US 4,901,240 AGranted

Method and apparatus for controlling the operating characteristic quantities of an internal combustion engine

AssigneeRobert Bosch GmbH

InventorsPeter J. Schmidt, Manfred Schmitt

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Abstract

In a method and an apparatus for open-loop and closed-loop control of operating characteristic quantities of an internal combustion engine, it is proposed that the anticipatory or pilot control area, which is variable by means of learning, be embodied such that in a factor characteristic field associated with a basic characteristic field, not only the particular support point but with decreasing influence outward the area surrounding it as well are changed by the carry-over of an averaged regulating factor value. Alternatively, or preferably combined therewith, the factor characteristic field is replaced by at least two correcting characteristic fields, which have larger inclusion areas, overlapping one another, for each support point, so that even in the event of fluctuations of input quantities about a border of an area, at least one of the correcting characteristic fields will be addressed.

Claims8

Dependent claims

Method for controlling operating characteristic quantities of an internal combustion engine by calculating values for an anticipatory control for metering fuel, the method including a characteristic field having values of engine operating quantities stored therein for anticipatorily controlling engine variables influencing the operating characteristic quantities, the engine including a regulator for forming a control factor RF, the method comprising the steps of:

correctively influencing the particular emitted characteristic field values with a control device sensitive to at least one engine variable as an actual value;
changing values stored in the characteristic field via said control device for correcting the characteristic field values, the stored values being addressed in dependence upon operating quantities of the engine such as speed and load;
averaging the control factor RF to form an averaged control factor RF;
with a factor characteristic field associated with the basic characteristic field and whose area factors multiplicatively operate on data emitted from the basic characteristic field and with adaptive take over from the averaged control factor RF, also selectively changing, for a predetermined factor area defining a support point having a support point factor, the area surrounding this support point outwardly;
said factor characteristic field having a plurality of support points and, with adaption of one of said support points, the change of the area surrounding said support point takes in an inner ring of the other support points directly adjoining said area and at least one further outer ring of the other support points surrounding said inner ring of support points;
and, with the support points directly affected, the support points of the inner ring all being changed with respective different weighting;
forming quantities for metering fuel to the engine from the following:
said characteristic field values of said basic characteristic field, the values of said factor characteristic field and said control factor RF;
and,
controlling a device for metering fuel to the engine which meters fuel to the engine in correspondence to the value of one of said quantities.

7 more elements

correctively influencing the particular emitted characteristic field values with a control device sensitive to at least one engine variable as an actual value;
changing values stored in the characteristic field via said control device for correcting the characteristic field values, the stored values being addressed in dependence upon operating quantities of the engine such as speed and load;
storing several smaller factor corrective characteristic fields I and II to prevent omitted adaptation when passing over area boundaries of input operating quantities, said factor corrective characteristic fields I and II having larger inclusion areas with reference to a particular support point of the factor characteristic field;
and, with these inclusion areas overlapping each other in such a way that with small fluctuations of the input quantities, addressing at least one of the corrective characteristic fields via a separate mean value formation of the control factor RF to form an averaged control factor RF;
forming quantities for metering fuel to the engine from the following:
said characteristic field values of said basic characteristic field, the values of said factor characteristic field and said control factor RF;
and,
controlling a device for metering fuel to the engine which meters fuel to the engine in correspondence to the value of one of said quantities.

5 more elements

Dependencies are inferred from the claim text.