Gearfshift Gearfshift Sensors for Trucks for Trucks for Trucks - Digi-Key

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