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The physical properties of ethanol make difficult the cold start of engines using only this fuel. The solution most adopted consists in the utilization of an auxiliary gasoline reservoir and the injection of this fuel when it is necessary. In this work, it is presented a new concept for the cold start system using gasoline injection that consisted in the use of a mini fuel rail, so called because of its compact layout that through the use of calibrated orifices allows the fuel injection as jets directly in the admission valves. It presents the CFD simulations, conducted to improve the system performance and the bench laboratory tests performed to evaluate the fuel distribution and to analyze the fuel jets.

The following article describes a method developed to control the ultrasonic fuel rail welding. It is done monitoring some physical phenomena during the process, like vibration amplitude, welding energy and its duration. Based on statistical analysis, durability and aging tests on a great population of manufactured parts, it was possible to classify those parameters and build a real time filter capable to segregate bad parts in less than one second, just after process is done. This way, it is possible to purge the bad parts before spending more time and resources in a nonconforming segment.