In order to improve the diesel engine performance under plateau (high altitude) conditions,\na new Speed Adjustable Compound (SAC) supercharging method is proposed. A simulation model\nbased on a six-cylinder V-type turbocharged intercooler diesel engine is built on the GT-POWER\nplatform, and then simulation-based research is carried out. A genetic algorithm (GA) is used to\nidentify the best operation parameters, including the supercharger speed and fuel injection quantity\nunder steady state conditions. Transient performance is obtained through starting process simulation\nof a vehicle with SAC engine on theMATLAB/Simulink GT-POWER co-simulation platform. Both the\nsteady and transient performance of the SAC engine are compared with those of the original engine.\nResults show that the torque of the SAC engine at full load is significantly increased when the\nengine speed n < 1600 r/min. The increment of the maximum torque can reach up to 31% at\n1000 r/min compared to that of the original engine, while the peak torque is increased by 9%. The fuel\nconsumption deterioration is restricted within 5%. What�s more, the SAC engine can help reducing\nthe acceleration time by 20% during tip-in pedal events during the vehicle starting process.
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