The fuel pump relay of the Beidou Star is located on the left side of the engine compartment. On the left side, there are the compressor relay, fuel pump relay, main relay, and radiator fan relay. The main functions of the fuel pump relay include amplification, where a very small current can control a high-power circuit, and expanding the control range. When the signal reaches a certain value, it can switch, disconnect, or connect multiple circuits simultaneously according to the different forms of contact groups, achieving the purpose of automatic switching. Additional information: 1. Working principle: When a certain voltage or current is applied to both ends of the electromagnetic relay coil, the magnetic flux generated by the coil passes through the magnetic circuit composed of the iron core, yoke, armature, and working air gap of the magnetic circuit. Under the action of the magnetic field, the armature is attracted to the pole face of the iron core, thereby pushing the normally closed contacts to open and the normally open contacts to close. When the voltage or current at both ends of the coil is less than a certain value, and the mechanical reaction force is greater than the electromagnetic attraction force, the armature returns to its initial state, the normally open contacts open, and the normally closed contacts close. 2. Simplification: The automotive relay can be regarded as a collection composed of two parts: the control circuit where the coil operates and the main circuit where the contacts operate. In the control circuit of the relay, there is only a small operating current, because the contact capacity of the operating switch is small and cannot be used to directly control loads with high power consumption, but can only control their on-off through the contacts of the relay.
