JPH0222325B2 - - Google Patents

Info

Publication number
JPH0222325B2
JPH0222325B2 JP56027862A JP2786281A JPH0222325B2 JP H0222325 B2 JPH0222325 B2 JP H0222325B2 JP 56027862 A JP56027862 A JP 56027862A JP 2786281 A JP2786281 A JP 2786281A JP H0222325 B2 JPH0222325 B2 JP H0222325B2
Authority
JP
Japan
Prior art keywords
cylinder
pressure
water chamber
knocking
water
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.)
Expired - Lifetime
Application number
JP56027862A
Other languages
Japanese (ja)
Other versions
JPS57142536A (en
Inventor
Jujiro Ooshima
Nahokazu Asai
Hiroji Tokoro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Central R&D Labs Inc
Original Assignee
Toyota Central R&D Labs Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Central R&D Labs Inc filed Critical Toyota Central R&D Labs Inc
Priority to JP2786281A priority Critical patent/JPS57142536A/en
Priority to US06/326,524 priority patent/US4483179A/en
Publication of JPS57142536A publication Critical patent/JPS57142536A/en
Publication of JPH0222325B2 publication Critical patent/JPH0222325B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/222Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Testing Of Engines (AREA)

Description

【発明の詳細な説明】 本発明は、水冷式内燃機関のノツキングを検出
する装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting knocking in a water-cooled internal combustion engine.

本発明者は、以前に、内燃機関におけるノツキ
ングの検出精度を高めるため、水冷式内燃機関の
エンジンブロツクの振動について研究したとこ
ろ、燃焼室内にノツキングが発生すると、燃焼室
と水室間のシリンダが燃焼室内のノツキングによ
る圧力振動に応じた周波数で振動し、その振動に
よつて水室の容積が増減して、水室内の冷却水に
圧力変化が生じ、一方、ノツキング以外の振動に
よつては水室内の冷却水にはノツキングによる振
動周波数成分を含む圧力変化がほとんど生じない
ことを知得した。そして、この研究結果に基き、
燃焼室内のノツキングによりシリンダを介して冷
却水の圧力変化が生ずる水室に、その圧力変化を
検出する圧力計を接続したことを特徴とするノツ
キング検出装置を発明したのである。ところが、
このノツキング検出装置は、それ以前のものより
はノツキングの検出精度が高いが、しかし、また
充分なものとは言い難い。
In order to improve the accuracy of knocking detection in internal combustion engines, the present inventor previously researched vibrations in the engine block of a water-cooled internal combustion engine, and found that when knocking occurs in the combustion chamber, the cylinder between the combustion chamber and the water chamber It vibrates at a frequency corresponding to the pressure vibration caused by knocking in the combustion chamber, and the volume of the water chamber increases or decreases due to the vibration, causing a pressure change in the cooling water in the water chamber.On the other hand, vibrations other than knocking cause We learned that pressure changes including vibration frequency components due to knocking hardly occur in the cooling water in the water chamber. Based on the results of this research,
He invented a knocking detection device characterized in that a pressure gauge for detecting pressure changes is connected to a water chamber in which pressure changes in cooling water occur via a cylinder due to knocking in the combustion chamber. However,
Although this knocking detection device has higher accuracy in detecting knocking than previous devices, it is still not sufficient.

本発明の目的は、水冷式内燃機関におけるノツ
キングの検出精度が更に高いノツキング検出装置
を提供することである。
An object of the present invention is to provide a knocking detection device that can detect knocking in a water-cooled internal combustion engine with higher accuracy.

本発明者は、上記の目的を達成するため、水冷
式の内燃機関において、燃焼室内のノツキングに
よつて水室内の冷却水に圧力変化が生ずる様子を
詳細に研究したところ、次のようなことを知得し
た。
In order to achieve the above object, the present inventor conducted a detailed study on how pressure changes occur in the cooling water in the water chamber due to knocking in the combustion chamber in a water-cooled internal combustion engine, and found the following. learned.

(1) 燃焼室内にノツキングが発生すると、燃焼室
内を摺動するピストンの頂面が振動し、ピスト
ンが上死点通過後の膨張行程時にスラツプによ
つてシリンダの一側に打ち付けられて押し付け
られると、ピストンが押し付けられたシリンダ
のスラスト側にはピストン頂面の振動が伝わ
り、シリンダのスラスト側は燃焼室内のノツキ
ングによる圧力振動に応じた周波数で大きく振
動して歪を発生し、シリンダのスラスト側に接
する水室内の冷却水には大きな圧力変化が生ず
る。
(1) When knocking occurs in the combustion chamber, the top surface of the piston sliding inside the combustion chamber vibrates, and the piston is struck and pressed against one side of the cylinder by slap during the expansion stroke after passing through top dead center. Then, the vibration of the top surface of the piston is transmitted to the thrust side of the cylinder against which the piston is pressed, and the thrust side of the cylinder vibrates greatly at a frequency corresponding to the pressure vibration caused by knotting in the combustion chamber, causing distortion. A large pressure change occurs in the cooling water in the water chamber adjacent to the side.

なお、ノツキングが大きくてピストン頂面の
振動が大きい場合は、シリンダはスラスト側の
みならず反スラスト側を含めた全周で振動す
る。
Note that if the knocking is large and the vibration of the top surface of the piston is large, the cylinder will vibrate not only on the thrust side but also on the entire circumference including the anti-thrust side.

(2) 一方、ノツキングが発生する膨張行程時にピ
ストンが打ち付けられないシリンダの反スラス
ト側にはノツキングによつて生じたピストン頂
面の振動が直接的には伝わらず、シリンダの反
スラスト側はスラスト側程には大きく振動せ
ず、従つて、シリンダの反スラスト側に接する
水室内の冷却水にはスラスト側に接する水室内
の冷却水程には大きな圧力変化が生じない。
(2) On the other hand, the vibration of the piston top surface caused by notching is not directly transmitted to the anti-thrust side of the cylinder, where the piston does not strike during the expansion stroke where knocking occurs, and the anti-thrust side of the cylinder Therefore, the cooling water in the water chamber in contact with the anti-thrust side of the cylinder does not vibrate as much as the cooling water in the water chamber in contact with the thrust side.

(3) また、ノツキングによるシリンダの歪振動に
よつて発生する水室内の冷却水の圧力振動波
は、周波数が約6〜10KHzと高く、これより低
い周波数の圧力振動波に比して直進性が高い。
(3) In addition, the pressure vibration waves of the cooling water in the water chamber generated by the strain vibration of the cylinder due to knocking have a high frequency of approximately 6 to 10 KHz, and are more linear than pressure vibration waves with lower frequencies. is high.

本発明は、上記の第1項と第2項の研究結果に
基いて完成したものである。
The present invention has been completed based on the research results in the above-mentioned sections 1 and 2.

即ち、シリンダ内に、ピストンが摺動する燃焼
室を形成し、ピストンが上死点通過後の膨張行程
時にスラツプによつてシリンダの一側に打ち付け
られて押し付けられる構成にし、シリンダ外に、
冷却水が流通する水室を形成した水冷式の内燃機
関において、 燃焼室内のノツキングによりシリンダを介して
水室内に生ずる冷却水の圧力変化を検出する圧力
計を、ピストンが上死点通過後の膨張行程時にス
ラツプによつて打ち付けられて押し付けられるシ
リンダのスラスト側の水室に接続したことを特徴
とするノツキング検出装置である。
That is, a combustion chamber in which a piston slides is formed within the cylinder, and the piston is struck and pressed against one side of the cylinder by a slap during the expansion stroke after passing through top dead center, and the piston is pressed against one side of the cylinder by a slap.
In a water-cooled internal combustion engine that has a water chamber through which cooling water flows, a pressure gauge that detects changes in the pressure of the cooling water that occur in the water chamber through the cylinder due to knocking in the combustion chamber is installed after the piston passes through top dead center. This knocking detection device is characterized in that it is connected to a water chamber on the thrust side of the cylinder that is struck and pressed by a slap during the expansion stroke.

このノツキング検出装置は、ノツキングによる
冷却水の圧力変化を検出する圧力計を、上記の第
1項と第2項の研究結果から明らかなように、ノ
ツキングによる冷却水の圧力変化が大きくなる側
の水室に接続しているので、その反対側の水室に
接続した場合に比して、ノツキングの検出精度が
高い。
This knocking detection device uses a pressure gauge that detects changes in cooling water pressure due to knocking to detect pressure changes on the side where the pressure change in cooling water due to knocking increases, as is clear from the research results in Sections 1 and 2 above. Since it is connected to the water chamber, knocking detection accuracy is higher than when connected to the water chamber on the opposite side.

本発明の実施態様は、上記の第3項の研究結果
に基いて完成したものである。
The embodiments of the present invention have been completed based on the research results in Section 3 above.

即ち、本発明の内燃機関のノツキング検出装置
において、上記の圧力計の受圧部を、上記のシリ
ンダのスラスト側の水室の壁面より水室内の冷却
水中に突出したことを特徴とするノツキング検出
装置である。
That is, in the knocking detection device for an internal combustion engine according to the present invention, the pressure receiving part of the pressure gauge is protruded from the wall surface of the water chamber on the thrust side of the cylinder into the cooling water in the water chamber. It is.

このノツキング検出装置は、ノツキングによる
冷却水の圧力変化を検出する圧力計の受圧部を水
室壁面より水室内の冷却水中に突出しているの
で、前記の第3項の研究結果から明らかなように
直進性の強いノツキングによる冷却水の圧力振動
波を圧力計の受圧部で感度よく検出することがで
き、圧力計の受圧部を水室壁面より水室内の冷却
水中に突出していない場合に比して、ノツキング
の検出精度が高い。また、圧力計の受圧部が水室
内の冷却水によつて冷却されるので、内燃機関周
辺の温度が高くなつても、圧力計の受圧部が冷却
水の温度より高温に加熱されることがない。
In this knocking detection device, the pressure receiving part of the pressure gauge that detects the pressure change of the cooling water due to knocking protrudes from the water chamber wall surface into the cooling water in the water chamber. The pressure oscillation waves of the cooling water caused by knocking, which travels in a straight line, can be detected with high sensitivity at the pressure receiving part of the pressure gauge, compared to when the pressure receiving part of the pressure gauge does not protrude from the water chamber wall surface into the cooling water in the water chamber. Therefore, the detection accuracy of knocking is high. In addition, since the pressure receiving part of the pressure gauge is cooled by the cooling water in the water chamber, even if the temperature around the internal combustion engine becomes high, the pressure receiving part of the pressure gauge will not be heated to a higher temperature than the temperature of the cooling water. do not have.

本発明の他の実施態様は、本発明の内燃機関の
ノツキング検出装置において、上記の圧力計の受
圧部を、上記のシリンダのスラスト側の水室の壁
面に形成した開口径が深さ以上の大きさの取付凹
部に取付けたことを特徴とするノツキング検出装
置である。
Another embodiment of the present invention is the knocking detection device for an internal combustion engine according to the present invention, in which the pressure receiving part of the pressure gauge is formed on the wall surface of the water chamber on the thrust side of the cylinder, and the diameter of the opening is greater than or equal to the depth. This is a knocking detection device characterized in that it is mounted in a mounting recess of the same size.

このノツキング検出装置は、水室壁面に形成し
た取付凹部に圧力計の受圧部を取付けているの
で、シリンダと水室壁面間の水室が狭く、その水
室内の冷却水中に圧力計の受圧部を突出すること
ができない場合にも、圧力計の受圧部を水室内の
冷却水中に突出して取付けることができる。ま
た、圧力計の受圧部を取付けた取付凹部は開口径
が深さ以上に大きいので、取付凹部内にノツキン
グによる直進性の強い冷却水の圧力振動波が侵入
し易く、ノツキングによる冷却水の圧力振動波を
圧力計の受圧部で感度よく検出することができ
る。結局、シリンダと水室壁面間の水室が圧力計
の受圧部を突出するのには狭すぎる場合にも、圧
力計の受圧部を水室内の冷却水中に突出してノツ
キングの検出精度を高めることができると共に、
圧力計の受圧部を水室内の冷却水によつて冷却す
ることができる。
In this knocking detection device, the pressure receiving part of the pressure gauge is installed in the mounting recess formed in the wall of the water chamber, so the water chamber between the cylinder and the wall of the water chamber is narrow, and the pressure receiving part of the pressure gauge is placed in the cooling water in the water chamber. Even if it is not possible to protrude the pressure gauge, the pressure receiving part of the pressure gauge can be installed so as to protrude into the cooling water in the water chamber. In addition, since the opening diameter of the mounting recess where the pressure receiving part of the pressure gauge is mounted is larger than the depth, pressure vibration waves of the cooling water that travel in a straight line due to knotting can easily enter the mounting recess, and the pressure of the cooling water due to knotting can easily enter the mounting recess. Vibration waves can be detected with high sensitivity by the pressure receiving part of the pressure gauge. After all, even if the water chamber between the cylinder and the water chamber wall is too narrow for the pressure receiving part of the pressure gauge to protrude, the pressure receiving part of the pressure gauge can be protruded into the cooling water in the water chamber to improve the accuracy of knocking detection. Along with being able to
The pressure receiving part of the pressure gauge can be cooled by cooling water in the water chamber.

次に、本発明の実施例について説明する。 Next, examples of the present invention will be described.

第1実施例(第1図乃至第4図参照) 本例のノツキング検出装置を取付ける水冷式の
内燃機関は、第1図と第2図に示すように、4個
のシリンダ2を直列型に配置した自動車用のガソ
リンエンジンであり、各シリンダ2内にそれぞれ
ピストン5を摺嵌した燃焼室1を形成し、各シリ
ンダ2の外回りに冷却水が流通する水室3を形成
したシリンダブロツクの上に、図示しない吸気弁
と排気弁及び水室を備えたシリンダヘツド8を結
合し、シリンダブロツクの下側にクランク軸7を
軸支したクランク室を形成し、クランク軸7の各
クランクピンと各ピストン5のピストンピンをそ
れぞれ連結棒6で連結している。
First Embodiment (See Figures 1 to 4) A water-cooled internal combustion engine to which the knocking detection device of this example is installed has four cylinders 2 arranged in series, as shown in Figures 1 and 2. This is a gasoline engine for automobiles arranged on a cylinder block in which a combustion chamber 1 with a piston 5 slidably fitted into each cylinder 2 is formed, and a water chamber 3 through which cooling water flows around the outside of each cylinder 2 is formed. A cylinder head 8 equipped with an intake valve, an exhaust valve, and a water chamber (not shown) is combined to form a crank chamber in which the crankshaft 7 is pivotally supported on the lower side of the cylinder block, and each crank pin of the crankshaft 7 and each piston are connected to each other. 5 piston pins are connected by connecting rods 6, respectively.

本例のノツキング検出装置は、上記エンジンの
膨張行程時にピストン5がスラツプによつて打ち
付けられて押し付けられるシリンダ2のスラスト
側の水室3壁即ちシリンダブロツク外周壁4の中
央部にその外周壁とシリンダ2間の水室3に連通
する螺孔の検出孔9を貫設し、検出孔9に圧力計
10のボルト状取付部11を螺合して緊締し、検
出孔9を圧力計10で閉鎖する一方、圧力計のボ
ルト状取付部11をシリンダブロツク外周壁4に
取付け、ボルト状取付部11の先端に突設した受
圧部13を水室3壁面即ちシリンダブロツク外周
壁4面より水室3内に突出して水室内の冷却水中
に突出している。
The knocking detection device of this embodiment is designed to connect the outer circumferential wall to the wall of the water chamber 3 on the thrust side of the cylinder 2, that is, the central part of the outer circumferential wall 4 of the cylinder block, against which the piston 5 is struck and pressed by the slap during the expansion stroke of the engine. A screw detection hole 9 communicating with the water chamber 3 between the cylinders 2 is provided through the cylinder 2, and a bolt-shaped mounting portion 11 of a pressure gauge 10 is screwed into the detection hole 9 and tightened. On the other hand, the bolt-shaped mounting part 11 of the pressure gauge is mounted on the outer peripheral wall 4 of the cylinder block, and the pressure receiving part 13 protruding from the tip of the bolt-shaped mounting part 11 is inserted into the water chamber from the wall surface of the water chamber 3, that is, the outer peripheral wall 4 surface of the cylinder block. 3 and protrudes into the cooling water in the water chamber.

上記の圧力計10は、第3図と第4図に示すよ
うに、ボルト状取付部11の先端面に突設した柄
14の先端を枠筒15の周壁に貫設した接続孔に
嵌着して、短円筒状の枠筒15をボルド状の取付
部11の先端に突設し、枠筒15の両開口端にそ
れぞれ受圧膜16を被覆し、枠筒15内に同軸芯
に配置した歪管17を両受圧膜16,16で挾持
し、両受圧膜16,16に加わる圧力によつて歪
が生ずる歪管17の外周面に歪ゲーム18を貼着
して、受圧部13を構成し、歪ゲージ18のリー
ド線19を取付部11に貫設した中心孔12を経
て外部に導出している。
As shown in FIGS. 3 and 4, the pressure gauge 10 described above is constructed by fitting the tip of a handle 14 protruding from the tip of a bolt-like mounting portion 11 into a connecting hole penetrating the peripheral wall of a frame tube 15. Then, a short cylindrical frame 15 was provided protrudingly at the tip of the bolt-shaped mounting part 11, and both open ends of the frame 15 were coated with pressure receiving membranes 16, which were arranged coaxially within the frame 15. The pressure receiving section 13 is constructed by sandwiching the strain tube 17 between both pressure receiving membranes 16, 16, and pasting a strain game 18 on the outer circumferential surface of the strain tube 17, where distortion occurs due to the pressure applied to both the pressure receiving membranes 16, 16. A lead wire 19 of the strain gauge 18 is guided to the outside through a central hole 12 extending through the mounting portion 11.

水冷式の4気筒ガソリンエンジンに装置した本
例のノツキング検出装置においては、燃焼室1で
ノツキングが発生すると、そのノツキングにより
燃焼室1内を摺動するピストン5の頂面が振動
し、そのピストン5が上死点通過後の膨張行程時
にスラツプによつてシリンダ2に打ち付けられ、
ピストン5が押し付けられたシリンダ2のスラス
ト側が大きく振動し、そのスラスト側に接する水
室3内の冷却水に大きな圧力変化が生じ、その大
きな圧力変化が圧力計の受圧膜16,16に加つ
て、歪管17に歪が生じ、その歪が歪ゲージ18
によつて検出され、結局、ノツキングの発生が検
出される。
In the knocking detection device of this example installed in a water-cooled four-cylinder gasoline engine, when knocking occurs in the combustion chamber 1, the knocking causes the top surface of the piston 5 sliding in the combustion chamber 1 to vibrate, causing the piston to vibrate. 5 is struck against the cylinder 2 by a slap during the expansion stroke after passing the top dead center,
The thrust side of the cylinder 2 against which the piston 5 is pressed vibrates greatly, causing a large pressure change in the cooling water in the water chamber 3 that is in contact with the thrust side, and this large pressure change is added to the pressure receiving membranes 16, 16 of the pressure gauge. , strain occurs in the strain tube 17, and the strain is transmitted to the strain gauge 18.
As a result, the occurrence of knocking is detected.

本例のノツキング検出装置は、圧力計10をノ
ツキングによる冷却水の圧力変化が大きくなる側
の水室3に接続し、かつ、圧力計の受圧部13を
水室壁面より水室3内の冷却水中に突出している
ので、ノツキングの検出精度が高い。例えば、圧
力計10に近接した中央部の両燃焼室1,1で生
じたノツキングのみならず、圧力計10から最も
離れた両端位置の燃焼室1,1で生じたノツキン
グをも正確に検出する。
The knocking detection device of this example connects the pressure gauge 10 to the water chamber 3 on the side where the pressure change of the cooling water due to knocking increases, and also connects the pressure receiving part 13 of the pressure gauge to the cooling water chamber 3 from the wall surface of the water chamber. Since it protrudes into the water, the detection accuracy of knotting is high. For example, not only the knocking that occurs in both combustion chambers 1, 1 in the center near the pressure gauge 10, but also the knocking that occurs in the combustion chambers 1, 1 at the ends farthest from the pressure gauge 10 can be accurately detected. .

また、本例のノツキング検出装置は、圧力計の
受圧部13を水室3内の冷却水中に突出している
ので、圧力計の受圧部13が水室3内の冷却水に
よつて冷却され、エンジン周辺の温度が高くなつ
ても、受圧部13が冷却水の温度より高温に加熱
されることがない。
Furthermore, in the knocking detection device of this example, since the pressure receiving part 13 of the pressure gauge protrudes into the cooling water in the water chamber 3, the pressure receiving part 13 of the pressure gauge is cooled by the cooling water in the water chamber 3. Even if the temperature around the engine increases, the pressure receiving part 13 will not be heated to a higher temperature than the cooling water temperature.

第2実施例 (第5図参照) 本例のノツキング検出装置は、前例のそれと比
較すると、圧力計を装置するエンジンが水冷式の
2気筒又は3気筒ガソリンエンジンであり、圧力
計に圧電素子を利用した圧力計22を用い、その
圧力計の受圧板25を水室壁面と同一面に配置し
て水室3内の冷却水中に突出していない点のみが
相違し、その他の点は第1実施例のそれと同一で
ある。即ち、本例のノツキング検出装置は、エン
ジンの膨張行程時にピストンがスラツプによつて
打ち付けられるシリンダのスラスト側の水室3壁
即ちシリンダブロツク外周壁4の中央部にその外
周壁とシリンダ間の水室3に連通する螺孔の検出
孔9を貫設し、検出孔9に圧力計22のハウジン
グ23の先端取付螺歯部24を座金21を介して
螺合して緊締し、検出孔9を圧力計22で閉鎖す
る一方、圧力計22をシリンダブロツク外周壁4
に取付け、圧力計22の先端の受圧板25表面を
外周壁4内面に合致させて水室3内の冷却水と接
触させている。水室3に接続した上記の圧力計2
2は、ハウジング先端の受圧板25裏面に接した
圧力伝達部材26とハウジング内に支持した基板
27の間に、電極29を挾持した2個の圧電素子
28,28を装置し、電極29に接続したターミ
ナル30をハウジング23の後端開口部に螺着し
たコネクタ31内に突出している。
Second Embodiment (See Figure 5) Compared to the previous example, the knocking detection device of this example uses a water-cooled two-cylinder or three-cylinder gasoline engine that is equipped with a pressure gauge, and a piezoelectric element is installed in the pressure gauge. The only difference is that the pressure gauge 22 used is used, and the pressure receiving plate 25 of the pressure gauge is placed on the same plane as the water chamber wall surface and does not protrude into the cooling water in the water chamber 3.Other points are the same as in the first embodiment. It is the same as the example. That is, the knocking detection device of this embodiment detects water between the outer circumferential wall and the cylinder at the center of the wall of the water chamber 3 on the thrust side of the cylinder, that is, the outer circumferential wall 4 of the cylinder block, where the piston is struck by the slap during the expansion stroke of the engine. A screw detection hole 9 that communicates with the chamber 3 is provided through the detection hole 9, and the tip attachment threaded portion 24 of the housing 23 of the pressure gauge 22 is screwed into the detection hole 9 via a washer 21 to tighten the detection hole 9. While the pressure gauge 22 is closed, the pressure gauge 22 is connected to the outer circumferential wall 4 of the cylinder block.
The surface of the pressure receiving plate 25 at the tip of the pressure gauge 22 is aligned with the inner surface of the outer peripheral wall 4 and brought into contact with the cooling water in the water chamber 3. Above pressure gauge 2 connected to water chamber 3
2, two piezoelectric elements 28, 28 with an electrode 29 sandwiched between a pressure transmitting member 26 in contact with the back surface of the pressure receiving plate 25 at the tip of the housing and a substrate 27 supported in the housing are connected to the electrode 29. The terminal 30 protrudes into a connector 31 screwed into the rear end opening of the housing 23.

本例のノツキング検出装置においては、燃焼室
でノツキングが発生すると、そのノツキングによ
りシリンダを介して水室3内の冷却水に大きな圧
力変化が生じ、その圧力変化が圧力計の受圧板2
5に受圧され、圧力伝達部材26を介して圧電素
子28,28が押圧され、圧電素子28,28の
出力電圧が電極29からターミナル30に出力す
る。
In the knocking detection device of this example, when knocking occurs in the combustion chamber, the knocking causes a large pressure change in the cooling water in the water chamber 3 through the cylinder, and this pressure change is transmitted to the pressure receiving plate 2 of the pressure gauge.
5, the piezoelectric elements 28, 28 are pressed through the pressure transmission member 26, and the output voltage of the piezoelectric elements 28, 28 is output from the electrode 29 to the terminal 30.

本例のノツキング検出装置は、圧力計22をノ
ツキングによる冷却水の圧力変化が大きくなる側
の水室3に接続しているので、ノツキングの検出
精度が高い。また、圧力計の受圧板25を水室3
内の冷却水中に突出していないが、エンジンが2
気筒又は3気筒の少数気筒のエンジンであつて、
圧力計の受圧板25から各燃焼室までの距離が短
いので、各燃焼室で生じたノツキングを水室3内
の冷却水中に受圧板25が突出していない圧力計
22で充分に検出することができる。
The knocking detection device of this embodiment has high knocking detection accuracy because the pressure gauge 22 is connected to the water chamber 3 on the side where the pressure change of the cooling water due to knocking is large. In addition, the pressure receiving plate 25 of the pressure gauge is connected to the water chamber 3.
Although the engine does not protrude into the cooling water inside the
An engine with a small number of cylinders or three cylinders,
Since the distance from the pressure receiving plate 25 of the pressure gauge to each combustion chamber is short, knocking occurring in each combustion chamber cannot be sufficiently detected by the pressure gauge 22 in which the pressure receiving plate 25 does not protrude into the cooling water in the water chamber 3. can.

第3実施例 (第6図参照) 本例のノツキング検出装置は、水冷式の直列型
4気筒ガソリンエンジンの膨張行程時にピストン
5がスラツプによつて打ち付けられるシリンダ2
のスラスト側の水室3壁面即ちシリンダブロツク
外周壁4内面の中央部に開口径Dが深さL以上に
大きい円錐台状の取付凹部41を形成し、その取
付凹部41の底板42に第1実施例におけるのと
同様な圧力計10を第1実施例におけるのと同様
にして取付けたものである。第1実施例における
のと同様な部分には第6図に同一符号を付してそ
の説明を省略する。
Third Embodiment (Refer to Fig. 6) The knocking detection device of this embodiment is applied to a cylinder 2 against which a piston 5 is struck by a slap during the expansion stroke of a water-cooled in-line four-cylinder gasoline engine.
A truncated conical mounting recess 41 with an opening diameter D larger than the depth L is formed in the center of the wall surface of the water chamber 3 on the thrust side, that is, the inner surface of the outer circumferential wall 4 of the cylinder block. A pressure gauge 10 similar to that in the embodiment is attached in the same manner as in the first embodiment. Components similar to those in the first embodiment are designated by the same reference numerals in FIG. 6, and their explanation will be omitted.

本例のノツキング検出装置は、水室3壁面に形
成した取付凹部41に圧力計の受圧部13を取付
けているので、水室3が圧力計の受圧部13を突
出するのには狭すぎる場合にも、圧力計の受圧部
13を水室3内の冷却水中に突出して取付けるこ
とができる。また、取付凹部41は開口径Dが深
さL以上に大きいので、取付凹部41内にノツキ
ングによる直進性の強い冷却水の圧力振動波が侵
入し易く、ノツキングによる冷却水の圧力振動波
を取付凹部41内の圧力計の受圧部13で感度よ
く検出することができる。また、圧力計10を取
付けた取付凹部の底板42は水室3壁即ちシリン
ダブロツク外周壁4より狭くて固有振動数が高
く、その固有振動数がノツキングによる振動数か
ら大きく離れているので、取付凹部の底板42に
取付けた圧力計10に感知されるノイズが第1、
第2実施例におけるようにシリンダブロツク外周
壁4に取付けた圧力計に感知されるノイズより少
ない。
In the knocking detection device of this example, the pressure receiving part 13 of the pressure gauge is attached to the mounting recess 41 formed on the wall surface of the water chamber 3, so if the water chamber 3 is too narrow for the pressure receiving part 13 of the pressure gauge to protrude, Also, the pressure receiving part 13 of the pressure gauge can be installed so as to protrude into the cooling water in the water chamber 3. In addition, since the opening diameter D of the mounting recess 41 is larger than the depth L, the pressure vibration waves of the cooling water that travels in a straight line due to knotting are likely to enter into the mounting recess 41, and the pressure vibration waves of the cooling water due to knotting are easily penetrated into the mounting recess 41. The pressure receiving part 13 of the pressure gauge in the recess 41 can detect the pressure with high sensitivity. In addition, the bottom plate 42 of the mounting recess to which the pressure gauge 10 is mounted is narrower than the water chamber 3 wall, that is, the outer peripheral wall 4 of the cylinder block, and has a higher natural frequency. The first noise is the noise detected by the pressure gauge 10 attached to the bottom plate 42 of the recess.
This is less noise than that detected by the pressure gauge attached to the outer circumferential wall 4 of the cylinder block as in the second embodiment.

なお、取付凹部41の開口の形状が円形でない
場合には、その非円形開口と等しい面積を有する
円形開口の径を開口径Dとする。
In addition, when the shape of the opening of the attachment recess 41 is not circular, the diameter of a circular opening having the same area as the non-circular opening is defined as the opening diameter D.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の第1実施例のノツキング検出
装置の横断面図、第2図は第1図のA−A線断面
図、第3図は同例のノツキング検出装置の圧力計
取付部の一部破断拡大平面図、第4図は第3図の
B−B線断面図であり、第5図は本発明の第2実
施例のノツキング検出装置の圧力計取付部の一部
破断平面図であり、第6図は本発明の第3実施例
のノツキング検装置の圧力計取付部の横断面図で
ある。 1:燃焼室、2:シリンダ、3:水室、4:水
室3壁、シリンダブロツク外周壁、5:ピスト
ン、10:圧力計、13:受圧部、22:圧力
計、41:取付凹部、D:開口径、L:深さ。
FIG. 1 is a cross-sectional view of a knocking detection device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a pressure gauge mounting part of a knocking detection device of the same example. 4 is a partially broken enlarged plan view of FIG. 3, and FIG. 5 is a partially broken plan view of the pressure gauge mounting part of the knocking detection device according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view of a pressure gauge mounting portion of a knocking detection device according to a third embodiment of the present invention. 1: Combustion chamber, 2: Cylinder, 3: Water chamber, 4: Water chamber 3 wall, cylinder block outer peripheral wall, 5: Piston, 10: Pressure gauge, 13: Pressure receiver, 22: Pressure gauge, 41: Mounting recess, D: opening diameter, L: depth.

Claims (1)

【特許請求の範囲】 1 シリンダ内に、ピストンが摺動する燃焼室を
形成し、ピストンが上死点通過後の膨張行程時に
スラツプによつてシリンダの一側に打ち付けられ
て押し付けられる構成にし、シリンダ外に、冷却
水が流通する水室を形成した水冷式の内燃機関に
おいて、 燃焼室内のノツキングによりシリンダを介して
水室内に生ずる冷却水の圧力変化を検出する圧力
計を、ピストンが上死点通過後の膨張行程時にス
ラツプによつて打ち付けられて押し付けられるシ
リンダのスラスト側の水室に接続したことを特徴
とするノツキング検出装置。 2 上記の圧力計の受圧部を、上記のシリンダの
スラスト側の水室の壁面より水室内の冷却水中に
突出したことを特徴とする特許請求の範囲第1項
記載のノツキング検出装置。 3 上記の圧力計の受圧部を、上記のシリンダの
スラスト側の水室の壁面に形成した開口径が深さ
以上の大きさの取付凹部に取付けたことを特徴と
する特許請求の範囲第1項又は第2項記載のノツ
キング検出装置。
[Claims] 1. A combustion chamber in which a piston slides is formed in the cylinder, and the piston is struck and pressed against one side of the cylinder by a slap during the expansion stroke after passing the top dead center, In a water-cooled internal combustion engine that has a water chamber outside the cylinder through which cooling water flows, a pressure gauge that detects changes in the pressure of the cooling water that occur in the water chamber through the cylinder due to knocking in the combustion chamber is connected to the piston. 1. A knocking detection device, characterized in that the knocking detection device is connected to a water chamber on the thrust side of a cylinder that is struck and pressed by a slap during an expansion stroke after passing through a point. 2. The knocking detection device according to claim 1, wherein the pressure receiving part of the pressure gauge protrudes from the wall surface of the water chamber on the thrust side of the cylinder into the cooling water in the water chamber. 3. Claim 1, characterized in that the pressure receiving part of the pressure gauge is mounted in a mounting recess formed in the wall surface of the water chamber on the thrust side of the cylinder, the opening diameter of which is larger than the depth. The knocking detection device according to item 1 or 2.
JP2786281A 1980-12-03 1981-02-27 Detector for knocking of internal combustion engine Granted JPS57142536A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2786281A JPS57142536A (en) 1981-02-27 1981-02-27 Detector for knocking of internal combustion engine
US06/326,524 US4483179A (en) 1980-12-03 1981-12-02 Method of and device for detection of knocking for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2786281A JPS57142536A (en) 1981-02-27 1981-02-27 Detector for knocking of internal combustion engine

Publications (2)

Publication Number Publication Date
JPS57142536A JPS57142536A (en) 1982-09-03
JPH0222325B2 true JPH0222325B2 (en) 1990-05-18

Family

ID=12232713

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2786281A Granted JPS57142536A (en) 1980-12-03 1981-02-27 Detector for knocking of internal combustion engine

Country Status (1)

Country Link
JP (1) JPS57142536A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0719335U (en) * 1992-01-17 1995-04-07 出川 光代 Efficiency hat

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3584070D1 (en) * 1984-10-26 1991-10-17 Texas Instruments Inc CYLINDER PRESSURE CONVERTER FOR AN INTERNAL COMBUSTION ENGINE.
JPS63122926A (en) * 1986-11-13 1988-05-26 Nippon Denso Co Ltd Piezoelectric pressure detector
DE3811311C1 (en) * 1988-04-02 1989-03-09 Robert Bosch Gmbh, 7000 Stuttgart, De

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57132035A (en) * 1981-02-09 1982-08-16 Toyota Central Res & Dev Lab Inc Knocking detector of internal combustion engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57132035A (en) * 1981-02-09 1982-08-16 Toyota Central Res & Dev Lab Inc Knocking detector of internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0719335U (en) * 1992-01-17 1995-04-07 出川 光代 Efficiency hat

Also Published As

Publication number Publication date
JPS57142536A (en) 1982-09-03

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