• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for checking whether an electromagnetically actuated gas injection valve (1) arranged in an internal combustion engine between a fuel source and a combustion chamber is in its closed end position, comprising subjecting the gas injection valve (1) to an electrical test voltage and measuring it by the electrical test voltage caused discharge current (I).
    公开号:AT510600A4
    申请号:T841/2011
    申请日:2011-06-07
    公开日:2012-05-15
    发明作者:
    申请人:Ge Jenbacher Gmbh & Co Ohg；
    IPC主号:
    专利说明:

    • * * m 69407 36 / fr
    The present invention relates to a method for checking the presence of a correct end position of an electromagnetically actuated gas injection valve arranged in an internal combustion engine between a fuel source and a combustion chamber.
    In addition, the invention relates to an internal combustion engine with a motor control, a source of gaseous fuel, at least one combustion chamber in which the gaseous fuel is ignited and disposed between the source of gaseous fuel and the at least one combustion chamber, electromagnetically actuated Gaseinblaseventil.
    Electromagnetically actuated gas injection valves are movable into an open end position by applying a corresponding electrical opening voltage and the resulting opening current flowing from a closed end position in which they interrupt the connection between the fuel source and the combustion chamber. The return of the Gaseinblaseventile in the closed end position is preferably carried out mechanically by a spring in the valve.
    When the gas injection valve is not completely closed due to a defect or a foreign matter, gaseous fuel (hereinafter referred to as "gas") may flow through the gas injection valve at an undesired time and / or in an undesirable amount. By flowing into the combustion chamber gas and the local mixing with air can form an ignitable mixture at a time not intended for this purpose. In addition, it may come to a lower lambda value of the mixture in the combustion chamber than desired (too rich mixture), as more gas flows as intended in the combustion chamber. In both cases, damage to the internal combustion engine by an unwanted or uncontrolled combustion may occur.
    Various methods have already become known which detect whether the gas injection valve is in its open end position. If the gas injection valve is in its open limit position at the time of checking,
    69407 36 / fr although it should be closed on schedule at this time, it can be concluded that there is a faulty gas injection valve.
    A disadvantage of such methods is that at least one combustion cycle takes place between the occurrence of the faulty valve position and the detection of this state. This one combustion cycle can already damage the engine.
    The object of the invention is to provide an improved method for detecting an unwanted opening state of the gas injection valve.
    This object is achieved by a method having the features of claim 1 and an internal combustion engine having the features of claim 11. Further advantageous embodiments of the invention are defined in the dependent claims.
    In the invention, therefore, in contrast to the prior art, not the review of the open end position but the review of the closed end position of the gas injection valve is provided.
    The check of the presence of the closed end position includes subjecting the gas injection valve to an electrical test voltage resulting in a test current. After switching off the test voltage, a measurement of the occurring discharge current takes place.
    This occurs at any time when the gas injection valve should be closed, but preferably in the period between the predetermined valve closing time and the planned ignition timing.
    In the case of electromagnetically actuated gas injection valves, an iron core movably mounted in a magnetic coil is provided for opening and closing the gas injection valve. Due to the movement of the iron core and the resulting change in the air gap in the magnetic circuit when opening and closing the Gaseinblaseventils the inductance of the solenoid changes. This changes
    69407 36 / itself the course of the discharge current generated by the electrical test voltage. The invention thus makes use of the fact that the inductance of the magnetic coil depends on the position of the iron core in the coil, the further the gas injection valve is removed from its closed end position, the further the iron core protrudes from the coil.
    The test current applied by the electrical test voltage can preferably be selected so that the supplied electrical energy is insufficient for lifting the gas injection valve from the valve seat. It is therefore possible to check at a time at which the gas injection valve should be (and should remain) as planned by the mechanical spring force in its closed end position. This has the advantage that it can be concluded directly on a faulty valve position, even before it comes to a planned ignition in the blaze. Therefore, it is possible to react to an incorrect valve position even before the mixture ignites in the combustion chamber, and the ignition spark can be suppressed so that no uncontrolled combustion takes place.
    On the measured course of the discharge current can be applied in the engine control of the internal combustion engine various mathematical techniques (all the expert are known) to obtain a reading for the valve position, for example: • Determination of the slope of the discharge current • Measurement of the absolute current value a certain time • Determination of the integral of the curve of the discharge current • Calculation of the inductance or the impedance from the temporal current course according to the relationship l (t) = lmax * exp (-R * t / L)
    These mathematical techniques can be applied to the region of increasing charge current and / or the region of decreasing discharge current.
    The invention also makes it possible to distinguish between defective and worn gas injection valves, namely in that the charging is carried out. »« Is carried out with the electrical test voltage at least twice, which allows the determination of the time of and / or the time required to reach (s) the closed end position of the Gaseinblaseventils.
    The wear of the gas injection valves used is characterized by a shift in the time at which the closed end position is reached. By a first measurement immediately after the closing time of a new solenoid valve and any number, but at least one further measurement (s) (after defined periods delayed for the first measurement), the timing of the closing operation can be determined. Based on these measurements, the actual closing time can be determined. By this closing time, the gas flow rate can be determined by the valve and this flow into the scheme or damage to the engine can be prevented at a large amount of gas.
    The advantage of a repeated measurement is thus in the determination of the time at which the closed end position is reached (in contrast to detecting that the closed end position was reached at all, in the case of a single measurement), Thus, a dangerous condition can be determined more accurately and the internal combustion engine are operated longer with worn valves and thus the availability of the internal combustion engine can be increased.
    The invention is particularly preferably provided in such internal combustion engines, which are designed as stationary Otto gas engines, in particular for power generation.
    Further advantages and details of the invention will become apparent from the figures and the accompanying description. Showing:
    1 schematically shows the structure of an electromagnetically actuated Gaseinblaseventils,
    2 curves of the discharge current over time for different valve positions,
    Fig. 3 Results of different evaluation methods and * * • # 69407 36 / fr
    4 shows a representation of the detection of different closing times of the gas injection valve.
    Fig. 1 shows schematically the electrical equivalent circuit diagram of an electromagnetically actuated Gaseinblaseventils 1. The arrangement of coil, iron core and associated valve head is generally designated by the reference numeral 2 and corresponds fully to the prior art. The reference numeral 5 denotes a capacitor for power supply. Preferably, the application of an electrical voltage is required only for the opening of the gas injection valve 1. The closing can be done by a mechanical energy storage (spring).
    A controller 3 of the Gaseinblaseventils 1 is connected to an engine control unit 4 of the internal combustion engine, which is designed so that they at least a time at which the Gaseinblaseventil should be in a closed end position, by the controller 3 via the switch 6 is an electrical Apply test voltage to the Gaseinblaseventil 1, measures the caused by the electrical test voltage discharge current I and thus infer the presence of the closed end position of the Gaseinblaseventils t. In order to measure the discharge current I running across the freewheeling diode 7, an ammeter 8 is provided whose signals can be fed to the controller 3.
    Fig. 2 illustrates the discharge current I (in amperes) measured in response to an applied test voltage, plotted over time t (in milliseconds).
    The curve 9 represents the measurement result in the case where the gas injection valve 1 was fully opened during the measurement (100% travel of the iron core).
    The curve 11 represents the measurement result in the case where the gas injection valve 1 was completely closed during the measurement (0% travel of the iron core).
    The curve 10 represents the measurement result in the case where the gas injection valve 1 was approximately half opened during the measurement (60% travel of the iron core).
    69407 36 / fr
    Fig. 3 represents a comparison of the results of various evaluation methods.
    The percentage deviation from the measured value of a completely closed valve is shown on the y-axis (intersection of the two axes). The trajectory of the iron core is shown in percent on the x-axis, with 0% corresponding to a completely closed valve and 100% to a completely open valve
    The curve 12 shows the result of a slope calculation based on the slope of the discharge current I.
    The curve 13 shows the result of a calculation based on the maximum amplitude of the discharge current I at a predetermined time in the course of the discharge current.
    Curve 14 shows the result of a calculation based on an integration of the area below the course of the discharge current I in FIG. 2 over the entire discharge duration.
    The curve 15 shows the result of an inductance calculation from the temporal current profile according to the relationship l (t) = lmax * exp (-R * t / L)
    The curve 16 shows the result of a calculation based on an integration of the area below the course of the discharge current I in FIG. 2 over a defined temporal partial area of the total discharge duration
    From all methods, the position of the valve (closed, opened or partially open) can be detected clearly based on the evaluation of the temporal discharge current curve, wherein the quality of the detection differs. The curve 12 shows the best detectability, the curves 14 and 15 the worst, but still sufficient detectability.
    69407 36 / fr
    FIG. 4 relates to the possibility of being able to differentiate between a defective and a worn-out gas injection valve 1 by at least two applications of the method according to the invention. Fig. 4 shows on the y-axis the travel of the iron core. The time t is plotted in milliseconds on the x-axis.
    The time span 17 shows the opening duration of a defective gas injection valve 1, which in itself is infinite (limited here by the duration of the measurement), since it never reaches the closed end position.
    The time span 19 shows the opening duration of a new, properly functioning gas injection valve 1.
    The time span 18 shows the opening duration of a worn gas injection valve 1.
    The curve 20 shows the travel of a new gas injection valve. 1
    The curve 25 shows the Verfahrwerg a Gaseinblaseventils 1 with a post-opening defect.
    The curve 24 shows the travel of a worn Gaseinblaseventils first
    The reference numerals 21 and 22 designate the timings of the first and second detection according to the invention. The time span 23 is the specified wear tolerance and is 0.5 ms in this case.
    At time 22 of the second detection, a worn valve is closed, but a defective valve is still open. Thus, in a worn valve, the opening period can be adjusted by the engine control unit 4 to the required amount of gas and the internal combustion engine with the new
    Settings continue to operate. However, with a defective valve, the ignition is deactivated and the engine shut down to prevent damage from the excessive amount of gas.
    Innsbruck, June 6, 2011
    权利要求:
    Claims (11)
    [1]
    • • • • • • •

    1. A method for checking whether a source in an internal combustion engine between a fuel and a combustion chamber arranged, electromagnetically actuated Gaseinblaseventil is in its closed end position, including subjecting the Gaseinblaseventils with an electrical test voltage and a measurement of the electrical test voltage caused discharge current.
    [2]
    2. The method of claim 1, wherein the electrical test voltage is applied in the period between a predetermined valve closing timing and a planned ignition timing.
    [3]
    3. The method of claim 1 or 2, wherein the electrical test voltage is applied in the form of a DC pulse having a predetermined time duration and / or predetermined amplitude.
    [4]
    4. The method of claim 1 or 2, wherein the electrical test voltage is applied in the form of an AC voltage having a predetermined time duration and / or predetermined amplitude.
    [5]
    5. The method according to any one of claims 1 to 4, wherein the slope of the Entiadungsstroms is determined in a predetermined time interval.
    [6]
    6. The method according to any one of claims 1 to 4, wherein the absolute value of the discharge current is determined at least one time.
    [7]
    7. The method of claim 1, wherein an integral of the discharge current is determined over a predetermined time interval.
    [8]
    8. The method according to any one of claims 1 to 4, wherein from the discharge current, the inductance or the impedance of the valve spool is determined. • ♦ ♦ ·· * · · φ «φ 69407 36 / fr
    [9]
    9. The method according to any one of claims 1 to 8, wherein the application of the electrical test voltage is performed at least twice, for determining the time of and / or the time required to reach (s) the closed end position of the Gaseinblaseventils.
    [10]
    10. The method of claim 9, wherein a control of the internal combustion engine depending on the specific time or the required time between a worn and a defective Gaseinblaseventil is distinguished and adjusted by the control at a worn Gaseinblaseventil the opening duration of Gaseinblaseventils to the required amount of gas and in the case of a defective gas injection valve, the ignition of the combustion chamber is deactivated.
    [11]
    An internal combustion engine having an engine controller, a gaseous fuel source, at least one combustion chamber in which the gaseous fuel is ignited, and an electromagnetically actuated gas injection valve disposed between the gaseous fuel source and the at least one combustion chamber, characterized in that the engine controller at least at a time when the gas injection valve should be in a closed end position, applying an electrical test voltage to the gas injection valve, measuring the discharge current caused by the electrical test voltage, and thus inferring the presence of the closed end position of the gas injection valve. Innsbruck, June 6, 2011
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    引用文献:
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    DE102008029224A1|2008-06-19|2009-12-31|Bayerische Motoren Werke Aktiengesellschaft|Check valve's function i.e. tightness, testing method for fluid pipe in motor vehicle, involves implementing difference pressure-observation by valves during period and controlling observation in no-load operation by control unit|
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    法律状态:
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