Abstract: An improved fuel supply system for a turbocharged diesel engine, of the general type comprising a fuel pump which conveys fuel at an intermediate pressure to a high-pressure distributor which has a fuel-injection timing piston that adjusts the injection timing as a function of the intermediate fuel pressure. The improved system includes a control unit which reduces the pressure applied to the timing piston when the engine is subjected to a demand for increased fueling at low turbocharger boost pressures. This causes the injection timing to be retarded, which in turn increases the exhaust temperature and pressure and, thus, increases the turbocharger boost pressure. After a controlled interval during which boost pressure has risen the desired amount, the control unit allows the pressure applied to the timing piston to rise back to its former value, whereupon the injection timing returns to normal.

Abstract: A direct-injection internal combustion engine has a combustion chamber in the form of a body of rotation in the piston head. Means are provided for creating air swirl about the longitudinal axis of the combustion chamber. A fuel-injection nozzle is arranzed to spray fuel on the combustion chamber wall substantially as a film at upper engine speeds and loads, and to mix the fuel directly with the air at idling and lower engine speeds and loads. The nozzle has a nozzle needle longitudinally movable in a nozzle body to open the nozzle for fuel injection. In order to reduce the size of the nozzle, the nozzle needle is arranged to move in a direction outwardly of the nozzle body to open the nozzle and inwardly of the nozzle body to close the nozzle. The nozzle is adapted to open at a slower rate at lower engine speeds and loads and at a faster rate at upper engine speeds and loads.