CUED Publications database

On the time delay in continuous in-cylinder sampling from IC engines

Cheng, WK and Galliot, F and Collings, N (1989) On the time delay in continuous in-cylinder sampling from IC engines. SAE Technical Papers.

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Abstract

When gas sample is continuously drawn from the cylinder of an internal combustion engine, the sample that appears at the end of the sampling system corresponds to the in-cylinder content sometime ago because of the finite transit time which is a function of the cylinder pressure history. This variable delay causes a dispersion of the sample signal and makes the interpretation of the signal difficult An unsteady flow analysis of a typical sampling system was carried out for selected engine loads and speeds. For typical engine operation, a window in which the delay is approximately constant may be found. This window gets smaller with increase in engine speed, with decrease in load, and with the increase in exit pressure of the sampling system.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:02
Last Modified: 08 Dec 2014 02:19
DOI: 10.4271/890579