• 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:
    The invention relates to a control device for a VCR connecting rod (6.1, 6.2, 6.3), which can be actuated by means of a control circuit (25.1). Such a VCR connecting rod (6.1, 6.2, 6.3) should enable safe operation. For this purpose, a detection device (42) is provided for determining a defect in the control circuit (25.1). The invention further relates to a corresponding method for operating a control circuit (25.1) of a VCR connecting rod (6.1, 6.2, 6.3) of an internal combustion engine.
    公开号:AT16649U1
    申请号:TGM8034/2019U
    申请日:2018-04-10
    公开日:2020-04-15
    发明作者:Kai Arens Dr
    申请人:Avl List Gmbh；Iwis Motorsysteme Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    CONTROL DEVICE FOR A VCR CONNECTING ROD FOR DETECTING A DEFECT The present invention relates to a control device for a VCR connecting rod which can be actuated by means of a, preferably hydraulic, control circuit.
    Such a VCR connecting rod (variable compression ratio) is known for example from WO2015 / 055582 A2. The thermal efficiency η ΤΗ of gasoline engines depends on the compression ratio ε, ie the ratio of the total volume before compression to the compression volume (ε = (stroke volume V h + compression volume V c ) / compression volume V c ). As the compression ratio increases, the thermal efficiency also increases. The increase in thermal efficiency over the compression ratio is degressive, but is still relatively pronounced in the range of today's values (ε = 10 -14).
    In practice, the compression ratio cannot be increased arbitrarily. For example, too high a compression ratio in gasoline engines leads to knocking. The mixture ignites due to the pressure and temperature increase during compression and not due to the ignition spark. This premature combustion not only leads to uneven running, but can also cause component damage.
    The compression ratio from which knocking occurs is i.a. depending on the operating point (speed n, temperature T, throttle valve position etc.) of the engine. A higher compression is possible in the partial load range. Therefore, there is an effort to adapt the compression ratio to the respective operating point. There are various development approaches for this. According to WO 2015/055582 A2 mentioned above, the compression ratio should be adjusted by the connecting rod length. The connecting rod length influences the compression volume. The stroke volume is determined by the position of the crankshaft journal and the cylinder bore. A short connecting rod therefore leads to a lower compression ratio than a long connecting rod with otherwise the same geometrical dimensions (crankshaft, cylinder head, valve control, etc.). In the known device, the connecting rod length is varied hydraulically between two positions. The entire connecting rod is made up of several parts, with the length being changed by a telescopic mechanism. The connecting rod contains a double-acting hydraulic cylinder. The small connecting rod eye (piston pin) is connected to a piston rod (telescopic rod part). The piston is guided axially displaceably in a cylinder which is arranged in the connecting rod part with the large connecting rod eye (crankshaft journal). The piston separates the cylinder into two chambers (upper and lower pressure chamber). These two chambers are supplied with engine oil via check valves (RSV1 and RSV2). If the connecting rod is in the long position, there is no oil in the upper pressure chamber. The lower pressure chamber, however, is completely filled with oil. During operation, the connecting rod is subjected to alternating tensile and compressive loads due to the gas and inertial forces. In the long position, a tensile force is absorbed by the mechanical contact with an upper stop of the piston. This does not change the connecting rod length. An acting pressure force is transferred to the oil-filled lower chamber via the piston surface. As the check valve in this chamber prevents oil return, the oil pressure rises. The connecting rod length does not change. The connecting rod is hydraulically locked in this direction.
    In the short position, the situation is reversed. The lower chamber is empty, the upper one is filled with oil. A tensile force causes an increase in pressure in the upper chamber. A compressive force is absorbed by a mechanical stop.
    The connecting rod length can be adjusted in two stages by emptying one of the two chambers. One of the two inlet check valves (RSV1 and RSV2) is bridged by an assigned return channel (RL1 and RL2). Oil can flow through this return channel regardless of the pressure difference between the pressure chamber and the supply part. The respective check valve loses its effect.
    The two return channels are opened and closed by a control valve / 19th
    AT 16 649 U1 2020-04-15 Austrian patent office whereby exactly one return channel is always open, the other is closed. The actuator for switching the two return channels is controlled hydraulically by the supply pressure.
    The oil is supplied by the lubrication of the connecting rod bearing. For this, an oil feed-through from the crankshaft journal via the connecting rod bearing to the connecting rod is required.
    The circuit is carried out by deliberately emptying one of the two pressure chambers using the mass and gas forces acting on the connecting rod, the other pressure chamber being supplied with oil and hydraulically blocked by an inlet check valve.
    However, the compression ratio should only be increased noticeably in partial or low-load operation, which is why it is important that a hydraulic control circuit of the VCR connecting rod functions with the necessary certainty.
    It is therefore the object of the present invention to provide a control device of the type mentioned, which provides sufficient security against engine damage.
    [0012] This object is achieved according to the invention in a control device of the type mentioned at the outset in that a detection device is provided for determining a defect in the control circuit.
    [0013] The invention is advantageously used in a control device for a VCR connecting rod with an actuating device, which (or which) can be actuated by means of a — preferably hydraulic — control circuit.
    The detection of such a defect can then subsequently be used to carry out a wide variety of measures, to prevent engine damage and, if appropriate, to permit further, non-critical operation. Whenever the VCR connecting rod does not move into the desired target position using the control circuit or is possibly unstable, this can be determined according to the type of design of the detection device. The control circuit is preferably designed as a hydraulic control circuit; but it can also be a mechanical control circuit. The control circuit preferably comprises only the components which are responsible for the respective signal or energy flow (e.g. hydraulic flow) and not the components which carry out the adjustment stroke (e.g. upper and lower connecting rod parts with pistons and cylinders or eccentric connecting rod eyes). These components carrying out the adjustment stroke are preferably to be attributed to the actuation mechanism which can be activated by the control circuit.
    [0015] According to one embodiment, the detection device preferably comprises a differentiation device for identifying the defective component of the control circuit. These components can be, for example, return valves, non-return valves, control lines, control valves, or just all components that act directly in or on the control circuit. This means all components that actively participate in the energy flow, in particular hydraulic flow, of the control circuit. The differentiating device and thus the exact identification of the defect subsequently gives the opportunity to introduce targeted measures that do justice to this defect and represent the best possible solution for the defect situation.
    For this purpose, in a further variant, an error handling device can be provided and configured in such a way that after determining a defect by the detection device depending on an error routine stored in a memory device, it outputs at least one predetermined control signal for effecting a predetermined switching position of the control circuit. The fault handling device thus brings about a predetermined activation behavior of the activation circuit, in particular measures are initiated which are intended to prevent engine damage. In the worst case, the relevant cylinder or internal combustion engine is switched off. Limiting the performance of this cylinder or internal combustion engine is an acceptable alternative. A sol
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    AT 16 649 U1 2020-04-15 Austrian patent office safety system thus increases the safety of the vehicle and the occupants (e.g. if it stops). If, for example, the compression ratio in the cylinder becomes too high, there is a risk of damage, for example, due to an unstable position of the connecting rod (knocking). In addition to the negative acoustic effect, knocking can also lead to a defect in the internal combustion engine. In particular, if the defect is clearly identified beforehand, the countermeasures to be initiated can also be tailored precisely to this identified defect.
    For this purpose, according to a further embodiment, it can be provided that the error handling device is configured such that, depending on the identified defective component or the identified defective components and depending on an error routine stored in a memory device, at least one predetermined control signal for taking one of the outputs the identified defective component or the switching position of the control circuit assigned to the identified defective components. The exact identification of the defective component or components allows the appropriate countermeasures to be taken, up to and including switching off the cylinder or the internal combustion engine. Alternatively or in addition, the VCR connecting rod can also be moved into a stable position, in which it can at least partially maintain its function (possibly with reduced performance or poorer exhaust gas values).
    [0018] The detection device can advantageously have a sensor device for determining the actual position of the VCR connecting rod and / or a sensor device for determining the actual state of a component or the components of the control circuit. A sensor that is often already present in corresponding internal combustion engines is the knock sensor, which can be used, for example, to determine the actual position of the VCR connecting rod. However, displacement or other state sensors can also be used to determine the operating state of the control circuit and / or the components, which give a direct conclusion about the actual position of the VCR connecting rod or the state of the respective monitored component. State sensors that work independently are particularly suitable for this, since they are preferably housed in a fast-moving system and these are very difficult to supply with energy from the outside or the data of which are to be queried.
    [0019] Additionally or alternatively, according to a further embodiment, a storage device with a stored status log for the switching position of the control circuit to be assumed as a function of engine performance data can be provided, with an evaluation device being provided which uses the engine performance data determined and a comparison with the status log to determine the desired Position of the VCR connecting rod and / or the target state of a component or components of the control circuit is determined. In modern internal combustion engines, there is usually an engine control (or control units) that already determines and makes suitable engine data available. This can be, for example, the speed, the torque, if appropriate, further parameters of the internal combustion engine, which provide conclusions about the specific target position of the VCR connecting rod or the control circuit. Data relating to the oil circuit, in particular the oil pump, can also be used as long as sufficient conclusions can be drawn about the target position of the VCR connecting rod and the control circuit.
    In a particularly simple version it is provided that a hydraulic control circuit comprises a control valve and the differentiating device is configured such that it generates a signal for changing the switching position of the control valve after identifying a defect in order to identify the defective component of the control circuit. On the basis of the switchover process or change of the switching position and the state change normally associated therewith, a determination or, if necessary, a limitation of the defect that has occurred can be effected. There may also be repeated switching back and forth in order to determine the specific defect or the defective position according to the exclusion principle.
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    AT 16 649 U1 2020-04-15 Austrian Patent Office Furthermore, the invention relates to a method for operating a control circuit of a VCR connecting rod (or an actuating mechanism of a VCR connecting rod) of an internal combustion engine. The process has the following steps:
    Determination of a defect in the control circuit by means of a detection device and generation of a predetermined control signal for defect-dependent control of the control circuit or switching off the internal combustion engine and / or for generating a defect display signal for effecting an optical and / or acoustic error display.
    [0023] Defect-dependent control naturally only makes sense if different defects can occur which require an adapted control of the control circuit. In addition or as an alternative, an error message is sent to the driver of a vehicle, who may receive instructions (e.g. visiting a workshop, stopping the vehicle immediately).
    [0024] The desired position of the VCR connecting rod can advantageously be determined on the basis of a comparison of determined status data of the VCR connecting rod and / or of the internal combustion engine with correspondingly stored status data, the actual position of the VCR connecting rod being determined directly and / or indirectly and a defect can be determined by comparing the target position with the actual position. For example, corresponding status data or target data can be stored in an engine control, which indicate the required target position of the VCR connecting rod. This is in contrast to the actually determined actual position of the VCR connecting rod. This actual position can be determined, for example, by means of a knock sensor, displacement sensor or also indirectly by means of state sensors within the control circuit or on the basis of engine data, possibly including the data of the oil pump. A comparison of the target position with the actual position can then be used to determine whether the VCR connecting rod is working as desired or whether there is an error, i.e. a defect.
    Optionally, the state data of the VCR connecting rod determined to determine the desired position may include the oil pressure at the connecting rod bearing and / or the control state of the associated oil pump and / or the determined state data of the internal combustion engine, speed and / or the torque. On the basis of the speed and / or the torque, the load state of the internal combustion engine can be determined and the associated compression ratio, i.e. the target position of the VCR connecting rod. In a similar way, the target position of the VCR connecting rod can be inferred from the oil pressure or the activation state of the associated oil pump. A comparison with stored data is usually necessary.
    Advantageously, a sensor device present on the internal combustion engine, in particular a knock sensor, and / or a sensor device on the VCR connecting rod can be used to determine the actual position of the VCR connecting rod. In particular, when using the knock sensor, conventional internal combustion engines do not require too much modification, since this knock sensor is usually already present and only has to be used to determine the actual position of the VCR connecting rod. As a rule, this can be determined with an appropriately adapted evaluation routine. Alternatively or in addition, sensor devices or components of sensor devices can also be present on the VCR connecting rod, by means of which the actual position can be determined.
    [0027] To determine the actual position of the VCR connecting rod, an evaluation of performance data of the internal combustion engine can be carried out, the performance data used making it possible to draw conclusions about the actual position.
    Furthermore, after determining predetermined defects by actuating the control circuit, the VCR connecting rod can be moved into a stable position, the short position of the VCR connecting rod preferably having priority depending on the defect. In the short position of the VCR connecting rod, the disadvantage lies mainly in possibly worsening exhaust gas values, whereby a trip with the vehicle, e.g. to a workshop is still possible. The short position definitely prevents irreversible damage to the burn
    AT 16 649 U1 2020-04-15 Austrian patent office comes.
    In contrast, if the VCR connecting rod is moved to a stable position depending on the defect, which corresponds to the long position of the VCR connecting rod, the available power of the internal combustion engine can be reduced to a predetermined lower level. This prevents knocking in the long position, which could damage the internal combustion engine. The reduction in performance takes this into account; however, a drive to the nearest workshop is still possible even with this reduced output.
    According to a further method variant, in which the control circuit comprises a control valve, the defective component or components of the control circuit is determined by switching the control valve. By switching the control valve, a distinction can be made between a stable and an unstable position. In addition, conclusions can be drawn as to which component is defective, since a certain state can no longer be achieved in a stable manner. The defect can thus be narrowed down. Other elements of the control circuit can also be switched for this purpose in order to determine a defect.
    Furthermore, it can be provided that the control circuit comprises as components a first check valve (RLV1), a first check valve (RSV1), a second check valve (RLV2), and a second check valve (RSV2), the control circuit after determining one Defect of one of these components causes the VCR connecting rod to move into a stable position (safe position) after the following error routine:
    RLV / RSV Defect (flow) Safe position RLV1 no Long uncontrolled Short RSV1 no Short uncontrolled Long RLV 2 no Short uncontrolled Long RSV 2 no Long uncontrolled Short
    When a defect occurs, i. h that e.g. there is no flow at all through the valve, or this occurs in an uncontrolled manner (i.e. regardless of the specific switching position or due to leakage), a predetermined position of the VCR connecting rod is assumed.
    A predetermined error routine can also be installed for the defect of several of these components. If a stable position can no longer be achieved, the corresponding cylinder or internal combustion engine is switched off.
    In general, the position of the VCR connecting rod is set depending on the speed and load torque of the internal combustion engine. In the simplest case, the same position is specified for the VCR connecting rods in all cylinders at the same time. However, switching strategies are also conceivable according to which the VCR connecting rod sets a proprietary compression ratio for each individual cylinder. Accordingly, a different procedure or a different arrangement can also be used in the context of this invention for each cylinder.
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    AT 16 649 U1 2020-04-15 Austrian patent office
    In the following, an embodiment of the invention is explained in more detail with reference to drawings. Show it:
    Figure 1Fig. 2 2 shows a schematic cross section through an internal combustion engine,2 shows a schematic representation of a connecting rod from FIG. 1 with a hydraulic control circuit, Fig. 3 is a schematic representation of an internal combustion engine with VCR connecting rod and control Fig. 4 an allocation table with regard to a defect and a safe position and Fig. 5 an assignment table similar to FIG. 4 when multiple defects occur.
    In Fig. 1, an internal combustion engine (gasoline engine) 1 is shown in a schematic representation. The internal combustion engine 1 has three cylinders 2.1, 2.2 and 2.3, in each of which a reciprocating piston 3.1, 3.2, 3.3 moves up and down. Furthermore, the internal combustion engine 1 comprises a crankshaft 4 which is rotatably supported by means of crankshaft bearings 5.1-5.4. The crankshaft 4 is connected to the associated reciprocating pistons 3.1, 3.2 and 3.3 by means of the connecting rods 6.1, 6.2 and 6.3. For each connecting rod 6.1, 6.2 and 6.3, the crankshaft 4 has an eccentrically arranged crankshaft journal 7.1.7.2 and 7.3. The large connecting rod eye 8.1,8.2 and 8.3 is mounted on the associated crankshaft journal 7.1, 7.2 and 7.3. The small connecting rod eye 9.1, 9.2 and 9.3 are each mounted on a piston pin 10.1, 10.2 and 10.3 and thus pivotally connected to the associated lifting pistons 3.1.3.2 and 3.3.
    The crankshaft 4 is provided with a crankshaft sprocket 11 and coupled to a camshaft sprocket 13 by means of a timing chain 12. The camshaft sprocket 13 drives a camshaft 14 with its associated cams for actuating the intake and exhaust valves (not shown in detail) of each cylinder 2.1, 2.2 and 2.3. The empty run of the control chain 12 is tensioned by means of a pivotably arranged tensioning rail 15, which is pressed onto it by means of a chain tensioner 16. The tension strand of the control chain 12 can slide along a guide rail. The essential functioning of this control drive, including fuel injection and ignition by means of a spark plug, is not explained in more detail and is assumed to be known. The eccentricity of the crankshaft journals 7.1, 7.2 and 7.3 essentially determines the stroke distance H K , in particular if, as in the present case, the crankshaft 4 is arranged exactly centrally under the cylinders 2.1, 2.2 and 2.3. The reciprocating piston 3.1 is shown in its lowest position in FIG. 1, while the reciprocating piston 3.2 is shown in its uppermost position. In the present case, the difference gives the stroke H K. The remaining height H c (see cylinder 2.2) gives the remaining compression height in cylinder 2.2. In connection with the diameter of the reciprocating piston 3.1, 3.2 or 3.3 and the associated cylinder 2.1, 2.2 and 2.3 resulting from the travel path H K the swept volume V h and from the remaining compression height H c is the compression volume V c calculated. Of course, the compression volume V c largely depends on the design of the cylinder cover. The compression ratio ε is calculated from these volumes V h and V c . ε is calculated from the sum of the stroke volume V h and the compression volume V c divided by the compression volume V c . Today's values for gasoline engines are between 10 and 14 for ε.
    So that the compression ratio ε can be adjusted depending on the operating point (η, T, throttle valve position) of the internal combustion engine 1, the connecting rods 6.1, 6.2 and 6.3 are designed to be adjustable in length according to the invention. This can e.g. in the partial load range with a higher compression ratio than in the full load range.
    2, the connecting rod 6.1 is shown schematically and by way of example, but is configured identically to the connecting rods 6.2 and 6.3. The description therefore applies accordingly. The VCR connecting rod 6.1 has a displaceably arranged first rod part 17.1
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    AT 16 649 U1 2020-04-15 Austrian patent office, at the upper end of which the small connecting rod eye 9.1 is arranged. The second part of the bar
    18.1 has a lower bearing shell 19.1 which, together with the lower region of the second rod part 18.1, surrounds said large connecting rod eye 8.1. The lower bearing shell 19.1 and the second rod part 18.1 are usually connected to one another by means of fastening means. The lower end of the first rod part 17.1 is provided with an adjusting piston 20.1, which is displaceably guided in a piston bore 21.1. At the upper end, the second rod horn 18.1 has a cover 22.1 through which the first rod part 17.1 is guided and sealed. The cover 22.1 thus seals the piston bore 21.1 overall. The adjusting piston 20.1 is designed as a stepped piston. Below the adjustment piston
    20.1, a first pressure chamber 23.1 is formed with a circular cross-section, and an annular second pressure chamber 24.1 is formed above the adjusting piston 20.1. The adjusting piston 20.1 and the piston bore 21.1 are part of an adjusting mechanism for changing the connecting rod length. The adjusting mechanism also includes a hydraulic control circuit 25.1 to be described in more detail, which accordingly ensures that the hydraulic fluid flows in and out of the pressure chambers 23.1 and 24.1 and thus moves or locks the adjusting piston 20.1. As mentioned above, the adjusting piston 20.1 is designed as a stepped piston. A stepped piston is generally understood to mean a double-acting piston with differently sized active surfaces. A first adjusting piston side 26.1 is circular and is assigned to the first pressure chamber 23.1. A second adjusting piston side 27.1 is configured in a circular shape and is assigned to the second pressure chamber 24.1. The hydraulic control circuit 25.1 is operated with engine oil. For this purpose, an oil supply channel 28.1 is connected to the large connecting rod eye 8.1, as a result of which engine oil can be supplied to the hydraulic control circuit 25.1 or, if appropriate, flows out of it. The oil supply channel 28.1 branches into different lines (subchannels). A first line 29.1 is connected to the first pressure chamber 23.1 in order to ensure an inflow into the first pressure chamber 23.1. In addition, there is a first check valve 30.1 in the line 29.1, which is intended to prevent an immediate outflow of the oil from the first pressure chamber 23.1, but enables an inflow at any time. A second line 31.1 is connected to the second pressure chamber 24.1 in order to allow oil to flow into the second pressure chamber 24.1. In the second line 31.1 there is a second check valve 32.1, which prevents oil from flowing directly out of the second pressure chamber 24.1, but enables an inflow at any time.
    Furthermore, a control valve 33.1 is provided, which has two switching positions. The control valve 33.1 is directly connected to a third line 34.1 of the oil supply channel 28.1. In each of its two switching positions, the control valve 33.1 acts as either a return valve 35.1 for flowing hydraulic fluid out of the second pressure chamber 24.1 or in its second switching position as a return valve 36.1 for flowing hydraulic fluid out of the first pressure chamber 23.1. The other pressure chamber 23.1 or
    24.1 is hydraulically locked in the respectively associated switching position, which is why the first rod part 17.1 assumes either the retracted or the extended position. The control valve 33.1 is switched by means of a control line 27.1 which is connected to the second branch
    31.1 downstream of the second check valve 32.1 and a return spring 38.1 which presses the control valve 33.1 into the first switching position shown in FIG. 2. The second switching position is achieved by an increased pressure level in the oil supply channel
    28.1 is generated so that the control valve 33.1 is pressed against the force of the return spring 38.1 in the second switching position. Corresponding first and second return channels 39.1 and
    40.1 are connected to the control valve 33.1 in the associated line sections of the first and second line 29.1 and 31.1 in order to enable a corresponding outflow from the first pressure chamber 23.1 and the second pressure chamber 24.1.
    It should be noted that the hydraulic control circuit 25.1 also have additional elements, channels, valves, etc. or can be configured differently in order to provide the desired adjustment function. The first and second return valves 35.1 and 36.1 do not necessarily have to be designed as a common control valve 33.1, but can be designed as separate structural units. The hydraulic circuit diagram of the
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    AT 16 649 U1 2020-04-15 Austrian patent office hydraulic control circuit 25.1 is therefore only to be understood as representative of the mode of operation and not for the specific design.
    The control device for the VCR connecting rod 6.1 is described in more detail below with reference to the schematic FIG. 3. The same applies to the VCR connecting rods 6.2 and 6.3.
    The VCR connecting rod 6.1 is part of an internal combustion engine 1, which has an engine control 41 (e.g. control units ECU etc.) that detects multiple engine data, e.g. the actual speed, the current torque and any other parameters, e.g. the oil pressure etc. In the present case, the engine control 41 comprises a detection device 42 (can also be provided separately) for determining a defect in the hydraulic control circuit 25.1. Part of the internal combustion engine 1 is also an oil pump unit 43, which is also connected to the engine control 41 and the detection device 42 by means of an electrical line 44. By means of the oil pump unit 43, the supply via the oil supply channel 28.1 can be ensured in the region of the crankshaft bearing of the VCR connecting rod 6.1 and at least a first and a second pressure level can be set such that the control valve 33.1 is switched. Modern internal combustion engines are usually already equipped with a knock sensor 45 in order to protect the internal combustion engine 1 from damage. The knock sensor 45 used here can also be used for the precise determination of the switching position of the VCR connecting rod 6.1. Knock sensor 45 can be used to clearly differentiate between the first, extended position of VCR connecting rod 6.1 and the second, shorter switching position of VCR connecting rod 6.1. However, further sensors 46 or 47 can also be used on the internal combustion engine or directly in the VCR connecting rod 6.1. The sensor 46 can e.g. be a displacement sensor that detects the extended position of the first rod part 17.1. The sensor 47 can e.g. the switching position of the control valve
    33.1 record. The sensor 47 is preferably an autonomous sensor with its own energy source. All sensors can be used, by means of which a conclusion about the switching position or a defect in a component of the hydraulic control circuit 25.1 can be determined. This determination can be made directly or indirectly.
    To identify the defective component of the hydraulic control circuit 25.1, the detection device 42 comprises a differentiation device 48, which not only detects a defect, but can specifically determine the defective component.
    Furthermore, an error handling device 49 is optionally integrated in the motor controller 41 as part of the detection device 42. The error handling device 49 comprises a memory device 50, in which error routines are stored which, after determining a defect in the hydraulic control circuit 25.1 and, if necessary, after identifying the defective component of the hydraulic control circuit 25.1, bring the VCR connecting rod 6.1 into a predetermined switching position (quasi as an emergency mode) , or switch off the associated cylinder 2.1 or the internal combustion engine 1.
    It is important for the fault determination or for the determination of a defect that the desired target state (target position) of the VCR connecting rod 6.1 and the actual position of the VCR connecting rod 6.1 be compared. For this purpose, a status protocol is stored in the memory device 50, which contains the data necessary for the switch position to be assumed. This is usually engine performance data that is characteristic of a shift position to be assumed. By means of an evaluation device 51 integrated in the detection device 42 or the motor control 41, a comparison is made between the currently determined engine performance data and the status report. If they match or are within predetermined limits, then the target position of the VCR connecting rod 6.1 and / or the target state of a component or the components of the hydraulic control circuit 25.1 can be determined. The target position of the VCR connecting rod 25.1 or the target state of a component or the components of the hydraulic control circuit 25.1 determined in this way can then be compared with the actual position of the VCR connecting rod 6.1 and / or the actual status of a component or the Compare components of the hydraulic control circuit 25.1 and determine a deviation, thereby indicating a defect
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    AT 16 649 U1 2020-04-15 Austrian patent office can be closed.
    The entire process can take place in several stages. After detection of a defect, the identification of the defective component of the hydraulic control circuit 25.1 can include the execution of a certain routine. The differentiating device 48 is configured in such a way that, after determining a defect, it changes the switching position of the control valve 33.1. Should e.g. the control valve 33.1 is in a certain switching position and a deviation is determined, in particular the first rod part 17.1 is not in the corresponding position, then the control valve 33.1 is deliberately switched to the other switching position as part of the identification process.
    In this way it can be determined whether there is also a defect in this second switching position. If this is not the case, a whole series of components of the hydraulic control circuit 25.1 can already be excluded from further troubleshooting. Furthermore, a distinction can be made as to whether the desired target position or the desired target state cannot be reached at all or whether this state cannot be assumed in a controlled manner (because the result is unpredictable or changes over time, e.g. in the event of leakage).
    Preferably, the oil pump unit 43 also has a pressure sensor 52 or a sensor for determining the operating state, the result of which can be incorporated into this routine. As soon as the defective component is determined using this error routine, the defect can be categorized even further. The first check valve 35.1 (RLV1), the first check valve, is intended as an example of components of the hydraulic control circuit 25.1
    30.1 (RSV1), the second return valve 36.1 (RLV2) and the second check valve 32.1 (RSV2) must be monitored and ascertainable accordingly. The defect is classified with regard to the flow through this valve in each case. Either the flow is blocked; accordingly, there is no flow or the flow is uncontrolled; does not lead to the predetermined result or changes over time, e.g. due to leakage without changing the switch position for actuating the hydraulic control circuit 25.1.
    4 shows a table that deals with the occurrence of a defect in only one of these components. Depending on the determined defect, the VCR connecting rod 6.1 should be moved to a safe position (stable position). A safe position is advantageous because then it is not absolutely necessary to switch off the associated cylinder 2.1 or the internal combustion engine 1. A trip to the workshop is still possible. The short position of the VCR connecting rod 6.1 is actually to be preferred, because this may result in the exhaust gas values deteriorating, but a further protective measure, which must be initiated to avoid damaging the cylinder 2.1 or the internal combustion engine 1, is not necessary. The associated vehicle usually has an optical and / or acoustic error display which indicates a defect or the special defect and suggests that a workshop be visited. The detection device 42 generates a specific control signal for the defect-dependent control of the hydraulic control circuit 25.1 in accordance with the specifications in the table in FIG. 4 and generates a defect display signal for effecting the visual and / or acoustic error display.
    Theoretically, there may also be a simultaneous defect in several components of the hydraulic control circuit 25.1. Appropriately, it can be seen from the table in FIG. 5 how to deal with corresponding defects. By the control circuit
    25.1 of the VCR connecting rod 6.1 is driven into a stable position. This is illustrated by way of example in the table in FIG. 5 on the basis of a defect in the first return valve 35.1 and one of the three further components of the hydraulic control circuit 25.1. In addition, it can also be determined for all other defect combinations whether a safe position is possible. The table also shows that e.g. in the event of a defect in the first return valve 35.1, in which there is no flow through it, and in the event of a defect in the first check valve 30.1, in which there is likewise no flow, there is a complete defect (“cannot be influenced”) which is used to switch off the associated one Cylinder 2.1
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    AT 16 649 U1 2020-04-15 Austrian patent office or to shutdown the internal combustion engine 1. If the long position of the VCR connecting rod 6.1 is selected as a safe position, the output of the internal combustion engine 1 or the cylinder 2.1 must also be throttled so that there is no knocking of the associated cylinder 2.1 or the internal combustion engine 1, as a result of which component damage can occur. The reduction to a predetermined lower power level is then correspondingly stored in the engine control 41.
    In the foregoing, an embodiment of the device and the method of the invention was exemplified using the VCR connecting rod 6.1. Of course, the invention can be applied to any VCR connecting rod of the internal combustion engine 1. As a rule, the position of the VCR connecting rod 6.1, 6.2 and 6.3 is set as a function of the speed and the load torque of the internal combustion engine 1. In the simplest case, the same position is specified for all VCR connecting rods 6.1, 6.2 and 6.3 in all cylinders 2.1, 2.2 or 2.3. However, switching strategies are also conceivable according to which the VCR connecting rod 6.1, 6.2 or 6.3 sets a proprietary compression ratio for each individual cylinder 2.1, 2.2 or 2.3. Accordingly, the behavior of the engine control and the associated components for controlling the hydraulic control circuit and determining a defect and carrying out error routines can then be customized for each VCR connecting rod 6.1,
    6.2 or 6.3. With the present invention, a malfunction of the VCR connecting rods 6.1, 6.2, 6.3 and the associated hydraulic control circuit 25.1 is detected via electronic control device devices and, if appropriate, sensor technology, and measures are taken immediately to prevent engine damage. In the simplest form, the defect of a component of the hydraulic control circuit 25.1 is to be detected via the position of the first rod part 17.1, the current desired state being compared with the actual actual state.
    For this purpose, the desired position of the VCR connecting rod 6.1, 6.2 or 6.3 must first be known. For this purpose, the engine control 41 or a device with comparable information and capabilities, the actual speed, the current torque and possibly further parameters which define the target position of the VCR connecting rod 6.1, 6.2 or 6.3 (for example oil pressure) with a stored State protocol for the VCR connecting rods 6.1.6.2 or 6.3 compared. This then results in the target position of the VCR connecting rod 6.1, 6.2 or 6.3. The actual position of the VCR connecting rod 6.1, 6.2 or 6.3 can now be recorded using a suitable sensor system in the engine compartment. However, it is also conceivable for displacement or state sensors to be installed directly in the VCR connecting rod 6.1, 6.2 or 6.3, or for conclusions to be drawn about the actual position of the VCR connecting rod simply by evaluating the engine performance data
    6.1.6.2 or 6.3.
    If it is now determined that the target position is not reached over several combustion cycles, it can be concluded from this that a defect has occurred in the VCR connecting rod 6.1, 6.2 or 6.3, which is associated with the valve or valves of the associated pressure chamber 23.1 or 24.1.
    In such a case, the specification for the desired position of the VCR connecting rod 6.1, 6.2 or 6.3 can be changed via the motor controller 41, so that the VCR connecting rod 6.1, 6.2 or 6.3 takes a different position. In the telescope system described here, the VCR connecting rod 6.1 would be switched from the short to the long position or vice versa by adjusting the control pressure level by means of the oil pump unit 43.
    In the event of a deviation, the defective component is to be identified, a preferred operating state is assumed and a signal is given to the driver.
    In order to recognize at which point the defect is present, the position of the control valve is
    33.1 to change, e.g. hydraulic (changing the pressure level on the large connecting rod eye 8.1) or mechanical. The defective position can thus be determined using the exclusion principle. Subsequently, the VCR connecting rods 6.1, 6.2 or 6.3 should be brought into a stable position, with the "short" position being preferred, since engine damage can be excluded in this position and only the exhaust gas values are temporarily not met. A ride
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    AT 16 649 U1 2020-04-15 Austrian patent office for the workshop is possible.
    If only the "long" position is possible, the power is to be limited immediately, otherwise there is a risk of engine damage due to knocking at high speed. Then a trip to the workshop is possible.
    If there is a defect (“cannot be influenced”) at more than one point, the ferry service may have to be stopped immediately.
    In any case, the driver is to be informed of the defect by a suitable signal.
    In the present exemplary embodiment, a whole series of devices (e.g. detection device 42, differentiation device 48, error handling device 49, memory device 50, and the evaluation device 51 are integrated as a component in the engine control 41). In some cases, these are only stored or programmed as program sequences within the motor control 41. Of course, there is also the possibility of locating individual devices or all devices separately from the motor controller 41. Such devices can also be assigned to each VCR connecting rod 6.1, 6.2 or 6.3, or they can be made responsible for part or all of the VCR connecting rods 6.1, 6.2 or 6.3.
    / 19th
    AT 16 649 U1 2020-04-15 Austrian patent office
    REFERENCE SIGN LIST
    1 Internal combustion engine 2.1.2.2.2.3 cylinder 3.1,3.2,3.3 Reciprocating piston 4th crankshaft 5.1,5.2,5.3,5.4 Crankshaft bearings 6.1.6.2.6.3 connecting rod 7.1.7.2.7.3 Crankshaft journal 8.1,8.2,8.3 large connecting rod eye 9.1,9.2,9.3 small connecting rod eye 10.1,10.2,10.3 Piston pin 11 Crankshaft sprocket 12 Timing chain 13 Camshaft sprocket 14 camshaft 15 Tensioning rail 16 Chain tensioner 17.1 first rod part 18.1 second part of the pole 19.1 lower bearing shell 20.1 Adjusting piston 21.1 Piston bore 22.1 cover 23.1 first pressure chamber 24.1 second pressure chamber 25.1 hydraulic control circuit 26.1 first adjusting piston side 27.1 second adjusting piston side 28.1 Oil supply channel 29.1 first strand 30.1 first check valve 31.1 second strand 32.1 second check valve 33.1 Control valve 34.1 third strand 35.1 first return valve
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    AT 16 649 U1 2020-04-15 Austrian patent office
    second return valve
    Control line
    Return spring first return channel second return channel
    Engine control
    Detection device
    Oil pump unit
    management
    Knock sensor
    sensor
    sensor
    Discriminator
    Error handling facility
    Storage device
    Evaluation device
    Pressure sensor
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    AT 16 649 U1 2020-04-15 Austrian
    权利要求:
    Claims (15)
    [1]
    Expectations
    1. Control device for a VCR connecting rod (6.1, 6.2, 6.3), which can be actuated by means of a control circuit (25.1), characterized in that a detection device (42) is provided for determining a defect in the control circuit (25.1).
    [2]
    2. Control device according to claim 1, characterized in that the detection device (42) comprises a differentiation device (48) for identifying the defective component (30.1,32.1,35.1,36.1) of the control circuit (25.1).
    [3]
    3. Control device according to claim 1 or 2, characterized in that an error handling device (49) is provided and configured in such a way that after detection of a defect by the detection device (42) as a function of an error routine stored in a memory device (50) at least one predetermined one Outputs control signal for effecting a predetermined switching position of the control circuit (25.1).
    [4]
    4. Control device according to claim 3, characterized in that the error handling device (49) is configured such that it as a function of the identified defective component (30.1, 32.1, 35.1, 36.1) or the identified defective components (30.1, 32.1, 35.1, 36.1) and, depending on an error routine stored in a memory device (50), at least one predetermined control signal for taking one of the identified defective components (30.1, 32.1, 35.1, 36.1) or the identified defective components (30.1, 32.1, 35.1, 36.1) Outputs the switching position of the control circuit (25.1).
    [5]
    5. Control device according to one of claims 1 to 4, characterized in that the detection device (42) comprises a sensor device (45, 46, 2) for determining the actual position of the VCR connecting rod (6.1, 6.2, 6.3) and / or Sensor device (47) for determining the state of a component (35.1,36.1) or the components (35.1,36.1) of the control circuit (25.1).
    [6]
    6. Control device according to one of claims 1 to 5, characterized in that a memory device (50) with a stored state protocol for the individual switching positions of the control circuit (25.1) is provided as a function of engine performance data, and an evaluation device (51) is provided, which Using the determined engine performance data and a comparison with the status report, the target position of the VCR connecting rod (6.1, .6.2, 6.3) and / or the target status of a component (30.1, 32.1, 35.1, 36.1) or the components (30.1 , 32.1, 35.1, 36.1) of the control circuit (25.1).
    [7]
    7. Control device according to one of claims 2 to 6, characterized in that the control circuit (25.1) comprises a control valve (33.1) and the differentiating devices (48) is configured such that, after determining a defect, a signal for changing the switching position of the control valve (33.1) for identifying the defective component of the control circuit (25.1).
    [8]
    8. Method for operating a control circuit (25.1) of a VCR connecting rod (6.1, 6.2, 6.3) of an internal combustion engine (1) with the following steps:
    Determining a defect in the control circuit (25.1) by means of a detection device (42) and generating a predetermined control signal for controlling the control circuit (25.1) depending on the defect or switching off the internal combustion engine (1) or switching off the cylinder of the internal combustion engine concerned and / or for generating a defect display signal to cause an optical and / or acoustic error display.
    [9]
    9. The method according to claim 8, characterized in that the target position of the VCR connecting rod (6.1, 6.2, 6.3) on the basis of a comparison of determined status data of the VCR connecting rod (6.1, 6.2, 6.3) and / or the internal combustion engine (1) with corresponding stored status data is determined, the actual position of the VCR connecting rod (6.1, 6.2, 6.3) directly
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    AT 16 649 U1 2020-04-15 Austrian patent office and / or indirectly determined and a defect can be determined by comparing the target position with the actual position.
    [10]
    10. The method according to claim 8 or 9, characterized in that the state data of the VCR connecting rod (6.1, 6.2, 6.3) determined for determining the desired position, the oil pressure on the large connecting rod eye (8.1) and / or the control state of the associated oil pump unit ( 43) and / or the determined status data of the internal combustion engine (1) includes the speed and / or the torque.
    [11]
    11. The method according to claim 9 or 10, characterized in that for determining the actual position of the VCR connecting rod (6.1, 6.2, 6.3) on the internal combustion engine (1) existing sensor device (46), in particular a knock sensor (45), and / or a sensor device (47) on the VCR connecting rod (6.1,6.2, 6.3 is used.
    [12]
    12. The method according to any one of claims 9 to 11, characterized in that after determining predetermined defects by actuating the control circuit (25.1), the VCR connecting rod (6.1, 6.2, 6.3) is moved into a stable position, depending on the defect the short position of the VCR connecting rod (6.1,6.2, 6.3) has priority.
    [13]
    13. The method according to any one of claims 9 to 12, characterized in that if, depending on the defect, the VCR connecting rod (6.1, 6.2, 6.3) is moved into a stable position which corresponds to the long position of the VCR connecting rod (6.1, 6.2, 6.3), the available power of the internal combustion engine (1) is reduced to a predetermined lower level.
    [14]
    14. The method according to any one of claims 9 to 13, characterized in that the control circuit (25.1) comprises a control valve (33.1) and the defective component (30.1, 32.1, 35.1, 36.1) or the defective components (30.1, 32.1, 35.1, 36.1) of the control circuit (25.1) is or are determined by switching the control valve (33.1).
    [15]
    15. The method according to any one of claims 9 to 14, characterized in that the control circuit (25.1) comprises as components a first return valve (35.1), a first check valve (30.1), a second return valve (36.1) and a second check valve (32.1), The control circuit (25.1), after determining a defect in one of these components, allows the VCR connecting rod (6.1, 6.2, 6.3) to move into a stable position (safe position):
    RLV / RSV Defect (flow) Safe position RLV 1(35.1) No long uncontrolled short RSV 1(30.1) No short uncontrolled long RLV 2(36.1) No short uncontrolled long RSV 2(32.1) No long uncontrolled short
    4 sheets of drawings
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    法律状态:
    2021-12-15| MM01| Lapse because of not paying annual fees|Effective date: 20210430 |
    优先权:
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    DE102017107717|2017-04-10|
    ATA50303/2018A|AT519804A3|2017-04-10|2018-04-10|Control device for a VCR connecting rod for determining a defect|
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