Siemens Aktiengesellschaft

Continental Automotive Gmbh

Vitesco Technologies Gmbh

Vdo Automotive Ag

Siemens Aktiengesellschaft Ag

Walter Schrod

Eric Chemisky

Richard Pirkl

Andreas Baier

Thomas Franz

Christian Hoffmann

Hellmut Freudenberg

Martin Götzenberger

Christian Hauser

Achim Przymusinski

Hartmut Gerken

Hans-Jörg Wiehoff

Martin Hecker

Christian Reichinger

Arno Friedrich

Hans-Joerg Wiehoff

Mark Elliott

Heinz Lixl

Hartmut Wolpert

Manfred Kramel

Christian Tump

Gabriel Marzahn

Tany Gargiso

Christoph Haggenmiller

Dirk Etzler

Wolfgang Lingl

Veit Wagenseil

Albert Anzinger

Harald Schmauβ

Christoph Haggemiller

Klaus Kiel

Werner Lex

Philipp Schiller

An intermediate circuit is equipped with a first terminal connection, which includes a neutral conductor connection, and with a first and a second intermediate circuit capacitor and a diode circuit. The intermediate circuit has configuration switches which in a first state connect the intermediate circuit capacitors to one another in series and in a second state connect the intermediate circuit capacitors to one another in parallel. The configuration switches are each designed as changeover switches, which bypass the diode circuit in the first state, wherein the neutral conductor connection is connected to the diode circuit. A vehicle-based charging circuit, which includes the intermediate circuit and a rectifier circuit, is also described.

Intermediate circuit and vehicle-mounted charging circuit with intermediate circuit

A capacitive load charging/discharging device, including a first capacitor, a down-up converter including a first and a second switching element connected across the first capacitor, wherein a connecting point of the switching elements is connected to a first output terminal of the converter through a main coil. The device further includes an output circuit with a capacitive load arranged between first and second output circuit terminals, which are connected to output terminals of the converter. A discharge circuit is formed with the output circuit, the main coil and the second switching element, including an additional capacitor which is connected to a charging circuit for charging to a specified voltage, wherein the polarity of the voltage corresponds to that of the load voltage in the charged state of the capacitive load.

Device for charging and discharging a capacitive load

The disclosure relates to a circuit arrangement that includes a first DC-DC converter that is connected on the output side to a capacitor. A first terminal of the capacitor is a supply voltage terminal and a second terminal of the capacitor is a reference potential terminal. The circuit arrangement also includes a second DC-DC converter, which is connected on the input side with the capacitor and on the output side to a first terminal of a piezo actuator. The second terminal of the piezo actuator is connected to the first terminal of the capacitor.

Circuit arrangement for charging and discharging a piezo actuator

The present disclosure relates to internal combustion engines. The teachings thereof may be embodied in methods for determining a state of an injection valve of an internal combustion engine. Some methods may include actuating the piezo actuator in a pulse-width-modulated manner; recording the T on and/or T off switching times of the pulse-width-modulated piezo output stage of the piezo actuator; and evaluating the recorded switching times to derive the state of the injection valve.

Method for injection valves

A method for identifying an overcurrent when charging a piezo actuator, by periodically connecting and disconnecting the piezo actuator to and from an energy source via a charging coil. A connection is followed by a disconnection when the charging current has reached a prescribed maximum current value and a minimum switched-on time has elapsed, and a connection is effected again when either a prescribed minimum current value has been reached or a maximum switched-off time has elapsed. An overcurrent is identified when a disconnection is effected when the minimum switched-on time has elapsed and the charging current has previously reached or exceeded a prescribed maximum current value. An overcurrent is also identified when, after a disconnection on account of the prescribed maximum current value having been reached, a connection is effected again when the maximum switched-off time has elapsed without the minimum current value having been reached.

Method for identifying an overcurrent when charging a piezo actuator

A switching controller for the generation of a plurality of DC voltages includes an auxiliary secondary circuit in addition to a primary circuit and at least two main secondary circuits. Only the auxiliary secondary circuit is controlled by a control circuit. The auxiliary secondary circuit operates in a virtually powerless manner, wherein the time constant of a parallel circuit has a third output capacitor and an auxiliary load resistor is smaller than the average time constants of at least the first and second main secondary circuits, which are defined by the output capacitors thereof and the average rating values of the load resistors to be connected.

Switching regulator for producing a plurality of DC voltages

A capacitive actuator is connected to an output of an apparatus which is formed with a capacitor connected between an input and a reference potential, with a full bridge with four power switching elements connected in parallel with the capacitor. To charge the capacitive actuator, a control circuit first turns on the first and third power switching elements. Current then flows from the first capacitor via a coil connected between the bridge paths and energy is stored in the coil. When a maximum current value is reached, the first and third power switching elements are switched off and magnetic energy stored in the coil decays due to current flow via the diodes of the second and fourth power switching elements. This charges the capacitive actuator. The capacitive actuator is charged to a predefined voltage by possible repeated switching of the first and third power switching elements.

Method of operating a capacitive actuator in a motor vehicle

A device for charging and discharging a capacitive actuator connectable to an output connection has a first capacitor disposed between an input connection and a reference potential. The device has a series connection composed of a first and a second power switching element which is connected in parallel with the first capacitor. The device additionally has a first coil with a first connection connected to the center tap of the series connection, wherein the second connection of the first coil is connected to the reference potential via a third power switching element and to the output connection via a fourth power switching element. Wherein the power switching elements have diodes connected in parallel therewith such that they are reverse-biased from the input connection or the output connection to the reference potential. Wherein a connection of the fourth power switching element is connected to the input connection via a diode.

Device for charging and discharging a capacitive actuator and configuration having such a device

In a method for calibration, a piezo-actuator () is actuated in a motor vehicle by a control circuit and an output stage. The piezo actuator is, in particular, part of the injection valve. The piezo-actuator () is subjected to an electric calibration pulse that is in the high-level signal range thereof when the control circuit and the output stage are in operation, the frequency thereof being modified over time. The associated electric impendence curve over the frequency is determined and evaluated during the calibration pulse. The output stage is controlled by the control circuit in such a manner that the calibration pulse is generated.

Method and device for the calibration a piezo-actuator that is actuated in a motor vehicle for driving a switching valve

In a method and apparatus for controlling of a servo-drive, in particular of a solid state actuator in which the servo-drive is controlled during each control process by means of a two-point regulator (R2P), the two-point regulator (R2P) has a power signal (I) as control signal for actuation of the servo-drive. An upper switch point (PO) of the two-point controller (R2P) is allocated to one maximum power value (&#xce;On) and a lower switch point (PU) of the two-point controller (R2P) is allocated to one minimum power value (&#xce;Um). The upper switch point (PO) and the lower switch point (PU) are established during the controlling process so that they are separated in pairs by at least a minimum default spacing (Dmin).

Method and apparatus for controlling of a servo-drive

A current source contains a first switching element which is provided with a control input and is embodied and arranged in such a way that an output flow on an output side of a current source can be adjusted according to a control signal at the control input. The current source also contains a reference resistance that is electrically coupled to a first switching element in such a way that a potential difference above the reference resistance represents the output flow. The adjustment signal of a regulator unit depends on the voltage difference above the reference resistance, is the control signal of the first switching element, and contains a time function element which limits a first value of the output flow to a maximum duration and then reduces the value of the output flow.

Current source and control device

A tendency of the controlled load to oscillate when controlling a capacitive load can be avoided according to a piezo actuator for an injection valve of an internal combustion engine, having charging and discharging processes for charging and discharging the capacitive load by means of a load current, each loading process being effected by chronological partial load current pulses according to chronological partial charging capacity pulses (p, p, . . . pn), wherein the envelope (E) of the partial charging capacity pulses (p, p, . . . pn), during the loading process, increases in a strictly monotonous manner in an initial phase, and the slope of the envelope decreases in a monotonous manner.

Method and device for controlling a capacitive load

The invention relates to a monitoring method for an actuator (CP), in particular for a piezoelectric actuator (CP) on an injection valve for an internal combustion engine, comprising the following steps: measurement of the electrical current (iR), flowing through the actuator (CP) in an actuator circuit, measurement of the electrical current (iR), flowing before or after the actuator (CP) in the actuator circuit, comparison of both measured currents (iR, iR) for recognition of a fault and generation of a diagnostic signal (DIAG), displaying the fault, depending on the comparison. According to the invention, the diagnostic signal (DIAG) can take on at least three different values for the representation of an earth short-circuit, a voltage short-circuit and an error-free status depending on the comparison of the measured currents. The invention further relates to a corresponding driver circuit.

Monitoring method for an actuator and corresponding driver circuit

A method for the electric control of an actuator, especially a piezoelectric actuator of an injection system comprises the following steps: charging the actuator; waiting during a specific period of time (D, D) and discharging the actuator after the expiration of the period of time (D, D). The period of time (D, D) is variably determined in order to compensate the quantization steps.

Method for controlling an actuator and control device belonging thereto

Defective actuators in an internal combustion engine with at least one cylinder are detected. A mean value, in particular the arithmetic mean value, determines a measurement variable of all the actuators of a given type present on the cylinders. The measurement variable depends on at least one parameter. In a further step, a deviation is formed which is independent of the parameter. This ensures that the deviation across the entire parameter range remains constant. In a further step, the limit values, in particular the upper and lower limit values, are formed, the limit values being dependent on the deviation and on the mean value formed above. If an individual value of the measurement variable exceeds one of the two limit values, the method according to the invention detects this actuator as faulty and/or defective.

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Wuppertal, Germany

Walter Schrod