EP3642472A1

EP3642472A1 - Device and method for return pressure adjustment for an injector

Info

Publication number: EP3642472A1
Application number: EP18728098.7A
Authority: EP
Inventors: Armin Batha
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-06-19
Filing date: 2018-05-28
Publication date: 2020-04-29
Anticipated expiration: 2038-05-28
Also published as: DE102017210147A1; BR112019026976B1; BR112019026976A2; CN110945232A; CN110945232B; RU2770084C2; WO2018233980A1; EP3642472B1; RU2020100580A; RU2020100580A3

Abstract

The invention relates to a device (10) for return pressure adjustment for an injector (12), comprising a return line (14) having a first end (14a) at which a return outlet opening (12a) of the injector (12) can be directly or indirectly attached such that a return amount (16) of the injector (12) flows from the first end (14a) of the return line (14) to a second end (14b) of the return line (14), and comprising at least one valve (20) by means of which a return pressure can be adjusted at least between the first end (14a) of the return line (14) and the valve (20) in the return line (14), wherein the device (10) has an electrically adjustable throttle valve (20) as the valve (20). The invention also relates to a return block for injectors (12), a measuring device for measuring injection amounts and/or return amounts for at least one injector (12), and a test rig for at least one injector (12). The invention further relates to a method for return pressure adjustment in at least one injector (12).

Description

description

title

Apparatus and method for return pressure adjustment for an injector

The invention relates to a device for return pressure adjustment for an injector and a return block for injectors. Likewise, the invention relates to a measuring device for injection quantity and / or return flow measurement for at least one injector and a test stand for at least one injector. Furthermore, the invention relates to a method for adjusting the return pressure to at least one injector.

State of the art

Test stands for injectors (injection valves) and injection pumps, such as, for example, the EPS 815 test bench from Robert Bosch GmbH, are known from the prior art. In general, in an examination of an injector not only an injection quantity, but also by applying a return pressure, a return amount is measured.

Disclosure of the invention

The invention provides a device for return pressure adjustment for an injector with the features of claim 1, a return block for injectors with the features of claim 7, a measuring device for injection quantity and / or return flow measurement for at least one injector with the features of claim 9, a test stand for at least one injector with the features of claim 10 and a method for

Return pressure setting on at least one injector with the features of claim 11. Advantages of the invention

The inventive use of the electrically adjustable throttle valve for adjusting / regulating the return pressure is relatively tolerance-free, whereby inaccuracies in setting / adjusting the return pressure can be avoided / reduced to a minimum. In particular, compared to conventional mechanical pressure holding valves, which are usually used according to the prior art for adjusting / regulating the return pressure (possibly together with a switching valve), the return pressure can be more accurate / reliable by means of the electrically adjustable throttle valve

Set / einregeln. Since a deviation of the return pressure from a desired return pressure in some injector types to a variation of

Injection amount and / or the return amount leads, can also increase a quality of the measurements of the injection quantity and / or the return amount by means of the improved accuracy of the set / regulated return pressure

(or errors in measuring the injection quantity and / or the return amount can be reduced).

In an advantageous embodiment of the device for

Return pressure setting is adjustable by means of the electrically adjustable throttle valve, the return pressure at least between the first end of the return line and the electrically adjustable throttle valve in the return line either to each return pressure value of a set of values with at least two different return pressure values. In general, the return pressure by means of the electrically adjustable throttle valve over a comparatively large

Value set of different return pressure values are varied, at the same time the advantageous accuracy in setting / adjusting the

Return pressure is guaranteed to a target return pressure of the respective injector type of connected to the first end injector remains. The return pressure setting device described here is therefore suitable for a variety of different types of injectors or injector generations, even if they require / require different return pressures. For example, with a variety of different types of electrically adjustable

Throttle valves the adjustable / adjustable return pressure via a

Value range between 0 bar to 10 bar can be varied. The one described here Therefore, the embodiment of the device for return pressure adjustment eliminates the conventional disadvantage that hitherto for each type of injector and for each generation of injector, a device specially specified for this purpose, which has the specially designed mechanical pressure-retaining valves, had to be used. An operator of the device described here for

Return pressure adjustment therefore does not need different devices for different injector types or injector generations. Additional equipment can also be saved by means of the device for returning pressure adjustment described here. The operator thus saves money, storage space in the workshop and also loses no set-up time (to populate the used by him

Device with the appropriate additional authority).

For example, the electrically adjustable throttle valve may be a common rail pressure control valve or a diesel common rail pressure control valve. Alternatively, the electrically adjustable throttle valve may also be a high-pressure injection valve or a gasoline high-pressure injection valve. The ones described here

Valve types are low-cost actuators. Besides, they can be here

valve types described as electrically adjustable throttle valve reliably cooperate in conjunction with a low-cost standard pressure sensor (from the automotive sector).

In particular, the device may have a controller which is designed to output at least one control signal with modulated pulse width for pulsed control of the common rail pressure control valve or diesel common rail pressure control valve or high pressure injector or gasoline high pressure injector. Thus, the valve types listed here can also be used for reliable setting / adjustment of return pressures in the low pressure range.

Preferably, the device also comprises a pressure sensor connected between the first end of the return line and the electrically adjustable throttle valve on the return line and / or a temperature sensor. The equipment of the device for return pressure adjustment with the

Pressure sensor allows a regulation of the return pressure by means of the electrically adjustable throttle valve by "throttling", so that the Return pressure increases at least between the first end of the return line and the electrically adjustable throttle valve in the return line until a desired target return pressure / target pressure is reached. A resulting between the first end of the return line and the electrically adjustable throttle valve back pressure can be detected by the pressure sensor and used for a corresponding control of the electrically adjustable throttle valve. An additional use of the temperature sensor also allows consideration of thermodynamic influences.

The advantages described above are also in a return block for injectors with at least two such devices for

Return pressure setting realized. Also, the return block may have at least one controller, which is designed to at least one

Output control signal with modulated pulse width for clocked activation of at least one associated common rail pressure control valve or diesel common rail pressure control valve or high-pressure injector or gasoline high-pressure injector.

Also a measuring device for Einspritzmengen- and / or

Return flow measurement for at least one injector with at least one such device for return pressure setting, or a corresponding return block, and at least one Einspritzmengen- and / or

Return flow sensor, by means of which an injection quantity and / or the flowing through the associated return line return quantity can be measured, causes the advantages described above.

Accordingly, the advantages described above are also by means of a

Test bench for at least one injector with a corresponding one

Measuring device for Einspritzmengen- and / or return flow measurement effected.

Furthermore, performing a corresponding method of return pressure adjustment to at least one injector also provides the above

described advantages. It is expressly stated that the Method for return pressure adjustment according to the device embodiments described above can be further developed.

Brief description of the drawings

Further features and advantages of the present invention will be explained below with reference to the figures. Show it:

Fig. 1 is a schematic representation of an embodiment of the

Device for return pressure adjustment;

Fig. 2 is a schematic representation of an embodiment of the

Return block; and

3 is a flowchart for explaining an embodiment of the invention

Method for return pressure adjustment on at least one injector.

Embodiments of the invention

Fig. 1 shows a schematic representation of an embodiment of the

Device for return pressure adjustment.

The apparatus 10 shown schematically in Fig. 1 for

Return pressure adjustment can be used for testing / checking an injector 12. Under the injector 12, a common rail injector or an injection valve can be understood. As will be explained in more detail below, the return pressure setting device 10 is provided with a plurality of different types of injectors 12 (or different

Generations of injectors 12) usable.

The device 10 for return pressure adjustment has a return line 14. A return outlet opening 12a of the injector 12, from which a return amount 16 of the injector 12 exits the injector 12, is (directly or indirectly) at a first end 14a of the return line 14 so connectable / tethered that the return amount 16 of the injector 12 from the first end 14a of the return line 14 to a second end 14b of

Return line 14 flows. As an alternative to a direct connection of the return outlet opening 12a to the first end 14a of the return line 14, wherein the return outlet opening 12a, the first end 14a of the return line

14 contacted, the return outlet opening 12a can also be connected / connected via at least one connection component at the first end 14a of the return line 14. (An attachment of an injection port 12b of the injector 12, through which an injection amount 18 of the injector 12 exits the injector 12, the return line 14 is not.)

The device 10 for return pressure adjustment also includes an electrically adjustable throttle valve 20, by means of which a return pressure at least between the first end 14a of the return line 14 with the connected injector 12 and the electrically adjustable throttle valve 20 in the

Return line 14 is adjustable. (The return pressure is thus present as a defined pressure between the injector 12 and the electrically variable throttle valve 20.) The use of the electrically variable throttle valve 20 allows a high accuracy in setting / adjusting the

Return pressure. In particular, the return pressure can be reliably set / adjusted equal to a desired / predetermined target return pressure. In general, by means of the electrically adjustable throttle valve 20, the return pressure (at least between the first end 14 a of

Return line and the electrically adjustable throttle valve 20) in the return line 14 optionally to each return pressure value of a set of values with at least two different return pressure values adjustable. Therefore, the return pressure setting apparatus 10 may be used for various injector types and injector generations even if their desired target return pressures deviate from each other. A use of the device 10 for return pressure adjustment therefore allows the above-mentioned advantages for cost reduction, makeready time savings and space reduction.

Preferably, the return pressure setting device 10 also includes one between the first end 14a of the return line 14 and the one electrically adjustable throttle valve 20 connected to the return line 14

Pressure sensor 22. In this case, a regulation of the return pressure by means of an interaction of the electrically adjustable throttle valve 20 and the pressure sensor 22 is possible. In addition, the device 10 for return pressure adjustment can also have a (not shown in FIG. 1)

Include temperature sensor.

The electrically adjustable throttle valve 20 may be, for example, a common rail pressure control valve (or a diesel common rail pressure control valve). Although a (diesel) common rail pressure control valve (as

Hydraulic proportional valve) for comparatively high pressures (depending on the type between 1800 bar and 2500 bar) is designed by means of a clocked control of the (diesel) common rail pressure control valve with a modulation of pulse widths and a set of values of common set return pressures (at least between the first end 14a of the return line and the electrically adjustable throttle valve 20) in the return line 14 effected. Thus, even return pressures in the low-pressure range (between 0 bar to 10 bar) can be effected and can be reliably maintained. Preferably, therefore, is a

Control 24 of the device 10 for return pressure adjustment designed to at least one control signal 26 with a modulated pulse width to the clocked

To output control of the (diesel) common rail pressure control valve.

It is also advantageous if the electrically adjustable throttle valve 20 is a high-pressure injection valve (or a gasoline high-pressure injection valve). To set / regulate the return pressure, the (gasoline) high-pressure injection valve can be actuated / controlled by the control 24 by means of at least one control signal 26 (for example a simple square-wave signal) with modulated pulse width. A control of the (gasoline) high-pressure injector by means of complex control signals, which is a complex

Power amplifier for generating the complex drive signals requires is not necessary.

The previously enumerated embodiments of the electrically adjustable throttle valve 20 allow pressure adjustment / pressure control without a complex driving effort and without high additional costs. This also causes a significant reduction in product maintenance expense during operation of the return pressure adjustment device 10.

In a further development of the device 10 for return pressure adjustment (as a measuring device for injection quantity and / or return flow measurement) can still an injection quantity and / or return flow sensor 28, by means of which the injection quantity 18 and / or flowing through the return line 14 return amount 16 are measured on the device 10 for

Return pressure setting to be formed. The device 10 for

Return pressure adjustment is thus versatile. The device 10 for

Return pressure setting may be part of a test stand, for example.

Fig. 2 shows a schematic representation of an embodiment of the

Return block.

The return block shown schematically in Fig. 2 is for

Examination / inspection of multiple injectors 12 can be used. For this purpose, the return block on several devices 10 for return pressure adjustment. Each of the return pressure adjustment devices 10 comprises the components of the previously described embodiment. Only as optional

Further developments, each of the devices 10 for return pressure adjustment each have a filter 30 and a respective temperature sensor 32. Each of the

Return pressure adjustment devices 10 are configured to adjust the return pressure to each return pressure value of a set of values having at least two different return pressure values, the return pressure setting devices simultaneously controlling different return pressures in their respective return line 14 (at least between the first end 14a of the respective return line and the respective one electrically adjustable throttle valve 20) can set / adjust simultaneously. The return block of FIG. 2 can thus be used simultaneously for different injector types and different injector generations.

Preferably, the return block also has at least one controller 24, which is designed to control at least one control signal 26 with a modulated pulse width for the clocked activation of the at least one associated one Common Rail Pressure Regulator or Diesel Common Rail Pressure Regulator or High Pressure Injector or Gas High Pressure Injector. As also shown in FIG. 2, the return block can also be used as a measuring device for injection quantity and / or return flow measurement (or as a test stand).

The above-described embodiments of the device 10 for

Return pressure setting and the return flow block enable universal active pressure adjustment / pressure control by using common ones

Motor vehicle components instead of conventional industrial components. This also contributes to the cost reduction in the realization of the embodiments.

The embodiments described above allow high accuracy in the setting / adjustment of return pressures (without any appreciable scattering). In this way, they contribute to increasing a measuring accuracy when measuring the injection quantity 18 and / or the return quantity 16 and to increasing the validity of the measurement results obtained.

All embodiments described above allow a waiver of additional equipment, so that additional costs for additional equipment can be saved and a conventional effort for development-side product care is eliminated. Similarly, set-up times can be saved and no longer required for storage of Zusatzbehörs workshop area can be used elsewhere.

FIG. 3 is a flowchart for explaining an embodiment of the method for returning pressure setting to at least one injector.

In a method step S1, a return pressure is at least between a first end of a return line to which a return outlet opening of the injector is connected so that a return amount of the injector flows from the first end of the return line to a second end of the return line, and the valve in the return line set. This is the

Return pressure by means of an electrically adjustable throttle valve, at least set between the first end of the return line and the electrically adjustable throttle valve in the return line. In a wiring harness between the injector and the electrically adjustable throttle valve is thus the return pressure as a defined pressure.

Preferably, for a first type of injector, the return pressure is at least between the first end of the return line and the electrically adjustable throttle valve in the return line to a first

Return pressure value set while for one of the first type

deviating other / second type of injector, the return pressure at least between the first end of the return line and the electrically adjustable throttle valve in the return line to another / second

Return pressure value is set not equal to the first return pressure value. This can also be done if a set return pressure of the respective type / generation is set simultaneously at several types / generations of injectors.

Optionally, concurrent or temporally overlapping with the

Process step Sl still a process step S2 are performed, in which an injection quantity and / or a return amount of the at least one injector are measured. The method described here can thus also be referred to as a method for measuring the quantity and / or amount of return flow at at least one injector.

Claims

claims

A device (10) for return pressure adjustment for an injector (12) comprising: a return line (14) having a first end (14a) to which a return outlet opening (12a) of the injector (12) is directly or indirectly connectable such that a Return flow (16) of the injector (12) flows from the first end (14a) of the return line (14) to a second end (14b) of the return line (14); and at least one valve (20), by means of which a return pressure at least between the first end (14a) of the return line (14) with the

Tailored injector (12) and the valve (20) in the return line (14) is adjustable; characterized in that the device (10) comprises an electrically adjustable throttle valve (20) as the valve (20), wherein by means of the electrically adjustable throttle valve (20) the return pressure at least between the first end (14a) of the return line (14) with the Tailored injector (12) and the electrically adjustable throttle valve (20) in the return line (14) is adjustable.

2. Device (10) for return pressure adjustment according to claim 1, wherein by means of the electrically adjustable throttle valve (20) of the return pressure at least between the first end (14 a) of the return line (14) and the electrically adjustable throttle valve (20) in the return line (14). optionally to each return pressure value of a set of values of at least two

various return pressure values is adjustable.

3. Device (10) for return pressure adjustment according to claim 1 or 2, wherein the electrically adjustable throttle valve (20) is a common rail pressure regulating valve or a diesel common rail pressure regulating valve.

4. The device (10) for return pressure adjustment according to claim 1 or 2, wherein the electrically adjustable throttle valve (20) is a high-pressure injection valve or a high-pressure gasoline injection valve.

5. Device (10) for return pressure adjustment according to claim 3 or 4, wherein the device (10) comprises a controller (24) which is adapted to at least one control signal (26) with a modulated pulse width for clocked driving of the common rail pressure control valve or diesel common rail pressure regulator or high pressure injector or high pressure gasoline injector.

6. Device (10) for return pressure adjustment according to one of the preceding claims, wherein the device (10) connected between the first end (14 a) of the return line (14) and the electrically adjustable throttle valve (20) on the return line (14) connected pressure sensor ( 22) and / or a temperature sensor (32).

7. return block for injectors (12) with at least two devices (10) for return pressure adjustment according to one of claims 1 to 4 and 6.

8. return block according to claim 3 and / or 4 and claim 7, wherein the return block has at least one controller (24) which is adapted to at least one control signal (26) with a modulated pulse width for clocked driving of at least one associated common rail Pressure control valve or diesel common rail pressure control valve or high-pressure injector or gasoline high-pressure injector output.

9. Measuring device for Einspritzmengen- and / or

Return flow measurement for at least one injector (12) with: at least one return pressure setting device (10) according to any one of claims 1 to 6 or a return block according to claim 7 or 8; and at least one injection amount and / or return quantity sensor (28), 5 by means of which an injection quantity (18) and / or by the associated

Return line (14) flowing return flow (16) is measurable.

10. test stand for at least one injector (12) with a measuring device for injection quantity and / or return flow measurement according to claim 9. o

11. A method for return pressure adjustment on at least one injector (12) with the step:

Adjusting a return pressure by means of at least one valve (20) at least 5 between a first end (14a) of a return line (14) to which a

Return outlet opening (12a) of the injector (12) is connected so that a return amount (16) of the injector (12) flows from the first end (14a) of the return line (14) to a second end (14b) of the return line (14), and the valve (20) in the return line (14);

0

characterized in that the return pressure by means of an electrically adjustable throttle valve (20) as the valve (20) at least between the first end (14a) of the return line 5 (14) with the connected injector (12) and the electrically adjustable

Throttling valve (20) in the return line (14) is set (Sl).

12. A method for return pressure adjustment according to claim 11, wherein for a first type of injector (12) the return pressure at least between the 0 first end (14 a) of the return line (14) and the electrically adjustable

Throttle valve (20) in the return line (14) is set to a first return pressure value and for a different from the first type second type of injector (12) of the return pressure at least between the first end (14a) of the return line (14) and the electrically adjustable Throttle valve (20) in the return line (14) is set to a second return pressure value other than the first return pressure value.