allow position memory. As the seat is moved a variable resistor, mechanically
linked to the motor, is also moved. The resistance value provides feedback to an
electronic control unit. This can be ‘remembered’ in a number of ways; the best
technique is to supply the resistor with a xed voltage such that the output relative
to the seat position is proportional to position. This voltage can then be ‘analogue-
to-digital’ converted, which produces a simple ‘number’ to store in a digital
memory. When the driver presses a memory recall switch, the motor relays are
activated by the ECU until the number in memory and the number ...
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