Abstract: A fuel injection system deliberately utilizing after injection so as to improve the engine combustion and reduce soot and NOx, wherein at least one operating valve is provided for operating a first injection port group and second injection port group, after injection is performed consecutively after main injection in a high load region, fuel is injected from the first injection port group and second injection port group at the time of main injection, fuel is injected from the first injection port group at the time of after injection, the actual injection pressure near the first injection port during the after injection period is higher than the actual injection pressure near the first injection port during the main injection period, the operating valve opens the first injection port group to start the injection, then the operating valve opens the second injection port group simultaneously or in a short time as well to perform the main injection, the operating valve closes the second injection port group, then

Abstract: A traffic jam detection system and method to estimate a traffic jam condition ahead of a vehicle. When a vehicle arrives at the tail end of a traffic jam, information is related to the tail end of the traffic jam is transmitted to an information center. The information center collects this information related to plural traffic jams from on-vehicle information terminals of a number of vehicles and develops estimated tail end information for each of the traffic jams. The information center transmits the estimated tail end information to vehicles approaching traffic jams for the driver to determine whether a traffic jam should be avoided or not.