Abstract: The disclosure relates to a method for checking a steer-by-wire steering system that includes a steering device, a steering wheel, an actuator configured to exert a torque on the steering wheel, and a control unit configured to correlate a steering wheel angle of the steering wheel with a steering angle of the steering device The method comprises the following steps: i) the actuator is controlled in a closed-loop manner such that the steering wheel angle is correlated with a desired angle and a temporal progression of a state variable of the steering wheel and/or of the actuator is determined; ii) a frequency spectrum of the temporal progression of the state variable is determined and an amplitude of a predefined spectral component of the frequency spectrum is determined; and, iii) a state of the mechanical coupling is classified depending on the amplitude of the spectral component.

Abstract: Various systems and methods are provided for identifying cylinder knock. In one example, cylinder knock may be identified based on a knock monitor that identifies knock based on output from a crankshaft speed sensor.

Abstract: Various systems and methods are provided for identifying cylinder misfire. In one example, cylinder misfire may be identified based on a misfire monitor that differentiates a single-cylinder misfire event from a multi-cylinder misfire event based on output from a crankshaft speed sensor.

Abstract: Various systems and methods are provided for identifying cylinder knock. In one example, cylinder knock may be identified based on a knock monitor that identifies knock based on output from a crankshaft speed sensor.

Abstract: A method for controlling an engine includes, with a fuel injector, injecting a quantity of fuel into a cylinder of the engine for combustion. The method further includes calculating a torsional power level for the cylinder in response to the combustion of the injected quantity of fuel, mapping the torsional power level to an injected fuel mass, and comparing the injected fuel mass to a reference fuel mass to determine a fuel mass offset. The engine may be controlled based on the determined fuel mass offset.

Abstract: Various systems and methods are provided for identifying cylinder misfire. In one example, cylinder misfire may be identified based on a misfire monitor that differentiates a single-cylinder misfire event from a multi-cylinder misfire event based on output from a crankshaft speed sensor.