EP2295788A1 - Method and arrangement for determining a mass flow of an injection process of an injection valve - Google Patents

Method and arrangement for determining a mass flow of an injection process of an injection valve Download PDF

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Publication number
EP2295788A1
EP2295788A1 EP09010194A EP09010194A EP2295788A1 EP 2295788 A1 EP2295788 A1 EP 2295788A1 EP 09010194 A EP09010194 A EP 09010194A EP 09010194 A EP09010194 A EP 09010194A EP 2295788 A1 EP2295788 A1 EP 2295788A1
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EP
European Patent Office
Prior art keywords
test volume
valve
value
cut
injection
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Application number
EP09010194A
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German (de)
French (fr)
Inventor
Christiano Mannucci
Daniel Marc
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Continental Automotive GmbH
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Continental Automotive GmbH
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Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP09010194A priority Critical patent/EP2295788A1/en
Publication of EP2295788A1 publication Critical patent/EP2295788A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus

Definitions

  • the invention relates to a method and an arrangement for determining a mass flow of an injection process of an injection valve.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example the range of up to 200 bar or in the case of diesel engines in the range of up to 2,000 bar.
  • the injection of fluids under such high pressures has to be carried out very precisely.
  • the objects of the invention is to create a method and an arrangement for determining a mass flow of an injection process of an injection valve which are simply to be carried out and manufactured and which allow an exact determination of the mass flow of an injection process of an injection valve even in the case of a shot-to-shot injection.
  • the invention is distinguished by a method for determining a mass flow of an injection process of an injection valve.
  • An arrangement comprises a test volume and a cut-off valve.
  • the test volume is hydraulically arranged between the injection valve and the cut-off valve.
  • the cut-off valve is hydraulically coupled to a fluid line.
  • the method comprises the following steps: opening the cut-off valve while the injection valve is closed to establish a fluid communication between the test volume and the fluid line, closing the cut-off valve to obtain a constant pressure in the test volume, determining a first value of the pressure in the test volume, opening the injection valve while the cut-off valve is closed to establish an injection process, closing the injection valve to obtain a constant pressure in the test volume, determining a second value of the pressure in the test volume, determining the value of the pressure difference between the first value and the second value of the pressure in the test volume, and determining the mass flow of the injection process of the injection valve depending on the value of the pressure difference in the test volume.
  • the method may be used for measuring a plurality of injection valves in one combustion engine in a very simple manner. This allows the use of simple plug-and-play systems. Additionally, the method may be carried out without particular automatic software routines for the calculation of the mass flow. Consequently, the costs for determining the mass flow of the injection process of the injection valve may be very low.
  • a fluid flow from the fluid line to the test volume is established.
  • a fluid flow out from the test volume is established.
  • a fluid flow from the test volume to the fluid line is established.
  • a fluid flow into the test volume is established.
  • At least one value of the temperature in the test volume is determined.
  • an arrangement for determining a mass flow of an injection process of an injection valve comprises a test volume and a cut-off valve.
  • the cut-off valve is arranged upstream the test volume.
  • the cut-off valve is designed to be arranged downstream a fluid supply.
  • the test volume is designed to be arranged upstream the injection valve.
  • the arrangement is designed to open the cut-off valve while the injection valve is closed to establish a fluid flow from the fluid supply to the test volume, to close the cut-off valve to obtain a constant pressure in the test volume, to determine a first value of the pressure in the test volume, to open the injection valve while the cut-off valve is closed to establish the injection process, to close the injection valve to obtain a constant pressure in the test volume, to determine a second value of the pressure in the test volume, to determine the value of the pressure difference between the first value and the second value of the pressure in the test volume, to determine the mass flow of the injection process of the injection valve depending on the value of the pressure difference in the test volume.
  • an arrangement for determining a mass flow of an injection process of an injection valve comprises a test volume and a cut-off valve.
  • the cut-off valve is arranged downstream the test volume, the cut-off valve is designed to be arranged upstream a fluid line, and the test volume is designed to be arranged downstream the injection valve.
  • the arrangement is designed to open the cut-off valve while the injection valve is closed to establish a fluid communication from the test volume to the fluid line, to close the cut-off valve to obtain a constant pressure in the test volume, to determine a first value of the pressure in the test volume, to open the injection valve while the cut-off valve is closed to establish a fluid flow into the test volume, to close the injection valve to obtain a constant pressure in the test volume, to determine a second value of the pressure in the test volume, to determine the value of the pressure difference between the first value and the second value of the pressure in the test volume, to determine the mass flow of the injection process of the injection valve depending on the value of the pressure difference in the test volume.
  • a fuel feed device 10 is assigned to an internal combustion engine 2 ( figure 1 ) which can be a diesel engine or a gasoline engine. It includes a fuel tank 12 that is connected via a first fuel line to a fuel pump 14. The output of the fuel pump 14 is connected to a fuel inlet 16 of a fuel rail 18. In the fuel rail 18, the fuel is stored for example under a pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine. Injection valves 20 are connected to the fuel rail 18 and the fuel is fed to the injection valves 20 via the fuel rail 18.
  • Figure 2 shows a first embodiment of an arrangement for determining a mass flow MFF of an injection process of the injection valve 20.
  • the arrangement comprises the injection valve 20, a test volume 22, a cut-off valve 24, a fluid line 26, a pressure sensor 28 and a temperature sensor 30.
  • the fluid line 26 comprises the fuel rail 18.
  • the test volume 22 is arranged upstream the injection valve 20.
  • the cut-off valve 24 is arranged upstream the test volume 22 and downstream the fluid line 26 which is designed as a fluid supply.
  • the pressure sensor 28 and the temperature sensor 30 are arranged and designed to determine a pressure p and a temperature T of the fluid inside the test volume 22.
  • Figure 3 shows a representation of the course of the pressure p over a time t during an execution of the method for determining the mass flow MFF of the injection process of the injection valve 20 which will be explained in context with Figure 6 .
  • Figure 4 shows a further embodiment of the arrangement for determining the mass flow MFF of an injection process of the injection valve 20.
  • the test volume 22 is arranged downstream the injection valve 20, and the cut-off valve 24 is arranged downstream the test volume 22, and upstream the fluid line 26.
  • the pressure sensor 28 and the temperature sensor 20 are arranged and designed to determine the pressure p and the temperature T of the fluid inside the test volume 22.
  • Figure 5 shows a further chart of the course of the pressure p over the time t inside the test volume 22 during an execution of the method for determining the mass flow MFF of the injection process of the injection valve 20 which will be explained later in context with Figure 7 .
  • Figure 6 shows a flow chart disclosing the process for determining the mass flow MFF of the injection process of the injection valve 20 according to a first embodiment.
  • step S10 The process for determining the mass flow MFF starts in step S10.
  • a step S12 the cut-off valve 24 and the injection valve 20 are closed, hence the test volume 22 is completely cut off.
  • a step S14 the cut-off valve 24 is opened and the injection valve 20 remains closed. By this a fluid communication between the fluid line 26 and the test volume 22 is established. This is represented by a time period TIME_1 in Figure 3 .
  • step S16 the cut-off valve 24 is closed, and a constant pressure can be obtained in the test volume 22.
  • a first value P_1 of the pressure in the test volume 22 is determined, preferably by the pressure sensor 28. This is represented by a time period TIME_2 in Figure 3 .
  • step S20 the injection valve 20 is opened and the cut-off valve 24 remains closed so that an injection process can be carried out. This is represented by a time period TIME_3 in Figure 3 .
  • step S22 the injection valve 20 is closed. By this a constant pressure in the test volume 22 can be obtained.
  • a second value P_2 of the pressure in the test volume 22 is determined. This is represented by a time period TIME_4 in Figure 3 .
  • a value ⁇ P of the pressure difference between the first value P_1 and the second value P_2 of the pressure in the test volume 22 is determined.
  • a further step S27 which is facultative one or a plurality of values T_1, T_2 of the temperature in the test volume 22 can be determined.
  • this step is carried out during the determination of the first value P1 of the pressure and/or the second value P_2 of the pressure in the test volume 22.
  • the mass flow MFF of the injection process of the injection valve 20 is determined.
  • the mass flow MFF is depending on the value ⁇ P of the pressure difference in the test volume 22.
  • the mass flow MFF may be dependent on a media density and a media compressibility of the fluid inside the test volume 22.
  • the media density and the media compressibility of the fluid inside the test volume 22 may be determined as a function of the temperatures T_1, T_2.
  • the media compressibility and the media density of the fluid inside the test volume 22 may be constant values.
  • step S30 the process is stopped.
  • the described embodiment of the arrangement and the method is also called “upstream installation” for determining the mass flow MFF of the injection process of the injection valve 20.
  • step S110 The process for determining the mass flow MFF is started in step S110.
  • a step 112 the injection valve 20 and the cut-off valve 24 are closed to obtain a completely cut-off test volume 22.
  • step S114 the cut-off valve 24 is opened and the injection valve 20 remains closed.
  • a fluid communication between the test volume 22 and the fluid line 26 is established and fluid can flow out from the test volume 22. This is represented by a time period TIME_11 in Figure 5 .
  • a further step 116 the cut-off valve 24 is closed. By this a constant pressure in the test volume 22 can be obtained.
  • step S118 the first value P_1 of the pressure in the test volume 22 is determined, preferably by the pressure sensor 28. This is represented by a time period TIME_12 in Figure 5 .
  • step S120 the injection valve 20 is opened and the cut-off valve 24 remains closed.
  • an injection process from the injection valve 20 into the test volume 22 is established. This is represented by a time period TIME_13 in Figure 5 .
  • step S122 the injection valve 20 is closed. By this a constant pressure in the test volume 22 can be obtained.
  • a second value P_2 of the pressure in the test volume 22 is determined. This is represented by a time period TIME_14 in Figure 5 .
  • step S126 the value ⁇ P of the pressure difference between the first value P_1 and the second value P_2 of the pressure in the test volume 22 is determined.
  • step S127 which is facultative, values T_1, T_2 of the temperature and the test volume 22 can be determined.
  • this step is carried out during the determination of the first value P_1 of the pressure and/or the second value P_2 of the pressure in the test volume 22.
  • the mass flow MFF of the injection process of the injection valve 20 is determined dependent on the value ⁇ P of the pressure difference in the test volume 22.
  • the mass flow MFF is furthermore determined depending on the values T_1, T_2 of the temperatures in the test volume 22.
  • step S130 the process for determining the mass flow of an injection process of the injection valve 20 is stopped.
  • the cut-off valve 24 is carried out as a draining valve, and the fluid line 26 is hydraulically coupled to the fuel tank 12.
  • the described methods and arrangements have the advantage that they can be used in a very large media temperature range limited by the allowed temperature range of the pressure sensors.
  • the temperature range of the pressure sensors is from -40°C to 150°C.
  • a further advantage of the described method and arrangement is that a very large temperature range of the ambient temperature can be used, in particular an ambient temperature range from -40°C to 130°C.
  • a further advantage of the described method and arrangement is that it can be used for measuring multiple injection valves which are installed on a fuel rail assembly.
  • a plurality of injection valves can be used. For example, for a four cylinder system it is possible to determine the mass flow of each injection valve during a revolution of the combustion engine.
  • an instantaneous flow rate of the injection valves can be obtained.
  • the measurement for determining the mass flow MFF allows obtaining the instantaneous flow rate of the injection valve 20.
  • the method for determining the mass flow MFF of the injection valves 20 can be used for gasoline and diesel injectors. It is also possible to measure further systems that generate an impulsive and non-constant flow rate like solenoid digital valves installed at an inlet of single piston pumps.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

An arrangement comprises a test volume (22) and a cut-off valve (24). The test volume (22) is hydraulically arranged between the injection valve (20) and the cut-off valve (24). The cut-off valve (24) is hydraulically coupled to a fluid line (26).
The method comprises the following steps:
- opening the cut-off valve (24) while the injection valve (20) is closed,
- closing the cut-off valve (24),
- determining a first value (P_1) of the pressure in the test volume (22),
- opening the injection valve (20) while the cut-off valve (24) is closed,
- closing the injection valve (20),
- determining a second value (P_2) of the pressure in the test volume (22),
- determining the value (ΔP) of the pressure difference between the first value (P_1) and the second value (P_2), and
- determining the mass flow (MFF) of the injection process of the injection valve (20) depending on the value (ΔP) of the pressure difference in the test volume (22).

Description

  • The invention relates to a method and an arrangement for determining a mass flow of an injection process of an injection valve.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • In order to keep pressure fluctuations during the operation of the internal combustion engine at a very low level, internal combustion engines are supplied with a fuel accumulator to which the injection valves are connected and which has a relatively large volume.
  • In order to enhance the combustion process in view of the creation of unwanted emissions, the respective injection valve may be suited to dose fluids under very high pressures. The pressures may be in case of a gasoline engine, for example the range of up to 200 bar or in the case of diesel engines in the range of up to 2,000 bar. The injection of fluids under such high pressures has to be carried out very precisely.
  • The objects of the invention is to create a method and an arrangement for determining a mass flow of an injection process of an injection valve which are simply to be carried out and manufactured and which allow an exact determination of the mass flow of an injection process of an injection valve even in the case of a shot-to-shot injection.
  • The objects are achieved by the features of the independent claims. Advantageous embodiments of the invention are given in the sub-claims.
  • The invention is distinguished by a method for determining a mass flow of an injection process of an injection valve. An arrangement comprises a test volume and a cut-off valve. The test volume is hydraulically arranged between the injection valve and the cut-off valve. The cut-off valve is hydraulically coupled to a fluid line. The method comprises the following steps: opening the cut-off valve while the injection valve is closed to establish a fluid communication between the test volume and the fluid line, closing the cut-off valve to obtain a constant pressure in the test volume, determining a first value of the pressure in the test volume, opening the injection valve while the cut-off valve is closed to establish an injection process, closing the injection valve to obtain a constant pressure in the test volume, determining a second value of the pressure in the test volume, determining the value of the pressure difference between the first value and the second value of the pressure in the test volume, and determining the mass flow of the injection process of the injection valve depending on the value of the pressure difference in the test volume.
  • This has the advantage that an instantaneous determination of the mass flow of the injection valve is possible. Furthermore, an exact determination of the mass flow of an injection process of an injection valve in the case of a shot-to-shot injection is possible. Furthermore, the method may be used for measuring a plurality of injection valves in one combustion engine in a very simple manner. This allows the use of simple plug-and-play systems. Additionally, the method may be carried out without particular automatic software routines for the calculation of the mass flow. Consequently, the costs for determining the mass flow of the injection process of the injection valve may be very low.
  • In an advantageous embodiment during the opening of the cut-off valve a fluid flow from the fluid line to the test volume is established. During the opening of the injection valve a fluid flow out from the test volume is established.
  • In a further advantageous embodiment during the opening of the cut-off valve a fluid flow from the test volume to the fluid line is established. During the opening of the injection valve a fluid flow into the test volume is established.
  • In a further advantageous embodiment during the determination of the first value of the pressure and/or the second value of the pressure in the test volume at least one value of the temperature in the test volume is determined. By this an exact determination of the density of the fluid and the compressibility of the fluid and consequently, an exact determination of the mass flow of the injection valve is possible.
  • According to a second aspect of the invention an arrangement for determining a mass flow of an injection process of an injection valve comprises a test volume and a cut-off valve. The cut-off valve is arranged upstream the test volume. The cut-off valve is designed to be arranged downstream a fluid supply. The test volume is designed to be arranged upstream the injection valve. The arrangement is designed to open the cut-off valve while the injection valve is closed to establish a fluid flow from the fluid supply to the test volume, to close the cut-off valve to obtain a constant pressure in the test volume, to determine a first value of the pressure in the test volume, to open the injection valve while the cut-off valve is closed to establish the injection process, to close the injection valve to obtain a constant pressure in the test volume, to determine a second value of the pressure in the test volume, to determine the value of the pressure difference between the first value and the second value of the pressure in the test volume, to determine the mass flow of the injection process of the injection valve depending on the value of the pressure difference in the test volume.
  • According to a third aspect of the invention an arrangement for determining a mass flow of an injection process of an injection valve comprises a test volume and a cut-off valve. The cut-off valve is arranged downstream the test volume, the cut-off valve is designed to be arranged upstream a fluid line, and the test volume is designed to be arranged downstream the injection valve. The arrangement is designed to open the cut-off valve while the injection valve is closed to establish a fluid communication from the test volume to the fluid line, to close the cut-off valve to obtain a constant pressure in the test volume, to determine a first value of the pressure in the test volume, to open the injection valve while the cut-off valve is closed to establish a fluid flow into the test volume, to close the injection valve to obtain a constant pressure in the test volume, to determine a second value of the pressure in the test volume, to determine the value of the pressure difference between the first value and the second value of the pressure in the test volume, to determine the mass flow of the injection process of the injection valve depending on the value of the pressure difference in the test volume.
  • Exemplary embodiments of the invention are explained in the following with the aid of schematic drawings. These are as follows:
    • Figure 1 an internal combustion engine in a schematic view,
    • Figure 2 an arrangement for determining a mass flow of an injection process of an injection valve,
    • Figure 3 a representation of a method for determining a mass flow of an injection process of an injection valve,
    • Figure 4 a further arrangement for determining a mass flow of an injection process of an injection valve,
    • Figure 5 a further representation of the method for determining a mass flow of an injection process of an injection valve,
    • Figure 6 a flow chart of the method for determining a mass flow of an injection process of an injection valve,
    • Figure 7 a further flow chart of the method for determining a mass flow of an injection process of an injection valve.
  • Elements of the same design and function that occur in different illustrations are identified by the same reference character.
  • A fuel feed device 10 is assigned to an internal combustion engine 2 (figure 1) which can be a diesel engine or a gasoline engine. It includes a fuel tank 12 that is connected via a first fuel line to a fuel pump 14. The output of the fuel pump 14 is connected to a fuel inlet 16 of a fuel rail 18. In the fuel rail 18, the fuel is stored for example under a pressure of about 200 bar in the case of a gasoline engine or of about 2,000 bar in the case of a diesel engine. Injection valves 20 are connected to the fuel rail 18 and the fuel is fed to the injection valves 20 via the fuel rail 18.
  • Figure 2 shows a first embodiment of an arrangement for determining a mass flow MFF of an injection process of the injection valve 20. The arrangement comprises the injection valve 20, a test volume 22, a cut-off valve 24, a fluid line 26, a pressure sensor 28 and a temperature sensor 30. The fluid line 26 comprises the fuel rail 18. The test volume 22 is arranged upstream the injection valve 20. The cut-off valve 24 is arranged upstream the test volume 22 and downstream the fluid line 26 which is designed as a fluid supply. The pressure sensor 28 and the temperature sensor 30 are arranged and designed to determine a pressure p and a temperature T of the fluid inside the test volume 22.
  • Figure 3 shows a representation of the course of the pressure p over a time t during an execution of the method for determining the mass flow MFF of the injection process of the injection valve 20 which will be explained in context with Figure 6.
  • Figure 4 shows a further embodiment of the arrangement for determining the mass flow MFF of an injection process of the injection valve 20. The test volume 22 is arranged downstream the injection valve 20, and the cut-off valve 24 is arranged downstream the test volume 22, and upstream the fluid line 26. The pressure sensor 28 and the temperature sensor 20 are arranged and designed to determine the pressure p and the temperature T of the fluid inside the test volume 22.
  • Figure 5 shows a further chart of the course of the pressure p over the time t inside the test volume 22 during an execution of the method for determining the mass flow MFF of the injection process of the injection valve 20 which will be explained later in context with Figure 7.
  • Figure 6 shows a flow chart disclosing the process for determining the mass flow MFF of the injection process of the injection valve 20 according to a first embodiment.
  • The process for determining the mass flow MFF starts in step S10.
  • In a step S12 the cut-off valve 24 and the injection valve 20 are closed, hence the test volume 22 is completely cut off.
  • In a step S14 the cut-off valve 24 is opened and the injection valve 20 remains closed. By this a fluid communication between the fluid line 26 and the test volume 22 is established. This is represented by a time period TIME_1 in Figure 3.
  • In a further step S16, the cut-off valve 24 is closed, and a constant pressure can be obtained in the test volume 22.
  • In a further step S18 a first value P_1 of the pressure in the test volume 22 is determined, preferably by the pressure sensor 28. This is represented by a time period TIME_2 in Figure 3.
  • In a further step S20 the injection valve 20 is opened and the cut-off valve 24 remains closed so that an injection process can be carried out. This is represented by a time period TIME_3 in Figure 3.
  • In a further step S22 the injection valve 20 is closed. By this a constant pressure in the test volume 22 can be obtained.
  • In a further step S24 a second value P_2 of the pressure in the test volume 22 is determined. This is represented by a time period TIME_4 in Figure 3.
  • In a further step S26 a value ΔP of the pressure difference between the first value P_1 and the second value P_2 of the pressure in the test volume 22 is determined.
  • In a further step S27 which is facultative one or a plurality of values T_1, T_2 of the temperature in the test volume 22 can be determined. Preferably, this step is carried out during the determination of the first value P1 of the pressure and/or the second value P_2 of the pressure in the test volume 22.
  • In a further step 28 the mass flow MFF of the injection process of the injection valve 20 is determined. The mass flow MFF is depending on the value ΔP of the pressure difference in the test volume 22. Furthermore, the mass flow MFF may be dependent on a media density and a media compressibility of the fluid inside the test volume 22. Preferably, the media density and the media compressibility of the fluid inside the test volume 22 may be determined as a function of the temperatures T_1, T_2. Alternatively, the media compressibility and the media density of the fluid inside the test volume 22 may be constant values.
  • In a further step S30 the process is stopped.
  • The described embodiment of the arrangement and the method is also called "upstream installation" for determining the mass flow MFF of the injection process of the injection valve 20.
  • In Figure 7 a further embodiment of the method for determining a mass flow MFF of an injection process of the injection valve 20 is described with the aid of a flow chart.
  • The process for determining the mass flow MFF is started in step S110.
  • In a step 112 the injection valve 20 and the cut-off valve 24 are closed to obtain a completely cut-off test volume 22.
  • In a further step S114 the cut-off valve 24 is opened and the injection valve 20 remains closed. By this a fluid communication between the test volume 22 and the fluid line 26 is established and fluid can flow out from the test volume 22. This is represented by a time period TIME_11 in Figure 5.
  • In a further step 116 the cut-off valve 24 is closed. By this a constant pressure in the test volume 22 can be obtained.
  • In a further step S118 the first value P_1 of the pressure in the test volume 22 is determined, preferably by the pressure sensor 28. This is represented by a time period TIME_12 in Figure 5.
  • In a further step S120 the injection valve 20 is opened and the cut-off valve 24 remains closed. By this an injection process from the injection valve 20 into the test volume 22 is established. This is represented by a time period TIME_13 in Figure 5.
  • In a further step S122 the injection valve 20 is closed. By this a constant pressure in the test volume 22 can be obtained.
  • In a further step S124 a second value P_2 of the pressure in the test volume 22 is determined. This is represented by a time period TIME_14 in Figure 5.
  • In a further step S126 the value ΔP of the pressure difference between the first value P_1 and the second value P_2 of the pressure in the test volume 22 is determined.
  • In a further step S127, which is facultative, values T_1, T_2 of the temperature and the test volume 22 can be determined. Preferably, this step is carried out during the determination of the first value P_1 of the pressure and/or the second value P_2 of the pressure in the test volume 22.
  • In a further S128 the mass flow MFF of the injection process of the injection valve 20 is determined dependent on the value ΔP of the pressure difference in the test volume 22. Preferably, the mass flow MFF is furthermore determined depending on the values T_1, T_2 of the temperatures in the test volume 22. By this, a very exact determination of the media compressibility and the media density can be obtained. Alternatively, the media compressibility and the media density of the fluid inside the test volume 22 may be constant values.
  • In a further step S130 the process for determining the mass flow of an injection process of the injection valve 20 is stopped.
  • The method and the arrangement described in Figures 4, 5 and 7 is also called "downstream installation" for determining the mass flow MFF of the injection process of the injection valve 20.
  • Preferably, in this case the cut-off valve 24 is carried out as a draining valve, and the fluid line 26 is hydraulically coupled to the fuel tank 12.
  • The described methods and arrangements have the advantage that they can be used in a very large media temperature range limited by the allowed temperature range of the pressure sensors. Preferably, the temperature range of the pressure sensors is from -40°C to 150°C.
  • A further advantage of the described method and arrangement is that a very large temperature range of the ambient temperature can be used, in particular an ambient temperature range from -40°C to 130°C.
  • A further advantage of the described method and arrangement is that it can be used for measuring multiple injection valves which are installed on a fuel rail assembly. A plurality of injection valves can be used. For example, for a four cylinder system it is possible to determine the mass flow of each injection valve during a revolution of the combustion engine.
  • Furthermore, an instantaneous flow rate of the injection valves can be obtained. The measurement for determining the mass flow MFF allows obtaining the instantaneous flow rate of the injection valve 20.
  • Furthermore, the method for determining the mass flow MFF of the injection valves 20 can be used for gasoline and diesel injectors. It is also possible to measure further systems that generate an impulsive and non-constant flow rate like solenoid digital valves installed at an inlet of single piston pumps.
  • Additionally, all the parts which are in contact with the fluid can be carried out in stainless steel and no elastomer sealing elements are necessary. Consequently, worldwide fuel compatibility is possible.
  • It is furthermore possible to carry out the method without particular automatic software routines for the mass flow calculation or particular pressure point identification and statistic analysis. This allows the use of simple plug-and-play systems.
  • Finally, the costs for the arrangement for determining the mass flow MFF of the injection process of the injection valve are very low.

Claims (6)

  1. Method for determining a mass flow (MFF) of an injection process of an injection valve (20), with an arrangement comprising a test volume (22) and a cut-off valve (24), the test volume (22) being hydraulically arranged between the injection valve (20) and the cut-off valve (24), and the cut-off valve (24) being hydraulically coupled to a fluid line (26),
    the method comprising the following steps:
    - opening the cut-off valve (24) while the injection valve (20) is closed to establish a fluid communication between the test volume (22) and the fluid line (26),
    - closing the cut-off valve (24) to obtain a constant pressure in the test volume (22),
    - determining a first value (P_1) of the pressure in the test volume (22),
    - opening the injection valve (20) while the cut-off valve (24) is closed to establish an injection process,
    - closing the injection valve (20) to obtain a constant pressure in the test volume (22),
    - determining a second value (P_2) of the pressure in the test volume (22),
    - determining the value (ΔP) of the pressure difference between the first value (P_1) and the second value (P_2) of the pressure in the test volume (22), and
    - determining the mass flow (MFF) of the injection process of the injection valve (20) depending on the value (ΔP) of the pressure difference in the test volume (22).
  2. Method for determining the mass flow (MFF) in accordance with claim 1, wherein
    - during the opening of the cut-off valve (24) a fluid flow from the fluid line (26) to the test volume (22) is established, and
    - during the opening of the injection valve (20) a fluid flow out from the test volume (22) is established.
  3. Method for determining the mass flow (MFF) in accordance with claim 1,
    - during the opening of the cut-off valve (24) a fluid flow from the test volume (22) to the fluid line (26) is established, and
    - during the opening of the injection valve (20) a fluid flow into the test volume (22) is established.
  4. Method for determining the mass flow (MFF) in accordance with one of the preceding claims, wherein during the determination of the first value (P_1) of the pressure and/or the second value (P_2) of the pressure in the test volume (22) at least one value (T_1, T_2) of the temperature in the test volume (22) is determined.
  5. Arrangement for determining a mass flow (MFF) of an injection process of an injection valve (20), the arrangement comprising a test volume (22) and a cut-off valve (24), the cut-off valve (24) being arranged upstream the test volume (22), the cut-off valve (24) being designed to be arranged downstream a fluid supply, and the test volume (22) being designed to be arranged upstream the injection valve (20), the arrangement being designed
    - to open the cut-off valve (24) while the injection valve (20) is closed to establish a fluid flow from the fluid supply to the test volume (22),
    - to close the cut-off valve (24) to obtain a constant pressure in the test volume (22),
    - to determine a first value (P_1) of the pressure in the test volume (22),
    - to open the injection valve (20) while the cut-off valve (24) is closed to establish the injection process,
    - to close the injection valve (20) to obtain a constant pressure in the test volume (22),
    - to determine a second value (P_2) of the pressure in the test volume (22),
    - to determine the value (ΔP) of the pressure difference between the first value (P_1) and the second value (P_2) of the pressure in the test volume (22),
    - to determine the mass flow (MFF) of the injection process of the injection valve (20) depending on the value (ΔP) of the pressure difference in the test volume (22).
  6. Arrangement for determining a mass flow (MFF) of an injection process of an injection valve (20), the arrangement comprising a test volume (22) and a cut-off valve (24), the cut-off valve (24) being arranged downstream the test volume (22),the cut-off valve (24) being designed to be arranged upstream a fluid line (26), and the test volume (22) being designed to be arranged downstream the injection valve (20), the arrangement being designed
    - to open the cut-off valve (24) while the injection valve (20) is closed to establish a fluid communication from the test volume (22) to the fluid line (26),
    - to close the cut-off valve (24) to obtain a constant pressure in the test volume (22),
    - to determine a first value (P_1) of the pressure in the test volume (22),
    - to open the injection valve (20) while the cut-off valve (24) is closed to establish a fluid flow into the test volume (22),
    - to close the injection valve (20) to obtain a constant pressure in the test volume (22),
    - to determine a second value (P_2) of the pressure in the test volume (22),
    - to determine the value (ΔP) of the pressure difference between the first value (P_1) and the second value (P_2) of the pressure in the test volume (22),
    - to determine the mass flow (MFF) of the injection process of the injection valve (20) depending on the value (ΔP) of the pressure difference in the test volume (22).
EP09010194A 2009-08-06 2009-08-06 Method and arrangement for determining a mass flow of an injection process of an injection valve Withdrawn EP2295788A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09010194A EP2295788A1 (en) 2009-08-06 2009-08-06 Method and arrangement for determining a mass flow of an injection process of an injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09010194A EP2295788A1 (en) 2009-08-06 2009-08-06 Method and arrangement for determining a mass flow of an injection process of an injection valve

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EP2295788A1 true EP2295788A1 (en) 2011-03-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019166181A1 (en) * 2018-03-02 2019-09-06 Robert Bosch Gmbh Method and apparatus for calibrating a pulsating gas throughflow
DE102018203542A1 (en) * 2018-03-08 2019-09-12 Volkswagen Aktiengesellschaft Method for diagnosing an injection device for an internal combustion engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS614860A (en) * 1984-06-16 1986-01-10 Mitsubishi Heavy Ind Ltd Injection-rate meter
DE4130394A1 (en) * 1990-09-13 1992-03-19 Nippon Denso Co Fuel injection quantity measuring appts. - measures pressure changes of fluid in container into which fluid is injected
EP1148327A1 (en) * 2000-04-14 2001-10-24 Assembly Technology & Test Limited ( Injector valve ) monitoring equipment with pressure measuring time selection
WO2004040129A1 (en) * 2002-10-25 2004-05-13 Robert Bosch Gmbh Method and device for measuring the injection rate of an injection valve for liquids
DE102007028900A1 (en) * 2007-06-22 2008-12-24 Continental Automotive Gmbh Method and device for diagnosing an injection valve of an internal combustion engine that is in communication with a fuel rail

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS614860A (en) * 1984-06-16 1986-01-10 Mitsubishi Heavy Ind Ltd Injection-rate meter
DE4130394A1 (en) * 1990-09-13 1992-03-19 Nippon Denso Co Fuel injection quantity measuring appts. - measures pressure changes of fluid in container into which fluid is injected
EP1148327A1 (en) * 2000-04-14 2001-10-24 Assembly Technology & Test Limited ( Injector valve ) monitoring equipment with pressure measuring time selection
WO2004040129A1 (en) * 2002-10-25 2004-05-13 Robert Bosch Gmbh Method and device for measuring the injection rate of an injection valve for liquids
DE102007028900A1 (en) * 2007-06-22 2008-12-24 Continental Automotive Gmbh Method and device for diagnosing an injection valve of an internal combustion engine that is in communication with a fuel rail

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019166181A1 (en) * 2018-03-02 2019-09-06 Robert Bosch Gmbh Method and apparatus for calibrating a pulsating gas throughflow
DE102018203542A1 (en) * 2018-03-08 2019-09-12 Volkswagen Aktiengesellschaft Method for diagnosing an injection device for an internal combustion engine

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