CN110945232A

CN110945232A - Device and method for adjusting the return pressure of an injector

Info

Publication number: CN110945232A
Application number: CN201880053536.6A
Authority: CN
Inventors: A.巴塔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-06-19
Filing date: 2018-05-28
Publication date: 2020-03-31
Anticipated expiration: 2038-05-28
Also published as: RU2770084C2; RU2020100580A; EP3642472B1; BR112019026976B1; RU2020100580A3; DE102017210147A1; CN110945232B; EP3642472A1; WO2018233980A1; BR112019026976A2

Abstract

The invention relates to a device (10) for adjusting the return pressure of an injector (12), comprising: a return line (14) having a first end (14 a) to which a return outlet (12 a) of the injector (12) can be connected directly or indirectly in such a way that a return quantity (16) of the injector (12) flows from the first end (14 a) of the return line (14) to a second end (14 b) of the return line (14); and at least one valve (20) by means of which the return pressure can be set at least between the first end (14 a) of the return line (14) and the valve (20) in the return line (14), wherein the device (10) has an electrically adjustable throttle (20) as the valve (20). The invention also relates to a return block for an injector (12), a measuring device for measuring an injection quantity and/or a return quantity for at least one injector (12), and a test bench for at least one injector (12). The invention further relates to a method for adjusting the return pressure on at least one injector (12).

Description

Device and method for adjusting the return pressure of an injector

Technical Field

The invention relates to a device for adjusting the return pressure of an injector and a return block for an injector. The invention also relates to a measuring device for measuring an injection quantity and/or a return quantity for at least one injector and to a test bench for at least one injector. The invention further relates to a method for adjusting the return pressure at least one injector.

Background

Test stands for injectors (injection valves) and injection pumps are known from the prior art, for example test stand EPS 815 from robert bosch llc. When inspecting the injector, it is usual to measure not only the injection quantity but also the return quantity with the return pressure applied.

Disclosure of Invention

The invention provides a device for adjusting the return pressure of an injector having the features of claim 1, a return block for an injector having the features of claim 7, a measuring device for measuring the injection quantity and/or the return quantity of at least one injector having the features of claim 9, a test stand for at least one injector having the features of claim 10, and a method for adjusting the return pressure of at least one injector having the features of claim 11.

The use according to the invention of an electrically adjustable throttle valve (for adjusting/regulating the return pressure) is relatively tolerance-free, as a result of which inaccuracies in adjusting/regulating the return pressure are avoided/minimized. In particular, the return pressure can be set/regulated more precisely/reliably by means of an electrically adjustable throttle valve than is customary with conventional mechanical pressure-holding valves, which are usually used to set/regulate the return pressure (possibly together with switching valves) according to the prior art. Since deviations of the return pressure from the setpoint return pressure lead to variations in the injection quantity and/or the return quantity in some injector types, the quality of the measurement of the injection quantity and/or the return quantity can also be improved (or the measurement deviations in the measurement of the injection quantity and/or the return quantity reduced) by means of the improved accuracy of the adjusted/regulated return pressure.

In an advantageous embodiment of the device for return pressure adjustment, the return pressure can be selectively adjusted to each return pressure value with at least two different sets of return pressure values by means of an electrically adjustable throttle, at least between the first end of the return line and the electrically adjustable throttle in the return line. The return pressure can be varied, as a rule, by means of an electrically adjustable throttle valve by means of a relatively large set of different return pressure values, wherein advantageous accuracy is maintained when adjusting/regulating the return pressure to the setpoint return pressure of the respective injector type of the injector connected to the first end. The device for return pressure regulation described here is therefore suitable for a plurality of different injector types or injector generations, even if these different injector types or injector generations require/require different return pressures. For example, several different types of electrically adjustable throttle valves can be used to enable the adjustable return pressure to be varied over a range of values between 0 bar and 10 bar. The embodiment of the device for adjusting the return pressure described here thus eliminates the conventional disadvantage that a device with a specially designed mechanical pressure holding valve, which has been described in detail for this purpose, has to be used up to now for each injector type and for each injector. The operator of the device for adjusting the return pressure described here therefore does not need different devices for different injector types or injector generations. It is also possible to dispense with the use of the device for adjusting the reflux pressure described here. The operator thus saves money, storage space in the workshop and also does not waste set-up time (for equipping the device used by the operator with correspondingly adapted accessories).

The electrically adjustable throttle valve may be, for example, a common rail pressure regulating valve or a diesel common rail pressure regulating valve. The electrically adjustable throttle valve can alternatively also be a high-pressure injection valve or a gasoline high-pressure injection valve. The valve type described here is an inexpensive actuator. Furthermore, the valve type described here can be used as an electrically adjustable throttle valve reliably in conjunction with a standard pressure sensor (from the motor vehicle sector) which is inexpensive.

The device may in particular have a control unit which is designed to emit at least one control signal having a modulated pulse width in order to actuate the rail pressure regulating valve or the diesel rail pressure regulating valve or the high-pressure injection valve or the gasoline high-pressure injection valve in a timed manner. The valve types listed here can therefore also be used to reliably regulate/regulate the return pressure in the low pressure range.

The device preferably also comprises a pressure sensor and/or a temperature sensor connected to the return line between the first end of the return line and the electrically adjustable throttle. The provision of a pressure sensor for the device for adjusting the return pressure makes it possible to set the return pressure by "throttling" by means of an electrically adjustable throttle, so that the return pressure rises at least between the first end of the return line and the electrically adjustable throttle in the return line until the desired setpoint return pressure/target pressure is reached. The dynamic pressure occurring between the first end of the return line and the electrically adjustable throttle can be detected by a pressure sensor and used to adjust the electrically adjustable throttle accordingly. The additional use of a temperature sensor also allows thermodynamic effects to be taken into account.

The advantages described above are also achieved in a return block for an injector with at least two such devices for adjusting the return pressure. The return block may also have at least one control unit which is designed to emit at least one control signal having a modulated pulse width in order to actuate at least one associated rail pressure control valve or diesel rail pressure control valve or high-pressure injection valve or gasoline high-pressure injection valve in a timed manner.

The above-mentioned advantages are also achieved by a measuring device for measuring the injection quantity and/or the return quantity for at least one injector, with at least one such device for adjusting the return pressure or a corresponding return block and at least one injection quantity sensor and/or return quantity sensor, by means of which the injection quantity and/or the return quantity flowing through the associated return line can be measured.

The above-mentioned advantages can also be achieved accordingly by means of a test stand for at least one injector, which test stand has a corresponding measuring device for measuring the injection quantity and/or the return flow quantity.

Furthermore, the implementation of a corresponding method for adjusting the return pressure on at least one injector also creates the above-mentioned advantages. It is explicitly pointed out that the method for adjusting the return pressure can be developed according to the above-described embodiment of the device.

Drawings

Further features and advantages of the invention are explained below with the aid of the figures. In the figure:

FIG. 1 shows a schematic view of an embodiment of an apparatus for reflux pressure regulation;

FIG. 2 shows a schematic diagram of one embodiment of a reflow block; and is

Fig. 3 shows a flow chart for explaining an embodiment of a method for adjusting the return pressure at the at least one injector.

Detailed Description

Fig. 1 shows a schematic illustration of an embodiment of a device for return pressure regulation.

The device 10 for return pressure regulation, which is schematically shown in fig. 1, can be (together) applied/used to check/verify an injector 12. Injector 12 may refer to a common rail injector or an injection valve. As will be explained more precisely below, a device 10 for return pressure regulation with a plurality of different types of injectors 12 (or different generations of injectors 12) can be used.

The device 10 for return pressure regulation has a return line 14. The return outlet 12a of the ejector 12, from which the return quantity 16 of the ejector 12 comes out (directly or indirectly) of the ejector 12, can be connected to the first end 14a of the return line 14 in such a way/such that the return quantity 16 of the ejector 12 flows from the first end 14a of the return line 14 to the second end 14b of the return line 14. As an alternative to the return outlet 12a being directly connected to the first end 14a of the return line 14 (wherein the return outlet 12a contacts the first end 14a of the return line 14), the return outlet 12a may also be connectable/connected to the first end 14a of the return line 14 by at least one connecting means. (the connection of the injection port 12b of the injector 12 to the return line 14 is not made, and the injection quantity 18 of the injector 12 comes out of the injector 12 through the injection port).

The device 10 for adjusting the return pressure also comprises an electrically adjustable throttle 20, by means of which the return pressure can be adjusted at least between the first end 14a of the return line 14 with the connected injector 12 and the electrically adjustable throttle 20 in the return line 14. (the return pressure is thus present as a defined pressure between the injector 12 and the electrically adjustable throttle 20.) the use of an electrically adjustable throttle 20 allows a high accuracy in adjusting/regulating the return pressure. The return pressure can be set/regulated in a particularly reliable manner to a desired/predetermined setpoint return pressure. Furthermore, the return pressure in the return line 14 (at least between the first end 14a of the return line and the electrically adjustable throttle 20) can generally be selectively adjusted to each return pressure value with a set of at least two different return pressure values by means of the electrically adjustable throttle 20. The device 10 for return pressure regulation can therefore also be applied to different injector types and different injector generations, even if their desired/predetermined setpoint return pressures differ from one another. The use of the device 10 for return pressure regulation thus achieves the advantages already explained above to reduce costs, save set-up time and reduce space requirements.

The device 10 for return pressure regulation preferably also comprises a pressure sensor 22 connected to the return line 14 between the first end 14a of the return line 14 and the electrically adjustable throttle 20. In this case, too, a return pressure is set by means of the interaction between the electrically adjustable throttle 20 and the pressure sensor 22. The device 10 for adjusting the return pressure can also additionally comprise a temperature sensor (not shown in fig. 1).

The electrically adjustable throttle 20 may be, for example, a common rail pressure regulating valve (or a diesel common rail pressure regulating valve). Although the (diesel) common rail pressure control valve (as a hydraulic proportional valve) is designed for higher pressures (between 1800 bar and 2500 bar, depending on the type), a set of values of the usual setpoint return pressure in the return line 14 (at least between the first end 14a of the return line and the electrically adjustable throttle 20) can also be achieved by means of the clocked actuation of the (diesel) common rail pressure control valve by pulse width modulation. This enables the reflux pressure in the low-pressure range (between 0 bar and 10 bar) to be brought about and reliably maintained. The control device 24 of the device 10 for regulating the return pressure is therefore preferably designed to emit at least one control signal 26 with a modulated pulse width for the timed actuation of the (diesel) common rail pressure control valve.

It is also advantageous if the electrically adjustable throttle 20 is a high-pressure injection valve (or a gasoline high-pressure injection valve). For setting/regulating the return pressure, the (gasoline) high-pressure injection valve can be actuated/actuated by an actuating device 24 by means of at least one control signal 26 (for example a simple square-wave signal) having a modulated pulse width. The actuation of the (gasoline) high-pressure injection valve by means of a complex actuation signal is not required, which is based on the complex final stage for generating the complex actuation signal.

With the exemplary embodiments of the electrically adjustable throttle valve 20 listed above, the pressure adjustment/pressure regulation is achieved without costly control and without costly additional costs. This also contributes to a significant reduction in the product protection effort during operation of the device 10 for adjusting the return pressure.

In a further embodiment of the device 10 for adjusting the return pressure (as a measuring device for measuring the injection quantity and/or the return quantity), an injection quantity sensor and/or a return quantity sensor 28 can also be provided on the device 10 for adjusting the return pressure, by means of which the injection quantity 18 and/or the return quantity 16 flowing through the return line 14 can be measured. The device 10 for adjusting the return pressure can thus be used in a wide variety of ways. The device 10 for return pressure adjustment may for example be part of a test bench.

FIG. 2 shows a schematic diagram of one embodiment of a reflow block.

The backflow block schematically shown in fig. 2 can be used to check/verify a plurality of injectors 12. For this purpose, the return block has a plurality of devices 10 for adjusting the return pressure. Each of the devices 10 for backflow pressure regulation comprises the components of the previous embodiments. As a further alternative, each of the devices 10 for adjusting the return pressure also has a filter 30 and a temperature sensor 32. Wherein each device for return pressure regulation 10 is designed for regulating/regulating the return pressure to each return pressure value with a set of at least two different return pressure values, wherein the devices for return pressure regulation 10 are simultaneously capable of regulating/regulating the simultaneously different return pressures in their respective return lines 14 (at least between the first end 14a of the respective return line and the respective electrically adjustable throttle 20). The recirculation block of fig. 2 can thus be used simultaneously for different injector types and different injector generations.

The return block preferably also has at least one control device 24, which is designed to emit at least one control signal 26 with a modulated pulse width in order to actuate at least one associated rail pressure control valve or diesel rail pressure control valve or high-pressure injection valve or gasoline high-pressure injection valve in a timed manner. As also shown in fig. 2, the return mass can also be used as a measuring device (or as a test stand) for measuring the injection quantity and/or the return quantity.

The above-described embodiments of the device 10 for backflow pressure regulation and of the backflow block enable a generally active pressure regulation by using common motor vehicle components instead of conventional industrial components. This also helps to reduce costs when implementing the embodiments.

The above-described embodiment achieves high accuracy (without significant deviation) in adjusting/regulating the return pressure. They contribute to an increase in the accuracy of the measurement when measuring the injection quantity 18 and/or the return quantity 16 and to an increase in the persuasion of the measurement results obtained.

All the above-described embodiments make it possible to dispense with accessories, so that additional costs for accessories can be saved and the conventional effort for product protection in terms of development can be eliminated. Installation time is likewise saved and the floor space for storing accessories is no longer required for further use.

In method step S1, the return pressure is set at least between a first end of the return line and a valve in the return line, wherein the return outlet of the ejector is connected to the first end in such a way that the return quantity of the ejector flows from the first end of the return line to a second end of the return line. For this purpose, the return pressure is regulated at least between the first end of the return line and the electrically adjustable throttle in the return line by means of an electrically adjustable throttle. In the line between the injector and the electrically adjustable throttle, the return pressure is thus generated as a defined pressure.

Preferably, for an injector of a first type, the return pressure is adjusted to a first return pressure value at least between the first end of the return line and the electrically adjustable throttle in the return line, and for an injector of a further/second type, which is different from the first type, the return pressure is adjusted to a further/second return pressure value, which is not equal to the first return pressure value, at least between the first end of the return line and the electrically adjustable throttle in the return line. This may also occur when the rated return pressure of the respective type/respective generation is adjusted simultaneously on a plurality of types/respective generations of injectors, respectively.

Alternatively, method step S2 can also be carried out simultaneously with or time-staggered with method step S1, in method step S2 the injection quantity and/or the return quantity of the at least one injector being measured. The method described here may therefore also be referred to as a method for measuring an injection quantity and/or a return quantity on at least one injector.

Claims

1. Device (10) for adjusting the return pressure of an injector (12), comprising:

a return line (14) having a first end (14 a) to which a return outlet (12 a) of the ejector (12) can be connected directly or indirectly in such a way that a return quantity (16) of the ejector (12) flows from the first end (14 a) of the return line (14) to a second end (14 b) of the return line (14); and

at least one valve (20) by means of which the return pressure can be set at least between the first end (14 a) of the return line (14) with the connected injector (12) and the valve (20) in the return line (14);

characterized in that the device (10) has an electrically adjustable throttle (20) as the valve (20), wherein the return pressure can be adjusted at least between the first end (14 a) of the return line (14) with the connected injector (12) and the electrically adjustable throttle (20) in the return line (14) by means of the electrically adjustable throttle (20).

2. The device (10) for return pressure adjustment according to claim 1, wherein the return pressure can be selectively adjusted by means of the electrically adjustable throttle (20) at least between the first end (14 a) of the return line (14) and the electrically adjustable throttle (20) in the return line (14) to each return pressure value of a set of values with at least two different return pressure values.

3. The 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 backflow pressure regulation according to claim 1 or 2, the electrically adjustable throttle valve (20) being a high-pressure injection valve or a gasoline high-pressure injection valve.

5. The device (10) for return pressure regulation according to claim 3 or 4, wherein the device (10) has a control mechanism (24) which is designed to emit at least one control signal (26) with a modulated pulse width for the timed actuation of the common rail pressure regulating valve or the diesel common rail pressure regulating valve or the high-pressure injection valve or the gasoline high-pressure injection valve.

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

7. A return block for an ejector (12) with at least two devices (10) for return pressure regulation according to any one of claims 1 to 4 and 6.

8. The return block according to claim 3 and/or 4 and claim 7, wherein the return block has at least one control mechanism (24) which is designed to emit at least one control signal (26) with a modulated pulse width for the timed actuation of at least one associated rail pressure regulating valve or diesel rail pressure regulating valve or high-pressure injection valve or gasoline high-pressure injection valve.

9. Measuring device for measuring an injection quantity and/or a return quantity for at least one injector (12), comprising:

at least one device (10) for backflow pressure adjustment according to any of claims 1 to 6 or a backflow block according to claim 7 or 8; and

at least one injection quantity sensor and/or return quantity sensor (28) by means of which the injection quantity (18) and/or the return quantity (16) flowing through the associated return line (14) can be measured.

10. Test stand for at least one injector (12) with a measuring device for measuring injection quantities and/or return quantities according to claim 9.

11. Method for return pressure regulation on at least one injector (12), with the steps:

adjusting the return pressure by means of at least one valve (20) at least between a first end (14 a) of the return line (14) and the valve (20) in the return line (14), wherein a return outlet (12 a) of the ejector (12) is connected to the first end in such a way that a return quantity (16) of the ejector (12) flows from the first end (14 a) of the return line (14) to a second end (14 b) of the return line (14);

characterized in that the return pressure (S1) is adjusted at least between the first end (14 a) of the return line (14) with the connected injector (12) and the electrically adjustable throttle (20) in the return line (14) by means of an electrically adjustable throttle (20) as the valve (20).

12. Method for return pressure adjustment according to claim 11, wherein the return pressure is adjusted to a first return pressure value at least between the first end (14 a) of the return line (14) and an electrically adjustable throttle (20) in the return line (14) for an injector (12) of a first type, and to a second return pressure value, different from the first return pressure value, at least between the first end (14 a) of the return line (14) and the electrically adjustable throttle (20) in the return line (14) for an injector (12) of a second type, different from the first type.