Device for air/fuel ratio estimation in a gas engine

The gas/air ratio setting device has a power measuring device for detecting the power output of the engine and/or a pressure measuring device for detecting the pressure of the gas/air mixture supplied to the engine, coupled to a microprocessor (18) for calculating the required gas/air ratio, with corresponding control of a gas dosing valve (2) supplying the combustion gas to the engine air intake, via an electronic control device (4).