JP3622868B2 - Exhaust brake operation control device - Google Patents

Exhaust brake operation control device Download PDF

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Publication number
JP3622868B2
JP3622868B2 JP14312595A JP14312595A JP3622868B2 JP 3622868 B2 JP3622868 B2 JP 3622868B2 JP 14312595 A JP14312595 A JP 14312595A JP 14312595 A JP14312595 A JP 14312595A JP 3622868 B2 JP3622868 B2 JP 3622868B2
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Japan
Prior art keywords
exhaust brake
speed
water temperature
engine speed
engine
Prior art date
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Expired - Lifetime
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JP14312595A
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Japanese (ja)
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JPH08338268A (en
Inventor
航 荒木
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UD Trucks Corp
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UD Trucks Corp
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Filing date
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Priority to JP14312595A priority Critical patent/JP3622868B2/en
Publication of JPH08338268A publication Critical patent/JPH08338268A/en
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  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は、水温センサと回転センサとアイドル回転数調整手段を有し、それらの水温センサと回転センサとアイドル回転数調整手段とからの信号により排気ブレーキ装置を作動させる制御ユニットを有する排気ブレーキ作動制御装置に関する。
【０００２】
【従来の技術】
従来技術として、図８の排気ブレーキ制御のブロックダイアグラムに示すように、アイドリング時に排気ブレーキの作動によるエンジン停止及び、スモークの発生を防止する目的で、エンジン回転数（ＮＥ ）を常時回転センサによって検出しており、予め設けておいた排気ブレーキ作動回転数（ＮＯＮ：固定値）、排気ブレーキ非作動回転数（ＮＯＦＦ 固定値）に対して、排気ブレーキ制御ユニットがエンジン回転数ＮＥ がＮＯＦＦ 以下になったと判断した場合に排気ブレーキ装置に作動信号を送り排気ブレーキを解除させる技術がある。
【０００３】
【発明が解決しようとする課題】
しかしながら、前述の技術は水温検出手段またはアイドル回転数調整手段を有し、その水温検出手段又は、アイドル回転数調整手段の信号によりアイドル回転数を可変とすることが可能な燃料噴射システム付エンジンの場合には、上記機能即ち、アイドル回転数を可変とする機能により図９で示すように、アイドル回転数（ＮＩ ）が前述の設定回転数（ＮＯＦＦ ）以上のアイドル回転数（ＮＩ ’）に上昇した場合、排気ブレーキが解除されなくなりエンジン停止及び、スモーク発生の防止が不可能となる。
【０００４】
そこで本発明の排気ブレーキ作動制御装置では、水温又は、アイドル回転数調整手段でアイドル回転数が変化したときに、排気ブレーキ解除の回転数も合わせて変化するようにし、アイドリング時はアイドル回転数が変化しても排気ブレーキが解除されるように制御することを目的とする。
【０００５】
【課題を解決するための手段】
本発明の排気ブレーキ作動制御装置は、水温センサと回転センサとアイドル回転数調整手段を有し、それらの水温センサと回転センサとアイドル回転数調整手段とからの信号により排気ブレーキ装置を作動させる制御ユニットを有する排気ブレーキ作動制御装置において、制御ユニットは水温センサとアイドル回転数調整手段とからの出力により排気ブレーキの解除回転数とこの排気ブレーキの解除回転数よりも大である排気ブレーキの作動回転数とを決定し、エンジンの回転数が排気ブレーキの作動回転数よりも大の場合には排気ブレーキを作動させ、エンジンの回転数が排気ブレーキの解除回転数と等しいかそれよりも小の場合は排気ブレーキの作動を停止させ、エンジンの回転数が排気ブレーキの作動回転数より小で解除回転数より大のときは前回の排気ブレーキ状態を維持する機能を有している。
【０００６】
【作用】
本発明によれば、水温又は、アイドル回転数調整手段の信号が変化して、エンジンのアイドリング回転数が変化しても、常にアイドル回転数よりも排気ブレーキ解除設定回転数の方が大で、且つ排気ブレーキ作動設定回転数は排気ブレーキ解除設定回転数よりも大であるので、アイドリング時には必ず排気ブレーキは解除となる。
【０００７】
【実施例】
以下、図１〜図７に基づいて本発明の実施例について説明する。
【０００８】
図１において、エンジン１５には冷却水の水温を検出するための水温センサ１と、機関回転数を検出するための回転センサ２と、例えば、燃料噴射量を調整することによりエンジン２のアイドル回転数を調整するアイドル回転数調整手段３と、排気管４に介装された排気ブレーキバルブ５と該排気ブレーキバルブ５を開閉させるアクチュエータ６と該アクチュエータ６を作動させる電磁弁７と該電磁弁７に圧縮空気を供給するエアタンク８とからなる排気ブレーキ装置９と、図２をも使用して、前記水温センサ１、アイドル回転数調整手段３からの水温、アイドル回転調整量の入力信号により適正な排気ブレーキ作動のエンジン回転数ＮＯＮと排気ブレーキ非作動のエンジン回転数ＮＯＦＦ を演算し、更に回転センサ２により検出した機関回転数ＮＥ と前記排気ブレーキ作動のエンジン回転数ＮＯＮと前記排気ブレーキ非作動のエンジン回転数ＮＯＦＦ とを比較することにより、排気ブレーキ作動か、現状制御状態の維持か、排気ブレーキ非作動かを判断し、排気ブレーキ装置９の電磁弁７に制御信号を送る排気ブレーキコントロールユニット１０から構成される。
【０００９】
尚、前述の或る時の水温ＷＴｎに対応する適正な排気ブレーキ作動のエンジン回転数ＮＯＮと排気ブレーキ非作動のエンジン回転数ＮＯＦＦ の関係をグラフとして示したものが図４であり、アイドル回転数Ｎｉ が変化しても排気ブレーキ非作動のエンジン回転数ＮＯＦＦ は常にアイドル回転数Ｎｉ を上回るために、図５、図６の排気ブレーキ作動パターンを示す図で明らかな様にどのようなアイドリング状態においても排気ブレーキを解除することが出来る。図５で示すように従来技術では排気ブレーキ作動のエンジン回転数ＮＯＮと排気ブレーキ非作動のエンジン回転数ＮＯＦＦ は固定であるため、アイドル回転数Ｎｉ が排気ブレーキ作動のエンジン回転数ＮＯＮを上回る場合は排気ブレーキが解除されないこととなる。
【００１０】
又、前述の或る時のアイドル回転調整量Ｖｉｎに対応する適正な排気ブレーキ作動のエンジン回転数ＮＯＮと排気ブレーキ非作動のエンジン回転数ＮＯＦＦ の関係をグラフとして示したものが図７であるが、この時の排気ブレーキ作動パターンは定性的には図５、図６と同様となる。
【００１１】
次に図３により制御フローを説明する。
【００１２】
先ずスタートして、ステップＳ１において水温センサ１により水温ＴＷ を、アイドル回転数調整手段３からアイドル回転数調整量ＶＩ を検出し、ステップＳ２に進み、排気ブレーキコントロールユニット１０によって前記水温ＴＷ とアイドル回転数調整量ＶＩ から排気ブレーキ作動のエンジン回転数ＮＯＮ及び排気ブレーキ非作動のエンジン回転数ＮＯＦＦ を決定し、回転センサ２によりその時のエンジン回転数ＮＥ を検出し（ステップＳ３）、ステップＳ４に進み排気ブレーキコントロールユニット１０はＮＥ ＞ＮＯＮであるか否かを判断して、ＮＥ ＞ＮＯＮの場合（ステップＳ４においてＹＥＳ）はステップＳ５に進み、排気ブレーキ装置９を作動（ＯＮ）させて制御は元に戻る。
【００１３】
ＮＥ ＞ＮＯＮでない場合（ステップＳ４においてＮＯ）はステップＳ６に進み、排気ブレーキコントロールユニット１０はＮＥ ≦ＮＯＦＦ であるか否かを判断して、ＮＥ ≦ＮＯＦＦ 場合（ステップＳ６においてＹＥＳ）はステップＳ７に進み、排気ブレーキを非作動（ＯＦＦ）として制御は元に戻る。ＮＥ ≦ＮＯＦＦ でない場合（ステップＳ６においてＮＯ）はステップＳ８に進み、前回の排気ブレーキ状態を維持して制御は元に戻る。
【００１４】
【発明の効果】
以上のように構成及び、制御される本発明の排気ブレーキ制御装置によれば、水温又は、アイドル回転数調整手段の信号が変化して、エンジンのアイドリング回転数が変化しても、常にアイドル回転数よりも排気ブレーキ解除設定回転数の方が大で、且つ排気ブレーキ作動設定回転数は排気ブレーキ解除設定回転数よりも大であるので、アイドリング時には必ず排気ブレーキは解除となり、エンジン停止やアイドリング時のスモーク発生も防止することが出来る。
【図面の簡単な説明】
【図１】本発明の全体構成図。
【図２】本発明の制御ブロック図。
【図３】本発明の制御フロー図。
【図４】本発明の排気ブレーキＯＮ、ＯＦＦ時のエンジン回転数及びアイドル回転数と水温の関係を示す図。
【図５】本発明の排気ブレーキ作動パターン図。（水温がＷＴ１時）
【図６】本発明の排気ブレーキ作動パターン図。（水温がＷＴ２時）
【図７】本発明の排気ブレーキＯＮ、ＯＦＦ時のエンジン回転数及びアイドル回転数とアイドル回転数調整量の関係を示す図。
【図８】従来技術による制御ブロック図。
【図９】従来技術による排気ブレーキＯＮ、ＯＦＦ時のエンジン回転数及びアイドル回転数と水温の関係を示す図。
【符号の説明】
１・・・水温センサ
２・・・回転センサ
３・・・アイドル回転数調整手段
４・・・排気管
５・・・排気ブレーキバルブ
６・・・アクチュエータ
７・・・電磁弁
８・・・エアタンク
９・・・排気ブレーキ装置
１０・・・排気ブレーキコントロールユニット
１５・・・エンジン[0001]
[Industrial application fields]
The present invention has an exhaust brake operation having a water temperature sensor, a rotation sensor, and an idle rotation speed adjustment means, and a control unit for operating the exhaust brake device by signals from the water temperature sensor, the rotation sensor, and the idle rotation speed adjustment means. The present invention relates to a control device.
[0002]
[Prior art]
As shown in the block diagram of exhaust brake control in FIG. 8 as a conventional technology, the engine speed (NE) is always detected by a rotation sensor in order to prevent engine stop and smoke generation due to exhaust brake operation during idling. With respect to the exhaust brake operating speed (NON: fixed value) and exhaust brake non-operating speed (NOFF fixed value), the exhaust brake control unit has the engine speed NE less than NOFF. There is a technique for releasing an exhaust brake by sending an operation signal to the exhaust brake device when it is determined that the exhaust brake has been applied.
[0003]
[Problems to be solved by the invention]
However, the above-described technology has a water temperature detection means or an idle rotation speed adjustment means, and the fuel injection system-equipped engine capable of varying the idle rotation speed by a signal from the water temperature detection means or the idle rotation speed adjustment means. In this case, the idle speed (NI) increases to the idling speed (NI ') equal to or higher than the set speed (NOFF) as shown in FIG. In this case, the exhaust brake is not released, and it is impossible to stop the engine and prevent the occurrence of smoke.
[0004]
Therefore, in the exhaust brake operation control device of the present invention, when the idling speed is changed by the water temperature or the idling speed adjusting means, the speed for releasing the exhaust brake is also changed, and the idling speed is set at idling. The purpose is to control the exhaust brake to be released even if it changes.
[0005]
[Means for Solving the Problems]
The exhaust brake operation control device of the present invention has a water temperature sensor, a rotation sensor, and an idle rotation speed adjustment means, and a control for operating the exhaust brake device by signals from the water temperature sensor, the rotation sensor, and the idle rotation speed adjustment means. In the exhaust brake operation control apparatus having the unit, the control unit is configured to output the exhaust brake release rotation speed and the exhaust brake operation rotation speed greater than the exhaust brake release rotation speed by outputs from the water temperature sensor and the idle rotation speed adjusting means. When the engine speed is higher than the exhaust brake operating speed, the exhaust brake is operated, and when the engine speed is equal to or lower than the exhaust brake release speed. Stops the operation of the exhaust brake, and the engine speed is lower than the exhaust brake operation speed and higher than the release speed. Time has the function of maintaining the previous exhaust braking state.
[0006]
[Action]
According to the present invention, even if the signal of the water temperature or the idling engine speed adjusting means changes and the idling engine speed of the engine changes, the exhaust brake release set engine speed is always larger than the engine engine idling engine speed. Further, since the exhaust brake operation set rotational speed is larger than the exhaust brake release set rotational speed, the exhaust brake is always released during idling.
[0007]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0008]
In FIG. 1, an engine 15 includes a water temperature sensor 1 for detecting the coolant temperature, a rotation sensor 2 for detecting the engine speed, and, for example, idle rotation of the engine 2 by adjusting the fuel injection amount. An idle speed adjusting means 3 for adjusting the number, an exhaust brake valve 5 interposed in the exhaust pipe 4, an actuator 6 for opening and closing the exhaust brake valve 5, an electromagnetic valve 7 for operating the actuator 6, and the electromagnetic valve 7 2 is also used, and the water temperature sensor 1, the water temperature from the idle speed adjusting means 3, and the input signal for the idle speed adjustment amount are more appropriate. The engine speed NON with the exhaust brake activated and the engine speed NOFF with the exhaust brake deactivated are calculated, and the engine speed detected by the rotation sensor 2 is calculated. By comparing the rotational speed NE with the engine speed NON with the exhaust brake activated and the engine speed NOFF with the exhaust brake deactivated, it is determined whether the exhaust brake is activated, the current control state is maintained, or the exhaust brake is not activated. The exhaust brake control unit 10 is configured to send a control signal to the electromagnetic valve 7 of the exhaust brake device 9.
[0009]
FIG. 4 is a graph showing the relationship between the engine speed NON of the proper exhaust brake operation corresponding to the water temperature WTn at a certain time and the engine speed NOFF of the exhaust brake non-actuated. Even if Ni changes, the engine speed NOFF when the exhaust brake is not operated always exceeds the idle speed Ni 2. Therefore, in any idling state as is apparent from the diagrams showing the exhaust brake operation patterns of FIGS. Can also release the exhaust brake. As shown in FIG. 5, in the prior art, the engine speed NON when the exhaust brake is operated and the engine speed NOFF when the exhaust brake is not operated are fixed. Therefore, when the idle speed Ni exceeds the engine speed NON when the exhaust brake is operated, The exhaust brake will not be released.
[0010]
FIG. 7 is a graph showing the relationship between the engine speed NON of the proper exhaust brake operation and the engine speed NOFF of the non-exhaust brake operation corresponding to the aforementioned idle rotation adjustment amount Vin at a certain time. The exhaust brake operation pattern at this time is qualitatively the same as in FIGS.
[0011]
Next, the control flow will be described with reference to FIG.
[0012]
First, in step S1, the water temperature TW is detected by the water temperature sensor 1 and the idle rotation speed adjustment amount VI is detected from the idle rotation speed adjusting means 3. The process proceeds to step S2, and the exhaust brake control unit 10 controls the water temperature TW and the idle rotation speed. The engine speed NON with the exhaust brake activated and the engine speed NOFF with the exhaust brake deactivated are determined from the number adjustment amount VI, and the engine speed NE at that time is detected by the rotation sensor 2 (step S3). The brake control unit 10 determines whether or not NE> NON, and if NE> NON (YES in step S4), the process proceeds to step S5, and the exhaust brake device 9 is activated (ON) and the control is based on Return.
[0013]
If NE> NON is not satisfied (NO in step S4), the process proceeds to step S6, and the exhaust brake control unit 10 determines whether NE ≦ NOFF or not. If NE ≦ NOFF (YES in step S6), the process proceeds to step S7. Then, the exhaust brake is deactivated (OFF) and the control returns. If NE ≦ NOFF is not satisfied (NO in step S6), the process proceeds to step S8, the previous exhaust brake state is maintained, and the control returns to the original.
[0014]
【The invention's effect】
According to the exhaust brake control device of the present invention that is configured and controlled as described above, even if the water temperature or the signal of the idle speed adjusting means changes and the idling speed of the engine changes, the idling speed always changes. The exhaust brake release setting speed is higher than the engine speed, and the exhaust brake operation setting speed is higher than the exhaust brake release setting speed. Therefore, the exhaust brake is always released when idling, and the engine is stopped or idling. Smoke generation can also be prevented.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of the present invention.
FIG. 2 is a control block diagram of the present invention.
FIG. 3 is a control flow diagram of the present invention.
FIG. 4 is a graph showing the relationship between the engine speed and idle speed when the exhaust brake is ON and OFF and the water temperature according to the present invention.
FIG. 5 is an exhaust brake operation pattern diagram of the present invention. (Water temperature is WT1)
FIG. 6 is an exhaust brake operation pattern diagram of the present invention. (Water temperature is WT2)
FIG. 7 is a graph showing the relationship between the engine speed and idle speed when the exhaust brake is ON and OFF, and the idle speed adjustment amount according to the present invention.
FIG. 8 is a control block diagram according to the prior art.
FIG. 9 is a graph showing the relationship between engine speed and idling speed and water temperature when exhaust brake is ON and OFF according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Water temperature sensor 2 ... Rotation sensor 3 ... Idle rotation speed adjustment means 4 ... Exhaust pipe 5 ... Exhaust brake valve 6 ... Actuator 7 ... Solenoid valve 8 ... Air tank 9 ... Exhaust brake device 10 ... Exhaust brake control unit 15 ... Engine

Claims (1)

水温センサと回転センサとアイドル回転数調整手段を有し、それらの水温センサと回転センサとアイドル回転数調整手段とからの信号により排気ブレーキ装置を作動させる制御ユニットを有する排気ブレーキ作動制御装置において、制御ユニットは水温センサとアイドル回転数調整手段とからの出力により排気ブレーキの解除回転数とこの排気ブレーキの解除回転数よりも大である排気ブレーキの作動回転数とを決定し、エンジンの回転数が排気ブレーキの作動回転数よりも大の場合には排気ブレーキを作動させ、エンジンの回転数が排気ブレーキの解除回転数と等しいかそれよりも小の場合は排気ブレーキの作動を停止させ、エンジンの回転数が排気ブレーキの作動回転数より小で解除回転数より大のときは前回の排気ブレーキ状態を維持する機能を有することを特徴とする排気ブレーキ作動制御装置。In an exhaust brake operation control device having a water temperature sensor, a rotation sensor, and an idle rotation speed adjustment means, and having a control unit that operates the exhaust brake device by signals from the water temperature sensor, the rotation sensor, and the idle rotation speed adjustment means, The control unit determines the release speed of the exhaust brake and the operating speed of the exhaust brake, which is greater than the release speed of the exhaust brake, based on the outputs from the water temperature sensor and the idle speed adjusting means, and the engine speed. When the engine speed is higher than the exhaust brake operating speed, the exhaust brake is operated. When the engine speed is equal to or lower than the exhaust brake releasing speed, the exhaust brake is stopped. When the engine speed is lower than the exhaust brake operating speed and higher than the release speed, the previous exhaust brake state is maintained. Exhaust brake activation control apparatus characterized by having that function.
JP14312595A 1995-06-09 1995-06-09 Exhaust brake operation control device Expired - Lifetime JP3622868B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14312595A JP3622868B2 (en) 1995-06-09 1995-06-09 Exhaust brake operation control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14312595A JP3622868B2 (en) 1995-06-09 1995-06-09 Exhaust brake operation control device

Publications (2)

Publication Number Publication Date
JPH08338268A JPH08338268A (en) 1996-12-24
JP3622868B2 true JP3622868B2 (en) 2005-02-23

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