Patent ID: 6308517
Filing Date: 2001-10-30
Classification: F02B,F02D,F02M,Y02T

Abstract:
A system for automatic charging pressure control and automatic exhaust gas recirculation control in an internal-combustion engine, said system comprising:an exhaust gas turbocharger with a turbine having a variable adjustable cross-section and a compressor, said compressor being connected in line with a suction pipe and said turbine being connecting in line with an exhaust gas pipe;an air flow sensor connected upstream of said compressor in the suction pipe;a pressure sensor connected in line with said suction pipe for measuring charging pressure and an exhaust gas recirculation pipe connecting said exhaust gas pipe with said suction pipe; andan automatic control device which controls exhaust gas recirculation during a first low load-rotational speed range of said internal combustion engine and which automatically controls a charging pressure in the suction pipe during a second higher load-rotational speed range of the internal combustion engine, said automatic control device including a first controller providing a first output for varying the cross-section of the turbine in response to a command variable for adjustment of an exhaust gas recirculation delivery gradient to provide exclusive control of said exhaust gas recirculation control from said air flow sensor in the suction pipe during operation of said engine in said first low load-rotational speed range and wherein said first controller provides a second output for the variation of the cross-section of the turbine in response to a command variable from said pressure sensor for automatic charging pressure control during the second higher load-rotational speed range of said engine.