EP1806494A2 - Dispositif et méthode pour détecter la fin du déplacement d'un piston dans une valve - Google Patents

Dispositif et méthode pour détecter la fin du déplacement d'un piston dans une valve Download PDF

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Publication number
EP1806494A2
EP1806494A2 EP06119822A EP06119822A EP1806494A2 EP 1806494 A2 EP1806494 A2 EP 1806494A2 EP 06119822 A EP06119822 A EP 06119822A EP 06119822 A EP06119822 A EP 06119822A EP 1806494 A2 EP1806494 A2 EP 1806494A2
Authority
EP
European Patent Office
Prior art keywords
valve
predetermined
uind
output
threshold value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06119822A
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German (de)
English (en)
Other versions
EP1806494A3 (fr
Inventor
Stephan Bolz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1806494A2 publication Critical patent/EP1806494A2/fr
Publication of EP1806494A3 publication Critical patent/EP1806494A3/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027—Control of the current by pulse width modulation or duty cycle control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • F02D2041/2072—Bridge circuits, i.e. the load being placed in the diagonal of a bridge to be controlled in both directions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • F02D2041/2075—Type of transistors or particular use thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/063—Lift of the valve needle

Definitions

  • the invention relates to a device and a corresponding method for detecting an end of a movement of a valve piston in a valve, in particular in a magnetically bistable solenoid valve for an injection valve of an internal combustion engine in a motor vehicle.
  • the object of the invention is to provide an apparatus and a corresponding method for detecting an end of a movement of a valve piston in a valve that is reliable.
  • the invention is characterized by a device and a corresponding method for detecting in each case one end of a movement of a valve piston in at least one valve.
  • the device can be coupled to the at least one valve.
  • the apparatus is configured to detect a first quantity representative of an induction voltage induced by movement of the valve piston in a coil of the valve.
  • the apparatus is further configured to determine a second quantity representative of a first derivative of the first magnitude in time. Further, the apparatus is configured to detect the end of movement of the valve piston in the valve when the first magnitude is greater than a predetermined first threshold and the second magnitude falls below a predetermined second threshold.
  • the recognition can be particularly reliable. If the first variable is greater than the predetermined first threshold value, then it can be ensured that the induction voltage is sufficiently large and that the induction voltage is in particular greater than any noise or possibly existing other interference signals. Due to the end of the movement of the valve piston, the induction voltage has a characteristic course, in particular a kink, after which the induction voltage drops faster than its previous course. If the second variable falls below the predetermined second threshold value, this characteristic profile of the induction voltage can be reliably detected at the end of the movement of the valve piston. For example, the device is configured to generate a signal to signal the detection of the end of the valve piston in the valve.
  • the predetermined first threshold value and / or the predetermined second threshold value are predefined as a function of the first variable. This has the advantage that the detection of the end of the movement of the valve piston with different induction voltage is reliably possible.
  • the induction voltage is e.g. different sizes with different valves or with different state of wear of the at least one valve.
  • the predetermined first threshold value or the predetermined second threshold value is predefined as a function of the first variable only if the first variable is greater than a predefined third threshold value.
  • the predetermined third threshold is preferably so large that it is not affected by the noise or other noise of the first size is exceeded.
  • the predetermined third threshold value is preferably so small that even with a low induction voltage, the end of the movement of the valve piston can be reliably detected. The detection of the end of the movement of the valve piston can be so robust against noise and other interference signals and against different sized induction voltages.
  • the device comprises a first impedance converter whose input-side impedance is greater than the output-side impedance and the input side, the induction voltage can be supplied. Furthermore, the device comprises a second impedance converter, whose input-side impedance is smaller than its output-side impedance and the output side is coupled via a series circuit of a resistor and a capacitor to an output of the first impedance converter. The first variable can be detected on the output side of the first impedance converter. Furthermore, the second size can be determined on the output side of the second impedance converter.
  • the advantage is that such a device can be very simple and inexpensive.
  • the first and the second impedance converter can be formed, for example, by at least one transistor in each case. Furthermore, such a device can be designed to be particularly inexpensive as an integrated circuit.
  • a low-pass filter is provided on the input side. This has the advantage that noise and high-frequency interference can be reduced and thereby the detection of the end of the movement of the valve piston can be done very reliable.
  • the device has a voltage divider, which is arranged electrically between a supply potential and a ground potential and which is designed as a series connection of at least three resistors and at each between two successive resistors of the predetermined first threshold and predetermined second threshold can be tapped.
  • the device on the output side comprises a first and a second comparator, each having an open-collector output.
  • the device is designed such that the first comparator is supplied with the first variable at its positive input and the predetermined first threshold value at its negative input.
  • the second comparator is supplied to the second size at its negative input and the predetermined second threshold at its positive input.
  • the open collector output of the first comparator and the open collector output of the second comparator are connected together and form an output of the device.
  • the device has on the input side a protective circuit which comprises at least one diode and a resistor and which is designed such that when the input voltage is exceeded, the diode conducts and a current flow through the diode is limited by the resistor.
  • the device is thus robust and simple and reliably protects the device from an input-side overvoltage.
  • a valve for example a control valve for an injection valve for an internal combustion engine in a motor vehicle, comprises a valve housing 1, which has a recess in which a Valve piston 2 is arranged axially movable ( Figure 1).
  • the valve has an inlet 3 and two outlets 4, which are formed in the valve housing 1. Furthermore, 1 outflows 5 are formed in the valve housing.
  • the inlet 3 can be coupled, for example, with a fluid reservoir, not shown, from which the valve, a fluid, such as hydraulic oil or engine oil, can be supplied.
  • the outlets 4 open, for example, in a control chamber, not shown, adjacent to the example, a hydraulic ram, which is movable depending on a fluid pressure in the control chamber for opening and closing the injector.
  • the inlet 3 is hydraulically coupled via grooves 8, which are formed in the valve piston 2 and the valve housing 1, with the outlets 4 or are the outlets 4 with the outflows 5 coupled. Through the outflows 5, the fluid can flow out of the control room.
  • the valve has a first cap 6 and a second cap 7, each disposed at an axial end of the valve.
  • the first cap 6 and the second cap 7 limit a stroke of the valve piston 2 in the valve housing 1.
  • Adjacent to the first cap 6 is a first coil L1 and adjacent to the second cap 7, a second coil L2 is arranged.
  • a suitable energizing the first coil L1 and the second coil L2 a magnetic field can be constructed so that the valve piston 2 is attracted by this and is moved against the stroke limit formed by the first cap 6 and the second cap 7.
  • the first cap 6 and the second cap 7 are formed so that even after stopping energizing the first coil L1 and the second coil L2 by a corresponding magnetizing the first Cap 6 and the second cap 7 a remanence magnetic field is maintained.
  • the valve piston 2 can thus maintain its current position on the first cap 6 and the second cap 7 until the valve piston 2 is pulled by the energizing of the respective opposite coil to the associated cap.
  • the valve thus forms a solenoid bistable solenoid valve.
  • the valve can also be designed differently.
  • Figure 2 shows a circuit arrangement which is designed for driving the valve.
  • the circuit arrangement has a control device 9 which, for example, generates a pulse-width-modulated control signal, which is supplied to a first switch SW1.
  • the first switch SW1 is electrically arranged between a positive potential of a battery voltage UBAT and a first terminal of the first coil L1.
  • the battery voltage UBAT is for example about 24 volts.
  • the first switch SW1 and the first terminal of the first coil L1 are coupled via a reverse-direction first diode D1 to a negative potential of the battery voltage UBAT, which is referred to as a ground potential GND.
  • a second terminal of the first coil L1 is coupled to the ground potential GND via a second switch SW2.
  • the second switch SW2 is provided for selecting the valve, if further valves can be controlled by the control device 9.
  • the second terminal of the first coil L1 is coupled via a reverse-connected second diode D2 to the positive potential of the battery voltage UBAT.
  • the first switch SW1, the second switch SW2, the first diode D1, and the second diode D2 are respectively provided for the second coil L2.
  • the control device 9 is preferably formed, the pulse width modulated To generate control signal corresponding to the second coil L2.
  • the first coil L1 and the second coil L2 are preferably energized alternately so that the valve piston 2 is moved to the respective other axial position on the first cap 6 and the second cap 7.
  • the respectively energized coil is used to detect the movement of the valve piston 2 in the valve housing 1.
  • Characterized in that the first cap 6 and the second cap 7 or the valve housing 1 or the valve piston 2 are magnetized, can be induced by the movement of the valve piston 2 by the prevailing magnetic field, an induction voltage in the first coil L1 and in the second coil L2 , This induction voltage is particularly easy to detect in the respective de-energized coil.
  • FIG. 3 shows a first diagram in which a profile of an electrical current I through the first coil L1 and the second coil L2 during the energizing is shown.
  • the energizing of the respective coil starts at a starting time t0 by the switching on of the coil associated with the first switch SW1 and second switch SW2.
  • the electric current I increases until a predetermined current is reached.
  • the current I is kept in a predetermined range by alternately turning on and off the first switch SW1.
  • UIND which is representative of this induction voltage.
  • the first variable UIND shows a characteristic value Course in the form of a bend B.
  • the kink B is caused by the end of the movement of the valve piston. Since the induction voltage is not further induced after the first time t1, the first magnitude UIND falls faster after the time t1 than before the first time t1. The end of the movement of the valve piston can thus be detected by detecting the bend B in the course of the first variable UIND.
  • Figure 4 shows a block diagram of a device for detecting the end of the movement of the valve piston in the valve.
  • the device has an input IN, via which the device, the induction voltage or the first size UIND can be fed.
  • a protection circuit 10 is provided on the input side of the device in order to protect the device from an excessive input voltage at the input IN and thus to prevent damage to the device.
  • the protection circuit 10 is coupled to a buffer 11, which is designed, for example, as a first impedance converter.
  • the device can thus be coupled, for example, with high impedance to the first coil L1 or the second coil L2 or further coils in optionally provided further valves.
  • the first variable UIND can be tapped.
  • the buffer 11 is coupled to a differentiator 12 which forms a first derivative of the first magnitude UIND in time and provides on the output side a second quantity UDERIV representative of the first derivative of the first magnitude UIND in time. Furthermore, a reference generator 13 is provided in the device, which generates and predefines a predetermined first threshold value THR1 and a predetermined second threshold value THR2.
  • a first comparator 14 is provided for comparing the first quantity UIND with the predetermined first threshold value THR1.
  • a second comparator 15 is provided for comparing the second variable UDERIV with the predetermined second threshold THR2.
  • the first comparator 14 and the second comparator 15 are logically linked together via an AND gate 16.
  • An output OUT of the device is constituted by an output of the AND gate 16.
  • the detection of the end of the movement of the valve piston is signaled when the first magnitude UIND is greater than the predetermined first threshold THR1 and the second magnitude UDERIV below the predetermined second threshold value THR2 falls (FIG. 5). Signaling at the output OUT is effected, for example, by an output pulse P of an output voltage UOUT.
  • the output pulse P may, for example, be supplied to a control unit, not shown, which is designed to control the valve as a function of the second point in time t2, which is marked by the output pulse P, such that e.g. a predetermined amount of fuel is injected.
  • a method corresponding to the block diagram may also be provided, e.g. in the form of a program executed by the control unit.
  • FIG. 5 shows a curve of the second variable UDERIV, the predefined second threshold value THR2 and the output voltage UOUT.
  • the second variable UDERIV falls below the predetermined second threshold value THR2 and triggers the output pulse P in the output voltage UOUT if, at the same time, the first variable UIND is greater than the predetermined first threshold value THR1 (FIG. 3).
  • the output pulse P occurring at the second time t2 is delayed from the occurrence of the break B at the first time t1 (FIG. 6).
  • the device may be designed so that this delay is largely constant and so the first time t1, so the end of the movement of the valve body in the valve, can be reliably determined.
  • FIG. 7 shows a first embodiment of the device.
  • the device is designed to detect the respective end of the movement of the valve piston in six valves, which are electrically coupled together in two banks of three valves each.
  • the valves are preferably controlled sequentially and without overlap with respect to their control.
  • Such a device is preferably provided in each case for the first coil L1 and for the second coil L2. If the valves are actuated overlapping, then additional devices may be necessary.
  • the elements of the device associated with the second valve bank have reference symbols with an additional bar and correspond in each case to the elements associated with the first valve bank. The device is explained below with reference to the first coil L1 according to FIG. 2.
  • the input IN of the device is electrically coupled to the second diode D2 and the second switch SW2.
  • the input IN is further coupled via a first resistor R1 and a reverse direction arranged third diode D3 with a supply potential USUP, which is for example about 5 volts with respect to the ground potential GND.
  • the first resistor R1 and the third diode D3 are electrically coupled to a node K1, which in turn is connected to a base terminal of a first transistor T1 and via a first capacitor C1 is coupled to the ground potential GND.
  • the input IN is further coupled via a second resistor R2 to the ground potential GND.
  • the first coil L1 discharges via the second resistor R2.
  • the exponential voltage drop after the first time t1 is influenced by the second resistor R2.
  • the first resistor R1 has a resistance of about 10 kilohms
  • the second resistor R2 has a resistance of about 500 ohms, for example.
  • the first resistor R1 and the third diode D3 form the protection circuit 10. If a voltage between the input IN and the ground potential GND is greater than the sum of a voltage between the supply potential USUP and the ground potential GND and a forward voltage of the third diode D3, then the third diode D3 conductive. A current flow through the third diode D3 is then limited by the first resistor R1. Furthermore, the first resistor R1 with the resistors R1 'and R2' forms a voltage divider which reduces the voltage between the node K1 and the ground potential GND with respect to the voltage between the input IN and the ground potential GND. As a result, the device is protected against overvoltages at the input IN. Furthermore, a low-pass filter is formed by the first resistance R1 and the first capacitor C1, which is preferably designed such that noise and other interference signals at the node K1 are largely suppressed.
  • the buffer 11 is formed by the first transistor T1, which is connected as a collector circuit.
  • a collector terminal of the first transistor T1 is connected to the ground potential GND, and an emitter terminal of the first transistor T1 is coupled to the supply potential USUP via a third resistor R3.
  • the emitter terminal of the first Transistor T1 forms a node K2, at which the first variable UIND is provided in a low-impedance manner.
  • the collector circuit of the first transistor T1 has an input-side impedance which is greater than its output-side impedance. The first transistor T1 thus forms the first impedance converter.
  • the differentiator 12 is formed by a second capacitor C2 and a fourth resistor R4, which form a series circuit, and a second transistor T2 and a fifth, sixth, seventh and eighth resistor R5, R6, R7, R8, the operating point of the second transistor T2 serve.
  • the second transistor T2 is connected as a base circuit.
  • An emitter terminal of the second transistor T2 is coupled via the fifth resistor R5 to the supply potential USUP and a collector terminal of the second transistor T2 is coupled via the sixth resistor R6 to the ground potential GND.
  • a base terminal of the second transistor T2 is coupled to the supply potential USUP via the seventh resistor R7 and coupled to the ground potential GND via the eighth resistor R8.
  • the series connection of the second capacitor C2 and the fourth resistor R4 is arranged electrically between the second node K2 and the emitter terminal of the second transistor T2.
  • the second transistor T2 forms by its base circuit a second impedance converter whose input-side impedance is smaller than the output-side impedance.
  • a cut-off frequency of the differentiator 12 is essentially given by 1 / (2 * ⁇ * R4 * C2) and is for example about 200 kHz.
  • a voltage gain of the second transistor T2 is given by a ratio of the sixth resistor R6 and the fourth resistor R4.
  • the second variable UDERIV can be determined.
  • the collector terminal of the second transistor T2 is coupled to a base terminal of a third transistor T3, which is connected as a collector circuit.
  • the third transistor T3 thus forms a third impedance converter whose input-side impedance is greater than the output-side impedance.
  • a collector terminal of the third transistor T3 is coupled to the ground potential GND and an emitter terminal of the third transistor T3 is coupled via a ninth resistor R9 to the supply potential USUP.
  • a multi-stage voltage divider is arranged, which forms the reference generator 13 and which is formed from a series connection of a tenth, eleventh, twelfth and thirteenth resistor R10, R11, R12, R13.
  • the tenth resistor R10 is electrically arranged between the supply potential USUP and a node K3.
  • the node K3 is coupled via a third capacitor C3 to the emitter terminal of the third transistor T3.
  • the eleventh resistor R11 is disposed between the third node K3 and a fourth node K4, and the twelfth resistor R12 is disposed between the fourth node K4 and a fifth node K5.
  • the thirteenth resistor R13 is arranged between the fifth node K5 and the ground potential GND.
  • the second variable UDERIV can be tapped.
  • the node K4 is coupled to the ground potential GND via a fourth capacitor C4. Accordingly, the fifth node K5 is coupled to the ground potential GND via a fifth capacitor C5.
  • the predetermined first threshold voltage THR1 preferably has approximately a value which is half as large as an expected maximum amount of the first variable UIND. For example, if the maximum amount corresponds to the supply potential USUP of 5 volts, then the predetermined first threshold voltage THR1 is preferably about 2.5 volts.
  • the predetermined second threshold voltage THR2 is tapped between the third node K3 and the fourth node K4, ie via the eleventh resistor R11.
  • the predetermined first threshold value THR1 and the predetermined second threshold value THR2 are thus predefined as a function of a dimensioning of the voltage divider.
  • the device further comprises a first comparator COMP1 and a second comparator COMP2.
  • the first comparator COMP1 is coupled on the input side with its positive input to the second node K2 and coupled with its negative input to the fifth node K5.
  • the first comparator COMP1 thus forms the first comparator 14, which compares the first quantity UIND with the predetermined first threshold value THR1.
  • the second comparator COMP2 is coupled with its negative input to the third node K3 and its positive input to the fourth node K4.
  • the second comparator COMP2 thus forms the second comparator 15, which compares the second variable UDERIV with the predetermined second threshold THR2.
  • the first comparator COMP1 and the second comparator COMP2 each have an open-collector output.
  • the AND gate 16 can be realized very easily by connecting the respective outputs of the first comparator COMP1 and the second comparator COMP2.
  • the linked open-collector outputs of the first comparator COMP1 and the second comparator COMP2 thus form the output OUT of the device.
  • the output OUT is coupled to the supply potential USUP via a fourteenth resistor R14.
  • kink B occurs in the course of the first magnitude UIND, then the potential drops at the third node K3. Since the potential at the fourth node K4 is supported by the charge on the fourth capacitor C4, the potential at the third node K3 may be maintained for a short period of time, e.g. for a few tens of microseconds, fall below the potential of the fourth node K4 and thus on the output side of the second comparator COMP2 cause a positive pulse about for the duration of the undershoot. At the same time the potential at the second node K2 is greater than that at the fifth node K5, then the output pulse P is generated at the output OUT.
  • the voltage divider of the tenth, eleventh, twelfth and thirteenth resistor R10, R11, R12, R14 may also be formed of only three resistors when the second size UDERIV is tapped at the emitter terminal of the third transistor T3 instead of at the third node K3 and the tenth and the eleventh resistor R10, R11 are combined into one resistor.
  • the fourth and the fifth capacitor C4, C5 can then be dispensed with.
  • FIG. 8 shows a second embodiment of the device which corresponds to the first embodiment in FIG.
  • the tenth resistor R10 is divided into a first sub-resistor R10a and a second sub-resistor R10b.
  • a sixth node K6 is electrically formed between the first sub-resistor R10a and the second sub-resistor R10b.
  • a fourth diode D4 is coupled with its cathode connection to the sixth node K6 and coupled with its anode connection to the second node K2.
  • the predetermined third threshold value is predetermined by a corresponding dimensioning of the first under resistance R10a as well as the second under resistance R10b, the eleventh resistance R11, the twelfth resistance R12 and the thirteenth resistance R13.
  • the third threshold value is predetermined such that it is greater than any noise present in the first quantity UIND or other interference signals present, but is so small that the bend B in the course of the first variable UIND can be reliably detected even if the first size UIND has only a small amount.
  • the advantage is that by varying the potential at the fourth node K4 depending on the potential at the second node K2, the predetermined second threshold value is adjusted as a function of the first quantity UIND, since it is to be expected that the second quantity UDERIV is present of the bend B depends on the amount of the first size UIND more or less far. As a result, the kink B can be reliably detected largely independently of the amount of the first variable UIND.
  • the delay between the first time t1 of the occurrence of the bend B and the output pulse P at the second time t2 can be substantially constant.
  • the end of the movement of the valve piston 2 can be determined very precisely.
  • the predetermined third threshold is, for example, about two to three volts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
EP06119822.2A 2005-09-20 2006-08-30 Dispositif et méthode pour détecter la fin du déplacement d'un piston dans une valve Withdrawn EP1806494A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005044886A DE102005044886B4 (de) 2005-09-20 2005-09-20 Vorrichtung und Verfahren zum Erkennen eines Endes einer Bewegung eines Ventilkolbens in einem Ventil

Publications (2)

Publication Number Publication Date
EP1806494A2 true EP1806494A2 (fr) 2007-07-11
EP1806494A3 EP1806494A3 (fr) 2014-05-21

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Application Number Title Priority Date Filing Date
EP06119822.2A Withdrawn EP1806494A3 (fr) 2005-09-20 2006-08-30 Dispositif et méthode pour détecter la fin du déplacement d'un piston dans une valve

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Country Link
US (1) US7454299B2 (fr)
EP (1) EP1806494A3 (fr)
DE (1) DE102005044886B4 (fr)

Cited By (1)

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WO2010069779A1 (fr) * 2008-12-19 2010-06-24 Robert Bosch Gmbh Procédé de détermination d'un mouvement d'induit d'une soupape d'injection

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005044886B4 (de) * 2005-09-20 2009-12-24 Continental Automotive Gmbh Vorrichtung und Verfahren zum Erkennen eines Endes einer Bewegung eines Ventilkolbens in einem Ventil
US8368490B2 (en) 2008-12-18 2013-02-05 Analog Devices, Inc. Micro-electro-mechanical switch beam construction with minimized beam distortion and method for constructing
US8294539B2 (en) 2008-12-18 2012-10-23 Analog Devices, Inc. Micro-electro-mechanical switch beam construction with minimized beam distortion and method for constructing
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US7454299B2 (en) 2008-11-18
US20070067127A1 (en) 2007-03-22
EP1806494A3 (fr) 2014-05-21

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