JP2002021607A - Air/fuel ratio control device of engine - Google Patents

Air/fuel ratio control device of engine

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Publication number
JP2002021607A
JP2002021607A JP2000205388A JP2000205388A JP2002021607A JP 2002021607 A JP2002021607 A JP 2002021607A JP 2000205388 A JP2000205388 A JP 2000205388A JP 2000205388 A JP2000205388 A JP 2000205388A JP 2002021607 A JP2002021607 A JP 2002021607A
Authority
JP
Japan
Prior art keywords
water temperature
engine
temperature
air
fuel ratio
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.)
Pending
Application number
JP2000205388A
Other languages
Japanese (ja)
Inventor
Tetsuro Sugiyama
哲朗 杉山
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.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP2000205388A priority Critical patent/JP2002021607A/en
Publication of JP2002021607A publication Critical patent/JP2002021607A/en
Pending legal-status Critical Current

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  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To enhance drivability by making an air/fuel ratio during warming up of an engine and stabilizing the warming up. SOLUTION: In the air/fuel ratio control device of an engine, an injection amount of fuel injected by a fuel injection valve is increase-corrected by a correction amount for actual water temperature set corresponding to an actual water temperature detected by a water temperature sensor and the air/fuel ratio is controlled so as to become a target air/fuel ratio. In the case where the actual water temperature detected by the water temperature sensor exists between a complete warming up neighborhood temperature in the state that it arrives at near a complete warming up state of engine and a complete warming up arrival temperature in the state that it arrives at the complete warming up state, a correction water temperature is determined based on the actual water temperature. The injection amount of fuel injected by the fuel injection valve is increase-corrected by a correction amount for the correction water temperature set corresponding to this correction water temperature. A control means for controlling an air/fuel ratio of engine is provided such that it becomes a target air/fuel ratio.

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】この発明はエンジンの空燃比
制御装置に係り、特に、エンジンの暖機運転中の空燃比
を適正化し得て、エンジンの暖機運転を安定させ得て、
ドライバビリティを向上し得るエンジンの空燃比制御装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-fuel ratio control device for an engine, and more particularly, to an air-fuel ratio optimization during an engine warm-up operation and a stable engine warm-up operation.
The present invention relates to an engine air-fuel ratio control device capable of improving drivability.

【０００２】[0002]

【従来の技術】車両に搭載されるエンジンには、排気有
害成分や燃料消費率等の問題の対応策として燃料を噴射
する燃料噴射弁を設け、エンジンの空燃比が目標空燃比
になるよう制御するエンジンの空燃比制御装置を設けた
ものがある。2. Description of the Related Art An engine mounted on a vehicle is provided with a fuel injection valve for injecting fuel as a countermeasure against problems such as harmful exhaust components and fuel consumption rate, and controls the air-fuel ratio of the engine to a target air-fuel ratio. Some engines are provided with an air-fuel ratio control device for the engine.

【０００３】空燃比制御装置は、エンジン回転数や吸入
空気量等から燃料噴射弁の基本となる燃料噴射量を決定
し、この基本となる燃料噴射量をエンジンの水温や加減
速状態等に応じた設定された各種補正量により増量補正
し、エンジンの空燃比が目標空燃比になるよう制御す
る。The air-fuel ratio control device determines a basic fuel injection amount of a fuel injection valve from an engine speed, an intake air amount, and the like, and determines the basic fuel injection amount according to a water temperature of the engine, an acceleration / deceleration state, and the like. The increase correction is performed by the set various correction amounts, and the air-fuel ratio of the engine is controlled so as to become the target air-fuel ratio.

【０００４】このようなエンジンの空燃比制御装置とし
ては、特開平７−２０８２５０号公報、特開平８−４９
５８１号公報、特開平９−２８００９３号公報に開示さ
れるものがある。[0004] Such an air-fuel ratio control device for an engine is disclosed in JP-A-7-208250 and JP-A-8-49.
581 and Japanese Patent Application Laid-Open No. 9-280093.

【０００５】特開平７−２０８２５０号公報に開示され
るものは、水温センサにより検出された冷却水温度をな
まし係数に基づいてなまし処理してなまし冷却水温度を
求め、このなまし冷却水温度を基に燃料供給量の暖機増
量補正量及び吸気の空燃比のフィードバック制御開始温
度を設定するものである。[0005] Japanese Patent Application Laid-Open No. 7-208250 discloses a method in which a cooling water temperature detected by a water temperature sensor is smoothed based on a smoothing coefficient to obtain a cooling water temperature. Based on the water temperature, a warm-up increase correction amount of the fuel supply amount and a feedback control start temperature of the air-fuel ratio of the intake air are set.

【０００６】特開平８−４９５８１号公報に開示される
ものは、機関始動後所定時間内において、供給燃料の霧
化状態を推定し、推定した供給燃料の霧化状態に基づい
て、機関冷却水温度に応じて設定される目標リーン空燃
比を補正して、リーン化制御を行うものである。[0006] Japanese Patent Application Laid-Open No. 8-49581 discloses a technique for estimating the atomization state of supplied fuel within a predetermined time after starting the engine, and for determining the engine cooling water based on the estimated atomized state of supplied fuel. The lean control is performed by correcting a target lean air-fuel ratio set according to the temperature.

【０００７】特開平９−２８００９３号公報に開示され
るものは、少なくともエンジン回転数に基づいて基本と
なる燃料噴射量を演算し、エンジンの過渡時に過渡状態
に応じた過渡増量値で基本となる燃料噴射量を増量補正
する際に、過渡時の冷却水温度に基づいて暖機状態を判
定し、暖機中においては冷却水温度により過渡増量値を
設定し、暖機完了時点からは過渡増量値を予め設定した
所定値になるまで漸次減少させるものである。The technique disclosed in Japanese Patent Application Laid-Open No. 9-280093 calculates a basic fuel injection amount based on at least the engine speed, and basically provides a transient increase value according to a transient state when the engine is in a transient state. When increasing the fuel injection amount, the warm-up state is determined based on the cooling water temperature during the transition, and during the warm-up, the transient increasing value is set according to the cooling water temperature. The value is gradually reduced until a predetermined value is set.

【０００８】[0008]

【発明が解決しようとする課題】ところで、従来のエン
ジンの空燃比制御装置においては、エンジンの暖機運転
時に、エンジン回転数や吸入空気量等から決定される燃
料噴射量を、エンジンの水温に応じて設定された水温用
補正量により増量補正している。By the way, in the conventional air-fuel ratio control device for an engine, during the warm-up operation of the engine, the fuel injection amount determined from the engine speed, the amount of intake air, and the like is changed to the water temperature of the engine. The increase correction is performed by the water temperature correction amount set accordingly.

【０００９】ところが、水温センサの検出する水温は、
エンジンの暖機にともなって上昇し、完全暖機状態の水
温に到達するが、エンジン本体（特に吸気ポート付近）
は、冷却水に比べ昇温に時間がかかるため、水温センサ
の検出する水温が、完全暖機状態の水温に到達していて
も、エンジン本体温度は完全暖機状態の温度に到達して
いない場合がある。つまり、水温センサの検出する水温
では、エンジンの状態を性格に把握できない場合があ
る。このため、水温を補正に使用する場合には、完全暖
機状態になった直後の水温か、完全暖機状態になってか
ら長時間が経過した後の水温かを判断できないため、補
正がかならずしも適切なものとならない問題がある。However, the water temperature detected by the water temperature sensor is
The temperature rises with the warm-up of the engine and reaches the water temperature of the fully warmed-up state. However, the engine itself (especially near the intake port)
Takes a longer time to raise the temperature than the cooling water, so even if the water temperature detected by the water temperature sensor reaches the water temperature in the fully warmed-up state, the engine body temperature does not reach the temperature in the fully warmed-up state There are cases. That is, there is a case where the state of the engine cannot be accurately grasped with the water temperature detected by the water temperature sensor. For this reason, when using the water temperature for correction, it is not always possible to determine whether the water temperature is immediately after the state of complete warm-up or after a long time from the state of complete warm-up. There are issues that are not appropriate.

【００１０】また、暖機運転時のエンジンが必要とする
補正量は、水温センサの検出する水温により設定される
補正量でなく、エンジンのエンジン本体温度、例えば、
シリンダや吸気ポート等の温度により設定される補正量
である。このため、水温から設定される補正量では、水
温とエンジン本体温度との差に起因して、実際にエンジ
ンが要求するエンジン本体温度により設定される補正量
に対してずれを生じる問題がある。The correction amount required by the engine during the warm-up operation is not the correction amount set by the water temperature detected by the water temperature sensor, but the engine body temperature of the engine, for example,
This is a correction amount set based on the temperature of the cylinder, the intake port, and the like. For this reason, there is a problem in that the correction amount set based on the water temperature is different from the correction amount set based on the engine body temperature actually required by the engine due to the difference between the water temperature and the engine body temperature.

【００１１】特に、完全暖機状態の水温、例えば、８０
℃以上の状況では、完全暖機状態になってから長時間が
経過した後の水温８０℃におけるエンジン本体温度との
差に対して、冷機状態から完全暖機状態の水温８０℃に
なった直後のエンジン本体温度との差が、大きくなる問
題がある。In particular, the water temperature in a fully warmed state, for example, 80
In the case of a temperature higher than or equal to ℃, the difference from the temperature of the engine body at a water temperature of 80 ℃ after a long time elapses from the complete warm-up state, immediately after the water temperature from the cold state to the fully warm-up state of 80 ℃ There is a problem that the difference from the engine body temperature becomes large.

【００１２】一般的に、空燃比制御装置において設定さ
れる完全暖機状態の補正量は、完全暖機状態になってか
ら長時間が経過した状態に合わせて決定される。このた
め、エンジンが冷機状態から完全暖機状態の水温８０℃
になった直後は、水温とエンジン本体温度との差に起因
して要求される補正量にずれを生じることにより、補正
量が不足して空燃比の悪化を招き、エンジンの暖機運転
を不安定にさせ、ドライバビリティを悪化させる不都合
がある。In general, the correction amount of the complete warm-up state set in the air-fuel ratio control device is determined according to a state where a long time has elapsed since the complete warm-up state. Therefore, the water temperature is 80 ° C. when the engine is in a cold state to a fully warmed-up state.
Immediately after the engine temperature becomes lower, the required correction amount shifts due to the difference between the water temperature and the engine body temperature. There is an inconvenience that it stabilizes and deteriorates drivability.

【００１３】[0013]

【課題を解決するための手段】そこで、この発明は、上
述不都合を除去するために、エンジンに燃料を噴射する
燃料噴射弁を設け、前記エンジンの冷却水の実水温を検
出する水温センサを設け、この水温センサの検出する実
水温に応じて設定された実水温補正量により前記燃料噴
射弁の噴射する燃料噴射量を増量補正し、前記エンジン
の空燃比が目標空燃比になるよう制御するエンジンの空
燃比制御装置において、前記水温センサの検出する実水
温が前記エンジンの完全暖機状態近傍に到達した状態の
完全暖機近傍温度から前記完全暖機状態に到達した状態
の完全暖機到達温度までの間に存する場合は前記実水温
に基づいて補正水温を求め、この補正水温に応じて設定
された補正水温用補正量により前記燃料噴射弁の噴射す
る燃料噴射量を増量補正し、前記エンジンの空燃比が目
標空燃比になるよう制御する制御手段を設けたことを特
徴とする。Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a fuel injection valve for injecting fuel into an engine, and a water temperature sensor for detecting an actual water temperature of cooling water of the engine. An engine for increasing and correcting the fuel injection amount injected by the fuel injection valve by an actual water temperature correction amount set in accordance with the actual water temperature detected by the water temperature sensor, and controlling the air-fuel ratio of the engine to be a target air-fuel ratio. In the air-fuel ratio control device, the complete warm-up reaching temperature in the state in which the actual water temperature detected by the water temperature sensor has reached the complete warm-up state from the temperature in the vicinity of the fully warm-up state in the state in which the actual water temperature has reached the vicinity in the fully warm-up state of the engine. In the case where the water temperature is within the range, the corrected water temperature is obtained based on the actual water temperature, and the fuel injection amount injected by the fuel injection valve is increased by the corrected water temperature correction amount set according to the corrected water temperature. It corrected, wherein the air-fuel ratio of the engine is provided with a control means for controlling so that the target air-fuel ratio.

【００１４】[0014]

【発明の実施の形態】この発明のエンジンの空燃比制御
装置は、制御手段によって、水温センサの検出する実水
温が完全暖機状態近傍に到達した状態の完全暖機近傍温
度から完全暖機状態に到達した状態の完全暖機到達温度
までの間に存する場合は、実水温に基づいて補正水温を
求め、この補正水温に応じて設定された補正水温用補正
量により燃料噴射弁の噴射する燃料噴射量を増量補正
し、エンジンの空燃比が目標空燃比になるよう制御する
ことにより、エンジンが冷機状態から完全暖機状態にな
る際の水温センサが検出する実水温とエンジン本体温度
との差に起因する補正量のずれを補償し得て、エンジン
の暖機進捗状況に応じて燃料噴射量を適切に補正するこ
とができる。In the air-fuel ratio control device for an engine according to the present invention, the control means changes the state of the engine from the temperature in the vicinity of the complete warm-up when the actual water temperature detected by the water temperature sensor has reached the vicinity of the state of the complete warm-up. In the case where the temperature of the fuel injection valve reaches the fully warm-up reaching temperature in a state where the temperature has reached, the corrected water temperature is obtained based on the actual water temperature, and the fuel injected by the fuel injection valve is calculated based on the corrected water temperature correction amount set in accordance with the corrected water temperature. The difference between the actual water temperature detected by the water temperature sensor and the engine body temperature when the engine changes from a cold state to a complete warm-up state by controlling the air-fuel ratio of the engine to the target air-fuel ratio by increasing the injection amount and correcting it. Therefore, it is possible to compensate for the deviation of the correction amount caused by the above, and to appropriately correct the fuel injection amount according to the progress of warming up the engine.

【００１５】[0015]

【実施例】以下図面に基づいて、この発明の実施例を説
明する。図１〜図４は、この発明の実施例を示すもので
ある。図４において、２は図示しない車両に搭載された
エンジンである。エンジン２は、エンジン本体を構成す
るシリンダブロック４と、シリンダヘッド６と、ヘッド
カバー８と、ピストン１０と、燃焼室１２と、吸気ポー
ト１４と、排気ポート１６と、吸気弁１８と、排気弁２
０とを有している。Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 4, reference numeral 2 denotes an engine mounted on a vehicle (not shown). The engine 2 includes a cylinder block 4, a cylinder head 6, a head cover 8, a piston 10, a combustion chamber 12, an intake port 14, an exhaust port 16, an intake valve 18, an exhaust valve 2,
0.

【００１６】エンジン２は、吸気系としてエアクリーナ
２２と吸気管２４とスロットルボディ２６とサージタン
ク２８と吸気マニホルド３０とを順次に接続し、吸気ポ
ート１４に連通する吸気通路３２を設けている。スロッ
トルボディ２６の吸気通路３２には、スロットルバルブ
３４を設けている。また、エンジン２は、排気系として
排気マニホルド３６と排気管３８と触媒コンバータ４０
とを順次に接続し、排気ポート１６に連通する排気通路
４２を設けている。The engine 2 has an air intake passage 32 communicating with the intake port 14 by sequentially connecting an air cleaner 22, an intake pipe 24, a throttle body 26, a surge tank 28, and an intake manifold 30 as an intake system. A throttle valve 34 is provided in the intake passage 32 of the throttle body 26. The engine 2 includes an exhaust manifold 36, an exhaust pipe 38, and a catalytic converter 40 as an exhaust system.
Are sequentially connected, and an exhaust passage 42 communicating with the exhaust port 16 is provided.

【００１７】エンジン２は、ヘッドカバー８にイグニシ
ョンコイル４４を取付けて設けている。また、エンジン
２は、ＰＣＶバルブ４６を介してヘッドカバー８内とサ
ージタンク２８の吸気通路３２とを連通する第１ブロー
バイガス通路４８を設け、エアクリーナ２２直下流の吸
気通路３２とを連通する第２ブローバイガス通路５０を
設けている。The engine 2 is provided with the ignition coil 44 attached to the head cover 8. Further, the engine 2 has a first blow-by gas passage 48 that connects the inside of the head cover 8 and the intake passage 32 of the surge tank 28 via the PCV valve 46, and a second blow-by gas passage 48 that communicates with the intake passage 32 immediately downstream of the air cleaner 22. A blow-by gas passage 50 is provided.

【００１８】エンジン２は、吸気マニホルド３０に燃焼
室１２に指向させて燃料噴射弁５２を設けている。燃料
噴射弁５２は、燃料分配管５４を介して燃料供給通路５
６により燃料タンク５８に連絡されている。燃料タンク
５８内には、燃料ポンプ６０と燃料フィルタ６２と燃料
圧力調整部６４とを設けている。The engine 2 has a fuel injection valve 52 provided in the intake manifold 30 so as to face the combustion chamber 12. The fuel injection valve 52 is connected to the fuel supply passage 5 through a fuel distribution pipe 54.
6 communicates with the fuel tank 58. In the fuel tank 58, a fuel pump 60, a fuel filter 62, and a fuel pressure adjusting unit 64 are provided.

【００１９】燃料タンク５８の燃料は、燃料ポンプ６０
により圧送され、燃料フィルタ６２により塵埃を除去さ
れ、燃料圧力調整部６４により圧力を調整されて燃料供
給通路５６に供給され、燃料分配管５４により各燃焼室
１２の燃料噴射弁５２に夫々分配して供給される。燃料
圧力調整部６４により圧力を調整された余剰の燃料は、
燃料タンク５８内に戻される。The fuel in the fuel tank 58 is supplied to a fuel pump 60.
The dust is removed by the fuel filter 62, the dust is removed by the fuel filter 62, the pressure is adjusted by the fuel pressure adjusting unit 64, the pressure is supplied to the fuel supply passage 56, and the fuel is distributed to the fuel injection valve 52 of each combustion chamber 12 by the fuel distribution pipe 54. Supplied. The surplus fuel whose pressure has been adjusted by the fuel pressure adjusting unit 64 is
It is returned into the fuel tank 58.

【００２０】燃料タンク５８には、２ウエイチェックバ
ルブ６６を介してエバポ通路６８の一端側を連通してい
る。エバポ通路６８の他端側は、キャニスタ７０に連通
している。キャニスタ７０には、パージ通路７２の一端
側を連通している。パージ通路７２の他端側は、スロッ
トルボディ２６の吸気通路３２に連通している。The fuel tank 58 communicates with one end of an evaporation passage 68 via a two-way check valve 66. The other end of the evaporation passage 68 communicates with the canister 70. One end of the purge passage 72 communicates with the canister 70. The other end of the purge passage 72 communicates with the intake passage 32 of the throttle body 26.

【００２１】前記エンジン２は、スロットルバルブ３４
を迂回してスロットルボディ２６の吸気通路３２とサー
ジタンク２８の吸気通路３２とを連通するアイドル空気
通路７４を設けている。アイドル空気通路７４の途中に
は、アイドル空気量を調整するアイドル空気量制御弁７
６を設けている。The engine 2 includes a throttle valve 34
And an idle air passage 74 that connects the intake passage 32 of the throttle body 26 and the intake passage 32 of the surge tank 28 to bypass the air passage. In the middle of the idle air passage 74, an idle air amount control valve 7 for adjusting an idle air amount is provided.
6 are provided.

【００２２】このエンジン２には、クランク角及びエン
ジン回転数を検出するクランク角センサ７８を設け、冷
却水温度を検出する水温センサ８０をウォータジャケッ
トに臨ませて設け、スロットルバルブ３４のスロットル
開度を検出するスロットルセンサ８２をスロットルボデ
ィ２６に設け、吸気圧を検出する吸気圧センサ８４をサ
ージタンク２８に設け、排気中の酸素濃度を検出するＯ
２センサ８６を排気マニホルド３６に設け、エンジン２
のノッキングを検出するノックセンサ８８をシリンダブ
ロック４に設けている。The engine 2 is provided with a crank angle sensor 78 for detecting a crank angle and an engine speed, and a water temperature sensor 80 for detecting a coolant temperature is provided facing the water jacket. Is provided on the throttle body 26, an intake pressure sensor 84 for detecting the intake pressure is provided on the surge tank 28, and an O sensor for detecting the oxygen concentration in the exhaust is provided.
2 sensor 86 is provided in the exhaust manifold 36 and the engine 2
A knock sensor 88 for detecting knocking of the cylinder block 4 is provided on the cylinder block 4.

【００２３】前記イグニションコイル４４と燃料噴射弁
５２と燃料ポンプ６０とアイドル空気量制御弁７６とク
ランク角センサ７８と水温センサ８０とスロットルセン
サ８２と吸気圧センサ８４とＯ２センサ８６とノックセ
ンサ８８とは、空燃比制御装置９０を構成する制御手段
９２に接続されている。制御手段９２には、メインスイ
ッチ９４とフューズ９６とを介してバッテリ９８が接続
されている。The ignition coil 44, fuel injection valve 52, fuel pump 60, idle air amount control valve 76, crank angle sensor 78, water temperature sensor 80, throttle sensor 82, intake pressure sensor 84, O2 sensor 86, knock sensor 88, Are connected to control means 92 constituting the air-fuel ratio control device 90. A battery 98 is connected to the control means 92 via a main switch 94 and a fuse 96.

【００２４】空燃比制御装置９０は、制御手段９２によ
って、クランク角センサ７８〜ノックセンサ８８から入
力する信号により、運転状態に応じて燃料噴射量や点火
時期、アイドル空気量を制御する。The air-fuel ratio control device 90 controls the fuel injection amount, the ignition timing, and the idle air amount according to the operating state by the control means 92 based on signals input from the crank angle sensor 78 to the knock sensor 88.

【００２５】空燃比制御装置９０は、エンジン２に燃料
を噴射する燃料噴射弁５２を設け、エンジン２の冷却水
の実水温ＴＨＷを検出する水温センサ８０を設け、図３
に示す如く、この水温センサ８０の検出する実水温ＴＨ
Ｗに応じて設定された実水温用補正量Ｋｎにより燃料噴
射弁５２の噴射する燃料噴射量を増量補正し、エンジン
２の空燃比が目標空燃比になるよう制御する。The air-fuel ratio control device 90 is provided with a fuel injection valve 52 for injecting fuel into the engine 2 and a water temperature sensor 80 for detecting the actual water temperature THW of the cooling water of the engine 2.
, The actual water temperature TH detected by the water temperature sensor 80
The fuel injection amount injected by the fuel injection valve 52 is increased and corrected by the actual water temperature correction amount Kn set in accordance with W, and the air-fuel ratio of the engine 2 is controlled to be the target air-fuel ratio.

【００２６】このエンジン２の空燃比制御装置９０は、
制御手段９２によって、水温センサ８０の検出する実水
温ＴＨＷが、エンジン２の完全暖機状態近傍に上昇して
到達した状態の完全暖機近傍温度Ｔ２から完全暖機状態
に到達した状態の完全暖機到達温度Ｔ３までの間に存す
る場合は、実水温ＴＨＷに基づいて補正水温ＴＨＥを求
め、この補正水温ＴＨＥに応じて設定された補正水温用
補正量により燃料噴射弁５２の噴射する燃料噴射量を増
量補正し、エンジン２の空燃比が目標空燃比になるよう
制御する。The air-fuel ratio control device 90 of the engine 2
The control means 92 causes the actual water temperature THW detected by the water temperature sensor 80 to rise to near the fully warmed-up state of the engine 2 and to reach the fully warmed-up state when the temperature reaches the fully warmed-up state. In the case where the temperature is within the vehicle arrival temperature T3, the corrected water temperature THE is obtained based on the actual water temperature THW, and the fuel injection amount injected by the fuel injection valve 52 is calculated based on the corrected water temperature correction amount set according to the corrected water temperature THE. Is controlled to increase the air-fuel ratio of the engine 2 to the target air-fuel ratio.

【００２７】前記制御手段９２は、図３に示す如く、実
水温ＴＨＷに応じて予め設定された実水温用補正量マッ
プ設け、この実水温用補正量マップにおける完全暖機到
達温度Ｔ３（図３においては８０℃）に最近接する実水
温ＴＨＷを完全暖機近傍温度Ｔ２（図３においては７０
℃）として設定し、温度上昇率に制限値ΔＴによる制限
を加えることにより補正水温ＴＨＥを求める。As shown in FIG. 3, the control means 92 provides an actual water temperature correction amount map preset according to the actual water temperature THW, and the complete warm-up reaching temperature T3 (FIG. 3) in the actual water temperature correction amount map. The actual water temperature THW closest to 80 ° C. in FIG.
° C), and the temperature increase rate is limited by a limit value ΔT to obtain the corrected water temperature THE.

【００２８】前記制御手段９２は、実水温ＴＨＷが完全
暖機近傍温度Ｔ２よりも低い補正禁止始動時温度Ｔ１未
満からのエンジン２の暖機運転時に完全暖機近傍温度Ｔ
２から完全暖機到達温度Ｔ３までの間に補正水温用補正
量により燃料噴射弁５２の噴射する燃料噴射量を増量補
正し、また、実水温ＴＨＷが補正禁止始動時温度Ｔ１以
上からのエンジン２の暖機運転時に実水温用補正量によ
り燃料噴射弁５２の噴射する燃料噴射量を増量補正す
る。When the engine 2 is warmed up from a temperature T1 at which the actual water temperature THW is lower than the correction prohibition start temperature T1 lower than the temperature T2 near the complete warm-up, the control means 92 controls the temperature T near the perfect warm-up.
The fuel injection amount injected by the fuel injection valve 52 is increased and corrected by the corrected water temperature correction amount from the temperature 2 to the complete warm-up reaching temperature T3. During the warm-up operation, the fuel injection amount injected by the fuel injection valve 52 is increased and corrected by the actual water temperature correction amount.

【００２９】次に、エンジン２の空燃比制御装置９０の
作用を説明する。Next, the operation of the air-fuel ratio control device 90 of the engine 2 will be described.

【００３０】空燃比制御装置９０は、水温センサ８０の
検出する実水温ＴＨＷと、制御において補正に使用する
補正水温ＴＨＥとを分けて設定している。補正水温ＴＨ
Ｅは、エンジン２のエンジン本体温度に相当する温度で
あり、エンジン２の始動時に検出される実水温ＴＨＷを
基に吸気温及び運転時間等をパラメータとして決定され
る。The air-fuel ratio controller 90 sets the actual water temperature THW detected by the water temperature sensor 80 and the corrected water temperature THE used for correction in control separately. Corrected water temperature TH
E is a temperature corresponding to the engine body temperature of the engine 2, and is determined based on the actual water temperature THW detected when the engine 2 is started, using the intake air temperature, the operation time, and the like as parameters.

【００３１】空燃比制御装置９０は、図１に示す如く、
エンジン２を始動して制御がスタートすると（１０
０）、水温センサ８０の検出する実水温ＴＨＷを読み込
み（１０２）、始動時の実水温ＴＨＷが補正禁止始動時
温度Ｔ１以上であるか否かを判断する（１０４）。As shown in FIG. 1, the air-fuel ratio control device 90
When the control is started by starting the engine 2 (10
0), the actual water temperature THW detected by the water temperature sensor 80 is read (102), and it is determined whether or not the actual water temperature THW at the time of starting is equal to or higher than the correction inhibition starting temperature T1 (104).

【００３２】始動時の実水温ＴＨＷが比較的高く（ＴＨ
Ｗ≧Ｔ１）、判断（１０４）がＹＥＳの場合は、エンジ
ン２を停止した後にそれほど時間が経過していない再始
動（暖機再始動）であり、エンジン本体温度が十分に高
いため、実水温ＴＨＷを補正水温ＴＨＥ（ＴＨＥ＝ＴＨ
Ｗ）とし（１０６）、エンドにする（１０８）。The actual water temperature THW at the start is relatively high (THW
W ≧ T1), and if the determination (104) is YES, the engine 2 has been stopped and the engine has not restarted for a long time (warm-up restart), and the engine body temperature is sufficiently high. THW is corrected water temperature THE (THE = TH
W) (106) and end (108).

【００３３】始動時の実水温ＴＨＷが低く（ＴＨＷ＜Ｔ
１）、判断（１０４）がＮＯの場合は、実水温ＴＨＷが
補正開始水温である完全暖機近傍温度Ｔ２未満であるか
否かを判断する（１１０）。The actual water temperature THW at the time of starting is low (THW <T
1) When the determination (104) is NO, it is determined whether the actual water temperature THW is lower than the temperature T2 near the complete warm-up, which is the correction start water temperature (110).

【００３４】実水温ＴＨＷが完全暖機近傍温度Ｔ２未満
（ＴＨＷ＜Ｔ２）で、判断（２１０）がＹＥＳの場合
は、エンジン２を停止した後に長い時間が経過してから
の再始動（冷機再始動）であり、実水温ＴＨＷとエンジ
ン本体温度との差が小さく、要求される補正量のずれが
少ないので、実水温ＴＨＷを補正水温ＴＨＥ（ＴＨＥ＝
ＴＨＷ）とし（１０６）、エンドにする（１０８）。If the actual water temperature THW is less than the temperature T2 near the complete warm-up (THW <T2) and the determination (210) is YES, the engine 2 is stopped and restarted after a long time has passed (the cold Since the difference between the actual water temperature THW and the engine body temperature is small and the required correction amount is small, the actual water temperature THW is reduced to the corrected water temperature THE (THE =
THW) (106) and end (108).

【００３５】実水温ＴＨＷが完全暖機近傍温度Ｔ２以上
（ＴＨＷ≧Ｔ２）で、判断（１１０）がＮＯの場合は、
補正水温ＴＨＥが実水温ＴＨＷ以上であるか否かをを判
断する（１１２）。If the actual water temperature THW is equal to or higher than the temperature T2 near the complete warm-up (THW ≧ T2) and the determination (110) is NO,
It is determined whether or not the corrected water temperature THE is equal to or higher than the actual water temperature THW (112).

【００３６】補正水温ＴＨＥが実水温ＴＨＷ以上（ＴＨ
Ｅ≧ＴＨＷ）で、判断（１１２）がＹＥＳの場合は、実
水温ＴＨＷが完全暖機到達温度Ｔ３に達してからある時
間が経過して、補正水温ＴＨＥと実水温ＴＨＷとの差が
無くなっているため、実水温ＴＨＷを補正水温ＴＨＥ
（ＴＨＥ＝ＴＨＷ）とし（１０６）、エンドにする（１
０８）。When the corrected water temperature THE is equal to or higher than the actual water temperature THW (TH
If E ≧ THW) and the determination (112) is YES, a certain time has elapsed since the actual water temperature THW reached the complete warm-up reaching temperature T3, and the difference between the corrected water temperature THE and the actual water temperature THW disappears. Therefore, the actual water temperature THW is corrected to the corrected water temperature THE.
(THE = THW) (106) and end (1
08).

【００３７】補正水温ＴＨＥが実水温ＴＨＷ未満（ＴＨ
Ｅ＜ＴＨＷ）で、判断（１１２）がＮＯの場合は、実水
温ＴＨＷと補正水温ＴＨＥとに差があるため、補正水温
ＴＨＥの温度上昇率に制限値ΔＴによる制限を加え（Ｔ
ＨＥ＝ＴＨＥ＋ΔＴ）て補正水温ＴＨＥを求め（１１
４）、エンドにする（１０８）。The corrected water temperature THE is less than the actual water temperature THW (TH
If E <THW) and the determination (112) is NO, there is a difference between the actual water temperature THW and the corrected water temperature THE, so that the temperature increase rate of the corrected water temperature THE is limited by the limit value ΔT (T
HE = THE + ΔT) to obtain a corrected water temperature THE (11).
4), end (108).

【００３８】求められた補正水温ＴＨＥは、エンジン本
体温度に相当する温度である。エンジン２を補正禁止始
動時温度Ｔ１よりも低い温度から始動した場合には、水
温センサ８０の検出する実水温ＴＨＷが完全暖機到達温
度Ｔ３に達しても、エンジン本体温度が完全暖機到達温
度Ｔ３に達するまでに時間がかかる。このため、エンジ
ン２の熱容量に応じた制限値ΔＴによる制限を加えて、
エンジン本体温度にできるだけ近接するよう補正水温Ｔ
ＨＥを求める。The calculated corrected water temperature THE is a temperature corresponding to the engine body temperature. When the engine 2 is started from a temperature lower than the correction inhibition start temperature T1, even if the actual water temperature THW detected by the water temperature sensor 80 reaches the complete warm-up reaching temperature T3, the engine body temperature becomes the complete warm-up reaching temperature. It takes time to reach T3. For this reason, the restriction by the restriction value ΔT according to the heat capacity of the engine 2 is added,
Corrected water temperature T so as to be as close as possible to the engine body temperature
Ask for HE.

【００３９】空燃比制御装置９０は、制御手段９２によ
って、上記求められた実水温ＴＨＷ及び補正水温ＴＨＥ
により実水温用補正量及び補正水温用補正量を決定し、
実水温用補正量及び補正水温用補正量により燃料噴射弁
の噴射する燃料噴射量を増量補正し、エンジンの空燃比
が目標空燃比になるよう制御する。The air-fuel ratio control device 90 is controlled by the control means 92 to obtain the actual water temperature THW and the corrected water temperature THE obtained above.
To determine the correction amount for the actual water temperature and the correction amount for the correction water temperature,
The fuel injection amount injected by the fuel injection valve is increased and corrected based on the actual water temperature correction amount and the corrected water temperature correction amount, and control is performed so that the air-fuel ratio of the engine becomes the target air-fuel ratio.

【００４０】このように、空燃比制御装置９０は、実水
温ＴＨＷが完全暖機近傍温度Ｔ２から完全暖機到達温度
Ｔ３までの間に存する場合は、実水温ＴＨＷに基づく補
正水温ＴＨＥに応じて設定された補正水温用補正量によ
り燃料噴射弁５２の噴射する燃料噴射量を増量補正する
ことにより、水温センサ８０の検出する実水温ＴＨＷが
完全暖機到達温度Ｔ３になっても直ちに完全暖機状態で
の補正量による増量補正に移行することがなく、補正量
の不足による不具合を回避することができる。As described above, when the actual water temperature THW is between the temperature T2 near the complete warm-up and the temperature T3 reaching the complete warm-up, the air-fuel ratio control device 90 responds to the correction water temperature THE based on the actual water temperature THW. By increasing and correcting the fuel injection amount injected by the fuel injection valve 52 with the set correction amount for the water temperature, even if the actual water temperature THW detected by the water temperature sensor 80 reaches the complete warm-up reaching temperature T3, it is completely warmed up immediately. It is possible to avoid a problem due to a shortage of the correction amount without shifting to the increase correction by the correction amount in the state.

【００４１】これにより、空燃比制御装置９０は、エン
ジン２が冷機状態から完全暖機状態になった際の水温セ
ンサ８０が検出する実水温ＴＨＷとエンジン本体温度と
の差に起因する補正量のずれを補償することができ、エ
ンジン２の暖機進捗状況に応じて燃料噴射量を適切に補
正することができる。Thus, the air-fuel ratio controller 90 adjusts the correction amount due to the difference between the actual water temperature THW detected by the water temperature sensor 80 and the engine body temperature when the engine 2 changes from the cold state to the fully warmed-up state. The deviation can be compensated, and the fuel injection amount can be appropriately corrected according to the progress of warming up the engine 2.

【００４２】このため、このエンジン２の空燃比制御装
置９０は、エンジン２の暖機運転中に水温センサ８０が
検出する実水温とエンジン本体温度との差に起因する補
正量の不足を解消することができ、空燃比を適正化し得
て、エンジン２の暖機運転を安定にさせ得て、ドライバ
ビリティを向上することができる。For this reason, the air-fuel ratio control device 90 of the engine 2 eliminates the shortage of the correction amount caused by the difference between the actual water temperature detected by the water temperature sensor 80 and the engine body temperature during the warm-up operation of the engine 2. Therefore, the air-fuel ratio can be optimized, the warm-up operation of the engine 2 can be stabilized, and the drivability can be improved.

【００４３】前記補正量不足による不具合は、エンジン
本体温度が完全暖機状態となっていないにもかかわら
ず、完全暖機状態の温度になっている実水温ＴＨＷによ
り設定される実水温用補正量マップを使用する結果であ
る。The problem caused by the insufficient correction amount is that the actual water temperature correction amount set by the actual water temperature THW at which the engine body temperature is in the fully warmed-up state even though the engine body temperature is not completely warmed up. The result of using a map.

【００４４】そこで、空燃比制御装置９０は、図３に示
す如く、実水温ＴＨＷに応じて予め設定された実水温用
補正量マップを設け、この実水温用補正量マップにおけ
る完全暖機到達温度Ｔ３（図３においては８０℃）に最
近接する実水温ＴＨＷを完全暖機近傍温度Ｔ２（図３に
おいては７０℃）として設定することにより、実水温Ｔ
ＨＷによる実水温補正量マップを使うと不具合を生じる
状態において、実水温ＴＨＷから求められる補正水温Ｔ
ＨＥを燃料噴射量の補正に使用して、的確な温度に応じ
た増量補正を実現することができる。Therefore, the air-fuel ratio control device 90 provides an actual water temperature correction amount map preset according to the actual water temperature THW, as shown in FIG. By setting the actual water temperature THW closest to T3 (80 ° C. in FIG. 3) as the temperature T2 near the complete warm-up (70 ° C. in FIG. 3), the actual water temperature T
In a state where the actual water temperature correction amount map based on the HW causes a problem, the corrected water temperature T obtained from the actual water temperature THW is used.
HE can be used for the correction of the fuel injection amount, so that the increase correction according to the accurate temperature can be realized.

【００４５】また、この空燃比制御装置９０は、温度上
昇率に制限値ΔＴによる制限を加えることにより補正水
温ＴＨＥを求めていることから、容易に水温補正が可能
となり、かつ燃料噴射量の増量補正を適切なものにする
ことができる。Since the air-fuel ratio controller 90 obtains the corrected water temperature THE by limiting the temperature rise rate by the limit value ΔT, the water temperature can be easily corrected and the fuel injection amount can be increased. Correction can be made appropriate.

【００４６】さらに、空燃比制御装置９０は、実水温Ｔ
ＨＷが補正禁止始動時温度Ｔ１以上からのエンジン２の
暖機運転時に実水温用補正量により燃料噴射弁５２の噴
射する燃料噴射量を増量補正することにより、エンジン
本体温度が十分に高い暖機再始動時に、補正水温ＴＨＥ
による増量補正を行わないことから、燃費を向上するこ
とができる。Further, the air-fuel ratio control device 90 calculates the actual water temperature T
In the warm-up operation of the engine 2 when the HW is higher than the correction inhibition starting temperature T1, the fuel injection amount injected by the fuel injection valve 52 is increased by the actual water temperature correction amount during the warm-up operation of the engine 2, so that the engine body temperature is sufficiently high. At restart, the corrected water temperature THE
The fuel consumption can be improved because the increase correction is not performed.

【００４７】なお、この発明は、上述実施例に限定され
ることなく、種々応用改変が可能である。例えば、上述
実施例においては、補正水温ＴＨＥを燃料噴射量の補正
に使用したが、電子式の点火時期制御装置による点火時
期の補正に補正水温ＴＨＥを使用することもでき、エン
ジン２の暖機運転中に水温センサ８０が検出する実水温
とエンジン本体温度との差に起因する補正量の不足を解
消して、点火時期を適正化し得て、エンジン２の暖機運
転を安定にさせ得て、ドライバビリティを向上すること
ができるものである。It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified. For example, in the above-described embodiment, the corrected coolant temperature THE is used for correcting the fuel injection amount. However, the corrected coolant temperature THE may be used for correcting the ignition timing by the electronic ignition timing control device, and the warm-up of the engine 2 may be performed. It is possible to eliminate the shortage of the correction amount caused by the difference between the actual water temperature detected by the water temperature sensor 80 and the engine body temperature during operation, optimize the ignition timing, and stabilize the warm-up operation of the engine 2. , Drivability can be improved.

【００４８】また、冷却水の温度を検出する水温センサ
８０は、燃焼室１２や吸気ポート１４等に近接するウォ
ータジャケットに臨ませて設け、あるいは、燃焼室１２
や吸気ポート１４等に近接するウォータジャケットにエ
ンジン本体温度に近似する温度の冷却水の溜まり部を設
け、この溜まり部に臨ませて設けることにより、エンジ
ン本体温度に近似する実水温ＴＨＷを検出することがで
き、燃料噴射量の増量補正を適切なものにすることがで
きる。さらに、温度上昇率の制限値ΔＴは、エンジン負
荷を考慮して設定することにより、暖機運転中のエンジ
ン負荷の変動に対応する補正水温ＴＨＥを求めることが
でき、燃料噴射量の増量補正を適切なものにすることが
できる。The water temperature sensor 80 for detecting the temperature of the cooling water is provided so as to face a water jacket adjacent to the combustion chamber 12, the intake port 14, or the like.
A cooling water reservoir having a temperature close to the engine body temperature is provided in a water jacket close to the air intake port 14 and the like, and is provided so as to face this pool portion, thereby detecting an actual water temperature THW close to the engine body temperature. Therefore, the increase correction of the fuel injection amount can be made appropriate. Further, by setting the limit value ΔT of the temperature rise rate in consideration of the engine load, the corrected coolant temperature THE corresponding to the fluctuation of the engine load during the warm-up operation can be obtained, and the increase correction of the fuel injection amount can be performed. Can be appropriate.

【００４９】[0049]

【発明の効果】このように、この発明のエンジンの空燃
比制御装置は、エンジンが冷機状態から完全暖機状態に
なる際の水温センサが検出する実水温とエンジン本体温
度との差に起因する補正量のずれを補償し得て、エンジ
ンの暖機進捗状況に応じて燃料噴射量を適切に補正する
ことができる。As described above, the air-fuel ratio control apparatus for an engine according to the present invention is based on the difference between the actual water temperature detected by the water temperature sensor and the engine body temperature when the engine changes from a cold state to a complete warm-up state. The deviation of the correction amount can be compensated, and the fuel injection amount can be appropriately corrected according to the progress of the warm-up of the engine.

【００５０】このため、このエンジンの空燃比制御装置
は、エンジンの暖機運転中に水温センサが検出する実水
温とエンジン本体温度との差に起因する補正量の不足を
解消し得て、空燃比を適正化し得て、エンジンの暖機運
転を安定にさせ得て、ドライバビリティを向上すること
ができる。Therefore, the air-fuel ratio control device for the engine can solve the shortage of the correction amount caused by the difference between the actual water temperature detected by the water temperature sensor during the warm-up operation of the engine and the temperature of the engine body. The fuel ratio can be optimized, the warm-up operation of the engine can be stabilized, and the drivability can be improved.

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

【図１】この発明の実施例を示すエンジンの空燃比制御
装置の水温補正制御のフローチャートである。FIG. 1 is a flowchart of water temperature correction control of an air-fuel ratio control device for an engine according to an embodiment of the present invention.

【図２】空燃比制御装置の水温補正制御のタイミングチ
ャートである。FIG. 2 is a timing chart of water temperature correction control of the air-fuel ratio control device.

【図３】実水温用補正量マップを示す図である。FIG. 3 is a diagram showing an actual water temperature correction amount map.

【図４】空燃比制御装置の概略構成図である。FIG. 4 is a schematic configuration diagram of an air-fuel ratio control device.

【符号の説明】[Explanation of symbols]

２ エンジン ４ シリンダブロック ６ シリンダヘッド ８ ヘッドカバー ３２ 吸気通路 ４２ 排気通路 ５２ 燃料噴射弁 ７８ クランク角センサ ８０ 水温センサ ８２ スロットルセンサ ８４ 吸気圧センサ ８６ Ｏ２センサ ８８ ノックセンサ ９０ 空燃比制御装置 ９２ 制御手段 2 Engine 4 Cylinder block 6 Cylinder head 8 Head cover 32 Intake passage 42 Exhaust passage 52 Fuel injection valve 78 Crank angle sensor 80 Water temperature sensor 82 Throttle sensor 84 Intake pressure sensor 86 O2 sensor 88 Knock sensor 90 Air-fuel ratio control device 92 Control means

フロントページの続き Ｆターム(参考） 3G084 BA09 BA13 CA02 DA02 DA05 DA12 EA11 EB08 FA20 FA25 FA29 FA33 FA38 3G301 HA14 JA02 JA13 KA04 KA05 LB02 MA01 MA11 NC02 ND01 NE01 NE17 PC08Z PD02A PD02Z PE01Z PE03Z PE08ZContinued on front page F term (reference) 3G084 BA09 BA13 CA02 DA02 DA05 DA12 EA11 EB08 FA20 FA25 FA29 FA33 FA38 3G301 HA14 JA02 JA13 KA04 KA05 LB02 MA01 MA11 NC02 ND01 NE01 NE17 PC08Z PD02A PD02Z PE01Z PE03Z PE08Z

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 エンジンに燃料を噴射する燃料噴射弁を
設け、前記エンジンの冷却水の実水温を検出する水温セ
ンサを設け、この水温センサの検出する実水温に応じて
設定された実水温用補正量により前記燃料噴射弁の噴射
する燃料噴射量を増量補正し、前記エンジンの空燃比が
目標空燃比になるよう制御するエンジンの空燃比制御装
置において、前記水温センサの検出する実水温が前記エ
ンジンの完全暖機状態近傍に到達した状態の完全暖機近
傍温度から前記完全暖機状態に到達した状態の完全暖機
到達温度までの間に存する場合は前記実水温に基づいて
補正水温を求め、この補正水温に応じて設定された補正
水温用補正量により前記燃料噴射弁の噴射する燃料噴射
量を増量補正し、前記エンジンの空燃比が目標空燃比に
なるよう制御する制御手段を設けたことを特徴とするエ
ンジンの空燃比制御装置。1. A fuel injection valve for injecting fuel into an engine, a water temperature sensor for detecting an actual water temperature of the engine cooling water, and an actual water temperature set according to the actual water temperature detected by the water temperature sensor. In the air-fuel ratio control device for the engine, which controls the air-fuel ratio of the engine to be a target air-fuel ratio by increasing and correcting the fuel injection amount injected by the fuel injection valve by the correction amount, the actual water temperature detected by the water temperature sensor is set to If the temperature is between the near-warm-up temperature in the state where the engine is near the fully warm-up state and the fully-warm-up reaching temperature in the state where the engine is in the fully warmed-up state, a corrected water temperature is determined based on the actual water temperature. The fuel injection amount injected by the fuel injection valve is increased and corrected by a correction water temperature correction amount set in accordance with the correction water temperature, and control is performed so that the air-fuel ratio of the engine becomes a target air-fuel ratio. An air-fuel ratio control device for an engine, comprising control means. 【請求項２】 前記制御手段は、前記実水温に応じて予
め設定された実水温用補正量マップを設け、この実水温
用補正量マップにおける完全暖機到達温度に最近接する
実水温を前記完全暖機近傍温度として設定したことを特
徴とする請求項１に記載のエンジンの空燃比制御装置。2. The actual water temperature correction amount map preset according to the actual water temperature is provided by the control means, and the actual water temperature closest to the complete warm-up reaching temperature in the actual water temperature correction amount map is determined by the complete water temperature correction amount map. The air-fuel ratio control device for an engine according to claim 1, wherein the temperature is set as a temperature near a warm-up. 【請求項３】 前記制御手段は、温度上昇率に制限値に
よる制限を加えることにより前記補正水温を求めること
を特徴とする請求項１に記載のエンジンの空燃比制御装
置。3. The air-fuel ratio control device for an engine according to claim 1, wherein the control means obtains the corrected water temperature by restricting a temperature rise rate by a restriction value. 【請求項４】 前記制御手段は、前記実水温が補正禁止
始動時温度未満からのエンジンの暖機運転時に、前記完
全暖機近傍温度から完全暖機到達温度までの間に補正水
温用補正量により前記燃料噴射弁の噴射する燃料噴射量
を増量補正することを特徴とする請求項１に記載のエン
ジンの空燃比制御装置。4. The controller according to claim 1, wherein the control means is configured to correct the correction amount for the corrected water temperature during the warm-up operation of the engine from a temperature at which the actual water temperature is lower than the correction-inhibited start temperature to a temperature at which the complete warm-up is attained. The air-fuel ratio control device for an engine according to claim 1, wherein the fuel injection amount injected by the fuel injection valve is increased and corrected by the following. 【請求項５】 前記制御手段は、前記実水温が補正禁止
始動時温度以上からのエンジンの暖機運転時に、前記実
水温用補正量により前記燃料噴射弁の噴射する燃料噴射
量を増量補正することを特徴とする請求項１に記載のエ
ンジンの空燃比制御装置。5. The control means increases and corrects the fuel injection amount injected by the fuel injection valve by the actual water temperature correction amount during a warm-up operation of the engine when the actual water temperature is equal to or higher than the correction inhibition starting temperature. The air-fuel ratio control device for an engine according to claim 1, wherein:
JP2000205388A 2000-07-06 2000-07-06 Air/fuel ratio control device of engine Pending JP2002021607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000205388A JP2002021607A (en) 2000-07-06 2000-07-06 Air/fuel ratio control device of engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000205388A JP2002021607A (en) 2000-07-06 2000-07-06 Air/fuel ratio control device of engine

Publications (1)

Publication Number Publication Date
JP2002021607A true JP2002021607A (en) 2002-01-23

Family

ID=18702481

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000205388A Pending JP2002021607A (en) 2000-07-06 2000-07-06 Air/fuel ratio control device of engine

Country Status (1)

Country Link
JP (1) JP2002021607A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009275613A (en) * 2008-05-15 2009-11-26 Denso Corp Control device of internal combustion engine
JP2012057535A (en) * 2010-09-08 2012-03-22 Honda Motor Co Ltd Control device of general purpose engine
JP2012057541A (en) * 2010-09-08 2012-03-22 Honda Motor Co Ltd Control device for general-purpose engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009275613A (en) * 2008-05-15 2009-11-26 Denso Corp Control device of internal combustion engine
JP2012057535A (en) * 2010-09-08 2012-03-22 Honda Motor Co Ltd Control device of general purpose engine
JP2012057541A (en) * 2010-09-08 2012-03-22 Honda Motor Co Ltd Control device for general-purpose engine
US8838361B2 (en) 2010-09-08 2014-09-16 Honda Motor Co., Ltd. Control apparatus for general-purpose engine

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