Abstract: Systems and methods for improving fuel injection of an engine that includes a cylinder receiving fuel from two different fuel injectors is disclosed. In one example, a transfer function or gain of a direct fuel injector is adjusted in response to an exhaust lambda value and a fraction of fuel supplied to a cylinder during a cylinder cycle.

Abstract: Systems and methods for improving fuel injection of an engine that includes a cylinder receiving fuel from a direct fuel injector are disclosed. In one example, a transfer function or gain of a direct fuel injector is adjusted in response to an exhaust lambda value and a first pulse width of two pulse widths provided to an injector of a cylinder during a cylinder cycle.

Abstract: Systems and methods for improving fuel injection of an engine that includes a cylinder receiving fuel from two different fuel injectors is disclosed. In one example, fueling errors for each of the two fuel injectors are determined based on fractions of fuel supplied by the two fuel injectors during different engine operating conditions.

Abstract: Various systems and methods are described for calibrating a port injector of a common fuel, dual injector per cylinder engine which includes first and second fuel rails and first and second fuel pumps. In one example, after pressurizing both fuel rails and suspending operation of the two pumps simultaneously, a single cylinder is fueled by a port injector while the remaining cylinders are fueled via their respective direct injectors. Fuel rail pressure drops are measured in the rail coupled to the port injector and correlated to port injector performance.

Abstract: Methods and systems are described for controlling fuel injection in an engine equipped with a dual injector system including a port injector and a direct injector. A ratio of port injected fuel to direct injected fuel is adjusted based at least on intake valve temperature. The proportion of fuel port injected into a cylinder is increased as the intake valve temperature for the given cylinder increases to improve fuel vaporization in the intake port.

Abstract: Various systems and methods are described for calibrating a port injector of a common fuel, dual injector per cylinder engine which includes first and second fuel rails and first and second fuel pumps. In one example, after pressurizing both fuel rails and suspending operation of the two pumps simultaneously, a single cylinder is fueled by a port injector while the remaining cylinders are fueled via their respective direct injectors. Fuel rail pressure drops are measured in the rail coupled to the port injector and correlated to port injector performance.

Abstract: A method and system for improving starting of an engine is presented. In one example, the method selects a first cylinder to receive fuel since engine stop the cylinder's position relative to the cylinder's top-dead-center compression stroke. The method also describes adjusting a number of fuel injections for a first combustion event since engine stop.

Abstract: Methods and systems are provided for restarting an engine when a high pressure fuel pump is degraded. In response to an indication of high pressure fuel pump degradation, fuel may be injected during an intake stroke, rather than a compression stroke, for a selected number of combustion events since the engine restart. By shifting to an intake stroke injection, the engine may be started even when sufficient fuel rail pressures are not available.

Abstract: A method for controlling an internal combustion engine based on the amount of un-burned fuel dissolved in the engine oil, and returned into the manifold through the PCV valve as the engine oil temperature rises via adjusting fuel injection into a cylinder from a fuel injector, in a fuel delivery system. The fuel dilution in engine oil and the amount of fuel entering the intake manifold through the PCV valve can be determined based on one or more of oil volume, fuel composition (e.g., ethanol content), oil temperature, engine temperature, engine speed, engine load, engine run time, injected fuel mass, and exhaust gas composition.

Abstract: Methods and systems are provided for restarting an engine when a high pressure fuel pump is degraded. In response to an indication of high pressure fuel pump degradation, fuel may be injected during an intake stroke, rather than a compression stroke, for a selected number of combustion events since the engine restart. By shifting to an intake stroke injection, the engine may be started even when sufficient fuel rail pressures are not available.

Abstract: A method for starting an internal combustion engine, the method comprising identifying cylinder stroke during the engine start responsive to a fuel rail pressure.

Abstract: Methods and systems are provided for restarting an engine when a high pressure fuel pump is degraded. In response to an indication of high pressure fuel pump degradation, fuel may be injected during an intake stroke, rather than a compression stroke, for a selected number of combustion events since the engine restart. By shifting to an intake stroke injection, the engine may be started even when sufficient fuel rail pressures are not available.

Abstract: A method for controlling a mechanical solenoid valve of a high-pressure fuel pump to supply fuel to an engine is provided. In one example, current supplied to the mechanical solenoid valve is adjusted according to a pressure downstream of the fuel pump. The method can reduce current used to operate the mechanical solenoid valve as well as pump noise, at least during some conditions.

Abstract: A method for controlling a mechanical solenoid valve of a high-pressure fuel pump to supply fuel to an engine is provided. In one example, current supplied to the mechanical solenoid valve is adjusted according to a pressure downstream of the fuel pump. The method can reduce current used to operate the mechanical solenoid valve as well as pump noise, at least during some conditions.

Abstract: A method for controlling a mechanical solenoid valve of a high-pressure fuel pump to supply fuel to an engine is provided. In one example, current supplied to the mechanical solenoid valve is adjusted according to a pressure downstream of the fuel pump. The method can reduce current used to operate the mechanical solenoid valve as well as pump noise, at least during some conditions includes.

Abstract: A method for controlling fuel injection timing of at least one fuel injector in a direct injection fuel delivery system of an internal combustion engine is presented. In one example, the timing of a second fuel pulse in a combustion cycle is adjusted in response to injector needle position bounce. The method can improve fuel delivery control.

Abstract: A method for controlling an injection of fuel to an engine is described. In one example, the different fuels are injected to an engine during different engine operating conditions. The method may improve engine starting and reduce engine emissions.

Abstract: An engine system and a method of starting an internal combustion engine of the engine system are described. In one embodiment, the method includes adjusting a fuel pressure within a fuel rail to exceed a pressure of a pressure relief valve. The method may be particularly useful during degradation of a fuel pressure sensor.

Abstract: A method for controlling an injection of fuel to an engine is described. In one example, the different fuels are injected to an engine during different engine operating conditions. The method may improve engine starting and reduce engine emissions.

Abstract: A method for controlling a mechanical solenoid valve of a high-pressure fuel pump to supply fuel to an engine is provided. The method includes: during an idle condition, adjusting a pull-in current of the mechanical solenoid valve utilized to control closing of the mechanical solenoid valve based on a fuel pressure downstream of the high-pressure fuel pump, wherein the pull-in current is reduced when possible while enabling the mechanical solenoid valve to close as indicated by an increase in the downstream fuel pressure.