Method of controlling a two-stage turbocharger of an internal combustion engine

• Main Authors: Martin Miertschink, Paolo Nalbone, Francesco Castorina
• Format: Patent
• Language: English
• Published: 18.04.2018
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

Disclosed is a method of controlling a two-stage turbocharger system for an internal combustion engine equipped with an intake manifold 200. The two-stage turbocharger comprises a first turbocharger 250 and a second turbocharger 550, the second turbocharger 550 operating at a lower pressure than the first turbocharger 250, and a plurality of regulating devices for varying a flow of engine exhaust gas in the two-stage turbocharger system. The regulating devices may be a variable geometry turbo, waste valves or exhaust bypass valves. The method comprises the steps of determining the pressure in the intake manifold, determining a target value for the pressure on the basis of an engine operating point, determining a value of a control variable for the two-stage turbocharger as a function of the difference between the determined pressure and the target pressure, selecting one of the regulating devices on the basis of the determined value of the control variable and actuating the selected regulating device. More than one of the regulating devices can be used when the pressure is high. An internal combustion engine having an engine controller 450 programmed with software to carry out the method is also disclosed.