Abstract: A mixture pilot control for operating an internal combustion engine, in particular a gasoline engine of a motor vehicle, is provided. The mixture pilot control determines at least one composition of an air-fuel mixture required for a predetermined target air-fuel mixture ratio. The internal combustion engine is also provided with a lambda control with at least one lambda probe arranged in the exhaust gas flow of the internal combustion engine for determining a deviation of the actual air-fuel ratio from the predetermined target air-fuel ratio. Operating-parameter-dependent correction factors for the composition of the air-fuel mixture by the mixture pilot control are determined in dependence on the lambda control deviation, at least one of the load and/or the rotational speed and/or the temperature of the internal combustion engine, and further operating parameters of the vehicle other than the load, rotation speed or temperature of the internal combustion engine.

Abstract: A mixture pilot control for operating an internal combustion engine, in particular a gasoline engine of a motor vehicle, is provided. The mixture pilot control determines at least one composition of an air-fuel mixture required for a predetermined target air-fuel mixture ratio. The internal combustion engine is also provided with a lambda control with at least one lambda probe arranged in the exhaust gas flow of the internal combustion engine for determining a deviation of the actual air-fuel ratio from the predetermined target air-fuel ratio. Operating-parameter-dependent correction factors for the composition of the air-fuel mixture by the mixture pilot control are determined in dependence on the lambda control deviation, at least one of the load and/or the rotational speed and/or the temperature of the internal combustion engine, and further operating parameters of the vehicle other than the load, rotation speed or temperature of the internal combustion engine.

Abstract: A cell culture measuring system and to a method for comparative investigations on cell cultures. In a cell culture measuring system, cell cultures are cultivated on a cell culture carrier within a flow passage. An inflow and an outflow for a liquid culture medium and at least two sensors are present. At least one further inflow for a test liquid is arranged in the flow direction of the culture medium between the inflow for the culture medium and the outflow of the flow passage so that the test liquid flowing through the flow passage by displacement of the culture medium only flows around and/or over some of the cells present on the cell culture carrier. At least one sensor is arranged in the region of the cells not influenced by test liquid and at least one sensor is arranged in the region of cells influenced by test liquid.

Abstract: The invention relates to a cell culture measuring system and to a method for comparative investigations on cell cultures. It is the object of the invention to propose possibilities with which comparative investigations can be carried out on cell cultures under the same conditions on cells which are influenced by a test liquid and on cells which are not influenced by test liquid. In a cell culture measuring system in accordance with the invention, cell cultures are cultivated on a cell culture carrier within a flow passage. An inflow and an outflow for a liquid culture medium and at least two sensors are present. In addition, at least one further inflow for a test liquid is arranged in the flow direction of the culture medium between the inflow for the culture medium and the outflow of the flow passage so that the test liquid flowing through the flow passage by displacement of the culture medium only flows around and/or over some of the cells present on the cell culture carrier.