JPS6125948A - Top-signal detector for engine - Google Patents
Top-signal detector for engineInfo
- Publication number
- JPS6125948A JPS6125948A JP14822984A JP14822984A JPS6125948A JP S6125948 A JPS6125948 A JP S6125948A JP 14822984 A JP14822984 A JP 14822984A JP 14822984 A JP14822984 A JP 14822984A JP S6125948 A JPS6125948 A JP S6125948A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- noise
- engine
- top signal
- reading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000002265 prevention Effects 0.000 description 4
- 238000010606 normalization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
く技術分野〉
本発明は、ディーゼル機関、ガス機関等の機関の吸排気
弁の開閉や燃料噴射時期を電子制御するような場合に、
その制御タイミングの基準となる機関のトップ信号を検
出するトップ信号検出装置に関する。[Detailed Description of the Invention] Technical Field> The present invention is applicable to electronic control of opening/closing of intake and exhaust valves and fuel injection timing of engines such as diesel engines and gas engines.
The present invention relates to a top signal detection device that detects an engine top signal that serves as a reference for its control timing.
〈従来技術〉
機関の吸排気弁駆動制御装置においては、機関のトップ
位置を示すトップ信号と、機関の回転速度を示す回転角
信号とを導入して、吸排気弁を開閉すべき位相角に応じ
た位相角信号を生成し、その位相角信号に基づいて吸排
気弁を開閉駆動するようになっており、トップ信号と回
転角信号とが制御タイミングの基準になっている。<Prior art> In an engine intake/exhaust valve drive control device, a top signal indicating the top position of the engine and a rotation angle signal indicating the rotational speed of the engine are introduced to adjust the phase angle at which the intake/exhaust valves should be opened and closed. A corresponding phase angle signal is generated, and the intake and exhaust valves are driven to open and close based on the phase angle signal, and the top signal and rotation angle signal are the reference for control timing.
ところで、上記両信号のうち、トップ信号はカム軸力用
回転する間に１発発生するだけであるから、この信号の
ラインに電気的ノイズが加わり、そのノイズのためにト
ップ信号の読み取Ｉ）を誤るようなことがあると、夕・
イミングか大幅にずれて制御動作に大きな狂いを生じる
おそれがある。一方、回転角信号はクランク軸の１回転
中に多数発生するから、その読み取りを誤っても、制御
タイミングのずれは小さく、制御動作への影響か少ない
。By the way, among the above two signals, the top signal is generated only once during the rotation of the cam shaft force, so electrical noise is added to this signal line, and this noise makes it difficult to read the top signal. If you make a mistake,
There is a risk that the timing may deviate significantly, causing a large error in control operation. On the other hand, since a large number of rotation angle signals are generated during one revolution of the crankshaft, even if they are read incorrectly, the deviation in control timing is small and the influence on control operation is small.
このため従来から、トップ信号についてはその信号ライ
ンに入ってくるノイズを除去するために、種々の対策が
講じられてい−る。ひとつの対策は、ある電圧レベル以
下の信号はノイズとみなし、該レベル以下の信号を除外
することである。しかし、この方法では、電圧レベルの
高いノイズを排除することかできない欠点がある。For this reason, various measures have been conventionally taken to remove noise entering the signal line for the top signal. One countermeasure is to consider signals below a certain voltage level to be noise and exclude signals below that level. However, this method has the disadvantage that it cannot eliminate high voltage level noise.
いまひとつの対策は、積分回路を設けて、周波数の高い
成分を除去することであるが、この方法では周波数の低
いノイズを除去することかでとない欠点がある。Another countermeasure is to provide an integrating circuit to remove high frequency components, but this method has a significant drawback in that it only removes low frequency noise.
しかるに、一般にトップ信号ラインに加わるノイズには
、電圧レベルの高いものや、低周波数のものが多く、例
えば高電圧レベルのノイズとして、機関のシーケンス制
御回路のリレー接点の火花放電から生しるノイズがあり
、低周波数ノイズとしては、商用電源の電磁誘導による
ノイズがある。However, the noise that is added to the top signal line generally has a high voltage level or a low frequency. For example, high voltage level noise is noise generated from spark discharge of relay contacts in an engine's sequence control circuit. Low frequency noise includes noise caused by electromagnetic induction from commercial power supplies.
しかも、トップ信号の検出手段であるセンサがらの信号
ラインは通常、長く延設されてお１）、誘導ノイズを拾
いやすい。また、この信号ラインをシールドしても、静
電結合が生じ、シールドの効果か少ない。Moreover, the signal line of the sensor, which is the means for detecting the top signal, is usually extended for a long time (1) and is likely to pick up induced noise. Furthermore, even if this signal line is shielded, capacitive coupling occurs and the effectiveness of the shield is reduced.
これらの理由から従来の対策では、トップ信号に加わる
ノイズを効果的に排除することができなかった。For these reasons, conventional measures have not been able to effectively eliminate noise added to the top signal.
〈発明の目的〉
本発明は、上述の問題点に鑑みてなされたものであって
、トップ信号の発生可能時期においてのみトップ信号を
拾うようにすることによって、トップ信号に加わわるあ
らゆる種類のノイズを除去し、ノイズ１こよるトップ信
号の誤認を効果的に防止し、トップ信号に基づく制御動
作を正確にすることを目的とする。<Object of the Invention> The present invention has been made in view of the above-mentioned problems, and by picking up the top signal only when the top signal can be generated, all kinds of noise added to the top signal can be removed. The purpose of this invention is to effectively prevent misidentification of the top signal due to noise 1, and to make control operations based on the top signal accurate.
〈発明の構成〉
本発明は、上記の目的を達成するために、機関のトップ
位置を検出してトップ信号を出力する手段と、機関の回
転角を検出して機関の１回転中に多数の回転角信号を出
力する手段と、前記回転角信号を一定数カウントしてト
ップ信号の読み取り禁止期間に対応する読み取り指示信
号を出力する読み取り指示カウンタと、読み取り指示信
号およびトップ信号を導入して、ノイズを除去したトッ
プ信号である正常化トップ信号を出力するデート回路と
を備えたものである。<Structure of the Invention> In order to achieve the above object, the present invention provides a means for detecting the top position of the engine and outputting a top signal, and a means for detecting the rotation angle of the engine and detecting the rotation angle of the engine so as to output a top signal. Introducing means for outputting a rotation angle signal, a read instruction counter that counts the rotation angle signal by a certain number and outputs a read instruction signal corresponding to a top signal reading prohibition period, and a read instruction signal and a top signal, The device is equipped with a date circuit that outputs a normalized top signal that is a top signal from which noise has been removed.
〈実施例〉
以下、本発明を図面に示す実施例に基づいて詳細に説明
する。第１図は本発明の一実施例のプロ・ンク図であっ
て、同図中、符号１は機関のトップ位置を検出する手段
であるトップセンサ、２は機関の回転角を検出する手段
である回転角センサ、３はノイズ防止回路である。前記
トップセンサ１は、カム軸４に固着した１枚の歯５に対
設され、カム軸４力弓回転する毎に１発のトップ信号ｓ
ｂを出力する。また前記回転角センサ２は、クランク軸
６に固着した多数の歯を有するリングギア７に対設され
、クランク軸６の１回転中１こ多数の回転角信号Ｓａを
出力する。前記ノイズ防止回路３は、読み取り指示カウ
ンタ８とＡＮＤゲート９から成る。読み取り指示カウン
タ８は、回転角信号Ｓａを予め設定された一定数だけカ
ウントして、トップ信号Ｓｂの読み取り禁止期間に対応
する読み取り指示信号Ｓｃを出力する。ＡＮＤゲートっ
は、読み取り指示信号Ｓｃおよびトップ位置ｓｂを導入
して、ノイズを除去したトップ信号である正常化トップ
信号Ｓｃｌを出力する。ＡＮＤデート９の出力は前記読
み取１）指示カウンタ８のリセット端子に入力する。符
号１０は位相角発生カウンタで、前記正常化トップ信号
Ｓｄでリセットされ、回転角信号Ｓａを所要数カウント
し、トップ位置からの回転角を示す位相角信号を出力す
る。この位相角信号はＣＰＬｉｌｌに入力し、該ＣＰｔ
ｊ１１において位相角か認識される。<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 1 is a diagram of one embodiment of the present invention, in which reference numeral 1 is a top sensor that is a means for detecting the top position of the engine, and 2 is a means for detecting the rotation angle of the engine. A certain rotation angle sensor, 3, is a noise prevention circuit. The top sensor 1 is disposed opposite to one tooth 5 fixed to the camshaft 4, and generates one top signal s every time the camshaft rotates.
Output b. Further, the rotation angle sensor 2 is disposed opposite to a ring gear 7 having a large number of teeth fixed to the crankshaft 6, and outputs one rotation angle signal Sa during one rotation of the crankshaft 6. The noise prevention circuit 3 includes a read instruction counter 8 and an AND gate 9. The read instruction counter 8 counts the rotation angle signal Sa by a preset constant number and outputs a read instruction signal Sc corresponding to the read prohibition period of the top signal Sb. The AND gate introduces the read instruction signal Sc and the top position sb and outputs a normalized top signal Sc1 which is a top signal from which noise has been removed. The output of the AND date 9 is input to the reset terminal of the reading 1) instruction counter 8. A phase angle generation counter 10 is reset by the normalized top signal Sd, counts a required number of rotation angle signals Sa, and outputs a phase angle signal indicating the rotation angle from the top position. This phase angle signal is input to CPLill, and the CPt
The phase angle is recognized at j11.
上記構成の動作を第２図のタイムチャートに基づいて説
明する。回転角信号Ｓａは読み取り指示カウンタ８に入
力するが、該カウンタ８は正常化トップ信号Ｓｄでリセ
ットされて、回転角信号Ｓ’ａを一定数Ｎカウントし、
読み取り指示信号Ｓｃを出力する。この読み取り指示信
号Ｓｃはカウントの開始と同時に、即ち正常化トップ信
号Ｓｃｌの立ち下か゛り時点にＬレベルとなり、カウン
タ中Ｌレベルに保たれる。このＬレベルの期間かトップ
信号読み取り禁止期間Ｋに対応し、この期間にの長さは
回転角信号Ｓａのカウント数Ｎによって決定される。こ
のカウント数Ｎはリングギア７の歯の全数Ｍから所要数
Ｘを滅じた数で（Ｎ＝Ｍ−ｘ）、所要数×は小さい方が
望ましい。カウント数ＮはＣＰＵＩＩがらバスを通じて
予め読み取り指示カウンタ８に設定しである。カウント
が終了すると、読み取り指示信号ＳｃはＨレベルに戻り
、次に正常化トップ信号Ｓｄでリセットされるまで、Ｈ
レベルに保たれる。ＡＮＤゲート９では、読み取り指示
信号ＳｃｌがＨレベルであるときに、トップ信号ライン
から信号が入力してくると、これを正規のトップ信号ｓ
ｂとして通過させるので、これがそのまま出力側に現わ
れ、正常化トップ信号Ｓｄとして位相角発生カウンタ１
ｏに送出されるが、読み取り禁止期間に中に信号がはい
ってくると、これをノイズとして遮断するので、この信
号は全く出力側に現われない。これによって、トップ信
号ｓｂ発生時期の間でトップ信号ラインに混入してくる
ノイズは、ノイズ防止回路３を通過せず、ノイズを含ま
ないトップ信号が得られることになる。The operation of the above configuration will be explained based on the time chart of FIG. The rotation angle signal Sa is input to the reading instruction counter 8, which is reset by the normalization top signal Sd and counts the rotation angle signal S'a by a fixed number N.
A read instruction signal Sc is output. This read instruction signal Sc becomes L level at the same time as the start of counting, that is, when the normalization top signal Sc1 falls, and is maintained at L level during the counter. This L level period corresponds to the top signal read prohibition period K, and the length of this period is determined by the count number N of the rotation angle signal Sa. This count number N is the number obtained by subtracting the required number X from the total number M of teeth of the ring gear 7 (N=M-x), and it is desirable that the required number x is smaller. The count number N is set in advance in the read instruction counter 8 via the bus from the CPU II. When the count ends, the read instruction signal Sc returns to the H level and remains at the H level until it is reset by the normalization top signal Sd.
maintained at the level. When a signal is input from the top signal line when the read instruction signal Scl is at H level, the AND gate 9 converts it into a regular top signal s.
Since this signal is passed as b, it appears on the output side as it is, and is sent to the phase angle generation counter 1 as the normalized top signal Sd.
However, if a signal enters during the reading prohibition period, this signal is blocked as noise, so that this signal does not appear on the output side at all. As a result, noise that enters the top signal line during the period when the top signal sb is generated does not pass through the noise prevention circuit 3, and a top signal that does not contain noise is obtained.
なお、読み取り指示カウント８からの出力波形によって
は該カウンタ８の出力段にインバータを設けることが考
えられ、従って読み取１）指示信号Ｓｃおよびトップ信
号ｓｂを導入するデート回路はＡＮＤデーＦに限定され
ない。Note that depending on the output waveform from the read instruction count 8, an inverter may be provided at the output stage of the counter 8. Therefore, the date circuit that introduces the read 1) instruction signal Sc and top signal sb is not limited to the AND data F. .
〈発明の効果〉
以上のよ）に、本発明によれば、トップ信号か発生しな
い期間はトップ信号ラインの信号が遮断されるから、こ
の期間中に混入してくるあらゆる種類のノイズを除去す
ることができ、制御部においてトップ信号の正確な検出
が可能となる。そのため、トップ信号の誤検出による制
御不良を未然に防止し、吸排気弁の開閉や燃料噴射を所
要のタイミングで正確に動作させることがで外る。<Effects of the Invention> As described above, according to the present invention, the signal on the top signal line is cut off during the period when no top signal is generated, so all kinds of noise that enters during this period can be removed. This allows the control unit to accurately detect the top signal. Therefore, control failures due to erroneous detection of the top signal can be prevented, and the opening and closing of the intake and exhaust valves and fuel injection can be operated accurately at the required timing.
第１図は本発明の一実施例のブロック図、第２図は上記
実施例の動作を示すタイムチャートである。
ｌ・・・トップセンサ（トップ位置検出手段）、２・・
・回転角センサ（回転角検出手段）、３・・・ノイズ防
止回路、８・・・読み取り指示カウンタ、９・・・ＡＮ
Ｄゲート（ゲート回路）。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a time chart showing the operation of the embodiment. l...Top sensor (top position detection means), 2...
・Rotation angle sensor (rotation angle detection means), 3... Noise prevention circuit, 8... Reading instruction counter, 9... AN
D gate (gate circuit).
Claims (1)
る手段と、機関の回転角を検出して機関の１回転中に多
数の回転角信号を出力する手段と、前記回転角信号を一
定数カウントしてトップ信号の読み取り禁止期間に対応
する読み取り指示信号を出力する読み取り指示カウンタ
と、読み取り指示信号およびトップ信号を導入して、ノ
イズを除去したトップ信号である正常化トップ信号を出
力するゲート回路とを備えた機関のトップ信号検出装置
。(1) means for detecting the top position of the engine and outputting a top signal; means for detecting the rotation angle of the engine and outputting a large number of rotation angle signals during one rotation of the engine; A read instruction counter that counts a number of times and outputs a read instruction signal corresponding to the read prohibition period of the top signal, and a normalized top signal that is a top signal from which noise has been removed by introducing the read instruction signal and the top signal. Engine top signal detection device with gate circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14822984A JPS6125948A (en) | 1984-07-16 | 1984-07-16 | Top-signal detector for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14822984A JPS6125948A (en) | 1984-07-16 | 1984-07-16 | Top-signal detector for engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6125948A true JPS6125948A (en) | 1986-02-05 |
Family
ID=15448159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14822984A Pending JPS6125948A (en) | 1984-07-16 | 1984-07-16 | Top-signal detector for engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6125948A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2724416A1 (en) * | 1994-09-09 | 1996-03-15 | Renault | Fuel and/or ignition control for 4=stroke IC engine |
| TWI409385B (en) * | 2009-08-05 | 2013-09-21 | Mitsui Shipbuilding Eng | A reciprocating engine swivel number calculating device and a reciprocating engine control device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS582468A (en) * | 1981-06-30 | 1983-01-08 | Nec Home Electronics Ltd | Engine firing controller |
-
1984
- 1984-07-16 JP JP14822984A patent/JPS6125948A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS582468A (en) * | 1981-06-30 | 1983-01-08 | Nec Home Electronics Ltd | Engine firing controller |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2724416A1 (en) * | 1994-09-09 | 1996-03-15 | Renault | Fuel and/or ignition control for 4=stroke IC engine |
| TWI409385B (en) * | 2009-08-05 | 2013-09-21 | Mitsui Shipbuilding Eng | A reciprocating engine swivel number calculating device and a reciprocating engine control device |
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