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Development of Automatic Control System and Diagnostic System for a Mini- Tunnel
Published June 01, 1992 by ISATA - Dusseldorf Trade Fair in United Kingdom
Event: ISATA 1992
A report on the Mini-Tunnel of Twin-Orifice Type has already been presented at the JSAE and the ISATA in 1990. This paper describes the development of some new devices to enable using Fractional Sampling Dilution Tunnel so called the Mini-Tunnel in engine development. These devices include an Automatic Orifice Changing Device (AOCD) able to be set in a short time according to engine swept volume, and Pressure Control Device (PCD) which maintains the Split Ratio (SR) constant.
In particular, to maintain the measuring accuracy of Particulates, a Pre- Alarm Diagnostic System is used with which the signals from many kinds of sensors installed in the Mini-Tunnel System are calculated with a computer.