the flash memory. To do.

例えば、ＥＣＵ５０は、圧力センサ３２が検出するコモンレール圧が目標圧になるように調量弁２２を制御して燃料供給ポンプ２０の吐出量を調量する。   For example, the ECU 50 controls the metering valve 22 so that the common rail pressure detected by the pressure sensor 32 becomes the target pressure, thereby metering the discharge amount of the fuel supply pump 20.

具体的には、ＥＣＵ５０は、コモンレール圧の目標圧と圧力センサ３２が検出する実圧との差に基づいて、実圧が目標圧となるように燃料供給ポンプ２０の目標吐出量を算出する。ＥＣＵ５０は、燃料供給ポンプ２０の吐出量とカムの回転角度との相関を示すマップをＲＯＭまたはフラッシュメモリに記憶している。   Specifically, the ECU 50 calculates the target discharge amount of the fuel supply pump 20 based on the difference between the target pressure of the common rail pressure and the actual pressure detected by the pressure sensor 32 so that the actual pressure becomes the target pressure. The ECU 50 stores a map indicating the correlation between the discharge amount of the fuel supply pump 20 and the cam rotation angle in a ROM or flash memory.

ＥＣＵ５０は、目標吐出量となるように、圧縮行程において調量弁２２を閉弁して燃料供給ポンプ２０が吐出を開始する調量タイミングを調量弁２２に対する指令タイミングとしてマップから取得する。調量タイミング、指令タイミング、および後述する実タイミングは、クランクセンサ４２が検出するクランク角度で表わされるカムの回転角度に同期した角度タイミングである。ＥＣＵ５０は、マップから取得した指令タイミングで閉弁するように調量弁２２を制御し、吐出量を目標吐出量に調量する。   The ECU 50 acquires, from the map, a metering timing at which the fuel supply pump 20 starts discharging by closing the metering valve 22 in the compression stroke so as to reach the target discharge amount as a command timing for the metering valve 22. The metering timing, the command timing, and the actual timing described later are angle timings synchronized with the cam rotation angle represented by the crank angle detected by the crank sensor 42. The ECU 50 controls the metering valve 22 so as to close at the command timing acquired from the map, and regulates the discharge amount to the target discharge amount.

また、ＥＣＵ５０は、燃料噴射弁４０に噴射を指令する噴射指令信号のパルス幅（Ｔ）と噴射量（Ｑ）との相関を示す所謂ＴＱマップを、コモンレール圧の所定の圧力範囲毎にＲＯＭまたはフラッシュメモリに記憶している。そして、ＥＣＵ５０は、エンジン回転数およびアクセル開度に基づいて燃料噴射弁４０の噴射量が決定されると、圧力センサ３２が検出したコモンレール圧に応じて該当する圧力範囲のＴＱマップを参照し、燃料噴射弁４０に決定された噴射量を指令する噴射指令信号のパルス幅をＴＱマップから取得する。   Further, the ECU 50 stores a so-called TQ map indicating the correlation between the pulse width (T) of the injection command signal for instructing the fuel injection valve 40 and the injection amount (Q) for each predetermined pressure range of the common rail pressure in the ROM or Stored in flash memory. Then, when the injection amount of the fuel injection valve 40 is determined based on the engine speed and the accelerator opening, the ECU 50 refers to the TQ map of the corresponding pressure range according to the common rail pressure detected by the pressure sensor 32, The pulse width of the injection command signal that commands the injection amount determined for the fuel injection valve 40 is acquired from the TQ map.

（吐出量学習）
ＥＣＵ５０は、燃料供給ポンプ２０の目標吐出量に対応した調量弁２２に対する指令タイミングをマップから取得し、圧送行程において調量弁２２を開弁状態から指令タイミングで閉弁させることにより、燃料供給ポンプ２０の加圧室の燃料を加圧して吐出を開始させる。指令タイミングからカムプロフィールのトップまで、つまりプランジャが上死点に達するまでの期間で燃料が吐出されるので、指令タイミングにより吐出量が決定される。 (Discharge amount learning)
The ECU 50 acquires the command timing for the metering valve 22 corresponding to the target discharge amount of the fuel supply pump 20 from the map, and closes the metering valve 22 from the open state at the command timing in the pressure feed stroke, thereby supplying the fuel. The fuel in the pressurizing chamber of the pump 20 is pressurized and discharge is started. Since fuel is discharged from the command timing to the top of the cam profile, that is, until the plunger reaches top dead center, the discharge amount is determined by the command timing.

エンジン２に燃料供給ポンプ２０を取り付けるときの取付角度の誤差によりカム角度が基準位置から角度θずれると、図２に示すように、指令タイミングで調量弁２２を閉弁させても、調量タイミングとして実際に調量弁２２が閉弁する実タイミングはカム角度の基準位置からのずれであるカム角度誤差（θ）だけずれる。したがって、実吐出量は目標吐出量からずれる。   If the cam angle deviates from the reference position by the angle θ due to an error in the mounting angle when the fuel supply pump 20 is mounted on the engine 2, as shown in FIG. 2, even if the metering valve 22 is closed at the command timing, the metering As the timing, the actual timing at which the metering valve 22 is actually closed is shifted by the cam angle error (θ), which is a deviation from the reference position of the cam angle. Therefore, the actual discharge amount deviates from the target discharge amount.

ここで、コモンレール圧は、コモンレール３０に流入する燃料流量とコモンレール３０から流出する燃料流量との収支に応じて上昇または低下する。燃料供給ポンプ２０が燃料を吐出すると、吐出量に応じてコモンレール圧は上昇する。したがって、実吐出量に関連する物理量として、コモンレール圧の上昇量から燃料ポンプ２０の実吐出量を推定できる。   Here, the common rail pressure increases or decreases according to the balance between the fuel flow rate flowing into the common rail 30 and the fuel flow rate flowing out from the common rail 30. When the fuel supply pump 20 discharges the fuel, the common rail pressure increases according to the discharge amount. Therefore, the actual discharge amount of the fuel pump 20 can be estimated from the increase amount of the common rail pressure as a physical quantity related to the actual discharge amount.

推定された実吐出量から圧送行程において調量弁２２が閉弁した実タイミングをマップから取得し、指令タイミングと実タイミングとの差である角度タイミングの差（θ）を、カム角度誤差として求めることができる。図３に示すように、この角度タイミングの差（θ）に基づいて調量弁２２に対する指令タイミングを補正することにより、実吐出量を目標吐出量に調量できる。   The actual timing at which the metering valve 22 is closed in the pumping stroke is acquired from the estimated actual discharge amount from the map, and the angle timing difference (θ) that is the difference between the command timing and the actual timing is obtained as the cam angle error. be able to. As shown in FIG. 3, the actual discharge amount can be adjusted to the target discharge amount by correcting the command timing for the metering valve 22 based on the difference (θ) in the angle timing.

ここで、指令タイミングと実タイミングとの角度タイミングの差は、目標吐出量と実吐出量とのずれにより生じる。そして、目標吐出量と実吐出量とのずれは、エンジン２に燃料供給ポンプ２０を取り付けるときの取付角度の誤差により生じるカム角度誤差だけでなく、調量弁２２の製造ばらつきおよび経時変化による流量のずれ、燃料性状の違いによる粘性の違いなどによっても生じる。   Here, the difference in the angle timing between the command timing and the actual timing is caused by a difference between the target discharge amount and the actual discharge amount. The deviation between the target discharge amount and the actual discharge amount is not only a cam angle error caused by an attachment angle error when the fuel supply pump 20 is attached to the engine 2, but also a flow rate due to manufacturing variation and change with time of the metering valve 22. This also occurs due to differences in viscosity due to differences in fuel properties and fuel properties.

そこで、指令タイミングと実タイミングとの角度タイミングの差で指令タイミングを補正することにより、カム角度誤差だけでなく、調量弁２２の製造ばらつきおよび経時変化による流量のずれ、燃料性状の違いによる粘性の違いなどによっても生じる目標吐出量と実吐出量とのずれを解消し、実吐出量を目標吐出量に調量できる。   Therefore, by correcting the command timing with the difference in angle timing between the command timing and the actual timing, not only the cam angle error, but also the manufacturing variation of the metering valve 22 and the flow rate deviation due to aging, the viscosity due to the difference in fuel properties The difference between the target discharge amount and the actual discharge amount caused by the difference between the actual discharge amount and the actual discharge amount can be adjusted to the target discharge amount.

尚、指令タイミングに基づいて駆動電流により流調量弁２２を制御する場合、図３に示すように、調量弁２２の閉弁応答遅れ時間を考慮し、指令タイミングよりも閉弁応答遅れ時間前に駆動電流により調量弁２２に閉弁を指令している。   When the flow metering valve 22 is controlled by the drive current based on the command timing, as shown in FIG. 3, the valve closing response delay time of the metering valve 22 is taken into consideration, as shown in FIG. Previously, the metering valve 22 is instructed to close by the drive current.

次に、吐出量の学習処理を図４のフローチャートに基づいて説明する。図４において「Ｓ」はステップを表わしている。   Next, the discharge amount learning process will be described with reference to the flowchart of FIG. In FIG. 4, “S” represents a step.

Ｓ４００においてＥＣＵ５０は、吐出量の所定の学習条件が成立しているか否かを判定する。ＥＣＵ５０は、以下の条件（１）〜（４）がすべて成立すると所定の学習条件が成立していると判定する。
（１）燃料噴射弁４０から燃料が噴射されない無噴射減速運転時
（２）所定の走行距離間隔
（３）バッテリ電圧が所定電圧以上
（４）燃料温度（燃温）が所定温度以上
学習条件が成立していない場合（Ｓ４００：Ｎｏ）、ＥＣＵ５０は本処理を終了する。学習条件が成立している場合（Ｓ４００：Ｙｅｓ）、ＥＣＵ５０は吐出量学習用の目標吐出量となるように、調量タイミングとしてマップから取得した指令タイミングで閉弁するように調量弁２２を制御し燃料供給ポンプ２０から燃料を吐出させる（Ｓ４０２）。 In S400, the ECU 50 determines whether or not a predetermined learning condition for the discharge amount is satisfied. The ECU 50 determines that a predetermined learning condition is satisfied when all of the following conditions (1) to (4) are satisfied.
(1) During non-injection deceleration operation in which fuel is not injected from the fuel injection valve 40 (2) Predetermined travel distance interval (3) Battery voltage is above a predetermined voltage (4) Fuel temperature (fuel temperature) is above a predetermined temperature Learning conditions are If not established (S400: No), the ECU 50 ends this process. When the learning condition is satisfied (S400: Yes), the ECU 50 sets the metering valve 22 to close at the command timing acquired from the map as the metering timing so that the target discharge amount for the discharge amount learning is obtained. The fuel is controlled and discharged from the fuel supply pump 20 (S402).

ここで、図２に示すように、下死点および上死点付近では、下死点と上死点との中間付近に比べ、回転角度に対してプランジャのリフト量の変化率が小さいので、燃料供給ポンプ２０の吐出量およびコモンレール圧の変化率も小さい。回転角度に対するコモンレール圧の変化率が小さいと、コモンレール圧の変化量から指令タイミングと実タイミングとの差を高精度に検出できない。   Here, as shown in FIG. 2, the change rate of the lift amount of the plunger with respect to the rotation angle is smaller in the vicinity of the bottom dead center and the top dead center than in the vicinity of the middle between the bottom dead center and the top dead center. The discharge rate of the fuel supply pump 20 and the change rate of the common rail pressure are also small. If the change rate of the common rail pressure with respect to the rotation angle is small, the difference between the command timing and the actual timing cannot be detected with high accuracy from the change amount of the common rail pressure.

そこで、本実施形態では、下死点および上死点付近ではなく、回転角度に対する燃料供給ポンプ２０の吐出量の変化率が所定値以上の角度範囲内で吐出量学習時の指令タイミングをマップから取得している。   Therefore, in the present embodiment, the command timing at the time of learning the discharge amount is determined from the map within the angle range where the change rate of the discharge amount of the fuel supply pump 20 with respect to the rotation angle is not less than a predetermined value, not near the bottom dead center and the top dead center. Have acquired.

ＥＣＵ５０は、燃料供給ポンプ２０が吐出したときのコモンレール圧の上昇量から燃料供給ポンプ２０の実吐出量を推定し（Ｓ４０４）、実吐出量に基づいて調量弁２２が閉弁する実タイミングをマップから取得する（Ｓ４０６）。そして、指令タイミングと実タイミングとの差を角度タイミングの差として算出する（Ｓ４０８）。ＥＣＵ５０は、角度タイミングの差を補正値として次回から調量弁２２を制御する指令タイミングを補正する（Ｓ４１０）。   The ECU 50 estimates the actual discharge amount of the fuel supply pump 20 from the increase amount of the common rail pressure when the fuel supply pump 20 discharges (S404), and sets the actual timing at which the metering valve 22 is closed based on the actual discharge amount. Obtained from the map (S406). Then, the difference between the command timing and the actual timing is calculated as the angle timing difference (S408). The ECU 50 corrects the command timing for controlling the metering valve 22 from the next time using the difference in angle timing as a correction value (S410).

以上説明した本実施形態によると、吐出量学習用の指令タイミングに基づいて調量弁２２が制御されるときの目標吐出量と実吐出量との差を指令タイミングと実タイミングとの差として求め、この角度タイミングの差を補正値として指令タイミングを補正している。   According to the present embodiment described above, the difference between the target discharge amount and the actual discharge amount when the metering valve 22 is controlled based on the discharge amount learning command timing is obtained as the difference between the command timing and the actual timing. The command timing is corrected using the difference in angle timing as a correction value.

これにより、吐出量学習時に指令タイミングを変化させて調量弁２２を繰り返し制御することなく、吐出量学習に要する時間を短縮して指令タイミングを補正できる。   Thus, the command timing can be corrected by shortening the time required for the discharge amount learning without changing the command timing during the discharge amount learning and repeatedly controlling the metering valve 22.

さらに、吐出量学習時に調量弁２２を制御する指令タイミングを、回転角度に対するコモンレール圧の変化率が所定値以上の角度範囲内に設定するので、コモンレール圧の変化量に基づいて高精度に指令タイミングを補正できる。   Furthermore, the command timing for controlling the metering valve 22 during the learning of the discharge amount is set within an angle range in which the change rate of the common rail pressure with respect to the rotation angle is equal to or greater than a predetermined value, so the command can be commanded with high accuracy based on the change amount of the common rail pressure. The timing can be corrected.

さらに、所定の学習条件として、燃料噴射弁４０が燃料を噴射しない無噴射運転時に吐出量学習を行うので、コモンレール３０に流入およびコモンレール３０から流出する燃料流量の収支から燃料噴射弁４０の噴射量を排除できる。これにより、コモンレール圧の変化量から、燃料供給ポンプ２０の実吐出量を高精度に推定できる。   Further, since the discharge amount learning is performed as the predetermined learning condition during the non-injection operation in which the fuel injection valve 40 does not inject fuel, the injection amount of the fuel injection valve 40 is calculated from the balance of the fuel flow rate flowing into and out of the common rail 30. Can be eliminated. Thereby, the actual discharge amount of the fuel supply pump 20 can be estimated with high accuracy from the change amount of the common rail pressure.

そして、補正した指令タイミングで調量弁２２を制御することにより、エンジン２に燃料供給ポンプ２０を取り付けるときの取付角度の誤差により生じるカム角度誤差、調量弁２２の製造ばらつきおよび経時変化による流量のずれ、燃料性状の違いによる粘性の違いなどにより生じる目標吐出量と実吐出量との差を補正して、実吐出量を目標吐出量に調量できる。   Then, by controlling the metering valve 22 at the corrected command timing, the cam angle error caused by the mounting angle error when the fuel supply pump 20 is mounted to the engine 2, the manufacturing variation of the metering valve 22, and the flow rate due to changes over time. It is possible to adjust the actual discharge amount to the target discharge amount by correcting the difference between the target discharge amount and the actual discharge amount caused by the difference in the viscosity and the difference in the viscosity due to the difference in fuel properties.

［他の実施形態］
上記実施形態では、圧縮行程において調量弁２２を閉弁させて燃料吐出を開始する調量タイミングを調整することにより燃料供給ポンプ２０の吐出量を制御する調量方式を採用した。これに対し、圧縮行程において調量弁２２を開弁させて燃料吐出を終了する調量タイミングを調整することにより燃料供給ポンプ２０の吐出量を制御する方式に、本発明の吐出量学習を適用してもよい。 [Other Embodiments]
In the above-described embodiment, a metering method is adopted in which the discharge amount of the fuel supply pump 20 is controlled by adjusting the metering timing when the metering valve 22 is closed in the compression stroke to start fuel discharge. In contrast, the discharge amount learning of the present invention is applied to a method of controlling the discharge amount of the fuel supply pump 20 by adjusting the metering timing at which the fuel discharge is terminated by opening the metering valve 22 in the compression stroke. May be.

本発明では、通常運転時に、燃料噴射弁４０が燃料を噴射しない無噴射運転時を除く上記の学習条件（２）〜（４）がすべて成立すると、吐出量学習を実行してもよい。この場合、コモンレール圧の変化量に基づいて、コモンレール３０に流入およびコモンレール３０から流出する燃料流量の収支を推定し、燃料流量の収支から燃料噴射弁４０の噴射量を除いた燃料流量を燃料供給ポンプ２０の実吐出量として推定することができる。   In the present invention, during the normal operation, the discharge amount learning may be executed when all of the learning conditions (2) to (4) are satisfied except during the non-injection operation in which the fuel injection valve 40 does not inject fuel. In this case, the balance of the fuel flow rate flowing into and out of the common rail 30 is estimated based on the change amount of the common rail pressure, and the fuel flow rate obtained by excluding the injection amount of the fuel injection valve 40 from the fuel flow rate balance is supplied as fuel. It can be estimated as the actual discharge amount of the pump 20.

このように、本発明は、上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の実施形態に適用可能である。   As described above, the present invention is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.

２：エンジン（内燃機関）、１０：燃料噴射システム、２０：燃料供給ポンプ、２２：調量弁、３０：コモンレール（蓄圧容器）、３２：圧力センサ、４０：燃料噴射弁、５０：ＥＣＵ（ポンプ制御装置、調量弁制御手段、吐出量推定手段、タイミング取得手段、補正手段） 2: engine (internal combustion engine), 10: fuel injection system, 20: fuel supply pump, 22: metering valve, 30: common rail (accumulation vessel), 32: pressure sensor, 40: fuel injection valve, 50: ECU (pump Control device, metering valve control means, discharge amount estimation means, timing acquisition means, correction means)

Claims (5)

圧送行程において燃料供給ポンプ（２０）が燃料の圧送を開始または終了する調量タイミングを調量弁（２２）で調整して前記燃料供給ポンプの吐出量を調量し、前記燃料供給ポンプが吐出する燃料を蓄圧容器（３０）で蓄圧して燃料噴射弁（４０）から内燃機関（２）の各気筒に噴射する燃料噴射システム（１０）に適用されるポンプ制御装置（５０）であって、
前記調量タイミングとして目標吐出量に応じた指令タイミングに基づいて前記調量弁を制御する調量弁制御手段（Ｓ４００、Ｓ４０２）と、
所定の学習条件が成立して前記調量弁制御手段が吐出量学習用の前記指令タイミングに基づいて前記調量弁を制御するときの前記燃料供給ポンプの実吐出量を、前記実吐出量に関連する物理量に基づいて推定する吐出量推定手段（Ｓ４０４）と、
吐出量学習用の前記指令タイミングに基づいて前記調量弁が制御されるときの前記目標吐出量と前記吐出量推定手段が推定する前記実吐出量との差に基づいて前記指令タイミングを補正する補正手段（Ｓ４１０）と、
を備えることを特徴とするポンプ制御装置。 The metering valve (22) adjusts the metering timing at which the fuel supply pump (20) starts or ends fuel pumping in the pumping stroke to regulate the discharge amount of the fuel supply pump, and the fuel supply pump discharges the fuel. A pump control device (50) applied to a fuel injection system (10) for accumulating fuel to be accumulated in a pressure accumulating vessel (30) and injecting the fuel from a fuel injection valve (40) to each cylinder of an internal combustion engine (2),
A metering valve control means (S400, S402) for controlling the metering valve based on a command timing corresponding to a target discharge amount as the metering timing;
The actual discharge amount of the fuel supply pump when the predetermined learning condition is satisfied and the metering valve control means controls the metering valve based on the command timing for discharge amount learning is set to the actual discharge amount. A discharge amount estimating means (S404) for estimating based on a related physical quantity;
The command timing is corrected based on a difference between the target discharge amount when the metering valve is controlled based on the command timing for discharge amount learning and the actual discharge amount estimated by the discharge amount estimating means. Correction means (S410);
A pump control device comprising: 前記調量弁制御手段は、前記所定の学習条件として、前記燃料噴射弁が燃料を噴射しない無噴射運転時に、吐出量学習用の前記指令タイミングに基づいて前記調量弁を制御することを特徴とする請求項１に記載のポンプ制御装置。   The metering valve control means controls the metering valve as the predetermined learning condition based on the command timing for discharge amount learning during a non-injection operation in which the fuel injector does not inject fuel. The pump control device according to claim 1. 前記吐出量推定手段は、前記物理量として前記蓄圧容器から前記燃料噴射弁に供給される燃料圧力の変化量に基づいて前記実吐出量を推定することを特徴とする請求項１または２に記載のポンプ制御装置。   The said discharge amount estimation means estimates the said actual discharge amount based on the variation | change_quantity of the fuel pressure supplied to the said fuel injection valve from the said pressure accumulation container as the said physical quantity, The Claim 1 or 2 characterized by the above-mentioned. Pump control device. 前記実吐出量に基づいて前記調量タイミングの実タイミングを取得するタイミング取得手段（Ｓ４０６）を備え、
前記補正手段は、前記指令タイミングと前記タイミング取得手段が取得する前記実タイミングとの差により前記指令タイミングを補正する、
ことを特徴とする請求項１から３のいずれか一項に記載のポンプ制御装置。 Timing acquisition means (S406) for acquiring the actual timing of the metering timing based on the actual discharge amount;
The correction unit corrects the command timing based on a difference between the command timing and the actual timing acquired by the timing acquisition unit.
The pump control device according to any one of claims 1 to 3, wherein 前記調量タイミングは、前記燃料供給ポンプを駆動するカムの回転角度に同期した角度タイミングであり、
前記調量弁制御手段は、前記回転角度に対する前記吐出量の変化率が所定値以上の角度範囲内に吐出量学習用の前記指令タイミングを設定する、
ことを特徴とする請求項１から４のいずれか一項に記載のポンプ制御装置。 The metering timing is an angle timing synchronized with a rotation angle of a cam that drives the fuel supply pump,
The metering valve control means sets the command timing for learning the discharge amount within an angle range in which the rate of change of the discharge amount with respect to the rotation angle is a predetermined value or more;
The pump control device according to any one of claims 1 to 4, wherein
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017106413A (en) * 2015-12-11 2017-06-15 株式会社デンソー Pump control device
KR20180076723A (en) * 2016-12-28 2018-07-06 주식회사 현대케피코 Compensational apparatus and method using deviation of High Pressure Fuel Pump
KR20180076722A (en) * 2016-12-28 2018-07-06 주식회사 현대케피코 System for learning high pressure pump performance
KR101977512B1 (en) * 2017-12-29 2019-05-10 주식회사 현대케피코 Method and system for compensating a deviation of flow control valve response time in high pressure fuel pump of vehicle
CN112020602A (en) * 2018-04-10 2020-12-01 康明斯公司 Adaptive high pressure fuel pump system and method of predicting pumping quality

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002160613A (en) * 2000-11-24 2002-06-04 Mitsubishi Motors Corp Zero-point compensating device for brake operation relative value sensor
JP2008291808A (en) * 2007-05-28 2008-12-04 Denso Corp Common rail type fuel injection device and force feed characteristic compensating method of high pressure pump
JP2013113135A (en) * 2011-11-25 2013-06-10 Denso Corp Pump control device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002160613A (en) * 2000-11-24 2002-06-04 Mitsubishi Motors Corp Zero-point compensating device for brake operation relative value sensor
JP2008291808A (en) * 2007-05-28 2008-12-04 Denso Corp Common rail type fuel injection device and force feed characteristic compensating method of high pressure pump
JP2013113135A (en) * 2011-11-25 2013-06-10 Denso Corp Pump control device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017106413A (en) * 2015-12-11 2017-06-15 株式会社デンソー Pump control device
KR20180076723A (en) * 2016-12-28 2018-07-06 주식회사 현대케피코 Compensational apparatus and method using deviation of High Pressure Fuel Pump
KR20180076722A (en) * 2016-12-28 2018-07-06 주식회사 현대케피코 System for learning high pressure pump performance
KR101892742B1 (en) 2016-12-28 2018-08-29 주식회사 현대케피코 System for learning high pressure pump performance
KR101887181B1 (en) 2016-12-28 2018-09-10 주식회사 현대케피코 Compensational apparatus and method using deviation of High Pressure Fuel Pump
KR101977512B1 (en) * 2017-12-29 2019-05-10 주식회사 현대케피코 Method and system for compensating a deviation of flow control valve response time in high pressure fuel pump of vehicle
CN112020602A (en) * 2018-04-10 2020-12-01 康明斯公司 Adaptive high pressure fuel pump system and method of predicting pumping quality
US11486326B2 (en) 2018-04-10 2022-11-01 Cummins Inc. Adaptive high pressure fuel pump system and method for predicting pumped mass

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