DE102006042969B4 - Method and device for operating an internal combustion engine - Google Patents

Abstract

For operating an internal combustion engine, an operating point of the internal combustion engine and a value course of a test operating variable which is representative of a torque produced by the internal combustion engine are determined in a predetermined time window about a valve lift switch (V_LIFT). It is checked whether the ascertained value course of the test operating variable has a value jump that is greater than a predefined jump threshold value. If the value jump is greater than the predefined jump threshold value, a setpoint value (IGA_SP) of an ignition angle is adapted such that a modeled value curve of the checkpoint is determined during valve lift switching (V_LIFT) in the determined operating point of the internal combustion engine taking into account the adjusted nominal value (IGA_SP) of the ignition angle. Operation variable has no further value jump or that at least the further value jump is smaller than the predetermined jump threshold value. The determined setpoint (IGA_SP) of the ignition angle is stored. In a further valve lift changeover (V_LIFT) in the determined operating point of the internal combustion engine, the ignition angle is adjusted as a function of the adjusted desired value (IGA_SP) of the ignition angle.

Description

The The invention relates to a method and an apparatus for operating an internal combustion engine. The internal combustion engine comprises a cylinder and an intake tract. The intake system communicates depending on a switching position of a gas inlet valve with a combustion chamber of the cylinder. Furthermore, the internal combustion engine comprises a valve lift adjusting device, by which a valve lift of the gas inlet valve is adjustable. To the Operating the internal combustion engine are in a predetermined time window to a valve lift switching an operating point of the internal combustion engine and determines a value course of a test operating variable.

From the DE 103 56 257 A1 For example, a method and an apparatus for controlling an internal combustion engine is known. The internal combustion engine has a suction pipe which is guided toward an inlet of a cylinder. At the inlet of the cylinder, a gas inlet valve is arranged. The internal combustion engine also has a valve drive for the gas inlet valve, by means of which the valve lift of the gas inlet valve is adjustable in at least two stages. Furthermore, an injection valve is provided which meters fuel and a spark plug, by means of which the ignition angle of the air / fuel mixture is controlled. The internal combustion engine is controlled by the fact that, if a switching of the valve lift is to be carried from one stage to another stage, in the intake of the cylinder at least once fuel is metered and at least the last metering of fuel depends on whether a circuit to the valve lift of one to the other stage actually occurred.

DE 102 31 143 A1 discloses a method for controlling the valve lift with the objective of reducing the torque jump occurring during valve lift switching. According to this method, the valve lift switching is performed first for a part of the cylinders and then for the remaining part of the cylinders. It is also proposed to compensate for the torque change occurring by the valve lift switching by a corresponding Zündwinkeleingriff. As a criterion for the valve lift switching is checked whether a sufficient Zündwinkeleingriff is even possible. For this purpose, it is checked whether the difference between a base ignition angle and a minimum ignition angle exceeds a certain threshold. If this is not the case, valve lift switching is suppressed or performed only for a smaller number of cylinders.

The The object of the invention is a method and a device to provide for operating an internal combustion engine, the or which is simply a precise one and comfortable operation of the internal combustion engine allows.

The Task is solved by the characteristics of the independent Claims. Advantageous embodiments of the invention are specified in the subclaims.

The Invention is characterized according to a first Aspect of the invention by a method and an apparatus for Operating an internal combustion engine. The internal combustion engine has one Cylinder and an intake tract. The intake system communicates depending on a switching position of a gas inlet valve with a combustion chamber of the cylinder. Furthermore, the internal combustion engine comprises a valve lift adjusting device, by which a valve lift of the gas inlet valve is adjustable. To the Operating the internal combustion engine are in a predetermined time window to a valve lift switching an operating point of the internal combustion engine and determines a value course of a test operating variable. The test operating size is representative for a Torque produced by the internal combustion engine. It checks if the Determined value curve of the test operation size one Has a value jump greater than is a predetermined jump threshold. If the value jump greater than is the predetermined jump threshold, becomes a target value of a firing angle the internal combustion engine adapted so that in the valve lift in the determined operating point of the internal combustion engine taking into account the adjusted nominal value of the ignition angle a modeled value curve of the test operating variable no further value jump or that at least the further value jump is less than is the predetermined jump threshold. The determined setpoint the ignition angle will be saved. In another valve lift in the determined operating point of the internal combustion engine becomes the ignition angle dependent adjusted by the adjusted setpoint of the ignition angle.

The ignition angle is representative of an ignition timing with respect to a crankshaft angle of a crankshaft of the internal combustion engine. Further, the ignition angle is preferably the crankshaft angle by which the crankshaft of the engine has rotated at ignition timing from a top dead center of a piston of the internal combustion engine. The adjusted setpoint of the ignition angle allows for the further valve lift switching the adjustment of the valve lift without the value jump of the torque or at least with the value jump of the torque, which is smaller than the predetermined jump threshold. Advantageously, this is independent of a history of the internal combustion engine and of any structural deviations of the internal combustion engine relative to a reference internal combustion engine, based on a reference setpoint of the ignition angle determined becomes. The structural deviations could be, for example, production-related tolerances of the components of the internal combustion engine. Thus, this simply contributes to a precise and comfortable operation of the internal combustion engine.

The Invention is characterized according to a second Aspect of the invention by a method and an apparatus for Operating the internal combustion engine. The internal combustion engine has one Cylinder and an intake tract. The intake tract communicates depending on the switching position of the gas inlet valve with the combustion chamber of the cylinder. Furthermore, the internal combustion engine comprises the valve lift adjusting device, by which the valve lift of the gas inlet valve is adjustable. To the Operating the internal combustion engine are in a predetermined time window to the valve lift switching the operating point of the internal combustion engine and the value curve of the test operating variable is determined. The test operating size is representative for the Torque produced by the internal combustion engine. It checks if the determined value curve of the test operating variable the value jump that is larger than is the predetermined jump threshold. If the value jump is greater than is the predetermined jump threshold, it is checked whether to avoid or reduce of the value jump in the determined operating point, the reference value of firing angle in the direction of early or late must be moved. The setpoint of the ignition angle is determined in the Operating point shifted by a predetermined angle in the direction of early, if to avoid or reduce the value jump in the determined Operating point of the setpoint of the ignition angle in the direction of early must be moved. The setpoint of the ignition angle is determined in the Operating point shifted by the predetermined angle value in the direction of late, if to avoid or reduce the value jump in the determined Operating point of the setpoint of the ignition angle towards late must be moved. The shifted nominal value of the ignition angle will be saved. In the further valve lift in the determined Operating point of the internal combustion engine, the ignition angle depends on the shifted setpoint of the ignition angle adjusted.

Of the shifted setpoint of the ignition angle allows at the further valve lift switching the adjustment of the valve lift without the value jump of the torque or at least with the value jump of torque less than the predetermined skip threshold is. However, if the value jump of the test operating quantity continues to occur, then becomes the setpoint of the ignition angle moved further. Moving towards early means in this context, that the firing angle is reduced and that based on a given crankshaft angle earlier ignited becomes. Towards late shift in this context means that the ignition angle is enlarged and that is ignited later based on the predetermined crankshaft angle. Advantageously, this is also independent of the previous history the internal combustion engine and the structural deviations of the internal combustion engine across from the reference internal combustion engine. Thus, this simply contributes to a precise and comfortable operation of the internal combustion engine at. The default Angle value, for example, in a range between a half and two degrees are located.

Of the The first and second aspects of the invention are both characterized from that on the basis of the test operating size of the appropriate Ignition angle adapted becomes and that therefore independent from the reference internal combustion engine, each internal combustion engine individual and preferably optimal ignition angle in the valve lift having.

In an advantageous embodiment of the first and / or second aspect the invention, the target value of the ignition angle is dependent on a predetermined reference setpoint of the ignition angle and depending on a correction setpoint of the ignition angle determined. To avoid the value jump, the correction setpoint the ignition angle customized. This makes possible, a rough setting of the operation of the internal combustion engine under Specify other by the reference setpoint of the ignition angle and still by the correction setpoint of the ignition angle the individual Internal combustion engine to consider.

In a further advantageous embodiment of the first and / or second Aspect of the invention, the correction target value has an additive and / or a multiplicative component of the correction target value of the ignition angle on. The additive component of the correction setpoint of the ignition angle allows one absolute correction of the predetermined reference setpoint of the ignition angle. The multiplicative component of the correction target value of the ignition angle allows a Correction of the preset reference setpoint of the ignition angle relative to the predetermined reference setpoint of the ignition angle.

In a further advantageous embodiment of the first and / or second Aspect of the invention, the target value of the ignition angle is adjusted only then or shifted if at least one predetermined adaptation condition Fulfills is. This contributes to it in, to avoid the value of the torque due to torque an unusual one Operating situation of the internal combustion engine to adapt or Shifting the setpoint of the ignition angle leads.

In a further advantageous embodiment of the first and / or second aspect of the invention, the setpoint of the ignition angle is adjusted or shifted only when the internal combustion engine is in quasi-stationary operation. The quasi-stationary operation is characterized in that at least a predetermined operating variable changes only slightly in a predetermined period of time. The predetermined operating variable can be, for example, a load variable, a load variable change, a rotational speed or a speed change of the internal combustion engine.

The advantageous embodiments of the method can be readily advantageous Embodiments of the devices are transmitted.

The The invention is described below with reference to schematic drawings explained in more detail.

It demonstrate:

1 an internal combustion engine,

2 a valve drive of the internal combustion engine,

3 a first program for operating the internal combustion engine,

4 a second program for operating the internal combustion engine.

elements same construction or function are cross-figurative with the same Reference number marked.

An internal combustion engine ( 1 ) comprises an intake tract 1 , an engine block 2 , a cylinder head 3 and an exhaust tract 4 , The intake tract 1 preferably includes a throttle 5 and a collector 6 and a suction tube 7 leading to a cylinder Z1-Z4 via an inlet passage in the engine block 2 is guided. The engine block 2 further comprises a crankshaft 8th , which has a connecting rod 10 with a piston 11 of the cylinder Z1 is coupled. The internal combustion engine is preferably arranged in a motor vehicle.

The exhaust tract 4 includes an exhaust gas catalyst 24 and an unspecified exhaust gas probe upstream of the catalytic converter.

The cylinder head 3 includes a valvetrain with at least one gas inlet valve 12 , at least one gas outlet valve 13 and valve actuators 14 . 15 ,

A camshaft 18 is provided ( 2 ), the cams 16 . 17a . 17b includes that on the gas inlet valve 12 act. Furthermore, a valve lift adjusting device 19 provided, which is designed such that either through the cam 16 with a small valve lift X1 for acting on a plunger of the gas inlet valve 12 can be introduced or in another switching position of the valve lift adjustment 19 the cams 17a . 17b with a large valve lift X2 acting on the plunger of the gas inlet valve 12 can be introduced. The valve lift adjusting device 19 may be part of a gas inlet valve, for example 12 be associated bucket tappet. However, it can also act as another mechanically between the cams 16 . 17a . 17b be formed switched element. It can also be designed such that it, for example, the camshaft 18 axially displaced and can be done in this way switching from a higher to a lower valve lift or vice versa. Furthermore, the internal combustion engine can have one or more further valve lift adjusting devices 19 include, the other gas inlet valves 12 and / or one or more gas outlet valves 13 assigned.

The cylinder head 3 further comprises an injection valve 22 and a spark plug 23 , Alternatively, the injection valve 22 also in the intake manifold 7 be arranged.

A control device 25 is provided, the sensors are assigned, which detect different parameters and each determine the value of the measured variable. Operating variables include the measured variables and variables derived therefrom of the internal combustion engine. Operating variables can be representative of an operating state of the internal combustion engine. The control device 25 determined depending on at least one of the operating variables at least one manipulated variable, which are then converted into one or more control signals for controlling the actuators by means of appropriate actuators. The control device 25 can also be referred to as a device for operating the internal combustion engine, in particular in the valve lift.

The sensors are a pedal position transmitter 26 , the accelerator pedal position of an accelerator pedal 27 detected, an air mass sensor 28 , the air mass flow upstream of the throttle 5 detected, a throttle position sensor 30 , which is an opening degree of the throttle valve 5 detected, a first temperature sensor 32 sensing an intake air temperature, an intake manifold pressure sensor 34 that produces a manifold pressure in the collector 6 detected, a crankshaft angle sensor 36 , which detects a crankshaft angle, which is then assigned a speed. Further, a camshaft angle sensor 39 provided, which detects a camshaft angle. Depending on the embodiment of the invention, any subset of said Sen sensors or additional sensors may be present.

The actuators are, for example, the throttle 5 , the gas inlet and outlet valves 12 . 13 , the valve lift adjusting device 19 , the injection valve 22 and / or the spark plug 23 ,

Next the cylinder Z1-Z4 are preferably also more cylinders Z1-Z4 provided, which then also associated with corresponding actuators.

A first program ( 3 ) for operating the internal combustion engine is preferably on a storage medium of the control device 25 saved. The first program is used to suitably adapt an ignition angle of the internal combustion engine such that no or at least only a negligible torque jump occurs during a valve lift switching V_LIFT. The first program is preferably started near a start of the internal combustion engine in a step S1. If necessary, variables are initialized in step S1.

In a step S2 is checked whether at least one adaptation condition AD_CDN is present. The adaptation condition AD_CDN can be, for example, a quasi-stationary operation of the internal combustion engine. The quasi-stationary Operation of the internal combustion engine is characterized in that At least a predetermined operating size during a predetermined period of time only slightly changes. For example can the change the size of the company in the predetermined time less than a predetermined threshold be. The default operating size can for example, a load size, a Last resizing, be a speed and / or a speed change of the internal combustion engine. If the condition of step S2 is satisfied, then the processing continued in a step S3. Is the condition of the step S2 not fulfilled, so the processing is continued again in step S1.

In Step S3 checks whether the Ventilhubumschaltung V_LIFT to be performed. Is the condition of step S3, so the processing is continued in a step S4. Is the condition of step S3 is not fulfilled, so the processing is continued again in step S1.

In the step S4 is in a predetermined time window to the valve lift V_LIFT determines a value course of a test operating quantity, the representative is for a caused by the internal combustion engine torque. The test operating size can For example, be the torque itself, the test operating size can however, also the speed and / or a gradient ESS_GRD of a speed signal Be ESS. If the test operating variable is the torque, Thus, in step S4, preferably, a torque signal TQ_SIG which corresponds to the value curve of the test farm size. Further at step S4 becomes a current operating point of the internal combustion engine determined. The operating point of the internal combustion engine is by a Vector of predetermined operating variables of the internal combustion engine characterized. The predetermined operating variables, for example, the load size, a Last resizing, the speed and / or a temperature of an oil and / or a cooling water be the internal combustion engine. The operating point is determined so that in the further course of an assignment of the ignition angle to the corresponding operating point possible is because different ignition angles in different operating points can be adjusted.

In a step S5 is checked whether the value curve TQ_SIG of the torque has a smoothing value SMOOTH has, i. H. It is checked whether the value course TQ_SIG of the torque has a value jump that is smaller than a is predetermined jump threshold. Is the condition of the step S5 meets, so the processing is continued again in step S1. is does not satisfy the condition of step S5, the processing becomes continued in a step S6.

In In step S6, a correction target value IGA_COR is dependent on the value curve TQ_SIG of the torque determined. The correction setpoint IGA_COR is determined so that a modeled value curve of the test operation size in the Ventilhubumschaltung V_LIFT in the determined operating point the Value jump no longer has or the value jump at least smaller is the default skip threshold.

A setpoint IGA_SP of the ignition angle is composed of the correction setpoint IGA_COR and a reference setpoint IGA_REF of the ignition angle. Preferably, a model is developed on an engine test bench with a reference motor, by means of which the reference desired value IGA_REF of the ignition angle can preferably be determined in each operating point of the internal combustion engine. The model may comprise one or more arithmetic instructions and / or one or more characteristic diagrams, which are preferably stored on the storage medium of the control device 25 be deposited. The correction setpoint IGA_COR takes into account a series dispersion during the manufacture of the internal combustion engine. In series production, small differences from one internal combustion engine to another internal combustion engine occur during the manufacture of the internal combustion engine. Thus, each internal combustion engine of the same type shows different behavior within a predetermined tolerance. So with a Brennkraftmaschi ne, which is not the reference internal combustion engine, with proper operation taking into account the reference target angle IGA_REF of the ignition angle the value jump in the valve lift switch V_LIFT have, even if the reference internal combustion engine in the same operating point in the valve lift switch V_LIFT does not have the value jump. If the value jump, which is greater than the jump threshold, occurs in the valve lift V_LIFT, then the model or at least one of the maps of the model is determined by the reference target angle IGA_REF of the ignition angle, depending on the correction setpoint IGA_COR, that in a further valve lift switching in the same operating point, taking into account the adjusted setpoint IGA_SP the value jump no longer occurs and / or is less than the jump threshold value.

Preferably the correction setpoint IGA_COR is composed of an additive component ADD_COR and / or a multiplicative component MUL_COR according to in the step S6 calculation rule together. The additive Component ADD_COR enabled it, at individual operating points or over several operating points an absolute value to the reference setpoint IGA_REF of firing angle to add or deduct. The multiplicative component MUL_COR enabled it, the reference setpoint IGA_REF of the ignition angle with a predetermined Factor down or enlarge, resulting in an adjustment the setpoint (IGA_SP) of the ignition angle relative to the reference setpoint (IGA_REF) of the firing angle.

In In a step S7, the desired value IGA_SP of the ignition angle is dependent on the correction setpoint IGA_COR and the reference setpoint IGA_REF of the ignition angle determined.

In In a step S8, the first program can be ended. Preferably However, the program is during the operation of the internal combustion engine regularly executed.

Alternatively or additionally, a second program ( 4 ) for operating the internal combustion engine on the storage medium of the control device 25 be stored. The second program is used to suitably adapt the ignition angle of the internal combustion engine so that no or at least only a negligible torque jump occurs at a valve lift V_LIFT. The second program is preferably started in a step S9 in accordance with the step S1 of the first program.

steps S10 to S13 of the second program are successively corresponding processed steps S2 to S5 of the first program.

In In a step S14, it is checked whether the target value IGA_SP of the ignition angle towards late RET must be shifted so that the value curve TQ_SIG of the torque at the next valve lift switching V_LIFT no longer has the value jump or the value jump which is smaller than the predetermined jump threshold. If the condition of step S14 is satisfied, then the processing continued in a step S15. Is the condition of the step S14 not met, so the processing is continued in a step S16.

In the step S15 becomes dependent from a predetermined angle value ANG the correction setpoint IGA_COR determined, preferably after the specified in step S15 Calculating rule. This causes the setpoint (IGA_SP) of the firing angle is enlarged and thus the ignition angle towards late RET is adjusted.

In the step S16 becomes dependent from a predetermined angle value ANG the correction setpoint IGA_COR determined, preferably after the specified in step S16 Calculating rule. This causes the setpoint (IGA_SP) of the firing angle is reduced and thus the ignition angle in the direction of early is adjusted.

In a step S17 is in accordance with the step S7 of the first program determines the setpoint (IGA_SP).

In In a step S18, the second program according to the step S8 of the first Program will be terminated.

The invention is not limited to the specified embodiments. For example, the internal combustion engine may have an alternative valve lift switching. Further, the first and / or second program may be implemented in a program that controls the valve lift V LIFT. Further, between steps S14 and S15 and / or between steps S14 and S16, it may be checked whether the ignition angle may be further shifted because of the shifting of the ignition angle by an ignitability of an air / fuel mixture in the combustion chamber 9 the internal combustion engine limits are set.

Claims (8)

Method for operating an internal combustion engine with a cylinder (Z1-Z4) and with an intake tract ( 1 ), which depends on a switching position of a gas inlet valve ( 12 ) with a combustion chamber ( 9 ) of the cylinder (Z1-Z4) communicates with a valve lift adjusting device through which a Ven tilhub of the gas inlet valve ( 12 ) is adjustable, in which - in a given time window to a valve lift (V_LIFT) an operating point of the internal combustion engine and a value curve of a test operating variable are determined, which is representative of a caused by the internal combustion engine torque, - is checked whether the determined value curve the test operating variable has a value jump that is greater than a predefined jump threshold value, if the value jump is greater than the predefined jump threshold value, a setpoint value (IGA_SP) of an ignition angle is adapted such that the valve lift switchover (V_LIFT) in the determined operating point Internal combustion engine taking into account the adjusted setpoint (IGA_SP) of the ignition angle has a modeled value curve of the test operation size no further value jump or that at least the further value jump is smaller than the predetermined jump threshold value, - the determined setpoint (IG A_SP) of the ignition angle is stored, - in a further valve lift (V_LIFT) in the determined operating point of the internal combustion engine, the ignition angle is adjusted depending on the adjusted nominal value (IGA_SP) of the ignition angle. Method for operating an internal combustion engine with a cylinder (Z1-Z4) and with an intake tract ( 1 ), which depends on a switching position of a gas inlet valve ( 12 ) with a combustion chamber ( 9 ) of the cylinder (Z1-Z4) and with a valve lift adjusting device, by which a valve lift of the gas inlet valve ( 12 ) is adjustable, in which - in a given time window to a valve lift (V_LIFT) an operating point of the internal combustion engine and a value curve of a test operating variable are determined, which is representative of a caused by the internal combustion engine torque, - is checked whether the determined value curve the test operating variable has a value jump that is greater than a predetermined jump threshold value, - if the value jump is greater than the predetermined jump threshold, it is checked whether to avoid or reduce the value jump in the determined operating point, a target value (IGA_SP) of the ignition angle in the direction must be moved early or late, - the target value (IGA_SP) of the ignition angle is shifted in the determined operating point by a predetermined angle toward early, if to avoid or reduce the value jump in the determined operating point of the setpoint (IGA_SP) the ignition angle must be shifted in the direction of early, - the target value (IGA_SP) of the ignition angle in the determined operating point by the predetermined angular value in the direction of late (RTD) is shifted, if to avoid or reduce the value jump in the determined operating point of the setpoint (IGA_SP) of the ignition angle must be shifted in the late direction, - the shifted setpoint (IGA_SP) of the ignition angle is stored, - in a further valve lift (V_LIFT) in the determined operating point of the internal combustion engine, the ignition angle is adjusted depending on the shifted setpoint (IGA_SP) of the ignition angle. Method according to one of the preceding claims, in the setpoint (IGA_SP) of the ignition angle dependent from a given reference setpoint (IGA_REF) of the firing angle and dependent is determined by a correction setpoint (IGA_COR) of the ignition angle and in which, to avoid the value jump, the correction setpoint (IGA_COR) the ignition angle adjusted or moved. The method of claim 3, wherein the correction setpoint (IGA_COR) of the ignition angle an additive and / or a multiplicative component (ADD_COR, MUL_COR) of the correction setpoint (IGA_COR) the ignition angle having. Method according to Claim 4, in which the desired value (IGA_SP) the ignition angle adjusted or moved only if at least one predetermined Adaptation condition (AD_CDN) fulfilled is. Method according to Claim 5, in which the desired value (IGA_SP) the ignition angle only adjusted or moved when the internal combustion engine in quasi-stationary Operation is located. Device for operating an internal combustion engine with a cylinder (Z1-Z4) and with an intake tract ( 1 ), which depends on a switching position of a gas inlet valve ( 12 ) with a combustion chamber ( 9 ) of the cylinder (Z1-Z4) and with a valve lift adjusting device, by which a valve lift of the gas inlet valve ( 12 ), wherein the device is configured to - determine an operating point of the internal combustion engine and a value curve of a test operating variable, which is representative of a torque caused by the internal combustion engine, in a predetermined time window to a valve lift (V_LIFT), - Check whether the determined value course of the test operating variable has a value jump that is greater than a predefined jump threshold value, - Adjusting a desired value (IGA_SP) of an ignition angle, so that during the valve lift switching (V_LIFT) in the determined operating point of the internal combustion engine taking into account the adjusted setpoint (IGA_SP) of the ignition angle a modeled value curve of the test operating variable has no further value jump or that at least the other Value jump is smaller than the predefined jump threshold value, if the value jump is greater than the predefined jump threshold value, - storing the determined setpoint value (IGA_SP) of the ignition angle, - adjusting the ignition angle depending on the adjusted nominal value (IGA_SP) of the ignition angle during a further valve lift switchover (V_LIFT) in the determined operating point of the internal combustion engine. Device for operating an internal combustion engine with a cylinder (Z1-Z4) and with an intake tract ( 1 ), which depends on a switching position of a gas inlet valve ( 12 ) with a combustion chamber ( 9 ) of the cylinder (Z1-Z4) and with a valve lift adjusting device, by which a valve lift of the gas inlet valve ( 12 ), wherein the device is configured to - determine an operating point of the internal combustion engine and a value curve of a test operating variable, which is representative of a torque caused by the internal combustion engine, in a predetermined time window to a valve lift (V_LIFT), - Check whether the ascertained value course of the test operating variable has a value jump that is greater than a predefined jump threshold value, - checking whether a setpoint value (IGA_SP) of the ignition angle has to be shifted in the direction of early or late in order to avoid or reduce the value jump in the determined operating point if the value jump is greater than the predetermined jump threshold value, shifting the setpoint value (IGA_SP) of the ignition angle in the determined operating point in the direction of early, if to avoid or reduce the value jump in the determined operating point of the setpoint (IGA_SP) of Zünd angle must be shifted in the direction of early, - shift the setpoint (IGA_SP) of the ignition angle in the determined operating point in the direction of late (RTD), if to avoid or reduce the value jump in the determined operating point of the setpoint (IGA_SP) of the ignition angle in the direction of late ( RTD) must be shifted, - Store the shifted setpoint (IGA_SP) of the ignition angle, - Adjust the ignition angle depending on the shifted setpoint (IGA_SP) of the ignition angle in another valve lift (V_LIFT) in the determined operating point of the internal combustion engine.