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Thread: Computer to control Air Bag solenoids?

  1. #21
    Constant Bitrate stealinfool's Avatar
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    As far as overpressuring the bags, wouldn't a pressure safety system be pretty easy to implement? Say, if bags hit x PSI a sort of blowoff valve could keep them in check.

  2. #22
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    unless you are running more pressure in your tank than your bags can handle they wouldnt explode or anything, they might air up more than u would like, but a manual override would always be nice to have

  3. #23
    Low Bitrate Knightofoldcode's Avatar
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    Quote Originally Posted by stealinfool View Post
    As far as overpressuring the bags, wouldn't a pressure safety system be pretty easy to implement? Say, if bags hit x PSI a sort of blowoff valve could keep them in check.
    The only "pressure relief safety valves" that I know of have a preset pressure rating, usually in the range of 200 PSI. You pump 200 PSI into your airbags and you are going to have problems. I'm not certain what the airbag's max PSI is, but I don't THINK it's that high.

    Of course, I saw one dumbass who used a airbag rated for 125 PSI, and had it at over 300 PSI... same with the compressor and air hose's, all rated for 125-150 working PSI. I quickly walked away from that car.

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  4. #24
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    I'm going to be putting a similar setup to this in my truck in the next month or so. I think I have things pretty figured out, so here's what I'm planning on. I'm assuming you have the knowledge to build a carputer and get it working, if not...there's plenty of information on this forum to get you on your way.

    First thing you'll need is a reliable air ride setup. There's no "blow off" valves or anything crazy, just your fill and dump valves...don't make it more complicated than it needs to be... and yes depending on what parts you get, they can easily handle 200psi...not all of them, but some. It you need help in this area there are other forums you should check out. You're not going to blow anything up or anything crazy if you get a BSOD as long as you have a properly setup air ride system.

    Secondly I wouldn't have this setup without another means of controlling the suspension, just get a normal 10 switch box...I use the Playstation type controller. I assume you have all of this in good working order. If not then you should really focus you attention here and get a good working system before you attempt anything else.

    What I plan on using is a Phidgets relay controller in addition to my PlayStation controller. I'm also using my extra outputs on my remote starter for pancake up and down. It's funning sitting somewhere and dropping your car to the ground when someone looks at it or walks by.

    I plan on using the Phidgets relays to control normal Bosch style automotive relays, you probably don't have to do this, but it'll make connecting my key fob outputs easier (I'll use the same relays). Since you need an external power supply (fused 12v line from somewhere in your car) for the relays, just put this on a switch and then you can turn this whole contraption off when you're driving or when people decide to start poking the screen for fun. A good rule of thumb that I use is to always have it turned off and only turn it on when you need it(hence no BSOD problems since it'll be turned off most of the time), just put the switch somewhere convienent and it shouldn't really be a hassle. This would probably be safer for startup and shutdown also. Anyway at this point you're controlling a relay that you can use to "inject" 12v into the line going to you're valve. Just splice it into the wire that you have going to your valve. You could use diodes to isolate the relays from from your other switch box if you wanted, but I don't think it'll be problem without them.

    I don't really have the programming part figured totally out yet, I'll cross that bridge when I get there, but I don't expect it to be a huge problem. I'm sure there are some posts dealing with the programming side of things.

    I don't know if this really helped much, but it really isn't a very complicated setup, as long as your individual parts are working well i.e. Air Ride setup, carputer. Good Luck

  5. #25
    Low Bitrate iselfdevi's Avatar
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    I have an air ride suspension system in my TL . its the Air Ride technologies digital controller and easy street air over struts. I could take pics of the actual controller taken apart. I already did that because im modding a ps2 game controller to it so i can manipulate more then one bag at a time to perfoem side to side, sea-saw and pancake positions.

    As far as software controlling, its a matter of closing a circuit just to operate a button. all the buttons have a common pin, and the other pin is for either up or down for a certain corner. All the buttons are normally open. When pressed, it closes the circuit thus, activating the solenoid.

    Hope this info helps someone.

  6. #26
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    as far as ovepressuring the airbags even if for sum reason the computer did get stuck and left the valve open too long it would not make a difference.. air bag systems are usually regulated before that point anyways. the maximum pressure even going to the valve is the maximum pressure the bag ever gets.

    for example:
    the air tank fills up to maybe 150 psi or whatever pressure your running.. so holding the valve open would jsut fill the bag up to that pressure. holding it open for 1 sec or 1 minute will result in pretty much the same pressure in the airbag unless the compressor turns on and fills up both the airbag and tank at the same time.. either way the compressor would only fill up to whatever the pressure switch is set at in the first place. the only exception would be if you had nitrogen hooked up to your system.. in which case the pressure is alwys regulated down to normal psi right out of the tank anyways.

    the main problem i could see happening is if for sum reason the DUMP VALVES got stuck open.. causing your car to slam to the ground. and when you tried to lift your car up it woudl slam back down.

    if you are concerend about this i would defintealy still leave your normal switchbox hooked up.. and have a switch that cuts off the power that your computer sends to the valves.. once it cuts off power the all the valves will be closed again and you can use your normal switchbox in case of emergency.

  7. #27
    Low Bitrate Knightofoldcode's Avatar
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    Quote Originally Posted by rob1218 View Post
    as far as ovepressuring the airbags even if for sum reason the computer did get stuck and left the valve open too long it would not make a difference.. air bag systems are usually regulated before that point anyways. the maximum pressure even going to the valve is the maximum pressure the bag ever gets.

    for example:
    the air tank fills up to maybe 150 psi or whatever pressure your running.. so holding the valve open would jsut fill the bag up to that pressure. holding it open for 1 sec or 1 minute will result in pretty much the same pressure in the airbag unless the compressor turns on and fills up both the airbag and tank at the same time.. either way the compressor would only fill up to whatever the pressure switch is set at in the first place. the only exception would be if you had nitrogen hooked up to your system.. in which case the pressure is alwys regulated down to normal psi right out of the tank anyways.

    the main problem i could see happening is if for sum reason the DUMP VALVES got stuck open.. causing your car to slam to the ground. and when you tried to lift your car up it woudl slam back down.

    if you are concerend about this i would defintealy still leave your normal switchbox hooked up.. and have a switch that cuts off the power that your computer sends to the valves.. once it cuts off power the all the valves will be closed again and you can use your normal switchbox in case of emergency.

    You are totally correct. I hadn't thought of the fact that the highest pressure going into the airbags SHOULD be the highest pressure that the airbags can handle.

    I don't have airbags, and never will, just not my thing, but on my workshop air system, my compressor (big 50 gallon 220 volt compressor) is rated for 145 psi, and never goes above, I just make sure that all my tools are rated for above 145, and I never use a pressure regulator. I was forgetting about pressure regulator's, and when used properly they will completly remove this hazard that I mentioned of the computer being stuck on.

    I do have a little, 5 gallon, ~100 psi airbag compressor in my trunk, but it's used for small air tools, and inflating tires. So I have experience with compressed air in vehicles.

    I've got some really neat things in the works, and when I get them at least semi better for market, I'll post my products. But I do intend on creating a system for compressed air in vehicles, for either airbags, or small tools. (Impact wrench, tire inflator's, etc.)

    I've got a digital pressure read out built into my dash clock, of the pressure in the air tank, also the ability to turn on the compressor from the dash, digitally. For example, my little brother calls me up, and is sitting at the parking lot with a low tire, I can start the compressor filling before I get there to save on time. But this would be of course, useful for airbags. You CAN'T quote me on this, but I hope to have a fully functional system for less then $150.

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  8. #28
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    Quote Originally Posted by DarquePervert View Post
    I was at my future in-laws in Birmingham this weekend. He's a hot-rodder and hooks me up with his old Rod & Custom magazines. I was reading one and found an ad that piqued my interest.

    Check this out!

    Very nice! I've seen that before. But, if you already have your carpc in the vehicle...why get that? When you can add this to your carpc system for a fraction less.

  9. #29
    Newbie andromedaIVC's Avatar
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    Air Ride Control Solution

    I have a solution for virtually controlling your air ride suspension which features these functions:

    - Provide logic to move airbags individually or in any combination.

    - Airbag movement logic shall utilize feedback from ultrasonic or
    pressure sensors to move to the correct height and or pressure settings of the air bag (this is dependent on how efficiently you want to control your suspension). Intermediate positions between min and max should be achievable to a resolution of at least 1/10th the total range of travel, based on the distance from the chassis to the ground surface or pressure in the bag.

    - Display the pressure(s) or height(s) in real-time in each airbag and pressure holding tank(s).

    - Provide pre-set functions that will automatically adjust the height of the vehicle to low, high, or ride.
    - Enable users to create their own batch of commands that will automatically control the vehicle's height based on sequencing (show purposes only).

    This is a snippet of what the control application is capable of doing. It has also been incorporated as Digital Mod for StreetDeck as well.

    S.T.I.C. Developer
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  10. #30
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    is this application available yet? if so how much does it cost? if not.. when do youu expect it to come out?

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