KR102173922B1 - Method and device for adapting a loss torque of an internal combustion engine in a hybrid driving system - Google Patents

Abstract

The present invention relates to a method for adapting the torque loss of an internal combustion engine 2 in a hybrid drive system, wherein the adaptation of the torque loss is carried out using an adaptation variable, the method comprising:
_-Setting an operating point of the internal combustion engine 2 having a preset engine torque (M) and a preset target rotation speed (n _Soll ), and
-Closed-circuit control of the target rotational speed (n _Soll ) of the internal combustion engine 2 with the rotational speed closed-circuit control device 11, and
-Determining a permanent control deviation of the rotation speed closed loop control device 11,
-Determining the adaptation value of the adaptation variable according to the permanent control deviation of the rotation speed closed loop control device 11.

Description

Method of adapting the torque loss of an internal combustion engine in a hybrid drive system and its device {METHOD AND DEVICE FOR ADAPTING A LOSS TORQUE OF AN INTERNAL COMBUSTION ENGINE IN A HYBRID DRIVING SYSTEM}

The present invention relates to a hybrid drive system with an internal combustion engine, and in particular to a method for determining and/or adapting the loss torque of an internal combustion engine.

In particular, the torque loss of an internal combustion engine caused by friction fluctuates greatly even in internal combustion engines of the same series, and in addition, fluctuates due to wear over the service life of the engine.

In a hybrid drive system in which an electric drive motor in addition to the internal combustion engine is usually provided, accurate information of the engine torque actually output from the internal combustion engine is required for setting the load distribution and setting the total power. In order to calculate the engine torque actually output from the internal combustion engine, information on the torque loss of the internal combustion engine is required.

In order to provide the most accurate data on the actual torque loss of the internal combustion engine, there is a need for an adaptive method of verifying and correcting the corresponding data of the loss torque during operation of the internal combustion engine.

In the case of a non-hybrid drive system in which only the internal combustion engine is provided, in the case of an active idle speed closed loop control device in conventional concepts, adaptation can be provided during the idling of the internal combustion engine. In particular in this case, the integral component of the idle speed closed loop control device may be used for adaptation.

In accordance with the present invention, a method for adapting the torque loss of an internal combustion engine in a hybrid system according to claim 1, and an apparatus, an engine system, and a computer program according to the equivalent claims are provided.

Further configurations are specified in the dependent claims.

According to a first aspect, a method for adapting the torque loss of an internal combustion engine in a hybrid drive system is provided, and the adaptation of the torque loss is carried out using an adaptation variable. The method herein includes the following steps.

-Setting an operating point of an internal combustion engine having a preset engine torque and a preset target rotation speed, and

-Controlling the target rotation speed of the internal combustion engine in a closed loop with a rotation speed closed loop control device, and

-Determining a permanent control deviation of the rotation speed closed loop control device, and

-Determining the adaptation value of the adaptation variable according to the permanent control deviation of the rotation speed closed loop control device.

In addition, the preset engine torque may be set through control of an electric drive connected to the internal combustion engine.

In particular for adaptation of the torque loss, the internal combustion engine is connected with the electric drive and can be separated from further torque consuming components, so that the engine torque output from the internal combustion engine is completely consumed by the electric drive.

In the case of engine systems with only an internal combustion engine, the operating range defined for adaptation of the torque loss occurs regularly during normal operation of the engine system in the vehicle, while in hybrid drive systems the conditions of the internal combustion engine's idling operation are usually not provided. Does not. The operating states provided by the hybrid drive system are generally the electric drive mode, i.e. the pure electric drive mode in the condition that the internal combustion engine is disconnected and shut down, and the respective partial torque is supplied from the electric drive as well as the internal combustion engine. And a charging mode in which the electric actuator is driven in the generator mode and mechanical energy required for this can be supplied from the internal combustion engine. Therefore, an operating state in which the engine torque supplied from the internal combustion engine directly corresponds to the loss torque of the internal combustion engine, such as in the case of the idle mode, no longer occurs. Therefore, the adaptation of the torque loss that has been carried out in the idle mode so far cannot be carried out in the conventional manner so far.

The above-described method for adapting the torque loss of an internal combustion engine, for example, can set a plurality of operating points defined by a constant output only when the power train is open, that is, when the internal combustion engine and the electric actuator are connected. The output behaves in a manner proportional to the product of the engine torque supplied from the internal combustion engine and the number of revolutions of the internal combustion engine. If the hybrid drive system is in the charging mode in which the internal combustion engine operates the electric drive motor in the generator mode under the condition that the power train is open, the engine torque and engine rotation speed supplied from the internal combustion engine are respectively equal to each other. By varying, various operating points can be taken.

If the loss torque is suitably adapted and corresponds to the actual loss torque, if the engine power from the internal combustion engine is the same, that is, if the product of the engine torque and the number of revolutions remains unchanged, not only the variable of the engine torque supplied, but also the charging mode The corresponding variable of the target rotational speed for the rotational speed closed loop control device provided during does not cause any control deviation or noticeable control deviation of the rotational speed closed loop control device.

However, in the case of a speed closed-loop control, for example, if the control deviation is determined by means of an integral non-zero permanently, a permanent control deviation is detected stating that the supplied engine torque does not correspond to the preset engine torque. Can be. In this case, adaptation of the loss torque of the internal combustion engine used for setting the engine torque can be carried out to minimize or eliminate the control deviation occurring in this case.

One of the purposes of adjusting the operating point is to set the various operating points as a constant product of the engine torque and the number of revolutions to adapt the loss torque. Adaptation can be carried out based on the permanent control deviation of the number of revolutions closed loop control device required to set the number of revolutions. In addition, through the selection of various operating points, it is also possible to adapt the torque loss for the internal combustion engine without significant fluctuations in system behavior. In the charging mode, the same mechanical output is supplied to the electric driver operated in the generator mode, so that the upper hybrid drive open circuit control device, which presets the operation mode to be selected, does not have to consider the execution of the above adaptation method.

In addition, through the targeted execution of the operating points defined by the engine torque and the number of revolutions, a high quality of adaptation can be ensured, especially when the adaptation is carried out according to the operating range, for example in operating ranges for which sufficient data do not yet exist. I can.

According to an embodiment, the rotation speed closed loop control apparatus may include an integral component, and a permanent control deviation may be determined by an integral value of the integral component.

Besides, adaptation values can be determined at a plurality of operating points, and the plurality of operating points are selected as operating points at which the same output of the internal combustion engine is present.

The adaptation values can be assigned to associated operating points or operating ranges each consisting of a plurality of operating points.

The operating points can be selected to be located in different operating ranges, one operating range,

-If the adaptation of the torque loss has not been carried out after a predetermined period, and/or

-If the adaptation values assigned to adjacent operating ranges have a deviation in excess of the deviation threshold, and/or

-In case the adaptation frequency indicates a frequency lower than the preset frequency threshold,

It is selected as the next operating range to be selected for adaptation of the loss torque.

In addition, for each operating range, the adaptation value of the adaptation variable can be stored in the adaptation characteristic map, and the adaptation value determined for one of the operating ranges is applied to the adaptation value stored in the relevant operating range and updated. Stored in the relevant operating range.

According to a further aspect, a hybrid drive open circuit control device for adapting the loss torque of an internal combustion engine is provided, the loss torque is adapted using an adaptation variable, and the hybrid drive open circuit control device,

-Set the operating point of the internal combustion engine with a preset engine torque and a preset target rotation speed,

-Closed loop control of the target rotation speed of the internal combustion engine with the rotation speed closed loop control device,

-Determines the permanent control deviation of the rotation speed closed loop control device,

-It is formed to determine the adaptation value of the adaptation variable according to the permanent control deviation of the rotation speed closed loop control device.

According to a further aspect, a hybrid drive system is provided, the hybrid drive system

-Internal combustion engine,

-With an electric actuator,

-It includes the hybrid drive open circuit control device described above.

In particular, the internal combustion engine may be connected to the electric driver so that the supplied engine torque is consumed by the electric driver, and the hybrid drive open circuit control device, when the supplied engine torque is completely consumed by the electric driver, adaptation of the loss torque In an implementation manner, it is configured to operate the hybrid drive system.

The embodiments are described in more detail according to the accompanying drawings below.
1 is a schematic diagram of a hybrid drive system with an internal combustion engine and an electric drive.
2 is a flowchart showing a method for adapting the torque loss of an internal combustion engine in a hybrid drive system.
3 is a graph showing the selection of operating points in various operating ranges for adaptation of an internal combustion engine.

In FIG. 1, in particular, a schematic block diagram of a hybrid drive system 1 for driving a motor vehicle is shown. The hybrid drive system 1 comprises an internal combustion engine 2 connected to a first clutch 3 via an output line 5. The first clutch 3 is formed to connect the output line 5 of the internal combustion engine 2 with the electric driver 4 or to separate from this electric driver.

The output line 5 is formed in such a way that it passes through the electric driver 4. On the output side of the electric drive 4, the output line 5 is connected with a second clutch 6, by means of which the output line 5 can be connected with the power train 7, and for example ( It may be connected to drive wheels (not shown) through a transmission (not shown).

In addition, the hybrid drive system 1 includes a hybrid drive open circuit control device 10 that presets the operating modes of the hybrid drive system as well as load distribution in the hybrid drive system 1. Thus, for example, in the electric mode of operation, the drive torque transmitted to the drive wheels through the output line 5 can be supplied, wherein the electric actuator 4 is separated from the internal combustion engine 2 by the first clutch 3 and 2 It is connected to the power train 7 through the engagement of the clutch 6 or maintaining the fastened state. In this case, the electric driver 4 receives electric energy through the electric energy storage device 8. In addition, the electric driver 4 is controlled via the hybrid drive open circuit control device 10 to supply the desired drive torque.

In the hybrid operation mode set by the hybrid drive open-circuit control device 10, the drive torque is from the internal combustion engine 2 and the electric drive 4 under the condition that the first and second clutches 3 and 6 are engaged. ), and the internal combustion engine 2 and the electric driver 4 supply respective partial drive torque onto the output line 5.

In the charging mode of operation, the hybrid drive system 1 is separated from the power train 7 via an open second clutch 6 and thus from the drive wheels. However, in order to charge the electric energy storage device 8, the electric actuator 4 is operated with the engine torque M supplied through the internal combustion engine under the condition that the internal combustion engine 2 is operated and the first clutch 3 is engaged. In generator mode. Through the generator mode operation, electrical energy supplied to the electrical energy storage device 8 is generated. In this case, the output to be converted, that is to say the output supplied from the internal combustion engine 2 to the electric driver 4 via the output line 5 is preset. The output is preset via the hybrid drive open circuit controller 10, and according to the state of charge of the electrical energy storage device 8, and the efficiency in converting the mechanical output into electrical energy via the electric driver 4 Can be determined.

The hybrid drive open circuit control device 10 can control the internal combustion engine 2 through a preset engine torque M, and at the same time, in order to consume the engine torque M supplied for the generation of electric energy. The electric drive 4 can be controlled.

In addition, the hybrid drive open circuit control device 10 is an operating speed for controlling the internal combustion engine 2 so that a predetermined target rotational speed n _Soll is set in advance by the hybrid drive open circuit control device 10. It also includes a closed loop control device 11. In this way, the internal combustion engine 2 can be operated by the hybrid drive open circuit control device 10 in order to supply a preset engine torque M in a condition in which the target rotation speed n _Soll is preset. . At the same time, the electric driver 4 is operated in a generator mode so that the supplied mechanical output is converted into electric energy supplied to the electrical energy storage device 8.

The engine torque M supplied from the internal combustion engine 2 to the electric actuator 4 through the first clutch 3 is substantially the internal torque of the internal combustion engine 2 corresponding to the torque generated through combustion of the fuel, And it is determined according to the torque loss caused by friction loss and charge changing loss in the internal combustion engine 2. The deviation produces the supplied engine torque M, which supplied engine torque is supplied from the input side to the electric drive 4 via the first clutch 3.

The torque loss of the internal combustion engine 2 is generally known only inaccurately for the type of construction of the internal combustion engine, in addition, due to wear of the parts over the service life of the internal combustion engine 2, and the temperature of the internal combustion engine 2 Can be changed by Therefore, by providing a point of regularly adapting the loss torque using the adaptation method, the engine torque M supplied to the electric drive 4 can be more accurately set or preset.

For the adaptation of the loss torque, the method described in accordance with the flow chart of Fig. 2 is proposed below.

In step S1, first, it is checked whether or not there is an operating mode of the hybrid drive system 1 suitable for adaptation. As a suitable mode of operation, a charging mode of operation in which the hybrid drive system 1 is separated from the power train 7 and drive wheels via an open second clutch 6 is considered. In addition, in the charging mode of operation, the internal combustion engine 2 is normally operated, while the first clutch 3 is fixedly engaged, the engine torque M and the corresponding rotational speed n A preset engine power is supplied to the electric actuator 4 at the set determined operating point. The electric driver 4 then converts the engine power to electric energy, for example to charge the electric energy storage device 8, while completely consuming the engine power supplied. In step S1, if the first clutch 3 is engaged and the second clutch 6 is open, the corresponding mode of operation, or, for example, a charging mode of operation is confirmed (or'yes'), the method of the present invention goes to step S2. It continues. Otherwise (or'no'), it returns to step S1.

In FIG. 3, for example, graphically, the operating points B1 to B4 are shown, which are defined by the engine torque M and the number of revolutions n, resulting in the same output in the electric actuator 4. The operating points B1 to B4 are located on the hyperbolic curves H shown for the determined output. In other words, the operating points B1 to B4 specified through each of the hyperbolic curves H correspond to the operating points of the same engine power supplied from the internal combustion engine 2 to the electric actuator 4.

In order to supply engine power, it is necessary to know exactly the engine torque M supplied to the electric actuator 4. However, the engine torque M can be set only when the information of the loss torque is correct, because the internal torque is generated from the control of the internal combustion engine 2 via the hybrid drive open circuit controller 10 and the engine torque ( This is because M) is obtained as the difference between the internal torque and the loss torque.

Further, the hybrid drive open circuit control device 10 determines the load torque to be consumed by the electric driver 4 through a corresponding control of the electric driver 4 or its power electronic device. The load torque to be consumed is determined through the phase currents generated in the generator mode while being adjustable via power electronics in the electric driver.

On the other hand, in step S2, the control of the internal combustion engine 2 performed through a preset engine output for output of the engine torque M determined in the corresponding rotational speed n condition for an existing or set operating point, It is determined whether the rotation speed closed loop control device 11 is performed to detect a permanent control deviation, or to detect an absolute value of a control deviation less than a preset control deviation threshold. The permanent control deviation can be confirmed, for example, through evaluation of the integral component of the rotation speed closed loop control device 11. If the integral component is not zero, or an integral value larger than the preset integral threshold according to the absolute value is confirmed, it is necessary to perform the adaptation of the loss torque.

The torque loss is adapted when the control deviation occurs as a difference or deviation between the actual rotation speed n and the target rotation speed n _Soll . If the control deviation is positive, the actual rotational speed is too high, and as a result, the engine torque M is also greater than the load torque consumed by the electric actuator 4. As a result, it is assumed that the torque loss is too high, and the torque loss has to be correspondingly reduced by the adaptation value. Conversely, if the control deviation is negative, the actual number of revolutions is too low, and as a result, the engine torque M is also lower than the load torque consumed by the electric actuator 4. As a result, it is assumed that the torque loss is too low, and the torque loss must increase accordingly through the adaptation value.

Adaptation can be carried out according to the operating range. To this end, it is provided to use an adaptive characteristic map that integrates the operating points into the operating ranges in which the loss torque is adapted through each adaptive variable. This is shown in Fig. 3 through division into operating ranges [shown as fields A]. In other words, to operating points within one of the operating ranges A, the assigned adaptation variable is applied in order to be able to carry out a corresponding correction of the torque loss in the operating ranges. Accordingly, an individual adaptation variable is determined for each of the operating ranges A shown in FIG. 3.

If the adaptation to the operating point has been carried out according to step S2, the determined adaptation variable is stored in the adaptation characteristic map corresponding to the operating range (A).

On the other hand, in step S3, it is checked whether the adaptation method should continue unchanged. This can be done according to discontinuation criteria. For example, in the hybrid drive open circuit control device 10 an operation mode change may be provided, as a result of which the rotation speed closed loop control device 11 is deactivated. In this case, the adaptation method has to end. Additional discontinuation criteria may also be considered. In step S3, if it is confirmed that the adaptation should be stopped (or yes), it returns to step S1. Otherwise (or'no'), the method of the present application continues to step S4.

On the other hand, in step S4, for the additional operating range A, additional operating points B1 to B4, characterized in that the same engine power is supplied at that operating point, are selected. These operating points are operating points B1 to B4 located on the same hyperbolic curve H as the previously irradiated operating points B1 to B4. The new operating points B1 to B4 are preferably selected to be located in the another operating range A in order to determine accordingly the adaptation value assigned to the another operating range A.

In particular, as the relevant operating range (A), the operating range (A), which is the case in which sufficient adaptation values for the adaptation variable still do not exist, or for which the adaptation value for loss torque for a predetermined period has not been determined, is selected. do. In addition, the operating range A selected for the selection of the next operating point B1 to B4 is, for example, a significantly higher deviation (a preset deviation threshold) with respect to the adaptation values of the operating points of the adjacent operating ranges A. Larger deviations) from the adaptive feature map. Such high deviations may be due to, for example, very different adaptation frequencies (variation between adaptation frequencies greater than a preset frequency threshold) in adjacent operating ranges (A), or due to the final adaptation in the relevant operating range (A). It can also occur due to time lag.

After the new operating points (B1 to B4) are set in step S5, that is, after the internal combustion engine 2 is correspondingly operated to the new operating points (B1 to B4), the integral component of the rotational speed closed loop control device 11 The re-monitoring is performed. For the new operating points (B1 to B4), the engine torque (M) and the corresponding target rotational speed (n _Soll ) are set, and the electric actuator 4 or the power electronics connected to the electric actuator consume mechanical power. Thus, it corresponds to an operating point that is controlled so that it can be converted into electrical energy in the generator mode. This is done by returning to step S2. Similarly in step S2, if a continuous control deviation is confirmed, the adaptation value of the selected operating range A must be changed.

The adaptation variable is formed in particular to apply a multiplication and/or addition scheme to the basic loss torque preset for the relevant operating range A, as a result of which it is possible to implement the adaptation of the loss torque to be considered in the relevant operating range A. . Initially, the adaptation values assigned to the operating ranges A are stored. The adaptation value of the adaptation variable in the finally assumed operating range A may be repeatedly changed according to the sign of the integral value, for example. Alternatively, the value of the adaptation variable can be adapted correspondingly to the sign of the integral value and its absolute value as a reference for the level of the control deviation.

Claims (14)

It is a method for adapting the torque loss of the internal combustion engine 2 in the hybrid drive system, the adaptation of the torque loss is performed using an adaptation variable, and the method,
_-Setting an operating point of the internal combustion engine 2 having a preset engine torque (M) and a preset target rotation speed (n _Soll ), and
-Closed-circuit control of the target rotational speed (n _Soll ) of the internal combustion engine 2 with the rotational speed closed-circuit control device 11, and
-Determining a permanent control deviation of the rotation speed closed loop control device 11,
-An internal combustion engine loss torque adaptation method in a hybrid drive system, comprising the step of determining an adaptation value of an adaptation variable according to a permanent control deviation of the rotation speed closed loop control device (11). The method according to claim 1, wherein the preset engine torque (M) is set through driving of an electric actuator (4) connected to the internal combustion engine (2). The engine torque (M) output from the internal combustion engine (2) according to claim 2, wherein the internal combustion engine (2) is connected with an electric actuator (4) and separated from further torque consuming components to adapt the torque loss. A method of adapting the torque loss of an internal combustion engine in a hybrid drive system, which is completely consumed by the electric actuator 4. The hybrid drive system according to any one of claims 1 to 3, wherein the rotation speed closed circuit control device (11) comprises an integral component, and the permanent control deviation is determined by the integral value of the integral component. How to adapt the torque loss of an internal combustion engine. The method according to any one of claims 1 to 3, wherein the adaptation values are determined at a plurality of operating points (B1 to B4), and the plurality of operating points (B1 to B4) have the same output of the internal combustion engine (2). A method of adapting an internal combustion engine loss torque in a hybrid drive system, selected as the existing operating points. The internal combustion engine according to claim 5, wherein the adaptation values are assigned to associated operating points (B1 to B4), or to operating ranges (A) consisting of a plurality of operating points (B1 to B4) respectively. Loss torque adaptation method. The method of claim 6, wherein the operating points (B1 to B4) are selected to be located in different operating ranges (A), and one operating range (A) is
-If the adaptation of the loss torque has not been carried out after a predetermined period,
-If the adaptation values assigned to adjacent operating ranges (A) have a deviation exceeding the deviation threshold, and
-In one or more of the cases where the adaptation frequency indicates a frequency lower than the preset frequency threshold,
An internal combustion engine loss torque adaptation method in a hybrid drive system, which is selected as the next operating range (A) to be selected for adaptation of the loss torque. The method of claim 6, wherein the adaptation value of the adaptation variable is stored in the adaptation characteristic map for each operation range (A), and the adaptation value determined for one of the operation ranges (A) is the relevant operation range (A). A method of adapting the torque loss of an internal combustion engine in a hybrid drive system, wherein the adaptation value is applied to the adaptation value stored in) and the updated adaptation value is stored in the associated operating range (A). In the hybrid drive open circuit control device 10 for adapting the loss torque of the internal combustion engine 2, the loss torque is adapted using an adaptation variable, and the hybrid drive open circuit control device 10,
_-Set the operating points (B1 to B4) of the internal combustion engine 2 with a preset engine torque (M) and a preset target rotation speed (n _Soll ),
-Closed loop control of the target rotation speed (n _Soll ) of the internal combustion engine 2 with the rotation speed closed loop control device 11,
-Determines the permanent control deviation of the rotation speed closed loop control device 11,
-Hybrid drive open circuit control device 10, which is formed to determine an adaptation value of an adaptation variable according to a permanent control deviation of the rotation speed closed loop control device 11. Internal combustion engine (2),
An electric actuator (4),
A hybrid drive system (1) comprising a hybrid drive open circuit control device (10) according to claim 9. 11. The electric drive according to claim 10, wherein the internal combustion engine (2) is connected with the electric drive (4) so that the supplied engine torque (M) is consumed by the electric drive (4); The hybrid drive open circuit control device 10 is formed to operate the hybrid drive system 1 in such a way that adaptation of the loss torque is executed when the supplied engine torque M is completely consumed by the electric actuator 4. Which is a hybrid drive system (1). A computer program configured to cause a computer program stored on a recording medium to execute the method according to any one of claims 1 to 3 on a computer. An electronic storage medium storing the computer program according to claim 12. Hybrid drive open circuit control device (10) provided with an electronic storage medium according to claim 13.

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