Analysis of Transient Emission Data of a Modelyear 1991 Heavy Duty Diesel Engine

A heavy duty diesel engine was developed to meet US-EPA 1991 emission standards, and heavy duty diesel transient cycles (HDDTC) were run with different engine versions.

Actual engine data such as speed, torque, air mass flow, gaseous emissions, temperatures and the carbon- and HC-fraction of particulate matter were transiently recorded.

For each limited pollutant the phases of the HDDTC were identified, where a major contribution to the total cycle emission occurs. Comparing different engine versions, strategies for further reduction of emissions were elaborated. Emphasis was placed on particulate matter.