Abstract
A one-dimensional (1D) simulation calculation model was created using GT-Power software to investigate the effect of an exhaust gas recirculation (EGR) in concert with the Miller cycle on engine fuel economy and using a 1.5 T gasoline direct injection (GDI) engine as the source engine. The engine was tested under partial loading, full loading, and declared working conditions. The results show that under partial load, the Miller cycle could improve engine fuel economy by reducing pumping losses. In the low-speed 1000 r/min full load region, the Miller cycle had a significant effect on increasing the engine fuel economy. When the Miller intensity was −29 °CA, the fuel consumption decreased by a maximum of 10.5%. At medium speeds, 2000 r/min to 3600 r/min, the Miller cycle did not improve fuel economy significantly. For the Miller cycle with late intake valve closure (LIVC), when the EGR rate was about 7%, the fuel consumption was reduced by about 1.3% compared with the original engine at the same EGR rate. When opposed to the original engine without EGR, the fuel consumption was lowered by approximately 3.2 percent.
Highlights
Stringent energy conservation and emission regulations are driving continuous innovation in the field of engine technology and innovations
The results revealed that using a high load operation with late intake valve closure (LIVC) increased fuel economy by 4.7 percent
When the exhaust gas recirculation (EGR) rate rose above 17%, as the EGR rate increased, the fuel economy deteriorated
Summary
Stringent energy conservation and emission regulations are driving continuous innovation in the field of engine technology and innovations. In order to improve engine fuel economy, researchers mainly start from the combustion process and the mechanical part. Hunicz et al [1] studied the combustion stability of SACL (spark-assisted compression ignition) in an attempt to improve thermal efficiency and reduce NOx emissions by studying the SACL/HCCL (homogeneous charge compression ignition) transition. By analyzing the shape of the piston ring, Wróblewski et al [2,3] tried to improve the mechanical efficiency and achieve the purpose of increasing the thermal efficiency. The Miller cycle and EGR technology have become research hotspots due to their inhibitory effect on knocking and improved economics [4,5,6,7]. EGR technology introduces exhaust gas into a cylinder to participate in combustion again, reducing throttle loss and heat transfer loss, thereby improving engine fuel economy
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