Siemens Aktiengesellschaft

Continental Automotive Gmbh

Siemens Aktiengesell Schaft

Vdo Automotive Ag

Dirk Baranowski

Gerd Schmutzler

Erwin Achleitner

Christian Hoffmann

Richard Pirkl

Wendelin Klügl

Thorsten Lauer

Stefan Lehmann

Joachim Wagner

Raimondo Giavi

Wendelin Kl&uuml;gl

Klaus Hengl-Betz

Karl Kirchweger

Johannes Fitzner

Franz Kunz

Hellmut Freudenberg

Paul Rodatz

Christian Birkner

G&uuml;nter Lewentz

Carlos Eduardo Migueis

Christian Borgmann

Lorand D'Ouvenou

Wolfgang Lingl

Hinrich Kr&uuml;ger

J&uuml;rgen Rink

Jurgen Rink

Hinrich Krueger

Michael Von Dirke

Wolfgang Bock

In a method for determining a control parameter for a fuel injector of an internal combustion engine, the problem of enabling more precise determination of the control parameter, even if the fuel pressure (FUP) present on the fuel injector varies, is solved in that the fuel pressure (FUP) present on the fuel injector during the injection (I, I, I', I&#x2033;) is concluded while allowing for the time of the fuel pressure value detection and/or the crankshaft angle position of the internal combustion engine during the detection of the fuel pressure value, and that the control parameter is determined based on the fuel pressure (FUP) that was concluded.

Method and device for determining a control parameter for a fuel injector of an internal combustion engine

In a method and a device for operating an injection valve, a relevant time (t_ACT) is determined during a catch phase (PH_CATCH) when the electromagnetic actuator reaches a predetermined fraction value of the electric current, which value is smaller than a maximum current value, and a fraction of interval (T_FRAC) since the start of the respective catch phase (PH_CATCH) is determined depending thereon and the injection valve is diagnosed depending on the fraction of interval (T_FRAC) and the predetermined minimum and maximum threshold interval values (THD_T_MIN, THD_T_MAX).

Method and device for operating an injection valve

An injection valve has a magnetic actuator and an injector needle able to be moved axially by the magnetic actuator. To meter a fluid by the injection valve the magnetic actuator is activated for an individual metering process with at least one actuation signal with a first or second signal waveform. The two actuation signals differ from one another in that, on activation of the magnetic actuator by the actuation signal with the first signal waveform, less energy is transmitted to a magnet unit of the magnetic actuator than during activation of the magnetic actuator by the actuation signal with the second signal waveform. The magnetic actuator is activated by the actuation signal with the second signal waveform if an activation of the magnetic actuator by the actuation signal with the first signal waveform leads to an undesired premature closure of the injector needle.

Method and device for metering a fluid

In a first operating state, the fuel metering of one of the cylinders is controlled in first metering pulses with the same pulse characteristic during a respective one working cycle, and the metering of fuel into the other cylinders by at least one second metering pulse with a different pulse characteristic. The first pulse number and characteristic is predefined such that the same fuel mass should be metered based on an assumed injection valve characteristic as with the one second metering pulse. Depending on the measurement signal, a correction value for the one cylinder is determined. To meter the fuel based on the assumed injection valve characteristic, a single first metering pulse would be generated during a respective one working cycle. The correction value for the one cylinder is used during the rest of the operation to adapt the first metering pulse in the second operating state.

Method and device for operating an internal combustion engine

The invention relates to an injection valve, comprising a control chamber () with a control piston () that is functionally linked with a nozzle needle (). The control chamber () is linked, via an inlet throttle (), with pressurized fuel, and with an outlet throttle () with a valve chamber (). A servo valve () is disposed in the valve chamber (), said servo valve opening a connection between the valve chamber () and a return element () depending on its position. The inventive injection valve further comprises a bypass throttle () that is interposed between the fuel feed line and the valve chamber.

Injection valve having a bypass throttle

A first energy control unit has a pilot controller with an applied setpoint energy and outputs a pilot control signal, and a regulator outputting a regulator signal as a function of the setpoint energy and an actual energy of the piezo actuator. The energy control unit creates a control signal representative for a current threshold of a charge current, depending on the pilot control and regulator signals. Furthermore, there is a second energy control unit for another setpoint energy and another control signal. A power output stage sets a charge current for the piezo actuator as a function of the predetermined control signal and performs this for the predetermined time. A scheduling unit predetermines, for setting the setpoint energy, the control signal and the time to the power output stage, and for setting the another setpoint energy, the another control signal and the time to the another power output stage.

Device for operating a piezo actuator

A high pressure injection system comprises at least one fuel high pressure accumulator, a control chamber and a valve, in addition to an injection valve having a valve needle and a control piston. The control chamber is connected to the high pressure accumulator by means of an inlet throttle and to the valve by means of an outlet throttle. The control chamber controls the movement of the control piston and the valve needle connected thereto. To this end, flow conditions of the fuel flowing into and out of the control chamber are regulated by means of the inlet throttle and the outlet throttle. The inlet throttle is configured as a multi-stage throttle.

High-pressure injection system with a control throttle embodied as a cascade throttle

The current guided to the piezo actuator and the voltage which is consequently established thereon is used for calculating with the help of a non-linear actuator model, the characteristics of the longitudinal variations (s) and the force (F) exerted by the actuator (F), and variables therefrom or the derived variables (dF/dt) therefrom determine the beginning of the opening (tA) of a servovalve and the duration of injection (D).

Method for controlling a piezo-actuated fuel-injection valve

The invention relates to an injection valve, comprising a control chamber ( ) with a control piston ( ) that is functionally linked with a nozzle needle ( ). The control chamber ( ) is linked, via an inlet throttle ( ), with pressurized fuel, and with an outlet throttle ( ) with a valve chamber ( ). A servo valve ( ) is disposed in the valve chamber ( ), said servo valve opening a connection between the valve chamber ( ) and a return element ( ) depending on its position. The inventive injection valve further comprises a bypass throttle ( ) that is interposed between the fuel feed line and the valve chamber.

A method for setting a predetermined travel of an actuator ( ), in particular a piezo-electric actuator ( ) for an injector of an injection system is disclosed. According to said method, a first electric state variable (Q) of the actuator ( ), which determines the travel of the actuator ( ), is set. Said first electric state variable (Q) is set in accordance with the temperature (T ) of the actuator ( ), to avoid temperature-induced fluctuations of the actuator travel.

Actuator regulation device and corresponding method

A device for transmitting a deflection of a piezoelectric actuator to a movable tappet includes a pressure chamber between the piezoelectric actuator and the tappet. The pressure chamber is substantially formed by two mutually parallel diaphragms having effective radii of different lengths. The diaphragm with the longer radius is associated with the piezoelectric actuator and the diaphragm with the shorter radius is associated with the tappet. Therefore, upon a deflection of the first diaphragm by the piezoelectric actuator, the second diaphragm is deflected by a greater distance toward the tappet. A controller with an actuator having a controllable length is also provided.

Controller with an actuator of controllable length and device for transmitting the deflection of an actuator

A mechanical force transmitter converts the deformation of a piezoelectric actuator into a linear movement of a final control element. The transmission is via configuration of two mutually inclined working surfaces and a movable mechanical element disposed between the inclined working surfaces.

Device for transmitting a deflection of an actuator

A method and an apparatus for regulating a volumetric fuel flow regulate a fuel flow delivered by a feed pump to a high-pressure pump of an injection system as a function of a volumetric fuel discharged from a high-pressure reservoir through a high-pressure regulating valve. The regulation is effected through the use of a pressure regulating valve or a volumetric flow regulating valve.

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Wuppertal, Germany

Dirk Baranowski