Volkswagen Ag

Volkswagen Aktiengesellchaft

Sebastian Heinken

Javier Bartolome

Christoph Nee

Tim Thaler

Florian Frese

Sebastian Keich

Andre Shurkewitsch

Lars Petersen

Dirk Hagelstein

Christian Steinbrecher

Daniel Beese

Arne Staats

Manuel Vahldiek

Chris Frehse

Pierre Misiek

Matthias Kreft

Hagen Müller

Kirsten Pankratz

Marco Bunjes

Benjamin Frank

A method and device for operating an internal combustion engine having a supercharging system that has an exhaust turbocharger and an electrically driven compressor. An output of the exhaust turbocharger is adjustable by a control element. A boost pressure setpoint is determined for achieving an increased engine torque setpoint. The supercharging system is adjusted to build up the actual boost pressure in accordance with the boost pressure setpoint and a positive scavenging gradient in a cylinder of the internal combustion engine is adjusted as the overriding command variable for driving the supercharging system.

Method and devices for operating an internal combustion engine having a supercharging system

A method for controlling and/or regulating an exhaust gas turbocharger of an internal combustion engine, the exhaust gas turbocharger being protected against an exceeding of a maximum rotational speed, an actual boost pressure being compared with a setpoint boost pressure. The risk of a maximum rotational speed of the exhaust gas turbocharger being exceeded is prevented in that a manipulated variable assigned to the exhaust gas turbocharger is compared with a manipulated variable limit characteristic and is limited, if necessary, the manipulated variable limit characteristic having a time-limited, first portion and a chronologically subsequent, second portion following a change in the setpoint boost pressure, the first portion ending after a predetermined target time, the second portion of the manipulated variable limit characteristic being reduced with respect to the first portion in such a way that the maximum rotational speed of the exhaust gas turbocharger is not reached.

Method for open-loop and/or closed-loop control of an exhaust-gas turbocharger of an internal combustion engine motor vehicle

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 (&#x394;pT) 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 (&#x394;pL) 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 ().

Method for operating an internal combustion engine with an exhaust-gas turbocharger having variable turbine geometry

A method for detecting the icing of a particulate filter, especially of a gasoline particulate filter, includes determining the temperature of the exhaust gas flow flowing through the particulate filter, whereby icing of the particulate filter is detected on the basis of the determined temperature of the exhaust gas flow. The method is improved in that the temperature of the exhaust gas flow upstream from the particulate filter and the temperature of the exhaust gas flow downstream from the particulate filter are determined, whereby on the basis of the measured temperature difference, the heat input into the particulate filter and the quantity of water present in the particulate filter are determined, whereby the aggregates states of the water present in the particulate filter are calculated by drawing up a balance of the heat quantity.

Method for detecting the icing of a particulate filter, especially of a gasoline particulate filter

A method for determining a desired intake manifold pressure of an internal combustion engine by means of an iterative method, wherein a cylinder charge is determined for an intake manifold pressure iterated during the iterative method, and the desired intake manifold pressure is determined as a function of the cylinder air charge that has been determined. In addition, a control device for carrying out the method is provided.

Method and control device for determining a desired intake manifold pressure of an internal combustion engine

A method for operating an internal combustion engine with a system for supercharging that includes an exhaust turbocharger and an electrically driven charging device for dynamic assistance during build-up of boost pressure, with: determining a drive criterion of the charging device, establishing an initial quantity of the drive criterion; continuously determining a reduction factor for the drive criterion within a balance period; applying the reduction factor to the initial quantity of the drive criterion; and operating the charging device with the drive criterion reduced by the reduction factor.

Method for operating an internal combustion engine, control unit, and electrically driven charging device

A method for determining a basic boost pressure of a gas conducting system of an internal combustion engine with a turbocharger that has a compressor, a turbine, a shaft connecting the compressor and the turbine, and a turbocharger actuator for varying a flow velocity through the turbine or a pressure ratio across the turbine. The method comprises calculation of an exhaust gas back pressure at the open turbocharger actuator position, wherein the flow velocity through the turbine or the pressure ratio across the turbine is minimal in the open turbocharger actuator position, and determination of the basic boost pressure as a function of the calculated exhaust gas back pressure at the open turbocharger actuator position. An engine controller for carrying out a method for determining a basic boost pressure is also provided.

Method for determining a basic boost pressure of a gas conducting system of an internal combustion engine, and engine controller for carrying out a method of this type

A method for checking the plausibility of a pressure sensor that, during the measurement of a differential pressure, records measured values, whereby the measured values from the pressure sensor are compared to reference values for the differential pressure calculated on the basis of a model; whereby in order to determine the plausibility, at least one deviation of the measured values from the reference values and a difference between a first slope of the changing measured values and a second slope of the changing reference values over the curve of the measured values are taken into account.

Method for checking the plausibility of a pressure sensor

A method for regenerating a particulate filter in an exhaust system of an internal combustion engine, wherein it is thereby provided that the quantity of overrun air in the overrun operation of the combustion engine be adapted to the air required for oxidizing the soot trapped in the particulate filter to achieve a rapid and efficient regeneration of the particulate filter, and it is provided that a throttle valve be opened in overrun operation to an extent that allows a maximum permissible soot conversion without risking thermal damage to the particulate filter.

Method for regenerating a particulate filter in the exhaust system of a gasoline engine

A method for operating an internal combustion engine is provided, wherein the internal combustion engine has at least one combustion engine and a fresh gas line and wherein a compressor, to which a trim adjuster is assigned, is integrated into the fresh gas line, said trim adjuster by which an edge section of the inlet cross section of a compressor wheel can be covered to a variable extent. In this case, the edge section of the inlet cross section is covered relatively little in a release position of the trim adjuster and covered relatively greatly in a covering position of the trim adjuster. It is provided that the trim adjuster is adjusted between the release position and the covering position, when substantially the same compressor pressure ratio and substantially the same fresh gas mass flow and substantially the same compressor efficiency are achieved in both operating positions.

Method for operating an internal combustion engine and the internal combustion engine

A method for determining an air volume in a combustion chamber of a fuel-injection internal combustion engine, especially during a load change condition, including synchronizing a throttle valve setpoint signal to an operating state criterion (t); determining a curve dynamics of the throttle valve position taking into account the synchronized throttle valve setpoint signal; determining an actual air volume quantity at an ACTUAL time point (t); determining a desired time point (t+&#x394;t); predicting a further air volume quantity for the desired time point (t+&#x394;t) and determining a total air volume quantity from the ACTUAL air volume quantity and the further air volume quantity for the desired time point (t+&#x394;t).

Growing community of inventors

Braunschweig, Germany

Sebastian Heinken