JP3146976B2 - Fuel injection amount control device for multi-cylinder internal combustion engine - Google Patents

Fuel injection amount control device for multi-cylinder internal combustion engine

Info

Publication number
JP3146976B2
JP3146976B2 JP13664396A JP13664396A JP3146976B2 JP 3146976 B2 JP3146976 B2 JP 3146976B2 JP 13664396 A JP13664396 A JP 13664396A JP 13664396 A JP13664396 A JP 13664396A JP 3146976 B2 JP3146976 B2 JP 3146976B2
Authority
JP
Japan
Prior art keywords
fuel
fuel injection
cylinder
injection valve
discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP13664396A
Other languages
Japanese (ja)
Other versions
JPH09317583A (en
Inventor
茂樹 宮下
裕昭 仁平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP13664396A priority Critical patent/JP3146976B2/en
Publication of JPH09317583A publication Critical patent/JPH09317583A/en
Application granted granted Critical
Publication of JP3146976B2 publication Critical patent/JP3146976B2/en
Anticipated expiration legal-status Critical
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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、多気筒内燃機関の
燃料噴射量制御装置に関する。The present invention relates to a fuel injection amount control device for a multi-cylinder internal combustion engine.

【０００２】[0002]

【従来の技術】燃料噴射弁は、開弁時間によって燃料噴
射量を制御するものである。従って、噴射弁の噴口近傍
にデポジットが付着する等の経時変化によって、単位時
間当たりの燃料噴射量（以下、噴射率と称する）が変化
した場合には、所望量の燃料を噴射するために開弁時間
の補正が必要となる。この補正を実施するためには、燃
料噴射弁の現在における噴射率を把握することが必要で
ある。2. Description of the Related Art A fuel injection valve controls a fuel injection amount according to a valve opening time. Therefore, when the fuel injection amount per unit time (hereinafter, referred to as an injection rate) changes due to a temporal change such as a deposit adhering to the vicinity of the injection port of the injection valve, the fuel is opened to inject a desired amount of fuel. Correction of valve time is required. In order to perform this correction, it is necessary to know the current injection rate of the fuel injection valve.

【０００３】各気筒毎に燃料噴射弁を有する多気筒内燃
機関において、各気筒毎の燃料噴射弁は共通の蓄圧室に
接続されており、蓄圧室内の燃料圧力は、燃料ポンプに
より吐出される燃料によって所定値に維持されるように
なっている。特開昭６２−１８６０３４号公報には、こ
のような構成において、蓄圧室内の燃料圧力を監視し、
燃料噴射弁の燃料噴射前後の燃料圧力変化に基づき燃料
噴射弁の噴射率を算出することが提案されている。In a multi-cylinder internal combustion engine having a fuel injection valve for each cylinder, the fuel injection valve for each cylinder is connected to a common accumulator, and the fuel pressure in the accumulator is controlled by the fuel discharged by the fuel pump. Is maintained at a predetermined value. JP-A-62-186034 discloses that in such a configuration, the fuel pressure in the accumulator is monitored,
It has been proposed to calculate an injection rate of a fuel injection valve based on a change in fuel pressure before and after fuel injection of the fuel injection valve.

【０００４】[0004]

【発明が解決しようとする課題】前述の従来技術におい
て、燃料噴射弁の噴射率を正確に算出するためには、蓄
圧室内における燃料噴射前後の燃料圧力変化が正確に測
定されなければならず、そのためには、非常に高精度の
圧力センサが必要とされる。In the prior art described above, in order to accurately calculate the injection rate of the fuel injection valve, a change in fuel pressure before and after fuel injection in the accumulator must be accurately measured. For that purpose, a very high-precision pressure sensor is required.

【０００５】従って、本発明の目的は、このような高精
度の圧力センサを使用することなく燃料噴射弁の噴射率
を正確に把握することができる多気筒内燃機関の燃料噴
射量制御装置を提供することである。Accordingly, an object of the present invention is to provide a fuel injection amount control device for a multi-cylinder internal combustion engine which can accurately grasp the injection rate of a fuel injection valve without using such a highly accurate pressure sensor. It is to be.

【０００６】[0006]

【課題を解決するための手段】請求項１に記載の本発明
による多気筒内燃機関の燃料噴射量制御装置は、蓄圧室
と、前記蓄圧室に接続された複数の燃料噴射弁と、前記
蓄圧室へ燃料を吐出する燃料ポンプ、とを具備し、前記
燃料ポンプの前記蓄圧室への特定燃料吐出及び前記特定
燃料吐出の直前又は直後に燃料噴射が実施される前記複
数の燃料噴射弁のうちの第１燃料噴射弁の燃料噴射にお
ける前記蓄圧室内の二連続の燃料圧力変化に対して、前
記二連続の燃料圧力変化の直前直後における前記蓄圧室
内の燃料圧力を一致させるように前記燃料ポンプの前記
特定燃料吐出における吐出燃料量を制御し、前記吐出燃
料量を前記第１燃料噴射弁の燃料噴射量として前記第１
燃料噴射弁の現在の噴射率を算出することを特徴とす
る。According to a first aspect of the present invention, there is provided a fuel injection amount control apparatus for a multi-cylinder internal combustion engine according to the present invention, comprising: a pressure accumulation chamber; a plurality of fuel injection valves connected to the pressure accumulation chamber; A fuel pump that discharges fuel to the fuel chamber; and a specific fuel discharge to the accumulator chamber of the fuel pump and a fuel injection performed immediately before or immediately after the specific fuel discharge. The fuel pump is controlled so that the fuel pressure in the accumulator immediately before and after the two consecutive fuel pressure changes coincides with the two consecutive fuel pressure changes in the accumulator during the fuel injection of the first fuel injection valve. Controlling the discharged fuel amount in the specific fuel discharge, and setting the discharged fuel amount as the fuel injection amount of the first fuel injection valve;
The present invention is characterized in that a current injection rate of the fuel injection valve is calculated.

【０００７】また、請求項２に記載の本発明による多気
筒内燃機関の燃料噴射量制御装置は、請求項１に記載の
燃料噴射量制御装置において、前記第１燃料噴射弁の現
在の噴射率が算出された後に、前記燃料ポンプの前記蓄
圧室への前記特定燃料吐出と、前記第１燃料噴射弁の燃
料噴射と、前記第１燃料噴射弁の燃料噴射の直前又は直
後に燃料噴射が実施される前記複数の燃料噴射弁のうち
の第２燃料噴射弁の燃料噴射とにおける前記蓄圧室内の
三連続の燃料圧力変化に対して、前記三連続の燃料圧力
変化の直前直後における前記蓄圧室内の燃料圧力を一致
させるように前記燃料ポンプの前記特定燃料吐出におけ
る吐出燃料量を制御し、前記吐出燃料量を前記第１及び
第２燃料噴射弁の燃料噴射量の和として前記第１燃料噴
射弁の現在の噴射率に基づき前記第２燃料噴射弁の現在
の噴射率を算出することを特徴とする。According to a second aspect of the present invention, there is provided a fuel injection amount control apparatus for a multi-cylinder internal combustion engine according to the first aspect of the present invention, wherein the current injection rate of the first fuel injection valve is provided. Is calculated, the specific fuel discharge to the accumulator of the fuel pump, the fuel injection of the first fuel injection valve, and the fuel injection are performed immediately before or immediately after the fuel injection of the first fuel injection valve. The three consecutive fuel pressure changes in the accumulator chamber during the fuel injection of the second fuel injection valve among the plurality of fuel injection valves are performed, and the three consecutive fuel pressure changes in the accumulator chamber immediately before and after the three consecutive fuel pressure changes are performed. Controlling the amount of fuel discharged at the specific fuel discharge of the fuel pump so as to match the fuel pressure, and setting the discharged fuel amount as the sum of the fuel injection amounts of the first and second fuel injection valves; Current injection of And calculating a current injection rate of the second fuel injection valve based on.

【０００８】また、請求項３に記載の本発明による多気
筒内燃機関の燃料噴射量制御装置は、請求項１に記載の
燃料噴射量制御装置において、前記第１燃料噴射弁の現
在の噴射率が算出された後に、前記燃料ポンプの前記蓄
圧室への特定燃料吐出時期及び前記第１燃料噴射弁以外
の特定燃料噴射弁の燃料噴射時期の少なくとも一方を、
前記燃料ポンプの特定燃料噴射吐出の直前又は直後に前
記特定燃料噴射弁の燃料噴射が実施されるように変化さ
せ、前記燃料ポンプの特定燃料吐出及び前記特定燃料噴
射弁の燃料噴射における前記蓄圧室内の二連続の燃料圧
力変化に対して、前記二連続の燃料圧力変化の直前直後
における前記蓄圧室内の燃料圧力を一致させるように前
記燃料ポンプの前記特定燃料吐出における吐出燃料量を
制御し、前記吐出燃料量を前記特定燃料噴射弁の燃料噴
射量として前記特定燃料噴射弁の現在の噴射率を算出す
ることを特徴とする。According to a third aspect of the present invention, there is provided a fuel injection amount control apparatus for a multi-cylinder internal combustion engine according to the first aspect of the present invention, wherein the current injection rate of the first fuel injection valve is provided. After is calculated, at least one of the specific fuel discharge timing of the fuel pump to the accumulator and the fuel injection timing of the specific fuel injection valve other than the first fuel injection valve,
Immediately before or immediately after the specific fuel injection discharge of the fuel pump, the fuel injection of the specific fuel injection valve is changed so as to be performed, and the pressure accumulation chamber in the specific fuel discharge of the fuel pump and the fuel injection of the specific fuel injection valve is changed. For two consecutive fuel pressure changes, controlling the amount of fuel discharged at the specific fuel discharge of the fuel pump so as to match the fuel pressure in the accumulator immediately before and after the two consecutive fuel pressure changes, A current injection rate of the specific fuel injection valve is calculated using a discharge fuel amount as a fuel injection amount of the specific fuel injection valve.

【０００９】[0009]

【発明の実施の形態】図１は、本発明による多気筒内燃
機関の燃料噴射量制御装置の実施形態を示す概略図であ
る。同図において、１０は四気筒内燃機関本体であり、
各気筒毎に燃料噴射弁７が設けられている。各燃料噴射
弁７は、共通の蓄圧室１１に接続されている。１２は、
この蓄圧室１１へ燃料を吐出する一般的な燃料ポンプで
あり、機関本体１０によって駆動される。燃料ポンプ１
２には二つのシリンダ１２ａ，１２ｂが設けられ、それ
ぞれ、蓄圧室１１に接続された高圧管１３へ、蓄圧室方
向への燃料流れだけを許容する各逆止弁１２ｃ，１２ｄ
を介して接続されている。１４は燃料ポンプ１２と燃料
タンク１５とを接続する燃料通路であり、燃料ポンプ方
向への燃料流れを提供するフィードポンプ１４ａが配置
されている。FIG. 1 is a schematic diagram showing an embodiment of a fuel injection amount control device for a multi-cylinder internal combustion engine according to the present invention. In the figure, reference numeral 10 denotes a four-cylinder internal combustion engine main body,
A fuel injection valve 7 is provided for each cylinder. Each fuel injection valve 7 is connected to a common accumulator 11. 12 is
This is a general fuel pump that discharges fuel to the pressure accumulating chamber 11, and is driven by the engine body 10. Fuel pump 1
2 is provided with two cylinders 12a and 12b, each of which is connected to a high-pressure pipe 13 connected to the pressure accumulating chamber 11, and each of the check valves 12c and 12d allowing only the fuel flow toward the pressure accumulating chamber.
Connected through. Reference numeral 14 denotes a fuel passage connecting the fuel pump 12 and the fuel tank 15, and a feed pump 14a for providing a fuel flow toward the fuel pump is arranged.

【００１０】また、燃料通路１４のフィードポンプ１４
ａより下流側には燃料通路１４内が所定圧力以上となっ
た時に余分な燃料を戻し通路１４ｂを介して燃料タンク
１５へ戻すための圧力調節器１４ｃが配置されている。
燃料ポンプ１２の第１及び第２シリンダ１２ａ，１２ｂ
は、このような燃料通路１４に、第１及び第２電磁弁１
２ｅ，１２ｆを介して接続されている。１６は、蓄圧室
１１内の燃料圧力を検出するための圧力センサである。
２０は、燃料ポンプ１２の吐出制御と共に燃料噴射弁７
の燃料噴射制御を担当する制御装置であり、前述した圧
力センサに加えて、機関運転状態を検出するための各セ
ンサ、例えば、機関回転数を検出するための回転センサ
２１、吸入空気量を検出するためのエアフローメータ２
２、及び機関温度として機関冷却水温を検出するための
冷却水温センサ２３等が接続されている。The feed pump 14 in the fuel passage 14
Downstream from a, a pressure regulator 14c for returning excess fuel to the fuel tank 15 via the return passage 14b when the pressure in the fuel passage 14 becomes equal to or higher than a predetermined pressure is disposed.
First and second cylinders 12a, 12b of fuel pump 12
The first and second solenoid valves 1 are provided in such a fuel passage 14.
They are connected via 2e and 12f. Reference numeral 16 denotes a pressure sensor for detecting the fuel pressure in the accumulator 11.
Reference numeral 20 denotes the fuel injection valve 7 together with the discharge control of the fuel pump 12.
The control device is in charge of the fuel injection control. In addition to the above-described pressure sensor, each sensor for detecting an engine operating state, for example, a rotation sensor 21 for detecting an engine speed, and detecting an intake air amount Air flow meter 2
2, a cooling water temperature sensor 23 for detecting the engine cooling water temperature as the engine temperature, and the like.

【００１１】燃料ポンプ１２は、前述したような構成を
有し、全ての燃料噴射弁が燃料噴射を完了する１サイク
ルの間に、蓄圧室１１へ第１及び第２シリンダによって
二回の燃料吐出を実施するようになっている。第１シリ
ンダ１２ａは、前述の燃料噴射サイクルにおける前半に
吐出行程を迎え、この吐出行程において第１電磁弁１２
ｅが閉弁されている間だけ燃料を吐出するようになって
おり、それにより、第１電磁弁１２ｅの開閉制御によっ
て燃料噴射サイクルの前半において燃料吐出時期及び吐
出燃料量が自由に設定可能となっている。第２シリンダ
１２ｂは、同様に、第２電磁弁１２ｆの開閉制御によっ
て燃料噴射サイクルの後半において燃料吐出時期及び吐
出燃料量が自由に設定可能となっている。The fuel pump 12 has the above-described structure, and performs two fuel discharges by the first and second cylinders to the accumulator 11 during one cycle in which all the fuel injection valves complete the fuel injection. Is implemented. The first cylinder 12a reaches a discharge stroke in the first half of the above-described fuel injection cycle, and in this discharge stroke, the first solenoid valve 12a
e, the fuel is discharged only while the valve is closed, whereby the opening and closing control of the first solenoid valve 12e allows the fuel discharge timing and the discharged fuel amount to be freely set in the first half of the fuel injection cycle. Has become. Similarly, the second cylinder 12b can freely set the fuel discharge timing and the discharged fuel amount in the latter half of the fuel injection cycle by controlling the opening and closing of the second solenoid valve 12f.

【００１２】本実施形態の内燃機関１０において、各燃
料噴射弁７は、各気筒の吸気通路に燃料を噴射するもの
であり、吸気行程以前に燃料噴射を完了する吸気非同期
燃料噴射が実施される。図２は、通常時の燃料ポンプ１
２の吐出制御及び燃料噴射弁７の燃料噴射制御を示す第
１タイムチャートである。各燃料噴射弁７は、対応する
気筒の排気行程において燃料を噴射するようになってい
る。本実施形態の内燃機関１０において、点火は、４番
気筒、２番気筒、１番気筒、３番気筒の順番で行われる
ようになっている。In the internal combustion engine 10 of this embodiment, each fuel injection valve 7 injects fuel into the intake passage of each cylinder, and performs intake asynchronous fuel injection that completes fuel injection before the intake stroke. . FIG. 2 shows the fuel pump 1 in a normal state.
2 is a first time chart showing discharge control 2 and fuel injection control of a fuel injection valve 7; Each fuel injection valve 7 is configured to inject fuel during an exhaust stroke of a corresponding cylinder. In the internal combustion engine 10 of the present embodiment, ignition is performed in the order of the fourth cylinder, the second cylinder, the first cylinder, and the third cylinder.

【００１３】回転センサ２１、エアフローメータ２２、
及び冷却水温センサ２３等の出力に基づき定まる機関運
転状態に応じて必要燃料噴射量が決定され、この必要燃
料噴射量を噴射するための開弁時間が、各燃料噴射弁７
の新品時における単位時間当たりの所定燃料噴射量に基
づき決定され、各燃料噴射弁７の開弁及び閉弁が制御さ
れる。燃料ポンプ１２は、２番気筒の燃料噴射が完了し
た後に第１シリンダ１２ａによって、３番気筒の燃料噴
射が完了した後に第２シリンダ１２ｂによって、蓄圧室
１１へ燃料を吐出するようになっている。A rotation sensor 21, an air flow meter 22,
The required fuel injection amount is determined according to the engine operating state determined based on the outputs of the cooling water temperature sensor 23 and the like, and the valve opening time for injecting the required fuel injection amount is determined by each fuel injection valve 7.
Is determined based on a predetermined fuel injection amount per unit time at the time of new product, and the opening and closing of each fuel injection valve 7 are controlled. The fuel pump 12 discharges fuel to the pressure accumulating chamber 11 by the first cylinder 12a after the fuel injection of the second cylinder is completed and by the second cylinder 12b after the fuel injection of the third cylinder is completed. .

【００１４】それにより、蓄圧室１１内の燃料圧力は、
４番気筒の燃料噴射によって圧力降下し、２番気筒の燃
料噴射によってさらに圧力降下し、燃料ポンプ１２の第
１シリンダ１２ａの燃料吐出によって圧力上昇し、１番
気筒の燃料噴射によって圧力降下し、３番気筒の燃料噴
射によってさらに圧力降下し、燃料ポンプ１２の第２シ
リンダ１２ｂの燃料吐出によって再び圧力上昇する。燃
料ポンプ１２の第１及び第２シリンダ１２ａ，１２ｂに
よる燃料吐出によって所定燃料圧力Ｐに圧力上昇させる
ように各シリンダ１２ａ，１２ｂの吐出燃料量が制御さ
れるようになっている。Thus, the fuel pressure in the accumulator 11 becomes
The pressure drops by the fuel injection of the fourth cylinder, the pressure drops further by the fuel injection of the second cylinder, the pressure rises by the fuel discharge of the first cylinder 12a of the fuel pump 12, the pressure drops by the fuel injection of the first cylinder, The pressure drops further by the fuel injection of the third cylinder, and the pressure rises again by the fuel discharge of the second cylinder 12b of the fuel pump 12. The amount of fuel discharged from each of the cylinders 12a and 12b is controlled so that the pressure is increased to a predetermined fuel pressure P by discharging the fuel from the first and second cylinders 12a and 12b of the fuel pump 12.

【００１５】各燃料噴射弁７の新品時における単位時間
当たりの所定燃料噴射量が維持される限り、このような
制御によって各燃料噴射弁７から機関運転状態に対する
必要量の燃料を噴射することができる。しかしながら、
燃料噴射弁の噴口近傍にデポジットが付着する等の経時
変化によって、各燃料噴射弁７毎に単位時間当たりの燃
料噴射量（以下、噴射率と称する）が変化すると、必要
量の燃料が噴射できなくなる。従って、各燃料噴射弁７
における現在の噴射率を把握して、各燃料噴射弁７毎に
開弁時間を補正することが必要とされる。As long as the predetermined fuel injection amount per unit time at the time of a new product of each fuel injection valve 7 is maintained, the required amount of fuel for each engine operating state can be injected from each fuel injection valve 7 by such control. it can. However,
When the amount of fuel injection per unit time (hereinafter, referred to as injection rate) changes for each fuel injection valve 7 due to a temporal change such as deposits adhering near the injection port of the fuel injection valve, a required amount of fuel can be injected. Disappears. Therefore, each fuel injection valve 7
It is necessary to grasp the current injection rate at and to correct the valve opening time for each fuel injection valve 7.

【００１６】図３は、燃料噴射弁７の噴射率を把握する
ための燃料ポンプ１２の吐出制御を示す第２タイムチャ
ートである。各燃料噴射弁７による燃料噴射制御は、第
１タイムチャートと同様に行われる。燃料ポンプ１２の
吐出制御は、吐出時期については第１タイムチャートと
同様であるが、２番気筒の燃料噴射の完了直後に実施さ
れる第１シリンダ１２ａによる燃料吐出において、圧力
センサ１６によって蓄圧室１１内の燃料圧力が監視さ
れ、２番気筒の燃料噴射が開始される直前Ａ１の燃料圧
力と吐出完了直後Ａ２の燃料圧力とが一致するように吐
出燃料量が制御される。一方、３番気筒の燃料噴射の完
了後に実施される第２シリンダ１２ｂによる燃料吐出に
おいては、所定燃料圧力Ｐに圧力上昇させるように吐出
燃料量が制御される。FIG. 3 is a second time chart showing the discharge control of the fuel pump 12 for grasping the injection rate of the fuel injection valve 7. The fuel injection control by each fuel injection valve 7 is performed in the same manner as in the first time chart. The discharge control of the fuel pump 12 is the same as that of the first time chart with respect to the discharge timing. However, in the fuel discharge by the first cylinder 12a performed immediately after the completion of the fuel injection of the second cylinder, the pressure sensor 16 controls the pressure accumulation chamber. The fuel pressure in the cylinder 11 is monitored, and the discharged fuel amount is controlled so that the fuel pressure of A1 immediately before the start of the fuel injection of the second cylinder coincides with the fuel pressure of A2 immediately after the completion of the discharge. On the other hand, in the fuel discharge by the second cylinder 12b performed after the completion of the fuel injection of the third cylinder, the discharged fuel amount is controlled so as to increase the pressure to the predetermined fuel pressure P.

【００１７】このように、燃料ポンプ１２の第１シリン
ダ１２ａによる燃料吐出及びこの燃料吐出の直前に燃料
噴射が実施される２番気筒の燃料噴射弁の燃料噴射にお
ける蓄圧室内の二連続の燃料圧力変化（燃料噴射による
圧力降下及び燃料吐出による圧力上昇）に対して、この
二連続の圧力変化の直前直後Ａ１，Ａ２における蓄圧室
内の燃料圧力が一致させられるために、第１シリンダ１
２ａによる吐出燃料量は、２番気筒の燃料噴射弁により
噴射された燃料量に一致し、この時の開弁時間に基づき
現在における２番気筒の燃料噴射弁の噴射率を直接的に
算出することができる。As described above, the two consecutive fuel pressures in the accumulator during the fuel injection by the first cylinder 12a of the fuel pump 12 and the fuel injection by the fuel injection valve of the second cylinder in which the fuel injection is performed immediately before the fuel discharge. Since the fuel pressure in the accumulator at A1 and A2 immediately before and after the two consecutive pressure changes is matched with the change (pressure drop due to fuel injection and pressure rise due to fuel discharge), the first cylinder 1
The amount of fuel discharged by 2a corresponds to the amount of fuel injected by the fuel injection valve of the second cylinder, and the current injection rate of the fuel injection valve of the second cylinder is directly calculated based on the valve opening time at this time. be able to.

【００１８】燃料噴射弁の噴射率の算出に際して、例え
ば、圧力センサによって二つの燃料圧力差を検出するよ
うな場合には、検出された二つの燃料圧力値自身の信頼
性が低いと、一般的に、求められた燃料圧力差の信頼性
も低くなるために、高精度の圧力センサが必要とされ
る。これに対して、本実施形態では、圧力センサ１６
は、噴射率算出に際して二つの燃料圧力が一致したこと
を確認するために使用され、圧力センサ１６をこのよう
に使用する場合には、圧力センサによって検出された燃
料圧力値自身は高い信頼性を必要としないために、高精
度の圧力センサは不要である。In calculating the injection rate of a fuel injection valve, for example, when two fuel pressure differences are detected by a pressure sensor, if the reliability of the two detected fuel pressure values themselves is low, it is general. In addition, since the reliability of the obtained fuel pressure difference is low, a high-precision pressure sensor is required. On the other hand, in the present embodiment, the pressure sensor 16
Is used to confirm that the two fuel pressures match when calculating the injection rate. When the pressure sensor 16 is used in this manner, the fuel pressure value itself detected by the pressure sensor has high reliability. Since it is not needed, a high precision pressure sensor is not needed.

【００１９】このようにして、２番気筒の燃料噴射弁に
おける現在の噴射率が算出された後には、燃料ポンプ１
２の第１シリンダ１２ａによる燃料吐出において、圧力
センサ１６により蓄圧室１１内の燃料圧力が監視され、
この吐出直前Ｂ１の燃料圧力と１番気筒の燃料噴射の完
了直後Ｂ２の燃料圧力とが一致するように、吐出燃料量
が制御される。このように燃料圧力を一致させること
は、一回のサイクルでは不可能であるが、例えば、機関
定常運転時等にように１番気筒の燃料噴射弁の開弁時間
を変化させない場合におけるフィードバック制御により
可能となる。一方、３番気筒の燃料噴射の完了後に実施
される第２シリンダ１２ｂによる燃料吐出においては、
所定燃料圧力Ｐに圧力上昇させるように吐出燃料量が制
御される。After the current injection rate of the fuel injection valve of the second cylinder is calculated in this manner, the fuel pump 1
During the fuel discharge by the second first cylinder 12a, the fuel pressure in the accumulator 11 is monitored by the pressure sensor 16,
The discharged fuel amount is controlled such that the fuel pressure of B1 immediately before the discharge coincides with the fuel pressure of B2 immediately after the completion of the fuel injection of the first cylinder. It is impossible to match the fuel pressures in one cycle as described above. However, for example, feedback control in a case where the opening time of the fuel injection valve of the first cylinder is not changed, such as during steady engine operation, is performed. Becomes possible. On the other hand, in the fuel discharge by the second cylinder 12b performed after the completion of the fuel injection of the third cylinder,
The discharged fuel amount is controlled so as to increase the pressure to a predetermined fuel pressure P.

【００２０】このように、燃料ポンプ１２の第１シリン
ダ１２ａによる燃料吐出及びこの燃料吐出の直後に燃料
噴射が実施される１番気筒の燃料噴射弁の燃料噴射にお
ける蓄圧室内の二連続の燃料圧力変化（燃料吐出による
圧力上昇及び燃料噴射による圧力降下）に対して、この
二連続の圧力変化の直前直後Ｂ１，Ｂ２における蓄圧室
内の燃料圧力が一致させられるために、第１シリンダ１
２ａによる吐出燃料量は、１番気筒の燃料噴射弁により
噴射された燃料量に一致し、この時の開弁時間に基づき
現在における１番気筒の燃料噴射弁の噴射率を直接的に
算出することができる。As described above, the two consecutive fuel pressures in the accumulator during the fuel injection by the first cylinder 12a of the fuel pump 12 and the fuel injection by the fuel injection valve of the first cylinder in which the fuel injection is performed immediately after the fuel discharge. Since the fuel pressure in the accumulator at B1 and B2 immediately before and after the two consecutive pressure changes is matched with the change (pressure increase due to fuel discharge and pressure drop due to fuel injection), the first cylinder 1
The amount of fuel discharged by 2a matches the amount of fuel injected by the fuel injection valve of the first cylinder, and the current injection rate of the fuel injection valve of the first cylinder is directly calculated based on the valve opening time at this time. be able to.

【００２１】３番気筒及び４番気筒の燃料噴射弁による
燃料噴射は、燃料ポンプ１２の第２シリンダ１２ｂによ
る燃料吐出の直前及び直後に実施されるものであり、前
述した燃料ポンプ１２の第１シリンダ１２ａにおける吐
出燃料量制御を第２シリンダ１２ｂにおいて実施すれ
ば、３番気筒の燃料噴射弁における現在の噴射率及び４
番気筒の燃料噴射弁における現在の噴射率を直接的に算
出することができる。The fuel injection by the fuel injection valves of the third and fourth cylinders is performed immediately before and immediately after the fuel is discharged by the second cylinder 12b of the fuel pump 12, and the first fuel injection of the fuel pump 12 is performed. If the control of the discharged fuel amount in the cylinder 12a is performed in the second cylinder 12b, the current injection rate of the fuel injection valve of the third cylinder and 4
It is possible to directly calculate the current injection rate of the fuel injection valve of the cylinder No.

【００２２】２番気筒及び１番気筒の燃料噴射弁のおけ
る現在の噴射率が把握されていれば、図４に示す第３タ
イムチャートのような燃料ポンプ１２の燃料吐出制御に
よっても３番気筒及び４番気筒の燃料噴射弁における現
在の噴射率をそれぞれ把握することができる。この燃料
吐出量制御は、燃料ポンプ１２の第１シリンダ１２ａに
よる燃料吐出において、圧力センサ１６により蓄圧室１
１内の燃料圧力が監視され、４番気筒の燃料噴射直前Ｃ
１の燃料圧力と、第１シリンダ１２ａによる燃料吐出直
後Ｃ２の燃料圧力とが一致するように、吐出燃料量が制
御される。If the current injection rates of the fuel injection valves of the second and first cylinders are known, the third cylinder can be controlled by the fuel discharge control of the fuel pump 12 as shown in the third time chart of FIG. And the current injection rate of the fourth cylinder fuel injection valve can be grasped. This fuel discharge amount control is performed by the pressure sensor 16 during the fuel discharge by the first cylinder 12 a of the fuel pump 12.
The fuel pressure in the cylinder No. 1 is monitored, and C
The discharged fuel amount is controlled so that the fuel pressure of No. 1 matches the fuel pressure of C2 immediately after the fuel is discharged by the first cylinder 12a.

【００２３】このように、燃料ポンプ１２の第１シリン
ダ１２ａによる燃料吐出と、この燃料吐出の直前に燃料
噴射が実施される２番気筒の燃料噴射弁の燃料噴射と、
２番気筒の燃料噴射弁の燃料噴射直前に燃料噴射が実施
される４番気筒の燃料噴射弁の燃料噴射とにおける蓄圧
室内の三連続の燃料圧力変化に対して、この三連続の圧
力変化の直前直後Ｃ１，Ｃ２における蓄圧室内の燃料圧
力が一致させられるために、第１シリンダ１２ａによる
吐出燃料量は、２番気筒の燃料噴射弁及び４番気筒の燃
料噴射弁により噴射された燃料量の和に一致し、この時
の２番気筒の燃料噴射弁及び４番気筒の燃料噴射弁の開
弁時間に基づき２番気筒の燃料噴射弁における現在の噴
射率を考慮すれば、現在における４番気筒の燃料噴射弁
の噴射率を算出することが可能となる。As described above, the fuel is discharged by the first cylinder 12a of the fuel pump 12, the fuel is injected from the fuel injection valve of the second cylinder in which the fuel is injected immediately before the fuel is discharged, and
In contrast to the three consecutive fuel pressure changes in the accumulator chamber between the fuel injection of the fourth cylinder and the fuel injection of the fourth cylinder in which the fuel injection is performed immediately before the fuel injection of the second cylinder fuel injection valve, Immediately before and after the fuel pressures in the accumulator chambers at C1 and C2 are matched, the amount of fuel discharged by the first cylinder 12a is equal to the amount of fuel injected by the fuel injection valve of the second cylinder and the fuel injection valve of the fourth cylinder. If the current injection rate of the fuel injection valve of the second cylinder is considered based on the opening time of the fuel injection valve of the second cylinder and the fuel injection valve of the fourth cylinder at this time, It is possible to calculate the injection rate of the fuel injection valve of the cylinder.

【００２４】３番気筒の燃料噴射弁における現在の噴射
率は、燃料ポンプ１２の第２シリンダ１２ｂによる燃料
吐出を第１シリンダ１２ａと同様に制御することで、１
番気筒の燃料噴射弁の噴射率に基づき算出することがで
きる。また、２番気筒の燃料噴射弁の噴射率が把握され
ていれば、１番気筒の燃料噴射弁の噴射率を算出するた
めに、第３タイムチャートに示すように、燃料ポンプ１
２の第１シリンダ１２ａの燃料吐出において、圧力セン
サ１６により蓄圧室１１内の燃料圧力を監視し、２番気
筒の燃料噴射直前Ｄ１の燃料圧力と、１番気筒の燃料噴
射直後Ｄ２の燃料圧力とが一致するように、吐出燃料量
をフィードバック制御しても良い。The current injection rate of the third cylinder fuel injection valve is determined by controlling the fuel discharge by the second cylinder 12b of the fuel pump 12 in the same manner as the first cylinder 12a.
It can be calculated based on the injection rate of the fuel injection valve of the cylinder No. If the injection rate of the fuel injection valve of the second cylinder is known, the fuel pump 1 is calculated as shown in the third time chart in order to calculate the injection rate of the fuel injection valve of the first cylinder.
During the fuel discharge of the first cylinder 12a, the fuel pressure in the accumulator chamber 11 is monitored by the pressure sensor 16, and the fuel pressure D1 immediately before the fuel injection of the second cylinder and the fuel pressure D2 immediately after the fuel injection of the first cylinder The discharged fuel amount may be feedback-controlled so that?

【００２５】このように、燃料ポンプ１２の第１シリン
ダ１２ａによる燃料吐出と、この燃料吐出の直前に燃料
噴射が実施される２番気筒の燃料噴射弁の燃料噴射と、
２番気筒の燃料噴射弁の燃料噴射直後に燃料噴射が実施
される１番気筒の燃料噴射弁の燃料噴射とにおける蓄圧
室内の三連続の燃料圧力変化に対して、この三連続の圧
力変化の直前直後Ｄ１，Ｄ２における蓄圧室内の燃料圧
力が一致させられるために、第１シリンダ１２ａによる
吐出燃料量は、２番気筒の燃料噴射弁及び１番気筒の燃
料噴射弁により噴射された燃料量の和に一致し、この時
の２番気筒の燃料噴射弁及び１番気筒の燃料噴射弁の開
弁時間に基づき２番気筒の燃料噴射弁における現在の噴
射率を考慮すれば、現在における１番気筒の燃料噴射弁
の噴射率を算出することが可能となる。As described above, the fuel discharge by the first cylinder 12a of the fuel pump 12, the fuel injection by the fuel injection valve of the second cylinder in which the fuel injection is performed immediately before the fuel discharge, and
In contrast to the three consecutive changes in fuel pressure in the accumulator chamber between the fuel injection of the first cylinder and the fuel injection of the first cylinder in which fuel injection is performed immediately after the fuel injection of the second cylinder fuel injection valve, Immediately before and after the fuel pressures in the accumulator chambers at D1 and D2 are matched, the amount of fuel discharged by the first cylinder 12a is equal to the amount of fuel injected by the fuel injection valve of the second cylinder and the fuel injection valve of the first cylinder. If the current injection rate of the fuel injection valve of the second cylinder is considered based on the opening time of the fuel injection valve of the second cylinder and the fuel injection valve of the first cylinder at this time, It is possible to calculate the injection rate of the fuel injection valve of the cylinder.

【００２６】以上説明したように、燃料ポンプ１２が１
サイクルで二回以上燃料を吐出するものであれば、一回
の燃料吐出を特定燃料噴射弁の噴射率の算出のために制
御させても、残りの燃料吐出によって他の燃料噴射弁に
より噴射される燃料量を確保することができ、機関運転
中に各気筒の燃料噴射弁の噴射率を正確に算出すること
ができる。しかしながら、燃料ポンプが１サイクルで一
回しか燃料を吐出しない場合には、例えば、フューエル
カット中において、特定気筒の燃料噴射弁だけを所定時
間開弁させて燃料を噴射するようにし、この燃料噴射及
び燃料ポンプによる燃料吐出における蓄圧室内の二連続
の燃料圧力変化の直前直後のおける燃料圧力を一致させ
るように、燃料ポンプの吐出燃料量を制御すれば、この
特定気筒の燃料噴射弁の現在の噴射率を算出することが
でき、次に、特定気筒を変化させることで全ての燃料噴
射弁の現在における噴射率を把握することができる。As described above, the fuel pump 12
If the fuel is discharged two or more times in a cycle, even if one fuel discharge is controlled for calculating the injection rate of the specific fuel injection valve, the fuel is injected by another fuel injection valve by the remaining fuel discharge. Therefore, the fuel injection rate of the fuel injection valve of each cylinder can be accurately calculated during the operation of the engine. However, when the fuel pump discharges fuel only once in one cycle, for example, during fuel cut, only the fuel injection valve of a specific cylinder is opened for a predetermined time to inject fuel. And, by controlling the amount of fuel discharged from the fuel pump so that the fuel pressure immediately before and after the two consecutive changes in fuel pressure in the accumulator during fuel discharge by the fuel pump is matched, the current fuel injection valve of this specific cylinder is The injection rates can be calculated, and then the current injection rates of all the fuel injection valves can be grasped by changing the specific cylinder.

【００２７】次に、六気筒内燃機関の場合について説明
する。この場合には、各気筒毎に設けられた六つの燃料
噴射弁が共通の蓄圧室１１に接続される。点火は、１番
気筒、６番気筒、５番気筒、２番気筒、３番気筒、４番
気筒の順番で実施されるものとする。この場合には、図
５に示す第４タイムチャートのように、５番気筒の燃料
噴射の完了直後に実施される燃料ポンプ１２の第１シリ
ンダ１２ａによる燃料吐出において、圧力センサ１６に
よって蓄圧室１１内の燃料圧力が監視され、５番気筒の
燃料噴射が開始される直前Ｅ１の燃料圧力と吐出完了直
後Ｅ２の燃料圧力とが一致するように吐出燃料量が制御
され、５番気筒の燃料噴射弁の現在における噴射率が直
接的に算出される。Next, the case of a six-cylinder internal combustion engine will be described. In this case, six fuel injection valves provided for each cylinder are connected to the common accumulator 11. The ignition is performed in the order of the first cylinder, the sixth cylinder, the fifth cylinder, the second cylinder, the third cylinder, and the fourth cylinder. In this case, as shown in the fourth time chart of FIG. 5, in the fuel discharge by the first cylinder 12a of the fuel pump 12 performed immediately after the completion of the fuel injection of the fifth cylinder, the pressure sensor 16 controls the pressure accumulation chamber 11 The fuel pressure in the cylinder is monitored, and the discharged fuel amount is controlled so that the fuel pressure of E1 immediately before the start of fuel injection of the fifth cylinder coincides with the fuel pressure of E2 immediately after the completion of discharge, and the fuel injection of the fifth cylinder is performed. The current injection rate of the valve is calculated directly.

【００２８】次に、図６に示す第５タイムチャートのよ
うに、燃料ポンプ１２の第１シリンダ１２ａの燃料吐出
において、圧力センサ１６によって蓄圧室１１内の燃料
圧力が監視され、６番気筒の燃料噴射が開始される直前
Ｆ１の燃料圧力と吐出完了直後Ｆ２の燃料圧力とが一致
するように吐出燃料量が制御され、５番気筒の燃料噴射
弁の現在における噴射率を考慮して６番気筒の燃料噴射
弁における現在の噴射率が算出される。Next, as shown in the fifth time chart of FIG. 6, during the fuel discharge of the first cylinder 12a of the fuel pump 12, the fuel pressure in the accumulator 11 is monitored by the pressure sensor 16, and The discharged fuel amount is controlled so that the fuel pressure of F1 immediately before the start of fuel injection and the fuel pressure of F2 immediately after the completion of the discharge are matched, and the fuel injection amount of the fifth cylinder is considered in consideration of the current injection rate of the fifth cylinder. The current injection rate at the cylinder fuel injection valve is calculated.

【００２９】次に、図７に示す第６タイムチャートのよ
うに、燃料ポンプ１２の第１シリンダ１２ａの燃料吐出
において、圧力センサ１６によって蓄圧室１１内の燃料
圧力が監視され、１番気筒の燃料噴射が開始される直前
Ｇ１の燃料圧力と吐出完了直後Ｇ２の燃料圧力とが一致
するように吐出燃料量が制御され、５番気筒の燃料噴射
弁の現在における噴射率及び６番気筒の燃料噴射弁の現
在における噴射率を考慮して１番気筒の燃料噴射弁にお
ける現在の噴射率が算出される。第２、第３、及び４番
気筒の燃料噴射弁における現在の噴射率は、燃料ポンプ
１２の第２シリンダ１２ｂの燃料吐出において、前述し
た第１シリンダ１２ａと同様な吐出燃料量制御を実施す
ることによって算出することができる。Next, as shown in a sixth time chart of FIG. 7, during the fuel discharge of the first cylinder 12a of the fuel pump 12, the fuel pressure in the accumulator 11 is monitored by the pressure sensor 16, and The discharged fuel amount is controlled so that the fuel pressure of G1 immediately before the start of fuel injection and the fuel pressure of G2 immediately after the completion of the discharge, and the current injection rate of the fuel injection valve of the fifth cylinder and the fuel of the sixth cylinder The current injection rate of the first cylinder fuel injection valve is calculated in consideration of the current injection rate of the injection valve. The current injection rates of the fuel injection valves of the second, third, and fourth cylinders perform the same discharge fuel amount control as the above-described first cylinder 12a in the fuel discharge of the second cylinder 12b of the fuel pump 12. Can be calculated.

【００３０】四気筒の内燃機関の場合で説明したよう
に、燃料ポンプ１２の第１シリンダ１２ａの吐出燃料量
制御によって、この燃料吐出の直後に燃料噴射が実施さ
れる２番気筒の燃料噴射弁の現在のおける噴射率を直接
的に算出することが可能である。また、燃料ポンプ１２
の第２シリンダ１２ｂの吐出燃料量制御によって、この
燃料吐出の直後に燃料噴射が実施される１番気筒の燃料
噴射弁の現在のおける噴射率を直接的に算出することが
可能である。As described in the case of the four-cylinder internal combustion engine, the fuel injection amount of the first cylinder 12a of the fuel pump 12 is controlled so that the fuel injection is performed immediately after the fuel is discharged. Can be directly calculated. The fuel pump 12
By controlling the amount of fuel discharged from the second cylinder 12b, it is possible to directly calculate the current injection rate of the fuel injection valve of the first cylinder in which fuel injection is performed immediately after this fuel discharge.

【００３１】６番気筒及び３番気筒の燃料噴射弁におけ
る噴射率は、前述したようにフューエルカット時におい
て燃料噴射を実施する以外は、燃料ポンプの現状の吐出
時期では直接的に算出することはできない。しかしなが
ら、前述したように、燃料ポンプ１２の第１シリンダ１
２ａの燃料吐出時期は、１サイクルの前半であれば自由
に変更可能であり、この燃料吐出時期を６番気筒の燃料
噴射の直前又は直後に変更することで、６番気筒の燃料
噴射弁の現在における噴射率を直接的に算出することが
可能となる。また、燃料ポンプ１２の第２シリンダ１２
ｂの燃料吐出時期は、１サイクルの後半であれば自由に
変更可能であり、それにより、３番気筒の燃料噴射弁の
現在における噴射率を直接的に算出することができる。The injection rates of the fuel injection valves of the sixth and third cylinders cannot be directly calculated at the current discharge timing of the fuel pump except that the fuel injection is performed at the time of fuel cut as described above. Can not. However, as described above, the first cylinder 1 of the fuel pump 12
The fuel discharge timing of 2a can be freely changed in the first half of one cycle, and by changing this fuel discharge timing immediately before or immediately after the fuel injection of the sixth cylinder, the fuel injection valve of the sixth cylinder can be changed. It is possible to directly calculate the current injection rate. The second cylinder 12 of the fuel pump 12
The fuel discharge timing of b can be freely changed in the second half of one cycle, whereby the current injection rate of the fuel injection valve of the third cylinder can be directly calculated.

【００３２】吸気非同期燃料噴射が実施される場合に
は、燃料噴射をかなり早めることが可能であり、それに
より、燃料ポンプ１２の燃料吐出時期を変更することな
く、各気筒の燃料噴射時期を早め、３番気筒の燃料噴射
時期を燃料ポンプ１２の第１シリンダ１２ａ又は第２シ
リンダ１２ｂの燃料吐出時期の直前又は直後にすること
で、３番気筒の燃料噴射弁の現在における噴射率を直接
的に算出可能となり、また、６番気筒の燃料噴射時期を
燃料ポンプ１２の第１シリンダ１２ａ又は第２シリンダ
１２ｂの燃料吐出時期の直前又は直後にすることで、６
番気筒の燃料噴射弁の現在における噴射率を直接的に算
出可能となる。When the intake asynchronous fuel injection is performed, the fuel injection can be considerably advanced, so that the fuel injection timing of each cylinder can be advanced without changing the fuel discharge timing of the fuel pump 12. By setting the fuel injection timing of the third cylinder immediately before or immediately after the fuel discharge timing of the first cylinder 12a or the second cylinder 12b of the fuel pump 12, the current injection rate of the fuel injection valve of the third cylinder can be directly adjusted. By setting the fuel injection timing of the sixth cylinder immediately before or immediately after the fuel discharge timing of the first cylinder 12a or the second cylinder 12b of the fuel pump 12,
It is possible to directly calculate the current injection rate of the fuel injection valve of the cylinder number.

【００３３】これまで、吸気非同期燃料噴射を実施する
吸気管噴射式の内燃機関について説明したが、本発明
は、このような内燃機関に限定されるものでなく、吸気
同期燃料噴射を実施する吸気管噴射式の内燃機関、又は
筒内噴射式の内燃機関にも適用可能である。また、前述
した四気筒及び六気筒の内燃機関だけに限定されず、前
述した考え方に基づき全ての多気筒内燃機関において、
各燃料噴射弁の現在のおける噴射率を把握することがで
きる。Although the internal combustion engine of the intake pipe injection type performing the intake asynchronous fuel injection has been described above, the present invention is not limited to such an internal combustion engine, and the intake pipe performing the intake synchronous fuel injection is not limited to such an internal combustion engine. The present invention is also applicable to a pipe injection type internal combustion engine or a direct injection type internal combustion engine. Further, the present invention is not limited to the above-described four-cylinder and six-cylinder internal combustion engines.
It is possible to grasp the current injection rate of each fuel injection valve.

【００３４】[0034]

【発明の効果】請求項１に記載の本発明による多気筒内
燃機関の燃料噴射量制御装置によれば、燃料ポンプの蓄
圧室への特定燃料吐出及びこの特定燃料吐出の直前又は
直後に燃料噴射が実施される複数の燃料噴射弁のうちの
第１燃料噴射弁の燃料噴射における蓄圧室内の二連続の
燃料圧力変化に対して、この二連続の燃料圧力変化の直
前直後における蓄圧室内の燃料圧力を一致させるように
燃料ポンプの特定燃料吐出における吐出燃料量が制御さ
れるために、特定燃料吐出の吐出燃料量と第１燃料噴射
弁の燃料噴射量とが一致し、第１燃料噴射弁の開弁時間
に基づき第１燃料噴射弁の現在の噴射率を算出すること
ができる。この噴射率の算出に際して、蓄圧室内の二つ
の燃料圧力が一致したことを監視すれば良く、測定値自
身の高い信頼性は必要ないために、高精度の圧力センサ
は不要である。According to the fuel injection amount control apparatus for a multi-cylinder internal combustion engine according to the first aspect of the present invention, the specific fuel is discharged to the accumulator of the fuel pump and the fuel is injected immediately before or immediately after the specific fuel is discharged. Is performed, the fuel pressure in the accumulator chamber immediately before and after the two consecutive fuel pressure changes in the accumulator during the fuel injection of the first fuel injector of the plurality of fuel injectors is executed. Is controlled so as to make the fuel pump amount coincide with the specific fuel discharge amount. Therefore, the discharge fuel amount of the specific fuel discharge and the fuel injection amount of the first fuel injection valve match, and the first fuel injection valve The current injection rate of the first fuel injection valve can be calculated based on the valve opening time. In calculating the injection rate, it is only necessary to monitor that the two fuel pressures in the accumulator chamber coincide with each other. Since high reliability of the measured value itself is not required, a high-precision pressure sensor is not required.

【００３５】また、請求項２に記載の本発明による多気
筒内燃機関の燃料噴射量制御装置によれば、請求項１に
記載の燃料噴射量制御装置において、第１燃料噴射弁の
現在の噴射率が算出された後に、燃料ポンプの蓄圧室へ
の特定燃料吐出と、第１燃料噴射弁の燃料噴射と、第１
燃料噴射弁の燃料噴射の直前又は直後に燃料噴射が実施
される複数の燃料噴射弁のうちの第２燃料噴射弁の燃料
噴射とにおける蓄圧室内の三連続の燃料圧力変化に対し
て、この三連続の燃料圧力変化の直前直後における蓄圧
室内の燃料圧力を一致させるように燃料ポンプの特定燃
料吐出における吐出燃料量が制御されるために、特定燃
料吐出の吐出燃料量と第１及び第２燃料噴射弁の燃料噴
射量の和とが一致し、第１及び第２燃料噴射弁の開弁時
間と第１燃料噴射弁の現在の噴射率に基づき、高精度の
圧力センサを使用することなく第２燃料噴射弁の現在に
おける噴射率を算出することができる。According to the fuel injection amount control apparatus for a multi-cylinder internal combustion engine according to the second aspect of the present invention, in the fuel injection amount control apparatus according to the first aspect, the current injection of the first fuel injection valve is performed. After the rate has been calculated, the specific fuel discharge to the accumulator of the fuel pump, the fuel injection of the first fuel injection valve,
In response to three consecutive changes in fuel pressure in the accumulator between the fuel injection of the second fuel injection valve and the fuel injection of the second fuel injection valve, the fuel injection of which is performed immediately before or immediately after the fuel injection of the fuel injection valve. Since the amount of fuel discharged at the time of specific fuel discharge of the fuel pump is controlled so that the fuel pressure in the accumulator immediately before and after the continuous fuel pressure change is equalized, the discharge fuel amount of the specific fuel discharge and the first and second fuels are controlled. The sum of the fuel injection amounts of the injectors coincides with each other, and based on the opening times of the first and second fuel injectors and the current injection rate of the first fuel injector, the fuel injection amount can be reduced without using a high-precision pressure sensor. The current injection rate of the two-fuel injection valve can be calculated.

【００３６】また、請求項３に記載の本発明による多気
筒内燃機関の燃料噴射量制御装置によれば、請求項１に
記載の燃料噴射量制御装置において、第１燃料噴射弁の
現在の噴射率が算出された後に、燃料ポンプの蓄圧室へ
の特定燃料吐出時期及び第１燃料噴射弁以外の特定燃料
噴射弁の燃料噴射時期の少なくとも一方を、燃料ポンプ
の特定燃料噴射吐出の直前又は直後に特定燃料噴射弁の
燃料噴射が実施されるように変化させ、燃料ポンプの特
定燃料吐出及び特定燃料噴射弁の燃料噴射における蓄圧
室内の二連続の燃料圧力変化に対して、二連続の燃料圧
力変化の直前直後における蓄圧室内の燃料圧力を一致さ
せるように燃料ポンプの特定燃料吐出における吐出燃料
量が制御されるために、特定燃料吐出の吐出燃料量と特
定燃料噴射弁の燃料噴射量とが一致し、特定燃料噴射弁
の開弁時間に基づき、高精度の圧力センサを使用するこ
となく特定燃料噴射弁の現在における噴射率を算出する
ことができる。According to the fuel injection amount control device for a multi-cylinder internal combustion engine according to the third aspect of the present invention, in the fuel injection amount control device according to the first aspect, the current injection of the first fuel injection valve is performed. After the rate is calculated, at least one of the specific fuel discharge timing of the fuel pump into the pressure accumulation chamber and the fuel injection timing of the specific fuel injection valve other than the first fuel injection valve is determined immediately before or immediately after the specific fuel injection discharge of the fuel pump. The fuel pressure of the specific fuel injection valve is changed so that the fuel pressure of the specific fuel injection and the fuel injection of the specific fuel injection valve in the accumulator chamber change twice. Since the amount of discharged fuel at the time of specific fuel discharge of the fuel pump is controlled so that the fuel pressure in the accumulator immediately before and after the change is equalized, the discharged fuel amount of the specific fuel discharge and the fuel of the specific fuel injection valve are controlled. Injection amount and matches, based on the opening time of a particular fuel injection valve, it is possible to calculate the injection rate at the current specific fuel injection valve without the use of pressure sensor with high accuracy.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明による多気筒内燃機関の燃料噴射量制御
装置の実施形態を示す概略図である。FIG. 1 is a schematic diagram showing an embodiment of a fuel injection amount control device for a multi-cylinder internal combustion engine according to the present invention.

【図２】四気筒内燃機関における通常時の燃料ポンプの
吐出制御及び燃料噴射弁の燃料噴射制御を示す第１タイ
ムチャートである。FIG. 2 is a first time chart showing a discharge control of a fuel pump and a fuel injection control of a fuel injection valve in a normal state in a four-cylinder internal combustion engine.

【図３】四気筒内燃機関における燃料噴射弁の噴射率を
把握するための燃料ポンプの吐出制御を示す第２タイム
チャートである。FIG. 3 is a second time chart showing a discharge control of a fuel pump for grasping an injection rate of a fuel injection valve in a four-cylinder internal combustion engine.

【図４】四気筒内燃機関における燃料噴射弁の噴射率を
把握するための燃料ポンプの吐出制御を示す第３タイム
チャートである。FIG. 4 is a third time chart showing discharge control of a fuel pump for grasping an injection rate of a fuel injection valve in a four-cylinder internal combustion engine.

【図５】六気筒内燃機関における燃料噴射弁の噴射率を
把握するための燃料ポンプの吐出制御を示す第４タイム
チャートである。FIG. 5 is a fourth time chart showing discharge control of a fuel pump for grasping an injection rate of a fuel injection valve in a six-cylinder internal combustion engine.

【図６】六気筒内燃機関における燃料噴射弁の噴射率を
把握するための燃料ポンプの吐出制御を示す第５タイム
チャートである。FIG. 6 is a fifth time chart showing discharge control of a fuel pump for grasping an injection rate of a fuel injection valve in a six-cylinder internal combustion engine.

【図７】六気筒内燃機関における燃料噴射弁の噴射率を
把握するための燃料ポンプの吐出制御を示す第６タイム
チャートである。FIG. 7 is a sixth time chart showing discharge control of a fuel pump for grasping an injection rate of a fuel injection valve in a six-cylinder internal combustion engine.

【符号の説明】[Explanation of symbols]

７…燃料噴射弁 １０…内燃機関本体 １１…蓄圧室 １２…燃料ポンプ １２ａ…第１シリンダ １２ｂ…第２シリンダ １６…圧力センサ ２０…制御装置 7 Fuel injection valve 10 Internal combustion engine main body 11 Accumulation chamber 12 Fuel pump 12a First cylinder 12b Second cylinder 16 Pressure sensor 20 Control device

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 37/00 F02D 41/14 330 F02D 41/40 ──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. 7 , DB name) F02M 37/00 F02D 41/14 330 F02D 41/40

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 蓄圧室と、前記蓄圧室に接続された複数
の燃料噴射弁と、前記蓄圧室へ燃料を吐出する燃料ポン
プ、とを具備し、前記燃料ポンプの前記蓄圧室への特定
燃料吐出及び前記特定燃料吐出の直前又は直後に燃料噴
射が実施される前記複数の燃料噴射弁のうちの第１燃料
噴射弁の燃料噴射における前記蓄圧室内の二連続の燃料
圧力変化に対して、前記二連続の燃料圧力変化の直前直
後における前記蓄圧室内の燃料圧力を一致させるように
前記燃料ポンプの前記特定燃料吐出における吐出燃料量
を制御し、前記吐出燃料量を前記第１燃料噴射弁の燃料
噴射量として前記第１燃料噴射弁の現在の噴射率を算出
することを特徴とする多気筒内燃機関の燃料噴射量制御
装置。An accumulator, a plurality of fuel injection valves connected to the accumulator, and a fuel pump for discharging fuel to the accumulator, wherein a specific fuel for the fuel pump to the accumulator is provided. In response to two consecutive fuel pressure changes in the accumulator during fuel injection of the first fuel injection valve of the plurality of fuel injection valves in which fuel injection is performed immediately before or immediately after the discharge and the specific fuel discharge, Controlling the amount of fuel discharged in the specific fuel discharge of the fuel pump so as to match the fuel pressure in the pressure accumulating chamber immediately before and after two consecutive fuel pressure changes, and controlling the discharged fuel amount to the fuel of the first fuel injection valve; A fuel injection amount control device for a multi-cylinder internal combustion engine, wherein a current injection rate of the first fuel injection valve is calculated as an injection amount. 【請求項２】 前記第１燃料噴射弁の現在の噴射率が算
出された後に、前記燃料ポンプの前記蓄圧室への前記特
定燃料吐出と、前記第１燃料噴射弁の燃料噴射と、前記
第１燃料噴射弁の燃料噴射の直前又は直後に燃料噴射が
実施される前記複数の燃料噴射弁のうちの第２燃料噴射
弁の燃料噴射とにおける前記蓄圧室内の三連続の燃料圧
力変化に対して、前記三連続の燃料圧力変化の直前直後
における前記蓄圧室内の燃料圧力を一致させるように前
記燃料ポンプの前記特定燃料吐出における吐出燃料量を
制御し、前記吐出燃料量を前記第１及び第２燃料噴射弁
の燃料噴射量の和として前記第１燃料噴射弁の現在の噴
射率に基づき前記第２燃料噴射弁の現在の噴射率を算出
することを特徴とする請求項１に記載の多気筒内燃機関
の燃料噴射量制御装置。2. After the current injection rate of the first fuel injection valve is calculated, the specific fuel discharge to the accumulator of the fuel pump, the fuel injection of the first fuel injection valve, and the For three consecutive fuel pressure changes in the accumulator chamber between the fuel injection of the second fuel injection valve and the fuel injection of the second fuel injection valve in which the fuel injection is performed immediately before or immediately after the fuel injection of one fuel injection valve. Controlling the amount of fuel discharged in the specific fuel discharge of the fuel pump so that the fuel pressure in the accumulator immediately before and after the three consecutive changes in fuel pressure is changed, and controlling the amount of discharged fuel to the first and second fuel pressures. The multi-cylinder according to claim 1, wherein a current injection rate of the second fuel injection valve is calculated based on a current injection rate of the first fuel injection valve as a sum of fuel injection amounts of the fuel injection valves. Fuel injection amount control system for internal combustion engine Place. 【請求項３】 前記第１燃料噴射弁の現在の噴射率が算
出された後に、前記燃料ポンプの前記蓄圧室への特定燃
料吐出時期及び前記第１燃料噴射弁以外の特定燃料噴射
弁の燃料噴射時期の少なくとも一方を、前記燃料ポンプ
の特定燃料噴射吐出の直前又は直後に前記特定燃料噴射
弁の燃料噴射が実施されるように変化させ、前記燃料ポ
ンプの特定燃料吐出及び前記特定燃料噴射弁の燃料噴射
における前記蓄圧室内の二連続の燃料圧力変化に対し
て、前記二連続の燃料圧力変化の直前直後における前記
蓄圧室内の燃料圧力を一致させるように前記燃料ポンプ
の前記特定燃料吐出における吐出燃料量を制御し、前記
吐出燃料量を前記特定燃料噴射弁の燃料噴射量として前
記特定燃料噴射弁の現在の噴射率を算出することを特徴
とする請求項１に記載の多気筒内燃機関の燃料噴射量制
御装置。3. After a current injection rate of the first fuel injection valve is calculated, a specific fuel discharge timing of the fuel pump to the accumulator and a fuel of a specific fuel injection valve other than the first fuel injection valve. At least one of the injection timings is changed such that the fuel injection of the specific fuel injection valve is performed immediately before or immediately after the specific fuel injection discharge of the fuel pump, and the specific fuel discharge of the fuel pump and the specific fuel injection valve are performed. The discharge at the specific fuel discharge of the fuel pump is adjusted so that the fuel pressure in the accumulator immediately before and after the two consecutive fuel pressure changes coincides with the two consecutive fuel pressure changes in the accumulator during the fuel injection. 2. The fuel injection amount of the specific fuel injection valve is calculated as a fuel injection amount of the specific fuel injection valve by controlling a fuel amount. A fuel injection amount control device for a multi-cylinder internal combustion engine.
JP13664396A 1996-05-30 1996-05-30 Fuel injection amount control device for multi-cylinder internal combustion engine Expired - Lifetime JP3146976B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13664396A JP3146976B2 (en) 1996-05-30 1996-05-30 Fuel injection amount control device for multi-cylinder internal combustion engine

Applications Claiming Priority (1)

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JP13664396A JP3146976B2 (en) 1996-05-30 1996-05-30 Fuel injection amount control device for multi-cylinder internal combustion engine

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JPH09317583A JPH09317583A (en) 1997-12-09
JP3146976B2 true JP3146976B2 (en) 2001-03-19

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