JP4305910B2 - Engine intake air amount detection device - Google Patents

Engine intake air amount detection device Download PDF

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JP4305910B2
JP4305910B2 JP2004025127A JP2004025127A JP4305910B2 JP 4305910 B2 JP4305910 B2 JP 4305910B2 JP 2004025127 A JP2004025127 A JP 2004025127A JP 2004025127 A JP2004025127 A JP 2004025127A JP 4305910 B2 JP4305910 B2 JP 4305910B2
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air
engine
amount
pressure
compressor
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JP2005214154A (en
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中 清 雅 田
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UD Trucks Corp
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Description

本発明は、エンジン駆動のエアコンプレッサを備え、エアフローメータを有する空気供給ラインから分岐してエンジン吸入空気とそのエアコンプレッサからエアブレーキやエアサスペンション等の負荷に供給する空気とを供給する空気供給システムのエンジン吸入空気量の検知装置に関する。   The present invention is an air supply system that includes an engine-driven air compressor and supplies engine intake air and air supplied from the air compressor to a load such as an air brake or air suspension by branching from an air supply line having an air flow meter. The present invention relates to an engine intake air amount detection device.

周知の通り、車両ではエアブレーキ、エアスプリングその他の圧縮空気を必要とする負荷に空気を供給するために、エンジン駆動のエアコンプレッサを備えている（特許文献１参照）。
そしてエアコンプレッサはエンジンのシリンダへ流入する吸気ラインから空気を吸い込む技術も知られている。そのためにエアコンプレッサから負荷に供給するラインとエンジンに供給するラインがあり２つの空気ラインに分けて供給するようになっている。 As is well known, an engine is equipped with an air compressor driven by an engine in order to supply air to a load that requires compressed air, such as an air brake, an air spring, or the like (see Patent Document 1).
A technique is also known in which an air compressor sucks air from an intake line flowing into a cylinder of an engine. For this purpose, there are a line for supplying the load from the air compressor and a line for supplying to the engine, which are divided into two air lines.

また周知の通り、エアコンプレッサからの空気はタンクに貯えられ、そのタンク内の圧力が所定値以下になるとエアコンプレッサが作動し（この状態をロードという）、別の所定値以上になるとエアコンプレッサが停止する（この状態をアンロードという）ようになっている。   As is well known, the air from the air compressor is stored in a tank. When the pressure in the tank falls below a predetermined value, the air compressor operates (this state is called load). It stops (this state is called unloading).

図４は従来の空気供給システムを示し、空気供給ライン１にはエアフローメータ２が設けられ、そして分岐ライン１ａを経てエンジン３に接続されると共に別の分岐ライン１ｂを経てエアコンプレッサ４に接続されている。このエアコンプレッサ４からは負荷への空気ライン５が延びている。他方、エンジン３にはエアフローメータ２から信号ライン６を介して制御手段７が接続され、この制御手段７はエンジン３を制御するようになっている。   FIG. 4 shows a conventional air supply system, in which an air flow meter 2 is provided in the air supply line 1 and connected to the engine 3 via a branch line 1a and to an air compressor 4 via another branch line 1b. ing. An air line 5 to the load extends from the air compressor 4. On the other hand, a control means 7 is connected to the engine 3 via the signal line 6 from the air flow meter 2, and the control means 7 controls the engine 3.

車両の走行に際して必要な総空気量を知ることは必要であるが、従来技術ではエンジンに必要な空気量を把握できず、そのためにエンジンの上流側にエアフローセンサを別に設ければよいが、それでは部品が多く、また全体的な制御が複雑となる。
さらに分岐ライン１ｂをエアフローメータ２の上流側に接続するとエアフロセンサ検出部の流れが乱れ、正確に流量を検知できない。
特開平９−３２３５２４号公報 Although it is necessary to know the total amount of air required when the vehicle is traveling, the conventional technology cannot grasp the amount of air required for the engine, and for that purpose, a separate air flow sensor may be provided upstream of the engine. There are many parts, and overall control becomes complicated.
Further, if the branch line 1b is connected to the upstream side of the air flow meter 2, the flow of the air flow sensor detection unit is disturbed, and the flow rate cannot be detected accurately.
JP-A-9-323524

したがって、本発明の目的は、１つのエアフローメータでも簡単な手段で正確なエンジン吸入空気量を知ることができるエンジン吸入空気量の検知装置を提供することにある。
本発明の他の目的は、従来の２つの空気ラインによるエンジンとエアコンプレッサとの供給システムにおいて簡単にエンジンの空気吸入量を正確に知ることができるエンジン吸入空気量の検知装置を提供することにある。 Accordingly, an object of the present invention is to provide an engine intake air amount detection device that can know an accurate engine intake air amount with a simple means even with a single air flow meter.
Another object of the present invention is to provide an engine intake air amount detection device that can easily and accurately know the air intake amount of an engine in a conventional supply system of an engine and an air compressor using two air lines. is there.

本発明によれば、エンジン（３）駆動のエアコンプレッサ（４）を備え、エアフローメータ（２）を有する空気供給ライン（１）からそれぞれ分岐ライン（１ａ、１ｂ）を経てエンジン（３）および前記エアコンプレッサ（４）へ空気が供給されており、そのエアコンプレッサ（４）の空気ライン（５）には圧力センサ（９）を設けたタンク（８）が介装され負荷（Ｗ）に空気が供給されている空気供給システムにおけるエンジン（３）の吸入空気量検知装置において、エンジンの回転センサ（１０）を設け、その回転センサ（１０）と前記圧力センサ（９）とに接続した制御手段（７）を設け、その制御手段（７）には前記圧力センサ（９）の信号によりロードかアンロードかを判断する判定回路（１１）と、回転数と空気量との関係を記憶した記憶手段（１３ａ）を有して前記回転センサ（１０）と判定回路（１１）とからの信号を受け空気量の較正を行う較正手段（１３）とを備えた構成であり、そしてタンク内圧力を検出し（ステップＳ１）、その検出圧力が所定圧以上（ステップＳ２：Ｙｅｓ）であればアンロードと判定（ステップＳ３）してエアフローメータ（２）の検出値からエンジン（３）への空気供給量を決定（ステップＳ４）し、前記タンク内圧力の検出圧力が所定値未満（ステップＳ２：Ｎｏ）であればロードと判定（ステップＳ５）し、さらにエンジン回転数を検出（ステップＳ６）して特性曲線からコンプレッサへの空気供給量を決定（ステップＳ７）し、エアフローメータ（２）の検出値からそのコンプレッサへの空気供給量を減算してエンジン（３）への空気供給量を決定（ステップＳ８）する機能を有していることを特徴とするエンジン吸入空気量の検知装置。   According to the present invention, an engine (3) driven air compressor (4) is provided, and an air supply line (1) having an air flow meter (2) passes through the branch lines (1a, 1b) and the engine (3) and the above-mentioned Air is supplied to the air compressor (4). A tank (8) provided with a pressure sensor (9) is interposed in the air line (5) of the air compressor (4), and air is supplied to the load (W). In the intake air amount detection device of the engine (3) in the supplied air supply system, an engine rotation sensor (10) is provided, and control means (connected to the rotation sensor (10) and the pressure sensor (9) ( 7), and the control means (7) includes a determination circuit (11) for determining whether to load or unload based on the signal from the pressure sensor (9), and the relationship between the rotational speed and the air amount. A storage means (13a) and a calibration means (13) for receiving a signal from the rotation sensor (10) and the determination circuit (11) to calibrate the air amount, and in the tank If the pressure is detected (step S1) and the detected pressure is equal to or higher than a predetermined pressure (step S2: Yes), it is determined that the load is unloaded (step S3), and the detected value of the air flow meter (2) is sent to the engine (3). An air supply amount is determined (step S4), and if the detected pressure of the tank internal pressure is less than a predetermined value (step S2: No), it is determined as a load (step S5), and further the engine speed is detected (step S6). Then, the air supply amount to the compressor is determined from the characteristic curve (step S7), and the engine (3 is subtracted from the air supply amount to the compressor from the detected value of the air flow meter (2). Determining the amount of air supplied to (step S8) the engine intake air amount detection apparatus characterized by having a function of.

したがって、エアフローメータからの検出値はエアコンプレッサが不作動時（アンロード時）にはそのままエンジンへの空気吸入量となるが、エアコンプレッサの作動時（ロード時）にはエアコンプレッサの容量とエンジンの回転数とから負荷に流れる空気量を求めて、その値を減算することで、エンジン３の空気量を検知できる。   Therefore, the detected value from the air flow meter is the amount of air sucked into the engine when the air compressor is not operating (unloading), but when the air compressor is operating (loading), the capacity of the air compressor and the engine The air amount of the engine 3 can be detected by obtaining the amount of air flowing to the load from the rotational speed of the engine and subtracting that value.

本発明によれば、１つのエアフローメータを用いても制御手段のソフトの改良のみでエンジンへの空気量を知ることができ、従来技術の改良が楽であり、また総空気量による制御が便利である。   According to the present invention, it is possible to know the air amount to the engine only by improving the software of the control means even if one air flow meter is used, the improvement of the prior art is easy, and the control by the total air amount is convenient. It is.

以下図面を参照して本発明の実施例を説明する。図１は本発明を実施したブロック図を示し、図２において空気供給ライン１からの空気はエアフローメータ２を介して分岐ライン１ａ、１ｂを経てエンジン３およびエアコンプレッサ４に流れる点は図４の従来例と同様である。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of the present invention. In FIG. 2, the air from the air supply line 1 flows to the engine 3 and the air compressor 4 through the branch lines 1a and 1b via the air flow meter 2 in FIG. This is the same as the conventional example.

エアコンプレッサ４からの空気ライン５はタンク８を介してエアブレーキやエアサスペンションのような負荷Ｗに供給するようになっている。このタンク８には圧力センサ９が設けられている。またエンジン３には回転センサ１０が設けられている。   An air line 5 from the air compressor 4 is supplied to a load W such as an air brake or an air suspension via a tank 8. The tank 8 is provided with a pressure sensor 9. The engine 3 is provided with a rotation sensor 10.

制御手段７は圧力センサ９からの信号によって、ロード又はアンロードを判定する判定回路１１と、指示噴射量１２と前記判定回路１１からの信号とを受ける較正手段１３と、その較正手段１３からの信号および前記エアフローメータ２からの信号を受けるエンジン空気供給量決定手段１４と、そのエンジン空気供給量決定手段１４からの信号を受けるエンジン制御手段１５とを備え、そのエンジン制御手段１５によりエンジン３を制御するようになっている。なお、この制御手段７は、その他過給圧、燃料噴射量、ＥＧＲ開度を制御するものである。   The control means 7 is based on a signal from the pressure sensor 9 to determine whether the load or unload is determined, a calibration means 13 that receives the command injection amount 12 and the signal from the determination circuit 11, and the calibration means 13 The engine air supply amount determining means 14 for receiving the signal and the signal from the air flow meter 2 and the engine control means 15 for receiving the signal from the engine air supply amount determining means 14 are provided. It comes to control. The control means 7 controls other supercharging pressure, fuel injection amount, and EGR opening.

前記較正手段１３は記憶手段１３ａを備え、その記憶手段にはエンジン回転数センサ１０からの信号を受けてエンジンの回転数と空気の必要量との関係を示すマップ又は特性曲線が記憶されている。したがって、後述の通りエアコンプレッサの容量とエアコンプレッサの回転数とはあらかじめ解っているので、ロード時にエアコンプレッサの消費空気量は計算でき、エアフローメータ２を流れる総空気量からエアコンプレッサの消費空気量を引けば、エンジンへの供給空気量を求めることができる。   The calibration means 13 includes a storage means 13a, which stores a map or characteristic curve indicating the relationship between the engine speed and the required amount of air in response to a signal from the engine speed sensor 10. . Therefore, since the capacity of the air compressor and the rotation speed of the air compressor are known in advance as described later, the amount of air consumed by the air compressor can be calculated at the time of loading, and the amount of air consumed by the air compressor can be calculated from the total amount of air flowing through the air flow meter 2. The amount of air supplied to the engine can be obtained by subtracting.

図２はエンジン空気供給量決定手段１４を含む制御手段７の作動の説明図である。
図示の実施例では、エアフローメータ２は電圧信号６を出力し、この電圧信号６は変換装置２０で測定値に変換される。他方、圧力スイッチ９のオンオフ信号はスイッチ２１に入力される。このスイッチ２１は圧力スイッチ９がオンのときに位置０に、またオフのときに位置１になるようになっている。そして前記変換装置２０からの信号は直接にスイッチ２１の位置１にそして減算手段２２を介して位置０に接続されている。この減算手段２２には前記マップを有する記憶手段１３ａからの信号が入力されており、したがって、スイッチ２１が位置０にあるときはエアコンプレッサ４で消費される空気量が減算されるようになっている。このようにしてその結果がエンジン空気量決定手段１４を介して図１のエンジン制御手段１５に出力される。 FIG. 2 is an explanatory view of the operation of the control means 7 including the engine air supply amount determination means 14.
In the illustrated embodiment, the air flow meter 2 outputs a voltage signal 6, which is converted into a measured value by a converter 20. On the other hand, the ON / OFF signal of the pressure switch 9 is input to the switch 21. This switch 21 is set to position 0 when the pressure switch 9 is on and to position 1 when the pressure switch 9 is off. The signal from the converter 20 is connected directly to position 1 of the switch 21 and to position 0 via the subtracting means 22. The subtracting means 22 is supplied with a signal from the storage means 13a having the map. Therefore, when the switch 21 is at position 0, the amount of air consumed by the air compressor 4 is subtracted. Yes. In this way, the result is output to the engine control means 15 of FIG.

次に主として図３を参照して作動を説明する。
図３において、まずスタートし、タンク８内の圧力Ｐを検出する（ステップＳ１）。制御手段７はその圧力Ｐが所定圧力（最低圧力）に等しいか又は大きいかを判断し（ステップＳ２）、ＹＥＳの場合は、エアコンプレッサ４が作動していないアンロードと判定する（ステップＳ３）。この場合は図２のスイッチ２１が位置１に位置しており、エアフローメータ２からの信号がそのままエンジンへの空気供給量を決定する（ステップＳ４）。 Next, the operation will be described mainly with reference to FIG.
In FIG. 3, the process starts first, and the pressure P in the tank 8 is detected (step S1). The control means 7 determines whether the pressure P is equal to or greater than a predetermined pressure (minimum pressure) (step S2). If YES, it is determined that the air compressor 4 is not operating (step S3). . In this case, the switch 21 in FIG. 2 is located at the position 1, and the signal from the air flow meter 2 determines the air supply amount to the engine as it is (step S4).

他方、ステップＳ２でＮＯであれば、制御手段７はエアコンプレッサ４が作動しているロードと判定し（ステップＳ５）、この場合、図２のスイッチ２１は位置０となる。そしてエンジン回転数および指示噴射量を検出し（ステップＳ６）、記憶手段１３ａのマップ又は特性曲線からエアコンプレッサ４への空気供給量を決定し（ステップＳ７）、減算手段２２がエアフローメータ２で検出された空気流量からステップＳ７で決定された空気供給量を減算してその値をエンジンへの空気供給量とする（ステップＳ８）。   On the other hand, if NO in step S2, the control means 7 determines that the load is operating the air compressor 4 (step S5). In this case, the switch 21 in FIG. Then, the engine speed and the command injection amount are detected (step S6), the air supply amount to the air compressor 4 is determined from the map or characteristic curve of the storage means 13a (step S7), and the subtracting means 22 is detected by the air flow meter 2. The air supply amount determined in step S7 is subtracted from the determined air flow rate, and the value is set as the air supply amount to the engine (step S8).

なお、ステップＳ６はあらかじめステップＳ１で検出してもよい。その場合は、ステップＳ５の次はステップＳ７となる。   Note that step S6 may be detected in advance in step S1. In that case, step S7 is followed by step S7.

以上の通り、エアコンプレッサを有する各種のエンジンにおいて、空気の総供給量を検知すれば、制御手段のソフトのみで、エンジンの空気供給量を求めることができ、ディーゼルエンジン、ガソリンエンジ、ガスエンジン等に広く利用できる。   As described above, in various engines having an air compressor, if the total supply amount of air is detected, the air supply amount of the engine can be obtained only by the software of the control means, such as a diesel engine, a gasoline engine, a gas engine, etc. Widely available.

本発明の一実施例を示すブロック図。The block diagram which shows one Example of this invention. 本発明の原理を示す作動説明図。The operation explanatory view showing the principle of the present invention. 本発明の一実施例のフローチャート図。The flowchart figure of one Example of this invention. 従来技術のブロック図。The block diagram of a prior art.

符号の説明Explanation of symbols

２・・・エアフローメータ
３・・・エンジン
４・・・エアコンプレッサ
７・・・制御手段
８・・・タンク
９・・・圧力センサ
１０・・・回転センサ
１１・・・ロード、アンロード判定回路
１２・・・トランスミッション
１３・・・検出手段
１３ａ・・・記憶手段
１４・・・エンジン空気供給量決定手段
１５・・・エンジン制御手段 2 ... Air flow meter 3 ... Engine 4 ... Air compressor 7 ... Control means 8 ... Tank 9 ... Pressure sensor 10 ... Rotation sensor 11 ... Load / Unload determination circuit 12 ... Transmission 13 ... Detection means 13a ... Storage means 14 ... Engine air supply amount determination means 15 ... Engine control means

Claims (1)

エンジン（３）駆動のエアコンプレッサ（４）を備え、エアフローメータ（２）を有する空気供給ライン（１）からそれぞれ分岐ライン（１ａ、１ｂ）を経てエンジン（３）および前記エアコンプレッサ（４）へ空気が供給されており、そのエアコンプレッサ（４）の空気ライン（５）には圧力センサ（９）を設けたタンク（８）が介装され負荷（Ｗ）に空気が供給されている空気供給システムにおけるエンジン（３）の吸入空気量検知装置において、エンジンの回転センサ（１０）を設け、その回転センサ（１０）と前記圧力センサ（９）とに接続した制御手段（７）を設け、その制御手段（７）には前記圧力センサ（９）の信号によりロードかアンロードかを判断する判定回路（１１）と、回転数と空気量との関係を記憶した記憶手段（１３ａ）を有して前記回転センサ（１０）と判定回路（１１）とからの信号を受け空気量の較正を行う較正手段（１３）とを備えた構成であり、そしてタンク内圧力を検出し、その検出圧力が所定圧以上であればアンロードと判定してエアフローメータ（２）の検出値からエンジン（３）への空気供給量を決定し、前記タンク内圧力の検出圧力が所定値未満であればロードと判定し、さらにエンジン回転数を検出して特性曲線からコンプレッサへの空気供給量を決定し、エアフローメータ（２）の検出値からそのコンプレッサへの空気供給量を減算してエンジン（３）への空気供給量を決定する機能を有していることを特徴とするエンジン吸入空気量の検知装置。 An air compressor (4) driven by the engine (3) is provided, and from the air supply line (1) having the air flow meter (2) to the engine (3) and the air compressor (4) via the branch lines (1a, 1b), respectively. An air supply in which air is supplied, a tank (8) provided with a pressure sensor (9) is interposed in the air line (5) of the air compressor (4), and air is supplied to a load (W) In the intake air amount detection device for the engine (3) in the system, an engine rotation sensor (10) is provided, and a control means (7) connected to the rotation sensor (10) and the pressure sensor (9) is provided. The control means (7) includes a determination circuit (11) for determining whether to load or unload based on a signal from the pressure sensor (9), and a storage means (stores the relationship between the rotational speed and the air amount). 3a) and a calibration means (13) that receives signals from the rotation sensor (10) and the determination circuit (11) and calibrates the air amount, and detects the pressure in the tank. If the detected pressure is equal to or higher than a predetermined pressure, it is determined that the engine is unloaded and the amount of air supplied to the engine (3) is determined from the detected value of the air flow meter (2). The detected pressure of the tank internal pressure is less than the predetermined value. If this is the case, it is determined as a load, and further, the engine speed is detected, the air supply amount to the compressor is determined from the characteristic curve, and the air supply amount to the compressor is subtracted from the detected value of the air flow meter (2). An engine intake air amount detection device having a function of determining an air supply amount to (3).
JP2004025127A 2004-02-02 2004-02-02 Engine intake air amount detection device Expired - Lifetime JP4305910B2 (en)

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