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1. A gas ultrasonic transducer system for operating a diesel common-rail engine, comprising: an electronic control unit; a water tank; a gas tank with a gas supply shut-off valve; a gas level sensor; a gas pump operably connected with the gas tank; a water pump operably connected with the water tank; a mixer comprising a water level sensor and an ultrasonic transducer adapted to generate water vapor and gas mixture; characterized in that the mixer, configured for mixing water vapor and gas, comprises two compartments: the upper compartment and the lower compartment, the means for separation of the upper and the lower compartments comprising an anti-reflux valve adapted to regulate the flow of water vapor from the lower compartment to the upper compartment, while preventing liquid water from flowing into the upper compartment; wherein the upper compartment of the mixer comprises an outlet operably connected with an engine intake manifold; wherein the outlet of the gas pump is operably connected with the upper compartment of the mixer, the outlet of the water pump is operably connected with the lower compartment of the mixer, where the ultrasonic transducer is at least partially located in the lower compartment of the mixer; and wherein said gas ultrasonic transducer system is configured to transition between a first mode of operation, being a standby mode, and a second mode of operation, being an operation mode.
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