DE102017201911A1 - Method for operating a motor vehicle - Google Patents

Abstract

The invention relates to a method for operating a motor vehicle, in which a manipulated variable (M) for driving a drive motor (2) of the motor vehicle to a default value (V) is determined by carrying out the following steps: - providing operating variable adjustment functions (11) providing a target value depending on the operating point, providing a plurality of operating variable intervention functions (12, 13), which are each designed to specify a minimum and / or a maximum limiting value (M, ... M) as a function of the operating point, and calculating the control value (M) according to a predetermined operation amount calculation path having the operation amount adjustment functions (11) and the plurality of operation amount engagement functions (12, 13); determining a range of allowable target values for the control value (M) by taking into account the respective minimum and / or maximum limitation values (M .. M); wherein it is detected which of the plurality of operating variable intervention functions (12, 13) is associated with the minimum and / or maximum limiting value (M ... M) to which the manipulated variable (M) has been set when the manipulated variable (M) is set to a value the minimum and / or maximum limiting values (M ... M) have been set, - operating the motor vehicle depending on the determined operating variable intervention function (12, 13).

Description

Technical area

The invention relates generally to methods of operating a motor vehicle. Furthermore, the present invention relates to devices for carrying out such methods and motor systems with such devices.

State of the art

Drive motors of motor vehicles are usually operated by means of control units. The control units take on a variety of functions and determine based on a default size to be provided by the drive motor control value as the drive torque. The drive torque to be provided is determined from the default torque based on a plurality of concurrent protection functions and operation quantity engagement functions. These are determined by means of successive algorithms in a so-called operational size adjustment path, e.g. considered a moment calculation path. The operation amount engagement functions may include, for example, gear shift requests, requirements of operational size intervention of a stability control, and the like.

In operation, a target value is specified as a function of the operating point depending on operating point adjustment functions, depending on the operating point. Furthermore, a plurality of operating variable intervention functions are provided, each of which is designed to specify a minimum and / or a maximum limiting value as a function of the operating point. A set value is calculated according to the predetermined operation amount calculation path with the operation amount adjustment functions and the plurality of operation amount engagement functions, and a range of allowable target values for the manipulated value is determined by taking the respective minimum and / or maximum limitation values into consideration.

However, it is often unclear whether - and in which situations - consideration has been given to minimum and / or maximum limiting values corresponding to which size adjustment function.

Disclosure of the invention

According to the invention a method for operating a motor vehicle according to claim 1 and by a device and an engine system according to the independent claims are achieved.

Further advantageous embodiments of the present invention are specified in the dependent claims from.

• - Bereitstellen von Betriebsgrößenanpassungsfunktionen, die ausgebildet sind, um betriebspunktabhängig einen Zielwert vorzugeben;
• - Bereitstellen einer Mehrzahl von Betriebsgrößeneingriffsfunktionen, die jeweils dazu ausgebildet sind, um betriebspunktabhängig einen minimalen und/oder einen maximalen Begrenzungswert vorzugeben;
• - Berechnen des Stellwerts entsprechend einem vorgegebenen Betriebsgrößenberechnungspfad mit den Betriebsgrößenanpassungsfunktionen und der Mehrzahl der Betriebsgrößeneingriffsfunktionen;
• - Bestimmen eines Bereichs zulässiger Zielwerte für den Stellwert durch Berücksichtigen der jeweiligen minimalen und/oder maximalen Begrenzungswerte; wobei bei einer Begrenzung des Stellwerts die betreffende, den Stellwert begrenzende Betriebsgrößeneingriffsfunktion ermittelt wird;
• - Betreiben des Kraftfahrzeugs abhängig von der ermittelten Betriebsgrößeneingriffsfunktion.

According to a first aspect, in a method for operating a motor vehicle, in which a control value for driving a drive motor of the motor vehicle is determined as a function of a predefined variable, it is provided to carry out the following steps:

• Providing operational size adjustment functions configured to specify a target value dependent on the operating point;
• Providing a plurality of operation quantity engagement functions, which are each designed to specify a minimum and / or a maximum limitation value as a function of the operating point;
• Calculating the manipulated value according to a predetermined operation amount calculation path with the operation amount adjustment functions and the plurality of operation amount engagement functions;
• Determining a range of allowable target values for the manipulated variable by taking into account the respective minimum and / or maximum limiting values; in the case of a limitation of the manipulated variable, the respective operating variable intervention function limiting the manipulated variable is determined;
• - Operating the motor vehicle depending on the determined Betriebsgrößeneingriffsfunktion.

An operating point may be defined by values for one or more of the following variables: load and / or speed of the drive motor, temperature, air pressure, diagnostic data.

An idea of the above method is to detect, in cases where the manipulated variable has been determined by one of the operation amount engaging functions, which of the plurality of operation amount input functions for limiting the manipulated value is based on the respective minimum and / or maximum limiting value. In this way, it is possible to significantly reduce the amount of data to be collected and archived. With the data, e.g. Performance deviations are detected and analyzed by a target power of the drive motor, are controlled, whether components of the drive motor are operated smoothly or the life of the drive motor can be increased.

In the method, the order of the steps may vary. For example, the step of "providing a plurality of operation amount engaging functions ..." before the step "providing Operational Size Adjustment Functions ... "or these two steps are executed at the same time. Furthermore, several steps can be combined or integrated. For example, the steps "Calculating the manipulated variable ..." and "Determining a range of permissible target values for the manipulated variable ..." can also be combined and integrated. This means that in a serial procedure, the manipulated variable is first calculated and then compared with minimum and maximum values, while in the combined and integrated procedure, the minimum and maximum values are taken into account directly when determining the manipulated value.

According to one embodiment, to determine the selected operational size engagement function, the value of the predetermined control value may be compared to the respective minimum and / or maximum limit values of the plurality of operational size engagement functions, and the selected operational size engagement function is provided with a flag whose associated minimum and / or maximum limiting value is predetermined Control value corresponds. Thus, a determination of the selected operating variable engagement function takes place by a comparison of the minimum and / or maximum limiting value predetermined by the respective operating variable engagement function with the actually preset control value. In other words, it is not the selected operating variable intervention functions that are determined directly, but indirectly by a comparison of their assigned values with the actual control value. Thus, in a particularly simple and resource-saving manner, the selected operational size intervention functions can be determined.

According to a further embodiment, a plurality of operating-size-engaging functions may be provided with a characteristic as selected operating-variable-engaging functions if the respective plurality of selected operating-variable-engaging functions are each assigned an equal-sized minimum and / or maximum limiting value. In this way, the case can also be taken into account if two operating variable intervention functions each specify an equal limit value.

According to a further embodiment, a difference may be determined from an intermediate result for an engine value and the minimum and / or maximum limit value, and the further operational size engagement function is flagged when the difference is less than a threshold value. The intermediate result is an engine value determined without considering the limit values. In other words, the range of possible values for the intermediate result is unlimited. The intermediate result for an engine value may be a current engine torque. Thus, the threshold comparison can eliminate measurement errors and other inaccuracy. This way, particularly revealing data can be collected.

According to a further embodiment, at least one of the selected operation size engagement function can be assigned a weighting measure. The evaluation measure of the respective operation amount engagement function is e.g. incremented each time this operation size engagement function is the selected operation size engagement function. Thus, data about which of the plurality of operational size intervention functions frequently sets a limit value can be easily obtained.

According to a further embodiment, the evaluation measure can be compared with a threshold value, and parameters of the drive motor are detected when the threshold value is exceeded by the evaluation criterion. The parameters may be e.g. to act load conditions, speeds and / or a gear. Thus, the operating variable intervention functions are detected, which specify a limiting value particularly frequently. It also effectively reduces the amount of data to capture and archive, conserving computing and storage resources.

According to another embodiment, the score may be weighted by a weighting factor. The weight factor may e.g. depend on the frequency with which an operating limit function specifies a control value. Further, the weighting factor may depend on load conditions and operating conditions of the drive motor and / or on a difference between the limit value and an actual value. Indirectly, further information may be received regarding the load conditions and operating conditions of the drive motor or the extent to which the manipulated variable has been limited by the limit value.

According to a further embodiment, the evaluation measure can be compared with a reference value, and upon exceeding of the reference value by the evaluation measure, parameters of the motor vehicle are adjusted in order to bring about a reduction of the evaluation measure. If, for example, the drive motor of the motor vehicle delivers power values which essentially do not correspond to its desired power values, for example because it supplies too low a torque, the determined weighting value can be evaluated in order to determine which of the Operation size intervention functions were active and under what conditions. Thus, a recalibration of the parameters can be performed to z. B. adjust the power values.

According to a further embodiment, the evaluation measure can be compared with a comparison value, and if the comparison value is exceeded by the evaluation measure, a component malfunction or failure is assigned to the evaluation measure of the motor vehicle. Thus, it can be determined whether components of the drive motor of the motor vehicle are working properly. For example, For example, permanently overheating the drive motor can lead to a high level of judgment related to a limiting function intended to prevent overheating. Thus, a connection with the cooling can be made here. In this way, components can be monitored that are in connection with a limiting function. This simplifies the determination and removal of error causes.

According to a further embodiment, the evaluation measure can be compared with a predetermined control value, and parameters of the motor vehicle are adapted to an exceeding of the control value by the evaluation measure in order to effect a reduction of the aging of the drive motor of the motor vehicle.

As the drive motor ages, its performance also changes and decreases. If, however, an unchanged high torque is required, this can lead to damage. However, the limiting functions of the aging can be adjusted so as to achieve an extension of the life of the drive motor. Thus, by adjusting parameters, an extension of the service life of the drive motor can be achieved.

According to a further aspect, an apparatus and an engine system are provided with such a device.

list of figures

• 1 eine schematische Darstellung eines Motorsystems mit einem Steuergerät;
• 2 eine Blockdarstellung für einen Betriebsgrößenberechnungspfad als Algorithmus zur Berechnung eines Stellwerts in dem Steuergerät;
• 3 ein Ablaufdiagramm eines Verfahrens zur Bestimmung der ausgewählten Betriebsgrößeneingriffsfunktion,
• 4 Ergebnisse von Klassifizierungsvorgängen,
• 5 ein Ablaufdiagramm zur Bestimmung von Gewichtsfaktoren,
• 6 ein Ablaufdiagramm eines Kalibrierungsverfahrens,
• 7 ein Ablaufdiagramm eines Diagnoseverfahrens, und
• 8 ein Ablaufdiagramm eines Re-Kalibrierungsverfahrens.

Embodiments are explained below with reference to the accompanying drawings. Show it:

• 1 a schematic representation of an engine system with a control unit;
• 2 a block diagram for a Betriebsgrößenberechnungspfad as algorithm for calculating a control value in the control unit;
• 3 a flow chart of a method for determining the selected operational size intervention function,
• 4 Results of classification processes,
• 5 a flow chart for determining weight factors,
• 6 a flowchart of a calibration method,
• 7 a flowchart of a diagnostic method, and
• 8th a flow chart of a re-calibration process.

Description of embodiments

1 schematically shows an engine system 1 for a motor vehicle with a drive motor 2 and a controller 3 , The drive motor 2 may correspond to or include an internal combustion engine, such as a gasoline or diesel engine, or an electric drive. Alternatively, the drive motor 2 also be designed as a hybrid drive.

The drive motor 2 is designed so that this in a suitable manner by the control unit 3 can be controlled to one of the control unit 3 predetermined control value M in the present embodiment to be converted into an actual drive torque. This can be achieved, for example, in an internal combustion engine by specifying an amount of fuel to be injected (diesel engine), by presetting an air charge to be provided (gasoline engine) and / or by specifying a motor current (electric drive).

The control unit 3 determined based on a default variable V, for example, a driver's desired torque as a default torque, operating point dependent the control value M. The in the control unit 3 considered operating point can by operating conditions of the drive motor 2 , such as its speed, temperature, pressures, fresh air mass flow and the like may be defined.

Furthermore, the operating conditions may be defined by state variables of the motor vehicle, such as a lateral acceleration, one or more wheel speeds, slope or slope of the road and the like. The default quantity V and the operating conditions indicating the operating point are taken into account in an operation amount calculation path to determine the manipulated variable M. The determination of the control value M takes place cyclically in computing cycles of usually between 5 ms and 50 ms duration.

In 2 schematically a Betriebsgrößenberechnungspfad is shown simplified. The operation amount calculation path has a plurality of operation amount adjustment functions 11 , Operation size limiting functions 12, 13, which are selected and / or prioritized depending on an operating point. The farm size adjustment functions 11 calculate or manipulate a predetermined or provided target value to finally determine a manipulated variable M. The operating size limiting function 12 limits the target value depending on the operating point to a maximum target value and the operating size limiting function 13 limits the target value operating point-dependent to a minimum target value.

• - Funktion zur Berechnung eines Zielwerts aus einer Fahrpedalstellung,
• - eine automatische Geschwindigkeitsregelungsfunktion,
• - Funktion zum Koordinieren der Berechnungen der automatischen Geschwindigkeitsregelung und der Fahrervorgabe,
• - Funktionen zur Berechnung eines Fahrbarkeitsfilters,
• - Werteingriff von einem Stabilitätssystem,
• - Funktion zur Koordinierung von Interventionen des Stabilitätssystems,
• - Funktion für Interventionen von einem Getriebesteuergerät,
• - Funktionen zur Koordination von Interventionen von dem Getriebesteuergerät,
• - Funktion zur Berechnung von Wertanforderungen von Zusatzmodulen,
• - Funktion für eine Geschwindigkeitsregelungsberechnung zum Beibehalten der gewünschten Geschwindigkeit,
• - Funktion zur Wertkoordination von einer Geschwindigkeitsregelung,
• - Funktion zur Wertaufteilung zwischen verschiedenen Energiequellen,
• - Funktion zur Berechnungseinstellung der nicht verbrennungsmotorischen Energiequelle, und
• - Funktion zur Berechnung der Wertanforderungen für einen schnellen Eingriff zum Steuern des Antriebsmotors.

The order of calculation of the operation amount adjustment function 11 , the operation size limit function 12 and the operation size limiting function 13 is essentially applicable, but there are provided a number n of operational size intervention functions (in the form of maximum limitation functions 1 and minimum limitation functions). The farm size adjustment functions 11 may include one or more of the following functions:

• Function for calculating a target value from an accelerator pedal position,
• - an automatic cruise control function,
• Function to coordinate the automatic cruise control and driver input calculations,
• Functions for calculating a drivability filter,
• - value intervention of a stability system,
• - function to coordinate interventions of the stability system,
• Function for interventions by a transmission control unit,
• Functions for coordinating interventions by the transmission control unit,
• - function for calculating value requirements of additional modules,
• Function for a cruise control calculation for maintaining the desired speed,
• Function for value coordination of a speed control,
• - function to distribute the value between different energy sources,
• Function for calculating the non - combustion engine energy source, and
• - function to calculate the value requirements for a quick intervention to control the drive motor.

The operation size intervention functions 12 . 13 are used to determine limiting values M _B1 ... M _Bn operating point-dependent and to specify them as limit values. The operation size intervention functions 12 . 13 are separately calculable functions and can be used on different computer cores of a microprocessor of the controller 3 be calculated distributed.

In the present embodiment, the operation amount adjustment function 11 , the operation size limit function 12 and the operation amount limiting function 13 be designed to each determine values for torques and process. Thus, in the present exemplary embodiment, the limiting values M _B1 ... M _Bn are limiting moments and the setting value M is a setting torque. Unlike the present embodiment, the operation amount adjustment function 11 , the operation size limit function 12 and the operation amount limiting function 13 be designed to each determine values for speeds and process.

The control unit 3 Thus, it may be adapted to operating size adjustment functions 11 to be provided, which are designed to specify a target value depending on the operating point. Further, the controller 3 adapted to a plurality of operational size intervention functions 12 . 13 to be provided, each of which is adapted to operating point _{dependent to} specify a minimum and / or a maximum limiting value M _B1 ... M _Bn . Furthermore, the control unit 3 be configured to the manipulated variable M according to the Betriebsgrößenberechnungspfad with the Betriebsgrößenanpassungsfunktionen 11 and the plurality of operational size intervention functions 12 , 13 and to determine a range of allowable target values for the manipulated variable M by taking into account the respective minimum and / or maximum limiting values M _B1 ... M _Bn .

In addition, the control unit 3 be configured to detect which of the plurality of Betriebsgrößeneingriffsfunktionen 12 . 13 the minimum and / or maximum limiting value M _B1 ... M _{Bn is} assigned to which the manipulated variable M has been set when the manipulated variable M has been set to a value of the minimum and / or maximum limiting values M _B1 ... M _Bn .

For this purpose, in the present embodiment, the control unit 3 adapted to the value of the predetermined control value M with the respective minimum and / or maximum limiting values M _B1 ... M _{Bn of} the plurality of Betriebsgrößeneingriffsfunktionen 12 . 13 to compare. The selected farm size intervention function 12 . 13 is provided with a flag W, whose associated minimum and / or maximum limiting value M _B1 ... M _Bn corresponds to the predetermined control value M. The indicator W can be, for example, an entry in a table or a list.

The control unit 3 may be configured such that when multiple selected operational size intervention functions 12 . 13 each specify an equal size minimum and / or maximum limiting value M _B1 ... M _Bn , these Betriebsgrößeneingriffsfunktionen 12 . 13 be provided as a selected Betriebsgrößeneingriffsfunktionen 12, 13 each with a flag W.

wobei R(n) das Bewertungsmaß der aktuellen Periode n, R(n-1) das Bewertungsmaß der vorangehenden Periode (n-1) und W(n) der Gewichtsfaktor ist. Z.B. kann auf ein Überschreiten des Schwellwertes S durch das aktuelle Bewertungsmaß R(n) das Steuergerät 3 Parameter des Antriebsmotors 2 erfassen.Furthermore, in the present embodiment, the control unit 3 be configured to a difference from the associated control value M and the minimum and / or maximum limiting value M _B1 ... M _Bn another Betriebsgrößeneingriffsfunktion 12 . 13 to determine and the other operation size intervention functions 12 . 13 with a flag W for a selected operational size intervention functions 12 . 13 if the difference is smaller than a threshold value. Furthermore, the control unit 3 formed in the present embodiment, the at least one selected Betriebsgrößeneingriffsfunktion 12 . 13 assign a score R, wherein the score R is compared to a threshold. Upon exceeding the threshold value by the evaluation R, the ECU detects 3 Parameters of the drive motor 2 , such as load conditions, speed and / or speed. Finally, the controller 3 designed to weight the score R with a weight factor W. The evaluation measure R for a selected operation size engagement function 12 . 13 can be updated periodically, eg according to the following formula: $$\text{R}\left(\text{n}\right)\mathrm{=}\text{R}\left(\text{n}-1\right)+\text{W}\left(\text{n}\right)\text{.}$$

where R (n) is the judgment measure of the current period n, R (n-1) is the judgment measure of the preceding period (n-1), and W (n) is the weight factor. For example, if the threshold value S is exceeded by the current evaluation measure R (n), the control unit can 3 Parameters of the drive motor 2 to capture.

wobei W(n) der Gewichtsfaktor der aktuellen Periode n, W(n-1) der Gewichtsfaktor Wert der vorangehenden Periode (n-1), LimTrq das aktuelle Moment, CurrTrq das innere Drehmoment des Antriebsmotors 2, No_ccr die Anzahl des Auftretens des Begrenzungswerts, N_occr-con einen weitere Anzahl des Auftretens des Begrenzungswerts, N_{load_st} ist die Anzahl des Auftretens des Begrenzungswerts unter gleichem Lastmoment und N_{eng_st} die Anzahl des Auftretens des Begrenzungswerts bei gleicher Drehzahl ist. Bei Fac1 bis Fac4 handelt es sich um vorbestimmte Faktoren, um den Prozentsatz einer Verteilung zu bestimmen. The weighting factors W (n) for the yardsticks R (n) of the selected operational size engagement functions 12 . 13 can also be updated periodically, eg according to the following formula:

where W (n) is the weighting factor of the current period n, W (n-1) is the weighting factor value of the preceding period (n-1), LimTrq is the current moment, CurrTrq is the internal torque of the drive motor 2 , No _{ccr is} the number of occurrences of the limit _value , N _{occr-con is} an additional number of occurrences of the limit _value , N _{load_st} is the number of occurrences of the limit _value under the same load torque and N _{eng_st is} the number of occurrences of the limit _value for the same rotational speed. Fac1 through Fac4 are predetermined factors to determine the percentage of a distribution.

wobei R‘(n) das Bewertungsmaß der aktuellen Periode n, R‘(n-1) das Bewertungsmaß der vorangehenden Periode (n-1) und W(n) der Gewichtsfaktor sowie K ein weiterer vorbestimmter Faktor zur Gewichtung des Bewertungsmaßes R‘(n) ist.The further evaluation mass R 'for operating variable intervention functions to be considered 12 . 13 , which are above or below the threshold value, ie do not cause a value specification, can be updated periodically, eg according to the following formula: $$\text{R '}\left(\text{n}\right)=\text{R '}\left(\text{n}\mathrm{-}\text{1}\right)+\text{W '}\left(\text{n}\right)·\text{K}\text{.}$$

where R '(n) is the evaluation measure of the current period n, R' (n-1) is the evaluation measure of the preceding period (n-1) and W (n) is the weighting factor and K is another predetermined factor for weighting the evaluation measure R '(FIG. n) is.

wobei LimTrq‘ das aktuelle Moment und N_{non_occr} die Anzahl des Nicht-Auftretens des Begrenzungswerts ist.Further, the weighting factors W (n) may be non-selected operational size engagement function 12 . 13 be updated periodically, eg according to the following formula: $$\begin{array}{ll}\text{W '}\left(\text{n}\right)=\text{W '}\left(\text{n}\mathrm{-}\text{1}\right)\hfill & -(\text{W '}\left(\text{n}\mathrm{-}\text{1}\right)·\text{f6}\left(\text{LimTrq '}\mathrm{-}\text{CurrTrq}\right)·\text{Fac5}\hfill \\ \hfill & -\text{W '}\left(\text{n}\mathrm{-}\text{1}\right)·\text{f7}\left({\text{N}}_{\text{non\_occr}}\right)·\text{Fac6}\text{.}\hfill \end{array}$$

where LimTrq 'is the current moment and N _{non_occr is} the number of non-occurrence of the bounding _value .

To perform these functions, the controller 3 Have hardware and / or software components.

With the in 3 The method shown determines which value or moment and thus which operating variable intervention function 12 . 13 - is the cause of a limitation of the value or the torque. The momentary values of each operational size intervention function 12 . 13 are compared to a provisional, selected control value to see if they are the same size. This determines which moment corresponds to the final control value. If two moments are the same size, both moments are taken into account in the further procedure. If a difference between this moment and the current moment of the drive motor 2 is less than a threshold, this moment is marked as a selected moment. Other moments above or below the threshold are marked as moments to be considered while the remaining moments are marked as non-selected moments.

This in 3 The method shown starts with a step S3000, wherein a counter i is set to one in a step S3100.

In a step S3200, it is checked if the variable n is for the number of operation amount engaging functions 12 . 13 is less than or equal to the counter i.

When the variable n is at least equal to the counter i, all the operation amount engaging functions have become 12 . 13 and the process ends with a step S3210.

If, on the other hand, the variable n is smaller than the counter i, not all the operation quantity intervention functions have yet been completed 12 . 13 and the process proceeds to a step S3300.

In step S3300 it is checked whether a current momentary limit corresponds to the manipulated variable M.

If the current torque limit is equal to the manipulated value M, the process proceeds to a step S3400.

In step S3400, it is checked whether the difference between the current torque limit and a current engine torque is smaller than a threshold value. If the difference between the current torque limit and the current engine torque is smaller than the threshold value, the process proceeds to a step S3500. That is, the current engine torque is greater than the current torque limit minus the threshold.

Since the current engine torque is based on the control value M and therefore the minimum and / or maximum limiting values M _B1 ... M _{Bn have been} taken into account in the determination of the control value M and therefore the current engine torque corresponds to a limiting value M _B1 ... M _Bn when a farm size intervention functions 12 . 13 was active.

In step S3500, the current torque limit is provided with a flag W for a selected moment. Thus, the current manipulated variable is a (provisionally) selected manipulated variable. This also becomes the respective operating size intervention function 12 . 13 assigned.

The process then proceeds to a step S3600 in which the counter i is incremented by one. Thereafter, the process proceeds to step S3200.

On the other hand, if the check in step S3300 shows that the current torque limit does not correspond to the set value M, the process proceeds to step S3310.

In step S3310, it is checked as in step S3400 if the difference between the current torque limit and a current engine torque is smaller than a threshold value. If the difference between the current torque limit and the current engine torque is smaller than the threshold value, the process proceeds to a step S3500. That is, the current torque limit minus the threshold is less than the current engine torque. If the difference between the current torque limit and the current engine torque is less than the threshold value, the process proceeds to step S3320.

In step S3320, the current manipulated variable is provided with a flag W for a torque to be taken into consideration. Thus, the current control value is a control value that does not specify the final control value M, but is taken into account in the further course of the process.

The process then proceeds to step S3600, in which the counter i is incremented by one. Thereafter, the process proceeds to step S3200.

If the difference between the current torque limit and the current engine torque determined in step S3400 is not smaller than the threshold value, the process proceeds to step S3410. That is, in this case, the current torque limit minus the threshold is not smaller but greater than the current engine torque.

In step S3410, the current torque limit is assigned a flag L for a non-selected torque limit, where the flag L indicates that this current torque limit is no longer taken into account in determining the control value M. Here is the current engine torque smaller than a minimum and / or a maximum limiting value M _B1 ... M _Bn .

The process then proceeds to step S3600 again.

The process is totaled n times in accordance with the number of operation size engagement functions 12 . 13 In each pass, an actual moment limit is determined and compared with previous maximum or minimum values to finally determine the final control value M.

In 4 are examples of three classification processes and show the course in each case of a current engine torque Actual Engine Trq, the course of a difference to the threshold Difference threshold, the course of a selected torque limit Limit Trq 1 , the course of a non-selected, but considered momentary limit Limit Trq 2 and the history of a non-selected torque limit Limit Trq 3 shown.

In 5 it is shown that the torque limits Limit Trq 1 to Lim Trq n are determined by first, as described above, the respective weighting factors W (1) to W (n) are determined by evaluating the number of occurrences of the limiting _value N _occr-con , the number of occurrences of the limiting _value N _occr , the number the occurrence of the limit _value under the same load torque N _{load_st} , the number of occurrences of the limit _value at the same rotational speed N _{eng_st} and the number of non-occurrence of the limit _value N _{non_occr} . Then, as also described above, the respective weighting R (1) to R (n) are determined and then the respective torque limit values Limit Trq 1 to Lim Trq n determined.

In 6 a flow chart of a calibration procedure is shown. If, for example, the drive motor 2 Providing power values that are substantially inconsistent with its desired power values, for example because it provides too low a torque, the weighting R, R 'can be evaluated to determine which of the operational size engagement functions 12 . 13 were active and under what conditions. So a calibration can be done.

The process starts with a step S6000.

In a step S6100 torque loss for different limits and in a step S6200 further parameters of the motor vehicle are calibrated.

In a step S6300, all motor vehicle tests are performed.

In a step S6400, the values R, R 'are checked for each limit value M _B1 ... M _Bn .

If it is determined in a step S6500 that the respective score R, R 'is not too high, the process proceeds to a step S6600.

In step S6600 it is checked whether the respective evaluation measure R, R 'is not too low. If the respective evaluation measure R, R 'is not too low, it is checked in a step S6700 if this is so intended. If so, the process ends with a step S6800.

On the other hand, if it is determined in step S6500 that the respective judgment value R, R 'is too high, the process proceeds to step S6510.

In step S6510, it is checked whether the current sizes of the values R, R 'are so intended. If so, the process continues to step S6700. On the other hand, if it is not so intended, the process proceeds to step S6520.

In step S6520, the parameters are recalibrated, to which the high score R, R 'of the respective limits can be attributed.

In a step S6530, all necessary motor vehicle tests are performed and the process proceeds to step S6400.

If it is determined in step S6600 that the respective score R, R 'is too low, the process proceeds to step S6610.

In step S6610, it is checked whether the current sizes of the evaluation mass R, R 'are so intended. If so, the procedure continues with the S6700. On the other hand, if it is not so intended, the process proceeds to a step S6620.

In step S6620, the parameters are recalibrated, to which the high score R, R 'of the respective limits can be attributed.

In a step S6630, all necessary motor vehicle tests are performed and the process proceeds to step S6400.

Will in the step 6700 when it is determined that the respective score R, R 'is not intended to be low, the process proceeds to step S6500.

Even if no torque limitation has occurred, it can be determined whether, for example, during operation at full load, the drive motor 2 operated and / or the environment was protected.

Even with damage of components, in particular with warranty cases, it can be checked whether these damages are due to high speeds or other extremely high loads.

7 shows a flowchart of a diagnostic method. Here the evaluation measures R, R 'are used to determine if components of the drive motor 2 work properly. For example, a permanent overheating of the drive motor 2 lead to a high score R, R ', which is related to a limiting function intended to prevent overheating. Thus, a connection with the cooling can be made here. In this way, components can be monitored that are in connection with a limiting function.

The method starts with a step S7000.

In a step S7100 it is checked whether the evaluation measure R, R 'in connection with components of the drive motor 2 stand.

In a step S7200 it is checked whether all the evaluation measures R, R 'are as intended. If this is not the case, the method continues with a step S7300.

In step S7300 it is checked whether the increased score R, R 'is the cause of a component malfunction or failure. If this is not the case, the method is continued with a step S7400.

In step S7400, changes are made to reduce the size of the score R, R '. In addition, the process proceeds to a step S7250, as will be explained later.

The process ends with step S7500.

If it is determined in step S7200 that not all of the evaluation measures R, R 'are as intended, the process proceeds to step S7250.

In step S7250, it is checked whether a predetermined period of time has passed since the last check. If so, the process continues with step S7100. If this is not the case, the method continues with a step S7300. Otherwise, the process proceeds to step S7200.

If it is determined in step S7300 that the increased score R, R 'is the cause of a component malfunction or failure, the process proceeds to step S7350.

In step S7350, the cause of the error is detected and eliminated.

8th shows a flowchart of a re-calibration process. With the re-calibration procedure, the life of the drive motor 2 be increased. With the aging of the drive motor 2 At the same time it changes its capacity and probably decreases. If, however, an unchanged high torque is required, this can lead to damage. However, the limiting functions of the aging can be adjusted so as to extend the life of the drive motor 2 to reach. For this purpose, an evaluation of the evaluation measures R, R 'take place.

The process starts with a step S8000.

In a step S8100, it is checked whether the total running time of the drive motor 2 exceeds a threshold value. If this is not the case, the method continues with step S8100.

If the threshold value has been exceeded, the method continues with a step S8200.

In step S8200, all the weights R, R 'are checked for each limiting function.

In a step S8300, it is checked whether all the weights R, R 'are as intended. If this is not the case, the method is continued with a step S8400.

In step S8400, it is checked whether the increased evaluation score R, R 'causes the aging of the drive motor 2 is. If this is not the case, the method is continued with a step S8500.

In step S8500, changes are made to reduce the size of the score R, R '. In addition, the process proceeds to step S8350, as will be explained later.

The process ends with step S8600.

If it is determined in step S8200 that not all the scores R, R 'are as intended, the process proceeds to step S8350.

In step S8350, it is checked whether a predetermined period of time has passed since the last check. If this is the case, the method continues with step S8200. Otherwise, the process proceeds to step S8300.

If it is determined in step S8400 that the increased evaluation score R, R 'is the cause of aging of the drive motor 2 is the process continues with a step S8450.

In step S8450, parameters are then adjusted.

Thus, it becomes possible to provide data for tuning optimization of a drive train of a motor vehicle and at the same time to considerably reduce the amount of data to be recorded and archived. With the data, for example, power deviations from a desired power of the drive motor 2 can be detected and analyzed, controlled, whether components of the drive motor 2 work properly and the life of the drive motor 2 be increased.

Claims (14)

A method of operating a motor vehicle, in which a manipulated variable (M) for driving a drive motor (2) of the motor vehicle to a default value (V) is determined by performing the following steps: - providing operating variable adjustment functions (11) which are designed to operating point dependent to specify a target value; - Providing a plurality of Betriebsgrößeneingriffsfunktionen (12, 13), each of which is adapted to operating point dependent on a minimum and / or a maximum limiting value (M _B1 ... M _Bn ) to specify; - calculating the manipulated variable (M) according to a predetermined operation amount calculation path with the operation amount adjustment functions (11) and the plurality of operation amount engagement functions (12, 13); Determining a range of allowable target values for the manipulated variable (M) by taking into account the respective minimum and / or maximum limiting values (M _B1 ... M _Bn ); wherein at a limitation of the control value (M), the relevant, the control value (M) limiting operating variable engagement function (12, 13) is determined; - Operating the motor vehicle depending on the determined Betriebsgrößeneingriffsfunktion (12, 13). Method according to Claim 1 wherein, for determining the selected operating variable engagement function (12, 13), the value of the predetermined control value (M) is compared with the respective minimum and / or maximum limiting values (M _B1 ... M _Bn ) of the plurality of operating _{variable engagement functions} (12, 13), and the selected operating variable intervention function (12, 13) is provided with a characteristic (W) for a selected operating variable intervention function (12, 13) whose assigned minimum and / or maximum limiting value (M _B1 ... M _Bn ) corresponds to the predetermined control value (M). equivalent. Method according to Claim 2 wherein a plurality of operation amount engaging functions (12, 13) are provided as selected operation amount engaging functions (12, 13) with a flag (W) for one of the selected operation amount engaging functions (12, 13), respectively, if equal to the respective plurality of selected operation amount engaging functions (12, 13) large minimum and / or maximum limiting value (M _B1 ... M _Bn ) is assigned. Method according to one of Claims 1 to 3 wherein a difference is determined from an intermediate result for an engine value and the minimum and / or maximum limit value (M _B1 ... M _Bn ) of an operation amount _{engagement function} (12, 13), and the operation amount engagement function (12, 13) with a flag (W ) for a selected operational size engagement function (12, 13) if the difference is less than a threshold. Method according to one of Claims 1 to 4 in which at least one of the selected operating variable engagement functions (12, 13) is assigned a score (R, R '). Method according to one of Claims 1 to 5 , wherein the evaluation measure (R, R ') is compared with a threshold value, and upon exceeding the threshold value by the evaluation measure (R, R'), parameters of the drive motor (2) are detected. Method according to one of Claims 1 to 6 wherein the score (R, R ') is weighted by a weighting factor (W). Method according to one of Claims 5 to 7 , wherein the evaluation measure (R, R ') is compared with a reference value, wherein when the reference value is exceeded by the evaluation measure (R, R') parameters of the motor vehicle adjusted to effect a reduction of the score (R, R '). Method according to one of Claims 5 to 8th in which the evaluation measure (R, R ') is compared with a comparison value, wherein a component malfunction or failure is assigned to the evaluation measure (R, R') of the motor vehicle if the comparison value is exceeded by the evaluation measure (R, R '). Method according to one of Claims 5 to 9 , wherein the evaluation measure (R, R ') is compared with a predetermined control value, wherein when the control value is exceeded by the evaluation measure (R, R') parameters of the motor vehicle are adapted to reduce the aging of the drive motor (2) of the motor vehicle to effect. Device in a motor vehicle (1), wherein the device is adapted to one of the methods of Claims 1 to 10 perform. Motor system (1) with a drive motor (2) and a device according to Claim 11 , Computer program adapted to perform all steps of a method according to one of Claims 1 to 10 perform. Machine-readable storage medium on which a computer program is based Claim 13 is stored.

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