Motor vehicle electrical architecture comprising a distribution box of at least one switched electrical supply, method for the use thereof, and motor vehicle incorporating same

An electrical architecture of a motor vehicle, comprising:

• an electrical ground and at least one DC voltage source delivering a supply voltage;
• at least one current-consuming device;
• an electrical distribution box with at least one supply rail coupled to an input of the box to receive the supply voltage and a ground rail coupled to a ground, at least one output terminal, and at least one relay arranged in series between the supply rail and the output terminal of the box and adapted to switch the supply voltage to the output terminal;
• a wiring harness, arranged between the output terminal of the electrical distribution box and the at least one current consuming device in order to supply said at least one current consuming device electrically with the switched supply voltage;
• and
• at least one computer,
• wherein, said electrical architecture further comprises a controllable resistive load electrically connected in parallel between the output of the electrical distribution box, on the one hand, and the positive supply rail or the ground, on the other hand, said controllable resistive load comprising at least one switch in series with at least one resistor, said switch being adapted to be controlled by the at least one computer according to a control law that is adapted to cause the at least one switch to close for a vehicle speed below a first determined speed threshold, making it possible to ensure current consumption in the at least one relay under the supply voltage that is greater than a determined current threshold, on the one hand, and to cause the at least one switch to open for a vehicle speed greater than a second determined speed threshold higher than said first speed threshold, on the other hand.