Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2000-02-22
2001-12-04
Wolfe, Willis R. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C123S339200
Reexamination Certificate
active
06327531
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method of and a device for data determination of a model for determination of characteristic variables of an internal combustion engine, in particular an internal combustion engine with direct injection or suction pipe injection.
The non published patent application DE 197 45 682 discloses a method of and a device for determination of characteristic variables, which are a part of a model for controlling a drive unit, and depending on the type of the drive unit, can be different. There first, by automatic processing of a predetermined measuring program, measuring data are determined for at least one operational variable of the drive unit for different operation points of the drive unit. Then, in a second step the characteristic variables are measured by optimization of the deviation, and the operational variable is determined on the basis of the calculated value of the characteristic variables.
SUMMARY OF THE INVENTION
Accordingly, it is an object of present invention to provide a method of the above mentioned general type which is improved in that, with lowest possible measuring expenses, a model of an internal combustion engine can be exactly provided with data, for obtaining optimal characteristic variables for controlling an internal combustion engine.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated, in a method of data determination of a model for determination of characteristic variables for controlling an internal combustion engine in which for each predetermined operation point of the internal combustion engine, at least one local model, in particular of low order, is provided with data.
An especially great advantage of the present invention is that the data determination of a local model of an internal combustion engine is possible with a minimum expense for the measurements. This stands in contrast to the expensive screen measurement.
The data determination of a model means in this connection that the model coefficients or model parameters are determined so that the deviation between the real internal combustion engine and the model of the internal combustion engine is minimal. A local model means that the model is provided with data only for a predetermined operation point of the internal combustion engine and only for this predetermined operation point of the internal combustion it is valid.
For example, for data determination of a model of an internal combustion engine by means of a screening process, when only one operational variable and three actuation variable of the internal combustion engine are considered and when the actuation variable are varied only in three steps, 3
3
=27 measurements are needed. With a local model of second order, to the contrary, only 10 measurements are needed in order to completely determine or provide the model with data.
With increased number of actuation variable and operational variables, the advantage of a local modeling is more pronounced. When for example five actuation variable and one operational variable of the internal combustion engine are considered in a model and when the five actuation variable for providing data of the model are changed in five steps, then 5
5
=3125 measurements must be performed. In contrast, for example with a local model of second order with alternating action of a first order, only 26 measurements are needed to provide data or to determine the model. In order to prevent a model error or to compensate the measuring error better, in practice more than 26 measurements are performed.
A further advantage of the present invention is that with the use of local models of low order, a simple and clear mathematical model of the internal combustion engine is provided.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
REFERENCES:
patent: 5269271 (1993-12-01), Kawai et al.
patent: 5651341 (1997-07-01), Harada et al.
patent: 5938716 (1999-08-01), Shutty et al.
patent: 6076030 (2000-06-01), Rowe
patent: 6076037 (2000-06-01), Ono et al.
patent: 197 45 682 A1 (1999-04-01), None
Huynh Henri
Philipp Matthias
Sobottka Christian
Robert & Bosch GmbH
Striker Michael J.
Wolfe Willis R.
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