Gearfshift Sensors for Trucks REED RELAYS REED SENSORS REED SWITCHES Introduction More and more electronic control is being used in automobiles and trucks in “drive by wire” implementations. For improved functionality and ease of control, the transmission shifter arm movement in certain trucks is monitored using reliable reed sensors. The output signals from these sensors allow the vehicle computer to shift the transmission into park, reverse, neutral, drive, drive 2, and low. Figure 1. MK16-x-2 Sensor physical layout Features • Hermetically sealed • Rugged overmolded surface mount package • Dynamically tested contacts • Reliable switching without wearing parts • Ability to activate and control two sensors with one magnet • Ability to handle “under the hood” environment • Ability to operate -40°C to 130°C • No operating power required Figure 2. Cut-away of the gear shifter (left) and the sensor matrix top view (top right) and how magnet is centered directly over the sensor pairs . • Millions of switching operations Applications • Any truck gear shift requirement requiring computer control • Any application requiring accurate position placement sensing MEDER’s Surface Mount Reed Switch Sensors Lead The Way Truck gear shifts now use MEDER’s surface mounted Reed Sensor to sense the shifter position and send a signal to the micro computer initiating the gear change in the transmission. This approach eliminates the need for all the additional linkage from the transmission to the gear shift. Since the gear shift is one of the most used mechanical systems, its wear is inevitable with subsequent quality problems and ensuing costly repairs. MEDER’s electronic detection eliminates this entire issue. In addition, MEDER’s use of over-molded hermetically sealed reed switches makes it impervious to faulty operation when subjected to various environmental conditions. In addition, since there could be up to 12 Reed Sensors engaged when the vehicle is in use, there are only two that are activated and drawing a small amount of power at any one time. When the vehicle is off none of the sensors draw any power, insuring any inadvertent battery drain is avoided. In this application, MEDER’s MK16 accomplishes the sensing action when the two Reed Sensors are activated by a samarium cobalt magnet mounted in the gear shift handle. When the gear shift is moved to a new position the magnet will move into the influence of the next pair of Reed Sensors, which when activated will carry out their dual function. Consult our engineering group with your specific applications. MEDER electronic Application MEDER electronic AG | Germany | tel.: +49(0)7731/8399-0 | Email: [email protected] MEDER electronic Inc. | USA | tel.: +1 508.295.0771 | Email: [email protected] Page 1 of 2 www.meder.com Gearfshift Sensors for Trucks REED RELAYS REED SENSORS REED SWITCHES Consider some of the below surface mount options for the gearshift application. Specifications (@ 20° 20°C) MK16 6 Series MK1 Surface Mount Series Operate specs Min Max Units Must close distance distance 5 15 mm Must open distance 5 15 mm Hysteresis Load Characteristics Switching voltage Switching current Carry current Contact Contact rating Static Contact resistance Dynamic contact resistance Breakdown voltage Operate time Release time Operate Temp Storage Temp Typical 50% Series MK15 MK16 Min Max Units 200 0.5 0.5 10 150 200 230 0.6 0.1 -40 130 -50 130 V Amps Amps Watts mΩ MK17 MK22 mΩ V msec msec °C °C MK23MK23-35 MK23MK23-66 MK23MK23-87 Dimensions mm W 2.5 H 2.5 L 19.50 W 2.3 H 2.3 L 15.60 W 2.1 H 2.1 L 12.15 W 2.7 H 2.3 L 15.60 W 2.2 H 1.95 L 15.75 W 2.2 H 2.7 L 19.60 W 2.0 H 2.1 L 15.60 Illustration inches 0.098 0.098 0.768 0.091 0.091 0.614 0.083 0.083 0.478 1.060 0.091 0.614 0.087 0.077 0.620 0.087 1.060 0.772 0.079 0.083 0.614 **Consult the factory for more options not listed above. ** Figure 3. MK16 Tape & Reel MEDER electronic Application MEDER electronic AG | Germany | tel.: +49(0)7731/8399-0 | Email: [email protected] MEDER electronic Inc. | USA | tel.: +1 508.295.0771 | Email: [email protected] Page 2 of 2 www.meder.com