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

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.

Application Classification

Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.

Pulse Counting Type

Speedometer pulse counting Reed Switches have a very high operating frequency and this feature lends itself to...Continue reading ->

The Reed Switches and Sensors used in such applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.

R3 Miniature SMD Reed Sensor

Miniature Reed Sensor Omni polar, normally open (NO), 16.25 mm SMD and low-profile SMD pitch. 10 W...Continue reading ->

R2 Standard size SMD Reed Sensor

Standard Size Reed Sensor Omni polar, normally open (NO), 19.5 mm SMD and low-profile SMD pitch, 10 W...Continue reading ->

MS-225, M5 Threaded Cylindrical Sensor

M5 threaded cylindrical sensor Omni polar, 0.5 mm pitch M5 thread for accurate positioning and locking, switches loads...Continue reading ->