Abstract: A method for regulating the charge pressure pboost of a supercharged internal combustion engine is disclosed. The method may include adjusting each of two wastegates, a variable turbine geometry, and a downstream compressor bypass valve to regulate engine boost pressure as a function of a first setpoint value for pressure between compressors and a pressure difference in a first regulation loop, a second setpoint value for pressure downstream of multiple compressors, and the pressure difference in a second regulation loop.

Abstract: A method for regulating the charge pressure pboost of a supercharged internal combustion engine is disclosed. The method may include adjusting each of two wastegates, a variable turbine geometry, and a downstream compressor bypass valve to regulate engine boost pressure as a function of a first setpoint value for pressure between compressors and a pressure difference in a first regulation loop, a second setpoint value for pressure downstream of multiple compressors, and the pressure difference in a second regulation loop.

Abstract: A method for operating a turbocharger arrangement of an internal combustion engine, the turbocharger arrangement comprising a low-pressure and a high-pressure turbocharging stage arranged sequentially, the low-pressure turbo-charging stage comprising a low-pressure turbine with a sensorless low-pressure turbine bypass valve, is provided. The method comprises evaluating at least one sensor signal of the turbocharger arrangement for detecting a failure mode of the sensorless low-pressure turbine bypass valve. In this way, the low-pressure turbine bypass valve may be monitored for degradation without utilizing a position sensor.

Abstract: A method for operating a turbocharger arrangement of an internal combustion engine, the turbocharger arrangement comprising a low-pressure and a high-pressure turbocharging stage arranged sequentially, the high-pressure turbocharging stage comprising a high-pressure compressor with a sensorless compressor bypass valve, comprises evaluating at least one sensor signal of the turbocharger arrangement for detecting a failure mode of the compressor bypass valve.

Abstract: Methods are provided for controlling an engine. One method may include adjusting airflow to a turbocharger arrangement with a turbine bypass valve bypassing a first turbine from a high-pressure turbocharger and a wastegate bypassing a second turbine from a low-pressure turbocharger; responsive to valve degradation, setting the turbine bypass valve fully open and the wastegate fully closed; and limiting engine torque based on a flow through a compressor of the low pressure turbocharger. In the event of valve degradation, limiting torque may reduce overspeed and surge of the low pressure turbocharger.

Abstract: Systems and methods for determination of exhaust back pressure in a turbocharged engine are disclosed. In one example approach, a method for determination of exhaust back pressure for an engine with a two-staged turbocharger comprises measuring a temperature downstream the engine, a temperature downstream the turbocharger, and/or a pressure downstream the turbocharger; determining a flow parameter for exhaust mass flow; estimating an overall turbine pressure ratio or a difference with a model of the turbocharger based on the measured and determined parameters; and determining the exhaust back pressure downstream the engine with the model.

Abstract: A method for operating a turbocharger arrangement of an internal combustion engine, the turbocharger arrangement comprising a low-pressure and a high-pressure turbocharging stage arranged sequentially, the high-pressure turbocharging stage comprising a high-pressure compressor with a sensorless compressor bypass valve, comprises evaluating at least one sensor signal of the turbocharger arrangement for detecting a failure mode of the compressor bypass valve.

Abstract: A method for operating a turbocharger arrangement of an internal combustion engine, the turbocharger arrangement comprising a low-pressure and a high-pressure turbocharging stage arranged sequentially, the low-pressure turbo-charging stage comprising a low-pressure turbine with a sensorless low-pressure turbine bypass valve, is provided. The method comprises evaluating at least one sensor signal of the turbocharger arrangement for detecting a failure mode of the sensorless low-pressure turbine bypass valve. In this way, the low-pressure turbine bypass valve may be monitored for degradation without utilizing a position sensor.

Abstract: A method and device for regeneration of a particulate filter situated on an exhaust line of an engine. The method determines a soot burden on the filter based on knowledge of a differential pressure ?P at ends of the filter and triggers combustion of the soot when the burden reaches a predetermined level. A pressure Pdownstream downstream from the filter is modeled without use of a pressure sensor and Pupstream is determined without use of a pressure sensor using the relationship Pupstream=?P+Pdownstream. The burden is determined by the relationship ?P=f (Qvol, mass of soot), with Qvol=K×(Qair+?fuel×Qcarb)×N×Tupstream/Pupstream, where K is a constant, Qair denotes a mass flow of air, ?fuel denotes a density of the fuel, Qcarb denotes a volumetric quantity of fuel, N denotes an rpm of the engine, and Tupstream denotes an absolute temperature measured upstream from the filter.

Abstract: The invention relates to a method for the regeneration of a particulate filter (7) arranged on an exhaust line (5) of an engine (3) of a motor vehicle (1), wherein the charge of said filter (7) is evaluated by means of a model wherein P=f(Qvol, soot mass), and P=Pup?Pdown, and Qvol=K*(Qair+pfuel*Qcarb)*N*Tup/Pup, or Pup et Pdown are the pressures measured respectively upstream and downstream from said particulate filter (7). The inventive method is characterized in that Pdown is modelled and in that Pup is determined by means of the relation Pup=P+Pdown.

Abstract: For their wet purification, gases flowing in a line are sprayed with scrubbing liquor, the resulting mixture of gas and liquid is passed through a cyclone separator. The gas is initially sprayed in a pre-scrubbing line and the gas which contains scrubbing liquor is subsequently conducted through a substantially horizontal accelerating line having at its entrance a cross-sectional area which is 1.5 to 8 times larger than the cross-sectional area at its exit. The exit of the accelerating line communicates with the cyclone separator. Purified gas is withdrawn from the cyclone separator.