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Abstract |
An Ion-Sense Engine-Fine-Tuner
IEEE Control Systems: Special Issue on Powertrain Control, October 1998 Combustion engines are highly engineered complex system. Many
variables like engine speed and load are measured, but there are many
other variables influencing engine performance that are not measured.
One such variable that strongly influences efficiency and power is air
humidity. Even with such varying unmeasured variables, it is well
known that a skilled human mechanic can diagnose and fine tune a car
according to the environment and circumstances at a certain place and
day. Inspired by these skills in combination with the development of
computing power, it is possible to think of virtual engine-doctors and
virtual engine-fine-tuners. Here an ion-sense engine-fine-tuner has
been developed based on spark advance feed-back control using
ionization current interpretation. It is shown, as a main result,
that it can control the engine back to its optimal operation even when
subjected to humidity in the intake air.
Lars Nielsen and Lars Eriksson
IEEE Control Systems, 1998
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