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The growing necessity for less carbon emission vehicles due to environmental issues and more rigid legislation rules encourages many automotive companies to develop low CO2 emission engines. This motivation leads Mercedes-Benz do Brazil to the development of a “dual-fuel” diesel engine for buses that works with diesel and CNG (Compressed Natural Gas) fuel. One of the challenges for the development of this kind of engine is the electric/electronic integration between the diesel engine ECU (Electronic Control Units) and the CNG system ECU that coordinates the engine gas injectors.

This work reports the first stage in the experimental optimization of a medium duty truck, equipped with a new engine, with four cylinders and high power, concerning both the noise emission for the environment and the noise level in the passengers' compartment. In the first stage of this work, comparative measurements among the noise levels for vehicles in different configurations were made, in order to identify the most important sources in the vehicle's noise level, as well as to serve as indicative for project improvements. Each system configuration was analyzed separately, in order to obtain a comparative evaluation of the different vehicle configurations along the whole period of measurements.