A method for controlling the total injection mass per working cycle during a multiple injection operation of a fuel injector of an internal combustion engine is provided. In the method, an injection mass difference is determined from individual injection pulse to individual injection pulse, and transferred to the next individual injection pulse, in stepwise fashion. The injection mass difference remaining in the penultimate individual injection pulse is transferred to the final individual injection pulse to achieve a total injection mass with improved tolerance.

A method for ascertaining a variable characterizing a flow rate of a fuel injector during an operation of an internal combustion engine, to which the fuel injector is assigned. At least two input values for a data-based model are ascertained, and at least one output value is determined with the aid of the data-based model, on the basis of which a value for the variable characterizing the flow rate of the fuel injector is ascertained. The data-based model combines at least two methods differing from one another for ascertaining a variable characterizing a flow rate of a fuel injector.

A method for operating an internal combustion engine, in particular of a motor vehicle, wherein fuel is injected in a fuel injection device in a plurality of time-spaced partial injections per duty cycle directly into a combustion chamber of the internal combustion engine.

The present invention provides a fuel injection control apparatus that can suppress variations in fuel injection amounts in a very small fuel injection region. For this purpose, the fuel injection control apparatus includes a fixed injection pulse generator 10 and a drive current interruption unit 31. The fixed injection pulse generator 10 generates a fixed injection pulse having a valve opening timing at which a drive current is supplied to an electromagnetic coil 19 in an electromagnetic fuel injection valve 18 and a first valve closing timing at which the drive current to the electromagnetic coil 19 is interrupted. Within a period in which the fixed injection pulse is generated, the drive current interruption unit 31 determines an electric energy amount of a drive current supplied to the electromagnetic coil in response to a valve opening timing of the fixed injection pulse. When this electric energy amount reaches a preset, predetermined target electrical energy amount, the drive current interruption unit generates a second valve closing timing of the fixed injection pulse different from the first valve closing timing and then interrupts the drive current supplied to the electromagnetic coil before the first valve closing timing.

The disclosure relates to a method for operating an internal combustion engine which has at least one injector and in which a correction of fuel injection quantity is implemented. For the correction of the fuel injection quantity, different properties of the injector in the ballistic working range thereof and in the linear working range thereof are evaluated. A total injection quantity of the injector demanded in an operating cycle is divided into a number of smaller, equal partial injection quantities implemented as partial pulses, and an evaluation of the pressure drops triggered by the partial pulses is performed in the correction of the fuel injection quantity. The disclosure furthermore relates to a device for operating an internal combustion engine which has at least one injector and in which a correction of the fuel injection quantity is implemented.

A fuel injection control device is applied to an internal combustion engine including a fuel injection valve and causes a valve body to be in a valve open state accompanying an energization of the fuel injection valve to inject fuel. The fuel injection control device acquires a dynamic parameter. The fuel injection control device acquires an injection amount parameter. The fuel injection control device calculates, based on the dynamic parameter, a dynamic correction value. The fuel injection control device calculates, based on the injection amount parameter, an injection amount correction value. The fuel injection control device corrects a fuel injection using the dynamic correction value and the injection amount correction value.

A fuel injection control device and a fuel injection control method for an internal combustion engine according to the present invention correct a basic pulse width by a cylinder-specific correction value that is based on injection variations among fuel injection valves to specify a cylinder-specific pulse width, determine whether or not a split number is acceptable based on a minimum pulse width and a pulse width per one injection calculated from the cylinder-specific pulse width and the split number to modify the split number based on a result of the acceptance determination, modify an acceptance determination reference value which is used in the acceptance determination based on the correction value for each cylinder, and execute split injection based on the split number, the basic pulse width, and the correction value for each cylinder.

In accordance with exemplary embodiments, methods and systems are provided for controlling fuel injection by a fuel injector of a direct injection engine. In one embodiment, a method includes: storing, in a first data storage device, a first table of values; storing, in a second data storage device, a second table of values; and adjusting, via instructions provided by a processor of the vehicle, a minimum mass value used to control the fuel injection based on an injector learned value, the first table, and the second table, wherein the injector learned value is set based on an amount of injector learning completed.

A method of controlling an engine system includes controlling a fuel injector to perform a zero-fueling injector operation during operation of the engine, the zero-fueling injector operation including a non-zero injector on-time resulting in zero fueling by the injector, determining an injection system pressure change associated with the zero-fueling injector operation, modifying at least one fuel injection control parameter in response to the injection system pressure change, and using the modified fuel injection control parameter to control injection of fuel by the fuel injector during operation of the engine.

A system, apparatus, and method for controlling an engine system can provide fuel reactivity compensation control for an engine of the engine system. Pilot fuel quantity supplied to the engine can be controlled using a nitrous oxide (NOx) error. Likewise, air-to-fuel ratio (AFR) for the engine can be controlled using the NOx error. Each of a pilot fuel offset and an AFR control trim can be generated using the NOx error. The pilot fuel offset and the AFR control trim can be used to control the pilot fuel quantity and the AFR, respectively.