The invention relates to a method for operating an internal combustion engine (100) having an exhaust-gas turbocharger (5, 10, 15) for compressing the air fed to the internal combustion engine (100), wherein a drive power of a turbine (10) of the exhaust-gas turbocharger (5, 10, 15) in an exhaust tract (20) of the internal combustion engine (100) is changed through variation of a turbine geometry of the turbine (10), wherein, in a first control algorithm (I), a setpoint charge pressure (pL.sub.Soll) at the outlet of the compressor (5) of the exhaust-gas turbocharger (5, 10, 15) in the air feed tract (50) upstream of the combustion motor (55) is controlled in a manner dependent on a setpoint exhaust-gas back pressure (pT1.sub.Soll) to be set in an exhaust tract (20) downstream of the combustion motor (55) upstream of the turbine (10) of the internal combustion engine (100), wherein the setpoint charge pressure (pL.sub.Soll) is assigned an opening cross-sectional area of the turbine (10), which is controlled, by means of an actuating stroke of an actuating element (25) assigned to the turbine (10), in a manner dependent on a setpoint value (25.sub.Soll) assigned to the predefined setpoint charge pressure (pL.sub.Soll). According to the invention, provision is made for the actuating element (25), which is actuated by means of the first control algorithm (I), of the turbine (10) 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.sub.1Soll) in the exhaust tract (20) upstream of the turbine (10) by intervention into the first control algorithm (I) with an adapted setpoint value (25′.sub.Soll), if, in a primary control path a) of the second control algorithm (II), a control deviation (ΔpT) upstream of the turbine (10) arises which is formed from an actual exhaust-gas back pressure (pT.sub.1lst) upstream of the turbine (10) and the predefined setpoint exhaust-gas back pressure (pT.sub.1Soll) upstream of the turbine (10), and, in a secondary control path b) of the second control algorithm (II), a control deviation (ΔpL) downstream of the compressor (5) arises which is formed from an actual charge pressure (pL.sub.lst) of the compressor (5) and the setpoint charge pressure (pL.sub.Soll) at the outlet of the compressor (5).

A method for carrying out an on-board diagnostic function of a vehicle includes activating an on-board diagnostic function of the vehicle and subjecting a predefined gas pedal value of the vehicle to low-pass filtering in order to obtain a smoothed gas pedal value.

A process for fireproofing materials, using the following steps: a) placing a material in contact with a viscoelastic suspension obtained by mixing a pozzolanic material with an alkaline activation solution having at least one soluble metal hydroxide; b) geopolymerizing the viscoelastic suspension; c) obtaining a fireproof material with a geopolymer.

A method for operating a common-rail fuel supply system of an internal combustion engine includes determining, dependent on an operating point of the engine, a set point rate of delivery of the high-pressure pumping device, and a set point pressure for the pressure storage system under high pressure, determining, dependent on a deviation between the set point pressure and an actual pressure in the pressure storage system, for a first part quantity of the throttle valves a closed-loop control portion for the position of the respective throttle valve, and activating the first part quantity of the throttle valves with the closed-loop control portion in addition to open-loop control for only the respective throttle valve of the first part quantity of the throttle valves. The, or each, throttle valve of a second part quantity of the throttle valves is exclusively activated with the open-loop control portion.

Methods and systems for an engine controller are described. In one example, the engine controller includes a reference control system and a disturbance rejection control system. The engine controller avoids use of integral feedback in the reference control system, while permitting integral feedback in the disturbance rejection control system, to improve controller response without unduly increasing engine pumping work.

A control method of a butterfly valve of an internal combustion engine, when said internal combustion engine is running, wherein said butterfly valve is controlled by means of a control signal, indicative of an angular position of said valve, the method comprising a step of applying a first limiting filter of a gradient of said control signal, when a ratio between a target pressure downstream of the butterfly valve and a measured pressure upstream of the butterfly valve is greater than a first predetermined threshold.

A system and method of controlling a turbocharged engine system includes receiving a boost mode selection signal and controlling the turbocharged engine system in response to the boost mode selection signal.

In various embodiments, methods, systems, and vehicle apparatuses are provided. In one exemplary embodiment, a method is provided that includes obtaining a set of inputs, by a processor, pertaining to one or more features that are used to predict the purge flow of a purge canister system of an intake system of a vehicle; obtaining data, by the processor, from sensors about the vehicle's intake system for use by a neural network to enable the processor to classify the set of inputs including the one or more features for purge flow control for use in predicting a presence of purge content in the vehicle's intake system; and obtaining, by the processor, an output from the neural network wherein the output is configured as a binary or continuous output to instruct a vehicle controller to execute an action to fueling control by letting fueling controller choose different gain sets and adaption strategy based on the binary output flag in a case of the binary-output model, or apply an adjustment factor to fueling command in case of a continuous model.

A control method of an engine system is a method of controlling the engine system including an engine with a combustion chamber; a fuel injection valve configured to supply fuel to the engine; and an air-fuel ratio sensor provided in a flow path of exhaust gas from the engine. In the control method, feedback control is performed so that an air-fuel ratio in the combustion chamber becomes a target value by controlling the fuel injection valve, using an air-fuel ratio measured value obtained by the air-fuel ratio sensor. In the feedback control, a transfer function is used, the transfer function being obtained by system identification of a plant having the air-fuel ratio in the combustion chamber serve as an input and the air-fuel ratio measured value obtained by the air-fuel ratio sensor serve as an output. In the control method, a filtering process is performed to an air-fuel ratio measured value used in the feedback control, the filtering process cutting a component having a response speed faster than a delay indicated by the transfer function.

Various methods and systems are provided for controlling emissions. In one example, a controller is configured to respond to one or more of intake manifold air temperature (MAT), intake air flow rate, or a sensed or estimated intake oxygen fraction by changing an exhaust gas recirculation (EGR) amount to maintain particulate matter (PM) and NOx within a range, and then further adjusting the EGR amount based on NOx sensor feedback.