What is car's undercarriage made of?

Discussion in 'The Projects Forum' started by Neyolight, Feb 6, 2012.

  1. Neyolight

    Thread Starter Member

    Dec 13, 2011
    Hi all

    I want to know what is a car's undercarriage made of ? What metal ( or even specific what alloy ) ?

    I know its something close to aluminium but not quite sure. It looks aluminium!

    Also does different car manufacturers ( e.g toyota, honda, hyundai etc) use a different metal for their car's undercarriage?

  2. DerStrom8

    Well-Known Member

    Feb 20, 2011
    In order to answer this we'd need to know why you ask.
  3. Neyolight

    Thread Starter Member

    Dec 13, 2011
    Well Im designing an inductive loop sensor.

    I know the mass of the metal doesn't affect the result of a loop, but the metal type and surface area does.
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    It varies from manufacturer to manufacturer but...
    general purpose low carbon steel or aluminum (5182/5575/6061/6063 alloys).

    Could even be magnesium/carbon fiber/titanium on exotics.
    Neyolight likes this.
  5. Experimentonomen


    Feb 16, 2011
    If your looking to detect a car passing over a sensor, check how the traffic control lights work and how their sensors are setup.

    I would however think a load cell would be the easiest way to detect a car, rather than using magnetism based sensors.
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    Many use an inductive loop sensor :)
  7. BSomer


    Dec 28, 2011
    Traffic light controls vary. They do use an inductive loop to detect a vehicle. However, due to cars using less and less metal they have gone to a method that use cameras or motion detectors of some sort. I haven't had much interaction with the camera type so can't say much about those. The loop type I have installled for traffic lights and even automatic gates for access control. They generally have a wire that creates a loop in the pavement and, as I understand it, when a large enough metal object passes over the loop it will change the frequency response in the loop. That triggers some circuit to do something.
  8. wayneh


    Sep 9, 2010
    The "no moving parts" solution - the inductive loop - wins. I thought for the longest time that there were load cells or switches involved, but the traffic lights around here at least are all inductive loop metal detectors.
  9. bountyhunter

    Well-Known Member

    Sep 7, 2009
    Load sensors have been phased out for traffic because they won't pick up a motorcycle. The new ones are all magnetic loops.
  10. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    They are also being phased out due to the cost of maintenance and installation. They have to dig up roads if there is a fault, which is much worse than just replacing a mast-mounted camera module.

    With the powerful microprocessors available now for a couple of bucks per IC a camera based solution is definitely better.