Off-Road Diesel Engine Transient Response Improvement by Electrically Assisted Turbocharging

• DOI: 10.4271/2011-24-0127
• Publication Date: 2011-09-15T18:01:05Z
• Authors: Nicola Terdich; Ricardo F. Martin...; David A. Howey; Colin D. Copeland; Aaron Costall
• Keywords: Transient (computer programming)

Turbocharged diesel engines are widely used in off-road applications including construction and mining machinery, electric power generation systems, locomotives, marine, petroleum, industrial agricultural equipment. Such contribute significantly to both local air pollution CO2 emissions subject increasingly stringent legislation. To improve fuel economy while meeting limits, manufacturers exploring engine downsizing by increasing boost levels. This allows an increase IMEP without mechanical losses, which results a higher overall efficiency. However, this can lead poorer transient response primarily due turbo-lag, is major penalty for subjected fast varying loads. recover response, the turbocharger be electrically assisted means of high speed motor/generator. When load increased, electrical machine acts as motor accelerate so that torque demand met rapidly. Conversely, when delivery exceeds act generator energy would otherwise wastegated. paper presents model electrically-assisted turbocharged step demand. The base representative 7-litre intercooled has been implemented Matlab-Simulink calibrated against test bed data. analysis dynamic behaviour with different levels assist turbocharger. show improves assist, compressor surge occur generating mode limitations on present.