Refining Emergency Lock Systems in Automobiles

A manufacturer of automobile door lock systems needed to add an emergency lock release feature to their passive entry door lock system. TLX Technologies designed a three-position latching solenoid that would perform all the functions of an automobile door lock system, including an emergency release feature.

Customer Problem

A manufacturer of automobile door lock systems needed to add an emergency lock release feature to their passive entry door lock system. The new system needed to lock the doors, handle the passive entry function and unlock the doors, and provide an emergency escape lock release. The emergency lock release would allow passengers to unlock the doors when the key was turned on. This was vital in the event of a car accident where the electrical system had been damaged and passengers needed to exit the vehicle.

The TLX Solution

TLX Technologies designed a three-position latching solenoid that would satisfy all the manufacturer’s requirements for the door lock system. The component used one spring that expanded against a hard stop to center the armature and compressed when the armature moved in either direction, improving the center position tolerance, and eliminating the need to set up and adjust two springs. 

A shunt ring increased the pull-in force, allowing the solenoid to be smaller without sacrificing voltage and current requirements.

Three-Position Latching Solenoid

Specifications
Stroke
< 6.4 mm
Latching force (approx. for size shown)
44 N (10 lbs)
Response time
< 8 ms
Centering force
13 ± 4 N (3 ± 1 lb)
Current
12 A max.
Durability
> 100M cycles
Coil resistance at 20°C
5 Ω

All TLX components are customized to fit system requirements, meaning technical specifications are unique to each customer and design. Examples given on our website are for illustration purposes only.

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