WO2021043646A1 - Dispositif de surveillance, véhicule à moteur et procédé de surveillance de la liaison de mise à la terre du châssis d'un bloc moteur à la carrosserie d'un véhicule à moteur - Google Patents

Dispositif de surveillance, véhicule à moteur et procédé de surveillance de la liaison de mise à la terre du châssis d'un bloc moteur à la carrosserie d'un véhicule à moteur Download PDF

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Publication number
WO2021043646A1
WO2021043646A1 PCT/EP2020/073848 EP2020073848W WO2021043646A1 WO 2021043646 A1 WO2021043646 A1 WO 2021043646A1 EP 2020073848 W EP2020073848 W EP 2020073848W WO 2021043646 A1 WO2021043646 A1 WO 2021043646A1
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WO
WIPO (PCT)
Prior art keywords
measuring
ground conductor
motor vehicle
monitoring device
ground
Prior art date
Application number
PCT/EP2020/073848
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German (de)
English (en)
Inventor
Per Ulrich
Henning Wöhl-Bruhn
Original Assignee
Volkswagen Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Volkswagen Aktiengesellschaft filed Critical Volkswagen Aktiengesellschaft
Publication of WO2021043646A1 publication Critical patent/WO2021043646A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks

Definitions

  • Monitoring device motor vehicle and method for monitoring a ground connection between an engine block and a body of a motor vehicle
  • the present invention relates to a monitoring device for monitoring a ground connection for electrically coupling an engine block of a motor vehicle to a body of the motor vehicle.
  • the invention also relates to a motor vehicle with a generic monitoring device and a method for monitoring a ground connection between an engine block and a body of a motor vehicle by means of a generic monitoring device.
  • On-board electrical systems with a nominal voltage of 12 V are used in motor vehicles. These electrical systems are also referred to as "low-voltage electrical systems".
  • the vehicle body is usually used as the ground connection between the battery and the various components, in particular consumers, of the vehicle electrical system. In addition, it is customary to establish the ground connection for components which are arranged in the area of the engine of the motor vehicle on the engine block. To ensure a secure galvanic connection to the rest of the vehicle electrical system, the engine block is galvanically coupled to the body by means of a ground strap or ground conductor.
  • a common ground connection of 12 V and 48 V components on the engine block has the advantage that the on-board power supply wiring can be designed more simply in this way. It is also advantageous for 48 V on-board network components that are also connected to the 12 V on-board network. Such components usually have an internal Potential separation between the two on-board networks, which is unnecessary if there is a common ground connection. In this way, the production effort and the production costs of these components can be significantly reduced.
  • a disadvantage of a common ground connection on the engine block is that possible faults must be determined, which can potentially occur in the event of a failure of the ground connection between the engine block and the body.
  • the ground connection between the engine block and the body fails, for example, due to a contact on the ground conductor becoming detached, the potential of the engine block would possibly be raised to well above 12 V by the connected 48 V components.
  • electrical energy could be fed back into the 12 V on-board network.
  • Such feedback of electrical energy carries the risk of an impermissible voltage increase in the 12 V on-board network and thus permanent damage to 12 V components of the 12 V on-board network. Damage to safety-relevant 12 V components is to be classified as particularly critical and therefore relevant to "ASIL". For this reason, a failure of the ground connection between the engine block and the body should be avoided from a safety-critical point of view.
  • a known solution for reducing the problem is a redundant design of the ground conductor for the ground connection of the engine block to the body. This can significantly reduce the risk of a total failure of the ground connection. At the same time, there is still the risk of an, in particular successive, failure of this ground connection. Devices and systems for analyzing the ground connection are already known to solve this problem.
  • DE 102012215542 A1 relates to a diagnostic device for a multi-voltage electrical system for monitoring a ground conductor of a ground connection between the engine block and the body with two ground conductors.
  • the diagnostic device is designed to measure the current flow in one of the ground conductors during operation of the motor vehicle with the aid of a measuring device. In this way, a state of the ground conductors during operation of the motor vehicle can be determined.
  • DE 102013 021 486 A1 discloses a method for monitoring an on-board network of a motor vehicle when the motor vehicle is in operation. Currents of second ground conductors are measured by means of two magnet coils connected in series and operated with alternating current, with a magnet coil being assigned to each ground conductor.
  • An alternative overvoltage protection circuit is known from DE 102013214 835 A1 which two vehicle electrical systems have a common ground connection and a reference ground connection.
  • the overvoltage protection circuit is designed to reduce the voltage of the vehicle electrical system with the higher voltage when a measured differential voltage between the ground connection and the reference ground connection reaches a threshold value.
  • ground connection can only be monitored when the motor vehicle or the vehicle electrical system is in operation.
  • An assembly error or a spontaneous failure of the ground connection could lead to electrical energy being fed back from the engine block into the 12 V on-board network and thus to damage or complete destruction of the 12 V components of the 12 V on-board network.
  • a monitoring device for monitoring a ground connection for electrically coupling an engine block of a motor vehicle to a body of the motor vehicle in a motor vehicle and a method for monitoring a ground connection between an engine block and a body of a motor vehicle fix or at least partially fix it.
  • the object is achieved by a monitoring device for monitoring a ground connection for electrically coupling an engine block of a motor vehicle to a body of the motor vehicle.
  • the monitoring device has a ground connection with a first ground conductor and a second ground conductor.
  • the engine block of an engine of the motor vehicle can be electrically coupled to the body via the first ground conductor and additionally via the second ground conductor.
  • the monitoring device has a measuring core with a central measuring feedthrough and a first measuring coil winding made of a coil wire and a measuring device electrically coupled to the coil wire of the first measuring coil winding for measuring a current in the coil wire.
  • the first ground conductor and the second ground conductor are passed through the measurement feedthrough of the measurement core in opposite directions.
  • the measuring core of the monitoring device is preferably made of a magnetizable material or preferably has a magnetizable material.
  • the measuring core is preferably designed in the form of a disk.
  • the measuring core likewise preferably has a rectangular or round cross section.
  • the measuring core is preferably designed to be mirror-symmetrical, in particular around two planes of symmetry arranged at 90 ° to one another.
  • the central measurement feedthrough preferably has an inner contour with an inner contour shape which corresponds to an outer contour shape of an outer contour of the measuring core.
  • the central measurement leadthrough and the measurement core preferably have a common central central axis.
  • the first measuring coil winding consists of the measuring wire, which is wound around the measuring core with a large number of winding loops.
  • the measuring wire is preferably designed as an insulated or lacquered copper wire.
  • the first measuring coil winding is wound around the measuring core in such a way that the individual winding loops each encompass an area of the measuring core which is formed between the central measuring feedthrough and an outer surface of the measuring core.
  • the measuring device is preferably designed to measure a current strength.
  • the measuring device is preferably designed to measure a voltage.
  • the measuring device is further preferably designed to provide a measuring current and impress it into the measuring coil winding.
  • the measuring device is preferably with the two ends of the coil wire of the first measuring coil winding is electrically coupled in such a way that an electric current induced in the first coil winding can be determined by means of the measuring device.
  • the first measuring conductor and the second measuring conductor of the monitoring device run in opposite directions through the measuring core of the monitoring device.
  • the first ground conductor and the second ground conductor are dimensioned equally. Due to the same dimensioning of the two ground conductors, currents of the same size normally flow through the two ground conductors when the motor vehicle is in operation. Due to the opposing arrangement of the two ground conductors, the magnetic fields caused by the currents of equal magnitude cancel each other out, so that no current is induced in the first coil winding.
  • the ground conductors are preferably designed to conduct operating currents of at least 800 A, particularly preferably at least 1000 A.
  • the measuring device can be used to make reliable statements about the condition of the measuring conductors.
  • the fact that the ground conductors are routed in opposite directions through a common measuring core has the advantage that the currents of the ground conductors can be determined on the basis of magnetic compensation and not by generating differential currents. In this way, accuracy of diagnosis is improved.
  • the measuring device can be used to carry out diagnoses when the motor vehicle is parked, that is, when the on-board networks are switched off. Such a diagnosis is not possible according to the prior art, since the on-board network must always be operated for the measurements.
  • the measuring core consists of a ferromagnetic material or at least has a ferromagnetic material.
  • the measuring core can, for example, be iron, nickel, cobalt or as a ferromagnetic material have the like.
  • the measuring core has at least one interruption area, in particular designed as an air gap, for interrupting a magnetic flux.
  • the measuring core can also have several interruption areas, in particular designed as an air gap, which are preferably evenly distributed over the measuring core.
  • the measuring core can also have a ferromagnetic material with a distributed air gap, such as an iron powder core.
  • the interruption area is preferably designed in such a way that no ferromagnetic material is arranged in the interruption area.
  • the interruption region is preferably designed in the shape of a cuboid.
  • the measuring core is further preferably dimensioned in such a way that it has a saturation of the magnetic flux at a differential current between the first ground conductor and the second ground conductor of 500 A, in particular from 500 A. More preferably, the measuring core is designed to go into saturation from a differential current of between 300A and 400A.
  • Such a measuring core has the advantage that the measuring core goes into saturation during operation of the motor vehicle even with a relatively low differential current of the ground conductors and, as a result, the coupling factor of the transformer of ground conductors, measuring core and first measuring coil winding drops. This drop in the coupling factor can be detected by means of the measuring device, so that a change or an increase in the total resistance of the ground conductors can be deduced from this.
  • This measuring principle works with both variable and stationary currents through the first ground conductor and the second ground conductor.
  • the measuring device is designed to apply a measuring current with a measuring frequency to the first measuring coil winding.
  • the Measurement frequency is preferably defined within a range between a lower frequency limit and an upper frequency limit.
  • the lower frequency limit is preferably set such that below the lower frequency limit there is no sinusoidal inductive transmission between the first measuring coil winding and the first ground conductor and the second ground conductor.
  • the upper frequency limit is preferably set such that above the upper frequency limit an inductance of the resistances of a short-circuit loop from the first ground conductor, the second ground conductor, the engine block and the body exceeds a line inductance of the first ground conductor and the second ground conductor.
  • the first ground conductor, the engine block, the second ground conductor and the body form a common short-circuit loop.
  • a magnetic field can be generated in the measuring core, which in turn causes an alternating current in the short-circuit loop.
  • the state of the ground connection can be determined by means of the measuring device. This has the advantage that the state of the ground connection can be determined with simple means and in a cost-effective manner even when the motor vehicle is parked, in particular when the on-board networks are switched off. Faulty wiring of the ground connection, for example as a result of an assembly error, can thus be detected early, before the vehicle electrical system is started up, so that damage to the 12 V components of the 12 V electrical system can be reliably avoided.
  • the first measuring coil winding is preferably arranged on a first side of the measuring core, the measuring core having a second measuring coil winding made of a coil wire on a second side, the coil wire of the second measuring coil winding being electrically coupled to the measuring device.
  • the electrical coupling of the first measuring coil winding to the measuring device is preferably carried out separately from the electrical coupling of the second measuring coil winding to the measuring device, so that the currents of the two measuring coil windings can be detected separately from one another.
  • the first measuring coil winding and the second measuring coil winding are preferably arranged on two opposite sides of the measuring core.
  • the second measuring coil winding can be designed to run in the same direction as or in the opposite direction to the first measuring coil winding.
  • the second measuring coil winding preferably has a similar number of turns to the first measuring coil winding.
  • a second measuring coil winding has the advantage that a better separation of the detection of the saturation of the measuring core can be achieved with simple means and in a cost-effective manner, since an induction of an electric current in the second measuring coil winding is reduced when the measuring core is saturated.
  • the measuring device is designed to output a warning signal when the measuring device detects a predefined line loss of the first ground conductor and / or the second ground conductor.
  • a line loss is understood to mean, in particular, an increase in the resistance of the ground connection.
  • the cause of this can be, for example, damage to the ground conductor and / or detachment of the ground conductor from the engine block and / or the body.
  • the warning signal can be output, for example, as an optical warning signal, in particular by means of a control lamp, and / or as an acoustic warning signal, in particular by means of a loudspeaker of the motor vehicle or a piezoelectric element.
  • the monitoring device is also preferably designed to shut down the 48 V on-board network when an inadequate ground connection is imminent or already present, in order to protect the 12 V components of the motor vehicle.
  • the monitoring device is preferably further designed to carry out this in connection with a controlled emergency braking of the motor vehicle.
  • the output of a warning signal has the advantage that the driver of the motor vehicle can be informed in good time about a state of the ground connection using simple means and in a cost-effective manner, so that he can drive the motor vehicle to a workshop to repair the defective ground connection before it closes damage to the 12 V components of the 12 V vehicle electrical system can result.
  • the object is achieved by a motor vehicle.
  • the motor vehicle has an internal combustion engine with an engine block, a body, a first vehicle electrical system with a first vehicle electrical system voltage and a second vehicle electrical system with a second vehicle electrical system voltage, the first vehicle electrical system voltage being greater than the second vehicle electrical system voltage.
  • the first vehicle electrical system and the second vehicle electrical system have a ground connection to the engine block.
  • the motor vehicle has a monitoring device according to the invention, the engine block being electrically coupled to the body in parallel via the first ground conductor and the second ground conductor of the monitoring device.
  • the first vehicle electrical system voltage is preferably 48 V
  • the second vehicle electrical system voltage is preferably 12 V.
  • the motor vehicle described results in all the advantages that have already been described for a monitoring device for monitoring a ground connection for electrically coupling an engine block of a motor vehicle to a body of the motor vehicle according to the first aspect of the invention. Accordingly, the motor vehicle according to the invention has the advantage over conventional motor vehicles that with simple Means as well as a diagnosis of the ground connection between the body and the engine block is ensured in a cost-effective manner.
  • the fact that the ground conductors are routed in opposite directions through a common measuring core has the advantage that the currents of the ground conductors can be determined on the basis of magnetic compensation and not through differential current generation. In this way, accuracy of diagnosis is improved.
  • the measuring device can be used to carry out diagnoses when the motor vehicle is parked, that is to say when the on-board networks are switched off. Such a diagnosis is not possible in motor vehicles according to the prior art, since the on-board network must always be operated for the measurements.
  • the first ground conductor and the second ground conductor preferably have a common connection point on the engine block and / or a common connection point on the body.
  • the first ground conductor and the second ground conductor can be fixed at the connection point by means of a common screw, for example.
  • the two ground conductors preferably have a common connection point on the engine block and separate connection points on the body.
  • a common connection point has the advantage that assembly of the ground connection is facilitated, since the number of assembly steps is reduced with simple means and in a cost-effective manner.
  • the object is achieved by a method for monitoring a ground connection of an engine block with a body of a motor vehicle by means of a monitoring device according to the invention.
  • the procedure consists of the following steps:
  • the measuring current at the measuring frequency is applied to the first measuring coil winding by means of the measuring device.
  • the measurement frequency is preferably defined within a range between a lower frequency limit and an upper frequency limit.
  • the lower frequency limit is preferably set such that below the Lower frequency limit there is no sinusoidal inductive transmission between the first measuring coil winding and the first ground conductor and the second ground conductor.
  • the upper frequency limit is preferably set such that above the upper frequency limit an inductance of the resistances of the short-circuit loop from the first ground conductor, the second ground conductor, the engine block and the body exceeds a line inductance of the first ground conductor and the second ground conductor. As a result, an alternating magnetic flux is generated in the measuring core.
  • This magnetic flux induces an alternating current in the first ground conductor and the second ground conductor.
  • This magnetic flux induces an alternating current in the first ground conductor and the second ground conductor.
  • the extent of this phase shift depends on the state of the ground connection and is measured by means of the measuring device.
  • the state of the ground connection is determined by means of the measuring device on the basis of the measured phase shift.
  • the method described results in all the advantages that have already been described for a monitoring device for monitoring a ground connection for electrically coupling an engine block of a motor vehicle to a body of the motor vehicle according to the first aspect of the invention and for a motor vehicle according to the second aspect of the invention. Accordingly, the method according to the invention has the advantage over conventional methods that a diagnosis of the ground connection between the body and the engine block is ensured with simple means and in a cost-effective manner. Due to the fact that the ground conductors are routed in opposite directions through a common measuring core, a differential current determination of the two ground conductors takes place, not a separate measurement of the two ground conductor currents, but rather on the basis of magnetic compensation in the measuring core.
  • the method can be carried out when the motor vehicle is parked, that is, with the on-board electrical system switched off, so that the risk of damage to the 12 V components of the 12 V on-board electrical system is reduced.
  • Such a diagnosis is not possible with methods according to the prior art, since the on-board network must always be operated for the measurements.
  • FIG. 1 A monitoring device according to the invention, a motor vehicle according to the invention and a method according to the invention are explained in more detail below with reference to drawings. They each show schematically: Figure 1 in a perspective view of a preferred first embodiment of a monitoring device according to the invention in a first state,
  • FIG. 2 shows a top view of a section of the monitoring device according to the invention from FIG. 1 in the first state
  • FIG. 3 in a perspective view, the monitoring device from FIG. 1 in a second state
  • FIG. 4 shows a section of the invention in a plan view
  • FIG. 5 shows the monitoring device from FIG. 1 in an equivalent circuit diagram
  • FIG. 6 shows a top view of a section of a preferred second embodiment of a monitoring device according to the invention in the second state
  • FIG. 7 shows a preferred embodiment of a motor vehicle according to the invention in a side view
  • FIG. 8 shows a preferred embodiment of a method according to the invention in a flow chart.
  • a preferred first embodiment of a monitoring device 1 is shown schematically in a first state in a perspective view.
  • the monitoring device 1 has a ground connection 2 by means of which an engine block 3 of a motor vehicle 4 (cf. FIG. 7) is electrically coupled to a body 5 of the motor vehicle 4.
  • the ground connection 2 has a first ground conductor 6 and a second ground conductor 7, each of which is electrically coupled to the engine block 3 via a separate connection point 18 and to the body 5 with a further connection point 18.
  • the monitoring device 1 has a cuboid measuring core 8 made of a ferromagnetic material, which has a central measuring leadthrough 9.
  • a first measuring coil winding 10 of the monitoring device 1 made of coil wire 11 is wound around one leg of the measuring core 8.
  • the coil wire 11 of the first measuring coil winding 10 is electrically coupled to a measuring device 12 of the monitoring device 1.
  • the first ground conductor 6 and the second ground conductor 7 are led through the measurement feedthrough 9 from opposite sides.
  • a current can flow, for example, from the engine block 3 via the ground connection 2 to the body 5.
  • the current will be divided equally between the two ground conductors 6, 7.
  • the magnetic fields thus generated cancel each other out when the ground conductors 6, 7 are intact, so that no current is induced in the first measuring coil winding 10. This can be determined by means of the measuring device 12.
  • the resistance of the ground connection 2 increases.
  • the current can be divided differently between the ground conductors 6, 7, so that the magnetic fields are no longer completely mutually exclusive cancel. This induces a current in the first measuring coil winding 10, which can be determined by means of the measuring device 12.
  • FIG. 2 shows a section of the monitoring device 1 according to the invention from FIG. 1 in the first state, schematically in a top view.
  • the measuring core 8 has an interruption region 13 on one leg, which is filled, for example, with a non-ferromagnetic material.
  • the first ground conductor 6 and the second ground conductor 7 run in opposite directions through the measurement feedthrough 9, so that in this view in the first state the currents flow through the ground conductors 6, 7 in opposite directions.
  • the first measuring coil winding 10 is not shown in this view.
  • the monitoring device 1 from FIG. 1 is shown schematically in a second state in a perspective view. Because the first ground conductor 6 and the second ground conductor 7 pass through the measurement feedthrough 9 in opposite directions, the first ground conductor 6, the body 5, the second ground conductor 7 and the engine block 3 form a short-circuit loop. In the second state, the coil wire 11 and thus the first coil winding 10 are acted upon by a measuring current with a measuring frequency. This induces an alternating current in the short-circuit loop. By determining a phase shift of the induced current in relation to the measuring current, the measuring device 12 can the Assess the state of the ground connection 2 even when the motor vehicle is parked, in particular when the on-board networks 16, 17 (cf. FIG. 7) are switched off.
  • FIG. 4 shows a section of the monitoring device 1 according to the invention from FIG. 3 in the second state, schematically in a top view.
  • the first ground conductor 6 and the second ground conductor 7 run in opposite directions through the measurement feedthrough 9, so that in this view, in the second state, the currents induced in the short-circuit loop flow through the ground conductors 6, 7 in the same direction.
  • the monitoring device 1 from FIG. 1 is shown schematically in an equivalent circuit diagram.
  • the monitoring device 1 is divided into a primary transformer side 19 and a secondary transformer side 20.
  • the primary transformer side 19 has a series connection of a ground connection resistor 21 of the entire ground connection 2 and a ground connection inductance 22 of the entire ground connection 2, which has a primary winding 23 with the number of turns "2" adjacent to the secondary side 20, since the short-circuit loop has exactly two turns.
  • the measuring device 12 is electrically coupled to a secondary winding 24, which corresponds to the first measuring coil winding 10.
  • the secondary winding 24 has a number of turns of “n” and is adjacent to the primary winding 23.
  • FIG. 6 shows a section of a preferred second embodiment of a monitoring device according to the invention in the second state, schematically in a top view.
  • a first measuring coil winding 10 made of measuring wire 11 is wound around one limb of the measuring core 8 and a second measuring coil winding 14 made of measuring wire 11 is wound around an opposite limb of the measuring core 8.
  • a preferred embodiment of a motor vehicle 4 according to the invention is shown schematically in a side view.
  • the motor vehicle has an internal combustion engine 15 with an engine block 3, a body 5 and a monitoring device 1.
  • the engine block 3 is electrically redundantly coupled to the body 5 by means of the monitoring device 1.
  • the motor vehicle has a first on-board network 16 with a first on-board network voltage, in particular of 48 V, and a second on-board network 17 with a second on-board network voltage, in particular of 12 V.
  • the first vehicle electrical system 16 and the second vehicle electrical system 17 are electrically coupled to the engine block 3.
  • a first method step 100 the first Measuring coil winding 10 is acted upon by a measuring current with a measuring frequency by means of the measuring device 12 of the monitoring device 12. This creates an alternating magnetic field which, in the short-circuit loop comprising the first ground conductor 6, body 5, second ground conductor 7 and engine block 3, generates an alternating current that is out of phase with the measurement current.
  • this phase shift is measured by means of the measuring device 12.
  • the state of the ground connection 2 is determined by means of the measuring device 12 on the basis of the measured phase shift. Any assembly errors and damage to the ground connection 2 can thus be reliably determined.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

La présente invention concerne un dispositif de surveillance (1) permettant de surveiller une liaison de mise à la terre d'un châssis (2) pour le couplage électrique d'un bloc moteur (3) d'un véhicule à moteur (4) à la carrosserie (5) du véhicule à moteur (4), comprenant une liaison de mise à la terre du châssis (2) avec un premier conducteur de terre (6) et un second conducteur de terre (7), le bloc moteur (3) pouvant être couplé électriquement à la carrosserie (5) par l'intermédiaire du premier conducteur de terre (6) ainsi que par l'intermédiaire du second conducteur de terre (7) ; un noyau de mesure (8) comprenant un trou d'interconnexion de mesure central (9) ainsi qu'un premier enroulement de bobine de mesure (10) constitué d'un fil de bobine (11) ; et un dispositif de mesure (12) couplé électriquement au fil de bobine (11) du premier enroulement de bobine de mesure (10) de manière à mesurer un courant dans le fil de bobine (11). Le premier conducteur de terre (6) et le second conducteur de terre (7) sont guidés au travers du trou d'interconnexion de mesure (9) du noyau de mesure (8) dans des directions opposées. La présente invention concerne en outre un véhicule à moteur (4) ainsi qu'un procédé de surveillance d'une liaison de mise à la terre de châssis (2) d'un bloc moteur (3) à une carrosserie (5) d'un véhicule à moteur (4) au moyen d'un dispositif de surveillance (1) de la présente invention.
PCT/EP2020/073848 2019-09-04 2020-08-26 Dispositif de surveillance, véhicule à moteur et procédé de surveillance de la liaison de mise à la terre du châssis d'un bloc moteur à la carrosserie d'un véhicule à moteur WO2021043646A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019213449.1A DE102019213449A1 (de) 2019-09-04 2019-09-04 Überwachungsvorrichtung, Kraftfahrzeug und Verfahren zur Überwachung einer Masseanbindung eines Motorblocks mit einer Karosserie eines Kraftfahrzeugs
DE102019213449.1 2019-09-04

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WO2021043646A1 true WO2021043646A1 (fr) 2021-03-11

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DE102013021486A1 (de) 2013-12-17 2014-08-21 Daimler Ag Verfahren und Vorrichtung zur Überwachung und/oder zum Schutz eines Bordnetzes in einem Fahrzeug
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