Technical Paper
Measurement of Unregulated Exhaust Emissions from Heavy Duty Diesel Engines with Mini-Dilution Tunnel
1990-02-01
900643
Many reports on characterization of unregulated exhaust emissions from diesel engines and its measurement methods have been presented, but the number of objective chemical compositions used in those experiments are limited. Those reports have referred to use of a large and expensive full-flow dilution tunnel specified by US EPA, and also to the fact that, in case of a partial-flow dilution tunnel which is called “mini-tunnel”, the use should be limited only to steady state engine operations. The authors reported in SAE Paper 890181 that a multi-tube type mini-dilution tunnel, which was compact and less expensive, had good agreement with the full-flow dilution tunnel required by US FTP for heavy-duty diesel engines, when the regulated exhaust emissions were measured on a heavy-duty diesel engine under steady state and transient operaton conditions.