JP5791442B2 - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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Publication number
JP5791442B2
JP5791442B2 JP2011204224A JP2011204224A JP5791442B2 JP 5791442 B2 JP5791442 B2 JP 5791442B2 JP 2011204224 A JP2011204224 A JP 2011204224A JP 2011204224 A JP2011204224 A JP 2011204224A JP 5791442 B2 JP5791442 B2 JP 5791442B2
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intake
hose
internal combustion
combustion engine
pressure sensor
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JP2013064376A (en
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順也 大崎
順也 大崎
知仁 高橋
知仁 高橋
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Daihatsu Motor Co Ltd
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本発明は、車両等に設けられる内燃機関に関する。   The present invention relates to an internal combustion engine provided in a vehicle or the like.

従来より、吸気経路内の圧力を検知する吸気圧センサを吸気経路内に設け、この吸気圧センサから出力される信号に基づき内燃機関の制御が行われてきている。このような内燃機関において、回転数が特定の値をとる際に吸気経路内において大きな吸気脈動が発生し、この吸気経路内に設けた吸気圧センサが吸気脈動の影響により誤作動し、吸気圧センサの誤作動によりトルク変動が発生し、このトルク変動に伴いサージ（大きな車体振動）がさらに発生するという問題が起こりうる。   Conventionally, an intake pressure sensor for detecting the pressure in the intake passage is provided in the intake passage, and the internal combustion engine is controlled based on a signal output from the intake pressure sensor. In such an internal combustion engine, when the rotational speed takes a specific value, a large intake pulsation occurs in the intake path, and the intake pressure sensor provided in the intake path malfunctions due to the influence of the intake pulsation, and the intake pressure There may be a problem that torque fluctuation occurs due to a malfunction of the sensor, and a surge (large vehicle body vibration) further occurs along with the torque fluctuation.

このような問題に対処する手段の一つとして、吸気圧センサから出力される信号を所定の時間間隔でサンプリングし、得られた信号をデジタルフィルタ処理するものにおいて、内燃機関の運転状態に応じてデジタルフィルタのフィルタ定数を変更するものが挙げられる（例えば、特許文献１を参照）。   As one of means for coping with such a problem, the signal output from the intake pressure sensor is sampled at a predetermined time interval, and the obtained signal is digitally filtered, depending on the operating state of the internal combustion engine. Examples include changing the filter constant of the digital filter (see, for example, Patent Document 1).

ところが、前記特許文献１記載の構成は、吸気脈動が発生した後、吸気圧センサから出力される信号に対するフィルタ処理により吸気脈動による影響を除去するものであり、吸気脈動そのものが低減されるものではない。また、吸気圧センサから出力される信号に対してフィルタ処理を行うので、フィルタ処理に時間を要し、応答性が低くなるという不具合が発生しうる。   However, the configuration described in Patent Document 1 removes the influence of the intake pulsation by filtering the signal output from the intake pressure sensor after the intake pulsation occurs, and the intake pulsation itself is not reduced. Absent. In addition, since the filter process is performed on the signal output from the intake pressure sensor, the filter process takes time, and the responsiveness may be lowered.

特開平１−１５１７５３号公報Japanese Patent Laid-Open No. 1-151753

本発明は以上の点に着目し、回転数が特定の値をとる際に吸気圧センサが検知する吸気脈動そのものを低減し、応答性を維持しつつ吸気圧センサの誤作動を防止又は抑制することを目的とする。   The present invention focuses on the above points, and reduces the intake pulsation itself detected by the intake pressure sensor when the rotation speed takes a specific value, thereby preventing or suppressing malfunction of the intake pressure sensor while maintaining responsiveness. For the purpose.

すなわち本発明に係る内燃機関は、サージタンク及びこのサージタンクよりも下流側かつ前記サージタンクを取り巻くように配された吸気マニホルドを備える吸気経路と、前記吸気経路中のスロットル弁よりも下流側に一端が連通するホースと、このホースの他端に設けた吸気圧センサとを具備する内燃機関であって、前記ホースの長さが、内燃機関の吸気脈動周波数の振動を低減可能な共鳴周波数に対応する長さであるとともに、前記ホースの一部が前記吸気マニホルドの外方に、他の一部が前記吸気マニホルドと重なり合う位置にそれぞれ配されていることを特徴とする。 That is, an internal combustion engine according to the present invention includes a surge tank , an intake passage provided downstream of the surge tank and an intake manifold disposed so as to surround the surge tank, and a downstream side of a throttle valve in the intake passage. An internal combustion engine comprising a hose with one end communicating and an intake pressure sensor provided at the other end of the hose, wherein the length of the hose is a resonance frequency that can reduce vibration of the intake pulsation frequency of the internal combustion engine. The hose has a corresponding length, and a part of the hose is arranged outside the intake manifold, and the other part is arranged at a position overlapping the intake manifold .

このようなものであれば、回転数が特定の値をとる際の吸気経路内における吸気脈動が発生した際に、一端を吸気経路に連通させたホースが吸気脈動に共鳴することによりレゾネータとして機能し、ホースの他端に伝わる吸気脈動を低減させた上でホースの他端に設けた吸気圧センサにより吸気圧を測定しているので、吸気脈動に伴う吸気圧センサの誤作動を防止又は抑制できる。   If this is the case, when an intake pulsation occurs in the intake path when the rotational speed takes a specific value, the hose with one end communicating with the intake path functions as a resonator by resonating with the intake pulsation. In addition, the intake pulsation transmitted to the other end of the hose is reduced and the intake pressure is measured by the intake pressure sensor provided at the other end of the hose, so that the malfunction of the intake pressure sensor due to the intake pulsation is prevented or suppressed. it can.

本発明によれば、回転数が特定の値をとる際に吸気圧センサが検知する吸気脈動そのものを低減し、応答性を維持しつつ吸気圧センサの誤作動を防止又は抑制することができる。   According to the present invention, it is possible to reduce or eliminate the intake pulsation itself detected by the intake pressure sensor when the rotation speed takes a specific value, and to prevent or suppress malfunction of the intake pressure sensor while maintaining responsiveness.

本発明の一実施形態に係る内燃機関を概略的に示す図。1 is a diagram schematically showing an internal combustion engine according to an embodiment of the present invention. 同実施形態に係る内燃機関の吸気経路を概略的に示す図。The figure which shows schematically the intake route of the internal combustion engine which concerns on the same embodiment.

本発明の一実施形態を、図面を参照して説明する。図１に、本実施形態における車両用内燃機関０の概要を示す。内燃機関０は、複数の気筒１（図１には、そのうち一つを図示している）と、各気筒１内に燃料を噴射するインジェクタ１１と、各気筒１内に供給された混合気に着火するための点火プラグ１２と、各気筒１に吸気を供給するための吸気経路２と、各気筒１から排気を排出するための排気経路３とを少なくとも備えている。   An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the outline | summary of the internal combustion engine 0 for vehicles in this embodiment is shown. The internal combustion engine 0 includes a plurality of cylinders 1 (one of which is shown in FIG. 1), an injector 11 that injects fuel into each cylinder 1, and an air-fuel mixture supplied into each cylinder 1. At least an ignition plug 12 for igniting, an intake path 2 for supplying intake air to each cylinder 1, and an exhaust path 3 for discharging exhaust from each cylinder 1 are provided.

吸気経路２は、外部から空気を取り入れて気筒１の吸気ポートへと導く。吸気経路２上には、吸気ダクト２１、エアクリーナ２２、電子スロットルバルブ２３、サージタンク２４及び吸気マニホルド２５を、上流からこの順序に配置している。   The intake path 2 takes in air from the outside and guides it to the intake port of the cylinder 1. On the intake path 2, an intake duct 21, an air cleaner 22, an electronic throttle valve 23, a surge tank 24, and an intake manifold 25 are arranged in this order from the upstream.

排気経路３は、気筒１内で燃料を燃焼させることで発生する燃焼ガス、即ち排気を気筒１の排気ポートから外部へと導く。この排気経路３上には、排気マニホルド３２及び三元触媒３１を配置している。   The exhaust path 3 guides combustion gas generated by burning fuel in the cylinder 1, that is, exhaust gas, from the exhaust port of the cylinder 1 to the outside. An exhaust manifold 32 and a three-way catalyst 31 are disposed on the exhaust path 3.

内燃機関０の運転制御を司るＥＣＵ（電子制御装置）４は、プロセッサ、メモリ、入力インタフェース、出力インタフェース等を有したマイクロコンピュータシステムである。   An ECU (electronic control unit) 4 that controls operation of the internal combustion engine 0 is a microcomputer system having a processor, a memory, an input interface, an output interface, and the like.

入力インタフェースには、車速を検出する車速センサ９１から出力される車速信号ａ、エンジン回転数を検出する回転数センサ９２から出力される回転数信号ｂ、アクセルペダルの踏込量を検出するアクセルセンサ９３から出力されるアクセル開度要求信号ｃ、サージタンク２４内の吸気圧を検出する吸気圧センサ９４から出力される吸気圧信号ｄ、サージタンク２４の吸気温を検出する温度センサ９５から出力される吸気温信号ｅ等が入力される。   The input interface includes a vehicle speed signal a output from the vehicle speed sensor 91 that detects the vehicle speed, a rotation speed signal b output from the rotation speed sensor 92 that detects the engine speed, and an accelerator sensor 93 that detects the amount of depression of the accelerator pedal. Is output from a temperature sensor 95 that detects the intake air temperature of the surge tank 24. The accelerator opening request signal c is output from the intake pressure signal d that is output from the intake pressure sensor 94 that detects the intake pressure in the surge tank 24. An intake air temperature signal e or the like is input.

出力インタフェースからは、インジェクタ１１に対して燃料噴射信号ｆ、点火プラグ１２（のイグニッションコイル）に対して点火信号ｇ、電子スロットルバルブ２３に対して開度操作信号ｈ等を出力する。   From the output interface, a fuel injection signal f is output to the injector 11, an ignition signal g is output to the ignition plug 12 (ignition coil thereof), and an opening operation signal h is output to the electronic throttle valve 23.

ＥＣＵ４のプロセッサは、予めメモリに格納されているプログラムを解釈、実行して、内燃機関０の運転を制御する。ＥＣＵ４は、内燃機関０の運転制御に必要な各種情報ａ、ｂ、ｃ、ｄ、ｅを入力インタフェースを介して取得し、それらに基づいて吸気量や要求燃料噴射量、点火時期、要求ＥＧＲガス量等を演算する。そして、演算結果に対応した各種制御信号ｆ、ｇ、ｈを出力インタフェースを介して印加する。   The processor of the ECU 4 controls the operation of the internal combustion engine 0 by interpreting and executing a program stored in advance in the memory. The ECU 4 acquires various information a, b, c, d, and e necessary for operation control of the internal combustion engine 0 via the input interface, and based on them, the intake air amount, the required fuel injection amount, the ignition timing, the required EGR gas Calculate quantity etc. Then, various control signals f, g, and h corresponding to the calculation result are applied through the output interface.

しかして本実施形態では、前記図１、及びこの内燃機関の側面を概略的に示す図である図２に示すように、前記サージタンク２４に一端５ａが連通するホース５を設けている。また、このホース５の他端５ｂに、前記吸気圧センサ９４を設けている。   Therefore, in the present embodiment, as shown in FIG. 1 and FIG. 2 which is a diagram schematically showing a side surface of the internal combustion engine, a hose 5 having one end 5a communicating with the surge tank 24 is provided. The intake pressure sensor 94 is provided at the other end 5 b of the hose 5.

このホース５の長さＬは、内燃機関０の回転数が特定の値となった場合に発生する吸気脈動の周波数ｆに対応する長さに設定している。より具体的には、内燃機関０の吸気脈動の周波数をｆ、音速をｃとした際に次の式（１）により算出される長さＬ1の奇数倍、例えば１倍の長さにこのホース５の長さＬを設定している。なお、内燃機関０の吸気脈動の周波数ｆは、予め実験により決定する。 The length L of the hose 5 is set to a length corresponding to the frequency f of the intake pulsation that occurs when the rotational speed of the internal combustion engine 0 reaches a specific value. More specifically, when the frequency of the intake pulsation of the internal combustion engine 0 is f and the speed of sound is c, the length is an odd multiple of the length L 1 calculated by the following equation (1), for example, a length of 1 time. The length L of the hose 5 is set. Note that the frequency f of the intake air pulsation of the internal combustion engine 0 is determined in advance by experiments.

ｆ＝ｃ／４Ｌ1 （１）
すなわち、吸気経路２内において吸気脈動が発生した際には、ホース５がこの吸気脈動に共鳴し、ホース５の共鳴により該ホース５内においては吸気脈動が打ち消されて吸気圧センサ９４側の端部にサージタンク２４内の圧力が伝達される。換言すれば、このホース５は吸気圧センサ側に伝達される吸気脈動を低減するためのレゾネータとして機能し、吸気圧センサ９４は吸気脈動が打ち消された状態で吸気圧を計測する。 f = c / 4L 1 (1)
That is, when an intake pulsation occurs in the intake path 2, the hose 5 resonates with the intake pulsation, and the resonance of the hose 5 cancels the intake pulsation in the hose 5, thereby causing an end on the intake pressure sensor 94 side. The pressure in the surge tank 24 is transmitted to the part. In other words, the hose 5 functions as a resonator for reducing the intake pulsation transmitted to the intake pressure sensor, and the intake pressure sensor 94 measures the intake pressure with the intake pulsation canceled.

以上に述べたように、本実施形態の構成によれば、回転数が特定の値をとる際の吸気経路２内における吸気脈動が発生した際に、一端５ａ側をサージタンク２４に連通させたホース５が吸気脈動に共鳴することによりレゾネータとして機能し、ホース５の他端５ｂ側に伝わる吸気脈動が低減された状態でホース５の他端５ｂに設けた吸気圧センサ９４により吸気圧が測定される。従って、フィルタ処理を行う代わりに吸気脈動そのものを低減することにより応答性を維持しつつ、吸気圧センサ９４の誤作動を防止又は抑制することができる。   As described above, according to the configuration of the present embodiment, the one end 5a side is communicated with the surge tank 24 when the intake pulsation occurs in the intake path 2 when the rotational speed takes a specific value. The hose 5 functions as a resonator by resonating with the intake pulsation, and the intake pressure is measured by the intake pressure sensor 94 provided at the other end 5b of the hose 5 in a state where the intake pulsation transmitted to the other end 5b of the hose 5 is reduced. Is done. Therefore, the malfunction of the intake pressure sensor 94 can be prevented or suppressed while maintaining the responsiveness by reducing the intake pulsation itself instead of performing the filtering process.

なお、本発明は以上に述べた実施形態に限らない。   The present invention is not limited to the embodiment described above.

例えば、ホースの長さは、上述した式（１）により算出される長さＬ1の奇数倍であれば、前記長さＬ1の１倍でなく３倍や５倍等に設定してもよい。 For example, if the length of the hose is an odd multiple of the length L 1 calculated by the above formula (1), it may be set to 3 times or 5 times instead of 1 time of the length L 1. Good.

また、上述した実施形態では、吸気経路中のサージタンクにホースの一端が連通する態様を採用しているが、吸気経路中のスロットル弁よりも下流側であれば、どの部位にホースの一端を連通させるようにしてもよい。   Further, in the above-described embodiment, a mode is adopted in which one end of the hose communicates with the surge tank in the intake path, but if one end of the hose is downstream of the throttle valve in the intake path, You may make it communicate.

その他、本発明の趣旨を損ねない範囲で種々に変形してよい。   In addition, various modifications may be made without departing from the spirit of the present invention.

０…内燃機関
２…吸気経路
５…ホース
９４…吸気圧センサ DESCRIPTION OF SYMBOLS 0 ... Internal combustion engine 2 ... Intake route 5 ... Hose 94 ... Intake pressure sensor

Claims (1)

サージタンク及びこのサージタンクよりも下流側かつ前記サージタンクを取り巻くように配された吸気マニホルドを備える吸気経路と、前記吸気経路中のスロットル弁よりも下流側に一端が連通するホースと、このホースの他端に設けた吸気圧センサとを具備する内燃機関であって、前記ホースの長さが、内燃機関の吸気脈動周波数の振動を低減可能な共鳴周波数に対応する長さであるとともに、前記ホースの一部が前記吸気マニホルドの外方に、他の一部が前記吸気マニホルドと重なり合う位置にそれぞれ配されていることを特徴とする内燃機関。 An intake path comprising a surge tank and an intake manifold arranged downstream of the surge tank and surrounding the surge tank; a hose having one end communicating with the downstream side of the throttle valve in the intake path; and the hose An intake pressure sensor provided at the other end of the internal combustion engine, wherein the length of the hose is a length corresponding to a resonance frequency capable of reducing vibration of an intake pulsation frequency of the internal combustion engine , and An internal combustion engine characterized in that a part of the hose is arranged outside the intake manifold, and another part is arranged at a position overlapping the intake manifold .
JP2011204224A 2011-09-20 2011-09-20 Internal combustion engine Expired - Fee Related JP5791442B2 (en)

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JP2541561B2 (en) * 1987-06-22 1996-10-09 マツダ株式会社 Engine intake system
JP3034258B2 (en) * 1989-01-24 2000-04-17 マツダ株式会社 Engine intake silencer
JPH0714154U (en) * 1993-08-09 1995-03-10 愛知機械工業株式会社 Resonant tube mounting structure for internal combustion engine
JP2002266676A (en) * 2001-03-09 2002-09-18 Mikuni Corp Intake pipe internal pressure sampling device for internal combustion engine
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