JPS58140427A - Detector for upper dead point of engine - Google Patents
Detector for upper dead point of engineInfo
- Publication number
- JPS58140427A JPS58140427A JP2112582A JP2112582A JPS58140427A JP S58140427 A JPS58140427 A JP S58140427A JP 2112582 A JP2112582 A JP 2112582A JP 2112582 A JP2112582 A JP 2112582A JP S58140427 A JPS58140427 A JP S58140427A
- Authority
- JP
- Japan
- Prior art keywords
- discriminator
- oscillator
- engine
- output side
- change
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/06—Testing internal-combustion engines by monitoring positions of pistons or cranks
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、自動車、航空機等のエンジンの点火覇
時榛制御に詠９、符にマイクロ波を使用して、エンジン
のシリンダ内が象も圧縮された時、すなわち上死点の検
出に好適なエンジン上死点検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention uses microwaves to control the ignition rate of engines of automobiles, aircrafts, etc. when the inside of the engine cylinder is compressed. The present invention relates to an engine top dead center detection device suitable for detecting dead center.
従来の上死点検出方法は、クランク角から求める機械的
方法が一般的であり、クランク角が零となる点を上死点
と判定していた。しかしこの方法によると、クランク角
が零となる付近は、ピストンの上下動に対して角度のｗ
Ｉｈきが大きくなり、真にエンジンのシリンダ内が最も
圧縮された位置とクランク角を零と判定した位置とを正
確に一致させるのが困難でめった。このため、燃料に点
火した後、最高圧力に達した時点がクランク角の最適位
置と一致せず、発生出力の減退や燃料消費料の増大等の
悪影響を起すと同時にエンジン個々の性ｆｌバ５ンキを
大きくする欠点がめった。Conventional top dead center detection methods have generally been mechanical methods that determine from the crank angle, and the point where the crank angle is zero is determined to be the top dead center. However, according to this method, in the vicinity where the crank angle is zero, the angle w with respect to the vertical movement of the piston is
Ih became large, and it was difficult and difficult to accurately match the position where the engine cylinder was most compressed with the position where the crank angle was determined to be zero. For this reason, after the fuel is ignited, the point at which the maximum pressure is reached does not match the optimum position of the crank angle, causing negative effects such as a decrease in generated output and an increase in fuel consumption. The disadvantage of increasing the size is rare.
本発明の目的は、上記欠点を無くすため、電気的方法、
特にマイクロ波を使用して、エンジンのシリンダ内が蛾
も圧縮された上死点を正確に検出する手段を提供するこ
とにある。The object of the present invention is to eliminate the above-mentioned drawbacks by using an electrical method,
In particular, it is an object of the present invention to provide a means for accurately detecting the top dead center at which the cylinder of an engine is compressed, using microwaves.
本発明は、シリンダ内が金属壁で囲まれたマイクロ波帯
の空胴共振器となること及び上死点において該空胴共振
器の共振周波数が最高となることに着目し、上記空胴共
振器を結合し、該共振器の共振周波数で発振する発振器
と、該発振器の発振周波′ｔｉ変化を電圧変化に変換す
る弁別器と、電圧最大点の判定を容易にする微分回路と
によりエンジンの上死点を正確に検出することを特徴と
する。The present invention focuses on the fact that the inside of the cylinder is a microwave band cavity resonator surrounded by a metal wall, and that the resonant frequency of the cavity resonator is the highest at top dead center. An oscillator that oscillates at the resonant frequency of the resonator, a discriminator that converts changes in the oscillation frequency 'ti of the oscillator into changes in voltage, and a differentiation circuit that facilitates the determination of the maximum voltage point. It is characterized by accurately detecting top dead center.
以下、本発明の原理と実施例について詳細に説明する。Hereinafter, the principle and embodiments of the present invention will be explained in detail.
第１図は、本発明のエンジン上死点検出装置の構成ヲ示
すブロック図である。FIG. 1 is a block diagram showing the configuration of an engine top dead center detection device according to the present invention.
第１図の構成に２いて、１は、エンジンのシリンダ、２
はピストン、３は、削配シリンダおよびピスト／により
４１１成される受胴共振器部でめシ、鮎台ループ４によ
り発ａ＠Ｓと電磁界で結合している。発振器ｂＧ／）発
振は、上記空胴共振器の共振周ａ数又はそのｓ３調波周
波数で起る。このような発振回路としては、発掘器自体
に特定の共畿器をもたす、上記空胴共振器を共振回路と
し、＠襞発振を起すもの、友とえはトランジスタのベー
スに該仝胴共ｆｉｈを結合させたものなどがある。また
′１ ■
別の形式として、上記空胴共振器の共振周波数近傍で先
掘する発振器について、該空胴共振器と結合する線略の
長さを適当に選び引込みにより、発掘周波数を該空胴共
振器の共珈周波数に追促場せる方法がある。発振素子と
しては、マイクロ波帯で使用できる素子であれば良く、
トランジスタの他ＧａＡｌ”ＥＴやガンダイオード等が
ある。上記構成において、発掘周波数のクランク角θに
対する変化は、第２図に示すようになる。すなわち上死
点で空胴共振器３の体積は最小となり、もって共伽周波
数は最＾とな９、発掘周波数も取高値を示す。発掘器５
の出力側に、周波数変化を電圧変化に変換する弁別器６
を設け、クランク角に対する周波数変化を′＃１３図に
示すような電圧変化に変換する。この弁別器も一般に良
く知られており、たとえば、共振器の共振特性の鵠斜部
分を使用する方法などがめる。動作の詳細については公
知であるので省略する。次に弁別器６の出力側に微分回
路７ｔ−設け、電圧変化の曲線を第４因に示すような曲
線に変換し、周波数最大点を電圧の零クロス点で判定し
、もって空胴共振器の体積が最小となる上死点の正確な
検出が可能となる。In the configuration shown in FIG. 1, 1 is an engine cylinder, 2
is a piston, and 3 is a receiving body resonator section formed by a cutting cylinder and a piston/411, which is coupled to the generator a@S by an electromagnetic field through an Ayudai loop 4. Oscillator bG/) Oscillation occurs at the resonant frequency a of the cavity resonator or its s3 harmonic frequency. Such an oscillator circuit includes one in which the excavator itself has a specific resonator, one in which the cavity resonator described above is used as a resonant circuit to cause fold oscillation, and one in which the resonator is connected to the base of a transistor. There are some that combine common fih. As another method, for an oscillator that excavates in advance near the resonant frequency of the cavity resonator, the excavation frequency can be adjusted to the cavity by appropriately selecting the length of the wire connecting to the cavity resonator. There is a method of applying a follow-up field to the resonant frequency of the body resonator. The oscillation element may be any element that can be used in the microwave band.
In addition to transistors, there are GaAl"ET, Gunn diodes, etc. In the above configuration, the change in the excavation frequency with respect to the crank angle θ is as shown in Fig. 2. In other words, the volume of the cavity resonator 3 at the top dead center is the minimum. Therefore, the common frequency is the highest 9, and the excavation frequency also shows the transaction value. Excavator 5
A discriminator 6 that converts frequency changes into voltage changes is installed on the output side of
is provided to convert the frequency change with respect to the crank angle into a voltage change as shown in Figure 13. This discriminator is also generally well known, and includes, for example, a method that uses the cross section of the resonance characteristic of a resonator. The details of the operation are well known and will therefore be omitted. Next, a differentiating circuit 7t is provided on the output side of the discriminator 6, converting the voltage change curve into a curve as shown in the fourth factor, determining the maximum frequency point at the zero cross point of the voltage, and thereby It becomes possible to accurately detect the top dead center where the volume of is the minimum.
第５図は、さらに検出ｎ度を向上させるための回路構成
の一実施例でるる。図において、ミクサ９には、発掘器
５の出力と局発８の出力が同時に加わり、両者の差の周
波数を取り出し、中間周波増幅器１０により項一し′ｆ
ｃ恢、中間周波数で動作する弁別器１１に加える。上記
構成によれば、該弁別器の入力信号レベルが大１陽に１
９口するため、周波数変化に対する゛電圧レベルの変化
が大きくなり、もって上死点検出棺度の向上が可能とな
る。FIG. 5 shows an example of a circuit configuration for further improving the detection n degree. In the figure, the output of the excavator 5 and the output of the local oscillator 8 are simultaneously applied to the mixer 9, the difference frequency between the two is taken out, and the intermediate frequency amplifier 10 is used to equalize the difference.
c, and added to the discriminator 11 operating at an intermediate frequency. According to the above configuration, the input signal level of the discriminator is approximately 1
Since there are nine inputs, the change in the voltage level with respect to the frequency change becomes large, thereby making it possible to improve the accuracy of top dead center detection.
以上説明し友ごとく、本発明によれば、エンジン性能に
太きな［譬を侍る上死点をマイクロ波を用いた電気的＋
段により正確に検出できるエンジン上死点検出装置が実
現できる。As explained above, according to the present invention, the top dead center using microwaves can significantly improve engine performance.
It is possible to realize an engine top dead center detection device that can accurately detect the engine top dead center.
第１図は、本発明の構成を示すフロック図、第２図は、
クランクの角度に対する発振器の発振周波数変化を示す
因、第３図は、クランクの角度に対する弁別器の出力電
圧の変化を示す商、第４図は、クランクの角度に対する
微分回路出力電圧の変化を示す図、第５図は、本発明の
他の実施例。
ｌ・・・７リンダ、２・・・ピストン、３・・・受胴共
振器部、４・・・結合ループ、５・・・発掘器、６・・
・弁別器、７・・・微分回路、８・・・局発、９・・・
ミクサ、１０・・・ＩＦア°−゛−FIG. 1 is a block diagram showing the configuration of the present invention, and FIG. 2 is a block diagram showing the configuration of the present invention.
Figure 3 shows the change in the oscillation frequency of the oscillator with respect to the crank angle. Figure 3 shows the change in the output voltage of the discriminator with respect to the crank angle. Figure 4 shows the change in the differential circuit output voltage with respect to the crank angle. FIG. 5 shows another embodiment of the present invention. l... 7 cylinder, 2... piston, 3... receiver body resonator section, 4... coupling loop, 5... excavator, 6...
・Discriminator, 7... Differential circuit, 8... Local oscillator, 9...
Mixer, 10...IF a °-゛-
Claims (1)
器と、該発＃Ｒ器の出力側に周波数変化を電圧変化に変
侠する弁別器と弁別器の出力側に倣分（ロ）路を設けた
ことを特徴とするエンジン上死点検出装置。 ２、特許請求の範ｖ５第１項記載のエンジン回転角検出
装置において、上記発振器の出力側に、ミクサと局部発
振器と中間周波増幅器および中間周波数帯で動作する弁
別器を設けたことを特徴とするエンジン上死点検出装置
。[Scope of Claims] 1. An excavator that connects with the space inside Ennon's cylinder by an electromagnetic field, a discriminator that converts a frequency change into a voltage change on the output side of the generator, and an output side of the discriminator that converts a frequency change into a voltage change. An engine top dead center detection device characterized by providing a tracing branch (b) path. 2. The engine rotation angle detection device according to claim v5 (1), characterized in that a mixer, a local oscillator, an intermediate frequency amplifier, and a discriminator operating in an intermediate frequency band are provided on the output side of the oscillator. Engine top dead center detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2112582A JPS58140427A (en) | 1982-02-15 | 1982-02-15 | Detector for upper dead point of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2112582A JPS58140427A (en) | 1982-02-15 | 1982-02-15 | Detector for upper dead point of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58140427A true JPS58140427A (en) | 1983-08-20 |
Family
ID=12046161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2112582A Pending JPS58140427A (en) | 1982-02-15 | 1982-02-15 | Detector for upper dead point of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58140427A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010156714A (en) * | 1997-07-31 | 2010-07-15 | Astyx Gmbh | Distance measuring device and method for measuring distance |
-
1982
- 1982-02-15 JP JP2112582A patent/JPS58140427A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010156714A (en) * | 1997-07-31 | 2010-07-15 | Astyx Gmbh | Distance measuring device and method for measuring distance |
| JP2014238411A (en) * | 1997-07-31 | 2014-12-18 | アスティックス ゲーエムベーハー | Distance measuring instrument and method for measuring distance |
| JP2015007644A (en) * | 1997-07-31 | 2015-01-15 | アスティックス ゲーエムベーハー | Distance measurement device and method for measuring distance |
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