Automotive sensors and actuators.pdf

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Automotive

Sensors/Actuators

Sensor ± Input

Actuator - output

Electro

magnetic sensors

By running electric

current through a

wire, you can create a

magnetic field.

HowStuffWorks How Electromagnets Work.swf

Applications

: (1) crankshaft position for ignition and

fuel injection control; and

(2) road wheel rotational speed relative to

vehicle frame for anti-lock braking (ABS)

and traction control (TCS).

Variable

reluctance type

((resistance to magnetism)

an iron rotor with

lobes

on it;

a permanent magnet;

a metallic path (the pole piece) for

carrying the magnetic flux;

a coil, wound around the metallic

path, in which a voltage is induced.