The present invention relates to an injector for injecting fuel, comprising an injector housing, a movable nozzle needle which is arranged in the injector housing and has a nozzle needle tip, a nozzle needle seat for receiving the nozzle needle tip, and a mechanical switch which upon contact of the nozzle needle tip with the nozzle needle seat assumes a closed state and upon interruption of the contact assumes an open state, wherein the injector is provided with an input line and an output line for actuating a movement of the nozzle needle, and the switch includes a first terminal and a second terminal. The injector is characterized in that the first terminal of the switch is connected to the input line and the second terminal of the switch is connected to the injector housing.

A characteristic determining device is provided which determines fuel injection characteristics of a plurality of fuel injectors for an internal combustion engine. The characteristic determining device includes a pressure sensor and a plurality of pipes each of which connects between the pressure sensor and one of the fuel injectors. The pressure sensor is designed to have a plurality of pressure inputs from the respective fuel injectors through the pipes and outputs a signal indicative of a level of pressure in each of the fuel injectors. The characteristic determining device analyzes the signals from the first pressure sensor to determine the fuel injection characteristics of the respective fuel injectors. These arrangements result in a simplified structure of the characteristic determining device and a decreased manufacturing cost thereof.

A characteristic determining device is provided which determines fuel injection characteristics of a plurality of fuel injectors for an internal combustion engine. The characteristic determining device includes a pressure sensor and a plurality of pipes each of which connects between the pressure sensor and one of the fuel injectors. The pressure sensor is designed to have a plurality of pressure inputs from the respective fuel injectors through the pipes and outputs a signal indicative of a level of pressure in each of the fuel injectors. The characteristic determining device analyzes the signals from the first pressure sensor to determine the fuel injection characteristics of the respective fuel injectors. These arrangements result in a simplified structure of the characteristic determining device and a decreased manufacturing cost thereof.

A fuel injector testing machine is provided. The machine includes a head unit having a flow meter, and a fuel injector holding assembly. The head unit and/or the fuel injector holding assembly can be moved relative to each other, allowing the head unit to test a subset of fuel injectors held on the fuel injector holding assembly, and subsequently can test another subset of the fuel injectors via movement of the head unit and/or fuel injector holding assembly.

A fuel injector testing machine is provided. The machine includes a head unit having a flow meter, and a fuel injector holding assembly. The head unit and/or the fuel injector holding assembly can be moved relative to each other, allowing the head unit to test a subset of fuel injectors held on the fuel injector holding assembly, and subsequently can test another subset of the fuel injectors via movement of the head unit and/or fuel injector holding assembly.

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.

An injection control device includes an injector and a detection unit. The injector includes: an injection hole; a movable part; a seat portion; a valve housing; a magnetic field application unit; and a detection sensor. The movable part opens and closes the injection hole by reciprocal movement. The seat portion when seated by the movable part closes the injection hole, and when the movable part lifted therefrom opens the injection hole. The valve housing accommodates the movable part in a reciprocally movable manner. The magnetic field application unit is installed on an outer circumference of the valve housing and applies a magnetic field to the movable part and the valve housing. The detection sensor outputs a detection signal according to a size of a distance between the valve housing and the movable part.

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 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 pump health assessment system and a method for providing a pump health of a pump is disclosed. The method includes: determining that there is an imbalance in the pump; increasing pump flow from the pump; measuring a rail pressure of a fuel rail; determining if the rail pressure is substantially equal to an expected rail pressure profile; and in accordance with a determination that the rail pressure is not substantially equal to the rail pressure profile, outputting an indication of pump damage.