Adaption of a stationary maximum torque of an internal combustion engine

Abstract

The invention relates to a method for operating an internal combustion engine for which a stationary maximum torque and a dynamic maximum torque are determined. The determined stationary maximum torque is a stationary output maximum torque, modified to a stationary result maximum torque by being adapted in such a manner that it is greater than or equal to the determined dynamic maximum torque. The invention also relates to a corresponding internal combustion engine and to a hybrid drive device.

Description

technical field [0001] The invention relates to a method for operating an internal combustion engine, for which a steady-state maximum torque and a dynamic maximum torque are ascertained. Furthermore, the invention relates to a corresponding device. Background technique [0002] The determination of the steady-state maximum torque and the dynamic maximum torque of an internal combustion engine is known. The steady-state maximum torque is largely dependent on the current engine speed and the maximum possible charge of air or air-fuel mixture in the combustion chamber of the internal combustion engine at this engine speed. Since in many operating states of the internal combustion engine there is no maximum charge and must only be built up when required, the actual torque produced rises to the steady-state maximum torque with a certain delay, which is especially dependent on the air or mixture supply Gas path power (Luftpfad-dynamik) and / or turbocharged power from a turbochar...

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Problems solved by technology

Imprecision arises from this, since all the complexities of the gas path dynamics cannot be considered in the estimation

The physical input variables necessary for this cannot be measured for cost reasons or cannot be determined exactly due to sensor inaccuracies

The determined steady-state maximum torque may thus have inaccuracies

If the internal combustion engine is operated at full load, where the current charge corresponds to the maximum charge, the determined steady-state maximum torque may deviate from the determined dynamic maximum torque due to inaccuracies

The controller, especially for hybrid vehicles, uses steady-state and dynamic maximum torques as input parameters, thereby obtaining partially unreliable and contradictory data, which prevents optimal control

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