Abstract: A water injection device for an internal combustion engine includes at least one water tank for storing water, at least one water injector for injecting water into the engine, at least one conveyor module including a conveyor element for conveying water from the water tank into the water injector, at least one first connection, at least one second connection, and at least one third connection. The first connection is configured on the conveyor module which is connected to the water tank by at least one first line. The second connection is configured on the conveyor module which is connected by at least one second line to the water injector. The third connection is configured on the conveyor module which is connected to the water tank by at least one return line. The conveyor module includes at least one heating device for heating water flowing through the conveyor module.

Abstract: A method for functional monitoring of an apparatus for variable setting of a cylinder compression in a reciprocating-piston internal combustion engine is described, including ascertaining a value of an engine parameter which is indicative of an engine position of the internal combustion engine at a defined cylinder compression; comparing the ascertained value with a further value of the engine parameter; and determining, depending on a result of the comparison, whether the apparatus for variable setting of the cylinder compression is functioning correctly.

Abstract: A water injection device for an internal combustion engine includes at least one water tank for storing water, at least one water injector for injecting water into the engine, at least one conveyor module including a conveyor element for conveying water from the water tank into the water injector, at least one first connection, at least one second connection, and at least one third connection. The first connection is configured on the conveyor module which is connected to the water tank by at least one first line. The second connection is configured on the conveyor module which is connected by at least one second line to the water injector. The third connection is configured on the conveyor module which is connected to the water tank by at least one return line. The conveyor module includes at least one heating device for heating water flowing through the conveyor module.

Abstract: A method for operating a hybrid drive system which includes ascertaining an overall cost function that takes into account the cost function, which is a function of the operating point, for minimizing an energy usage of the hybrid drive system, and that takes into account one or more partial cost functions, which are a function of the operating point, which are each assigned to a requested special function; determining an optimized operating point of the hybrid drive system corresponding to an optimization according to the ascertained overall cost function; operating of the hybrid drive system at the operating point; and executing of those of the requested special functions for which the determined operating point is within an operating range assigned to the respective special function.

Abstract: A method for diagnosing a variable setting of a compression ratio in a reciprocating internal combustion engine, an error of the variable setting of the compression ratio, being signaled as a function of a measured state variable of the exhaust gas system, in particular a measured exhaust gas temperature.

Abstract: A method for functional monitoring of an apparatus for variable setting of a cylinder compression in a reciprocating-piston internal combustion engine is described, including ascertaining a value of an engine parameter which is indicative of an engine position of the internal combustion engine at a defined cylinder compression; comparing the ascertained value with a further value of the engine parameter; and determining, depending on a result of the comparison, whether the apparatus for variable setting of the cylinder compression is functioning correctly.

Abstract: A method for operating a hybrid drive system which includes ascertaining an overall cost function that takes into account the cost function, which is a function of the operating point, for minimizing an energy usage of the hybrid drive system, and that takes into account one or more partial cost functions, which are a function of the operating point, which are each assigned to a requested special function; determining an optimized operating point of the hybrid drive system corresponding to an optimization according to the ascertained overall cost function; operating of the hybrid drive system at the operating point; and executing of those of the requested special functions for which the determined operating point is within an operating range assigned to the respective special function.