Abstract: An adaptive fuel delivery control system includes a pressure monitoring module and a flow rate determination module. The pressure monitoring module determines an actual pressure drop after a fuel injection event on an injector. The flow rate determination module determines an adjusted flow rate based on a reference flow rate and the pressure drop.

Abstract: The instantaneous flow of an injector for gaseous fuels is calculated by measuring the pressure and temperature of a test gas injected inside a measuring chamber connected to the external environment in a continuous manner through a given outlet section and using a calculation formula, in which the instantaneous flow of the injector is a function of on the measured pressure, of a first factor as a function of a volume of the measuring chamber and the measured temperature, and of a second factor as a function of the measured temperature and the outlet section.

Abstract: A fuel injector for an internal combustion engine is provided. The fuel injector is equipped with a fuel pressure sensor, a sensor circuit such as an amplifier, and a valve actuator such as a piezoelectric actuator. The fuel injector also includes a conductive shield which is disposed between the sensor circuit and actuator drive terminals to supply electric power to the actuator and works to shield the sensor circuit from electric noises arising from the drive terminals, thereby minimizing the addition of the noises to an output of the fuel pressure sensor, as being processed in the sensor circuit, and ensuring the accuracy in determining the pressure of fuel based on the output of the fuel pressure sensor.

Abstract: A method for operating an injection valve, in particular a fuel injector of an internal combustion engine, in which a trigger voltage is able to be applied to an actuator, designed as piezoelectric element, of the fuel injector in order to induce an injection of fluid, in particular fuel, supplied to the fuel injector via a supply system. A specifiable test voltage is applied to the actuator in a test triggering, and a fluid pressure prevailing in the supply system is detected at least during the test triggering in order to derive information about an operating state of the fuel injector and/or the actuator from the test voltage and the detected fluid pressure.

Abstract: In a method for determining the rail pressure in a common rail system of an internal combustion engine, at least one measurement variable is determined which is a measure for the angular velocity of a crankshaft movement of the internal combustion engine, and the rail pressure is determined from said measurement variable or from a variable derived from the measurement variable. Furthermore disclosed are methods that are based thereon for controlling an injection quantity and for controlling a rail pressure, and a corresponding common rail injection system.

Abstract: To reliably detect, without adding new parts, injection abnormality not only when fuel injection is not performed but also including fuel injection in a state where the injection quantity has fallen abnormally low.

Abstract: Disclosed is both an apparatus and method for quantifying an injection event of a fuel injector, including both multiple pulse and single pulse injection events. Typically, the fuel injector is a common rail injector. The apparatus includes a pressure chamber for isolating a portion of the injection pressure for reducing pressure waves and reflections which can create “noise” in the detection of an injection pressure. The invention further includes determining the precise start and end times of injection using cavitation created by the injection event.

Abstract: The present disclosure is directed towards a clamping assembly for compressing a plurality of optical plates of a high pressure cavitation system. The clamping assembly may include a mounting frame and a housing coupled to the mounting frame. The clamping assembly may further include a holder distal the housing, the holder having the plurality of optical plates disposed therein. The clamping assembly further including a controllable clamping mechanism operably coupled to a top of the housing, the controllable clamping mechanism applying an axial force to the plurality of optical plate.

Abstract: A method and a device for controlling a fuel metering system are described. The fuel metering system includes at least one injector for injecting fuel into an internal combustion engine. An electric current value is applied to the at least one injector, and a rail pressure value is determined based on the electric current value.

Abstract: A method for determining fuel injection pressure or detecting a discrepancy in the fuel injection process of an internal combustion engine is provided. The engine includes a camshaft that actuates at least one fuel injector of the engine's fuel injection equipment. The method includes the step of determining a value T that is representative of the torque generated on the camshaft, such as the instantaneous torque or rotational speed of the camshaft, the torque being a resultant of accelerating and decelerating forces exerted on the camshaft by the at least one fuel injector during a phase of operation of the internal combustion engine. The method also includes the step of monitoring the value T for any increment, decrement or irregularity.

Abstract: A fuel state sensing device is applied to an injector injecting fuel, which is supplied from a fuel pump, though an injection hole. The fuel state sensing device has a fuel pressure sensor (bulk modulus sensing section) for sensing a bulk modulus of the fuel existing in a fuel passage extending from a discharge port of the fuel pump to the injection hole. The fuel state sensing device has a fuel temperature sensor (fuel temperature sensing section) for sensing fuel temperature. The fuel state sensing device has an air mixing state calculating section for calculating a quantity or a ratio of air mixing in the fuel as an air mixing quantity or an air mixing ratio based on the sensed bulk modulus and the sensed fuel temperature.

Abstract: In a method for determining a vibration-optimised adjustment of an injection device of an internal combustion engine, for each cycle of the internal combustion engine, a plurality of individual injections per cylinder is carried out by the injection device, each of which is defined by a relative injection moment and an individual injection quantity. A temporal course of a resulting pressure influenced by pressure waves is determined in a fuel guiding part, and the above-mentioned adjustment is determined by variation of the injection moment of at least one individual injection and/or the individual quantity, such that the adjustment is characterised by a temporal variation of the resulting pressure, which is reduced by an at least partially destructive interference between the cited pressure waves. A corresponding device can determine a vibration-optimised adjustment of an injection device, and an internal combustion engine may have such a device.

Abstract: A detecting device for a fuel injector includes a sensor unit and an ECU. The sensor unit is provided with a fuel pressure detection circuit which outputs a pressure detection signal in response to a fuel pressure. The ECU computes the fuel pressure based on a voltage value of the pressure detection signal relative to a reference voltage. The ECU obtains a comparative voltage according to an applied-voltage to the fuel pressure detection circuit and computes a deviation between the comparative voltage and the reference voltage. The sensor unit adjusts the applied-voltage in such a manner as to decrease the deviation. Thus, the computation accuracy of the fuel pressure is improved.

Abstract: A gaseous fuel injector 3 supplies gaseous fuel from a compressed gas cylinder 1 into a measuring portion thin tube 5 and pressure change in the tube is measured by a pressure measuring device 4 through a small hole provided in the thin tube 5. An extension thin tube 6 for removing the influence of reflected waves is provided on the downstream side of the measuring portion thin tube 5. There is provided at the downstream side end of the extension thin tube a back pressure valve 13 for uniformly increasing the pressure in the tube and for bringing the pressure close to the actual environment in the engine cylinder. Also, a tapered-shape nozzle is arranged in the measuring portion thin tube 5. Pressure measured by the pressure measuring device 4 is transduced into mass flow rate in the thin tube according to a predetermined calculation formula. Accordingly, it is possible to measure instantaneous mass flow rate of gaseous fuel injected from the gaseous fuel injector.

Abstract: A method for checking the output signal of a rail pressure sensor of a direct-injecting internal combustion engine having a common rail system for plausibility, including the following steps: the output signal of the rail pressure sensor is detected over a predefinable period of time and recorded; the output signal is transformed into the frequency space; characteristic features are extracted from the transformed signal; a rail pressure value is calculated on the basis of the features and additional, predefined influencing variables; an average rail pressure value is simultaneously ascertained from the output signal of the rail pressure sensor; the average rail pressure value is compared with the calculated rail pressure value; in the event that the calculated rail pressure value deviates from the average rail pressure value by a predefined limiting value, an error signal is output and/or stored in an error memory.

Abstract: An injector includes a nozzle hole, a metal body including a high pressure passage inside the body, and a fuel pressure sensor attached to the body to detect fuel pressure. The sensor includes a metal flexure element resiliently deformed upon application of fuel pressure to the flexure element, and a sensor element that converts flexure in the flexure element into an electrical signal and outputs the signal as a pressure detection value. The body includes a sensor high pressure passage communicating with the flexure element, and a body side sealing surface on which the flexure element is pressed and closely-attached so that a clearance between the body and the flexure element is metal-to-metal sealed on the sealing surface. Carburizing treatment is performed on at least a part of the body that defines the sensor high pressure passage. The carburizing treatment is not performed on the sealing surface.

Abstract: In a method for diagnosing an injection valve (5), in an overrun fuel cut-off phase the fuel supply to the fuel rail (4) is closed, and after the fuel supply has been closed off a first fuel pressure in the fuel rail (4) is measured, and after the first measurement of the fuel pressure an injection valve (5) is actuated for a test injection. After the test injection a second fuel pressure in the fuel rail (4) is measured, a differential pressure value (?P) is formed from the first and second measured fuel pressures and a difference of an operating parameter from a reference parameter is determined from the differential pressure value (?P), and when a previously defined maximum difference is exceeded the injection valve (5) is detected as being defective.

Abstract: A fuel control system for an engine includes a control module that includes a fuel rail pressure module and a comparison module. The fuel rail pressure module determines a first fuel rail pressure of a fuel rail after a first event and a second fuel rail pressure of the fuel rail after a second event. The first event includes N conditions, a first of the N conditions comprises deactivation of a fuel pump of the engine, and N is an integer. The second event includes M conditions, a first of the M conditions comprises activation of a fuel injector, and M is an integer. The comparison module adjusts a fuel injector constant of the fuel injector based on the first fuel rail pressure, the second fuel rail pressure, and an injector activation period corresponding to the second event.

Abstract: In order to compensate for pressure drop across a fuel injector, pressure in a combustion chamber of an internal combustion engine into which fuel is injected is estimated based on manifold pressure at a timing for intake valve closure and volumes of the combustion chamber at a timing for intake valve closure and at least one other timing.

Abstract: When change of fuel pressure sensed with a fuel pressure sensor is small, it is temporarily determined that the fuel pressure sensor is abnormal. After the abnormality is temporarily determined, transfer quantity from a high-pressure fuel supply pump is increased and pressure reduction is performed by driving a pressure reducing valve, thereby increasing the change of the fuel pressure of a common rail. When the change of the fuel pressure sensed with the fuel pressure sensor is small thereafter, it is formally determined that the fuel pressure sensor is abnormal. Thus, a pressure accumulation fuel injection device can appropriately perform abnormality detection of the fuel pressure sensor, irrespective of existence/nonexistence of fuel leak from an injector.

Abstract: A fuel injection device includes a fuel injection valve for injecting fuel, which is distributed from a pressure-accumulation vessel. A pressure sensor is located in a fuel passage, which extends from the pressure-accumulation vessel to a nozzle hole, and configured to detect pressure of the fuel. The pressure sensor is located closer to the nozzle hole than the pressure-accumulation vessel. A storage unit stores individual difference information, which indicates an injection characteristic of the fuel injection valve, the injection characteristic being obtained by an examination. The individual difference information is related to a fluctuation pattern of a portion of the fluctuation in detected pressure waveform of the pressure sensor. The fluctuation is attributed to one fuel injection through the nozzle hole. The portion of the fluctuation is subsequent to an end of the fuel injection.

Abstract: A fuel injector diagnostic system includes a fuel pump control module, a pressure sensor, and a diagnostic module. The fuel pump control module disables delivery of fuel to a fuel rail of an engine. The pressure sensor measures a first pressure of the fuel rail before an injection event and a second pressure of the fuel rail after the injection event on at least one of a plurality of injectors when the engine is running. The diagnostic module diagnoses a fault in the at least one of the injectors based on the first pressure and the second pressure.

Abstract: In a method for determining a controlled variable of pressure control of a high-pressure accumulator of an injection system, a setpoint pressure gradient value is determined in the high-pressure accumulator as a function of the maximum possible actual pressure gradient value.

Abstract: A method for determining a deviation of a fuel quality from a reference quality and for determining a change in exhaust gas emissions caused by this deviation by evaluating pressure waves in a fuel system of an internal combustion engine outfitted with one of a discontinuous fuel delivery and a fuel take-off.

Abstract: The instantaneous flow of an injector for gaseous fuels is calculated by measuring the pressure and temperature of a test gas injected inside a measuring chamber connected to the external environment in a continuous manner through a given outlet section and using a calculation formula, in which the instantaneous flow of the injector is a function of on the measured pressure, of a first factor as a function of a volume of the measuring chamber and the measured temperature, and of a second factor as a function of the measured temperature and the outlet section.

Abstract: A method for checking a pressure sensor of a fuel injection system, especially of a motor vehicle, the fuel injector system having a pressure reservoir to which the pressure sensor and an injector are assigned; in the method, a fuel quantity being injected under a pressure by the injector, wherein a pressure difference, which is created by a sudden pressure drop caused by the injection process, is ascertained as a function of the pressure and the fuel quantity.

Abstract: A fuel injector which may be employed in injecting fuel into an internal combustion engine. The fuel injector includes an injector body and a head body formed to be separate from the injector body. The head body has installed therein a fuel pressure sensor working to measure the pressure of fuel in the fuel injector and is joined detachably to the injector body. The fuel injector alternatively includes an injector body and a fuel pressure-sensing unit equipped with a fuel pressure sensor. The fuel pressure-sensing unit is installed detachably on the injector body. This structure provides enhanced productivity of the fuel injector and facilitate the ease of replacement of the fuel pressure sensor.

Abstract: In a method for testing the operation of a pressure sensing unit of an injection system of an internal combustion engine, the injection system has no high-pressure valve. An error is detected when a pressure gradient value falls below a pressure gradient limit while at the same time the most recently detected pressure is higher than a pressure limit.

Abstract: A fuel injector comprising an injector body, a capnut, and a pressure sensor exposed to pressure changes in a combustion chamber in use, wherein the pressure sensor is accommodated within the capnut. Optionally, the fuel injector further comprises a signal cable external to the injector body to connect with the pressure sensor.

Abstract: The present disclosure is directed towards a clamping assembly for compressing a plurality of optical plates of a high pressure cavitation system. The clamping assembly may include a mounting frame and a housing coupled to the mounting frame. The clamping assembly may further include a holder distal the housing, the holder having the plurality of optical plates disposed therein. The clamping assembly further including a controllable clamping mechanism operably coupled to a top of the housing, the controllable clamping mechanism applying an axial force to the plurality of optical plate.

Abstract: Disclosed is both an apparatus and method for quantifying an injection event of a fuel injector, including both multiple pulse and single pulse injection events. Typically, the fuel injector is a common rail injector. The apparatus includes a pressure chamber for isolating a portion of the injection pressure for reducing pressure waves and reflections which can create “noise” in the detection of an injection pressure. The invention further includes determining the precise start and end times of injection using cavitation created by the injection event by determining the intensity of light within a spray chamber.

Abstract: A system for regenerating a catalytic particulate filter located in a diesel engine exhaust line, including an electronic control unit, a controlled fuel injector arranged upstream of the catalytic particulate filter and supplied with fuel by a controlled pump, and a sensor for measuring the fuel feeding pressure of the injector. Further, a detection mechanism detects an open position locking of the injector based on the fuel feeding pressure of the injector.

Abstract: A method of testdiagnosing the operation of each of a plurality of fuel injectors of an internal combustion engine system includes inhibiting ignition of the engine, monitoring a fuel pressure within a fuel rail of the engine and pulsing a fuel injector of the plurality of fuel injectors of the engine. Whether the fuel pressure has stabilized is determined and a pressure differential is calculated based on a pre-pulse fuel pressure and a post-pulse fuel pressure when the fuel pressure has stabilized. A technician determines whether the fuel injector is operating properly based on the pressure differential.

Abstract: A system and method are provided for determining an ethanol content of a fuel that is part of a fuel and air mixture combusted within an internal combustion engine. A pressure characteristic of a fuel rail is monitored during operation of the engine. At least one of an effective bulk modulus of the fuel and a pressure perturbation signature is determined based on the pressure characteristic. The ethanol content is determined based on the at least one of the effective bulk modulus and the pressure perturbation signature.

Abstract: A pressure sensor is located in a fuel passage, which extends from a pressure-accumulation vessel to a nozzle hole of a fuel injection valve. The pressure sensor is located closer to a nozzle hole than the pressure-accumulation vessel for detecting pressure fluctuated by injection of fuel through the nozzle hole. An instruction signal output unit outputs an injection instruction signal so as to instruct an injection mode of fuel to the fuel injection valve. A defective injection determination unit determines whether a detected pressure of the fuel pressure sensor is fluctuated in a fluctuation mode in a range assumed from the injection instruction signal. The defective injection determination unit determines that a defective injection occurs when determining that the detected pressure is out of the fluctuation mode in the assumed range.

Abstract: A method of testdiagnosing the operation of each of a plurality of fuel injectors of an internal combustion engine system includes inhibiting ignition of the engine, monitoring a fuel pressure within a fuel rail of the engine and pulsing a fuel injector of the plurality of fuel injectors of the engine. Whether the fuel pressure has stabilized is determined and a pressure differential is calculated based on a pre-pulse fuel pressure and a post-pulse fuel pressure when the fuel pressure has stabilized. A technician determines whether the fuel injector is operating properly based on the pressure differential.

Abstract: A method for determining fuel injection pressure or detecting a discrepancy in the fuel injection process of an internal combustion engine is provided. The engine includes a camshaft that actuates at least one fuel injector of the engine's fuel injection equipment. The method includes the step of determining a value T that is representative of the torque generated on the camshaft, such as the instantaneous torque or rotational speed of the camshaft, the torque being a resultant of accelerating and decelerating forces exerted on the camshaft by the at least one fuel injector during a phase of operation of the internal combustion engine. The method also includes the step of monitoring the value T for any increment, decrement or irregularity.