Disclosed is an injector controlling method using an opening duration. The injector controlling method using an opening duration converts a target fuel quantity into an opening duration and sets relationship between the opening duration and an injector actuation signal in order to control the fuel quantity of injectors more accurately.

The objective of the present invention is to provide an engine with improved startability and stable operation regardless of the driving environment and usage conditions. The engine is equipped with a control means, which calculates a standard injection timing on the basis of the target rotational frequency of the engine and a standard injection amount, that is, the amount of fuel injected, and which corrects the standard injection timing using at least one correction amount. A fuel injection control unit calculates a cooling water correction amount on the basis of the target rotational frequency of the engine, the standard injection amount, and the cooling water temperature, and when the cooling water temperature is less than a first prescribed temperature the control unit corrects the standard injection timing using only the cooling water correction amount.

A fuel injection apparatus includes: a first obtaining unit that obtains a first index relating to an opening behavior of an injector; a second obtaining unit that obtains at least one of a second index relating to a maximum injection rate of the injector and a third index relating to an injection period; and a calculation unit that determines that injection hole corrosion has occurred in the injector when a first condition relating to the first index is established and at least one of a second condition relating to the second index and a third condition relating to the third index is established.

Systems and methods for determining fuel delay in a fuel injected engine with cylinders that may be deactivated are presented. In one example, the fuel injection delay is determined via a cylinder firing schedule array when the cylinder firing schedule array is available. The fuel injection delay is determined via weighted average of a fuel injection delay of a present engine cycle and a fuel injection delay of a past engine cycle when the cylinder firing schedule array is not available.

A method for the injector-specific diagnosis of a fuel injection device of an internal combustion engine, including the following steps: detecting a pressure progression in an individual accumulator of an injector in a time-resolved manner; evaluating the detected pressure progression; determining if there is a fault state of the injection device in the region of the injector on the basis of the detected and evaluated pressure progression; and identifying the fault state on the basis of the detected and evaluated pressure progression.

A method is described for controlling the metering of fuel. A feature, which characterizes the switching point in time of a valve, is ascertained based on a measured signal curve. The feature is fed as an actual variable to a controller. A criterion of the feature is ascertained, the controller taking the criterion of the feature into account.

Operating an engine includes injecting one or more early pilot shots of a liquid fuel containing methanol (MeOH) into a cylinder in an engine, and moving a piston in the cylinder from a bottom-dead center position toward a top-dead center position. Operating an engine further includes forming hydrogen peroxide (H2O2) in the cylinder from the MeOH of the early pilot shots, injecting a main shot of a liquid fuel into the cylinder, and hastening combustion of the liquid fuel of the main shot in the cylinder via hydroxyl (OH) radicals formed from dissociation of the H2O2. Injection of the one or more early pilot shots at appropriate crank angle timing(s) associated with suitable temperature ranges may promote desired reaction pathways according to a medium temperature combustion regime.

A delay module, based on a base request received for a first loop, sets a delayed base request for a second loop. A first period between the first and second loops corresponds to: a first delay period of an oxygen sensor; and a second delay period for exhaust to flow from a cylinder of an engine to the oxygen sensor. A closed loop module determines a closed loop correction for the second loop based on: the delayed base request for the second loop; a measurement from the oxygen sensor; the closed loop correction for the first loop; and the closed loop correction for a third loop. A second period between the second and third loops corresponds to the first delay period of the oxygen sensor. A summer module sets a final request for the second loop based on the base request plus the closed loop correction for the second loop.

A method of controlling fuel injection in an internal combustion engine having at least one cylinder with an associated fuel injector for performing injector events, wherein for each injector event a drive signal is generated to cause an opening of the fuel injector to spray fuel in accordance with a demand fuel quantity. In a drive mode, the drive signal has a length, PWf, that corresponds to a reference length, PWref, determined from a reference map, MAP-PWref, of demand fuel quantity vs. pulse length, and corrected by a correction value, PWcorr. PWcorr is determined based on a map, MAP-PWcorr, depending on demand fuel quantity, the map MAP-PWcorr being learned during engine runtime and representing a difference between a learned, injector-specific hydraulic open time and a reference hydraulic open time.

Operating a fuel injector in a fuel system for an engine includes energizing a first solenoid actuator to move a spill valve from a first position to a second, closed position, and energizing a second solenoid actuator to move a fuel injection valve in the fuel injector from a closed position to an open position. A pull-in tier of a waveform energizing the second solenoid actuator is generated via a first current produced by a boosted voltage power supply and a second current produced by a lower voltage power supply. Arrival timing of the valve at the open position is detected based on a property of the second current, such that a valve arrival timing error may be used to trim the fuel injector. Related methodology and control logic is also disclosed.