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 connector for mounting a sensor such as a pressure sensor in a fuel system includes a connector body and a tube body. The tube body has sealing surfaces at opposite axial ends that are structured to bias rotation of the connector body and the tube body to occur relative to one another rather than the connector body causing the tube body to rotate against a housing of a fluid reservoir in the system. Deformation of the housing is limited by way of the biasing of rotation.

A connection structure for a fuel pressure sensor that connects a fuel pressure sensor for detecting a pressure of a fuel to a fuel rail in which the fuel to be supplied to an internal-combustion engine flows, includes a tubular attachment boss that is formed in the fuel rail and includes a male screw portion and an abutting surface, an attachment portion that is provided in a sensor body of the fuel pressure sensor, and includes a contact surface that abuts to the abutting surface and a bearing surface provided behind the contact surface, and a nut including a female screw portion that is screwed on the male screw portion and a pressing portion that presses the bearing surface to the abutting surface by screwing the female screw portion on the male screw portion.

A fuel system cover is provided for an internal combustion engine. The fuel system cover is configured to be mounted on the cylinder head assembly to encapsulate a portion of the fuel system to provide leak prevention, mitigation, and detection capabilities.

A fuel injection control apparatus is provided with a first valve opening timing determination portion that determines a first valve opening timing on the basis of a collision signal that is included in detected signals of an in-cylinder pressure sensor and indicates a collision between a movable core and a valve element and a second valve opening timing determination portion that determines a second valve opening timing on the basis of another collision signal that is included in the detected signals and indicates a collision between the movable core and a stationary core.

An integrated fuel water separator filter system is provided. The fuel water separator filter may include a plurality of fuel water separator filters, with at least one fuel water separator filter including electronic sensors to monitor the life of the fuel water separator filter and the amount of water present in the fuel water separator filter. A heater heats the fuel in the fuel water separator filter.

When fuel injections into Otto-engines are carried out, pressure pulsations occur in the entire fuel injection system. These prevent detailed information about the fuel injection to be deduced from the pressure signals measurable in the system. When specially designed dampers for these pressure pulsations are employed, pressure difference signals over the pulsation damper can readily be employed for instantaneous volume flow rate measurements. Furthermore, the inserted pressure pulsation dampers also allow the pressure reduction in the Common-Rail, due to the fuel injections, to be employed to measure the instantaneous fuel injection volume flow rates, in running Otto-engines. The authors' development work in this field is described in this paper and results of verification measurements are presented.

A fuel injector interface device and associated method include an interface device having a plurality of input leads and a plurality of output leads. The input leads are communicatively linked to the fuel pressure sensor on the common rail of a vehicle fuel injection system. The output leads are communicatively linked to a display device such as a diagnostic scope. Circuitry positioned within the interface device detects the rail pressure signals, filters the signals, and outputs data to the display device representing a graphical depiction of the same. A method of using the interface device includes generating the signals, mapping the signals to an individual fuel injector of the vehicle's engine cylinder and determining fluctuations in the strength of the displayed signals to determine anomalies in a particular fuel injector.

A distributor apparatus of a common rail system for an internal combustion engine. The distributor apparatus is designed with at least one distributor device having a high-pressure line for fuel and a plurality of feed lines branching off from the high-pressure line within the distributor device. Each feed line leads to an individual accumulator and an injector. The feed line is associated with a restriction device and a discharge bore, which is designed to cooperate with a pressure-measuring device and which is arranged downstream of the restriction device, such that the restriction device is arranged in the feed line and the discharge bore, arranged in the distributor device, is connected to the feed line downstream of the restriction device.