Modelling of Auxiliary Devices for a Hardware-in-the-Loop Application
The engine torque is an important control signal. This signal is
disturbed by the devices mounted on the belt. To better be able to
estimate the torque signal, this work aims to model the auxiliary
devices' influence on the crankshaft torque. Physical models have been
developed for the air conditioning compressor, the alternator and the
power steering pump. If these models are to be used in control unit
function development and testing, they have to be fast enough to run
on a hardware-in-the-loop simulator in real time. The models have been
simplified to meet these demands.
The compressor model has a good physical basis, but the validity of
the control mechanism is uncertain. The alternator model has been
tested against a real electronic control unit in a
hardware-in-the-loop simulator, and tests show good results.
Validation against measurements is however necessary to confirm the
results. The power steering pump model also has a good physical basis,
but it is argued that a simple model relating the macro input-output
power could be more valuable for control unit function development.
Johan Olsen
2005
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