Abstract: The control system of the invention is associated with an engine provided with means for measuring one or several parameters including pressures (in the cylinder, induction pressure, exhaust pressure) for each cylinder, acceleration, injection needle lift, knock detection, engine torque, etc., and with means for the angular coding of the crankshaft position. The control system includes a synchronization set (7) co-operating with angular discrimination means so as to readjust automatically at any time the angular coding data with respect to the combustion cycles. An acquisition set digitizes at a high frequency the various data measured, and notably the pressure values taken during each cycle, simultaneously in all the cylinders. A processing set (18) including notably a fast digital processor suited for determining in real time complex physical parameters such as the man indicated pressure (PMI) at each cycle or each engine revolution, stability factors of these parameters in time, etc.

Abstract: A pump-injector assembly comprises a plunger slidable in a bore. The plunger has a first or upper position in which fuel is admitted into the lower part of the injector bore through an inlet port, and a second or lower position in which a tapered lower end of the plunger obturates fuel spray nozzles provided through the bottom of the bore. A recess is provided in the plunger wall and communicates with the bottom of the bore through a longitudinal passageway of the plunger. A ramp inclined to the plunger axis is formed by the upper edge of the recess and co-operates with a fuel outlet port located on the wall of the injector bore to control the beginning of the injection. Rotation of the plunger relative to this outlet port permits adjustment of the amount of injected fuel charge.

Abstract: A fuel pump-injector unitary assembly comprises a plunger slidable in a bore and provided with a longitudinal passage-way, in combination with a metering ring surrounding the plunger and housed in an annular chamber of the injector body. The plunger is movable into a first or upper postion in which fuel is admitted into the lower part of the injector bore through an inlet port, and a second or lower position in which the tapered lower end of the plunger obturates fuel spray nozzles provided at the bottom of the bore. Fuel metering results from the cooperation of an inclined ramp of the ring with a fuel discharge duct transversely extending through the plunger and connected with the longitudinal passage-way thereof. Relative rotation of the metering ring and of the plunger permits adjustment of the injected fuel charge.