KR20020072550A - Method and device for controlling the drive unit of a vehicle - Google Patents

Abstract

The present invention relates to a method and apparatus for controlling a drive unit of a motor vehicle. At least one adjustment value of the drive unit is set according to the target value for the output value of the drive unit and the target adjustment time, and the target value for the output value must be realized within the target adjustment time.

Description

Method and device for controlling the drive unit of a vehicle

In modern vehicle control, a number of partially opposing settings act on the regulating elements (eg drive units, transmissions, etc.). In a drive unit of a motor vehicle, for example, on the basis of a driving request preset by the driver, for example, a drive slip adjustment unit, a motor tractor moment adjustment unit, a transmission control unit, a speed limit unit and / or a speed limit unit and / or idling rotation The target value must be controlled by an external and / or internal adjustment function and a control function such as a male regulator. Since the drive unit can only set target value presetting, the target presetting exhibits a partially opposite action, so that the target value presetting must be integrated, i.e., the target value presetting to be realized must be selected or determined. do.

As regards the control of the drive unit, in DE 197 39 567 A1, such coordination of various target moment values is known. The publication suggests that by selecting a maximum value and / or a minimum value from the moment target value, a target value for the adjustment path of the drive unit is selected, the target value being determined for the individual control parameters of the drive unit, This is for example realized by measuring the value of the filling, ignition angle and / or amount of fuel to be injected of the internal combustion engine. The boundary conditions of the target value setting are not taken into account.

The present invention relates to a vehicle drive unit control method and apparatus.

1 is a schematic diagram of a control device for control of a drive unit;

2 illustrates a preferred embodiment of the target value / adjustment time-interface.

5 shows a time graph of the manner of operation of the interface.

3, 4 and 6 to 9 show preferred embodiments of coordination of target values / adjustment time-requests.

10 shows a time graph of how target values / adjustment time-presetting and coordination work.

Figure 11 shows a second preferred embodiment of the target value / adjustment time-interface.

The definition of the requirements of the drive unit, which is a target output value / regulation time-value pair, is independent of the regulation path associated with the engine in the coordination of the various requirements. Thus, the interface definition, which is a target output / adjustable time-value pair, is suitable for all types of drives, regardless of the specific way of the drive. Engine-related coordination may be used without change when there are various types of driving devices such as auto engines, diesel engines, electronic drive devices, and the like.

It is particularly desirable that the expansion of the system, ie, attaching another target output value / adjustment time-value pair, is achieved in a simple manner without structural changes.

The specific realization of the request (target output value and regulation time) is made on the appropriate regulation path of the drive unit in accordance with the actual operating point. By means of the operating point of the adjustment time for each target value, the engine-related part of the control proceeds separately from the engine-independent part.

Through definition of the interfaces mentioned, which can be physically interpreted and abstract, the overall structure of the engine control can be outlined.

The introduction of the target value / adjustment time interface separates the components that are not associated with the engine and components associated with the engine, resulting in another degree of freedom, which is related to the translation of the requirements of the engine related portion of the engine control. The possibility for realizing this requirement is extended through various control paths and additional optimal potential is generated.

Another additional degree of freedom is obtained from the presetting of a continuously varying adjustment time with respect to the target value, so that accurate presetting and conversion of the operation in the drive unit is possible.

Still other advantages are presented in the following detailed description of the examples or in the dependent claims.

The invention is explained in more detail below by the examples shown in the drawings.

1 shows a block diagram of a control device for the control of a drive unit, in particular an internal combustion engine. A control unit 10 is provided, which comprises an input circuit 14 which is a component, at least one computer unit 16 and an output circuit 18. The communication system 20 connects the components for mutual data exchange. The input circuits 14 to 26 of the control unit 10 are provided with input lines 22 to 26, which are realized as bus systems in a preferred embodiment, and through the input lines a signal to the control unit 10. Is transmitted and the signal represents an operating value to be evaluated to control the drive unit. The signal is detected by measuring devices 28 to 32. The above operating values are accelerator pedal position, engine speed, engine load, exhaust gas composition, engine temperature and the like. By means of the output circuit 18 the control unit 10 controls the output of the drive unit. This is illustrated by the output lines 34, 36, 38 in FIG. 1, in order to set the amount of fuel to be injected, the ignition angle and / or the air supply to the internal combustion engine, an electrically actuated throttle valve is connected to the output line. Works through. By means of the adjustment path shown, the air supply to the internal combustion engine, the ignition angle of the individual cylinders, the amount of fuel to be injected, the injection timing and / or the air-fuel ratio, and the like are set. In addition to the input values shown, there is another control system of the motor vehicle, which transmits a preset value, for example a rotation moment target value, to the input circuit 14. The control system is, for example, a drive slip adjustment unit, a driving dynamics adjustment unit, a transmission control unit, a motor tractor moment adjustment unit, and the like. In addition to the illustrated target value presetting and / or external target value presetting belonging to the target value presetting and / or the speed limiter in the form of driving demands by the driver, there are internal target values for controlling the drive unit, for example, the rotation moment of the idle control part. It is a separate target presetting value at start-up and / or limited by rotational speed limiter, rotational moment limiter and / or part protection which outputs a corresponding target presetting value.

Boundary conditions or characteristics representing the method and method of converting target value presettings are associated with individual target value presettings. In this case, one or more characteristics may be connected to the target value presetting value according to the use example. It is shown that the actual information is the adjustment time, in which the target value presetting is set. In addition, another characteristic of the target value presetting, for example, its priority may be transmitted. There is a time interval under the adjustment time, and the target value should be adjusted at least within the time interval. Between the actual (starting) value and the target value (end value) within the adjustment time, the curve of the actual value affected by the target value can be freely determined according to the selected target. The curve can thus be tailored to the engine and optimized according to at least one optimization criterion (eg minimum fuel consumption). The actual value must be reached at the end of the adjustment time at the end of the adjustment time.

The described presetting of the regulation values and regulation times, which are value pairs, is used not only in connection with internal combustion engines, such as auto engines or diesel engines, with suction pipe injection or direct injection, but also with other driving concepts such as electronic engines, for example. .

As the preset value (target value), the rotation moment of the drive unit of the preferred embodiment is given. In another use example, an output value, a rotation speed, and the like and other output values of the drive unit may also be provided as preset values.

Figure 2 shows a flow diagram illustrating the conversion of the above-mentioned interface and preset value pairs of adjustment values in the example of a simple embodiment. The control unit 10 actually comprises a coordinator 100 and a transducer 102. For example, in addition to the above-not shown input values mentioned above, for example, target moments MSOLL1 or MSOLL2 and corresponding adjustment times TSOLL1 and TSOLL2, respectively, from external control systems such as drive slip adjustment 104 and driver 106, respectively. It is transmitted as this input preset value, and the preset target moment is set within the adjustment time. The preset value pair is transmitted to the coordinator 100. In the coordinator, according to one of the following methods, the resultant preset pairs MSOLLRES and TSOLLRES are selected in some cases under consideration of another preset pair. The value pair is sent to a transducer 102. The transducer 102 is provided with air supply, ignition and / or under consideration of the actual operating state of the drive unit, which is based on operating values such as engine speed, engine load, actual moment, etc. (compared to the symbolic lines 108 to 110). An adjustment value is formed to control fuel injection. In this preferred embodiment, a table is provided for selecting each adjustment path, in which the respective minimum adjustment time of the individual adjustment paths for the measured rotation moment change is indicated, depending on the actual operating state of the drive unit. . Depending on the pre-set target adjustment time and the change in rotation moment provided, the adjustment path is selected in proportion to the preset method (eg consumption optimization), and the rotation moment can be changed within the target adjustment time via the adjustment path. If it is not possible to change the rotational moment alone through one path, it is ensured that the target moment is realized within the preset adjustment time.

In another embodiment, another coordinator is provided between the coordinator 100 and the transducer 102, wherein the resulting value of the coordinator 100 in relation to the engine-independent values in the coordinator is the target value / adjustment time associated with the engine. It is integrated with -value pairs (rotation moment limit, rotation limit, etc.). The output signal is the resulting target moment / adjustment time-value pair, which is transmitted to the transducer 102 and converted into individual adjustment values in accordance with the above-described figure.

FIG. 5 shows a time graph, which shows the curve of the rotation moment of the drive unit at various points in time when the target moment value and the target adjustment time change. FIG. 5A shows a temporal graph of the target moment presetting, while FIG. 5E shows the adjustment time, while the curves of the actual moment M are shown in FIGS. 5B-5D. The curve of the target moment presetting is shown in FIG. 5A, where the target moment increases from time T0 to time point T0 + T and then remains constant until time point T0 + 2T. The adjustment time is kept constant between the time points T0 and T0 + T, while the time until the time point T0 + 2T is reduced. Correspondingly, the expected moment curve is shown and the curve is shown as time point T0 in FIG. 5B and as time point TO + T in FIG. 5C. Since the target adjustment time is constant and the target moment value is increased, the expected moment curve is adjusted accordingly. At the time point T0 + 2T, the target moment value remains constant and the adjustment time is significantly reduced, resulting in a substantially faster moment change. In practice, the adjustment time changes continuously and is adjusted at each time point (e.g., the adjustment time becomes smaller so that the moment is set according to the original adjustment time if the conditions do not change and the moments are the same).

In order to integrate the value pairs in the coordinator provided to the coordinator 100 or the engine control unit, various methods are appropriately presented and the methods are the minimum coordination, maximum coordination, summing coordination, subtractive coordination, maximum coordination for adjustment time and / or adjustment. Minimum coordination for time.

An example of minimum coordination is shown in the flowchart of FIG. 3. It consists of comparing the values of the target moment and selecting the smallest value as the resulting target moment. The resulting adjustment time is the adjustment time assigned to the moment. In the case of the coordination method, the number of value pairs to be integrated is not limited. In addition to the adjustment time, other and other information can be similarly selected, for example in a corresponding manner, for example the priority assigned to the individual operation.

3 shows a flowchart of the minimum coordination in the coordinator 100. When the target moments MSOLL1 and MSOLL2 are transmitted, the value is guided on the comparator 150. The comparator detects which of the two target values is the smallest. As a result, the comparator 150 actuates the switching element 152 or 154 via its output signal and the smallest moment target value is output through the element as the resultant target moment. In addition, the adjustment time TSOLL1 and TSOLL2 are transmitted to the coordinator 100 and the comparator 150 connects the switching element 152 such that the adjustment time allocated to each minimum moment is output as the resultant adjustment time TRES. do.

4 shows a flow chart for maximum coordination. In the case of maximum coordination, the values of the target moments are likewise compared, of course the largest value is selected rather than the smallest value of the target moment. The resulting adjustment time is in this case the adjustment time assigned to the largest moment. Similar to the minimum coordination, the coordinator 100 for maximum coordination includes a comparator 160, target moments MSOLL1, MSOLL2 are transmitted to the comparator and the comparator via its output signal switching elements 162, 164 ). The comparator 160 detects the largest moment of the transmitted moments and correspondingly connects the switching elements 162 and 164. This is done via switching element 162 such that the largest moment value is selected as the resulting target moment value MSOLLRES and the adjustment time assigned to the largest moment value is selected as the resulting adjustment time TSOLLRES.

Minimal coordination is used in particular for reduced momentary operation, for transmission switching operation and for drive slip adjustment operation, while the maximum selection is used for increased moments, for example the operation of the motor tractor moment control.

It is suggested that the minimum and maximum coordination is not sufficient to cover all possible use cases. In the connection of an additional device, for example an air conditioner, the drive unit generates additional rotation moments with a relatively short adjustment time. If the rotation moment coincides with an increase in the target moment, an adverse moment curve occurs in the case of minimum or maximum coordinates. Thus, it is provided that the adjustment time and the target moment are combined with each other rather than being integrated independently of each other. The coordination method is shown in the time graph of FIG. 6, which adds a target moment value. In the case of the so-called summation coordination of the target moment / adjustment time-value pair, the smallest adjustment time is first detected. Through interpolation, a target moment calculated by interpolation for at least one further target moment / adjustment time-value pair is detected for the adjustment time. The resulting target moment is the sum of the target moments calculated by interpolation in some cases for the smallest adjustment time. The resulting adjustment time is the smallest adjustment time. As the interpolation function, a first-order, exponential, forging or non-forging function is provided depending on the use example. Interpolation is based on actual moments or other moments such as, for example, the last target moment. In addition to the adjustment time, other information may also be selected, for example priority.

FIG. 6 shows the moment M with respect to time, representing the coordination origin of the actual time point T0 and the actual moment MIST that is actually present. The resulting adjustment time for setting the target moment is the smallest adjustment time of the transmitted adjustment times TSOLLRES, namely (T1). In the illustrated embodiment, two target moments, that is, MSOLL2 to which adjustment time T2 is assigned and MSOLL1 to which adjustment time T1 is assigned, must be integrated. When the adjustment time is shortest, not only the target moment MSOLL1 but also the target moment MSOLL2 is realized, when the target moment value MSOLL2 is realized, the moment value MSOLL2 'reached at the time point T1 is the above embodiment. It is calculated based on the interpolation line (broken line) provided in. The moment value is added to the target moment value MSOLL1 to be reached at the time point T1, whereby the target moment value MSOLLRES is formed through the sum of the two values. The target moment value MSOLLRES is realized within the time point T1, and not only the target moment value MSOLL1 assigned to the smallest adjustment time, but also the value MSOLL2 assigned to another adjustment time is taken into account.

Correspondingly, a coordination of subtractions is provided and the coordination is used in blocking by the consumer and likewise the value pair transmitted is detected for the smallest adjustment time. Through interpolation for at least one further value pair, a target moment taken at that point in time and detected through interpolation is determined. The resulting target moment is the difference of the interpolated target moments of the smallest adjustment time corresponding to the presented connection. The resulting adjustment time is the smallest adjustment time. Interpolation and consideration, and in some cases further information, is done similar to the coordination of summation.

FIG. 7 shows a curve of rotational moments over time, similar to FIG. 6. Here again there is an adjustment time T1. The target moment to be realized with the adjustment time is (MSOll1). For the value pairs MSOLL2, T2, the interpolated target moment at time point T1 is subtracted from MSOll1, resulting in the resulting target moment MSOLLRES and the moment being set last within the adjustment time T1. .

Another possibility for concatenation of value pairs is the maximum or minimum selection for adjustment time. The selection represents an alternative to the coordination according to FIGS. 3 and 4, where the smallest adjustment time of the transmitted target moment / adjustment time-value pair is selected by default, whereas in the method of FIGS. 3 and 4 it is assigned to the selected moment. It is distinguished that the adjustment time is always selected. Therefore, the mechanical ratio is better considered. Through interpolation, the target moment interpolated for the remaining value pairs during the adjustment time is detected as mentioned above. The resulting target moment is the smallest value (minimum) or the largest value (maximum) of the target moment at the time of the smallest adjustment time. The resulting adjustment time is the smallest adjustment time. Interpolation is also carried out here, and additional information corresponding to the above is considered.

The coordination method is illustrated by the time graphs of FIGS. 8 and 9. In the graphs, the rotation moments versus time are respectively shown. Each adjustment time is (T1), which is the smallest value of the adjustment time provided. According to FIG. 8, the target moment MSOLL1 belonging to the adjustment time T1 and the target moment MSOLL2 belonging to the adjustment time T2 are shown. From the value pairs MSOLL2 / T2, a target moment is calculated by interpolation at time T2 and the target moment is connected to the target moment MSOLL1 when selecting the maximum value. In the illustrated embodiment, since the value is smaller than the value MSOll1, the resulting target moment value MSOLLRES is the value MSOLL1. The target value MSOll1 is realized within the time T1. In Fig. 9 the corresponding scheme is shown as the minimum selection. This figure also has the shortest adjustment time T1. The adjustment time MSOLL1 is assigned to the adjustment time. The other value pair forms (MSOLL2, T2). Interpolation results from the pair of values and from the target moment value smaller than the target value MSOLL1 at the time point T1. By minimum selection, the interpolated target value as the resulting target value MSOLLRES is output and set in the adjustment time TSOLLRES.

The manner of operation of the above-described presetting of the target moment / adjustment time-value pair and its coordination is shown in FIG. 10 by the operating situation preferably selected under the use of minimal coordination. 10A shows the temporal curve of the actual moment of the drive unit, FIG. 10B shows the temporal curve of the target moment, and FIG. 10C shows the temporal curve of the target adjustment time. The driver's needs are a priority. The driver presets the target moment value MSOLL, which is assigned an adjustment time TSOLL and is realized by corresponding moment increase according to FIG. 10A. At time T1, the drive slip regulator is activated. The smaller target moment is suddenly preset at time T1 due to the smaller target moment, and, in accordance with FIG. 10C, due to the dynamics of the required operation, a substantially smaller adjustment time is allocated (time T1). The actual moment is therefore reduced to the target moment very quickly from the time point T1. Since the target moment remains unchanged until the time point T2, the moment change no longer occurs when the adjustment time no longer changes. At the time point T2, the drive slip adjuster is terminated, and the target moment is placed again on the driver's request (the target moment of the adjuster is greater than the target moment of the driver's request). The resulting moment is assigned a larger adjustment time. Depending on the actual operating state at the time point T2 set according to the selected adjustment path between the time intervals T1 and T2, the slow change in the moment curve taking into account the large adjustment time, or preferentially very fast up to the time point T2. A change is obtained and this rapid change translates into a slower change (compare FIG. 10A). This happens, for example, for long-stop ASR-operation (driving on snow), because in this case the air filling path is continuously reduced and in some cases a more rapid increase due to insufficient reserve for the ignition angle. This can't be done. Also in the case of existing reserves, further operating conditions and requirements (eg comfort, catalytic converter heating, component protection) are very important in determining the rapid or slow increase.

Claims (9)

A method for controlling a drive unit of a vehicle, wherein at least one adjustment value of the drive unit is set according to a preset value for an output value of the drive unit, The adjustment time value is preset along with the preset value, and a preset value must be set within the adjustment time value. 2. The method of claim 1, wherein a target value and an adjustment time resulting from a plurality of pairs of values of the target value and the target adjustment time are selected, wherein the adjustment time is based on the setting of the adjustment value. 3. A method according to any one of the preceding claims, wherein the smallest target value and corresponding adjustment time are selected as the resulting value pair. 4. A method according to any one of claims 1 to 3, wherein the largest target value and the adjustment time assigned to the target value are selected as the resulting value pair. 5. The time point of the adjustment time according to any one of claims 1 to 4, wherein the resulting value pair is based on a smallest adjustment time and a target value of at least one other value pair and a target value assigned to the adjustment time. And a sum with a target value interpolated over time. 6. The method according to any one of claims 1 to 5, wherein the smallest adjustment time is formed as a result of the adjustment time, and the target value assigned to the smallest adjustment time and at least one other value pair as the resulting goal value. And a target value formed at the time of the adjustment time is formed from the target value formed on the basis. 7. The method according to any one of claims 1 to 6, wherein the smallest adjustment time is formed as the resulting adjustment time, and the smallest or largest target value is formed at the time of the smallest adjustment time as the resultant target value. How to feature. 8. A method according to any one of the preceding claims, wherein the adjustment time can be preset to vary continuously. An automobile drive unit control apparatus having a control unit for setting at least one adjustment value of a drive unit in accordance with a preset value for an output value of a drive unit, Means are provided for setting the adjustment value, wherein the means obtains a target value and a target adjustment time for an output value as a preset value, and the target value is set within the target adjustment time.