• 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 knock control of an internal combustion engine (1) with at least one cylinder (2), to which at least one inlet valve (3) is assigned, whereby when knocking occurs in at least one cylinder (2) by actuation of the cylinder (2) identified as being knocking associated intake valve (3) in such a way that the temperature of the charge of the recognized as knocking cylinder (2) is lowered, the knocking in the cylinder (2) is reduced.
    公开号:AT517396A1
    申请号:T375/2015
    申请日:2015-06-15
    公开日:2017-01-15
    发明作者:Spyra Nikolaus；Thalhauser Josef；Trapp Christian；Tinschmann Georg
    申请人:Ge Jenbacher Gmbh & Co Og；
    IPC主号:
    专利说明:

    The invention relates to a method for knock control of an internal combustion engine having the features of the preamble of claim 1 and to an internal combustion engine having the features of the preamble of claim 5.
    For knock control of internal combustion engines, it is known to use the ignition timing as a manipulated variable. When a knock sensor on a cylinder of the engine knocking is detected above, the knocking control changes the ignition timing of the cylinder in question for the next combustion cycle late, i. the ignition of the fuel-air mixture in the respective cylinder is triggered later in the combustion cycle than in the previous combustion cycle. By adjusting the ignition timing to late (retardation of the ignition), the focus of combustion is shifted, and so the cylinder in question moved away from the knock limit. A disadvantage of a knock control based on the adjustment of the ignition timing is that the efficiency of the internal combustion engine is impaired.
    The US 6,848,422 B2 (TOYOTA) describes a method for knock control on an internal combustion engine, which is equipped with a variable valve train, the knock control is that the valve opening of the intake valve is delayed when the operating angle of the intake valve is less than 180 °. Outside this window, the knock control is performed by adjusting the ignition timing.
    From WO 2008/000568 A1 (Siemens), a method for knock control is known, according to which the cylinder is detected as knocking cylinders of the internal combustion engine by means of a dynamic air filling actuator (impulse charger) for the next combustion process with a lower air mass than for the current combustion process is entrusted. The impulse generators serve to impulse-like air filling of the individual cylinders, by exploiting resonance vibration and Aufschaukeleffekte from the air mass flow in the intake manifold. The pulse-loader actuators are opened at those times during which a pulsed air mass flow flows through the respective inlet channel. Due to the lower cylinder filling, i. less air mass in the
    Combustion chamber of the respective cylinder, in which has been detected knock for the current combustion process, it is achieved that the tendency to knock of the cylinder in question is reduced for the subsequent combustion cycles. A disadvantage of this method is that special air filling actuators must be provided for influencing the air filling of the individual cylinders in the intake tract of the internal combustion engine.
    Object of the present invention is to provide a method for knock control of an internal combustion engine, which does not have the disadvantages of the prior art, in particular a loss of efficiency. Also, a corresponding internal combustion engine should be specified.
    These objects are achieved by a method having the features of claim 1 and an internal combustion engine having the features of claim 5.
    By reducing knock in at least one cylinder by actuating the intake valve associated with the cylinder juddering to knock so as to lower the temperature of the charge of the knocking cylinder, knocking in the cylinder is reduced, effective knocking control is realized without that the internal combustion engine suffers a loss of efficiency.
    Preferably, the temperature of the charge of the cylinder recognized as knocking is reduced for the next combustion cycle from the last combustion cycle.
    It is preferably provided that the occurrence of knocking is determined by at least one knock sensor in the at least one cylinder.
    The knock sensor can be designed, for example, as a structure-borne noise sensor or cylinder pressure sensor.
    It is preferably provided that the actuation of the inlet valve associated with the cylinder identified as knocking comprises an earlier closing, preferably an earlier closing in relation to the last combustion cycle.
    According to this variant, therefore, in the case of a cylinder recognized as being knocking, the associated inlet valve, for example via a variable valve train, is closed earlier in the intake stroke. The earlier closing of the intake valve in the intake stroke causes by the (compared to the previous compression stroke) increased adiabatic expansion cooling the cylinder charge. By this measure, the peak temperature of the cylinder charge is lowered and thus knocking avoided without adjusting the Ziindzeitpunkt.
    By a variable valve train, the opening and closing times and / or the valve lift curves - in short the operating characteristic - of the intake valves can be changed. Thus, the actuation characteristic of the intake valves is decoupled from the specification of the camshaft or at least partially decoupled.
    To exhaust the advantages of the invention, a variable valve train with cylinder-specific control of the intake valves is required.
    If the internal combustion engine comprises a cooled exhaust gas recirculation via which cooled exhaust gas can be supplied to the cylinders of the internal combustion engine, the actuation of the intake valve associated with the cylinder identified as knocking comprises a later closing, preferably a later closing relative to the last combustion cycle.
    According to this variant, it is therefore provided to lower the temperature of the cylinder charge (and thus avoid knocking) by supplying the cylinder in question with an increased amount of cooled exhaust gas. This results in the compression stroke of the cylinder concerned by the increased proportion of inert components in the cylinder charge a lowered temperature during combustion.
    In both variants of the method, a measure for power compensation can be set if the power output of the internal combustion engine should be kept constant.
    The power compensation may be such that those cylinders farther from the knock limit receive longer intake valve opening times, thereby increasing their power contribution. In this case, the power compensation is a cylinder-specific measure.
    The power-compensation measure may also consist in an increase in the boost pressure of the internal combustion engine, i. Here is a global action that affects all piston-cylinder units set.
    In both cases, the ignition timing can be maintained.
    The invention is particularly directed to a full load range of an internal combustion engine.
    It is preferably provided that the internal combustion engine is operated with Miller control times.
    The invention is particularly suitable for stationary internal combustion engines, in particular with a generator coupled to a genset internal combustion engines, in particular gas engines.
    The invention is explained in more detail by the figures. Showing:
    Fig. 1 is a schematic representation of an internal combustion engine
    Fig. 2 is a schematic representation of an internal combustion engine in a further embodiment Fig. 3 valve lift curves of an intake valve
    1 shows schematically an internal combustion engine 1 in a first embodiment, wherein only one cylinder 2 is shown. In practice, internal combustion engines often have a plurality of cylinders 2. Via an inlet channel 10, a fuel-air mixture can enter a combustion chamber formed in the cylinder 2. The amount and the time characteristic of the entry of fuel-air mixture via a variably actuatable intake valve 3. In other words, a variable valve train is realized on the internal combustion engine 1. The operation characteristic of the intake valve 3 is changeable by a control device 6.
    About a knock sensor 4 are characteristic for the knocking of the internal combustion engine 1 signals to the control / regulating device 6 can be notified.
    The knock sensor 4 may be embodied, for example, as a structure-borne sound sensor.
    From the combustion chamber of the internal combustion engine 1, exhaust gas flows via an outlet valve 9 into an outlet channel 11.
    If knocking is now detected by the knock sensor 4 in the cylinder 2, the control / regulating device 6 can activate the inlet valve 3 in such a way that it closes earlier than the last combustion cycle (in which knocking was detected). By closing the intake valve 3 earlier, the charge participating in the compression in the cylinder 2 decreases. Thus, for the next combustion cycle, the temperature of the charge of the cylinder 2 being knocked is lowered from the last combustion cycle and knocking in the cylinder concerned is reduced.
    Figure 2 shows schematically an internal combustion engine 1 in a further embodiment, wherein in addition to the embodiment of Figure 1, an exhaust gas recirculation 5 is provided. For the variable valve train that said for Figure 1 applies.
    The exhaust gas recirculation 5 can branch off exhaust gas from the outlet channel 11 and guide it back into the inlet channel 10. The exhaust gas recirculation 5 comprises, in addition to the exhaust gas recirculation line 12, a controllable valve 7 and a radiator 8. By means of the radiator 8 designed as a heat exchanger, the temperature of the branched off exhaust gas fed back to the inlet duct 10 can be lowered. The amount of recirculated exhaust gas is variable via the control device 6.
    If knocking is detected by the knock sensor 4 in the cylinder 2 in an internal combustion engine 1 of the present form, ie with cooled or cooled exhaust gas recirculation 5, the control / regulating device 6 can control the inlet valve 3 in such a way that it is opposite to the last combustion cycle (in which yes Knocking was detected) closes later. According to this variant, it is thus provided to lower the temperature of the cylinder charge (and thus avoid knocking) by supplying the cylinder 2 in question with an increased amount of cooled exhaust gas compared to the previous combustion cycle. This results in the compression stroke of the cylinder in question 2 due to the increased proportion of inert components in the cylinder charge a lower temperature compared to the past combustion cycle during combustion, whereby the affected cylinder 2 is less prone to tapping.
    The signal connections of the control / regulating device 6 to the variably actuatable inlet valve 3, the knock sensor 4 and the valve 7 of the exhaust gas recirculation 5 are shown in dashed lines
    FIG. 3 shows three valve lift curves (also: valve lift curves) a, b, c of intake valves 3 according to the two embodiments discussed as well as an initial state.
    The curve a represents the valve lift curve for the case in which by closing the intake valve earlier, the temperature of the cylinder charge is lowered and thus knocking is avoided.
    The curve b represents the valve lift curve in normal operation.
    The curve c represents the valve lift curve for the case in which, by later intake valve closing in conjunction with a cooled exhaust gas recirculation 5, the temperature of the cylinder charge is lowered and thus knocking is avoided.
    It can be seen that the measures allow the valve opening time to remain unchanged.
    List of reference numbers used: 1 Internal combustion engine 2 Cylinders 3 Intake valve 4 Knock sensor 5 Exhaust gas recirculation (EGR) 6 Control device 7 Valve 8 Radiator / heat exchanger 9 Exhaust valve 10 Intake passage 11 Exhaust passage 12 Exhaust gas recirculation line
    Innsbruck, 10 June 2015
    权利要求:
    Claims (6)
    [1]
    claims:
    1. A method for knock control of an internal combustion engine (1) with at least one cylinder (2), which is associated with at least one inlet valve (3), characterized in that when knocking in at least one cylinder (2) by actuating the knocking as 2) associated intake valve (3) such that the temperature of the charge of the knocking cylinder (2) is lowered, the knocking in the cylinder (2) is reduced.
    [2]
    2. The method of claim 1, wherein the occurrence of knocking by at least one knock sensor (4) in the at least one cylinder (2) is detected.
    [3]
    3. The method of claim 1 or 2, wherein the actuation of the cylinder (2) associated with the knocking associated intake valve (3) includes an earlier closing.
    [4]
    4. The method of claim 1 or 2, wherein the internal combustion engine (1) additionally comprises a cooled exhaust gas recirculation (5) via which the cylinders (2) of the internal combustion engine (1) via the inlet valves (3) cooled exhaust gas is supplied and the actuation of the to the cylinder (2) associated with the knocking cylinder (2) associated with the intake valve (3) comprises a subsequent closing.
    [5]
    5. internal combustion engine (1) with - at least one cylinder (2), which is associated with at least one inlet valve (3), - a variable valve train (5) for the cycle and cylinder individual metering a charge of fuel-air mixture to the at least one Cylinder (2) by means of the at least one inlet valve (3), - at least one on a cylinder (2) arranged knock sensor (4) for detecting knock of the respective cylinder (2), - a control / regulating device (6) for cycle and cylinder-specific control / regulation of the at least one inlet valve (3), characterized in that the control device (6) is configured, when knock occurs in a cylinder (2), the inlet valve (3) belonging to the cylinder (2). to actuate so as to lower the temperature of the charge of the cylinder (2) recognized as being knocking, thereby reducing the knock in the cylinder (2).
    [6]
    6. Internal combustion engine (1) according to claim 5, further comprising a cooled exhaust gas recirculation (5) via which the cylinders (2) of the internal combustion engine (1) via the inlet valves (3) cooled exhaust gas can be fed. Innsbruck, 10 June 2015
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    引用文献:
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    DE102006029279B3|2006-06-26|2007-10-25|Siemens Ag|Petrol engine`s cylinder-individual knock controlling method, involves filling cylinder having knock noise with lower air mass by using impulse loader-actuators in air intake channels for next combustion process of combustion cycle|
    JP2011122544A|2009-12-11|2011-06-23|Toyota Motor Corp|Internal combustion engine|
    EP2907993B1|2014-02-13|2019-11-06|Caterpillar Motoren GmbH & Co. KG|Method for balancing cylinders of an internal combustion engine|GB2574443A|2018-06-06|2019-12-11|Caterpillar Motoren Gmbh & Co|Knock mitigation and cylinder balancing in an internal combustion engine|
    法律状态:
    2021-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20200615 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA375/2015A|AT517396B1|2015-06-15|2015-06-15|Method for knock control|ATA375/2015A| AT517396B1|2015-06-15|2015-06-15|Method for knock control|
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