Preliminary evaluation of emissions from off road mobile machinery operating in real working conditions

The paper presents results of the pollutants emission measurements from the exhaust system of the forklift truck as a representative of the off-road mobile machinery operating in real conditions. Directive 96/68/EC does not include spark ignition engines with maximum power output greater than 19 kW. In order to check the emission characteristics of the off-road mobile machinery equipped with such engine, the tests have been carried out of the H16T type forklift truck, manufactured by Linde company, fuelled with LPG. The portable analyzer (PEMS) Semtech-DS by Sensors was used for the measurements. It allowed making the necessary calculations to determine the road - test pollutants emission as a function of time. The tests included emission testing in stationary conditions and roadside emission testing of the forklift truck. The paper contains illustrations with many figures and tables showing CO, CO2, THC and NOx emissions versus speed, time and fork load of the tested machine. It contains discussion on the possibility of road emission measurements expressed in g/km for off-road machineries as well as usefulness of these measurements using portable emission measurement systems for the off-road machinery.