Method for estimating a combustion torque of an internal combustion engine and control unit for an internal combustion engine

Abstract

The invention discloses a method for estimating a combustion torque acting upon a crankshaft of an internal combustion engine. In one example, the method comprises acquiring an instantaneous engine speed signal, calculating a cyclic engine speed signal based on the instantaneous engine speed signal, averaging the cyclic engine speed signal, correcting the averaged cyclic engine speed signal for engine losses, and estimating the combustion torque based on the corrected averaged cyclic engine speed signal. The invention also concerns a control unit for an internal combustion engine.

Description

[0001] related application [0002] This application claims priority from European Patent Application No. 11168103.7 filed May 30, 2011, the entire content of which is hereby incorporated by reference. technical field [0003] The invention relates to a method for estimating the combustion torque of an internal combustion engine. The method may provide a simplified method of engine torque estimation. Background technique [0004] In internal combustion engines, the engine torque resulting from combustion represents important information for engine and transmission control. In particular, control of an engine aftertreatment device and control of a vehicle transmission, respectively, require accurate estimation of torque during combustion mode changes or gear shifts. Additionally, the engine torque estimate may be the basis for adjusting engine throttle position and fuel injection to the engine. [0005] According to the state of the art, combustion torque is usually measur...

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Problems solved by technology

However, when the engine torque is estimated simply from the peak-to-peak variation of the crankshaft speed, the error in the estimated engine torque may increase

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