Electrical distribution system

Abstract: An electrical distribution system for a motor vehicle comprising a power and signal distribution board (22) having electrical connection means (26) for connection to a power supply, to one or more electrical loads, and for signal distribution; signal distribution means (28) for receiving and transmitting electrical signals; at least one control board (30,31) extending between, and electrically connectable with, the power and signal distribution board and the signal distribution means, and having electrically operable switch means (32) mounted thereon for switching the power supply between the electrical connection means on the power and signal distribution board, and having electronic control means (34,36) mounted thereon for controlling the operation of the switch means dependent on signals received on the signal distribution means; and a casing (12) within which the power and signal distribution board, the signal distribution means, and the control board are mounted. Provides a modular arrangement for power and signal distribution.

Description: Technical Field The present invention relates to an electrical distribution system for a motor vehicle which is used for the distribution of both electrical power and electrical signals. Background of the Invention Currently, in motor vehicles, electrical power distribution and electrical signal distribution are in general isolated from one another, and/or are provided by numerous separate systems. This leads to complicated wiring harness designs, difficulties in installation in the motor vehicle, and a multitude of system casings and set-ups. WO 95/30263 A describes a power distribution module in accordance with the preamble of claim 1. Summary of the Invention It is an object of the present invention to simplify the electrical distribution within a motor vehicle. An electrical distribution system for a motor vehicle in accordance with the present invention is characterised over WO 95/30263 A by the features specified in the characterising portion of claim 1. The present invention provides a modular arrangement for power and signal distribution which reduces wiring harness complexity, provides easier installation in a motor vehicle, and enables a reduction in the number of variants. Brief Description of the Drawings The present invention will now be described, by way of example, with reference to the accompanying drawing, in which:- Figure 1 is a side view of an electrical distribution system in accordance with the present invention; and Figure 2 is an enlarged side view of part of the electrical distribution system of Figure 1. Description of the Preferred Embodiment Referring to the Figures, the electrical distribution system 10 for use in a motor vehicle comprises a casing 12 of electrically insulating material having an end wall 14; a side wall 16; a base wall 18; and an open end 20 opposite the base wall. The open portions of the casing 12 may be closed in any suitable manner, and other arrangements for the casing may be used. A power and signal distribution board 22 is mounted in the casing 12 adjacent the open end 20 thereof, and in a plane substantially parallel to the base wall 18. The board 22 is preferably in the form of a substantially rigid printed circuit board with electrically conductive lines 24 thereon for the distribution of electrical power and electrical signals. Electrical connectors 26 are mounted on the board 22 at each end, or at any other suitable location, and make electrical connection with the lines 24 for the input and output of both electrical power and electrical signals to and from the system 10. A ribbon cable 28 extends from the board 22 adjacent the end wall 14 and then across the base wall 18. The ribbon cable is electrically connected to the board 22 adjacent the end wall 14 of the casing 12. The ribbon cable 28 also provides for electrical signal distribution in the system 10. As an alternative, the ribbon cable may be replaced by a flexible printed circuit, a flexible flat circuit, or a moulded interconnection device. A number of control boards 30,31 extend between the board 22 and the ribbon cable 28. The control boards 30,31 are preferably slidably mounted in grooves (not shown) formed on the side wall 16 of the casing 12, and in a plane substantially perpendicular to the board 22. The control boards 30,31 are preferably substantially rigid printed circuit boards with electrically conductive lines (not shown) formed thereon. One or more of the control boards 30 has one or more relays 32 mounted thereon which are electrically connected with the electrically conductive lines formed on the control board. One or more of the control boards 31 has electronic components 34 mounted thereon, and may also include one or more microcomputers 36 mounted thereon which are electrically connected with the electrically conductive lines formed on the control board. At one end 37, each control board 30,31 extends through a corresponding aperture 38 in the board 22. Electrical connections are made between the lines 24 on the board 22 and the lines on the control boards 30,31 by way of electrical fuses or circuit breakers 40, or by a straight connection. At the other end 39, each control board 30,31 makes an electrical connection with the ribbon cable 28 by way of an electrical connector 42. The electrical connectors 42 are preferably either known card insert connectors or known insulation piercing connectors. With the present invention, power distribution and signal distribution for a motor vehicle can be combined within a casing which can be assembled before installation on a motor vehicle. Power distribution from a vehicle battery (not shown) to the electrical loads (not shown) in a vehicle is by way of the board 22, the fuses/circuit breakers 40 and the relays 32. The microcomputers 36 and electronic components 34 receive and send signals by way the board 22 and the ribbon cable 28 to monitor and control the operation of the relays 32, and to monitor and control the operation of other electrical components in the motor vehicle. The present invention therefore provides a modular arrangement for combining power and signal distribution. Such an arrangement reduces the complexity of vehicle wiring harnesses and provides for easier installation in a motor vehicle. The relays 32 may be replaced by any other suitable electrically controllable switching device, such as MOSFETs. The fuses/circuit breakers 40 may be replaced by any other suitable overload protection devices. The microcomputers 36 may be replaced by any other suitable form of logic control means or semiconductor control device. The electrical connectors 26 may be replaced by any other suitable form of electrical connection means. The present invention also lends itself for easy modification dependent on the vehicle within which the system is to be installed, and dependent on customer requirements for the vehicle, thereby reducing variants.

Claims: An electrical distribution system for a motor vehicle comprising a board (22) for power distribution; electrical connection means (26) for connection to a power supply, to one or more electrical loads, and for signal distribution; signal distribution means (28) for receiving and transmitting electrical signals; electrically operable switch means (32) for switching the power supply between the electrical connection means; electronic control means (34,36) for controlling the operation of the switch means dependent on signals received on the signal distribution means; and a casing (12) within which the board and the signal distribution means are mounted; characterised in that the board (22) is also for signal distribution; in that the electrical connection means (26) is mounted on the board; by at least one control board (30,31), mounted within the casing (12), extending between, and electrically connectable with, the power and signal distribution board (22) and the signal distribution means (28); in that the electrically operable switch means (32) is mounted on the at least one control board; and in that the control means (34,36) is mounted on the at least one control board. An electrical distribution system as claimed in Claim 1, comprising at least first and second control boards, the first control board (30) having the electrically operable switch means (32) mounted thereon, and the second control board (31) having the electronic control means (34,36) mounted thereon. An electrical distribution system as claimed in Claim 1 or Claim 2, wherein electrical fuses or circuit breakers (40) provide the electrical connection between the or each control board (30,31) and the power and signal distribution board (22). An electrical distribution system as claimed in Claim 2 or Claim 3, wherein the or each control board (30,31) extends through a corresponding aperture (38) in the power and signal distribution board (22) at one end (37) of the control board, the fuses or circuit breakers (40) being positioned at said one end. An electrical distribution system as claimed in any one of Claims 1 to 4, wherein the signal distribution means is a ribbon cable (28). An electrical distribution system as claimed in any one of Claims 1 to 5, wherein the power and signal distribution board (22) and/or the control boards (30,31) are substantially rigid printed circuit boards having electrically conductive lines (24) formed thereon.

Inventors: HOLD KLAUS, OEL LUDGER, STADLER PETER, STEIN THOMAS, HOLD, KLAUS, OEL, LUDGER, STADLER, PETER, STEIN, THOMAS
Applicants: DELCO ELECTRONICS EUROP GMBH, DELPHI AUTOMOTIVE SYSTEMS GMBH, DELCO ELECTRONICS EUROPE GMBH, DELPHI AUTOMOTIVE SYSTEMS DEUTSCHLAND GMBH
Application year: 1998
Main classification: B60R16
IPC codes: B60R16, H05K1