Mathematics in Industrial Problems pp 1-11 | Cite as

# Mass flow sensing with heat waves

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## Abstract

Catalytic converters cannot reduce the pollutants in exhaust to the required concentration if the engine’s air-to-fuel ratio is too rich or too lean. It is therefore necessary to control automobile engines to run at the *stoichiometric point*; that is, the air-to-fuel ratio at which all the fuel can be burnt, leaving no oxygen at the end of the process. The control of the air-to-fuel ratio depends on two sensors: (i) an exhaust oxygen sensor which samples the exhaust gas, and (ii) a mass flow sensor which measures the mass flow of air that enters the engine. Sensor (i) was described and analyzed by Baker and Verbrugge [1]; see also [2; Chap. 21]. Here we concentrate on mass flow sensors.

## Keywords

Heat Wave Heat Pulse Flow Sensor Slug Flow Taylor Dispersion## Preview

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## References

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