SE1550774A1

SE1550774A1 - A system for providing a ground source of a vehicle

Info

Publication number: SE1550774A1
Application number: SE1550774A
Authority: SE
Inventors: Larsson Anders; Kling Robert; Vager Lars; Brunnsåker Magnus
Original assignee: Scania Cv Ab
Priority date: 2015-06-10
Filing date: 2015-06-10
Publication date: 2016-12-11
Also published as: DE102016006463B4; DE102016006463A1; SE538931C2; BR102016010959A2

Abstract

17 ABSTRACT The invention relates to a system for providing a reliable ground source ofan electricalconfiguration of a vehicle (410). Said ground source comprises an elongated ground member(200) arranged to be connected to ground of the vehicle (l00; 110) by means of at least onefastening means (201; 202; 203), said ground source being arranged to provide at least oneaccess point (P1; P2; P3; P4; P5) along said elongated ground member (200), wherein said atleast one access point (P1; P2; P3; P4; P5) is adapted to be connected to a wire configuration(W1a-W1b;W1a-W1m;W2a; W2b; W3a;W3b;W4a;W4b;W5; W5:1-W5-n)for providingground to an electrical component (110a; 110b; 110a-110m; 120a; 120b; 150a-150n) of saidelectrical configuration of said vehicle (100; 110). Said elongated ground member (200) may be arranged along a dash board of a vehicle cab (110) and connected to a cab framework. The invention also relates to a vehicle (100) being equipped with the system for providing a reliable ground source of an electrical configuration of a vehicle cab (410). Figure 4 for publication

Description

A system for providing a ground source of a vehicle TECHNICAL FIELD The present inventíon relates to a system for providing a reliable ground source of anelectrical configuration of a vehicle. The present inventíon also relates to a vehicle beingarranged with said system for providing a reliable ground source for power consuming units of said vehicle.

BACKG ROUND Vehicles of today, such as trucks, are equipped with various electronic devices or electricaldevices also denoted power consuming devices, such as actuators, control units, etc. Moreexamples of such power consuming devices may be a motor fan or an electrical wind screenheater. These power consuming devices of the vehicle may be powered by an electricalmachine being connected to an engine of the vehicle. Said power consuming devices mayalternatively be powered by an energy storage means, such as a separate battery or anelectrical storage means of a hybrid configuration being arranged for propulsion of the vehicle.

Said power consuming devices are today connected to a number of different ground sourcesfor providing a reference voltage of said devices. Today there is provided a number ofground points within the vehicle. Typically there is provided a number of electricalconnectors at predetermined locations within a cab of the vehicle. Each of said electricalconnectors is provided with a fixed number of terminals, wherein each terminal in turn is connected to a specific power consuming device by means of a suitable wire.

The required need for providing more ground terminals for providing ground access points iscontinuously increasing. This is due to the ongoing development of vehicles whereby moreand more electronic equipment is installed for each new generation/model of vehicles. Since each of said electrical connectors only is provided with a limited number of ground terminals, e.g. 21 ground terminals, which terminals further are dedicated to a specificelectronic device, a relatively low flexibility and configurability is achieved. lt may in fact sometimes be the case that all terminals of the electrical connectors are occupied. lt should be noted that said electrical connectors often are in the form of a plastic housingcomprising said terminals and are thus quite bulky. Due to the fact that said electricalterminals are provided at predetermined locations distributed within the cab of the vehiclesubstantial wiring is required for connecting each of said terminal and a respective powerconsuming device. This solution is bulky, in particular in an area at a dash board of the cab.This solution is also rather costly, since relatively long wires are required to connect said terminals with said power consuming devices.

Over time the electrical connections between said terminals and said wires the connectionsmay become loose, due to wear, oscillating environment, etc. This may lead to impairedoperation performance and possibly malfunction or failure of some of said power consuming devices.

US624906O relates to an electrical system for motor vehicle control, including a control processor which controls operation of electrically operated components of the vehicle.

SUMMARY OF THE INVENTION With reference to what is depicted above there is thus a need for providing a cost effective system for providing a reliable ground source of an electrical configuration of a vehicle.

One object of the present invention is to propose a novel and advantageous system for providing a reliable ground source of an electrical configuration of a vehicle.

Another object of the invention is to propose a novel and advantageous system for providinga reliable ground source of an electrical configuration of a vehicle, which system is less bulkyand further reduces required wiring for connecting a ground source to said electrical configuration.

Yet another object of the invention is to propose a system for providing a robust groundsource of a vehicle, said ground source being easy to mount during a manufacturing process of the vehicle.

Yet another object of the invention is to propose a versatile, adaptable and configurable system for providing a robust ground source of a vehicle.

Yet another object of the invention is to propose an alternative system for providing a reliable ground source of an electrical configuration of a vehicle.

Yet another object of the invention is to propose a novel and advantageous vehicle having a system for providing a reliable ground source of an electrical configuration.

Yet another object of the invention is to propose a novel and advantageous vehicle allowingfor easy, and hereby relatively cost effective, installation of a system for providing a reliable ground source of an electrical configuration of a cab of the vehicle.

Some of these objects are achieved with a system according to claim 1. Other objects areachieved with a vehicle being equipped with the inventive system according to claim 8.

Advantageous embodiments are depicted in the dependent claims.

According to an aspect of the invention there is provided a system for providing a reliableground source of an electrical configuration of a vehicle. Said ground source comprising anelongated ground member arranged to be connected to ground of the vehicle by means ofat least one fastening means, said ground source being arranged to provide at least oneaccess point along said elongated ground member, wherein said at least one access point isadapted to be connected to a wire configuration for providing ground to an electrical component of said electrical configuration of said vehicle.

Hereby said system provides for high reliability, cost effective manufacturing and installationas well as presenting a space saving configuration. The total length of said wire configuration may be kept to a minimum, which in turn provide a space saving configuration and reduced costs regarding wire material. Said electrical component may be an electronic component.

Said electrical component may be referred to as a power consuming unit.

The inventive system may advantageously be installed in a truck or lorry because of thetypically great variety of vehicle configurations provided by manufacturers. The system is easy to implement in any kind of truck or lorry configuration.

Said elongated ground member may be arranged in a vehicle cab and connected to a cab framework.

Said elongated ground member may be arranged to be connected to ground of the vehicleby means of a fastening means, one at each end portion of said elongated ground member.Said elongated ground member is easy and quick to install in a vehicle cab during amanufacturing process of the vehicle, thus providing a cost effective system according to anaspect of the invention, paying regard to reduced requested labour at an assembly facility.

Said fastening means may be any suitable fastening means.

Said elongated ground member may according to an example embodiment be fixedlyfastened to e.g. a frame work of said cab for providing a reliable ground connection. Thismay be performed by a welding process. Said elongated ground member may be fixedly fastened to e.g. a frame work of said cab by means of any suitable adhesive.

Said elongated ground member may according to an example embodiment be detachablyconnected to e.g. a frame work of said cab for providing a reliable ground connection.According to an example said elongated ground member is detachably fastened to ground of the vehicle by means of any suitable coupling member.

Said elongated ground member may be arranged along a dash board of said vehicle cab andconnected to a cab framework. Hereby a less bulky and easy to install ground member isprovided. Hereby a number of electrical components of said electrical configuration of saidvehicle may be connected to said elongated ground member while reducing or minimizing a total required length of wires for providing ground to said electrical components.

Said wire configuration may be connected to said elongated ground member by means of anultra-sonic weld connection. By providing so called ultra-sonic splices a reliable electrical connection between said wire configuration and said ground member is advantageously achieved. Hereby a reliable connection may be achieved in a cost effective way. Hereby longterm proper and reliable function of said system is ensured. Provision of said ultra-sonic weld connection advantageously reduces hazard of improper function due to wear.

Each access point may comprise a portion of said elongated ground member where aninsulating layer of said ground member is removed. Removal of said insulating layer of saidground member is relatively easy to achieve. Hereby adequate portions of said elongatedground member may be selected as access points for said wire configuration. Thisadvantageously provides a flexible and versatíle system according to an embodiment.Removal of said insulating layer may be performed manually by an operator and suitabletools. Removal of said insulating layer may be performed by means ofany suitable industrial robot in an automated fashion.

According to an embodiment at least one multi pole connector element may be connectedto said elongated ground member at an access point. Hereby is advantageously achieved apossibility to install an electrical connector having a fixed number of terminals for providingground to further electrical components. Said electrical connector may be installed aftermanufacturing of said vehicle. Said multi pole connector element may be installed in saidcab of the vehicle when applicable. This advantageously provides a versatíle system according to an embodiment of the invention.

Said elongated ground member may provide a considerable cross section area, for examplein the range of 10-50 mmz, of good electrical conductivity material. Said elongated groundmember may be provided with an insulating layer, e.g. consisting of plastics or any othersuitable material. Said elongated member may consist of e.g. cupper or any suitable alloy.Said cross section area may be less than 10 mmz. Said cross section area may be greater than50 mmz. Hereby a suitable cross section area of said elongated ground member may beprovided. Hereby optimal dimensions of said elongated ground member regarding space, weight, cost and performance may be chosen.

According to an aspect of the invention there is provided a system for providing a reliableground source of an electrical configuration of a vehicle. Said ground source comprising aground member arranged to be connected to ground of the vehicle by means of at least one fastening means, said ground source being arranged to provide at least one access point along said elongated ground member, wherein said at least one access point is adapted tobe connected to a wire configuration for providing ground to an electrical component of saidelectrical components of said vehicle. Herein said ground member may comprise anelongated ground member, such as a cable. Herein said at least one access point may be aplurality of access points distributed along said elongated ground member. Herein said wireconfiguration may be arranged for providing ground to a plurality of electrical components of said electrical configuration of said vehicle According to an aspect of the invention there is provided a vehicle comprising the system forproviding a reliable ground source of an electrical configuration of a vehicle cab. The vehicle may be a truck or a bus.

Further objects, advantages and novel features of the present invention will becomeapparent to one skilled in the art from the following details, and also by putting theinvention into practice. Whereas the invention is described below, it should be noted that itis not confined to the specific details described. One skilled in the art having access to theteachings herein will recognise further applications, modifications and incorporations in other fields, which are within the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS For fuller understanding of the present invention and its further objects and advantages, thedetailed description set out below should be read in conjunction with the accompanyingdrawings, in which the same reference notatíons denote similar items in the various diagrams, and in which: Figure 1 schematically illustrates a vehicle according to an embodiment of the invention;Figure 2a schematically illustrates a system for providing a reliable ground source of anelectrical configuration of a vehicle, according to an aspect of the invention; Figure 2b schematically illustrates a system for providing a reliable ground source of anelectrical configuration of a vehicle, according to an aspect of the invention; Figure 2c schematically illustrates a system for providing a reliable ground source of an electrical configuration of a vehicle, according to an aspect of the invention; Figure 2d schematically illustrates a system for providing a reliable ground source of anelectrical configuration of a vehicle, according to an aspect of the invention; Figure 3 schematically illustrates an electrical access point, according to an embodiment ofthe invention; and Figure 4 schematically illustrates a cab of a vehicle being provided with a ground source for an electrical configuration, according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE DRAWINGS Figure l depicts a side view of a vehicle 100. The exemplified vehicle 100 comprises a tractorunit 110 and a trailer 112. The vehicle may be a heavy vehicle, e.g. a truck or a bus. lt may alternatively be a car. lt should be noted that the inventive system for providing a ground source of an electricalconfiguration is applicable to various vehicles, such as e.g. a mining machine, tractor,dumper, wheel loader, platform comprising an industrial robot, forest machine, earthmover, road construction vehicle, road planner, emergency vehicle or a tracked vehicle. The vehicle may according to an example be an autonomous vehicle.

Figure 2a schematically illustrates a part of a system for providing a reliable ground source 200 of an electrical configuration of a vehicle 100, according to an example embodiment.

Said system comprises an elongated ground member 200. Said elongated ground member200 is arranged to be connected to a first portion of a cab of said vehicle 100 at a first endportion El. A first fastening means 201 is arranged at said first end portion El of saidelongated ground member 200 and/or at said first portion of said cab of said vehicle 100.Said first fastening means 201 is arranged to electrically connect said elongated groundmember 200 to ground of said vehicle 100. Said elongated ground member 200 may bearranged to be fixedly secured at said first end portion El to said first portion of said cab ofsaid vehicle 100. Alternatively said elongated ground member 200 may be arranged to bedetachably connected at said first end portion El to said first portion of said cab of said vehicle 100.

Said elongated ground member 200 is arranged to be connected to a second portion of a cabof said vehicle 100 at a second end portion E2. A second fastening means 202 is arranged atsaid second end portion E2 of said elongated ground member 200 and/or at said secondportion of said cab of said vehicle 100. Said second fastening means 202 is arranged toelectrically connect said elongated ground member 200 to ground of said vehicle 100. Saidelongated ground member 200 may be arranged to be fixedly secured at said second endportion E2 to said second portion of said cab of said vehicle 100. Alternatively said elongatedground member 200 may be arranged to be detachably connected at said second end portion E2 to said second portion of said cab of said vehicle 100.

Said first fastening means 201 and said second fastening means 202 may be any suitablefastening means. According to one example said first fastening means 201 and said secondfastening means 202 may comprise a screw. According to one example said first fasteningmeans 201 and said second fastening means 202 may comprise an adhesive. According toyet an example said first end portion El and said second end portion E2 may be welded to said first portion of said cab and said second portion of said cab, respectively.

Said elongated ground member 200 is connected to the cab of the vehicle 100 so that it isgrounded. Hereby said elongated ground member 200 may be connected to a frame work of said cab of said vehicle 100.

According to this example embodiment said elongated ground member 200 is attached attwo end portions thereof so as to constitute a ground source. According to another exampleembodiment only one end portion, e.g. said first end portion El, is connected to a ground portion of said cab, e.g. said first portion of said cab.

Said elongated ground member 200 is provided with a number of access points. According tothis embodiment said elongated ground member 200 is provided with four access points,namely a first access point P1, second access point P2, third access point P3 and a fourthaccess point P4. According to this example said four access points Pl-P4 are substantially evenly distributed along said elongated ground member 200. Said elongated ground member 200 may have an arbitrary suitable number of access points. The access points maybe distributed in any suitable way. According to an example 10 or 25 access points may beprovided at said elongated ground member 200. The number of access points and adistribution of said access points along said elongated ground member is a choice of design,paying regard to the power consuming units which are to be connected to said elongated ground member 200.

Each of said access point has a number of electrical wires connected between said elongatedground member 200 and a number of power consuming units for providing ground to saidpower consuming units. According to this example said first access point P1 has twoelectrical wires, namely a first electrical wire Wla and a second electrical wire Wlb. Hereinsaid second access point P2 is provided with two electrical wires, namely a first electricalwire W2a and a second electrical wire W2b. Said third access point P3 is provided with twoelectrical wires, namely a first electrical wire W3a and a second electrical wire W3b. Saidfourth access point P4 is provided with two electrical wires, namely a first electrical wireW4a and a second electrical wire W4b. lt should be noted that each of said access points P1-P4 may be provided with a suitable number of electrical wires each being electricallyconnected to a respective power consuming unit. According to one example each of saidaccess points P1-P4 may be provided with more than 10 separate electrical wires. Accordingto one example each of said access points P1-P4 may be provided with more than 50separate electrical wires. Each of said access points may be distributed in a way such thatthe total required length of said electrical wires connecting provided power consuming unitswith said elongated ground member is minimized. Herein said wire configuration refers tosaid provided electrical wires connecting said elongated ground member and said powerconsuming units. Said electrical wires of said wire configuration may consist of any suitable electrical wires, such as for example insulated copper wires.

For sake of clarity, only four power consuming units are present in Figure 2a. lt is illustratedthat said first access point P1 is provided with said first electrical wire Wla and said secondelectrical wire Wlb. Said first electrical wire Wla is connected to a first power consumingunit 1l0a. Said second electrical wire Wlb is connected to a second power consuming unit 110b. lt is further illustrated that said second access point P2 is provided with said first electrical wire W2a and said second electrical wire W2b. Said first electrical wire W2a isconnected to a first power consuming unit 120a. Said second electrical wire W2b isconnected to a second power consuming unit 120b. Hereby said power consuming unitsl10a, 110b, 120a and 120b are connected to said elongated ground member 200 via saidelectrical wires Wla, Wlb, W2a and W2b, respectively. Said power consuming units may be denoted power consuming devices. lt should be understood that said electrical wires of said third access point P3 and said fourthaccess point P4 also are connected to a respective dedicated power consuming unit, even though it not illustrated in Figure 2a.

According to an example at least one electrical wire of any access point may not connectedto a power consuming unit, but may function as back-up in case yet another power consuming unit is to be installed in said vehicle 100.

Said power consuming units may be any suitable power consuming units. Said powerconsuming units may for example be anyone chosen from a group comprising: electroniccontrol unit, electrical instrument, electrical machine, I/O-unit, actuator means, auxiliarydevice, etc. Said power consuming units may be any power consuming units requiringprovision of electrical ground. Said electrical configuration may comprise said power consuming units.

Herein said power consuming units are powered by at least one power source, such as abattery package or an electrical machine. For sake of simplicity power sources for electricallypowering said power consuming units are not illustrated or depicted in greater detail herein.The description of various embodiments of the present invention is focused on provision ofground (GND) to said power consuming units. According to one example ”ground” herein is intended to be a reference voltage, such as for example 0 Volts.

Figure 2b schematically illustrates a system for providing a reliable ground source of an electrical configuration of a vehicle, according to an aspect of the invention; 11 Hereby is presented an alternative configuration of said elongated member 200. Hereby twoaccess points Pl and P2 are provided Said access points Pl and P2, having said wires Wla,Wlb, W2a and W2b, as well as the end portions El and E2 are depicted with reference to Figure 2a.

According to this example a fifth access point P5 is provided. A fifth electrical wire W5 isarranged between said elongated ground member and an electrical connector device 250.Said electrical connector device 250 is provided with n terminals, where n is a positiveinteger, such as 10, 20 or 30. Each of said n terminals may be connected to a powerconsuming unit. Herein is presented that a first terminal 250:1 is connected to a powerconsuming unit 150a by means of an electrical wire W5:l. The terminal number n is herebyconnected to a power consuming unit 250:n by means of an electrical wire W5:n. lt shouldbe noted that a number of terminals, possibly all of said terminals, may be connected to adedicated power consuming unit via a respective electrical wire. Hereby ground may beprovided to a number of power consuming members by means of said connector device 250 and suitable electrical wires from said fifth access point.

Said electrical connector device 250 may be referred to as a multi pole connector element.

Herein said electrical connector device 250 is arranged to provide ground on each terminal.

According to one example more than one connector device may be provided in a similar way as depicted above.

Figure 2c schematically illustrates a system for providing a reliable ground source of anelectrical configuration of a vehicle 100, according to an aspect of the invention.

Said system comprises said elongated ground member 200. Said elongated ground member200 is arranged to be connected to a first portion of a cab of said vehicle 100 at said first endportion El by means of said first fastening means 201. Said elongated ground member 200 isarranged to be connected to a second portion of a cab of said vehicle 100 at said second endportion E2 by means of said second fastening means 202.

According to this example there is provided a third end portion E3 of said elongated ground member. Said elongated ground member 200 is hereby arranged to be connected to a third 12 portion of a cab of said vehicle 100 at said third end portion E3 by means of a third suitablefastening means 203. Said third fastening means 203 is arranged to electrically connect saidelongated ground member 200 to ground of said vehicle 100 so as to further increasestability and reliability of said elongated ground member 200. Said elongated groundmember 200 may be arranged to be fixedly secured at said third end portion E3 to said thirdportion of said cab of said vehicle 100. Alternatively said elongated ground member 200 maybe arranged to be detachably connected at said third end portion E3 to said third portion ofsaid cab of said vehicle 100. Herein said elongated ground member 200 is generally Y- shaped.

Figure 2d schematically illustrates a system for providing a reliable ground source of an electrical configuration of a vehicle, according to an aspect of the invention.

Hereby is presented an embodiment of the system presented with reference to Figure 2c.Hereby said elongated ground member 200 is provided with three access points betweensaid first end portion El and said second end portion E2, namely said first access point P1,said second access point P2 and said third access point P3. Further, said fourth access pointP4 is provided in proximity of said third end portion E2. Herein said elongated ground member 200 is generally Y-shaped.

Figure 3 schematically illustrates said first electrical access point P1, according to an embodiment of the invention.

Hereby, a number of electrical wires are provided between a respective power consumingunit and said elongated ground member 200. Any suitable number of electrical wires may beconnected to said elongated ground member 200 at each access point thereof. According tothis example m electrical wires are connected to said elongated ground member 200, wherem is a positive integer, such as for example 10, 20 or 30. Herein said first electrical wire Wlais connected to said first power consuming unit 110a, etc. Hereby said power consuming units are connected to ground for proper performance and operation. 13 Various techniques for connecting said electrical wires Wla-Wlm to said elongated groundmember may be applied. According to this example said electrical wires Wla-Wlm arecrimped by means of a crimping element 300 at said elongated ground member 200. Thismay be performed manually by means of suitable tools. Alternatively said crimping processmay be performed by means of any suitable industrial robot at an assembly facility. Anysuitable number of electrical wires may be connected to an access point of said elongatedmember 200. lt should also be noted that said connected electrical wires may presentmutually independent lengths. The respective lengths of electrical wire may thus bemutually different. A length of each of said electrical wire is chosen on the basis of a relative position of a respective power consuming unit.

One advantageous technique for connecting said electrical wires to said elongated groundmember 200 is so called ultrasonic welding. Hereby reliable connections of said electricalwires to said elongated ground member are achieved. Ultrasonic welding is a techniquewhereby high-frequency ultrasonic acoustic vibrations are locally applied to elements beingheld together under pressure. Hereby a solid-state weld is created so as to fastening saidelectrical wires to said elongated ground member. According to this technique there are noconnective bolts, nails, soldering materials, or adhesives necessary to bind the materials together.

According to another technique for connecting said electrical wires to said elongated groundmember 200 any suitable adhesive may be used. Alternatively any suitable connectingelement may be used for connecting said electrical wires to said elongated ground member200. According to one example various connecting techniques may be used at different access points.

Figure 4 schematically illustrates a cab 410 of the vehicle 110 being provided with a groundsource of an electrical configuration, according to an embodiment of the invention.

Hereby is illustrated Hereby is illustrated that said elongated ground member 200 is arranged along a dash board of a cab 410 of the vehicle 110. Said elongated ground member 200 is hereby arranged 14 beneath said dash board. Said elongated ground member 200 is thus non visible from a drivers perspective in said cab.

Said elongated ground member 200 is connected to ground portions of said cab at said firstend portion El and said second end portion E2. Hereby said elongated ground member 200 is connected to ground of said vehicle 110.

For purposes of illustration a wind screen 420 and a steering wheel 430 of said cab is schematically illustrated.

Hereby said elongated ground member 200 is arranged to provide ground to a number of power consuming units of the vehicle 110 via an electrical wire configuration (not shown).

The foregoing description of the preferred em bodiments of the present invention isprovided for illustrative and descriptive purposes. lt is not intended to be exhaustive, nor tolimit the invention to the variants described. Many modifications and variations willobviously suggest themselves to one skilled in the art. The embodiments have been chosenand described in order to best explain the principles of the invention and their practicalapplications and thereby make it possible for one skilled in the art to understand theinvention for different embodiments and with the various modifications appropriate to the intended use.

Claims

1. A system for providing a reliable ground source of an electrical configuration of a vehicle (110),characterized in that said ground source comprises an elongated ground member (200) arranged to be connectedto ground of the vehicle (110) by means of at least one fastening means (201; 202; 203), saidground source being arranged to provide at least one access point (P1; P2; P3; P4; P5) alongsaid elongated ground member (200), wherein said at least one access point (P1; P2; P3; P4;P5) is adapted to be connected to a wire configuration (W1a-W1b;W1a-W1m; W2a; W2b;W3a; W3b; W4a; W4b; W5; W5:1-W5-n) for providing ground to an electrical component(110a; 110b; 110a-110m; 120a; 120b; 150a-150n) of said electrical configuration of saidvehicle (110).

2. The system according to claim 1, wherein said elongated ground member (200) isarranged to be connected to ground of the vehicle (110) by means of a fastening means (201; 202; 203), one at each end portion of said ground member (200).

3. The system according to claim 1 or 2, wherein said elongated ground member (200) is arranged along a dash board of a vehicle cab (110) and connected to a cab framework.

4. The system according to anyone of the claims 1-3, wherein said wire configuration isconnected to said elongated ground member (200) by means of an ultra-sonic weld connection. 16

5. The system according to anyone of the claims 1-4, wherein each access point (P1-P5)comprises a portion of said elongated ground member (200) where an insulating layer of said ground member (200) is removed.

6. The system according to anyone of the claims 1-5, wherein at least one multi poleconnector element (250) is connected to said elongated ground member at an access point (P1-P5).

7. The system according to anyone of the claims 1-6, wherein said elongated groundmember (200) provides a considerable cross section area, for example in the range of 10-50 mmz, of good electrical conductívity material.

8. A vehicle comprising the system according to anyone of the claims 1-7.

9. The vehicle according to claim 8, which vehicle is a truck or a bus.