APPARATUS FOR CONTROLLING THE FEEDBACK OF THE CHARGING PRESSURE OF A COMBUSTION ENGINE

摘要

An automatic control for an adjustable turbosupercharger in the air supply of an internal combustion engine adds a static anticipatory control signal and a dynamic anticipatory control signal to the error signal that is provided to an actuating mechanism for the control of the supercharger. The error signal is obtained by comparing actual charging pressure with a reference charging pressure for one portion of the control displacement and in the other portion of the control displacement the error signal is obtained by comparing actual air quantity supplied to an engine cylinder with a reference air quantity. This results from a limiting device interposed in the charging pressure control loop. The static anticipatory control depends on engine speed and engine load and is supplied with additive corrections for engine temperature and for battery voltage. A limit value dependent upon engine speed is introduced through a minimum circuit to put a lower limit on the sum of error signal and static anticipatory control and the resulting signal is then added to a dynamic anticipatory control and derived from rate of control displacement. The control signal is also interrupted during the engine start period.