The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 2022
Filed:
Apr. 05, 2018
Volkswagen Aktiengesellschaft, Wolfsburg, DE;
Sebastian Heinken, Braunschweig, DE;
Matthias Kreft, Wolfsburg, DE;
VOLKSWAGEN AKTIENGESELLSCHAFT, Wolfsburg, DE;
Abstract
The invention relates to a method for operating an internal combustion engine () having an exhaust-gas turbocharger () for compressing the air fed to the internal combustion engine (), wherein a drive power of a turbine () of the exhaust-gas turbocharger () in an exhaust tract () of the internal combustion engine () is changed through variation of a turbine geometry of the turbine (), wherein, in a first control algorithm (I), a setpoint charge pressure (pL) at the outlet of the compressor () of the exhaust-gas turbocharger () in the air feed tract () upstream of the combustion motor () is controlled in a manner dependent on a setpoint exhaust-gas back pressure (pT) to be set in an exhaust tract () downstream of the combustion motor () upstream of the turbine () of the internal combustion engine (), wherein the setpoint charge pressure (pL) is assigned an opening cross-sectional area of the turbine (), which is controlled, by means of an actuating stroke of an actuating element () assigned to the turbine (), in a manner dependent on a setpoint value () assigned to the predefined setpoint charge pressure (pL). According to the invention, provision is made for the actuating element (), which is actuated by means of the first control algorithm (I), of the turbine () to be controlled by means of a second control algorithm (II), with predefinition of an upper threshold value of the setpoint exhaust-gas back pressure (pT) in the exhaust tract () upstream of the turbine () by intervention into the first control algorithm (I) with an adapted setpoint value ('), if, in a primary control path a) of the second control algorithm (II), a control deviation (ΔpT) upstream of the turbine () arises which is formed from an actual exhaust-gas back pressure (pT) upstream of the turbine () and the predefined setpoint exhaust-gas back pressure (pT) upstream of the turbine (), and, in a secondary control path b) of the second control algorithm (II), a control deviation (ΔpL) downstream of the compressor () arises which is formed from an actual charge pressure (pL) of the compressor () and the setpoint charge pressure (pL) at the outlet of the compressor ().