CS260433B1

CS260433B1 - Digital measuring device for fuel injection pumps' injection dose magnitude determination

Info

Publication number: CS260433B1
Application number: CS858087A
Authority: CS
Inventors: Frantisek Sysel
Original assignee: Frantisek Sysel
Priority date: 1985-11-11
Filing date: 1985-11-11
Publication date: 1988-12-15
Also published as: CS808785A1

Abstract

Zařízení pro měření velikosti vstřikovaného množství vstřikovacích čerpadel pro naftové nebo benzinové motory. Vstřikované množství je odměřováno jako přesně změřená vykonaná dráha lehkého pístku ve válci, jehož prostor je v okamžiku měření vstřikovaného množství uzavřen. Odměření proběhne tak, že po uzavření měřicího prostoru od vnějšího prostředí se nejprve do uzavřeného měřicího prostoru načerpá několik přípravných výstřiků, přičemž se po posledním přípravném výstřiků přesně odměří snímačem a elektronickým zařízením poloha měřicího pístku, pak se vykoná požadovaný počet již vlastních měřených výstřiků a po posledním měřeném výstřiků se opět přesně odměří snímačem a elektronickým zařízením poloha měřicího pístku. Rozdíl obou přesně změřených poloh měřicího pístku a tím přesně určený, ohraničený objem za známý, požadovaný počet měřených výstřiků se pak příslušnou elektronickou částí vyhodnotí jako vstřikované množství v mm3/ /zdv, cm3/200 zdv atd. a zobrazí na displeji. Měření vstřikovaného množství je možné podle potřeby libovolně opakovat i automatizovat.Injection size measuring equipment number of injection pumps for diesel or petrol engines. Injected the amount is measured as accurately measured the light piston path in the cylinder whose space is injected at the time of measurement quantity closed. The measurement will take place so that after closing the measuring space from the outside to the closed of the measuring space preparatory shots, taking after the last preparatory spraying accurately measures the sensor and electronic equipment location the measuring plunger, then the desired plunger is executed number of already measured sprays already in and after the last measured shots are again accurate sensor and electronic device measuring plunger position. The difference between the two exactly measured positions of the measuring piston a the precisely determined, bounded volume per known, desired number of measured shots then the respective electronic part evaluated as injected amount in mm3 / / wall, cm3 / 200 wall, etc., and displayed. Injection rate measurement is possible according to need to repeat and automate as needed.

Description

The subject of the invention is a digital measuring device for determining the injection rate of injection pumps, in particular for adjusting and controlling the injection rate of injection pumps of gasoline and petrol engines.

The adjustment of the injection pumps to the size of the injected quantity and the dispersion of the amount between the injection units is carried out for the purpose of the intended test stations. To measure the injected quantity, the so-called measuring top of the test station is used, with a known embodiment containing one metering unit with a calibrated glass cylinder, an injector and a corresponding tilting device for each dispensing section of the injection pump, which discharges in the time when it is not measured. the test fluid to be poured into the overflow, during the measurement period, for a given number of strokes 100, 200, 300, 400, etc., which is determined by the adjusting rule, the spraying test fluid is fed to the calibrated graduated cylinder with 0 marks , 1 cm 3, 0.2 cm 3, 0.5 cm 3, and in the post-dose measurement period, the test liquid is left in a calibrated measuring cylinder to visually read the injected amount by adjuster. liquid from the measuring rolls by means of manual adjustment of the tilting device, it is discharged to the overflow and a device for further measurement is prepared. Essentially, the measurement of the injected amount by means of calibrated glass measuring cylinders for said large number of strokes, its introduction and simultaneous use is made difficult by the precise metering of a small volume of the spray test liquid, with one or more tubes, which is one mm 3.

The prior art device for measuring the injection quantity has considerable disadvantages. At present, it is slow, for the purpose-built testing laboratories of service companies, where a large number of injection pumps are being set up with little productivity in the measurement question, in addition to the precision given by the cutter's division, it plays a significant rolisubjective readout of the leveler. emptying before the next measurement. The measuring cycle cannot be automated.

The above-mentioned disadvantages, high productivity, increased measurement accuracy, the possibility of digitizing and further processing of the values by the computer, easy reading of the injection quantity from the display, microprocessor control, etc., are solved by the invention of the digital injection device. with an electrohydraulic metering unit applied to one injector pump outlet, or each injector pump outlet, in which an electro-hydraulic metering unit with a light metering plunger is utilized for very rapid metering of the injection quantity during at least one spraying operation in which the path of the metering piston can be easily and accurately measured with the respective path sensors in the manner described below, using the individual functional parts in the assembly according to the invention.

A schematic diagram of an embodiment of an electrohydraulic metered dose measuring device for determining the injection rate of an injection pump is shown in the accompanying drawings, wherein Fig. 1 shows an electrohydraulic metering unit of a digital injection rate measurement method; , naobr. 3 shows the sequence of the main signal electronic parts in one measuring cycle of the injected quantity.

Electrohydraulic Measuring Unit 1 is connected to the injection pump 1 by means of an injection tube 2. The injector 3 with the nozzle 8 is attached to the body 6 by means of screws 4 and a mounting 5, sealed to the injection space 9 by means of a gasket 7 below the injector 3. In the nozzle outlet space 9 a spraying sensor 10 is provided which is hermetically mounted in the plate 11 pressed against the sealing ring 12 by means of a plurality of bolts 13p of the periphery of the plate 11. A damping insert 14 is disposed in the upper part of the unit 6. The measuring piston 17 is connected via a channel 27 to the body of the unit 6 by a method. A distance sensor 25 of a light hollow measuring piston 17 is connected to the roller 18, the tapered part extending into the path sensor 25. The measuring piston 17 is pressed into the left-hand position, to the bottom 19 in the measuring piston 15 by means of a weak vent spring 18. The cylindrical cylinder 16 is provided in its central region for maximum measured injection quantity, to protect the electrohydraulic measuring unit from damage. in the case of a failure of the electromagnetic valve 22, by the passage channel 26. The passage passage 26 serves simultaneously for the evacuation liquid, possibly interspersed with a non-deleterious clearance between the measuring cylinder 16 and the light measuring piston 17, after a long period of operation into the space around the weak spring13. an electromagnetic valve 29 is connected to the metering cylinder 16 hermetically via the channel 28, the housing 21 of which is seated in the seat 23 separates the measuring piston 15 from the space in the solenoid valve 23 connected to the external environment via channel 24 .

The block diagram in Fig. 2 of the electronic part of the digital measuring device of the injected quantity consists of an electromagnetic valve 22, a track sensor 25 measured by a 260433 piston, a spraying sensor 10, a sensor of pulses 33, from a control unit 30 with a button 31 for a measuring a cycle, with a button 32 for automatic measurement of a non-continuous repetition, with a button 33 for a "STOP" measurement, further from a signal processing amplifier 29 from a path sensor of the measuring piston 25, a converter 34, adjusting. a signal in analogue form, possibly directing a signal to a digital form, a memory 40 of the measuring piston path, a memory 41 of the measuring piston path, a counter preselection 36, a counter preselection of pulses 37, a counter of the actual measured shots38, a counter with a preselection of pulses 39 , from the signal processing unit 42 from the memory 40, 41, the buffer memory 43 to display the measured value of the injected quantity on the display 44.

The solenoid 22 is connected to the output of the control unit 30. The sensor piston path 23 is connected to the input V of the amplifier29. The spraying sensor 10 is connected to a counter input V of a pre-selection counter 36 and to a counter input V of a pre-selection counter 38 and to a counter input V of a pre-selected actual sprays 38. The angle pulse sensor 33 is connected to the counter input V with the pre-wobble pulses 37, 39. The control unit 30 is electrically coupled with the buttons 31, 32, 33. The output E of the control unit 30 is coupled to the counter gate H with the pre-selection of the pre-shots 38. The output of the control unit 30 is connected to the zero ob N counters of the counters with preselection of the preparatory sprays 36 and of the actual measured sprays38, further with reset counters N of the counter with pre-selection of the pulses 37, 39. The input of the control unit 30 is connected to the output of the counter with the preselection of the pulses 39. The output C of the control unit 30 is connected to the evaluation unit 42, the output B i is associated with the buffer 43 V increases and the amplifier of 29 is connected to the input of the converter 34. The output of DAC 34 is input spojense in memory 40 preparatory dráhyměřicího plunger and the input path in the memory 41koncové measuring piston. The outputs 40 of the measuring path of the measuring piston 41 of the measuring piston end path are connected to the inputs V of the evaluation unit 42. The output A of the evaluation unit 42 is connected to the input in the buffer memory 43, the output A of the memory 43 is connected to the display 44. Output A counter with preselection shots 36 is coupled to gate H for opening the counter gate with the preselect pulses 37. Counter A with counter preselection 37 is coupled by shake H to open memory 40 of the measuring plunger path and further with gate H to open counter counters with preset measured sprays 38. The output A of the counter of preselected actual sprays 38 is connected to gate H to open the counter with preselection of the pulses 39. Output A of the counter with the preselection of the pulses 39 is connected to the gate 11 for opening the track 41 of the measuring path terminal and also with input V of the control unit 30.

The sequence of the main measurement and control signals in time relation shown in Fig. 3, where I is the signal from the control unit 30 to fit the plug 21 into the seat 23 of the electromagnetic valve 22. II. There is a voltage variation after the amplifier 29 corresponding to the displacement of the measuring piston 17 by the liquid ejecting into the closed spray chamber 9 and thus into the spatial piston 15. III. The waveform signal from the spraying sensor 10, which gives the pulse at each spray and corresponds to the time level change of the signal level II, once per revolution of the injection pump camshaft. IV. - is the waveform of the signal from the angular pulses 35 giving at least about 5C one impls when the camshaft of the injection pump is rotated. V. - is the waveform of the output A of the counter being preselected by the preparatory sprays 36 after counting the pre-set number of preparatory sprays. VI. The waveform of the output A of the counter is a preselection of the angular pulses 37 after counting the preset number of angular pulses from the angular pulse transducer 35 to redefine the voltage take-off point. into the measuring path preparation memory 40, between two successive apertures, while applying signal VI. an anchoring of the counter H of the counter with the preset measured sprays 38 for starting a counting of the preset number of the actual measured sprays. VII. - is the time-defined subscription of voltage level II. in the period 47 between the sprays into the memory 40 of the measuring piston preparation path, i.e. remembering the voltage U i corresponding to the path of the measuring piston 17. VIII. - the waveform of the output A of the counter is the preselection of the actual measured sprays38, ie, after the preset number of the actual measured sprays has been executed. 2SÓ433 IX. The waveform of the output A of the counter is a preselection of the angular pulses 39 after deducting a preset number of angular pulses from the angular pulse sensor 33 to de-energize the voltage level II. signal IX. the control unit 30 as information to complete the measuring cycle. X. - is the time-defined subscription level 1 of level II. in the period 48 between the sprays into the memory 41 of the measuring piston end path, i.e. igniting the voltage U2 corresponding to the path of the measuring piston 17. XI. - is the pulse course in the control unit 30, after a short delay - from the beginning of the pulse IX. the control unit is instructed to terminate the measuring cycle, ie to open the electromagnetic valve 22, to close the counter of the pre-selected spray counter 36, to reset the counters 36, 37, 38, 39 and to prepare for further measurements at the same time sending a pulse to the evaluation unit 42o to perform a difference of the values UQ = U- '- Ui, H (n2) = h2 - hi, expressing the value of the injected quantity Q and handover43 and displaying the measured value Q on the display 44 .

The progress of the signals in Fig. 3 is shown for the preset 5 shots of the preparatory and preselected 10 shots of the measured ones.

The apparatus shown in the attached drawings operates in such a way that, during the period when it is not measured, the ejected liquid flows into the nozzle section of the nozzle 9 through the damping insert 14 through the channel 27 into the measuring piston chamber 15, further through the channel 2S into the electromagnetic valve chamber. 28 and flow freely through the channel 24 into the external environment. Press the 31 and 32 buttons respectively to display. 2, the control unit 30 outputs the electromagnet solenoid signal I and the counter opening H with the preselection of the 3S preparatory sprays. The plug 21 of the electromagnet 22 is seated in the seat 23 and the measuring space of the piston 15 is closed due to the volume changes of the fuel injected from the nozzle 8 into the closed nozzle chamber 9 and the measuring piston 17 into the interrupted sliding motion against the coil 18, while the movement of the track sensor 25 is accurately measured and amplified by the amplifier 29, see course II. in Fig. 3. The signal of the amplifier 29 is fed to a quick converter 34 from the digital form to the digital memory 40 of the measuring piston track of the measuring piston 41 of the measuring piston end path, or after conversion in the converter 34 to the analogue memory 40 of the measuring piston path. the analogue memory 41 of the measuring piston end track when the piston is used and the measuring piston end track memory 41 is processed by the evaluation unit 42, transmitted to the buffer 43 and displayed by the display 44 according to instructions from the control unit 30. the plunger 17 at each subsequent shot by a relationship

where h - is the increment of the measuring piston path, Q - the volume of liquid injected in one injection into the injection space of the nozzle 9a of the measuring piston space 15, F - is a cross section of the measuring piston.

The measuring plunger track sensor 25 may be inductive, capacitive, photoelectric, ultrasonic, laser, etc., and measures the plunger of the measuring plunger linearly as the plunger U = f (hj, when the plunger 17 is moved into the sliding movement in conjunction with the respective amplifier29). where U - is the voltage at the output A of the amplifier 29, h - is the path of the measuring station 17. After the preset number of preparatory sprays has been executed by a subtracted counter with pre-selection of the preparatory sprays 36, e.g. 5 x A h, and after the counting of the still preselected number of angular pulses, for example 50 pulses by a counter preselection of the pulses 37 from the pulses sensor 23, for example a 5 ° rotation of the injection pump camshaft, i.e. after a short delay the end of the last preparatory shot at the time thus defined 3, after the pulse VI from the counter with the preselection pulses 37, a voltage U1 = f [hi] is taken into the storage path 40 of the measuring piston, where Ut is the voltage of the respective path of the track hi by the measuring piston 17, performing preselected preparatory shots, e.g. After executing several of the pre-selected preparatory shots, simultaneously with the VI. 2, a counter with the self-measured self-measured sprays 38 in FIG. 2 is started from the counter of the pre-selection of the angle pulses 37 into the memory 40 of the measuring piston of the measuring piston and a countdown of the preset self-measured sprays is started. After subtracting these pre-selected self-measured sprays onto the counter with the actual metered shots preselected 38, e.g. after the total track of the measuring piston 17 has been executed, h = 5 x A h + 10 x A h from the original rest position when touching the bottom 19, and by subtracting an even preselected number of pulses, for example 50 pulses by a preselect counter 39 angular markers 35, e.g.

Claims

About 5 ° rotation of the camshaft of the injection pump, i.e., after a short delay after the end of the last self-measured injection, at the time 48 defined in this way after the pulse IX. from the counter with the preselection of the pulses 39, the voltage 411 takes the voltage already = f (li2) into the memory 41 of the end of the measuring piston 17, where U2 is the voltage corresponding to the execution of the path h? the measuring piston 17, hz - is the track of the measuring piston 17 after executing a preselected 112 of its own measured sprays, for example 10 of its own measured sprays. The calculation of the measured quantity in the evaluation unit 42 is carried out by subtracting the voltage U2 and Ui, i. UQ = U2 - Ui, it is converted to a length value 11 (112) = hs - hi, for the above example na = 10; h (io) = ha - hi and calculates the injected quantity of digital or analogue. q = htnž) * FΠ2 For the example given n _ h (10> x FU 10 'where h (n2) - is the track of the measuring plunger 17 when performing preset on, for example, 10 custom measured shots; The cross section of the piston, x - is the injection amount at one shot, and simultaneously with the pulse IX of the counter with the pre-selection of the pulses 39 to the memory 41 of the measuring piston 17, the impedance

A digital measuring device for determining a spray rate of an injector, in which the fuel injected by the injector connected to an injection pump is directed to a spray injector attached to the measurement device by means of screws and a shim, sealed in the device, sprayed in a measuring device and further guided through a thrust pad to a volumetric portion, characterized in that the electrohydraulic measuring unit is formed by the unit body (6) to which the spout sensor (101, which is hermetically mounted in the plate (11) pressed onto the sealing ring) is connected (12) by means of screws (13) along the periphery of the plate (11), where a volumetric cup (16) with a lightly hollow, measuring measuring device is hermetically connected to the upper part of the body (6) via a channel (27) a piston (17) pressed to the flat (19) by a central spring (18) where The other end of the measuring piston extends in part to the connected path sensor (25) and the measuring cylinder (16) is provided with a passage channel (26), the pulse IX being further away. to the measuring cycle termination unit 30. The controller 30 issues a short time delay τ of the pulse XI. and opens the solenoid valve 22. In this way, the nozzle chamber 9 and the measuring chamber 15 of the piston 15 are connected to the solenoid space 20a and the test liquid, when spraying, begins to flow back through the channel 24 into the overflow, the measuring piston 17 being pushed back by the central spring 18 back to the initial position, ie. at the same time to the bottom 19. At the same time, the control unit emits a pulse to close the counter gate H with a preselection of the preparatory sprays 36, to reset the counter with the preselection pre-selection 36, counters with the preselection of the pulses 37, counters with the preselection home Furthermore, the control unit 39 controls the calculation of the quantities in the evaluation unit 42 in the above manner and instructs to register the measured value in the buffer 43 and display the injected amount Q in the desired format on the display. 44. After pressing button 31 again for one cycle, the entire measuring cycle is repeated. When the automatic measurement button 32 is pressed, the control unit that is adequately equipped will terminate one pulse cycle to automatically switch the measuring cycle back on after a selectable short period of time and this measuring rhythm will be repeated at all times. Pressing the 33 - STOP - button ends the measuring cycle at any stage. With this measuring device, the measuring section of the test station can be equipped with a common control unit. EXCEEDING the measuring cylinder (16) hermetically connected to the electromagnetic valve (22) with the plug (21) to close the measuring piston (15) from the space (20) that is connected to the outer shell. (24).

2. Apparatus according to claim 1, characterized in that the solenoid valve (22) is connected to the output (A) of the control unit (30), the measuring piston path sensor (25) is connected to the input (V) of the amplifier (29). ), the spray sensor (10) is connected to the inlet (V) of the reader preselection counter (36) and is connected to the input (V) with the counter input (V) of the preselection of the actual measured sprays (38), the sensor pulses (35) a counter with a preselection of the pulses (37) and at the same time a counter input (V) of the preselection of the pulses (39), the control unit (30) is electrically connected to the pushbutton for a single dial (31), with a pushbutton for automatic the measurement (32), with the STOP button (33), the output (E) of the control unit (30) is coupled to the gate (H) of the preselection counter 1212 (361th output (D) of the control unit (30) is connected with zeroing of the circuit (N) of the preselected counter, preparatory spraying (36), with the reset circuit (N) of the counter of the actual measured sprays (38), further with the reset circuit (N) of the counter with the preselection of the pulses (37) and with the reset circuit (N) of the counter with preselection pulses (39), input (V) of the control unit (30) is connected to the output (A) of the counter by preselecting the angular pulses 139), the output (C) of the control unit (30) is connected to the evaluation unit (43), the output (B) is with the buffer (43), the output (A) of the amplifier (29) is connected to the input (V) of the converter (34), the output (A) of the converter (34) is connected to the input (V) of the memory (40) of the preparatory path the measuring piston and the inlet (V) of the measuring path end path memory (41), the outputs (A) of the piston preparation path memory (40) and the measuring piston end path memory (41) are connected to inputs (V) of the evaluation unit (42), the output (A) of the evaluation unit (42) is connected to the buffer input (V) (43), the output (A) the memory (43) is connected by a display (44), the counter (A) of the counter with pre-selection (36) is coupled to the gate (H) to open the counter of the counter with the preselected pulses (37), output ( A) the counter of the angle pulse preselection (37) is connected to the gate (H) for opening the measuring piston preparation path memory (40) and further with the gate (H) for opening the counter gate with the preset of the actual measured shots (38), the output ( A) the counter of preselecting the actual measured shots (38) is connected to the gate (H) to open the counter with the preselection of the pulses (39), the output (A) of the counter with the preselected pulses (39) is connected to the gate (H) of the opening of the memory (41) the end of the measuring piston and longer also with the input (V) of the control unit (30).

3. Apparatus according to claim 2, characterized in that the angle pulse sensor (35) is connected to the camshaft of the injection pump. 3 sheets of drawings