EP0993395B1 - Current measurement module for an internal combustion engine starter device - Google Patents

Current measurement module for an internal combustion engine starter device Download PDF

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Publication number
EP0993395B1
EP0993395B1 EP97941788A EP97941788A EP0993395B1 EP 0993395 B1 EP0993395 B1 EP 0993395B1 EP 97941788 A EP97941788 A EP 97941788A EP 97941788 A EP97941788 A EP 97941788A EP 0993395 B1 EP0993395 B1 EP 0993395B1
Authority
EP
European Patent Office
Prior art keywords
starter
current
iron core
soft iron
magnetic field
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.)
Expired - Lifetime
Application number
EP97941788A
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German (de)
French (fr)
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EP0993395A1 (en
Inventor
Claus Kramer
Karl-Otto Schmidt
Elmar Huber
Uwe Daurer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Priority claimed from DE19730635A external-priority patent/DE19730635A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0993395A1 publication Critical patent/EP0993395A1/en
Application granted granted Critical
Publication of EP0993395B1 publication Critical patent/EP0993395B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0848—Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/04—Parameters used for control of starting apparatus said parameters being related to the starter motor
    • F02N2200/044—Starter current

Definitions

  • the invention relates to a starting device for Internal combustion engines, which have the features of the preamble of Claim 1 or 2.
  • Starter motors are usually used for this purpose via a starter relay designed as a so-called engagement relay be connected to a voltage source, and at the same time a Pinion of the starter motor with a ring gear of a flywheel Internal combustion engine is brought into engagement.
  • a starter relay designed as a so-called engagement relay be connected to a voltage source, and at the same time a Pinion of the starter motor with a ring gear of a flywheel Internal combustion engine is brought into engagement.
  • a starter relay designed as a so-called engagement relay be connected to a voltage source, and at the same time a Pinion of the starter motor with a ring gear of a flywheel Internal combustion engine is brought into engagement.
  • a starter relay designed as a so-called engagement relay be connected to a voltage source, and at the same time a Pinion of the starter motor with a ring gear of a flywheel Internal combustion engine is brought into engagement.
  • a starter relay for example an ignition switch or Start switch of the motor vehicle to control.
  • a starter current is evaluated. This takes advantage of that the starter current varies depending on the self-running the internal combustion engine changes.
  • the internal combustion engine reaches its Self-running speed, d. that is, it develops its own torque, the starter motor is almost overhauled in its speed, the Starter motor via a one-way clutch from the internal combustion engine is separated. From this point on, the starter motor only has to apply his own acceleration torque so that the Starter current drops to the no-load current of the starter motor.
  • DE 195 03 537 A1 describes a starting device for Internal combustion engines according to the preambles of claims 1 and 2 known with a a starter current Starter motor measuring current measuring module, which has a magnetic field sensor comprises, and with a controlled by the magnetic field sensor Control electronics, when a cut-off current of the Starter motor a control signal to switch off the starter motor generated.
  • the current measuring module according to the invention with those in claim 1 or 2 mentioned features offers the advantage that a Evaluation of the starter current is possible.
  • one Conductor through which the starter current flows at least partially encompassing soft iron core, which carries a magnetic field sensor, and electronics controlled by the magnetic field sensor, which at Reaching a cut-off current, in particular an idling current, the starter motor, a control signal for switching off the starter motor generated, is provided is possible in a simple manner Evaluate starter current without direct intervention in the starter motor.
  • design changes are the whole Starting device not necessary because the invention Current measuring module in a simple manner to existing starting devices is customizable.
  • the two independent claims 1 and 2 are common inventive idea based on which the current measuring module to outside the starter motor attached contacts such.
  • B. the contact pin on the starter relay or the external connection contact of the Starter motor is connected.
  • Here are either Contact pin of the starter relay or the connection contact of the Starter motor through the through hole of the soft iron core passed.
  • FIG. 1 shows the course of a starter current I of a starter motor of an internal combustion engine over time t.
  • the starter current I increases to a maximum value (starting current) and then changes into a ripple area 10.
  • the ripple of the starter current I results from the compression and decompression phases of the internal combustion engine that change during the starting phase.
  • the starter current I changes to the idle current I 0 .
  • I A denotes a cutoff current that lies below the ripple range 10. After falling below the cut-off current I A, it is certain that the internal combustion engine is self-running and the starter motor can be switched off.
  • Figure 2 illustrates that a current I flows through Head 12 generates a magnetic field B.
  • the magnetic field B is proportional to the current I.
  • a current measurement module 14 is shown in FIGS. 3a to 3c shown by means of the by detecting the magnetic field B the starter current I is measured.
  • the current measuring module 14 is a front view ( Figure 3a), a side view ( Figure 3b) and a top view ( Figure 3c) shown.
  • the current measuring module 14 comprises a sleeve-shaped Soft iron core 16.
  • the soft iron core 16 has an axial through opening 18, which is preferably is round, the diameter of which is larger than an electrical guided through the soft iron core 16 Conductor 12 (not shown in Figure 3). As a result, remains between the electrical conductor 12 and the soft iron core 16 a coaxial air gap. In this air gap there is only one indicated Magnetic field sensor 20 arranged.
  • the magnetic field sensor 20 can be, for example, a Hall sensor or be a so-called field plate.
  • the function of Magnetic field sensors 20 are generally known, so that not within the scope of the present description to be discussed in more detail.
  • a magnetic field sensor 20 has electrical connection contacts on which in Dependency of one acting on the magnetic field sensor Magnetic field B there is a signal voltage, the signal voltage being proportional to the magnetic field B is.
  • the soft iron core 16 is on one, made of a non-magnetic and electrically non-conductive material existing base plate 22 arranged for example consists of a plastic. to Arrangement of the soft iron core 16 on the base plate 22 can the soft iron core 16, for example with molded around the base plate 22 plastic so that next to the base plate 22nd at the same time the corresponding holding area 24 and a jacket 26 of the soft iron core 16 is formed.
  • the electronics can be in the base plate 22 at the same time for evaluating those supplied by the magnetic field sensor 20 Signal voltage must be integrated.
  • FIG. 4a shows a starting device in a side view 28 for an internal combustion engine, not shown a motor vehicle.
  • the starting device 28 comprises a starter motor 30 and a Engagement relay trained starter relay 32.
  • the starter relay 32 becomes the starter motor 30 with a motor vehicle battery Motor vehicle connected and on the other hand a pinion of the starter motor in engagement with the internal combustion engine brought.
  • the starter relay 32 has one Contact space 34, within which a contact bridge two Contact bolt 36 and 38 connects to each other.
  • the Contact pin 36 is a not shown electrical connection line with the positive pole of the Motor vehicle battery connected.
  • the contact pin 38 is extended so that it the one hand the current measuring module 14 and on the other hand take up a cable lug 40 can.
  • the cable lug 40 is preferably one electrical wire designed as a strand 42 with a protruding from the starter motor 30 Connection 44 connected.
  • the current measuring module 14 is with its soft iron core 16 over the contact bolt 38 pushed.
  • the arrangement of the current measuring module 14 and the cable lug 40 on the contact pin 38 is by means of a fastener 46, for example a threaded nut, locked.
  • the size of the base plate 22 of the current measuring module 14 is based on the design of the starting device 28 tuned so that an existing one anyway Installation space for receiving the current measuring module 14 can be used without constructive changes on the starting device 28 are necessary.
  • the base plate 22 of the current measuring module 14 has a - like the top view in Figure 3c shows - greater edge length 1 as an axial extension a of the soft iron core 16. This ensures that in the area b resulting from the difference in edge length 1 and the axial extent a results in Cable lug 40 can be located.
  • the arrangement of the current measuring module 14 ensures that when the starter motor 30 is switched on, the starter current I flows via the contact bolt 36, the contact bridge of the starter relay 32, the contact bolt 38, the cable lug 40, the strand 42 and the connection 44 to the starter motor 30.
  • the soft iron core 16 is integrated into this electrical connection path in that it surrounds the contact pin 38 in regions.
  • the contact pin 38 forms the electrical conductor 12, which is surrounded by a magnetic field proportional to the starter current I.
  • a control signal is supplied to control electronics 48 via lines (not shown in detail in FIG. 4a), which can be integrated, for example, in the base plate 22.
  • This control signal is proportional to the magnetic field B measured by the magnetic field sensor 16, which in turn is proportional to the starter current I. Corresponding to the switch-off limit of starter current I explained with reference to FIG. 1, a drop below switch-off current I A is thus detected. If the value falls below I A , the control electronics 48 provides a control signal for switching off the starter motor 30. This control signal causes an opening of a switching means connecting the starter relay 32 with a control voltage, so that the contact bridge of the starter relay 32 separates the contact bolts 36 and 38.
  • the current measuring module 14 must have a construction the starting device 28 and an assembly of the starting device 28 not changed in motor vehicles be, so that the cost advantages of a large series production remain. If applicable, is a only around the axial extension a of the soft iron core 16 to use extended contact pin 38.
  • the electrical connection lines to Starting device 28 in motor vehicles must also cannot be changed. It's just an additional one Connection line from the control electronics 48 to a shutdown device of the starting device 28 necessary.
  • the current measuring module 14 on the one hand at already in Operation of motor vehicles in simpler Can be retrofitted.
  • FIGS. 4b and 4c Views of the arrangement of the current measuring module 14 on the Contact pin 38 shown. Especially the front view 4b shows that the control electronics 48 receiving base plate 22 in one free installation space between the relay cover of the Starter relay 32 and the starter motor 30 can be integrated is. Otherwise, the same parts are the same Provide reference numerals and not explained again.
  • FIG Arrangement of a current measuring module 14 on a starting device 28 shown. Same parts as in the previous ones Figures, in particular as in Figure 4a provided with the same reference numerals and not again explained.
  • this is Current measuring module 14 on a housing 50, in particular a commutator cover 52, the starter motor 30.
  • the electric one Terminal 44 consists of a busbar 54, from inside a pole tube of the starter motor 12 protrudes.
  • the electrical connecting line (strand) 42 with their cable lug 40 firmly connected in an electrically conductive manner, for example welded on.
  • FIG. 5 shows the arrangement of the current measuring module 14 when assembling the soft iron core 16 from the the starter motor 30 protruding busbar 54 be, the electrical conductive connection between the busbar 54 and the connecting line 42 is produced.
  • the soft iron core 16 thus virtually protrudes from the Control electronics 48 having a base plate axially out and engages around the busbar 54. Between the Busbar 54 and the soft iron core 16 is the Magnetic field sensor 20, not shown here.
  • the busbar 54 thus forms the one in FIG. 2 with 12 designated electrical conductor. According to the in Figure 5 embodiment shown is the soft iron core 16 not annular, but this extends from the base plate 22, oval. For the detection of the magnetic field B and thus the starter current I has no influence.
  • the mounting of the base plate 22 with the control electronics 48 on the commutator cover 52 can for example via suitable snap-in, plug-in or Screw connections are made.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

A current measurement module for an internal combustion engine, comprising a unit for measuring a starter current. According to the invention, a soft-iron core (16) at least partially enclosing a conductor (12) with a starter current (I) flowing therethrough includes a magnetic field sensor (20). Furthermore, an electronic control system (48) driven by said magnetic field sensor generates a control signal for switching off the starter device (30) when a cut-off current (IA) of said starter device (30) is reached.

Description

Die Erfindung betrifft eine Starteinrichtung für Brennkraftmaschinen, welche die Merkmale des Oberbegriffs des Anspruchs 1 bzw. 2 aufweist.The invention relates to a starting device for Internal combustion engines, which have the features of the preamble of Claim 1 or 2.

Stand der TechnikState of the art

Es ist bekannt, dass Brennkraftmaschinen mittels einer Startvorrichtung gestartet werden müssen, da diese nicht von alleine anlaufen. Hierzu werden üblicherweise Startermotoren eingesetzt, die über ein als sogenanntes Einrückrelais ausgebildetes Starterrelais mit einer Spannungsquelle verbunden werden, und gleichzeitig ein Ritzel des Startermotors mit einem Zahnkranz eines Schwungrades der Brennkraftmaschine zum Andrehen in Eingriff gebracht wird. Zum Einschalten des Starterrelais ist es bekannt, dieses über einen externen Schalter, beispielsweise einen Zündschalter oder Startschalter des Kraftfahrzeugs, anzusteuern. Nach Erreichen des Selbstlaufs der Brennkraftmaschine muß der Startermotor ausgespurt werden, um einer Geräuschentwicklung und einem Verschleiß vorzubeugen. Bekannt ist eine manuelle Startabschaltung, durch Loslassen des Zünd- bzw. Startschalters. Um eine Komforterhöhung in Kraftfahrzeugen zu erreichen, sind Lösungen bekannt, eine automatische Startabschaltung der Brennkraftmaschine durchzuführen. Um einen Selbstlauf der Brennkraftmaschine zu detektieren, kann eine Auswertung eines Starterstroms erfolgen. Hierbei wird ausgenutzt, dass der Starterstrom seinen Verlauf in Abhängigkeit des Selbstlaufs der Brennkraftmaschine ändert. Erreicht die Brennkraftmaschine ihre Selbstlaufdrehzahl, d. h., diese entwickelt ein eigenes Drehmoment, wird der Startermotor in seiner Drehzahl quasi überholt, wobei der Startermotor über eine Freilaufkupplung von der Brennkraftmaschine getrennt wird. Ab diesem Zeitpunkt muß der Startermotor nur noch sein eigenes Beschleunigungsmoment aufbringen, so dass der Starterstrom auf den Leerlaufstrom des Startermotors abfällt. Das Erreichen des Leerlaufstroms des Startermotors signalisiert somit den Selbstlauf der Brennkraftmaschine.It is known that internal combustion engines by means of a Starting device must be started, as this does not happen by itself start. Starter motors are usually used for this purpose via a starter relay designed as a so-called engagement relay be connected to a voltage source, and at the same time a Pinion of the starter motor with a ring gear of a flywheel Internal combustion engine is brought into engagement. To the It is known to switch on the starter relay via a external switch, for example an ignition switch or Start switch of the motor vehicle to control. After reaching the The starter motor must be disengaged from the internal combustion engine to reduce noise and wear submissions. A manual start shutdown is known by Let go of the ignition or start switch. To increase comfort in To reach motor vehicles, solutions are known, one perform automatic start shutdown of the internal combustion engine. In order to detect self-running of the internal combustion engine, one can A starter current is evaluated. This takes advantage of that the starter current varies depending on the self-running the internal combustion engine changes. The internal combustion engine reaches its Self-running speed, d. that is, it develops its own torque, the starter motor is almost overhauled in its speed, the Starter motor via a one-way clutch from the internal combustion engine is separated. From this point on, the starter motor only has to apply his own acceleration torque so that the Starter current drops to the no-load current of the starter motor. The Signaling when the starter motor reaches idling current the self-running of the internal combustion engine.

Aus der allgemeinen Elektrotechnik ist bekannt, dass ein von einem Strom durchflossener Leiter von einem dem Strom proportionalen Magnetfeld umgeben ist.It is known from general electrical engineering that one of one Conductor through which current flows from a conductor proportional to the current Magnetic field is surrounded.

Aus der DE 195 03 537 A1 ist eine Starteinrichtung für Brennkraftmaschinen gemäß den Oberbegriffen des Ansprüche 1 und 2 bekannt mit einem einen Starterstrom eines Startermotors messenden Strommeßmodul, das einen Magnetfeldsensor umfaßt, und mit einer von dem Magnetfeldsensor angesteuerten Steuerelektronik, die bei Erreichen eines Abschaltstroms des Startermotors ein Steuersignal zum Abschalten des Startermotors generiert.DE 195 03 537 A1 describes a starting device for Internal combustion engines according to the preambles of claims 1 and 2 known with a a starter current Starter motor measuring current measuring module, which has a magnetic field sensor comprises, and with a controlled by the magnetic field sensor Control electronics, when a cut-off current of the Starter motor a control signal to switch off the starter motor generated.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Strommeßmodul mit den im Anspruch 1 oder 2 genannten Merkmalen bietet den Vorteil, dass in einfacher Weise eine Auswertung des Starterstroms möglich ist. Dadurch, dass ein einen vom Starterstrom durchflossenen Leiter zumindest teilweise umgreifender Weicheisenkern, der einen Magnetfeldsensor trägt, und eine von dem Magnetfeldsensor angesteuerte Elektronik, die bei Erreichen eines Abschaltstroms, insbesondere eines Leerlaufstroms, des Startermotors ein Steuersignal zum Abschalten des Startermotors generiert, vorgesehen ist, ist in einfacher Weise möglich, den Starterstrom ohne direkten Eingriff in den Startermotor auszuwerten. Insbesondere sind konstruktive Änderungen der gesamten Starteinrichtung nicht notwendig, da das erfindungsgemäße Strommeßmodul in einfacher Weise an bestehende Starteinrichtungen anpaßbar ist. Darüber hinaus sind keinerlei Veränderungen an den vorhandenen elektrischen Verbindungsleitungen der Starteinrichtung notwendig. The current measuring module according to the invention with those in claim 1 or 2 mentioned features offers the advantage that a Evaluation of the starter current is possible. In that one Conductor through which the starter current flows at least partially encompassing soft iron core, which carries a magnetic field sensor, and electronics controlled by the magnetic field sensor, which at Reaching a cut-off current, in particular an idling current, the starter motor, a control signal for switching off the starter motor generated, is provided, is possible in a simple manner Evaluate starter current without direct intervention in the starter motor. In particular, design changes are the whole Starting device not necessary because the invention Current measuring module in a simple manner to existing starting devices is customizable. In addition, there are no changes to the existing electrical connecting lines of the starting device necessary.

Den beiden unabhängigen Ansprüchen 1 und 2 liegt die gemeinsame erfinderische Idee zugrunde, wonach das Strommeßmodul an außerhalb des Startermotors befestigten Kontakten, wie z. B. dem Kontaktbolzen am Starterrelais oder dem außen liegenden Anschlußkontakt des Startermotors angeschlossen ist. Dabei sind entweder der Kontaktbolzen des Starterrelais oder der Anschlußkontakt des Startermotors durch die Durchgangsöffnung des Weicheisenkerns hindurchgeführt.The two independent claims 1 and 2 are common inventive idea based on which the current measuring module to outside the starter motor attached contacts such. B. the contact pin on the starter relay or the external connection contact of the Starter motor is connected. Here are either Contact pin of the starter relay or the connection contact of the Starter motor through the through hole of the soft iron core passed.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den in den Unteransprüchen genannten Merkmalen.Advantageous embodiments of the invention result from the in the features mentioned in the subclaims.

Zeichnungdrawing

Die Erfindung wird nachfolgend in Ausführungsbeispielen anhand der zugehörigen Zeichnungen näher erläutert. Es zeigen:

Figur 1
den Verlauf des Starterstrom eines Startermotors;
Figur 2
schematisch ein einen stromdurchflossenen Leiter umgebendes Magnetfeld;
Figur 3a bis 3c
schematische Ansichten eines Strommeßmoduls;
Figur 4a bis 4c
eine Anordnungsmöglichkeit des Strommeßmoduls an einer Starteinrichtung und
Figur 5
eine weitere Anordnungsmöglichkeit des Strommeßmoduls an einer Starteinrichtung.
The invention is explained in more detail below in exemplary embodiments with reference to the associated drawings. Show it:
Figure 1
the course of the starter current of a starter motor;
Figure 2
schematically a magnetic field surrounding a current-carrying conductor;
Figure 3a to 3c
schematic views of a current measuring module;
Figure 4a to 4c
a possibility of arranging the current measuring module on a starting device and
Figure 5
a further possibility of arranging the current measuring module on a starting device.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Figur 1 ist der Verlauf eines Starterstroms I eines Startermotors einer Brennkraftmaschine über der Zeit t gezeigt. Mit Einschalten des Startermotors steigt der Starterstrom I auf einen Maximalwert (Anlaufstrom) an und geht anschließend in einen Welligkeitsbereich 10 über. Die Welligkeit des Starterstroms I ergibt sich aus den während der Startphase wechselnden Kompressions- und Dekompressionsphasen der Brennkraftmaschine. Mit Erreichen des Selbstlaufs der Brennkraftmaschine geht der Starterstrom I in den Leerlaufstrom I0 über. Mit IA ist ein Abschaltstrom gekennzeichnet, der unterhalb des Welligkeitsbereichs 10 liegt. Nach Unterschreiten des Abschaltstroms IA ist sicher, daß die Brennkraftmaschine im Selbstlauf ist und eine Abschaltung des Startermotors erfolgen kann.FIG. 1 shows the course of a starter current I of a starter motor of an internal combustion engine over time t. When the starter motor is switched on, the starter current I increases to a maximum value (starting current) and then changes into a ripple area 10. The ripple of the starter current I results from the compression and decompression phases of the internal combustion engine that change during the starting phase. When the internal combustion engine reaches self-running, the starter current I changes to the idle current I 0 . I A denotes a cutoff current that lies below the ripple range 10. After falling below the cut-off current I A, it is certain that the internal combustion engine is self-running and the starter motor can be switched off.

Figur 2 verdeutlicht, daß ein vom Strom I durchflossener Leiter 12 ein Magnetfeld B erzeugt. Das Magnetfeld B ist hierbei dem Strom I proportional. Figure 2 illustrates that a current I flows through Head 12 generates a magnetic field B. The magnetic field B is proportional to the current I.

In den Figuren 3a bis 3c ist ein Strommeßmodul 14 gezeigt, mittels dem durch Erfassen des Magnetfelds B der Starterstrom I gemessen wird. Das Strommeßmodul 14 ist in einer Vorderansicht (Figur 3a), einer Seitenansicht (Figur 3b) und einer Draufsicht (Figur 3c) gezeigt. Das Strommeßmodul 14 umfaßt einen hülsenförmigen Weicheisenkern 16. Der Weicheisenkern 16 besitzt eine axiale Durchgangsöffnung 18, die vorzugsweise rund ist, deren Durchmesser größer ist als ein durch den Weicheisenkern 16 geführter elektrischer Leiter 12 (in Figur 3 nicht dargestellt). Hierdurch verbleibt zwischen dem elektrischen Leiter 12 und dem Weicheisenkern 16 ein koaxialer Luftspalt. In diesem Luftspalt ist ein hier lediglich angedeuteter Magnetfeldsensor 20 angeordnet. Der Magnetfeldsensor 20 kann beispielsweise ein Hallsensor oder eine sogenannte Feldplatte sein. Die Funktion von Magnetfeldsensoren 20 ist allgemein bekannt, so daß im Rahmen der vorliegenden Beschreibung hierauf nicht näher eingegangen werden soll. Ein Magnetfeldsensor 20 besitzt elektrische Anschlußkontakte, an denen in Abhängigkeit eines auf den Magnetfeldsensor einwirkenden Magnetfeldes B eine Signalspannung anliegt, wobei die Signalspannung proportional zu dem Magnetfeld B ist.A current measurement module 14 is shown in FIGS. 3a to 3c shown by means of the by detecting the magnetic field B the starter current I is measured. The current measuring module 14 is a front view (Figure 3a), a side view (Figure 3b) and a top view (Figure 3c) shown. The current measuring module 14 comprises a sleeve-shaped Soft iron core 16. The soft iron core 16 has an axial through opening 18, which is preferably is round, the diameter of which is larger than an electrical guided through the soft iron core 16 Conductor 12 (not shown in Figure 3). As a result, remains between the electrical conductor 12 and the soft iron core 16 a coaxial air gap. In this air gap there is only one indicated Magnetic field sensor 20 arranged. The magnetic field sensor 20 can be, for example, a Hall sensor or be a so-called field plate. The function of Magnetic field sensors 20 are generally known, so that not within the scope of the present description to be discussed in more detail. A magnetic field sensor 20 has electrical connection contacts on which in Dependency of one acting on the magnetic field sensor Magnetic field B there is a signal voltage, the signal voltage being proportional to the magnetic field B is.

Der Weicheisenkern 16 ist auf einer, aus einem unmagnetischen und elektrisch nicht leitfähigen Material bestehenden Grundplatte 22 angeordnet, die beispielsweise aus einem Kunststoff besteht. Zur Anordnung des Weicheisenkerns 16 auf der Grundplatte 22 kann der Weicheisenkern 16 beispielsweise mit einem die Grundplatte 22 ergebenden Kunststoff umspritzt werden, so daß neben der Grundplatte 22 gleichzeitig der entsprechende Haltebereich 24 sowie eine Ummantelung 26 des Weicheisenkerns 16 entsteht. In die Grundplatte 22 kann gleichzeitig die Elektronik zur Auswertung der vom Magnetfeldsensor 20 gelieferten Signalspannung integriert sein.The soft iron core 16 is on one, made of a non-magnetic and electrically non-conductive material existing base plate 22 arranged for example consists of a plastic. to Arrangement of the soft iron core 16 on the base plate 22 can the soft iron core 16, for example with molded around the base plate 22 plastic so that next to the base plate 22nd at the same time the corresponding holding area 24 and a jacket 26 of the soft iron core 16 is formed. The electronics can be in the base plate 22 at the same time for evaluating those supplied by the magnetic field sensor 20 Signal voltage must be integrated.

Figur 4a zeigt in einer Seitenansicht eine Starteinrichtung 28 für eine nicht dargestellte Brennkraftmaschine eines Kraftfahrzeugs. Die Starteinrichtung 28 umfaßt einen Startermotor 30 sowie ein als Einrückelrelais ausgebildetes Starterrelais 32. Mittels des Starterrelais 32 wird einerseits der Startermotor 30 mit einer Kraftfahrzeugbatterie des Kraftfahrzeugs verbunden und andererseits ein Ritzel des Startermotors in Eingriff mit der Brennkraftmaschine gebracht. Das Starterrelais 32 besitzt einen Kontaktraum 34, innerhalb dem eine Kontaktbrücke zwei Kontaktbolzen 36 und 38 miteinander verbindet. Der Kontaktbolzen 36 ist über eine nicht dargestellte elektrische Verbindungsleitung mit dem Pluspol der Kraftfahrzeugbatterie verbunden. Der Kontaktbolzen 38 ist derart verlängert, daß er einerseits das Strommeßmodul 14 und andererseits einen Kabelschuh 40 aufnehmen kann. Der Kabelschuh 40 ist mit einer vorzugsweise als Litze ausgebildeten elektrischen Leitung 42 mit einem aus dem Startermotor 30 herausragenden Anschluß 44 verbunden. Das Strommeßmodul 14 ist mit seinem Weicheisenkern 16 über den Kontaktbolzen 38 geschoben. Die Anordnung des Strommeßmoduls 14 und des Kabelschuhs 40 auf dem Kontaktbolzen 38 wird mittels eines Befestigungsmittels 46, beispielsweise einer Gewindemutter, arretiert.FIG. 4a shows a starting device in a side view 28 for an internal combustion engine, not shown a motor vehicle. The starting device 28 comprises a starter motor 30 and a Engagement relay trained starter relay 32. By means of the starter relay 32 becomes the starter motor 30 with a motor vehicle battery Motor vehicle connected and on the other hand a pinion of the starter motor in engagement with the internal combustion engine brought. The starter relay 32 has one Contact space 34, within which a contact bridge two Contact bolt 36 and 38 connects to each other. The Contact pin 36 is a not shown electrical connection line with the positive pole of the Motor vehicle battery connected. The contact pin 38 is extended so that it the one hand the current measuring module 14 and on the other hand take up a cable lug 40 can. The cable lug 40 is preferably one electrical wire designed as a strand 42 with a protruding from the starter motor 30 Connection 44 connected. The current measuring module 14 is with its soft iron core 16 over the contact bolt 38 pushed. The arrangement of the current measuring module 14 and the cable lug 40 on the contact pin 38 is by means of a fastener 46, for example a threaded nut, locked.

Die Größe der Grundplatte 22 des Strommeßmoduls 14 ist auf die konstruktiven Gegebenheiten der Starteinrichtung 28 abgestimmt, so daß ein sowieso vorhandener Einbauraum für die Aufnahme des Strommeßmoduls 14 genutzt werden kann, ohne daß konstruktive Änderungen an der Starteinrichtung 28 notwendig sind. Die Grundplatte 22 des Strommeßmoduls 14 besitzt eine - wie die Draufsicht in Figur 3c zeigt - größere Kantenlänge 1 als eine axiale Erstreckung a des Weicheisenkerns 16. Hierdurch wird erreicht, daß sich in dem Bereich b, der sich aus der Differenz der Kantenlänge 1 und der axialen Erstreckung a ergibt, der Kabelschuh 40 befinden kann.The size of the base plate 22 of the current measuring module 14 is based on the design of the starting device 28 tuned so that an existing one anyway Installation space for receiving the current measuring module 14 can be used without constructive changes on the starting device 28 are necessary. The base plate 22 of the current measuring module 14 has a - like the top view in Figure 3c shows - greater edge length 1 as an axial extension a of the soft iron core 16. This ensures that in the area b resulting from the difference in edge length 1 and the axial extent a results in Cable lug 40 can be located.

Durch die gefundene Anordnung des Strommeßmoduls 14 wird erreicht, daß bei eingeschaltetem Startermotor 30 der Starterstrom I über den Kontaktbolzen 36, die Kontaktbrücke des Starterrelais 32, den Kontaktbolzen 38, den Kabelschuh 40, die Litze 42 und den Anschluß 44 zum Startermotor 30 fließt. In diesen elektrischen Verbindungsweg ist der Weicheisenkern 16 eingebunden, indem dieser den Kontaktbolzen 38 bereichsweise umgibt. In Analogie zu Figur 2 bildet der Kontaktbolzen 38 den elektrischen Leiter 12, der von einem dem Starterstrom I proportionalen Magnetfeld umgeben ist. Entsprechend dem mit dem Magnetfeldsensor 16 detektierten Magnetfeld B wird ein Steuersignal über, in Figur 4a nicht detailliert dargestellte, Leitungen einer Steuerelektronik 48 zugeführt, die beispielsweise in die Grundplatte 22 integriert sein kann. Dieses Steuersignal ist proportional dem von dem Magnetfeldsensor 16 gemessenen Magnetfeld B, das wiederum proportional dem Starterstrom I ist. Entsprechend der anhand von Figur 1 erläuterten Abschaltgrenze des Starterstroms I wird ein Unterschreiten des Abschaltstroms IA somit detektiert. Wird der Wert IA unterschritten, stellt die Steuerelektronik 48 ein Steuersignal zum Abschalten des Startermotors 30 zur Verfügung. Dieses Steuersignal bewirkt ein Öffnen eines das Starterrelais 32 mit einer Steuerspannung verbindenden Schaltmittels, so daß die Kontaktbrücke des Starterrelais 32 die Kontaktbolzen 36 und 38 trennt.The arrangement of the current measuring module 14 that is found ensures that when the starter motor 30 is switched on, the starter current I flows via the contact bolt 36, the contact bridge of the starter relay 32, the contact bolt 38, the cable lug 40, the strand 42 and the connection 44 to the starter motor 30. The soft iron core 16 is integrated into this electrical connection path in that it surrounds the contact pin 38 in regions. Analogously to FIG. 2, the contact pin 38 forms the electrical conductor 12, which is surrounded by a magnetic field proportional to the starter current I. Corresponding to the magnetic field B detected with the magnetic field sensor 16, a control signal is supplied to control electronics 48 via lines (not shown in detail in FIG. 4a), which can be integrated, for example, in the base plate 22. This control signal is proportional to the magnetic field B measured by the magnetic field sensor 16, which in turn is proportional to the starter current I. Corresponding to the switch-off limit of starter current I explained with reference to FIG. 1, a drop below switch-off current I A is thus detected. If the value falls below I A , the control electronics 48 provides a control signal for switching off the starter motor 30. This control signal causes an opening of a switching means connecting the starter relay 32 with a control voltage, so that the contact bridge of the starter relay 32 separates the contact bolts 36 and 38.

Insgesamt wird ohne großen konstruktiven Aufwand mittels eines einfach aufgebauten Strommeßmoduls eine automatische Abschaltung der Starteinrichtung 28, insbesondere des Startermotors 30, bei Erreichen des Selbstlaufs der Brennkraftmaschine möglich. Zur Anordnung des Strommeßmoduls 14 muß eine Konstruktion der Starteinrichtung 28 und eine Montage der Starteinrichtung 28 in Kraftfahrzeugen nicht verändert werden, so daß die Kostenvorteile einer Großserienfertigung erhalten bleiben. Gegebenenfalls ist ein lediglich um die axiale Erstreckung a des Weicheisenkerns 16 verlängerter Kontaktbolzen 38 einzusetzen. Die elektrischen Verbindungsleitungen zur Starteinrichtung 28 in Kraftfahrzeugen muß ebenfalls nicht verändert werden. Es ist lediglich eine zusätzliche Verbindungsleitung von der Steuerelektronik 48 zu einer Abschalteinrichtung der Starteinrichtung 28 notwendig. Durch die gefundene Anordnung ist darüber hinaus das Strommeßmodul 14 einerseits bei bereits in Betrieb befindlichen Kraftfahrzeugen in einfacher Weise nachrüstbar. Darüber hinaus ist ein Austausch des Strommeßmoduls 14 im Bedarfsfalle ebenfalls ohne weiteres möglich, ohne daß die Starteinrichtung 28 insgesamt demontiert zu werden braucht. Durch den einfachen und universellen Aufbau des Strommeßmoduls 14 ist dieses bei einer Vielzahl unterschiedlicher Typen von Starteinrichtungen 28 einsetzbar, so daß eine entsprechende Bereitstellung beziehungsweise Vorhaltung unterschiedlicher Strommeßmodule 14 nicht notwendig ist. Die Dimensionierung der Kontaktbolzen, insbesondere des Kontaktbolzens 38, ist bei allen sich im Einsatz befindlichen Starteinrichtungen 28 im wesentlichen gleich, so daß auch hier keine Anpassung des Strommeßmoduls 14, insbesondere der Durchgangsöffnung 18 des Weicheisenkerns 16, an unterschiedliche Starteinrichtungen 28 erfolgen muß.Overall, without great design effort by means of a simply constructed current measuring module automatic shutdown of the starting device 28, in particular the starter motor 30, when the Self-running of the internal combustion engine possible. For arrangement the current measuring module 14 must have a construction the starting device 28 and an assembly of the starting device 28 not changed in motor vehicles be, so that the cost advantages of a large series production remain. If applicable, is a only around the axial extension a of the soft iron core 16 to use extended contact pin 38. The electrical connection lines to Starting device 28 in motor vehicles must also cannot be changed. It's just an additional one Connection line from the control electronics 48 to a shutdown device of the starting device 28 necessary. The arrangement found is above addition, the current measuring module 14 on the one hand at already in Operation of motor vehicles in simpler Can be retrofitted. There is also an exchange of the current measuring module 14 also if necessary without further possible without the starting device 28 needs to be dismantled overall. By the simple and universal structure of the current measuring module 14 this is with a variety of different Types of starting devices 28 can be used so that a corresponding provision or Provision of different current measuring modules 14 not necessary is. The dimensioning of the contact bolts, especially the contact pin 38 is common to all are in use starting devices 28 in essentially the same, so that here too no adjustment of the current measuring module 14, in particular the through opening 18 of the soft iron core 16, to different Starting devices 28 must be done.

In den Figuren 4b und 4c sind nochmals verschiedene Ansichten der Anordnung des Strommeßmoduls 14 auf dem Kontaktbolzen 38 gezeigt. Insbesondere die Stirnansicht gemäß Figur 4b zeigt, daß die die Steuerelektronik 48 aufnehmende Grundplatte 22 in einen freien Einbauraum zwischen dem Relaisdeckel des Starterrelais 32 und dem Startermotor 30 integrierbar ist. Im übrigen sind gleiche Teile mit gleichen Bezugszeichen versehen und nicht nochmals erläutert.Various are again shown in FIGS. 4b and 4c Views of the arrangement of the current measuring module 14 on the Contact pin 38 shown. Especially the front view 4b shows that the control electronics 48 receiving base plate 22 in one free installation space between the relay cover of the Starter relay 32 and the starter motor 30 can be integrated is. Otherwise, the same parts are the same Provide reference numerals and not explained again.

In Figur 5 ist eine weitere Ausführungsvariante der Anordnung eines Strommeßmoduls 14 an einer Starteinrichtung 28 gezeigt. Gleiche Teile wie in den vorhergehenden Figuren, insbesondere wie in Figur 4a, sind mit gleichen Bezugszeichen versehen und nicht nochmals erläutert.A further embodiment variant of FIG Arrangement of a current measuring module 14 on a starting device 28 shown. Same parts as in the previous ones Figures, in particular as in Figure 4a provided with the same reference numerals and not again explained.

Bei der hier gezeigten Ausführungsvariante ist das Strommeßmodul 14 an einem Gehäuse 50, insbesondere einem Kommutatordeckel 52, des Startermotors 30 angeordnet. Hierdurch wird erreicht, daß das Strommeßmodul 14 in der Nähe des elektrischen Anschlusses 44 des Startermotors 30 angeordnet ist. Der elektrische Anschluß 44 besteht aus einer Stromschiene 54, die aus dem Innern eines Polrohrs des Startermotors 12 herausragt. An diese Stromschiene 54 wird die elektrische Verbindungsleitung (Litze) 42 mit ihrem Kabelschuh 40 elektrisch leitend fest angeschlossen, beispielsweise angeschweißt. Durch die in Figur 5 gezeigte Anordnung des Strommeßmoduls 14 kann bei der Montage der Weicheisenkern 16 über die aus dem Startermotor 30 herausragende Stromschiene 54 geschoben werden, wobei nachfolgend die elektrisch leitende Verbindung zwischen der Stromschiene 54 und der Verbindungsleitung 42 hergestellt wird.In the variant shown here, this is Current measuring module 14 on a housing 50, in particular a commutator cover 52, the starter motor 30. This ensures that the current measuring module 14 near the electrical connection 44 of the starter motor 30 is arranged. The electric one Terminal 44 consists of a busbar 54, from inside a pole tube of the starter motor 12 protrudes. At this busbar 54 is the electrical connecting line (strand) 42 with their cable lug 40 firmly connected in an electrically conductive manner, for example welded on. By in FIG. 5 shows the arrangement of the current measuring module 14 when assembling the soft iron core 16 from the the starter motor 30 protruding busbar 54 be, the electrical conductive connection between the busbar 54 and the connecting line 42 is produced.

Der Weicheisenkern 16 ragt somit quasi von der die Steuerelektronik 48 aufweisenden Grundplatte axial heraus und umgreift die Stromschiene 54. Zwischen der Stromschiene 54 und dem Weicheisenkern 16 ist der, hier nicht dargestellte, Magnetfeldsensor 20 angeordnet. Die Stromschiene 54 bildet somit den in Figur 2 mit 12 bezeichneten elektrischen Leiter. Gemäß dem in Figur 5 gezeigten Ausführungsbeispiel ist der Weicheisenkern 16 nicht ringförmig ausgebildet, sondern dieser verläuft, sich von der Grundplatte 22 erstreckend, oval. Für die Detektion des Magnetfeldes B und somit den Starterstrom I hat dies keinen Einfluß. Die Befestigung der Grundplatte 22 mit der Steuerelektronik 48 an dem Kommutatordeckel 52 kann beispielsweise über geeignete Rast-, Steck- oder Schraubverbindungen erfolgen.The soft iron core 16 thus virtually protrudes from the Control electronics 48 having a base plate axially out and engages around the busbar 54. Between the Busbar 54 and the soft iron core 16 is the Magnetic field sensor 20, not shown here. The busbar 54 thus forms the one in FIG. 2 with 12 designated electrical conductor. According to the in Figure 5 embodiment shown is the soft iron core 16 not annular, but this extends from the base plate 22, oval. For the detection of the magnetic field B and thus the starter current I has no influence. The mounting of the base plate 22 with the control electronics 48 on the commutator cover 52 can for example via suitable snap-in, plug-in or Screw connections are made.

Claims (8)

  1. Starter device for internal combustion engines having a current measuring module (14) which measures a starter current of a starter motor (30) and which comprises a magnetic field sensor (20), and having an electronic control system (48) which is actuated by the magnetic field sensor (20) and which, when a switch-off current (IA) of the starter motor (30) is reached, generates a control signal for switching off the starter motor (30), characterized in that the current measuring module (14) comprises a soft iron core (16) which at least partially engages around a conductor (12) through which the starter current (I) flows, the soft iron core (16) having a through-opening (18) which is larger than the conductor (38) through which the starter current flows so that a coaxial annular gap remains between the soft iron core (16) and the conductor (38) in which the magnetic field sensor (20) is arranged, the conductor (12) through which the current flows being formed by a contact bolt (38) of a starter relay (32) of the starter device (28).
  2. Starter device for internal combustion engines having a current measuring module (14) which measures a starter current of a starter motor (30) and which comprises a magnetic field sensor (20), and having an electronic control system (48) which is actuated by the magnetic field sensor (20) and which, when a switch-off current (IA) of the starter motor (30) is reached, generates a control signal for switching off the starter motor (30), characterized in that the current measuring module (14) comprises a soft iron core (16) which at least partially engages around a conductor (12) through which the starter current (I) flows, the soft iron core (16) having a through-opening (18) which is larger than the conductor (38) through which the starter current flows so that a coaxial annular gap remains between the soft iron core (16) and the conductor (38) in which the magnetic field sensor (20) is arranged, the conductor (12) being formed by a connecting contact (44) of the starter motor (30).
  3. Starter device according to Claim 1, characterized in that the current measuring module (14) is locked by means of an attachment means (46) which simultaneously clamps an electrical connection between the contact bolt (38) of the starter relay (32) and the electrical connecting contact (44) of the starter motor (30).
  4. Starter device according to Claim 2, characterized in that the current measuring module (14) is arranged on a housing (50), in particular a commutator cover (52), of the starter motor (30).
  5. Starter device according to Claim 4, characterized in that the current measuring module (14) is equipped with a base plate (22) on the commutator cover (52), the soft iron core (16) projecting axially from the base plate (22) and engaging around a bus bar (54) which forms the connecting contact (44) and projects beyond the housing (50).
  6. Starter device according to one of the preceding claims, characterized in that the soft iron core (16) is arranged on the base plate (22) into which the electronic control system (48) is simultaneously integrated.
  7. Starter device according to one of the preceding claims, characterized in that the base plate (22) forms a securing region (24) for holding the soft iron core (16), the base plate (22), securing region (24) and an enclosure (26) around the soft iron core (16) being composed of a plastic injection-moulded part.
  8. Starter device according to one of the preceding claims, characterized in that a no-load current (I0) of the starter motor (30) is sensed as switch-off current (IA).
EP97941788A 1997-07-17 1997-08-12 Current measurement module for an internal combustion engine starter device Expired - Lifetime EP0993395B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19730635 1997-07-17
DE19730635A DE19730635A1 (en) 1996-07-24 1997-07-17 Flow measurement module for motor vehicle IC engine starter
PCT/DE1997/001713 WO1999003709A1 (en) 1997-07-17 1997-08-12 Current measurement module for an internal combustion engine starter device

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EP0993395A1 EP0993395A1 (en) 2000-04-19
EP0993395B1 true EP0993395B1 (en) 2002-11-27

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WO2002003082A1 (en) * 2000-07-06 2002-01-10 Infineon Technologies Ag Current sensor and use thereof
JP2005218219A (en) * 2004-01-29 2005-08-11 Mitsubishi Electric Corp Hall ic current sensor for in-vehicle power converter
DE102006032763B4 (en) * 2006-07-14 2009-05-07 Lisa Dräxlmaier GmbH Apparatus and method for measuring a current flowing in an electrical conductor
FR2931241B1 (en) * 2008-05-16 2010-05-28 Electricite De France METHOD AND DEVICE FOR DETECTING DEPOSITS COMPRISING AT LEAST ONE FERROMAGNETIC MATERIAL ON OR NEAR THE OUTER WALL OF A TUBE
DE102009027828A1 (en) * 2009-07-20 2011-01-27 Robert Bosch Gmbh Control and method of a starter motor for a starting device
JP6364897B2 (en) 2014-04-02 2018-08-01 株式会社デンソー Engine starter
EP3089271B1 (en) * 2015-04-29 2020-03-11 Nexans Process and arrangement for mounting a cable lug

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CH676646A5 (en) * 1990-01-26 1991-02-15 Landis & Gyr Betriebs Ag Magnetic field sensor for detection of current - provides proportional voltage for processor providing calibrated output
IT1263110B (en) * 1992-03-24 1996-07-30 Magneti Marelli Spa STARTING SYSTEM FOR AN INTERNAL COMBUSTION AND SOLENOID ENGINE USABLE IN SUCH STARTING SYSTEM
JPH0654463A (en) * 1992-07-29 1994-02-25 Mitsubishi Electric Corp Electronic controller for vehicle
JP3286446B2 (en) * 1993-12-29 2002-05-27 住友特殊金属株式会社 DC current sensor
DE19503537A1 (en) * 1995-02-03 1996-08-08 Bosch Gmbh Robert Control circuit for motor vehicle IC engine starter motor
US5622148A (en) * 1995-12-04 1997-04-22 Ford Motor Company Control for a motor vehicle cranking system
FR2745336B1 (en) * 1996-02-28 1998-05-07 Valeo Equip Electr Moteur METHOD AND DEVICE FOR SHUTTING DOWN A STARTER OF A MOTOR VEHICLE AFTER STARTING ITS ENGINE
FR2754016B1 (en) * 1996-09-27 1998-12-18 Valeo Equip Electr Moteur METHOD AND DEVICE FOR CONTROLLING THE SHUTDOWN OF A MOTOR VEHICLE STARTER
FR2757219B1 (en) * 1996-12-12 1999-03-05 Valeo Equip Electr Moteur IMPROVEMENTS TO ORDERING THE CUT-OFF OF A MOTOR VEHICLE STARTER
FR2757220B1 (en) * 1996-12-13 1999-03-05 Valeo Equip Electr Moteur IMPROVEMENTS TO METHODS AND SYSTEMS FOR CONTROLLING THE AUTOMATIC STOPPING OF A MOTOR VEHICLE STARTER

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EP0993395A1 (en) 2000-04-19
US6305338B1 (en) 2001-10-23
JP4108920B2 (en) 2008-06-25
JP2001510257A (en) 2001-07-31

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