DE102017210147A1 - Apparatus and method for return pressure adjustment for an injector - Google Patents

Abstract

The invention relates to a device (10) for adjusting the return pressure for an injector (12) having a return line (14) with a first end (14a) to which a return outlet opening (12a) of the injector (12) can be connected directly or indirectly so that a return flow (16) of the injector (12) from the first end (14a) of the return line (14) to a second end (14b) of the return line (14) flows, 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) and the valve (20) in the return line (14) is adjustable, wherein the device (10) has an electrically adjustable throttle valve (20) as the valve (20). Likewise, the invention relates to a return block for injectors (12), a measuring device for Einspritzmengen- and / or return flow measurement for at least one injector (12) and a test stand for at least one injector (12). Furthermore, the invention relates to a method for adjusting the return pressure on at least one injector (12).

Description

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 adjustment to 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 set / adjusted more accurately / reliably by means of the electrically adjustable throttle valve. Since a deviation of the return pressure from a desired return pressure in some injector types leads to a variation of an injection quantity and / or the return quantity, the quality of the measurements of the injection quantity and / or the return quantity can also be increased (or increased) by means of the improved accuracy of the adjusted / regulated return pressure Deviations in measuring the injection quantity and / or the return quantity are reduced).

In an advantageous embodiment of the device for return pressure adjustment of the return pressure at least between the first end of the return line and the electrically adjustable throttle valve in the return line is selectively adjustable to each return pressure value of a set of values with at least two different return pressure values by means of the electrically adjustable throttle valve. As a rule, the return pressure can be varied by means of the electrically adjustable throttle valve over a comparatively large set of different return pressure values, while ensuring the advantageous accuracy in adjusting / regulating the return pressure to a desired return pressure of the respective injector type of the connected at the first end injector , 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, can be varied over a set of values between 0 bar to 10 bar with a variety of different types of electrically adjustable throttle valves, the adjustable / adjustable return pressure. The embodiment of the device for return pressure adjustment described here therefore eliminates the conventional disadvantage that hitherto for each type of injector and for each generation of injectors a device specially specified for this purpose, which has the specially designed mechanical pressure-retaining valves, had to be used. An operator of the return pressure setting device described here 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 (for equipping the device used by him 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 valve types described here are low-cost actuators. In addition, the valve types described here, as an electrically adjustable throttle valve, can reliably interact 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 generate at least one control signal with modulated pulse width for the clocked control of the common rail Pressure control valve or diesel common rail pressure control valve or high-pressure injector or gasoline high-pressure injector issue. 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 Rücklaufdruckeinstellung with the pressure sensor allows Einregelung 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 / 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 realized in a return block for injectors with at least two such devices for return pressure adjustment. Also, the return block may have at least one controller which is designed to at least one control signal with modulated pulse width for clocked driving the 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 issue.

Also, a measuring device for Einspritzmengen- and / or return flow measurement for at least one injector with at least one such device for Rücklaufdruckeinstellung, or a corresponding return block, and at least one Einspritzmengen- and / or return flow sensor, by means of which an injection quantity and / or through the associated return line flowing return quantity can be measured, causes the advantages described above.

Accordingly, the advantages described above can also be effected by means of a test stand for at least one injector with a corresponding measuring device for injection quantity and / or return flow measurement.

Furthermore, performing a corresponding method of return pressure adjustment on at least one injector also provides the advantages described above. It is to be expressly understood that the method of return pressure adjustment can be further developed in accordance with the device embodiments described above.

list of figures

• 1 eine schematische Darstellung einer Ausführungsform der Vorrichtung zur Rücklaufdruckeinstellung;
• 2 eine schematische Darstellung einer Ausführungsform des Rücklaufblocks; und
• 3 ein Flussdiagramm zum Erläutern einer Ausführungsform des Verfahrens zur Rücklaufdruckeinstellung an zumindest einem Injektor.

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

• 1 a schematic representation of an embodiment of the device for return pressure adjustment;
• 2 a schematic representation of an embodiment of the return block; and
• 3 a flowchart for explaining an embodiment of the method for return pressure adjustment to at least one injector.

Embodiments of the invention

1 shows a schematic representation of an embodiment of the device for return pressure adjustment.

In the 1 schematically illustrated device 10 to return pressure setting is to inspect / check an injector 12 (Co-) used / usable. Under the injector 12 may be understood a common rail injector or an injection valve. As will be explained in more detail below, the device is 10 for return pressure adjustment with a variety 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 on. A return outlet opening 12a of the injector 12 , from which a return amount 16 of the injector 12 from the injector 12 exit is (directly or indirectly) at a first end 14a the return line 14 so attachable / tethered that the return flow 16 of the injector 12 from the first end 14a the return line 14 to a second end 14b the return line 14 flows. As an alternative to a direct connection of the return outlet opening 12a to the first end 14a the return line 14 in which the return outlet opening 12a the first end 14a the return line 14 contacted, the return outlet opening 12a also via at least one connection component at the first end 14a the return line 14 connectable / tethered. (A connection of an injection opening 12b of the injector 12 through which an injection quantity 18 of the injector 12 from the injector 12 outlet, to the return line 14 not done.)

The device 10 for return pressure adjustment also includes an electrically adjustable throttle valve 20 by which a return pressure at least between the first end 14a 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 as a defined pressure between the injector 12 and the electrically adjustable throttle valve 20 before.) The use of the electrically adjustable throttle valve 20 allows 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, also by means of the electrically adjustable throttle valve 20 the return pressure (at least between the first end 14a the return line and the electrically adjustable throttle valve 20 ) in the return line 14 optionally adjustable to each return pressure value of a set of values with at least two different return pressure values. Therefore, the device can 10 to set the return pressure setting for different types of injectors and different injector generations, even if their desired / predetermined desired return pressures differ from each other. A use of the device 10 For the return pressure adjustment therefore allows the above-mentioned advantages for cost reduction, set-up time savings and space reduction.

Preferably, the device comprises 10 for return pressure adjustment also one between the first end 14a the return line 14 and the electrically adjustable throttle valve 20 on the return line 14 connected pressure sensor 22 , In this case, also a regulation of the return pressure by means of a cooperation of the electrically adjustable throttle valve 20 and the pressure sensor 22 possible. In addition, the device 10 for return pressure adjustment also a (in 1 not shown) 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 a hydraulic proportional valve) for relatively 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 also a set of values of common target return pressures (at least between the first end 14a 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 controller 24 the device 10 for return pressure adjustment designed to at least one control signal 26 output with modulated pulse width for clocked control of the (diesel) common rail pressure control valve.

It is also advantageous if the electrically adjustable throttle valve 20 a high-pressure injector (or a gasoline high-pressure injector) is. To adjust / regulate the return pressure, the (gasoline) high-pressure injector of the control 24 by means of at least one control signal 26 be (eg a simple square wave signal) with modulated pulse width be controlled / controlled. A control of the (gasoline) high-pressure injector by means of complex control signals, which requires a complex output stage for generating the complex control signals, is not necessary.

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

In a further development of the device 10 for return pressure setting (as a measuring device for Einspritzmengen- 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 through the return line 14 flowing return flow 16 are measurable at the device 10 be formed to the return pressure setting. The device 10 for return pressure adjustment is thus versatile. The device 10 For example, the return pressure setting can be part of a test stand.

2 shows a schematic representation of an embodiment of the return block.

The in 2 Schematically represented return block is for examining / checking several injectors 12 used. For this purpose, the return block has several devices 10 to the return pressure setting on. Each of the devices 10 for return pressure adjustment comprises the components of the previously described embodiment. Only as optional developments, each of the devices 10 for return pressure setting still a filter 30 and one temperature sensor each 32 on. Each of the devices 10 for return pressure adjustment is designed to set / regulate the return pressure to each return pressure value of a set of values with at least two different return pressure values, the devices 10 for return pressure setting simultaneously different return pressures in their respective return line 14 (at least between the first end 14a the respective return line and the respective electrically adjustable throttle valve 20 ) can adjust / adjust at the same time. The return block of the 2 is therefore simultaneously usable for different injector types and different injector generations.

Preferably, the return block also has at least one controller 24 which is adapted to at least one control signal 26 output with modulated pulse width for clocked control of the 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. As in 2 is also shown, and the return block can 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 the return pressure setting and the return block allow for universal active pressure adjustment / control by using common automotive components rather than 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). Thus they contribute to increase a measuring accuracy when measuring the injection quantity 18 and / or the return amount 16 and to increase 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 additional equipment workshop area can be used elsewhere.

3 FIG. 12 is a flowchart for explaining one 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. For this purpose, the return pressure is adjusted by means of an electrically adjustable throttle valve at least 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 at least between the first end of the return line and the electrically variable throttle valve in the return line is set at a first return pressure value, while for a different type of second injector from the first type, the return pressure is at least between first end of the return line and the electrically adjustable throttle valve in the return line is set to a different / second return pressure value other than 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, simultaneous or temporally overlapping with the method step S1 another procedural step S2 be executed, 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 (12)

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 attachable 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 at least one valve (20) by means of which a return pressure is adjustable at least between the first end (14a) 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) comprises an electrically adjustable throttle valve (20) as the valve (20), wherein by means of the electrically adjustable throttle valve (20) of the 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. Device (10) for return pressure adjustment after Claim 1 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) 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 is adjustable. Device (10) for return pressure adjustment after Claim 1 or 2 wherein the electrically variable throttle valve (20) is a common rail pressure control valve or a diesel common rail pressure control valve. Device (10) for return pressure adjustment after Claim 1 or 2 wherein the electrically variable throttle valve (20) is a high pressure injector or a gasoline high pressure injector. Device (10) for return pressure adjustment after Claim 3 or 4 wherein the device (10) comprises a controller (24) which is adapted to at least one control signal (26) with modulated pulse width for clocked control of the common rail pressure control valve or diesel common rail pressure control valve or high pressure injector or Gasoline high-pressure injector issue. The return pressure setting device (10) according to any one of the preceding claims, wherein the device (10) includes a pressure sensor (22) connected between the first end (14a) of the return line (14) and the electrically adjustable throttle valve (20) on the return line (14). and / or a temperature sensor (32). 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 , Return block after Claim 3 and / or 4 and Claim 7 wherein the return block comprises at least one controller (24) which is designed to have at least one control signal (26) with modulated pulse width for clocked activation of the at least one associated common rail pressure regulating valve or diesel common rail pressure regulating valve or high pressure injection valve or gasoline high pressure injector. Measuring device for injection quantity and / or return flow measurement for at least one injector (12), comprising: at least one device (10) for setting the return pressure according to one of Claims 1 to 6 or a return block after Claim 7 or 8th ; and at least one injection quantity and / or return quantity sensor (28), by means of which an injection quantity (18) and / or the return flow (16) flowing through the associated return line (14) can be measured. Test bench for at least one injector (12) with a measuring device for injection quantity and / or return flow measurement after Claim 9 , Method for adjusting the return pressure on at least one injector (12), comprising the step of setting a return pressure by means of at least one valve (20) at least 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) from the first end (14a) of the return line (14) to a second end (14b) of the return line (14) flows, and the valve (20) in the return line (14); 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 (14) with the connected injector (12) and the electrically adjustable throttle valve (20) in the Return line (14) is set (S1). Method for return pressure adjustment after Claim 11 wherein, for a first type of injector (12), the return pressure is set to a first return pressure value at least between the first end (14a) of the return line (14) and the electrically variable throttle valve (20) in the return line (14) and for one of second return type of the injector (12), the return pressure is set at least between the first end (14a) of the return line (14) and the electrically variable throttle valve (20) in the return line (14) to a second return pressure value other than the first return pressure value ,

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