System for controlling the inlet pressure in a turbocharged combustion engine

Claim 1

In a system for controlling the charge pressure in a turbocharged combustion engine, comprising means for sensing the actual charge pressure, means to change the charge pressure, means for sensing engine speed and signal processing means disposed to receive from the sensing means signals representing pressure and engine speed and to send control signals dependent thereon to said means to change the charge pressure, said signal processing means comprising means with a memory function in which a command value for the charge pressure as a function of engine speed is stored for a predetermined engine speed range, the upper limit of which is the maximum rotational speed of the engine, the command value lying below the limit for knocking combustion for a given fuel quality and a given ignition timing at steady state operation; the improvement comprising a throttle position sensor coupled to the signal processing means and emitting a signal representing the degree of opening of the throttle, said signal processing means correcting the stored command value with a correction factor dependent on the degree of opening of the throttle.