JP2012189066A - Engine control device - Google Patents

Engine control device Download PDF

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JP2012189066A
JP2012189066A JP2011055754A JP2011055754A JP2012189066A JP 2012189066 A JP2012189066 A JP 2012189066A JP 2011055754 A JP2011055754 A JP 2011055754A JP 2011055754 A JP2011055754 A JP 2011055754A JP 2012189066 A JP2012189066 A JP 2012189066A
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pressure
fuel
engine
idle
supply means
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JP5589910B2 (en
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Hidehiro Urushibara
英裕 漆原
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Denso Corp
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Denso Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an engine control device that can learn relationship of a control amount and a real fuel amount without reducing fuel consumption reducing effect due to an idle stop function.SOLUTION: The control device controls the control amount to a high pressure fuel supply means in feedback on the basis of fuel pressure and target pressure of a common rail 2, learns deterioration of the high pressure fuel supply means in idle drive, and performs automatic stop and automatic start of an engine 1. Then, in fuel injection stop due to the automatic stop of the engine, this control device determines whether it shifts to the idle drive or not on the basis of an environmental condition of the engine (S120), in the sifted idle drive, a set time passes while a difference between the fuel pressure and the target pressure is small, when increase of an integral item of the control amount is large (S170: YES), this control device executes learning of the deterioration of the high pressure fuel supply means (S190), and when the increase of the integral item is small, this control device executes idle stop (S180, S210).

Description

本発明は、エンジンの自動停止及び自動始動を行うアイドルストップ機能を有するエンジン制御装置に関する。   The present invention relates to an engine control device having an idle stop function for automatically stopping and automatically starting an engine.

従来より、特許文献１にあるように、エンジンの自動停止及び自動始動を行うアイドルストップ機能を有するエンジン制御装置が知られている。また、高圧に蓄圧された燃料を保持するコモンレールから燃料噴射弁に燃料を供給する蓄圧式燃料噴射装置を備えたディーゼルエンジンのエンジン制御装置では、高圧燃料供給手段からコモンレールに高圧燃料を供給すると共に、高圧燃料供給手段からの燃料量を変更して、コモンレールの燃料圧を制御している。   Conventionally, as disclosed in Patent Document 1, an engine control device having an idle stop function for automatically stopping and automatically starting an engine is known. Further, in an engine control device for a diesel engine equipped with a pressure accumulation type fuel injection device that supplies fuel to a fuel injection valve from a common rail that holds fuel accumulated at high pressure, the high pressure fuel is supplied from the high pressure fuel supply means to the common rail. The fuel pressure of the common rail is controlled by changing the amount of fuel from the high pressure fuel supply means.

その際、センサによりコモンレールの燃料圧を検出し、検出した燃料圧と目標圧とに基づいて、燃料圧と目標圧との差が小さくなるように、高圧燃料供給手段をフィードバック制御している。また、高圧燃料供給手段の応答性の劣化等を補正するために、フィードバック制御による制御量と高圧燃料供給手段からの実燃料量との関係を学習するようにしている。   At this time, the fuel pressure of the common rail is detected by a sensor, and the high-pressure fuel supply means is feedback-controlled so that the difference between the fuel pressure and the target pressure becomes small based on the detected fuel pressure and the target pressure. Further, in order to correct the deterioration of the responsiveness of the high pressure fuel supply means, the relationship between the control amount by the feedback control and the actual fuel amount from the high pressure fuel supply means is learned.

特開２０１０−１８５３１０号公報JP 2010-185310 A

こうした従来のものでは、制御量と実燃料量との関係学習を、エンジンの運転状態が負荷により変化しないアイドル運転時に実施する必要がある。アイドルストップ機能により自動停止するとアイドル運転になることなく停止するので関係学習できない場合があり、自動停止する前にアイドル運転を行うようにして、関係学習を実施する必要がある。しかし、自動停止する前にアイドル運転を行うようにすると、アイドルストップ機能による燃費低減効果が軽減されてしまうという問題があった。   In such a conventional device, it is necessary to perform the relationship learning between the control amount and the actual fuel amount during idle operation in which the engine operating state does not change due to the load. When the automatic stop is performed by the idle stop function, the relational learning may not be performed because the automatic stop is performed without the idle operation, and it is necessary to perform the relational learning by performing the idle operation before the automatic stop. However, if the idle operation is performed before the automatic stop, there is a problem that the fuel consumption reduction effect by the idle stop function is reduced.

本発明の課題は、制御量と実燃料量との関係を学習できると共に、アイドルストップ機能による燃費低減効果を軽減しないようにしたエンジン制御装置を提供することにある。   An object of the present invention is to provide an engine control device that can learn the relationship between the control amount and the actual fuel amount and that does not reduce the fuel consumption reduction effect by the idle stop function.

かかる課題を達成すべく、本発明は課題を解決するため次の手段を取った。即ち、高圧に蓄圧された燃料を保持し燃料噴射弁に供給するコモンレールと前記コモンレールに高圧燃料を供給する高圧燃料供給手段とを備え、前記コモンレールの燃料圧と目標圧とに基づいて前記高圧燃料供給手段への制御量をフィードバック制御すると共に、アイドル運転のときに前記高圧燃料供給手段の劣化を学習し、エンジンの自動停止及び自動始動を行うエンジン制御装置において、アイドル運転のときに、前記制御量のうちの積分項の増加が大きいときには前記高圧燃料供給手段の劣化の学習を実行させ、前記積分項の増加が小さいときにはアイドルストップを実行させる学習条件判断手段を備えたことを特徴とするエンジン制御装置がそれである。   In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is, a common rail that holds fuel accumulated at high pressure and supplies the fuel injection valve with high-pressure fuel supply means that supplies high-pressure fuel to the common rail, the high-pressure fuel based on the fuel pressure and the target pressure of the common rail In an engine control apparatus that performs feedback control of a control amount to the supply means, learns deterioration of the high-pressure fuel supply means during idle operation, and automatically stops and starts the engine, the control is performed during idle operation. An engine comprising learning condition determining means for executing learning of deterioration of the high-pressure fuel supply means when the increase in the integral term of the quantity is large, and executing idle stop when the increase in the integral term is small. That is the control unit.

前記学習条件判断手段は、前記燃料圧と前記目標圧との差が小さい状態で設定時間経過し、かつ、前記制御量のうちの積分項の増加が大きいときには前記高圧燃料供給手段の劣化の学習を実行させ、前記積分項の増加が小さいときにはアイドルストップを実行させる構成でもよい。更に、前記エンジンの前記自動停止による燃料噴射停止時に、前記エンジンの環境条件に基づいてアイドル運転に移行するか否かを判断するアイドル移行判断手段を備え、前記学習条件判断手段は、前記アイドル移行判断手段により移行したアイドル運転のときに、前記制御量のうちの積分項の増加が大きいときには前記高圧燃料供給手段の劣化の学習を実行させ、前記積分項の増加が小さいときにはアイドルストップを実行させる構成としてもよい。   The learning condition determining means learns deterioration of the high-pressure fuel supply means when a set time elapses while the difference between the fuel pressure and the target pressure is small and the integral term of the control amount is large. The idle stop may be executed when the increase in the integral term is small. The engine further comprises an idle shift determining means for determining whether or not to shift to an idle operation based on an environmental condition of the engine when fuel injection is stopped by the automatic stop of the engine, and the learning condition determining means includes the idle shift During idle operation shifted by the judging means, learning of deterioration of the high-pressure fuel supply means is executed when the integral term of the control amount is large, and idle stop is executed when the integral term is small. It is good also as a structure.

本発明のエンジン制御装置は、アイドル運転のときに、フィードバック制御の制御量のうちの積分項の増加が大きいときには高圧燃料供給手段の劣化の学習を実行させ、積分項の増加が小さいときにはアイドルストップを実行させるので、制御量と実燃料量との関係を学習できると共に、アイドルストップによる燃費低減効果を軽減することがないという効果を奏する。   The engine control apparatus according to the present invention causes the learning of deterioration of the high-pressure fuel supply means to be executed when the integral term of the control amount of the feedback control is large during idle operation, and idle stop when the integral term is small. Therefore, the relationship between the control amount and the actual fuel amount can be learned, and the fuel consumption reduction effect due to the idle stop is not reduced.

学習条件判断手段が、燃料圧と目標圧との差が小さい状態で設定時間経過し、かつ、制御量のうちの積分項の増加が大きいときには高圧燃料供給手段の劣化の学習を実行させ、積分項の増加が小さいときにはアイドルストップを実行させることにより、安定した運転状態で積分項の増加を判断でき、学習をするか、あるいは、アイドルストップを実行するかを適切に判断できる。更に、アイドル移行判断手段を備え、アイドル移行判断手段によりアイドル運転に移行するか否かを判断することにより、学習に適さない環境条件ではアイドルストップによる自動停止を行って、燃費を軽減できる。   When the learning condition determining means has a small difference between the fuel pressure and the target pressure and the set time elapses and the increase in the integral term of the control amount is large, the learning of the high pressure fuel supply means is learned to perform integration. By executing idle stop when the increase in terms is small, it is possible to determine an increase in integral term in a stable operating state, and it is possible to appropriately determine whether to learn or perform idle stop. Further, by providing an idle shift determining means, and determining whether or not to shift to idle operation by the idle shift determining means, automatic stop by idle stop is performed under environmental conditions unsuitable for learning, and fuel consumption can be reduced.

本発明の一実施形態としてのエンジン制御装置を示す全体構成図である。1 is an overall configuration diagram showing an engine control device as one embodiment of the present invention. 本実施形態の電子制御ユニットにおいて行われる学習制御処理の一例を示すフローチャートである。It is a flowchart which shows an example of the learning control process performed in the electronic control unit of this embodiment. 本実施形態のアイドル移行条件、アイドル条件、学習条件の各成立を示すタイムチャートである。It is a time chart which shows each establishment of idle transition conditions, idle conditions, and learning conditions of this embodiment.

以下本発明を実施するための形態を図面に基づいて詳細に説明する。図１は本発明の一実施形態としてのエンジン制御装置を示す全体構成図である。
図１に示すように、本実施形態のエンジン制御装置は、例えば、４気筒のディーゼルエンジン１に適用されており、エンジン１は高圧燃料を蓄えるコモンレール２と、燃料タンク３からフィードポンプ１０により汲み上げた燃料を加圧してコモンレール２に供給する高圧燃料供給ポンプ４と、高圧配管１７を介してコモンレール２より供給される高圧燃料をエンジン１の気筒内の燃焼室２１に噴射する燃料噴射弁５と、燃料噴射弁５等を電子制御する電子制御ユニット６（以下ＥＣＵ６と呼ぶ）とを備えている。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail based on the drawings. FIG. 1 is an overall configuration diagram showing an engine control apparatus as an embodiment of the present invention.
As shown in FIG. 1, the engine control apparatus of the present embodiment is applied to, for example, a four-cylinder diesel engine 1, and the engine 1 is pumped up by a feed pump 10 from a common rail 2 that stores high-pressure fuel and a fuel tank 3. A high pressure fuel supply pump 4 that pressurizes the pressurized fuel and supplies it to the common rail 2; a fuel injection valve 5 that injects high pressure fuel supplied from the common rail 2 through the high pressure pipe 17 into the combustion chamber 21 in the cylinder of the engine 1; And an electronic control unit 6 (hereinafter referred to as ECU 6) for electronically controlling the fuel injection valve 5 and the like.

コモンレール２は、ＥＣＵ６により運転状態等に基づいて目標圧が設定され、高圧燃料供給ポンプ４から供給された高圧燃料を目標圧に蓄圧する。このコモンレール２には、蓄圧された燃料圧を検出してＥＣＵ６に出力する燃料圧センサ７が取り付けられている。   The common rail 2 has a target pressure set by the ECU 6 based on the operating state and the like, and accumulates the high-pressure fuel supplied from the high-pressure fuel supply pump 4 to the target pressure. A fuel pressure sensor 7 that detects the accumulated fuel pressure and outputs it to the ECU 6 is attached to the common rail 2.

高圧燃料供給ポンプ４は、エンジン１に駆動されて図示しないピストンを往復動させ、フィードポンプ１０より送り出された燃料を吸入し、加圧された燃料を吐出弁１２を押し開いてコモンレール２に供給するように構成されている。   The high-pressure fuel supply pump 4 is driven by the engine 1 to reciprocate a piston (not shown), sucks the fuel sent from the feed pump 10, pushes the pressurized fuel to open the discharge valve 12, and supplies the fuel to the common rail 2. Is configured to do.

高圧燃料供給ポンプ４には、圧力制御弁１４が設けられており、圧力制御弁１４は図示しないソレノイドを励磁することにより閉弁すると共に、燃料圧を閉弁方向に受けて閉弁状態を維持し、吸入時の負圧による作用力等により開弁する。   The high-pressure fuel supply pump 4 is provided with a pressure control valve 14 that closes by exciting a solenoid (not shown) and receives the fuel pressure in the valve closing direction to maintain the valve closed state. Then, the valve is opened by the acting force caused by the negative pressure during inhalation.

本実施形態では、燃料を吸入した後、図示しないピストンが圧縮行程に移行しても直ちに圧力制御弁１４を閉弁せずに、開弁を保持して余剰の燃料を排出し、送油量に応じた通電時期にソレノイドを励磁して閉弁し、供給時に送油量の調量を行なうプレストローク制御を行って、コモンレール２の燃料圧を制御している。尚、本実施形態では、高圧燃料供給ポンプ４と圧力制御弁１４とにより高圧燃料供給手段を構成している。   In this embodiment, after inhaling fuel, even if a piston (not shown) shifts to the compression stroke, the pressure control valve 14 is not closed immediately, but the valve is held open to discharge excess fuel, and the amount of oil delivered The solenoid is energized and closed at an energization time according to the above, and the pre-stroke control is performed to adjust the oil feed amount during supply, thereby controlling the fuel pressure of the common rail 2. In the present embodiment, the high pressure fuel supply pump 4 and the pressure control valve 14 constitute high pressure fuel supply means.

各センサ等はＥＣＵ６に接続されており、ＥＣＵ６は、周知のＣＰＵ６２、ＲＯＭ６４、ＲＡＭ６６等を中心に論理演算回路として構成され、外部と入出力を行う入出力回路、ここでは入出力回路６８をコモンバス７０を介して相互に接続されている。   Each sensor or the like is connected to the ECU 6, and the ECU 6 is configured as a logical operation circuit centering on a well-known CPU 62, ROM 64, RAM 66, etc. 70 to each other.

ＣＰＵ６２は、燃料圧センサ７、パルサ１６に形成された複数の歯を検出する電磁ピックアップを用いた回転センサ１８、アクセルペダル１９の踏込量に応じたアクセル開度を検出するアクセル開度センサ２０、冷却水温度を検出する水温センサ２２、燃料の温度を検出する燃料温度センサ２４からの入力信号を入出力回路６８を介して入力する。   The CPU 62 includes a fuel pressure sensor 7, a rotation sensor 18 using an electromagnetic pickup that detects a plurality of teeth formed on the pulsar 16, an accelerator opening sensor 20 that detects an accelerator opening corresponding to the depression amount of the accelerator pedal 19, Input signals from the water temperature sensor 22 for detecting the coolant temperature and the fuel temperature sensor 24 for detecting the temperature of the fuel are input via the input / output circuit 68.

これらの信号及びＲＯＭ６４、ＲＡＭ６６内のデータや予め記憶された制御プログラムに基づいてＣＰＵ６２は、回転センサ１８により検出される回転数やアクセル開度センサ２０により検出されるアクセル開度等の運転状態に基づいて燃料噴射弁５からの噴射量や噴射時期を算出する。また、回転数や噴射量に基づいて、コモンレール２の目標圧を算出し、噴射量とコモンレール２の目標圧とに基づいて、高圧燃料供給ポンプ４からコモンレール２に供給する送油量を算出する。   Based on these signals, data in the ROM 64 and RAM 66 and a control program stored in advance, the CPU 62 is in an operating state such as the number of revolutions detected by the rotation sensor 18 and the accelerator opening detected by the accelerator opening sensor 20. Based on this, the injection amount and injection timing from the fuel injection valve 5 are calculated. Further, the target pressure of the common rail 2 is calculated based on the rotation speed and the injection amount, and the amount of oil supplied from the high-pressure fuel supply pump 4 to the common rail 2 is calculated based on the injection amount and the target pressure of the common rail 2. .

送油量の算出の際には、フィードバック制御が行われ、燃料圧センサ７により検出されるコモンレール２の燃料圧と、目標圧との圧力偏差△Ｐを算出する。比例ゲインＫp に圧力偏差△Ｐを乗算してフィードバック制御の補正量に用いられる比例項を算出する。次に、積分ゲインＫi に燃料圧と目標圧との圧力偏差△Ｐの積分値を乗算して、積分項を算出する。続いて、指令送油量に比例項と積分項とを加算して圧力制御弁１４に出力し、圧力制御弁１４をフィードバック制御する。   When calculating the amount of oil to be fed, feedback control is performed to calculate a pressure deviation ΔP between the fuel pressure of the common rail 2 detected by the fuel pressure sensor 7 and the target pressure. A proportional term used for the correction amount of the feedback control is calculated by multiplying the proportional gain Kp by the pressure deviation ΔP. Next, the integral term is calculated by multiplying the integral gain Ki by the integral value of the pressure deviation ΔP between the fuel pressure and the target pressure. Subsequently, a proportional term and an integral term are added to the command oil feed amount and output to the pressure control valve 14 to feedback control the pressure control valve 14.

下記（１）式のように、補正量に微分ゲインＫd に圧力偏差△Ｐの微分値を乗算した微分項を加味したＰＩＤ制御によるフィードバック制御を行ってもよい。
補正量＝Ｋp ×△Ｐ＋Ｋi ×∫△Ｐ＋Ｋd ×d/dt△Ｐ…（１）
経時変化等により、高圧燃料供給手段の応答性、特に、圧力制御弁１４の応答性が劣化すると、通電時期にソレノイドを励磁しても閉弁するまでの応答性が劣化して送油量が低下し、それに伴って補正量のうち、積分項が劣化に応じて増加する。 As shown in the following equation (1), feedback control by PID control in which a differential term obtained by multiplying the correction amount by the differential gain Kd and the differential value of the pressure deviation ΔP may be performed.
Correction amount = Kp × ΔP + Ki × ∫ΔP + Kd × d / dtΔP (1)
If the responsiveness of the high-pressure fuel supply means, particularly the responsiveness of the pressure control valve 14, deteriorates due to changes over time, the responsiveness until the valve closes even if the solenoid is energized at the time of energization deteriorates, and the amount of oil sent increases. Along with this, the integral term of the correction amount increases with deterioration.

また、コモンレール２への送油量Ｑとそれによるコモンレール２内の圧力変化量△Ｐとの関係は下記（２）式により算出できる。ここで、ＶCRはコモンレール２の容積、Ｋはコモンレール２内の燃料の体積弾性係数である。   Further, the relationship between the oil feed amount Q to the common rail 2 and the pressure change amount ΔP in the common rail 2 can be calculated by the following equation (2). Here, VCR is the volume of the common rail 2, and K is the bulk elastic modulus of the fuel in the common rail 2.

Ｑ＝△Ｐ×ＶCR／Ｋ…（２）
予め送油量Ｑと圧力制御弁１４への通電時期との関係が記憶されており、この関係に基づいて、送油量Ｑから圧力制御弁１４への通電時期が算出される。 Q = ΔP × VCR / K (2)
The relationship between the oil supply amount Q and the energization timing to the pressure control valve 14 is stored in advance, and the energization timing to the pressure control valve 14 is calculated from the oil supply amount Q based on this relationship.

更に、アイドルストップ機能（ＩＳＳ）を備えており、アイドルストップ機能は運転時に自動停止条件が成立するとエンジン１の運転を自動的に停止させ、エンジン１が自動停止された後に自動始動条件が成立するとエンジン１を自動的に始動させる。例えば、エンジン１の冷却水温度が所定の範囲にあり、アクセルペダル１９が踏まれていない状態にあり、バッテリの電圧が基準電圧以上であり、図示しないブレーキペダルが踏み込まれている状態であり、車両速度が所定速度以下である全ての条件がみたされたときに自動停止条件が成立している判断し、いずれか一つでも満たされないときには自動始動条件が成立すると判断する。   Further, an idle stop function (ISS) is provided. The idle stop function automatically stops the operation of the engine 1 when an automatic stop condition is satisfied during operation, and the automatic start condition is satisfied after the engine 1 is automatically stopped. The engine 1 is automatically started. For example, the coolant temperature of the engine 1 is in a predetermined range, the accelerator pedal 19 is not depressed, the battery voltage is equal to or higher than a reference voltage, and a brake pedal (not shown) is depressed. It is determined that the automatic stop condition is satisfied when all the conditions that the vehicle speed is equal to or lower than the predetermined speed are satisfied, and it is determined that the automatic start condition is satisfied when any one is not satisfied.

次に、ＥＣＵ６により実行される学習制御処理について図２に示すフローチャートに基づいて説明する。
まず、車両の走行中に、アイドルストップ機能の要求があったか否かを判断する（ステップ１００。以下Ｓ１００という。以下同様。）。例えば、車両の走行中に、アクセルペダル１９が踏まれていない状態であることがアクセル開度センサ２０により検出され、車両が減速状態になって（無負荷減速の状態）、アイドルストップ機能の要求があると判断すると（Ｓ１００：ＹＥＳ）、アイドルストップ機能モードをスタートする（Ｓ１１０）。尚、アイドルストップ機能の要求がないときには（Ｓ１００：ＮＯ）、待機する。 Next, the learning control process executed by the ECU 6 will be described based on the flowchart shown in FIG.
First, it is determined whether or not there has been a request for an idle stop function while the vehicle is traveling (step 100; hereinafter referred to as S100; the same applies hereinafter). For example, it is detected by the accelerator opening sensor 20 that the accelerator pedal 19 is not depressed while the vehicle is running, and the vehicle is decelerated (no-load deceleration state). If it is determined that there is any (S100: YES), the idle stop function mode is started (S110). If there is no request for the idle stop function (S100: NO), the system waits.

アイドルストップ機能モードでは、燃料噴射弁５からの燃料噴射を停止する。そして、次に、この燃料噴射停止時に、アイドル移行条件が成立したか否かを環境条件やシステム条件に基づいて判断する（Ｓ１２０）。   In the idle stop function mode, the fuel injection from the fuel injection valve 5 is stopped. Next, when this fuel injection is stopped, it is determined whether or not the idle transition condition is satisfied based on the environmental condition and the system condition (S120).

環境条件やシステム条件としての各条件を満たしているとき、例えば、本実施形態では、水温センサ２２により検出される冷却水温度が予め設定された温度以上で、図示しないバッテリの電圧が予め設定された値以上で、燃料温度センサ２４により検出される燃料温度が予め設定された温度以上で、図示しないスタータモータが駆動されていない状態で、かつ、故障診断システムにより学習禁止が設定されていない状態の全てが満たされたときに、アイドル移行条件が成立したと判断する。   When the environmental conditions and system conditions are satisfied, for example, in this embodiment, the cooling water temperature detected by the water temperature sensor 22 is equal to or higher than a preset temperature, and a battery voltage (not shown) is preset. The fuel temperature detected by the fuel temperature sensor 24 is equal to or higher than a preset temperature, the starter motor (not shown) is not driven, and learning prohibition is not set by the failure diagnosis system When all of the above are satisfied, it is determined that the idle transition condition is satisfied.

アイドル移行条件が成立していないと判断すると（Ｓ１２０：ＮＯ）、アイドルストップ機能モードを継続し（Ｓ１３０）、エンジン１を自動的に停止させる（Ｓ２１０）。
また、アイドル移行条件が成立したと判断すると（Ｓ１２０：ＹＥＳ）、環境条件やシステム条件が後述するＳ１９０のポンプ学習の実施に適した状態にあると判断して、アイドル移行モードを実行する（Ｓ１５０）。アイドル移行モードでは、エンジン１をアイドル運転するために、アイドル運転時の噴射量の燃料を燃料噴射弁５から噴射する。 If it is determined that the idle transition condition is not satisfied (S120: NO), the idle stop function mode is continued (S130), and the engine 1 is automatically stopped (S210).
If it is determined that the idle transition condition is satisfied (S120: YES), it is determined that the environmental condition and the system condition are in a state suitable for performing pump learning in S190, which will be described later, and the idle transition mode is executed (S150). ). In the idle transition mode, the fuel injection valve 5 injects the fuel of the injection amount during the idle operation in order to perform the idle operation of the engine 1.

続いて、アイドル条件が成立しているか否かを運転条件に基づいて判断する（Ｓ１６０）。運転条件としての各条件を満たしているとき、例えば、本実施形態では、アクセル開度センサ２０により検出されるアクセルペダル１９が踏まれていない状態で、回転センサ１８により検出されるエンジン１の回転数ＮＥがアイドル回転数で、燃料圧センサ７により検出されるコモンレール２の燃料圧が予め設定された燃料圧以上で、燃料噴射量がアイドル運転時の噴射量で、車両がほぼ停止状態である状態の全てを満たしているときに、アイドル条件が成立していると判断する。   Subsequently, it is determined whether or not the idle condition is satisfied based on the driving condition (S160). When each condition as the driving condition is satisfied, for example, in the present embodiment, the rotation of the engine 1 detected by the rotation sensor 18 in a state where the accelerator pedal 19 detected by the accelerator opening sensor 20 is not depressed. The number NE is the idling speed, the fuel pressure of the common rail 2 detected by the fuel pressure sensor 7 is equal to or higher than a preset fuel pressure, the fuel injection amount is the injection amount during idle operation, and the vehicle is almost stopped. When all the states are satisfied, it is determined that the idle condition is satisfied.

アイドル条件が成立していないときには（Ｓ１６０：ＮＯ）、成立するまで待機し、アイドル条件が成立したと判断すると（Ｓ１６０：ＹＥＳ）、アイドル運転での負荷の変動のない安定したエンジン１の運転状態であると判断して、学習条件が成立した状態で予め設定された設定時間経過し、例えば５秒経過したか否かを判断する（Ｓ１７０）。   If the idle condition is not satisfied (S160: NO), the system waits until the condition is satisfied, and if it is determined that the idle condition is satisfied (S160: YES), the engine 1 is in a stable operating state with no load fluctuation during idle operation. In step S170, it is determined whether a preset set time has elapsed with the learning condition being satisfied, for example, 5 seconds have elapsed.

燃料圧センサ７により検出されるコモンレール２の燃料圧と目標圧との差が小さく、前述したフィードバック制御での前回の制御量から積分項の変化が大きいときに、例えば、積分項の変化が予め設定された閾値よりも大きいときに、学習条件が成立したと判断する。高圧燃料供給手段の応答性が経時変化等により劣化すると、フィードバック制御での積分項が大きくなる。フィードバック制御の際、前回の制御量の積分項と、今回の制御量の積分項とを比較して、その差が大きいときに学習条件が成立したと判断する。   When the difference between the fuel pressure of the common rail 2 detected by the fuel pressure sensor 7 and the target pressure is small and the change in the integral term from the previous control amount in the feedback control is large, for example, the change in the integral term is When it is larger than the set threshold value, it is determined that the learning condition is satisfied. If the responsiveness of the high-pressure fuel supply means deteriorates due to changes over time, the integral term in the feedback control becomes large. During feedback control, the previous control amount integral term is compared with the current control amount integral term, and it is determined that the learning condition is satisfied when the difference is large.

学習条件が成立していないときには（Ｓ１７０：ＮＯ）、学習を実行することなく、アイドルストップ機能モードに移行し（Ｓ１８０）、燃料噴射を停止してエンジン１を自動的に停止させる（Ｓ２１０）。   When the learning condition is not satisfied (S170: NO), the learning mode is not executed and the mode is shifted to the idle stop function mode (S180), the fuel injection is stopped and the engine 1 is automatically stopped (S210).

学習条件が成立しているときには（Ｓ１７０：ＹＥＳ）、高圧燃料供給手段の応答性が経時変化等により劣化が大きいと判断して、ポンプ学習を実施する（Ｓ１９０）。ポンプ学習では、高圧燃料供給手段の応答性の劣化を学習し、劣化量に応じて圧力制御弁１４の図示しないソレノイドの通電時期を早める。アイドル運転時には負荷の変動等がなく、ほぼ一定の運転状態であり、コモンレール２の目標圧や送油量がほぼ一定の状態となる。   When the learning condition is satisfied (S170: YES), it is determined that the responsiveness of the high pressure fuel supply means is greatly deteriorated due to a change with time or the like, and the pump learning is performed (S190). In the pump learning, the deterioration of the responsiveness of the high-pressure fuel supply means is learned, and the energization timing of a solenoid (not shown) of the pressure control valve 14 is advanced according to the deterioration amount. During idle operation, there is no fluctuation in load and the like, and the operation state is almost constant, and the target pressure and oil supply amount of the common rail 2 are almost constant.

アイドル運転時に高圧燃料供給ポンプ４からコモンレール２に高圧燃料が供給され、供給された実燃料量に応じてコモンレール２の燃料圧が上昇する。この燃料圧を燃料圧センサ７により検出する。応答性が劣化していなければ、制御量に応じた高圧燃料が供給されてコモンレール２の圧力が目標圧になる。応答性が劣化して、制御量に応じた高圧燃料が供給されないと、燃料圧センサ７により検出される燃料圧も低くなる。応答性が劣化しているときには劣化量に応じて圧力制御弁１４の図示しないソレノイドの通電時期を早め、制御量と実燃料量との関係を学習する。   During idle operation, high-pressure fuel is supplied from the high-pressure fuel supply pump 4 to the common rail 2, and the fuel pressure in the common rail 2 rises according to the amount of actual fuel supplied. This fuel pressure is detected by a fuel pressure sensor 7. If the responsiveness has not deteriorated, the high-pressure fuel corresponding to the control amount is supplied, and the pressure of the common rail 2 becomes the target pressure. If the responsiveness deteriorates and high-pressure fuel corresponding to the control amount is not supplied, the fuel pressure detected by the fuel pressure sensor 7 also decreases. When the responsiveness is deteriorated, the energization timing of a solenoid (not shown) of the pressure control valve 14 is advanced according to the deterioration amount, and the relationship between the control amount and the actual fuel amount is learned.

次に、ポンプ学習が完了したか否かを判断し（Ｓ２００）、完了していないときには（Ｓ２００：ＮＯ）、Ｓ１９０以下の処理を繰り返し、完了したときには（Ｓ２００：ＹＥＳ）、燃料噴射を停止してエンジン１を自動的に停止させる（Ｓ２１０）。そして、本制御処理を一旦終了する。尚、本実施形態では、Ｓ１００〜Ｓ１５０の処理の実行がアイドル移行判断手段として働き、Ｓ１６０〜Ｓ２００の処理の実行が学習条件判断手段として働く。   Next, it is determined whether or not the pump learning is completed (S200). When the learning is not completed (S200: NO), the processing from S190 is repeated, and when completed (S200: YES), the fuel injection is stopped. The engine 1 is automatically stopped (S210). And this control process is once complete | finished. In the present embodiment, the execution of the processes of S100 to S150 serves as idle shift determination means, and the execution of the processes of S160 to S200 serves as learning condition determination means.

前出した学習制御処理の実行により、図３に示すタイムチャートのように、無負荷減速の状態となり、アイドルストップ機能の要求があると（Ｓ１００：ＹＥＳ）、アイドルストップ機能モードをスタートして（Ｓ１１０）、燃料噴射を停止する。これにより、早期に燃料噴射を停止して、燃費を改善できる。   When the learning control process described above is executed, as shown in the time chart of FIG. 3, when there is a no-load deceleration state and there is a request for the idle stop function (S100: YES), the idle stop function mode is started ( S110), fuel injection is stopped. Thereby, fuel injection can be stopped early and fuel consumption can be improved.

そして、アイドル移行条件が成立すると（Ｓ１２０：ＹＥＳ）、アイドル運転に移行して（Ｓ１５０）、アイドル運転時の噴射量の燃料を燃料噴射弁５から噴射する。尚、アイドル移行条件が成立しないときには（Ｓ１２０：ＮＯ）、アイドルストップ機能の実行を維持し、エンジン１の回転数ＮＥが低下してエンジン１が自動的に停止する（Ｓ２１０）。   When the idle transition condition is satisfied (S120: YES), the operation shifts to the idle operation (S150), and the fuel injection amount 5 is injected from the fuel injection valve 5 during the idle operation. When the idle transition condition is not satisfied (S120: NO), the execution of the idle stop function is maintained, the engine speed NE of the engine 1 is reduced, and the engine 1 is automatically stopped (S210).

アイドル運転に移行すると、エンジン１の回転数ＮＥがアイドル回転数にまで徐々に低下し、アイドル回転数になると、アイドル回転数を維持する。そして、アイドル条件が成立し（Ｓ１６０：ＹＥＳ）、予め設定された時間、例えば、５秒が経過し、学習条件が成立すると（Ｓ１７０：ＹＥＳ）、引き続き、アイドル運転状態を維持し、その間にポンプ学習を実行する（Ｓ１９０）。ポンプ学習の実行を完了するまでには、１０秒程度の時間を必要とする。   When shifting to the idling operation, the engine speed NE of the engine 1 gradually decreases to the idling engine speed, and when it reaches the idling engine speed, the idling engine speed is maintained. Then, when the idle condition is satisfied (S160: YES) and a preset time, for example, 5 seconds elapses and the learning condition is satisfied (S170: YES), the idle operation state is continuously maintained and the pump is in the meantime. Learning is executed (S190). It takes about 10 seconds to complete the execution of pump learning.

一方、５秒経過して学習条件が成立しないときには（Ｓ１７０：ＮＯ）、アイドルストップ機能モードに移行して、燃料噴射を停止してエンジン１を自動的に停止させる（Ｓ２１０）。   On the other hand, when the learning condition is not satisfied after 5 seconds (S170: NO), the engine shifts to the idle stop function mode, stops the fuel injection, and automatically stops the engine 1 (S210).

従って、フィードバック制御の積分項の変化が大きく、学習条件が成立したときに、ポンプ学習を実施するので、経時変化等による劣化があるときに、有効に応答性劣化の学習をすることができる。また、フィードバック制御の積分項の変化が小さいときには、経時変化等による劣化も小さいので、ポンプ学習を実施することなく、アイドルストップ機能の実行を行って、早期にエンジン１を自動的に停止させて、燃費の改善を図る。   Therefore, since the pump learning is performed when the change in the integral term of the feedback control is large and the learning condition is satisfied, the responsiveness deterioration can be effectively learned when there is a deterioration due to a change with time or the like. Further, when the change in the integral term of the feedback control is small, the deterioration due to the change with time etc. is also small. Therefore, the engine 1 is automatically stopped early by executing the idle stop function without performing the pump learning. To improve fuel economy.

以上本発明はこの様な実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲において種々なる態様で実施し得る。   The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

１…ディーゼルエンジン ２…コモンレール
３…燃料タンク ４…高圧燃料供給ポンプ
５…燃料噴射弁 ６…電子制御ユニット
７…燃料圧センサ １０…フィードポンプ
１２…吐出弁 １４…圧力制御弁
１８…回転センサ ２０…アクセル開度センサ
２２…水温センサ ２４…燃料温度センサ DESCRIPTION OF SYMBOLS 1 ... Diesel engine 2 ... Common rail 3 ... Fuel tank 4 ... High-pressure fuel supply pump 5 ... Fuel injection valve 6 ... Electronic control unit 7 ... Fuel pressure sensor 10 ... Feed pump 12 ... Discharge valve 14 ... Pressure control valve 18 ... Rotation sensor 20 ... Accelerator opening sensor 22 ... Water temperature sensor 24 ... Fuel temperature sensor

Claims (3)

高圧に蓄圧された燃料を保持し燃料噴射弁に供給するコモンレールと前記コモンレールに高圧燃料を供給する高圧燃料供給手段とを備え、
前記コモンレールの燃料圧と目標圧とに基づいて前記高圧燃料供給手段への制御量をフィードバック制御すると共に、アイドル運転のときに前記高圧燃料供給手段の劣化を学習し、エンジンの自動停止及び自動始動を行うエンジン制御装置において、
アイドル運転のときに、前記制御量のうちの積分項の増加が大きいときには前記高圧燃料供給手段の劣化の学習を実行させ、前記積分項の増加が小さいときにはアイドルストップを実行させる学習条件判断手段を備えたことを特徴とするエンジン制御装置。 A common rail that holds fuel accumulated at a high pressure and supplies the fuel to the fuel injection valve; and a high-pressure fuel supply means that supplies high-pressure fuel to the common rail,
The control amount to the high-pressure fuel supply means is feedback-controlled based on the fuel pressure and the target pressure of the common rail, and the deterioration of the high-pressure fuel supply means is learned during idle operation, and the engine is automatically stopped and automatically started. In the engine control device that performs
Learning condition determining means for performing learning of deterioration of the high-pressure fuel supply means when the integral term of the control amount is large during idle operation, and executing idle stop when the integral term is small; An engine control device comprising the engine control device. 前記学習条件判断手段は、前記燃料圧と前記目標圧との差が小さい状態で設定時間経過し、かつ、前記制御量のうちの積分項の増加が大きいときには前記高圧燃料供給手段の劣化の学習を実行させ、前記積分項の増加が小さいときにはアイドルストップを実行させることを特徴とする請求項１に記載のエンジン制御装置。 The learning condition determining means learns deterioration of the high-pressure fuel supply means when a set time elapses while the difference between the fuel pressure and the target pressure is small and the integral term of the control amount is large. The engine control apparatus according to claim 1, wherein idle stop is executed when the increase in the integral term is small. 更に、前記エンジンの前記自動停止による燃料噴射停止時に、前記エンジンの環境条件に基づいてアイドル運転に移行するか否かを判断するアイドル移行判断手段を備え、前記学習条件判断手段は、前記アイドル移行判断手段により移行したアイドル運転のときに、前記制御量のうちの積分項の増加が大きいときには前記高圧燃料供給手段の劣化の学習を実行させ、前記積分項の増加が小さいときにはアイドルストップを実行させることを特徴とする請求項１または請求項２のいずれかに記載のエンジン制御装置。 The engine further comprises an idle shift determining means for determining whether or not to shift to an idle operation based on an environmental condition of the engine when fuel injection is stopped by the automatic stop of the engine, and the learning condition determining means includes the idle shift During idle operation shifted by the judging means, learning of deterioration of the high-pressure fuel supply means is executed when the integral term of the control amount is large, and idle stop is executed when the integral term is small. The engine control device according to any one of claims 1 and 2.
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CN110296018A (en) * 2019-06-29 2019-10-01 潍柴动力股份有限公司 A kind of power-up time calculation method and device
CN110296018B (en) * 2019-06-29 2022-01-25 潍柴动力股份有限公司 Power-up time calculation method and device

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