JP2004124908A - Idle stop device for internal combustion engine - Google Patents

Idle stop device for internal combustion engine Download PDF

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Publication number
JP2004124908A
JP2004124908A JP2002293521A JP2002293521A JP2004124908A JP 2004124908 A JP2004124908 A JP 2004124908A JP 2002293521 A JP2002293521 A JP 2002293521A JP 2002293521 A JP2002293521 A JP 2002293521A JP 2004124908 A JP2004124908 A JP 2004124908A
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Prior art keywords
internal combustion
combustion engine
idle stop
compressor
air conditioner
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JP2002293521A
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JP4120345B2 (en
Inventor
Kazuteru Kurose
黒瀬　一輝
Atsushi Hikuma
日隈　淳
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an idle stop device for an internal combustion engine, prevented from adding uncomfortable vibrations to a vehicular driver and other occupants in idle stopping of the internal combustion engine. <P>SOLUTION: When idle stop conditions are established, a load of the internal combustion engine is reduced by disconnecting a compressor connected to the internal combustion engine and the internal combustion engine, and then fuel cutting is carried out to automatically stop the internal combustion engine. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】本発明は、内燃機関のアイドルストップ装置に関する。
【０００２】
【従来の技術】最近、渋滞時等のエンジンのアイドリング時において、所定のエンジン停止条件を満たした場合にエンジンを自動停止させることによって、排出ガスの低減や燃費を向上させる事を目的としたアイドルストップ車の開発がなされている。（特許文献１参照）
【特許文献１】
特開２００１−３３６４３４号公報（第３頁、図１）
【０００３】
【発明が解決しようとする課題】上記のようなアイドルストップ車において、エンジンのアイドリング時に所定のエンジン停止条件が成立して燃料カットを行いエンジンを停止させる場合に、エアコンコンプレッサが作動していると、エアコンコンプレッサの負荷によって急激にエンジンの回転が低下するため、エンジン停止時に不快な振動が発生することがある。特に、燃料カット中にエアコンの制御によってエアコンコンプレッサが切れるような事態が発生すると、コンプレッサの負荷が切れる前後で車両に大きな角加速度変化が生じ、運転車や同乗者に非常に不快な振動として伝わる。
【０００４】本発明の目的は、エンジンのアイドル停止時に運転者や同乗者に不快な振動を与えることのない内燃機関のアイドルストップ装置を提供することにある。
【課題を解決するための手段およびその作用】
【０００５】上記目的を達成するために、請求項１に記載の発明は、内燃機関により駆動されるコンプレッサと、前記コンプレッサを前記内燃機関から切り離すコンプレッサ切離手段と、前記内燃機関への燃料供給を遮断する燃料カット手段とを備え、前記内燃機関のアイドル時に所定の自動停止条件が成立した場合、前記コンプレッサ切離手段を作動させてから前記燃料カット手段を作動させて前記内燃機関を自動停止させるようにしたものである。これにより、内燃機関のアイドル時に所定の自動停止条件が成立した時にはコンプレッサが切り離されてから燃料カットが行われることになり、予め内燃機関の負荷が軽減されるので、燃料カット中にエンジン回転が急低下したり、コンプレッサ負荷が切れたりすることに起因する振動の発生を未然に防ぐことができ、運転者や同乗者に不快な振動を与えることのないアイドルストップが可能となる。
【０００６】
【発明の実施の形態】以下、図１及び図２を用いて、本発明の実施の形態による内燃機関のアイドルストップ装置の構成について説明する。図１は本発明の実施の形態による内燃機関のアイドルストップ装置のシステム構成図である。図２は本発明の実施の形態による内燃機関のアイドルストップ装置の制御内容のフローチャートである。
【０００７】図１に示すように、内燃機関１の出力軸には自動変速機２が連結され、内燃機関１の出力を自動変速機２を介して駆動輪３に伝達することで車両の走行を可能とするよう構成されている。内燃機関１は制御手段をなすコントローラ４により制御される。具体的に説明すると、内燃機関１に燃料を噴射するインジェクタ８や、図示しない点火プラグへの通電を行う点火コイル１０等の作動がコントローラ４により制御される。また、内燃機関のクランク軸にはベルト６及び電磁クラッチ７を介してエアコンコンプレッサー５が接続されており、内燃機関１の駆動力がベルト６と電磁クラッチ７を介してエアコンコンプレッサー５に伝達されることによりエアコンコンプレッサー５が駆動される。
【０００８】電磁クラッチ７はコンプレッサ切離手段を構成するものであり、エアコン制御装置１４からの信号によりＯＮ，ＯＦＦが制御されるものとなっている。電磁クラッチ７のＯＮ，ＯＦＦは、エアコン制御装置１４に接続されたエアコンスイッチ９の操作状態と連動しており、エアコンスイッチ９がＯＮである場合は電磁クラッチ７が係合することで内燃機関１の駆動力を伝達してエアコンコンプレッサー５を駆動させ、エアコンスイッチ９がＯＦＦである場合は電磁クラッチ７が切れることで内燃機関１の駆動力をエアコンコンプレッサー５に伝達しないよう、エアコンコンプレッサー５の作動状態が制御される。このエアコン制御装置１４にはコントローラ４からの信号も入力されており、コントローラ４から電磁クラッチ７をＯＦＦさせることを要求する信号が入力されるとエアコン制御装置１４はエアコンスイッチ９の操作に優先して電磁クラッチをＯＦＦさせるよう構成されている。
【０００９】コントローラ４には、車速を検出する車速センサ１１、自動変速機２のセレクタレバーの操作位置を検出するインヒビタスイッチ１２、車両のブレーキペダルの操作状態を検出するブレーキスイッチ１３等、が接続されている。これらのセンサやスイッチから検出される情報に基づいてコントローラ４は、アイドル時の機関自動停止条件たるアイドルストップ条件の成立の有無を判定し、アイドルストップ条件が成立したと判定した場合は電磁クラッチ７をＯＦＦさせてから燃料カット制御を行う。
【００１０】アイドルストップ条件は、例えば車速センサ１１から検出された車速がゼロかつブレーキスイッチ１３がブレーキ操作を検出している場合とインヒビタスイッチ１２がニュートラルレンジ状態を検出している状態で、且つ車速センサ１１から検出される車速がゼロである場合とが設定されている。なお、このほかアイドルストップ条件としては、インヒビタスイッチ１２がニュートラルレンジ状態またはドライブレンジ状態を検出かつ車速センサ１１が車速ゼロを検出かつブレーキスイッチ１３が作動状態にある場合等、自動変速機２の状態、制動装置の状態、車速を適宜組み合わせて設定することができる。
【００１１】次に図２を用いてコントローラ４における内燃機関のアイドルストップ装置の制御内容について説明する。
まずステップ（以下Ｓと略す）１にて、内燃機関１をアイドルストップさせるアイドルストップ条件が成立しているか否かを判定する。アイドルストップ条件が不成立の場合はアイドルストップは行わない。一方、アイドルストップ条件が成立した場合はＳ２に進みエアコン制御装置１４から入力される信号に基づいてエアコンが作動状態であるか否かを判定する。
【００１２】Ｓ２において、エアコンが作動していないことが判定された場合、Ｓ５に進みインジェクタ８の燃料噴射作動を遮断する指令が出力されて燃料カットを行う。一方、エアコンスイッチ１３がＯＮでエアコンが作動していると判定された場合、エアコンコンプレッサー５と内燃機関１とを接続する電磁クラッチ７の接続を切る指令をエアコン制御装置１４に出力してＳ４に進み、所定時間が経過してからＳ５に進む。Ｓ５では、上記と同じく各気筒の燃料カットを行い、内燃機関１を停止させる。なお、Ｓ４における所定時間は燃料カット前に確実に電磁クラッチ７が切れるように電磁クラッチ７が実際にＯＦＦされるまでの遅れ時間を考慮して設定される。
【００１３】以上のように、内燃機関１のアイドルストップ条件が成立した場合、先ずエアコンコンプレッサー５を電磁クラッチ７により内燃機関１から切り離すことで、あらかじめ負荷を低減してから燃料カットを行うようにすることにより、燃料カット中にエンジン回転が急低下したり、エアコンコンプレッサー５の負荷が切れたりすることに起因する振動の発生を未然に防ぐことができ、運転者や同乗者に不快な振動を与えることのない安定したアイドルストップによる振動の低減が可能である。なお、本発明は上記実施形態に何ら限定されるものではなく、図２のフローチャート図におけるＳ４の処理を省略しても良いし、ハイブリッド車用のアイドルストップ装置に適用しても良く、この他種々の変形実施が可能であることは言うまでもない。
【００１４】
【発明の効果】請求項１の発明によれば、内燃機関のアイドルストップ条件が成立した場合、内燃機関に接続するコンプレッサーが作動していても、コンプレッサーと内燃機関とを切り離してからアイドルストップを行うため、コンプレッサーの影響による不快な振動の発生を確実に防止することが可能となる。
【図面の簡単な説明】
【図１】本発明の実施の形態による内燃機関のアイドルストップ装置のシステム構成図である。
【図２】図２は本発明の実施の形態による内燃機関のアイドルストップ装置の制御内容のフローチャートである。
【符号の説明】
１　　　　　　内燃機関
２　　　　　　自動変速機
３　　　　　　駆動輪
４　　　　　　コントローラ
５　　　　　　エアコンコンプレッサー
６　　　　　　ベルト
７　　　　　　電磁クラッチ
８　　　　　　インジェクタ
９　　　　　　エアコンスイッチ
１０　　　　　　点火コイル
１１　　　　　　車速センサ
１２　　　　　　インヒビタスイッチ
１３　　　　　　ブレーキスイッチ
１４　　　　　　エアコン制御装置[0001]
The present invention relates to an idle stop device for an internal combustion engine.
[0002]
2. Description of the Related Art Recently, when idling an engine during a traffic jam or the like, the engine is automatically stopped when a predetermined engine stop condition is satisfied, thereby reducing exhaust gas and improving fuel efficiency. Stop cars are being developed. (See Patent Document 1)
[Patent Document 1]
JP 2001-336434 A (page 3, FIG. 1)
[0003]
In the idle stop vehicle as described above, when the engine is idling, a predetermined engine stop condition is satisfied and fuel cut is performed to stop the engine. In addition, since the rotation of the engine is rapidly reduced by the load of the air conditioner compressor, unpleasant vibration may occur when the engine is stopped. In particular, if the air conditioner compressor is cut off by the control of the air conditioner during fuel cut, a large angular acceleration change occurs in the vehicle before and after the compressor load is cut off, which is transmitted as extremely unpleasant vibration to the driving car and passengers .
An object of the present invention is to provide an idle stop device for an internal combustion engine which does not give unpleasant vibration to a driver or a passenger when the engine is stopped at idle.
Means for Solving the Problems and Their Functions
[0005] In order to achieve the above object, an invention according to claim 1 is a compressor driven by an internal combustion engine, a compressor disconnecting means for separating the compressor from the internal combustion engine, and a fuel supply to the internal combustion engine. Fuel cutoff means for shutting off the internal combustion engine, and when a predetermined automatic stop condition is satisfied when the internal combustion engine is idling, the compressor cutoff means is operated and then the fuel cutoff means is operated to automatically stop the internal combustion engine. It is intended to be. Accordingly, when a predetermined automatic stop condition is satisfied when the internal combustion engine is idling, the fuel is cut after the compressor is disconnected, and the load on the internal combustion engine is reduced in advance. It is possible to prevent the occurrence of vibrations caused by a sudden drop or a cut off of the compressor load, thereby enabling an idle stop without giving unpleasant vibrations to the driver or the passenger.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an idle stop device for an internal combustion engine according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a system configuration diagram of an idle stop device for an internal combustion engine according to an embodiment of the present invention. FIG. 2 is a flowchart of the control contents of the idle stop device for the internal combustion engine according to the embodiment of the present invention.
As shown in FIG. 1, an automatic transmission 2 is connected to an output shaft of the internal combustion engine 1, and the output of the internal combustion engine 1 is transmitted to drive wheels 3 via the automatic transmission 2 to drive the vehicle. It is configured to enable. The internal combustion engine 1 is controlled by a controller 4 serving as control means. More specifically, the operation of the injector 8 for injecting fuel into the internal combustion engine 1 and the operation of the ignition coil 10 for energizing an unillustrated ignition plug are controlled by the controller 4. An air conditioner compressor 5 is connected to the crankshaft of the internal combustion engine via a belt 6 and an electromagnetic clutch 7, and the driving force of the internal combustion engine 1 is transmitted to the air conditioner compressor 5 via the belt 6 and the electromagnetic clutch 7. Thus, the air conditioner compressor 5 is driven.
The electromagnetic clutch 7 constitutes a compressor disconnecting means, and its ON and OFF are controlled by a signal from the air conditioner control device 14. The ON / OFF of the electromagnetic clutch 7 is interlocked with the operation state of the air conditioner switch 9 connected to the air conditioner control device 14, and when the air conditioner switch 9 is ON, the electromagnetic clutch 7 is engaged and the internal combustion engine 1 is turned on. When the air conditioner switch 9 is OFF, the electromagnetic clutch 7 is disengaged so that the driving force of the internal combustion engine 1 is not transmitted to the air conditioner compressor 5 so that the air conditioner compressor 5 is operated. The state is controlled. A signal from the controller 4 is also input to the air conditioner control device 14, and when a signal requesting to turn off the electromagnetic clutch 7 is input from the controller 4, the air conditioner control device 14 has priority over the operation of the air conditioner switch 9. To turn off the electromagnetic clutch.
Connected to the controller 4 are a vehicle speed sensor 11 for detecting a vehicle speed, an inhibitor switch 12 for detecting an operation position of a selector lever of the automatic transmission 2, and a brake switch 13 for detecting an operation state of a brake pedal of the vehicle. Have been. Based on the information detected from these sensors and switches, the controller 4 determines whether or not an idle stop condition, which is an automatic engine stop condition at idling, is satisfied. Is turned off, then fuel cut control is performed.
The idle stop condition includes, for example, a case where the vehicle speed detected by the vehicle speed sensor 11 is zero and the brake switch 13 detects the brake operation, a case where the inhibitor switch 12 detects the neutral range state, and a case where the vehicle speed is detected. The case where the vehicle speed detected from the sensor 11 is zero is set. Other idle stop conditions include the state of the automatic transmission 2 such as when the inhibitor switch 12 detects a neutral range state or a drive range state, the vehicle speed sensor 11 detects a vehicle speed of zero, and the brake switch 13 is in an operating state. , The state of the braking device and the vehicle speed can be appropriately combined and set.
Next, the control contents of the idle stop device for the internal combustion engine in the controller 4 will be described with reference to FIG.
First, in step (hereinafter abbreviated as S) 1, it is determined whether an idle stop condition for idling stop of the internal combustion engine 1 is satisfied. If the idle stop condition is not satisfied, the idle stop is not performed. On the other hand, if the idle stop condition is satisfied, the process proceeds to S2, and it is determined whether or not the air conditioner is operating based on a signal input from the air conditioner control device 14.
In S2, if it is determined that the air conditioner is not operating, the program proceeds to S5, in which a command to cut off the fuel injection operation of the injector 8 is output and fuel cut is performed. On the other hand, when it is determined that the air conditioner switch 13 is ON and the air conditioner is operating, a command to disconnect the electromagnetic clutch 7 that connects the air conditioner compressor 5 and the internal combustion engine 1 is output to the air conditioner control device 14 and the process proceeds to S4. The process proceeds to S5 after a predetermined time has elapsed. In S5, the fuel cut of each cylinder is performed as described above, and the internal combustion engine 1 is stopped. Note that the predetermined time in S4 is set in consideration of a delay time until the electromagnetic clutch 7 is actually turned off so that the electromagnetic clutch 7 is surely disengaged before the fuel cut.
As described above, when the idle stop condition of the internal combustion engine 1 is satisfied, the air conditioner compressor 5 is first disconnected from the internal combustion engine 1 by the electromagnetic clutch 7 so that the load is reduced in advance and then the fuel cut is performed. By doing so, it is possible to prevent the occurrence of vibrations caused by a sudden decrease in the engine rotation during the fuel cut or the cutoff of the load on the air conditioner compressor 5, and to prevent unpleasant vibrations for the driver and passengers. Vibration can be reduced by stable idle stop without giving. It should be noted that the present invention is not limited to the above-described embodiment at all, and the process of S4 in the flowchart of FIG. 2 may be omitted, or may be applied to an idle stop device for a hybrid vehicle. It goes without saying that various modifications are possible.
[0014]
According to the first aspect of the present invention, when the idle stop condition of the internal combustion engine is satisfied, the idle stop is performed after the compressor and the internal combustion engine are disconnected even if the compressor connected to the internal combustion engine is operating. Therefore, it is possible to reliably prevent the generation of unpleasant vibration due to the influence of the compressor.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of an idle stop device for an internal combustion engine according to an embodiment of the present invention.
FIG. 2 is a flowchart of control contents of an idle stop device for an internal combustion engine according to the embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 internal combustion engine 2 automatic transmission 3 drive wheel 4 controller 5 air conditioner compressor 6 belt 7 electromagnetic clutch 8 injector 9 air conditioner switch 10 ignition coil 11 vehicle speed sensor 12 inhibitor switch 13 brake switch 14 air conditioner controller

Claims (1)

内燃機関により駆動されるコンプレッサと、
前記コンプレッサを前記内燃機関から切り離すコンプレッサ切離手段と、
前記内燃機関への燃料供給を遮断する燃料カット手段とを備え、
前記内燃機関のアイドル時に所定の自動停止条件が成立した場合、
前記コンプレッサの切離手段を作動させてから前記燃料カット手段を作動させて前記内燃機関を自動停止させる制御手段とを備えたことを特徴とした内燃機関のアイドルストップ装置A compressor driven by an internal combustion engine;
Compressor disconnecting means for disconnecting the compressor from the internal combustion engine,
Fuel cut-off means for cutting off fuel supply to the internal combustion engine,
When a predetermined automatic stop condition is satisfied at the time of idling of the internal combustion engine,
A control means for automatically stopping the internal combustion engine by operating the fuel cutoff means after operating the disconnecting means of the compressor.
JP2002293521A 2002-10-07 2002-10-07 Idle stop device for internal combustion engine Expired - Lifetime JP4120345B2 (en)

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Application Number Priority Date Filing Date Title
JP2002293521A JP4120345B2 (en) 2002-10-07 2002-10-07 Idle stop device for internal combustion engine

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Publication Number Publication Date
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JP4120345B2 JP4120345B2 (en) 2008-07-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7458353B2 (en) 2006-02-28 2008-12-02 Toyota Jidosha Kabushiki Kaisha Automatic internal combustion engine stop device, internal combustion engine provided with the same and automatic internal combustion engine stop method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7458353B2 (en) 2006-02-28 2008-12-02 Toyota Jidosha Kabushiki Kaisha Automatic internal combustion engine stop device, internal combustion engine provided with the same and automatic internal combustion engine stop method

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