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  • Disconnect battery while engine is running?

    I have an idea which is similar to home security system.

    A person enters the car turns on the ignition which turns on the carputer. Within a time frame that person has to enter a security code to disable a program which triggers the alarm. Further, the program would disconnect the battery and alternator via a relay switch rendering the car inoperable. The program would then take a snapshot of the driver via a webcam, dial into an ISP upload the picture and location of the car, then notify the owner that the alarm has been triggered.

    First question:
    While the car is running, disconnecting the battery and alternator would that kill the engine???

    Q2. Would it be possible to have a sensor which track movement? If the car is towed the sensor would trigger the carputer to turn on which then go through the identification process.

    Q3. Is there a third party program which takes the co-ordinates from the GPS and saves it as text?

  • #2
    Originally posted by l4tran

    First question:
    While the car is running, disconnecting the battery and alternator would that kill the engine???
    Not always, depends on the car.

    Originally posted by l4tran

    Q2. Would it be possible to have a sensor which track movement? If the car is towed the sensor would trigger the carputer to turn on which then go through the identification process.
    Your speed sensors would do the trick, just need to interpret their signal.
    2005 Ford Focus ST

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    • #3
      Originally posted by gospeed.racer
      Your speed sensors would do the trick, just need to interpret their signal.
      that wouldnt work if you car got towed away tho. since you dont spin the wheels do tow a Front wheel drive car.
      Pete Kastner www.KastNERD.com

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      • #4
        I wouldn't disconnect the alternator and batt, just cut off the ignition...
        List of front-ends/usefull apps
        XTroniC | XTroniC Direct

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        • #5
          and you can use any sensors used in a normal car-alarm system... just hook'em up via some input (serial, parallel, usb etc)...
          List of front-ends/usefull apps
          XTroniC | XTroniC Direct

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          • #6
            Yea, no need to tap alternator when you can just cutthe ignititon via a relay. Another system, is to just cut the Fuel Pump. If the engine won't get the fuel, it'll also cut out and stop running.

            But remember this also A real theif woh is experienced will go to all extremes. If he can't jack it, he'll destroy it. And further, if he really wants it, tow bed truck and off the car goes.
            Mark

            Website: http://www.greenpowerenthusiast.com/

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            • #7
              A lot of car alarms come with an ignition cut off relay. This will cut the ignition off, not allowing things like the fuel pumps, injectors, and spark plugs to operate.

              Another thing people do is cut off the fuel pump's power.
              Audio Rockford Fosgate: 900 Watt 4-channel amp, 501bd Mono amp
              Computer AMD 2400+ XP, 1 GB DDR RAM, Orbit Micro 250W DC-DC PSU

              Head units are for cheaters!
              sure some girls fake orgasms.....but it's guys like me who fake the whole relationship

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              • #8
                Hmm...is there anyway to stop the ol' tow truck?
                Mercedes Benz CLK 430

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                • #9
                  Originally posted by MoFo
                  Hmm...is there anyway to stop the ol' tow truck?
                  My only answer to this is hydraulics. I know that over here and over in Montana, thieves will put a car on a flatbed truck, and drive to Seattle to deal with it.

                  I'm sure a lot of you have seen show cars. A lot of them look so low that you can't drive them. Well, that's what the hydraulics help with. The car is lowered to the point where it rests on its chassis, and when you want to drive, it rises up. It becomes nearly impossible to put on a flatbed or any kind of tow truck at that point.

                  And for us FWD people, use your e-brake, and leave it in gear!
                  Audio Rockford Fosgate: 900 Watt 4-channel amp, 501bd Mono amp
                  Computer AMD 2400+ XP, 1 GB DDR RAM, Orbit Micro 250W DC-DC PSU

                  Head units are for cheaters!
                  sure some girls fake orgasms.....but it's guys like me who fake the whole relationship

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                  • #10
                    You could always keep your computer running at all times ... off a hidden tank battery perhaps. You could set it up to wirelessly forward it's location to you at all times. If they take it, you'll know where it is. It's basically the Lo-Jack premise. If lots of people started to do this, thieves would just as quickly come up with a counter measure.

                    Ultimately, your best protection (if you want it) is to buy insurance against theft. Then pray like hell if they do take it that it's not found before your Insurance pays the total loss.
                    2004 4runner

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                    • #11
                      Originally posted by lgbr
                      A lot of car alarms come with an ignition cut off relay. This will cut the ignition off, not allowing things like the fuel pumps, injectors, and spark plugs to operate.
                      My car has no spark plugs, no computer to manage the engine, and a mechanical fuel pump. Erm, relay, erm, what do I do with that again.

                      Once my engine is started, I could remove the battery from my car completely and the engine would still run. Diesels, don't ya love em.
                      Old Systems retired due to new car
                      New system at design/prototype stage on BeagleBoard.

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                      • #12
                        Older diesels only need battery/alternator to power the starter and headlights. so yeah, you can do that.

                        Unfortunately your car is way behind on the technology. There hasn't been a new car sold in america without fuel injection since 1990 (last was the Subaru Justy).
                        Audio Rockford Fosgate: 900 Watt 4-channel amp, 501bd Mono amp
                        Computer AMD 2400+ XP, 1 GB DDR RAM, Orbit Micro 250W DC-DC PSU

                        Head units are for cheaters!
                        sure some girls fake orgasms.....but it's guys like me who fake the whole relationship

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                        • #13
                          Originally posted by lgbr
                          Unfortunately your car is way behind on the technology. There hasn't been a new car sold in america without fuel injection since 1990 (last was the Subaru Justy).
                          My car has fuel injectors. It has a mechanical injector pump and mechanical injectors. Your assumption that my car doesn't have fuel injection is false.


                          Edit: To clarify, here are the specs for my engine. Mine is the 1.5TD: http://www.corsasport.co.uk/board/vi....php?tid=44333

                          It uses 2 jet Pintaux, ID NP-DN OPD N 108 injectors. Not bad for an engine without fuel injection, huh?
                          Old Systems retired due to new car
                          New system at design/prototype stage on BeagleBoard.

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                          • #14
                            Originally posted by l4tran
                            While the car is running, disconnecting the battery and alternator would that kill the engine??
                            Probably not, but it's a real good way of blowing up your alternator. The output transistors in the regulator don't really like not having a load on them.
                            Never let the truth get in the way of a good story

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                            • #15
                              Haven't seen ANY diesel without injection in a vehicle EVER... would you put in some diesel carburettors? To vaporize the diesel-OIL?

                              I don't think so

                              BUT, your car must have some system (probably an electrical valve in the fuel-line) to shut off the engine when you turn off the key. On the other hand, I know some older mercedes used to have a pneumatic system for that (and the central locking!).
                              List of front-ends/usefull apps
                              XTroniC | XTroniC Direct

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