em nhờ các cụ phụ giúp em dịch doạn này:cụ thể là các cụm từ em bôi màu ,ai biết nghĩa thì giúp em với! em cám ơn các cụ trứơc! The maximum brake torque (MBT) spark timing of stratified- charge GDI engines at part load is generally more advanced than that of the conventional PFI engine. Fraidl et al.  reported that the main part of the stratified GDI combustion occurs before TDC on compression for MBT timing, which is quite advanced. For the GDI engine operating in the homogeneous mode at full load, a heat release curve is obtained that is nearly identical to that from the PFI engine. A slightly reduced heat release rate may be observed from some GDI engines at full load, which is indicative of some charge inhomogeniety.