DE102016124139A1 - Fuel injector with integrated sensors - Google Patents

Abstract

The invention relates to a fuel injector with a valve (13) for releasing or ending fuel injections, an electrically controllable valve actuator (12) for actuating the valve and an integrated sensor system (16). The fuel injector (10) comprises an energy store (30) with a charging device (31). The energy store (30) is connected via the charging device (31) with at least one line (IV +) for the supply energy of the Ventilaktuators (12). The charging device (31) is designed to charge the energy store (30) from the electrical currents in this line (IV +).
The figure intended for publication with the abstract is 1 ,

Description

The invention relates to a fuel injector for attachment to an internal combustion engine, which is connectable via a plurality of electrical lines with an electronic control unit, wherein the fuel injector is an integrated sensor for detecting and feedback of instantaneous states of the injector is formed.

Previously known fuel injectors with integrated sensors require a plurality of electrical lines, in particular six separate electrical lines for connection to the electronic control unit.

It is an object of the present invention to provide an improved fuel injector and an associated electrical control unit, with which the number of necessary electrical lines are reduced. Further, a fuel supply system is shown comprising such a fuel injector and an electronic control unit.

The fuel injector according to the present disclosure includes a valve for releasing or stopping fuel injections, an electrically controllable valve actuator for actuating the valve, and integrated sensors.

The fuel injector further comprises a preferably integrated energy store with a charging device. The energy storage is connected via the charging device with a line for the supply energy of the Ventilaktuators. The charging device is designed to charge the energy store from the electrical currents in this line.

In other words, a proportion of the comparatively high supply energy of the valve actuator is used to charge the energy store. In this way, it is possible to dispense with a separate line for the energy supply of the integrated sensor system and any further control components of the fuel injector. In particular, it is possible to dispense with a separate phase conductor for the energy supply of the sensor system and / or a control section on or in the fuel injector.

The reduction in the number of necessary lines has several advantages. On the one hand smaller and less expensive manufacturable connectors can be used, so cost advantages and easier installation are possible. Also error sources with regard to the electrical contact are reduced.

As prices for copper and other metals used to make electrical wiring and connectors increase and semiconductor prices fall, the cost advantage will be even higher in the future.

As a rule, pulsating currents or current pulses occur in a line for the supply energy of the valve actuator. The energy required for charging the energy store can be diverted in various ways.

On the one hand, a pure current pulse can be provided for actuating the valve actuator. During the current pulse, the current rises from a zero level to an elevated level and remains at that level or at an average current level for the duration of the actuation. At the end of the actuation, the current drops back to zero. From this current pulse, a part of the transmitted energy can be diverted. During the duration of the current pulse, a portion of the current is then used to charge the energy storage. Alternatively, a charging pulse can be superimposed on the current pulse necessary for actuation. During actuation of the valve actuator, the current level may be increased to such an extent that, in addition to the amount of energy for the actuation, a sufficient amount of energy is transferred to charge the energy storage device. In both cases, a charge of the energy storage takes place (only) during the current pulse.

According to an alternative or additional embodiment variant, in the line for the supply energy of the Ventilaktuators at least in a period between the Aktuierungen a different flow from the zero level, which is used for charging the energy storage. This current can be so low that it does not lead to actuation of the valve actuator and thus to an opening of the valve in the fuel injector. It can be provided that a charging current is transmitted only in the periods between two actuations. Alternatively, a charging current can be transferred in superposition to the current pulses for the actuation.

It may further be provided that for the actuation of a fuel injection, a current pulse having a first current direction (plus or minus) is transmitted, while for the charging current, an opposite current direction (minus or plus) is provided.

The charging device is preferably designed to separate a charging current for the energy store from a current pulse for the actuation of a fuel injection. This way you can a negative impact on the dynamics of the actuation can be avoided.

According to a preferred refinement, the (integrated) energy store is connected by a regulator to the internal sensor system and / or a control section of the fuel injector. The regulator is designed to deliver a regulated voltage or a regulated potential, in particular a constant supply voltage. In practice, suitable circuits for voltage regulation are known.

By operating the sensors with a regulated and, in particular, constant voltage, the accuracy of performing a measurement and / or transmitting the measured values can be increased, in particular in the case of analog measuring and transmission techniques. It is also possible to use sensors and associated components of the sensors in a simple design. The signals output by the integrated sensor system, in particular analogue transmission signals, can preferably be used directly, i. without a subsequent correction of the signals to compensate for errors resulting from fluctuations in the supply voltage. At the same time, a regulated supply energy, in particular a regulated voltage for a control section of the fuel injector can be provided.

According to a further aspect of the present disclosure, which can be used alone or in conjunction with the aforementioned energy store, a ground contact of the integrated sensor and / or a ground contact of a control section of the fuel injector is provided to be connected to a ground contact of the motor housing of an internal combustion engine be, on which the fuel injector can be arranged. The fuel injector further comprises a switching device which alternately connects a transmission line leading to the electronic control unit on the one hand to a signal line of the integrated sensor and / or a signal line of the control section and on the other hand to the ground contact on the motor housing, wherein the switching takes place according to a flow chart.

Thus, a combined transmission signal is formed in the (common) transmission line, which contains a transmission signal of the integrated sensor and / or the control section in a first time component according to the flowchart and enables a measurement of the instantaneous base potential at the ground contact in a second time component according to the flowchart , On a separate ground line of the integrated sensors and / or a control section to the electronic control unit can thus be dispensed with.

Another aspect of the present disclosure provides that the (direct or corrected) signals from at least two sensors are combined by a signal transformer in a common transmission signal, for example by a multiplexing method.

The combination of two or more signals may alternatively or additionally be performed using a transmission technique according to DE 10 2014 102 163 be performed, wherein the signal transformer comprises a signal processor, which converts at least one raw signal of a sensor into an analog transmission signal having a finite total bandwidth and the raw signal is split according to an overlap with predetermined subsections in signal parts. Each signal part is mapped to a common measured value transmission section in the transmission signal by a forward transformation associated with the subsection. Furthermore, coded information about the affected subsection and / or the applied forward transformation is embedded in the transmission signal.

The electronic control unit is preferably designed to receive a combined transmission signal and to extract the signal components contained therein.

The electronic control unit may be designed in particular for carrying out a demultiplexing method.

When a transmission technique according to the DE 10 2014 102 163 is used, the electronic control unit may be designed in particular for receiving a transmission signal with an embedded coded information, wherein an A / D converter receives the transmission signal and converts it into a digital intermediate signal. The embedded coded information about an affected subsection and / or an executed forward transformation is extracted from the transmission signal or the intermediate signal. A backward transformation is selected and the intermediate signal is converted to a digital computation value with the backward transformation.

The electronic control unit preferably comprises an evaluation unit which is designed to extract the various signal components from the combined transmission signal and / or to carry out the inverse transformation.

Further advantageous embodiments are explained in the following description of the drawings.

• 1: Ein Kraftstoffversorgungssystem mit einem Kraftstoffinjektor und einer elektronischen Steuereinheit, bei dem eine hohe Anzahl elektrischer Leitungen zur Verbindung des Kraftstoffinjektors mit der elektronischen Steuereinheit vorgesehen sind.
• 2 bis 5: Ausführungsbeispiele gemäß der vorliegenden Offenbarung, bei denen eine geringere Anzahl elektrischer Leitung zur Verbindung des Kraftstoffinjektors mit der elektronischen Steuereinheit ermöglicht ist.

The invention is illustrated by way of example and schematically in the drawings. Show it:

• 1 : A fuel supply system with a fuel injector and an electronic control unit, in which a large number of electrical lines for connection of the fuel injector are provided with the electronic control unit.
• 2 to 5 Embodiments according to the present disclosure, wherein a smaller number of electrical line for connection of the fuel injector with the electronic control unit is made possible.

A fuel supply system with a fuel injector ( 10 ) and an electronic control unit ( 50 ) in a Ausgansversion are in 1 shown. The fuel injector ( 10 ) is a total of six electrical lines with the electronic control unit ( 50 ) connected. In the electronic control unit ( 50 ) is an electric drive unit / EDU ( 51 ) containing the supply energy for the operation of the Ventilaktuators ( 12 ). The representation in 1 serves to illustrate advantages that can be achieved by the features according to the present disclosure.

As far as the same reference numerals are used in the various embodiments, essentially identical components are meant. The associated disclosed features apply mutatis mutandis to all embodiments, unless otherwise explained.

The fuel injector ( 10 ) comprises a valve ( 13 ), which permits fuel flow through a fuel passage ( 14 ) to the one or more injection ports ( 15 ) may allow or block to thereby release or terminate fuel injection. Actuation of the valve ( 13 ) takes place directly or indirectly through the electrically controllable valve actuator ( 12 ).

The operative relationship between the valve actuator ( 12 ) and the concrete movement of the valve ( 13 ) can be of any kind. According to a first embodiment, the valve ( 13 ) directly through the valve actuator ( 12 ) (directly actuated fuel injector). According to an alternative and preferred variant, the valve actuator ( 12 ) a servo valve (not shown), which in turn hydraulically the movement of the valve ( 13 ) (indirectly actuated fuel injector).

By using a servo valve, it is possible to use a major part of the energy required for the movement of the valve ( 13 ) is to be obtained from the pressure level of a high-pressure fuel with which the fuel injector ( 10 ) is fed. Via the electrically controllable valve actuator ( 12 ) then a relatively lower proportion of the actuation energy is contributed to specify the switching states of the servo valve. Accordingly, a lower electrical power to operate the Ventilaktuators ( 12 ) required.

The fuel injector ( 10 ) has an integrated sensor system ( 16 ), which can be configured as desired. It can in particular be a first sensor ( 17 ) and a second sensor ( 18 ) exhibit. Advantageous designs and uses of the sensors ( 17 . 18 ) will be explained below.

The fuel injector ( 10 ) further comprises a control section ( 20 ) with a controller ( 21 ) and a memory ( 22 ). The controller ( 21 ) and the memory ( 22 ) can take on any tasks and perform appropriate procedures. For example, the controller can read measured values or signals from the sensors ( 17 , 18) correct, for example, to compensate for influences of known disturbances, age-related drift, etc. or eliminate. Alternatively or additionally, the controller ( 21 ) Perform learning procedures to determine individual properties of the fuel injector or the integrated sensors. The compensation or elimination of the above-mentioned influences may occur depending on parameters learned during the life of the fuel injector. Such parameters can be stored in memory ( 22 ). On the one hand, it can be parameters determined by the manufacturer or learned parameters after production. Again, alternatively, they may be parameters that are updated during maintenance of the internal combustion engine.

For connecting the fuel injector ( 10 ) according to 1 with the electronic control unit ( 50 ) Several lines are provided. A first and a second electrical line (phase line IV - and ground wire IV + ) are provided to supply the supply energy of the valve actuator directly between the electronic control unit ( 50 ) and the fuel injector ( 10 ) transferred to. A third and a fourth electrical line (signal line Sl, signal line S2 ) are for transmitting a measurement signal of the first sensor ( 17 ) and / or the second sensor ( 18 ) intended. Alternatively, you can transmit communication signals between the controller ( 21 ) and the electronic control unit ( 50 ) be provided.

A fifth and a sixth electrical line (phase conductor IS + , Ground conductor IS -) are for the direct transmission of the supply energy for the integrated sensors ( 16 ) and / or the control section ( 20 ) between the electronic control unit ( 50 ) and the fuel injector ( 10 ) intended. The transmission of the supply energy for the integrated sensors ( 16 ) and / or the control section ( 20 ) is usually at considerable lower power than the transmission of the supply energy for the actuation of the valve actuator.

The connecting lines ( IV + . IV -, Sl, S2, IS + . IS -) can preferably via a common connector ( 19 ) on the housing of the fuel injector ( 10 ). Furthermore, a further common plug-in connection to the electronic control unit ( 50 ) (not shown) to connect the lines of one or more fuel injectors ( 10 ).

2 shows a fuel injector ( 10a ) according to a first embodiment of the present disclosure. The fuel injector ( 10a ) comprises an injection section ( 11 ) with a fuel passage ( 14 ) and a valve ( 13 ), which by a valve actuator ( 12 ) is operable directly or indirectly to permit fuel injection from the one or more injection ports ( 15 ) to release or terminate. The fuel injector ( 10a ) further comprises an integrated sensor system ( 16 ) with a first sensor ( 17 ) and a second sensor ( 18 ). He may also have a control section ( 20 ) with a controller ( 21 ) and a memory ( 22 ) exhibit. The formation of the aforementioned components is analogous to 1 ,

In addition, the fuel injector ( 10a ) an energy store ( 30 ) with a loading device ( 31 ) on. In the example of 2 is the loading device ( 31 ) with the wires (phase conductor IV + , Ground conductor IV -), via which the supply energy of the Ventilaktuators of the electronic control unit ( 50 ) provided.

The energy store and the charging device can be designed in various ways. The energy store ( 13 ) may be formed, for example, as a capacitor. The loading device ( 31 ) comprises in a first variant at least one electronic valve ( 31 ), for example in the form of a diode. By the electronic valve can be achieved that in the case of a current flow in a first direction of current on the lines ( IV - IV + ) a proportionate current flow for charging the energy store ( 30 ), for example when on the phase line ( IV + ) opposite the ground line ( IV -) there is a strong positive potential. If, on the other hand, there is no current flow or a current flow running in the opposite direction, a backflow of energy from the energy store ( 30 ), which could lead to the discharge of the energy storage, avoided. This could be a condition where on the phase line ( IV + ) is at a zero level.

According to an alternative embodiment, the loading device ( 31 ) be designed as a voltage-dependent filter and (only) in the case of a small potential difference between the phase line ( IV + ) and the ground line ( IV -) a current flow to the energy store ( 30 ), so that it is charged. On the other hand, with a relatively large potential difference between the phase line ( IV + ) and the ground line ( IV -) a current flow to or from the energy store ( 30 ) are blocked. In addition, the aforementioned function of an electric valve (diode) to protect the energy storage ( 30 ) be provided before discharge.

Through the energy storage ( 30 ) becomes an (internal) supply potential ( IS + ' ) for the control section ( 20 ) and / or the integrated sensor system ( 16 ) provided. It can thus be applied to the phase line ( IS + ) between the electronic control unit ( 50 ) and the fuel injector ( 10a ) are waived. Thus, the number of electrical lines in the fuel injector ( 10a ) in 2 opposite the fuel injector ( 10 ) in 1 reduced by a ladder.

3 shows a second embodiment of the fuel injector (10b) according to the present disclosure. In the example of 3 is also an (integrated) energy store ( 30 ) is provided on the fuel injector (10b). Alternatively, the fuel injector (10b) according to the second embodiment without such an energy storage ( 30 ) be formed.

In the fuel injector (10b), the second sensor ( 18 ) for detecting a first physical quantity, in particular for detecting a temperature such as the current fuel temperature. The first sensor ( 17 ) is designed for the direct or indirect detection of an injection process (start of injection, end of injection and / or injection). It may in particular be a pressure sensor for detecting a current fuel pressure at or in the fuel injector (10b) and / or a force or vibration sensor for detecting an opening or closing state of the valve (FIG. 13 ) act.

In practice, various methods are known in order to determine from the course of a pressure signal or the course of a vibration or force signal different states of movement of the valve (FIG. 13 ) and / or the fuel. For example, from a falling edge in the pressure curve shortly after the start of an electrical pulse for actuating the Ventilaktuators ( 12 ) a hydraulic injection start, ie the time of the first leakage of fuel from the injection ports ( 15 ) are derived. On the other hand, from a rising edge in the pressure curve and / or an overshoot of the instantaneous fuel pressure over a pressure level, which was present before the start of a fuel injection, the hydraulic end of the Fuel injection are derived. Furthermore, an injection rate can be determined from a pressure level between the hydraulic start of injection and the hydraulic end of injection, that is to say an amount of fuel which is drawn from the one or more injection openings (per unit time). 15 ) exit. Accordingly, from the known hydraulic injection start, the (middle) injection rate and the known injection end with high accuracy, the actually injected amount of fuel can be detected. Via a force or vibration sensor, for example, the lifting of the valve ( 13 ) of a valve seat area (= hydraulic injection start) and reseating the valve ( 13 ) are detected on the valve seat area (= hydraulic injection end).

The integrated sensor system ( 16 ), the signals of the first and the second sensor ( 17 . 18 ) directly to the electronic control unit ( 50 ) to transfer. According to an alternative and preferred embodiment, the fuel injector (10b) comprises a signal transformer ( 23 ), which is designed to at least two sensor signals (P, T) of the sensor ( 16 ) into a combined transmission signal ( S1 ' ), so that the combined transmission signal ( S1 ' ) via only one line to the electronic control unit ( 50 ) is transferable. Particularly preferred is the signal transformer ( 23 ) with energy from the (integrated) energy store ( 30 ) operated. Thus, instead of two or more separate signal lines (Sl, S2) only a single line ( S1 ' ) may be provided for the combined transmission signal. Accordingly, the in 3 shown fuel injector (10b) only four electrical lines ( IV - IV + , S1 ', IS -) for connection to the electronic control unit ( 50 ), so two lines less than the fuel injector ( 10 ) according to 1 ,

In the electronic control unit ( 50 ) is preferably an evaluation unit ( 52 ), which is designed to extract from the combined transmission signal ( S1 ' ) to extract a first and a second sensor signal.

4 shows a third embodiment of the fuel injector (10c) according to the present disclosure. This has analogous to the 2 and 3 an (integrated) energy store ( 30 ) and a signal transformer ( 23 ) on. Alternatively, the fuel injector (10c) may have only one or none of the aforementioned components.

The fuel injector (10c) according to 4 is on a motor housing ( 61 ) of an internal combustion engine ( 60 ) can be arranged or provided for such an arrangement. The arrangement is preferably such that the injection section ( 11 ) and at least its distal end (with the injection openings ( 15 )) in a combustion chamber ( 62 ) of the internal combustion engine ( 60 ) enough. On the motor housing ( 61 ) may be provided a correspondingly adapted receptacle for the fuel injector (10c). Between the receptacle and the fuel injector (10c) is preferably a seal ( 63 ) arranged.

In the fuel injector (10c) according to 4 is the ground contact of the valve actuator ( 12 ) with a ground contact ( IG ) on the motor housing ( 61 ) connected. On a separate ground line ( IV -) to the electronic control unit ( 50 ) can therefore be dispensed with.

Particular preference is furthermore the seal ( 63 ) between the fuel injector (10c) and the receptacle in the motor housing ( 61 ) designed as a copper seal and thus electrically conductive. The connection of the mass contact of the valve actuator ( 12 ) can over this copper seal ( 63 ) with the ground contact ( IG ) on the motor housing ( 61 ) respectively. Alternatively or additionally, an electrical contact at the dorsal end (from the injection openings ( 15 ) facing away from the fuel injector (10c), in particular in the form of a clamp, which biases the fuel injector (10c) into the receptacle on the motor housing (10c). 61 ) presses.

The in 4 shown fuel injector (10c) thus has only three lines ( IV + . S1 ' . IS -) and thus three lines less than the fuel injector ( 10 ) according to 1 ,

5 shows a fourth embodiment of the fuel injector ( 10d ) according to the present disclosure. This example shows the features of the three previous embodiments ( 10a , 10b, 10c). He may alternatively have only one or none of the aforementioned features.

Sensor values of the sensors ( 17 . 18 ), in particular sensor values transmitted with analog signals, are often coded as the difference between an instantaneous voltage and a reference voltage. For an accurate acquisition and transmission of analog measured values, it is therefore advantageous if in the electronic control unit ( 50 ) Both the instantaneous voltage value and the reference voltage are known. In previously known fuel injectors one has for this reason a separate ground line ( IS -) for the supply energy of the sensor / sensors provided on the base potential between the electronic control unit ( 50 ) and the fuel injector ( 10 ) was transmitted as a reference voltage.

In the fuel injector ( 10d ) according to 5 becomes (also) a ground contact of the integrated sensor ( 16 ) and / or a control section ( 20 ) of the fuel injector ( 10d ) with a ground contact (IG ') of the motor housing ( 61 ) connected. This can be the same ground contact ( IG ), on which the valve actuator ( 12 ) or another ground contact ( IG ' ). As a base potential, the instantaneous potential of the motor housing ( 61 ) or the ground contact provided there ( IG / IG ' ). However, this base potential may differ from the base potential that is present at a ground contact of the electronic control unit (FIG. 50 ) is present.

The fuel injector ( 10d ) has a switching device ( 40 ), which is a transmission line ( S1 " ) alternately on the one hand with a signal line ( S1 ' ) of the integrated sensors ( 16 ) and / or the control section ( 20 ) and on the other hand with the ground contact ( IG ) on the motor housing ( 61 ), wherein the switching between the signal line ( S1 ' ) and the ground contact ( IG . IG ' ) according to a flow chart.

By the switching device ( 40 ) is achieved that in a first time proportion according to the flowchart by the electronic control unit ( 50 ) the base potential at the ground contact ( IG . IG ' ) is detectable as a reference potential. In a second time portion according to the flowchart, the same transmission line ( S1 " ) A sensor signal, in particular an instantaneous voltage can be detected, which in relation to the previously detected base potential represents a measured value or signal value, in particular an analog measured value.

The flowchart for switching can be selected as desired. Preferably, the flowchart provides that a first switching in response to a current pulse for actuating the Ventilaktuators ( 12 ) takes place, if necessary, using a time rule. It can be a rising or a falling edge of the current in the phase line ( IV + ) for the supply energy of the valve actuator ( 12 ) serve as a trigger. Alternatively or additionally, a rising or falling edge of the current in a ground line ( IV -) for the supply energy of the valve actuator ( 12 ) (in 5 not shown). There may be an immediate switchover to the trigger. Alternatively, according to the time rule, a switching delayed by a certain period of time may be provided.

The flowchart may provide that a second switching, in particular the switching back, takes place after a (further) time rule, in particular after a predetermined time interval has elapsed, which begins with the first switching.

In the example of 5 the ground contact (IS- ') of the integrated sensor system ( 16 ) via its own connection to a (second) ground contact ( IG ' ) on the motor housing ( 61 ), while the ground contact of the valve actuator ( 12 ) with a (first) ground contact ( IG ) connected is. Accordingly, one on the switching device ( 40 ) shown below switching position for establishing the connection between the electronic control unit ( 50 ) and the (second) ground contact ( IG ' ) intended. As an alternative or additional variant, the switching device ( 40 ) according to 5 an upper switching position, in which a connection to the ground contact of the Ventilaktuators ( 12 ) and thus to the (first) ground contact ( IG ) on the motor housing ( 61 ) will be produced.

Modifications of the invention are possible in various ways. In particular, all features shown, described, claimed or disclosed in any other way can be combined with one another in any desired manner.

The controller ( 21 ) and the memory ( 22 ) can take on any tasks. For example, they can be used to correct measured values or control signals as a function of the individual properties of a fuel injector ( 10a - 10d ) serve. Such individual properties can be determined, for example, by measurement at the manufacturer after production and / or by learning methods. The properties include, for example, wear-related changes in the injection behavior, in particular changes in a leakage rate of the fuel injector, an injection rate with respect to a current supply pressure, etc.

It may be advantageous to use a fuel injector ( 10a , 10b, 10c, 10d) without a control section ( 20 ) or at least part of the learning and correction tasks in the electronic control unit ( 50 ) relocate. In such a case, a fuel injector may be provided with an individual identifier. In the electronic control unit ( 50 ) can be deposited, which specific fuel injector is connected to which port. Individual properties of the fuel injector determined by the manufacturer after production can be stored in a database and interrogated by means of the individual identifier and transmitted to the electronic control unit. For example, a code (bar code / QR code) can be printed on the fuel injector, which code is read when it is attached to an internal combustion engine or when it is connected to the electronic control unit. With the help of the barcode, a database of the manufacturer can be queried to retrieve the parameters via the individual properties.

LIST OF REFERENCE NUMBERS

10

Fuel injector with six lines

10a-

Fuel injector in four variants

10d

according to the present disclosure

11

injector section

12

valve actuator

13

Valve

14

Fuel passage

15

injection port

16

sensors

17

First sensor / pressure sensor

18

Second sensor / Temp sensor

19

connector

20

control section

21

controller

22

Storage

23

signal transformer

30

energy storage

31

loader

32

regulator

40

switching device

50

Electronic control unit / ECU

51

Electric driver unit / EDU

52

evaluation

60

internal combustion engine

61

motor housing

62

combustion chamber

63

poetry

IS +

Phase line for supply energy of the control section / sensor system

IS + '

Energy storage provided (internal) supply potential

IS

Ground line for supply energy of the control section / sensor system

IV +

Phase line for supply power of the valve actuator

IV-

Ground pipe for supply power of the valve actuator

S1

Line for first signal - eg pressure

S1 '

Line for combined transmission signal

S1 "

Line for combined transmission signal and ground contact query

S2

Line for second signal / bus communication - eg Temp / LIN

IG

Ground contact on the motor housing

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014102163 [0019, 0022]

Claims (11)

Fuel injector comprising a valve (13) for releasing or ending fuel injections, an electrically controllable valve actuator (12) for actuating the valve (13) and an integrated sensor system (16), characterized in that the fuel injector (10) has an energy store (30). with a charging device (31), wherein the energy store (30) via the charging device (31) with at least one line (IV +) for the supply energy of the Ventilaktuators (12) is connected, and wherein the loading device (31) is adapted to the Energy storage (30) from the electrical currents in this line (IV +) to charge. Fuel injector after Claim 1 wherein the energy store (30) is connected by a regulator (32) to the internal sensor (16) and / or a control section (20) of the fuel injector (10), wherein the regulator (32) is adapted to deliver a regulated voltage , in particular a constant voltage. Fuel injector after Claim 1 or 2 in which the integrated sensor system (16) generates at least two sensor signals (P, T) and in particular comprises: a first sensor (17) for direct or indirect detection of an injection process, in particular a pressure sensor for detecting a current fuel pressure at or in the injector and / or or a force or vibration sensor for detecting an opening or closing state of the valve (13), and - a second sensor (18) for detecting a temperature. Fuel injector after Claim 3 in that the fuel injector (10) has a signal transformer (23) which is designed to convert at least two sensor signals (P, T) of the sensor system into a combined transmission signal (S1 '). Fuel injector after Claim 4 , wherein the signal transformer (23) is operated with energy from the energy store (30). Fuel injector according to one of the preceding claims, wherein the fuel injector (10) on a motor housing (61) of an internal combustion engine (60) can be arranged, and wherein a ground contact (IV) of the Ventilaktuators (12) is provided with a ground contact (IG) the motor housing (61) to be connected. Fuel injector according to the preamble of Claim 1 or according to one of the preceding claims, characterized in that the fuel injector (10) on an engine housing (61) of an internal combustion engine (60) can be arranged, wherein a ground contact (IS) of the integrated sensor (16) and / or a control section (20 ) of the fuel injector (10) is intended to be connected to a ground contact (IG) of the motor housing (61), and that the fuel injector (10) comprises a switching device (40) having a transmission line (S1 ") alternating with a signal line (S1 ') of the integrated sensor (16) and the ground contact (IG) connects, wherein the switching takes place according to a flowchart. Fuel injector after Claim 7 , wherein the flowchart provides that a first switching is initiated by a rising or falling edge of the current in a line (IV +) for the supply energy of the Ventilaktuators (12). Fuel injector after Claim 8 wherein the flowchart provides that a second switch occurs after a predetermined time interval has elapsed after the first switchover. Fuel supply system comprising a fuel injector according to at least one of the preceding claims and an electronic control unit, characterized in that the electronic control unit (50) comprises an evaluation unit (52), which is adapted to a combined transmission signal (S1 'and / or S1 ") to extract a first and a second sensor signal. Fuel supply system according to the preceding claim, wherein the evaluation unit (52) is adapted to detect from a combined transmission signal (S1 ") in a first signal component according to a first time portion of a sequence scheme at least one sensor value and in a second signal component according to a second time component of a sequence scheme to detect a reference value for a base potential to which the at least one sensor value is referenced.

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