An inertial switch is a switch, firmly mounted upon a vehicle or other mobile device, that triggers in the event of shock or vibration. It is a part of electrical circuits that may either enable or disable some function.[1]
The switch shown to the right is intended to disable an electric fuel pump in automotive applications. This functionality is required in some vehicle racing applications, since an electric fuel pump may otherwise continue operating after a collision or rollover. If the fuel line is broken or the vehicle is inverted, fuel may be spilled, creating a fire hazard. A small loose weight (called a proof mass) is trapped within a spring-loaded cage. A shock in any direction will cause movement of the mass relative to the cage. If sufficiently shocked, the cage will spring open which actuates an associated switch. The switch is reset by pressing the cage closed through the flexible (red) top cover, retrapping the mass. These switches are also used to open a contactor (a large relay) to disable the high power circuit of a battery electric vehicle upon collision.
Actuationedit
A normally open switch is used to activate passenger safety equipment early in a collision, typically to pre-tension seat belts and/or to activate airbags to protect the occupant(s) from collision with the vehicle interior or the steering wheel.
Inertia switches are also used in ordnance applications for both safety (shell will not explode until it has been subjected to launch acceleration) and fuzing.
inertial, switch, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, november,. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Inertial switch news newspapers books scholar JSTOR November 2016 Learn how and when to remove this template message An inertial switch is a switch firmly mounted upon a vehicle or other mobile device that triggers in the event of shock or vibration It is a part of electrical circuits that may either enable or disable some function 1 Inertial switchA disconnect switchTypeSwitchElectronic symbolDisconnect editThe switch shown to the right is intended to disable an electric fuel pump in automotive applications This functionality is required in some vehicle racing applications since an electric fuel pump may otherwise continue operating after a collision or rollover If the fuel line is broken or the vehicle is inverted fuel may be spilled creating a fire hazard A small loose weight called a proof mass is trapped within a spring loaded cage A shock in any direction will cause movement of the mass relative to the cage If sufficiently shocked the cage will spring open which actuates an associated switch The switch is reset by pressing the cage closed through the flexible red top cover retrapping the mass These switches are also used to open a contactor a large relay to disable the high power circuit of a battery electric vehicle upon collision Actuation editA normally open switch is used to activate passenger safety equipment early in a collision typically to pre tension seat belts and or to activate airbags to protect the occupant s from collision with the vehicle interior or the steering wheel Inertia switches are also used in ordnance applications for both safety shell will not explode until it has been subjected to launch acceleration and fuzing References edit 49 CFR 49 section 571 IV 571 IV nbsp This article about an automotive part or component is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Inertial switch amp oldid 1190560011, wikipedia, wiki, book, books, library,
