Disclosed is a method for estimating a level of corrosion of an injector of an engine, the engine including a reference injector and at least one other injector, each injector including a tip in fluidic communication with a combustion chamber specific to each of the injectors, the respective combustion chamber of each injector also being in fluidic communication with an exhaust system of the engine. The method includes: while the engine is stopped, inhibiting a propagation of the gases from the exhaust system toward the tip of the reference injector; determining a static flow rate of an injector and a static flow rate of the reference injector; and estimating a level of corrosion of the injector by comparing the static flow rate of the injector with the static flow rate of the reference injector.

A method for ascertaining the movement of an armature of an electric intake valve, an electrical variable of the electric intake valve being controlled to predefined values with the aid of a two-position controller, a characteristic point in time of the movement of the armature being ascertained based on the switching behavior of the two-position controller.

A method of two-step variable valve lift (VVL) malfunction avoidance learning control may include: in a two-step VVL system which is operated with a main lift and a secondary lift, verifying, by an electronic control unit (ECU), an operation avoidance area based on locking of a lock pin of a cam follower ; performing VVL operation learning, in which a failure of occurrence of the second lift is determined on the basis of a locking failure of the cam follower due to an initially set value of the operation avoidance area; and reflecting the operation avoidance area to the two-step VVL system with a corrected set value which is obtained through the VVL operation learning.

An injection control device includes: a drive control unit that controls energization by correcting an energization instruction time when injecting the fuel by executing the current-drive, and includes an energization time correction amount calculation unit that calculates an energization time correction amount by performing area correction on a current flowing through the fuel injection valve; an abnormality determination unit that determines an abnormality in a control system of the drive control unit; and a correction amount subtraction setting unit that stops a calculation of the energization time correction amount when the abnormality determination unit determines an abnormality, and controls the drive control unit to directly or stepwise reduce the energization time correction amount at an abnormality determination.

Methods and systems for unsticking a stuck gaspath actuator are disclosed. In one embodiment, an engine operating method includes adjusting exhaust valve timing of one or more cylinders of an engine in response to an indication that a gaspath actuator is stuck in position. In this way, pressure waves in an exhaust manifold and/or an intake manifold may be generated, which may act to unstick the gaspath actuator.

Methods and systems are provided for balancing a plurality of fuel injectors. In one example, a method includes determining a fuel injector error shape and applying a fueling correction to all injectors based on the fuel injector error shape.

Various methods and systems are provided for health assessments of a fuel system. In one example, a fuel system includes a high-pressure fuel pump operable to increase fuel pressure from a first pressure to a second pressure, a common fuel rail fluidly coupling the high-pressure fuel pump to a plurality of fuel injectors each of which is operable to inject fuel to individual cylinders of an engine, a pressure sensor operable to detect a pressure of fuel at the common fuel rail, and a controller operable to diagnose a condition of the high-pressure fuel pump based on output from the pressure sensor.

An ECM executes a catalyst early activation control at cold start of an engine such that the activation of a catalyzer is promoted by opening a WGV. Further, the ECM performs a diagnosis process of, during execution of the catalyst early activation control, repeating opening and closing of the WGV with a given period and diagnosing whether or not the WGV is stuck, based on whether or not a fluctuation component with the same period as the period of the opening and closing of the WGV is included in output from an intake manifold pressure sensor during the repetition.

The present disclosure relates to a method for detecting and distinguishing a cause of at least one combustion misfire of an internal combustion engine. The internal combustion engine has several cylinders, at least one exhaust gas tract, and an exhaust gas sensor which is arranged in the exhaust gas tract. The method includes the following steps: acquisition of a measurement signal with the exhaust gas sensor over a certain first period of time gas tract; subdivision of the measurement signal into measurement signal sections; assignment of the measurement signal sections to the corresponding cylinders, whereby cylinder-selective measurement signal profiles are produced that are characteristic of the respective oxygen content downstream of the respective cylinders over the determined first period of time of time; and evaluation of the cylinder-selective measurement signal profiles to detect at least one combustion misfire of the internal combustion engine.

A method of exercising a generator includes detecting a temperature of the generator by a temperature sensor, if the temperature of the generator is above a predetermined temperature, activating, by a controller, a starter motor of the generator, and performing, by the controller, an exercise test, and if the temperature of the generator is below the predetermined temperature, not activating, by the controller, the starter motor.