Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-09-25
1998-02-03
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123486, 123674, 180197, 364424088, 364431052, F02D 4114, F02D 4126, F02D 4304
Patent
active
057133328
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for controlling processes in a motor vehicle.
BACKGROUND INFORMATION
A method for controlling processes in a motor vehicle is shown in German Patent Application No. 34 08 215. The methods described therefrom are intended particularly for controlling the A/F control, knock control, ignition point control, injection control, boost pressure control or even idle control.
In the method of the German Patent Application described above, a precontrol of the operating quantities to be controlled is effected using an engine characteristics map stored in the memory of the control unit. The map is represented by a number of support points present in the memory. Using a superimposed controlling means, the deviation of the map value read out for a working point to an optimal setpoint value is determined. The map is adapted based on the determined deviations. For this purpose, a region around the support point is defined per support point as the pull-in region of the support point. As long as the working point stays in a pull-in region of a support point, for each map access the deviation of the determined map value at the position of the working point from a specified desired function curve is determined. The determined deviations are averaged. After the working point has left the pull-in region of the support point, the support point of the pull-in region is corrected by the averaged correction value.
The disadvantage of the method as described in the above German Patent Application, there is that after the adaptation of the map, the adapted support point generally does not lie on the curve of the setpoint function curve. An exact adaptation of the support points to the setpoint function curve is therefore usually not possible in one step. Moreover, the precontrol maps described in the above German Patent Application are realized without exception as grid maps. In grid maps, the support points are positioned on the specified node points of a fixed grid dividing the input space of the map. A map adaptation cannot be performed such that the support point density is locally adaptable. With coarse quantization, the maximum map dynamic response is limited; with fine quantization, it is not possible to adapt all support points sufficiently often in seldomly approached regions under certain circumstances, and knowledge gaps arise.
SUMMARY OF THE INVENTION
The method according to the present invention having the distinguishing features of the main claim has the advantage that the map structure can be adapted very precisely to the setpoint function curve. Namely, not only the deviation to the setpoint function curve is determined, but additionally the position of the determined correction value is taken into account. Moreover, the determined correction value is assigned not only to one support point, but the determined correction value is distributed over several support points adjacent to the correction value. In this manner, the map is adapted equally and immediately in a larger region to the setpoint function curve. During later interpolation of the map value on the position of the correction value, the previously computed correction value is determined exactly. Due to the fact that the map is not designed as a grid map, it is possible in particular to enter a correction at the site of its arisal. Moreover, it is advantageous that with the method according to the present invention, a fast, detailed and reliable map adaptation of even multidimensional maps is possible. In the method according to the present invention, the problem of the oscillatory inclination (tendency to oscillate), as can arise in the map adaptation of grid maps, is also avoided.
Using the method according to the present invention, it is also advantageous that in the map adaptation through changing existing support points those support points are corrected that would be used also for interpolation of a map value at the position of the correction value. In this manner, it becomes possib
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Adler Walter
Schmitt Manfred
Tolle Henning
Ullrich Thorsten
Argenbright Tony M.
Robert & Bosch GmbH
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