Search Results

Current Heavy Duty testing is performed almost exclusively on engine dynamometers. The limitations of this method to obtain detailed emission data for heavy duty vehicles operating in the field are widely known. The wide variety of vehicles into which an engine type may be fitted and the disparate operating conditions that the vehicle is then subject to, mean that the real environmental impact of heavy duty vehicles can never be established. A Variable Temperature Emissions Chamber (VTEC) has been developed and used for chassis dynamometer testing of numerous road vehicles right up to Double Decker Buses. This facility enables accurate emissions data to be measured for specific vehicles in their real operating environments. The facility is equipped to simulate ambient temperatures from -30°C to + 50°C and with a high volume, speed tracking air flow. Driving cycles have been developed for buses and trucks, both from detailed on-road data logging and from simulated operations.