PM and CO2 Reduction in a Dual-fuel Heavy-duty Diesel Engine during the Freeway Part of Transient Worldwide Emission Tests

The objective of this study is to describe the results on Particle Matter and CO₂ emissions when an existing Heavy-Duty diesel engine for on-highway truck applications is converted to a Dual-fuel engine (diesel + Natural Gas) during the freeway part of transient worldwide emission tests. A Dual-fuel engine with Homogeneous Gas Charge Injection in the intake line before turbocharger was considered. The results showed the feasibility of this kind of technology for transient operation reaching a significant reduction of Particle Matter plus a decrement in CO₂ emissions compared to diesel baseline engine. The results of gas energy replacement ratio, brake fuel conversion efficiency, CO and unburned hydrocarbons in the exhaust gases are also shown.