Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971
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Magnet sensors for Automobile Cruise Control

Reed switches in speedometers
Cruise Control

Cruise Control automatically controls the speed of a motor vehicle by adjusting the accelerator so that the driver need not keep it depressed on long drives. For the central microprocessor to maintain a set speed by adjusting the throttle when the road gradient changes, it needs to get feedback on the actual speed of the vehicle. Reed switch and magnets are mounted on the vehicles wheel assemblies and generate square wave pulse counting output that is used for the cruise control as well for the ABS. The on-board electronics averages out the wheel speeds and uses this signal to calculate the engine RPM and then adjust the throttle.
 

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