Engine Speed Based Estimation of the Indicated Engine Torque
The aim of this master s thesis is to implement and evaluate a method
for estimating the indicated engine torque. The method is developed by
IAV GmbH, Fraunhofer-Institut and Audi AG. The determination of the
indicated torque is based on high resolution engine speed
measurements. The engine speed is measured with a hall sensor, which
receives the signal from the transmitterwheel mounted on the
crankshaft. A transmitterwheel compensation is done to compensate for
the partition defects that arises in the production and thus enable a
more precise calculation of the angular velocity. The crankshaft
angle, angular velocity and angular acceleration are estimated and the
help variable effective torque is calculated using these signals as
input. Through a relationship between effective torque and the
indicated pressure the indicated pressure is extracted from a map. The
indicated torque is then calculated from the pressure. The method is
validated with data from an engine test bed. Because of the low
obtainable sample rate at the test bed, 4MHz, quantisation errors
arises at engine speeds over 1000 rpm. Therefore the model is
validated for low engine speeds and the result is promising.
Magnus Hellström
2005
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