US 6,186,116 B1Granted

Method for setting torque in an internal combustion engine

AssigneeDaimlerChrysler AG

InventorsNeil Armstrong, Hans Braun, Matthias Scherer

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Abstract

A method for setting the torque in an internal combustion engine determines a set air mass and a corresponding throttle valve setting from a set torque in a control tract. An actual air mass allows the difference between a set air mass and the actual air mass to be determined by comparing a set value and the actual value. The controlling effort for setting a desired torque will be reduced. A correction value for the difference between the actual and set values of the air mass is calculated whereby an adaptation of the control tract to the difference is performed. Thereby, in the control tract, a correspondingly adapted throttle valve position will then be associated with a set torque that is to be established. A compensation of the previously determined difference between the set value and the actual value of the air mass is produced. An actual fuel mass fed to the combustion chambers can be utilized for determining the actual air mass, as can a fuel/air mass ratio of a mixture fed to the combustion chambers.

Claims17

Dependent claims

A method for setting torque of an internal combustion engine, comprising the steps of

(a) performing in a control path a correlation of a torque with an air mass and of an air mass with a throttle valve position, wherein a set air mass is determined by the control path from a set torque and, a corresponding throttle valve position is determined and set;
(b) determining an actual air mass to be delivered to the internal combustion engine for combustion;
(c) determining any difference between the set air mass and the actual air mass by a comparison of the set and actual air mass value;
(d) determining a correction value for the determined difference in step (c) using the correction value to perform an adaptation of the control path to the determined difference such that in the control path a throttle valve position is associated with a set torque to be established which compensates for the previously determined difference between the set air mass and the actual air mass, and
(e) using an actual fuel mass fed to the internal combustion engine for combustion and a fuel/air mass ratio of a mixture fed to the internal combustion engine for combustion in order to determine the actual air mass.

2 more elements

Dependencies are inferred from the claim text.