Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 34

Thread: Fuel shutoff

  1. #11
    Fusion Brain Creator
    Join Date
    Mar 2005
    Posts
    2,221
    Quote Originally Posted by walky_talky20
    I don't think coasting to stop is really the worst case. If you lose the fuel pump you also lose a lot of other stuff. Power Steering and Power Brakes to start with. And imagine the fuel pump cutting out while making a left turn into McDonalds (across traffic). The car stalls in the path of oncoming traffic. The point is, it could potentially be a lot more dangerous than "The car would coast to a stop".


    Actually, it would.

    Have you ever turned your key off at 65 MPH?

    Same effect as closing the throttle plate. If fact, on my Explorer, the fuel injectors are shut off when the throttle is closed and engine RPM > idle

  2. #12
    Maximum Bitrate
    Join Date
    May 2005
    Location
    Rochester, NH
    Posts
    616
    Well first off.. power brakes and power steering are minimal... I have drivin several cars in my life without steering, and brakes I have had completely fail on me before at an intersection and I still stopped... I have a light weight manual with a good ebrake. In order to get this to fail the computer would have to somehow throw a pulse with the application shut down and the card uninitialized to the proper output. Thats about as likely as your cd tray ejecting on its own... the computer would have to inadvertently send a pulse to the release latch.

  3. #13
    Maximum Bitrate
    Join Date
    May 2005
    Location
    Rochester, NH
    Posts
    616
    Quote Originally Posted by greenman100
    Actually, it would.

    Have you ever turned your key off at 65 MPH?

    Same effect as closing the throttle plate. If fact, on my Explorer, the fuel injectors are shut off when the throttle is closed and engine RPM > idle
    what about speed limiter... ever hit that... my z did that at 138... alittle violent, but if your not a crappy driver your passengers wouldn't even say anything more then... what was that?

    haha, except... what the heck are we doing 138 for!!!! then they soil themselves.

    I'm not just trying to argue or be an idiot... I'm just trying to gather some valid reasons why not to do this. To this point I'm not super convinced with well there is the remote chance that it could somehow shut the fuel off while your driving it... and thats unsafe... common guys... we all have touch screens in our dash... really, is that safe?!

    Oh, and I'm not sure exactly what your saying green... it could go either way... sounds like your saying it would be bad, but then your saying that your truck does it stock... I'm sure I'm just not reading it well.

  4. #14
    Maximum Bitrate kiltjim's Avatar
    Join Date
    Feb 2004
    Location
    PA, USA
    Posts
    805
    Quote Originally Posted by greenman100
    Have you ever turned your key off at 65 MPH?
    Actually, I think the result would differ from car to car. I had a '92 Pontiac Grand Am, and for whatever reason, the car would act really weird everyonce and a while. I would have to shift to nuetral, and restart the car. It was an electrical problem, but the car wouldn't stall, so I would have to shut off the car first, before restarting.

    I tried the same thing in a Kia, just to see what would happen, and it made a loud bad noise. I was young, and it wasn't my car, so I wasn't concerned about what the loud noise was (wasn't the starter if that's what you are thinking).

    But it is your car. All these projects are completely custom, so if it works in your car, go for it. I really think that you should use a dedicated controller though. I'm not worried about the effects on the car, just the repetitive problems you might have. Its fine if it happens once, and nothing happens. It is going to be a pain in the *** if it happens all the time because you run low on ram, and the computer crashes.
    2000 Subaru OBS

    Dell P3 @ 900 Mhz
    7" Lilliput TS w/DigitalWW in-dash mount
    80GB External HD

    I am Zero Bitrate....

  5. #15
    Maximum Bitrate
    Join Date
    May 2005
    Location
    Rochester, NH
    Posts
    616
    Well thats the thing... the application would be triggered by hibernation... when it reboots from hibernation the application comes up... if you don't put in the password then the application stays and ultimately shuts off the fuel... if you put in the password... the application exits completely. There is no ram issues... no crashing... it would have to initialize the card and send the code to it to send 12 volts to the relay in order to open it... remember that its a latching relay... so it would stay closed unless told to open... then it would stay open until told to close...

    If it happened once I would take it out... but I don't expect it to ever happen let alone repeatedly.

  6. #16
    Low Bitrate
    Join Date
    Oct 2005
    Location
    Oshawa
    Posts
    81
    I consider the fuel pump to be "mission critical" and personally, I would never put anything mission critical in the hands of microsoft!

    But to each his own.
    Hey Laserlips, your momma was a snowblower!!

  7. #17
    Maximum Bitrate kiltjim's Avatar
    Join Date
    Feb 2004
    Location
    PA, USA
    Posts
    805
    Again I'm not saying it is a bad idea. It does seem like a novel concept, that developed professionally, could lead to a really nice add-on.

    The hibernation thing concerns me though. Every program I have tried to use, eventually stalls or crashes coming out of hibernation. Though, the latching relay is definetely a way around many problems. If the program or card crashes, and doesn't "flicker" the card then you should be ok.

    I think its a neat idea, just when it comes to controlling my car, especially something "mission critical" I want a button, or something professionally developed, something with years of development behind it.
    2000 Subaru OBS

    Dell P3 @ 900 Mhz
    7" Lilliput TS w/DigitalWW in-dash mount
    80GB External HD

    I am Zero Bitrate....

  8. #18
    FLAC alti's Avatar
    Join Date
    Sep 2004
    Location
    NY
    Posts
    1,723
    I think having a simple hidden machinical switch is a much better idea. Then the car never leaves its parking spot, plain and simple. It does not end up stalled in the middle of a highway, and the theif does not smash in my screen in a attempt to stop the countdown.
    My Install

    Software:
    CFiG v1
    iGuidance Plugin for CF

    CarShell
    Working shell for a CarPC

    StopWatch
    StopWatch plugin remade for centrafuse RC1

  9. #19
    Maximum Bitrate
    Join Date
    May 2005
    Location
    Rochester, NH
    Posts
    616
    your missing the point I guess. If I wanted a mechanical safty system I would buy the club... I don't want to turn some switch on and off every time I get into my car... I don't even want to lock my doors thats why I have an alarm.

  10. #20
    Constant Bitrate
    Join Date
    Sep 2005
    Posts
    121
    I would not have an operating system behind ANY aspect of critical car control, steering, pumps, lights, breaks, heck, even windscreen wipers!!

    Microcontrollers are the way If they work the first time, they'll work every time. (okay okay, mostly!!)

Page 2 of 4 FirstFirst 1234 LastLast

Similar Threads

  1. Fuel consuption request
    By BrianMay in forum FreeDrive
    Replies: 4
    Last Post: 10-27-2005, 12:15 PM
  2. Making my own shutoff switch
    By error_911 in forum Power Supplies
    Replies: 8
    Last Post: 03-12-2005, 06:29 PM
  3. Fao Uk Users - Re Fuel Protest
    By Dave^ in forum General MP3Car Discussion
    Replies: 0
    Last Post: 06-05-2004, 03:05 PM
  4. Air Filter and Fuel saver
    By Scorpnstail in forum Off Topic
    Replies: 14
    Last Post: 04-14-2004, 10:08 AM
  5. shutoff switch
    By dizzzyduck in forum General Hardware Discussion
    Replies: 7
    Last Post: 12-08-1999, 04:12 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •