JPH0445765B2

JPH0445765B2 -

Info

Publication number: JPH0445765B2
Application number: JP18857383A
Authority: JP
Inventors: Aputo Yurugen; Hantoman Deiiteru; Shuarutsu Rainharuto; Uotsuheru Berutoruto
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1982-10-14
Filing date: 1983-10-11
Publication date: 1992-07-27
Also published as: JPS5988624A

Description

【発明の詳細な説明】〔産業上の利用分野〕本発明は、間欠的に動作する噴射ポンプの個々
の噴射の噴射量および噴射量の変化を測定する装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for measuring the injection quantity and changes in the injection quantity of individual injections of an intermittently operated injection pump.

[Conventional technology]

このような公知の装置では、噴射ポンプの各噴
射通路に固有の測定装置を設ける必要があるが、
これは費用を要しかつ複雑である。 In such known devices, it is necessary to provide a specific measuring device for each injection channel of the injection pump;
This is expensive and complex.

[Problem to be solved by the invention]

本発明の課題は、１つの測定装置で、検査すべ
き任意の数の噴射通路の測定を可能にすることで
ある。 The object of the invention is to make it possible to measure any number of injection channels to be inspected with one measuring device.

[Means to solve the problem]

この課題を解決するため本発明によれば、噴射
ポンプの個々の噴射行程あたりの噴射量を測定す
る装置が、噴射ポンプの噴射ノズルに接続されか
つ調整可能な絞り弁と可動壁とをもつ噴射室と、
この可動壁の変位を検出する行程センサと、絞り
弁を介して噴射室に接続される連続流量測定装置
とを含み、行程センサの出力信号の振幅から噴射
ポンプの噴射行程あたりの噴射量を求め、この出
力信号の時間的微分値と連続流量測定装置の測定
値との差から噴射行程あたりの噴射量の時間的変
化を求める。 To solve this problem, the invention provides that a device for measuring the injection quantity per individual injection stroke of the injection pump is connected to the injection nozzle of the injection pump and has an adjustable throttle valve and a movable wall. room and
It includes a stroke sensor that detects the displacement of this movable wall and a continuous flow rate measuring device connected to the injection chamber via a throttle valve, and calculates the injection amount per injection stroke of the injection pump from the amplitude of the output signal of the stroke sensor. From the difference between the temporal differential value of this output signal and the measured value of the continuous flow rate measuring device, the temporal change in the injection amount per injection stroke is determined.

さらに本発明によれば、噴射ポンプの個々の噴
射行程あたりの噴射量を測定する装置が、噴射ポ
ンプの噴射ノズルに接続される噴射室と、この噴
射室に直列接続される容積形ポンプと、この容積
形ポンプに並列接続される通路内に設けられる可
動ピストンとを含み、このピストンの行程から噴
射ポンプの噴射行程あたりの噴射量を求め、ピス
トン行程の時間的微分値と容積形ポンプの吐出量
との差から噴射行程あたりの噴射量の時間的変化
を求める。 Further, according to the present invention, the device for measuring the injection amount per each injection stroke of the injection pump includes an injection chamber connected to an injection nozzle of the injection pump, and a positive displacement pump connected in series to the injection chamber. The displacement pump includes a movable piston provided in a passage connected in parallel to the displacement pump, and the injection amount per injection stroke of the injection pump is determined from the stroke of this piston, and the time differential value of the piston stroke and the discharge of the displacement pump are calculated. The temporal change in the injection amount per injection stroke is determined from the difference between the injection amount and the injection amount.

〔Effect of the invention〕

こうして本発明によれば、噴射ポンプの個々の
噴射通路（噴射ノズル）の噴射量を測定するの
に、１つの測定装置を使用して、噴射行程毎にお
ける可動壁の変位または可動ピストンの行程を検
出し、必要な場合には、行程毎における検出値の
比を求めれば充分であり、さらに変位または行程
の時間的微分値と連続流量測定装置の測定値また
は容積形ポンプの吐出量の差から噴射量の時間的
変化を求め、この変化から噴射開始時期および噴
射終了時期も求めることができる。 Thus, according to the invention, one measuring device is used to measure the injection quantity of the individual injection channels (injection nozzles) of the injection pump, and the displacement of the movable wall or the stroke of the movable piston during each injection stroke is measured. If necessary, it is sufficient to calculate the ratio of the detected value for each stroke, and further, from the difference between the time differential value of the displacement or stroke and the measured value of a continuous flow rate measuring device or the discharge amount of a positive displacement pump. The temporal change in the injection amount is determined, and the injection start timing and injection end timing can also be determined from this change.

[Embodiment]

特許請求の範囲第２項ないし第７項および第９
項および第１０項は、本発明の好ましい実施態様
を示している。 Claims 2 to 7 and 9
Sections 1 and 10 indicate preferred embodiments of the invention.

〔Example〕

図面について本発明の実施例を説明すると、第
１図に１０で１つの噴射ノズル（複数であつても
よい）が示され、これに噴射室すなわち容積Ｖが
接続されている。この容積Ｖは、大体において管
路１１と、この管路の可動壁を形成する波形ダイ
ヤフラム缶１２から成つている。管路１１は絞り
弁１４の穴１３に通じ、この穴１３内に絞りピス
トン１５が案内され、穴１３から突出するピスト
ン１５の端部にねじ軸１６が設けられている。こ
のねじ軸１６を駆動する調整電動機１７は、行程
センサ１８により増幅器１９を介して制御され
る。行程センサ１８は、波形ダイヤフラム缶１２
の変位ｓを無接触で検出する。 Describing an embodiment of the invention with reference to the drawings, FIG. 1 shows at 10 an injection nozzle (or nozzles) to which an injection chamber or volume V is connected. This volume V essentially consists of a conduit 11 and a corrugated diaphragm can 12 forming the movable wall of this conduit. The conduit 11 leads into a bore 13 of the throttle valve 14, in which a throttle piston 15 is guided, and at the end of the piston 15, which projects from the bore 13, a threaded shaft 16 is provided. A regulating motor 17 driving this screw shaft 16 is controlled by a stroke sensor 18 via an amplifier 19 . The stroke sensor 18 is a corrugated diaphragm can 12
The displacement s of is detected without contact.

絞りピストン１５は、この絞りピストン１５を
収容する穴１３のスリツト２０を制御して、後述
するように容積Ｖの圧力を一定に保つ。この穴１
３は穴２１を経て後にある連続流量測定装置２３
に接続されている。この測定装置２３は大体にお
いて歯車ポンプ２４とこれに並列接続されるピス
トン２５からなり、このピストン２５はポンプ２
４の入口と出口との圧力差を受けている。このピ
ストンの中央位置からのずれが、歯車ポンプ２４
の回転数を調整するため、調整電気回路２６を介
して歯車ポンプを駆動する調整電動機へ与えられ
る。歯車ポンプ２４は、ほぼ一定の容積流量を吐
出する。歯車ポンプ２４の出口導管２８の端部に
は圧力調整器２９が設けられて、ほぼ2barの圧
力を維持する。歯車ポンプ２４の回転数n₁は容積
流量に比例し、周波数アナログ信号として周波数
比計数器２７の第１の入力端へ与えられる。計数
器２７の第２の入力端には、噴射ポンプの回転数
の周波数アナログ信号n₂が与えられる。したがつ
て計数器２７の表示値n₁／n₂は、噴射ポンプのす
べての出口について平均化された個別行程噴射量
に比例している。噴射ノズル１０から噴射される
噴射ポンプの吐出量すなわち噴射量は、小さく保
たれて気泡のない液体容積Ｖへ噴射される。 The throttle piston 15 controls the slit 20 of the hole 13 in which it is accommodated to keep the pressure of the volume V constant, as will be explained later. this hole 1
3 is a continuous flow rate measuring device 23 located after the hole 21
It is connected to the. This measuring device 23 essentially consists of a gear pump 24 and a piston 25 connected in parallel with it, which piston 25 is connected to the pump 2
It is subject to a pressure difference between the inlet and outlet of 4. This deviation from the center position of the piston causes the gear pump 24
is applied via a regulating electric circuit 26 to a regulating motor which drives the gear pump. Gear pump 24 delivers a substantially constant volumetric flow rate. A pressure regulator 29 is provided at the end of the outlet conduit 28 of the gear pump 24 to maintain a pressure of approximately 2 bar. The rotational speed n ₁ of the gear pump 24 is proportional to the volumetric flow rate and is applied as a frequency analog signal to a first input of the frequency ratio counter 27 . A frequency analog signal n ₂ of the rotational speed of the injection pump is applied to a second input of the counter 27 . The displayed value n ₁ /n ₂ of the counter 27 is therefore proportional to the individual stroke injection quantity averaged over all outlets of the injection pump. The discharge amount of the injection pump, ie, the injection amount, which is injected from the injection nozzle 10 is kept small and is injected into a bubble-free liquid volume V.

波形ダイヤフラム缶１２のたわみ（変位）ｓを
検出する行程センサ１８は絞りピストン１５を制
御して、容積Ｖの平均圧力p₁が例えば3barとなる
ようにしている。調整電動機１７により、一定の
平均噴射量において圧力p₁が変化しても、絞り弁
１４の設定がある範囲p₁±Δp内に保たれる。こ
の設定で行程センサ１８は第２図による経過をも
つ信号ｓ(t)を発生する。この図において振幅は
個々の噴射の１行程あたりの噴射量に対する尺度
を示している。横軸には時間ｔが記入されてい
る。絞り弁１４の後における圧力p₂は約2barであ
る。 A stroke sensor 18, which detects the deflection (displacement) s of the corrugated diaphragm can 12, controls the throttle piston 15 so that the average pressure _p1 of the volume V is, for example, 3 bar. The regulating motor 17 keeps the setting of the throttle valve 14 within a certain range p ₁ ±Δp even if the pressure p ₁ changes at a constant average injection quantity. With this setting, the travel sensor 18 generates a signal s(t) with a curve according to FIG. In this figure, the amplitude is a measure of the injection quantity per stroke of the individual injections. Time t is written on the horizontal axis. The pressure p ₂ after the throttle valve 14 is approximately 2 bar.

個々の噴射量パルスがほぼ同じ経過をもつとい
う仮定のもとで、行程毎の噴射量の比は Q₁／Q₂＝h₁／h₂ として表わされる。ここで第３図によりQ_o（ｎ＝
１，２…）は行程ｎにおける噴射量、h_oは行程信
号ｓ(t)の振幅、t_oは個別噴射の長さである。 Under the assumption that the individual injection quantity pulses have approximately the same course, the ratio of the injection quantities per stroke is expressed as Q ₁ /Q ₂ =h ₁ /h ₂ . Here, according to Figure 3, Q _o (n=
1, 2...) is the injection amount in the stroke n, _ho is the amplitude of the stroke signal s(t), and t _o is the length of the individual injection.

さらに（p₁＝一定として） ds／dt≒ｑ(t)−q₀ ここでｑ(t)は噴射過程における噴射量の変化、
q₀は連続流量測定装置２３を通つて流出する一定
の連続流量である。 Furthermore (assuming p ₁ = constant) ds/dt≒q(t)−q ₀ where q(t) is the change in injection amount during the injection process,
q ₀ is the constant continuous flow rate exiting through the continuous flow measuring device 23 .

したがつて噴射行程における噴射量変化を示す
第３図の信号経過ｓ(t)から、噴射開始時期、噴射
終了時期を求め、また振幅h_oを介して個別行程噴
射量の比を求めることができる。パルスの立上り
辺および立下り辺が急峻であるほど、測定の精度
がよくなることは明らかである。 Therefore, it is possible to determine the injection start timing and injection end timing from the signal curve s( _t ) shown in FIG. can. It is clear that the steeper the rising and falling edges of the pulse, the better the accuracy of the measurement.

第４図による第２実施例は再び流量測定装置４
０をもつており、この装置４０へ１つの噴射ノズ
ル１０（複数であつてもよい）が実際上直接に噴
射を行ない、しかも容積形ポンプとしての歯車ポ
ンプ４２へ通ずる通路４１と可動ピストン４４が
案内されている並列な通路４３とへ噴射を行な
う。通路４１，４３は、ピストン４４の運動によ
つてのみ変化する容積Ｖを形成している。ピスト
ン４４の行程ｓは、一方では調整電気回路４５を
介して歯車ポンプ４２の回転数調整用調整電動機
４６へ供給され、他方では導線４７を介して表示
装置４８へ供給され、この表示装置４８におい
て、第２図におけるように振幅が、個々の噴射の
１行程あたりの噴射量の尺度として表示される。 The second embodiment according to FIG.
0, into which the injection nozzle (or nozzles 10) practically directly injects, and a channel 41 leading to a gear pump 42 as a positive displacement pump and a movable piston 44. Injection is carried out into the guided parallel passages 43. The passages 41, 43 define a volume V that changes only by the movement of the piston 44. The stroke s of the piston 44 is fed on the one hand via a regulating electric circuit 45 to a regulating motor 46 for adjusting the speed of the gear pump 42 and on the other hand via a line 47 to a display device 48 in which it is , as in FIG. 2, the amplitude is displayed as a measure of the injection quantity per stroke of the individual injections.

計量装置を兼ねる表示装置４８には次の量、す
なわち連続流量q₀、噴射ポンプの回転数n₂、噴射
量パルスの振幅h_on、噴射ポンプのノズル（出口）
の数ｎ（１〜ｚ）、測定中における噴射ポンプの回
転数ｍが供給される。これらの値から１行程あた
りの噴射量Q_oが次式により求められる。 The display device 48, which also serves as a metering device, displays the following quantities: continuous flow rate q ₀ , rotational speed n ₂ of the injection pump, amplitude h _on of the injection quantity pulse, and nozzle (outlet) of the injection pump.
number n (1 to z) and the number of revolutions m of the injection pump during measurement are supplied. From these values, the injection amount _Qo per stroke is determined by the following formula.

[Brief explanation of drawings]

第１図は本発明による噴射量測定装置の概略構
成図、第２図および第３図はその作用を説明する
線図、第４図は第２実施例の概略構成図である。１０……噴射ノズル、１１……管路、１２……
可動壁、１４……絞り弁、１８……行程センサ、
２３……連続流量測定装置、４２……容積形ポン
プ、４３……通路、４４……可動ピストン、Ｖ…
…噴射室。 FIG. 1 is a schematic block diagram of an injection amount measuring device according to the present invention, FIGS. 2 and 3 are diagrams illustrating its operation, and FIG. 4 is a schematic block diagram of a second embodiment. 10...Injection nozzle, 11...Pipe line, 12...
Movable wall, 14...throttle valve, 18...stroke sensor,
23... Continuous flow measuring device, 42... Positive displacement pump, 43... Passage, 44... Movable piston, V...
...Ejection chamber.

Claims

[Claims] 1. A device for measuring the injection amount per individual injection stroke of an intermittently operating injection pump is connected to an injection nozzle 10 of the injection pump and comprises an adjustable throttle valve 14 and a movable wall 12. a stroke sensor 18 that detects the displacement s of the movable wall 12;
A continuous flow rate measuring device 23 connected to the injection chamber V via the throttle valve 14 determines the injection amount per injection stroke of the injection pump from the amplitude of the output signal of the stroke sensor 18, and calculates the temporal differentiation of this output signal. An injection amount measuring device, characterized in that the temporal change in the injection amount per injection stroke is determined from the difference between the measured value and the measured value of a continuous flow rate measuring device. 2. The movable wall 12 is constructed as a corrugated diaphragm can, the deflection s of which is fed by a stroke sensor 18 as an electric signal to a regulating motor 17, which in turn drives a screw shaft 16 connected to the throttle piston 15 of the throttle valve 14. characterized by driving,
Apparatus according to claim 1. 3. The device according to claim 1 or 2, characterized in that the stroke sensor 18 operates without contact. 4. Device according to one of the claims 1 to 3, characterized in that the instantaneous camshaft angle of the injection pump is associated with the signal of the stroke sensor 18. 5. Device according to claim 1, characterized in that the cross section 20 of the throttle valve 14 is regulated by a mechanical-hydraulic pressure regulator that is dependent on the pressure in the injection chamber V. 6. Claims 1 or 5, characterized in that the device for adjusting the cross section of the throttle valve 14 exhibits a low-pass filter characteristic or is constructed as a two-position regulator with hysteresis. The device described in. 7. Device according to claim 1, characterized in that at least one outlet of the injection pump is led into the injection chamber. 8 A device for measuring the injection amount per each injection stroke of an injection pump that operates intermittently is connected to an injection chamber V connected to the injection nozzle 10 of the injection pump, and a positive displacement pump connected in series to this injection chamber V. 42 and
A passage 43 connected in parallel to this positive displacement pump 42
The injection amount per injection stroke of the injection pump is determined from the stroke of this piston 44, and the injection stroke is determined from the difference between the time differential value of the piston stroke and the discharge amount of the positive displacement pump 42. An injection amount measuring device characterized by determining temporal changes in the injection amount per unit. 9, characterized in that the piston 44 controls a pump motor 46 via a regulating electrical circuit 45;
Apparatus according to claim 8. 10. Device according to claim 8, characterized in that the injection chamber V is formed by a passage of a flow measuring device.