JPH04325743A - Deceleration control device for internal combustion engine - Google Patents

Abstract

PURPOSE:To maintain uniform engine speed even with the different state before decelerating operation by taking account of throttle opening and engine speed before the deceleration of an engine so as to control an idle speed control valve according to the changed state of the throttle opening and engine speed at the decelerating time. CONSTITUTION:During the operation of an internal combustion engine, signals from a throttle sensor 16 and an engine speed sensor 24 are inputted into a control means 22 so as to previously grasp the state before decelerating operation, that is, the considerably lowered state of engine speed, since the fluctuation of an air-fuel ratio at the decelerating time becomes larger as the state before decelerating operation is of higher load and lower rotation. On the basis of this result, an idle speed valve 20 in a by-pass air passage 18 provided to by-pass an intake throttle valve 12 in an intake passage 8 is operation-controlled at the decelerating time according to the change of deceleration information. That is, the control value of the idle speed valve 20 is controlled to be smaller as the state before the decelerating operation is of higher load and lower rotation so as to maintain uniform engine speed and thereby to improve the operating state and fuel consumption.

Description

【発明の詳細な説明】[Detailed description of the invention]

【０００１】0001

【産業上の利用分野】この発明は内燃機関の減速制御装
置に係り、特に減速運転時に減速運転前の運転状態が異
なっても機関回転数を一様に制御して運転性能及び燃費
を向上し得る内燃機関の減速制御装置に関する。[Field of Industrial Application] This invention relates to a deceleration control device for an internal combustion engine, and in particular, it improves driving performance and fuel efficiency by uniformly controlling the engine speed during deceleration operation even if the operating state before deceleration operation differs. The present invention relates to a deceleration control device for an internal combustion engine.

【０００２】0002

【従来の技術】車両の内燃機関にあっては、減速運転時
に機関回転数の変化状態を検出して燃料カットや復帰減
量補正を行い、空燃比を適正に制御する減速制御装置を
設けているものがある。[Prior Art] Vehicle internal combustion engines are equipped with a deceleration control device that detects changes in the engine speed during deceleration operation, performs fuel cut and restoration reduction correction, and appropriately controls the air-fuel ratio. There is something.

【０００３】このような減速制御装置としては、例えば
、特開昭６０−６５２４３号公報、実開平１−１５９１
４８号公報に開示されている。特開昭６０−６５２４３
号公報に記載のものは、スロットル弁がアイドル位置以
外の場合は、所定のサンプリング周期で各エンジン運転
状態に応じてソレノイド弁を調節制御し、急減速時スロ
ットル弁が直ちにアイドル位置に戻った場合にはソレノ
イド弁を所定の時間割合でゆっくり閉じさせることによ
り、高負荷運転巾にアクセルの踏込みを急激に解いた際
の混合気の過濃化を防止するものである。また、実開平
１−１５９１４８号公報に記載のものは、補助空気量制
御弁を最大開度に制御しても機関減速運転状態から要求
される補助空気量より実際の補助空気量が不足する減速
運転状態を判別する補助空気量不足状態判別手段と、補
助空気量不足状態判別手段により補助空気量が不足する
減速運転状態が判別されたときにアイドルアップ制御弁
を強制的に開制御する減速時アイドルアップ制御弁開制
手段とを設けたものである。As such a deceleration control device, for example, Japanese Patent Application Laid-Open No. 60-65243, Japanese Utility Model Application No. 1-1591
It is disclosed in Publication No. 48. Japanese Patent Publication No. 60-65243
What is described in the publication is that when the throttle valve is in a position other than the idle position, the solenoid valve is adjusted and controlled according to each engine operating condition at a predetermined sampling period, and when the throttle valve immediately returns to the idle position during sudden deceleration. By slowly closing the solenoid valve at a predetermined time rate, it is possible to prevent the mixture from becoming too rich when the accelerator is suddenly released during high-load operation. In addition, the method described in Japanese Utility Model Application Publication No. 1-159148 is a deceleration system in which the actual amount of auxiliary air is insufficient than the amount of auxiliary air required from the engine deceleration operating state even if the auxiliary air amount control valve is controlled to the maximum opening. An auxiliary air amount insufficient state determining means for determining the operating state, and an auxiliary air amount insufficient state determining means for determining a decelerating operating state in which the auxiliary air amount is insufficient, the idle up control valve is forcibly opened during deceleration. The idle up control valve opening control means is provided.

【０００４】また、内燃機関にあっては、アクセル開度
としてスロットル開度を検出し、減速運転時に、アイド
ルスイッチがオンになると、減速制御装置を作動させた
り、あるいは、機械式のダッシュポットによって吸気絞
り弁の閉動作を制御しているものがある。Furthermore, in an internal combustion engine, the throttle opening is detected as the accelerator opening, and when the idle switch is turned on during deceleration operation, the deceleration control device is activated or the mechanical dashpot is activated. There is one that controls the closing operation of the intake throttle valve.

【０００５】[0005]

【発明が解決しようとする課題】ところが、従来にあっ
ては、エンジンストール等の発生を防止するために、最
悪状態を考慮して減速制御が行われるので、図５に示す
如く、機関回転数の低下が少ない状態（図５の■、■で
示す）では、機関回転数の上昇が長く継続し、減速運転
以外においては機関回転数の上昇や車両の飛出し等の不
都合が生じていた。また、スロットル開度を検出して減
速制御装置を作動させたり、ダッシュポットによって吸
気絞り弁を閉動作の制御をする場合も、同様な不都合が
あった。[Problems to be Solved by the Invention] Conventionally, however, in order to prevent the occurrence of engine stalls, etc., deceleration control is performed in consideration of the worst-case situation, so as shown in FIG. In a state where the decrease in the engine speed is small (indicated by ■ and ■ in FIG. 5), the engine speed continues to rise for a long time, and problems such as an increase in the engine speed and the vehicle jumping out occur in situations other than deceleration operation. Further, similar problems occur when the throttle opening is detected to operate the deceleration control device or when the dashpot is used to control the closing operation of the intake throttle valve.

【０００６】また、機関回転数を検出して減速制御する
構成にあっては、機関回転数が上昇しない程度の急激な
アクセルスイッチのオン・オフによってエンジンストー
ル等が発生するという不都合があった。[0006]Furthermore, in a configuration in which deceleration control is performed by detecting the engine speed, there is a problem in that engine stalling occurs when the accelerator switch is suddenly turned on and off to the extent that the engine speed does not increase.

【０００７】[0007]

【課題を解決するための手段】そこで、この発明は、上
述の不都合を除去するために、吸気絞り弁を迂回するバ
イパスエア通路を設け、このバイパスエア通路を開閉し
て内燃機関へのバイパス空気量を制御する電磁弁を設け
、前記吸気絞り弁のスロットル開度を検出するスロット
ルセンサを設け、前記内燃機関の機関回転数を検出する
回転数センサを設け、前記内燃機関の減速運転前のスロ
ットル開度及び機関回転数を考慮して前記内燃機関の減
速運転時には前記スロットル開度及び機関回転数の変化
状態に応じて前記電磁弁を作動して機関回転数を制御さ
せる制御手段を設けたことを特徴とする。[Means for Solving the Problems] Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a bypass air passage that bypasses the intake throttle valve, and opens and closes this bypass air passage to supply bypass air to the internal combustion engine. a throttle sensor for detecting a throttle opening of the intake throttle valve; a rotation speed sensor for detecting the engine rotation speed of the internal combustion engine; Control means is provided for controlling the engine speed by operating the electromagnetic valve in accordance with changes in the throttle opening and engine speed during deceleration operation of the internal combustion engine in consideration of the opening and engine speed. It is characterized by

【０００８】[0008]

【作用】この発明の構成によれば、制御手段は、内燃機
関の減速運転前のスロットル開度及び機関回転数を考慮
し、内燃機関の減速運転時には、スロットル開度及び機
関回転数の変化状態、つまり減速状態に応じて電磁弁を
作動制御する。これにより、バイパス通路からのバイパ
ス空気量が制御されて、機関回転数が一様に維持され、
運転状態及び燃費を向上させることができる。[Operation] According to the structure of the present invention, the control means takes into consideration the throttle opening degree and engine speed before decelerating operation of the internal combustion engine, and when the internal combustion engine is decelerating, the control means takes into account the changing state of the throttle opening degree and engine speed. In other words, the solenoid valve is operated and controlled according to the deceleration state. As a result, the amount of bypass air from the bypass passage is controlled, and the engine speed is maintained uniformly.
Driving conditions and fuel efficiency can be improved.

【０００９】[0009]

【実施例】以下図面に基づいてこの発明の実施例を詳細
且つ具体的に説明する。図１〜図４は、この発明の実施
例を示すものである。図１において、２は車両の内燃機
関、４は減速制御装置、６は吸気マニホルド、８は吸気
通路、１０は燃料噴射弁である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail and specifically below with reference to the drawings. 1 to 4 show embodiments of this invention. In FIG. 1, 2 is an internal combustion engine of a vehicle, 4 is a deceleration control device, 6 is an intake manifold, 8 is an intake passage, and 10 is a fuel injection valve.

【００１０】前記吸気通路８内にあっては、燃料噴射弁
１０の下流側に吸気絞り弁１２が配設されている。この
吸気絞り弁１２は、絞り弁軸１４に固定され、吸気通路
８を開閉すべく回動される。また、吸気絞り弁１２の開
閉状態、つまりスロットル開度（アクセル開度）を検出
するスロットルセンサ１６が設けられている。In the intake passage 8, an intake throttle valve 12 is disposed downstream of the fuel injection valve 10. This intake throttle valve 12 is fixed to a throttle valve shaft 14 and rotated to open and close the intake passage 8. Further, a throttle sensor 16 is provided that detects the open/closed state of the intake throttle valve 12, that is, the throttle opening (accelerator opening).

【００１１】また、吸気絞り弁１２を迂回すべく、吸気
絞り弁１２の上流側の吸気通路８と下流側の吸気通路８
とを連通するバイパスエア通路１８が設けられている。 このバイパスエア通路１８には、電磁弁としてアイドル
スピード制御弁２０が介設されている。Furthermore, in order to bypass the intake throttle valve 12, the intake passage 8 on the upstream side and the intake passage 8 on the downstream side of the intake throttle valve 12 are connected to each other.
A bypass air passage 18 is provided that communicates with the. An idle speed control valve 20 is provided in the bypass air passage 18 as a solenoid valve.

【００１２】前記スロットルセンサ１６とアイドルスピ
ード制御弁２０とは、制御手段２２に連絡されている。 また、この制御手段２２には、機関回転数を検出する回
転数センサ２４が連絡されている。The throttle sensor 16 and the idle speed control valve 20 are connected to a control means 22. Further, this control means 22 is connected to a rotation speed sensor 24 that detects the engine rotation speed.

【００１３】前記制御手段２２は、スロットルセンサ１
６と回転数センサ２４とからの信号を入力し、内燃機関
２の減速運転前のスロットル開度及び機関回転数を考慮
、つまり把握し、減速運転時にはスロットル開度及び機
関回転数の変化状態、つまり減速状態の変化に応じてア
イドルスピード制御弁２０を作動制御し、バイパスエア
通路１８からのバイパス空気量を制御し、機関回転数を
制御させるものである。The control means 22 includes a throttle sensor 1
6 and the rotational speed sensor 24, the throttle opening and engine rotational speed of the internal combustion engine 2 before deceleration operation are considered, that is, grasped, and the changing state of the throttle opening and engine rotational speed during deceleration operation, In other words, the operation of the idle speed control valve 20 is controlled according to changes in the deceleration state, the amount of bypass air from the bypass air passage 18 is controlled, and the engine speed is controlled.

【００１４】次に、この実施例の作用を説明する。Next, the operation of this embodiment will be explained.

【００１５】内燃機関２が稼働することにより、制御手
段２２は、スロットルセンサ１６からスロットル開度と
回転数センサ２４から機関回転数とを入力し、減速運転
前のスロットル開度及び機関回転数を把握している。即
ち、図４に示す如く、減速運転前の状況として、制御手
段２２が例えば■、■、■の状況を感知している。この
図４にあっては、減速運転前の状況が、高負荷・低回転
であるほど、減速時の空燃比の変動が大きく、機関回転
数が大きく低下している。When the internal combustion engine 2 starts operating, the control means 22 inputs the throttle opening from the throttle sensor 16 and the engine speed from the rotational speed sensor 24, and determines the throttle opening and engine speed before deceleration operation. I understand. That is, as shown in FIG. 4, the control means 22 senses, for example, the situations ■, ■, and ■ as the conditions before the deceleration operation. In FIG. 4, the higher the load and lower the rotation speed before the deceleration operation, the larger the fluctuation in the air-fuel ratio during deceleration, and the larger the engine rotation speed decreases.

【００１６】そして、内燃機関２の減速運転時には、図
４の■の場合には、制御手段２２がアイドルスピード制
御弁２０の制御量を大に行い、また、図４の■の場合に
は、制御手段２２がアイドルスピード制御弁２０の制御
量を中に行い、さらに、図４の■の場合には、制御手段
２２がアイドルスピード制御弁２０の制御量を小に行う
。During deceleration operation of the internal combustion engine 2, the control means 22 greatly increases the control amount of the idle speed control valve 20 in the case (2) in FIG. 4, and in the case (2) in FIG. The control means 22 controls the amount of control of the idle speed control valve 20 to a medium value, and furthermore, in the case of (2) in FIG. 4, the control means 22 controls the amount of control of the idle speed control valve 20 to a small value.

【００１７】この結果、図３に示す如く、減速運転時に
あっては、減速運転前の状態、つまりスロットル開度及
び機関回転数が異なっても、機関回転数を一様に維持さ
せることができ、運転性能及び燃費を向上させることが
できる。As a result, as shown in FIG. 3, during deceleration operation, the engine speed can be maintained uniformly even if the state before deceleration operation, that is, the throttle opening and engine speed are different. , driving performance and fuel efficiency can be improved.

【００１８】[0018]

【発明の効果】以上詳細な説明から明らかなようにこの
発明によれば、内燃機関の減速運転前のスロットル開度
及び機関回転数を考慮して内燃機関の減速運転時にはス
ロットル開度及び機関回転数の変化状態に応じて電磁弁
を作動する制御手段を設けたことにより、バイパスエア
通路からのバイパス空気量を制御させ、減速運転前の状
況が異なっても機関回転数を一様に維持させて、運転状
態及び燃費を向上させ得る。Effects of the Invention As is clear from the above detailed description, according to the present invention, the throttle opening and engine rotation speed are adjusted during deceleration operation of the internal combustion engine, taking into consideration the throttle opening degree and engine rotation speed before deceleration operation of the internal combustion engine. By providing a control means that operates a solenoid valve according to the state of change in the number of engine speeds, the amount of bypass air from the bypass air passage can be controlled, and the engine speed can be maintained uniformly even if the conditions before deceleration operation are different. As a result, driving conditions and fuel efficiency can be improved.

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

【図１】減速制御装置のシステム構成図である。FIG. 1 is a system configuration diagram of a deceleration control device.

【図２】アイドルスピードコントロールの説明図である
。FIG. 2 is an explanatory diagram of idle speed control.

【図３】機関回転数の制御状態を示す説明図である。FIG. 3 is an explanatory diagram showing a control state of engine speed.

【図４】減速運転前と制御量とを示す説明図である。FIG. 4 is an explanatory diagram showing the control amount before deceleration operation.

【図５】従来における機関回転数の変化を示す説明図で
ある。FIG. 5 is an explanatory diagram showing changes in engine speed in the conventional engine.

【符号の説明】[Explanation of symbols]

２　　内燃機関 ４　　減速制御装置 １０　　燃料噴射弁 １２　　吸気絞り弁 １８　　バイパスエア通路 ２０　　アイドルスピード制御弁 ２２　　制御手段 ２４　　回転数センサ 2 Internal combustion engine 4 Deceleration control device 10 Fuel injection valve 12 Intake throttle valve 18 Bypass air passage 20 Idle speed control valve 22 Control means 24 Rotation speed sensor

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】　　吸気絞り弁を迂回するバイパスエア通
路を設け、このバイパスエア通路を開閉して内燃機関へ
のバイパス空気量を制御する電磁弁を設け、前記吸気絞
り弁のスロットル開度を検出するスロットルセンサを設
け、前記内燃機関の機関回転数を検出する回転数センサ
を設け、前記内燃機関の減速運転前のスロットル開度及
び機関回転数を考慮して前記内燃機関の減速運転時には
前記スロットル開度及び機関回転数の変化状態に応じて
前記電磁弁を作動して機関回転数を制御させる制御手段
を設けたことを特徴とする内燃機関の減速制御装置。1. A bypass air passage that bypasses an intake throttle valve is provided, an electromagnetic valve is provided that opens and closes the bypass air passage to control the amount of bypass air to the internal combustion engine, and the throttle opening of the intake throttle valve is detected. A rotation speed sensor is provided for detecting the engine rotation speed of the internal combustion engine, and a rotation speed sensor is provided for detecting the engine rotation speed of the internal combustion engine, and the throttle sensor is configured to adjust the throttle angle during deceleration operation of the internal combustion engine in consideration of the throttle opening degree and engine rotation speed before deceleration operation of the internal combustion engine. 1. A deceleration control device for an internal combustion engine, comprising a control means for controlling the engine speed by operating the electromagnetic valve according to changes in the opening degree and the engine speed.