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???
02/28/08 03:29
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#151581 - safety concerns
Responding to: ???'s previous message
Hi Russell,

Thank you for your post! I absolutely agree with you 100%. I will start by saying this project is my graduate thesis project for my Masters in Mfg. Engineering. I got my B.S. in Mech. Eng. so all this embedded systems business is new to me...although I'm sure that's obvious to you experts ;-) Second, and most importantly, this system is NOT being used on an automobile.

Unlike a traditional ABS system for hydraulic brakes that has multiple modulator valves, sensors, etc. this sytem does not. Without giving too much away, this system and application does not utilize any hydraulic components. With the exception of some square tooth tone rings (aka sensor rings) that I've CNC machined, all control and feedback is strictly electrical. To the best of my knowledge, this system is the first of its kind.

That's not to say electrical components do not fail, I have seen them fail when working with PLC control systems for industrial equipment. This first design is strictly a proof-of-concept and is not automobile related, nor will it ever see a public road. Regardless, safety is always priority number one and all precautions are being taken. In the event of a failure, a redundant mechanical system IS in place and the software "fault detection" scheme that you described will also be utilized as the system design progresses.

I have also built a benchtop testing rig that essentially mimics the real-life application so I can do most of my testing and debugging without ever leaving the lab. It's no substitute for the real-world but it will help expose any obvious flaws before taking the testing full scale.

Safety is ALWAYS the number one priority and believe me, my advisors wouldn't have it any other way! :-)

Thank you all again very much for your time,
Brian



List of 40 messages in thread
TopicAuthorDate
P3.5 input problem            01/01/70 00:00      
   100k is way too large            01/01/70 00:00      
      Yup            01/01/70 00:00      
      ports1-3 vs. port0            01/01/70 00:00      
      a small correction            01/01/70 00:00      
   Page 4 datasheet says            01/01/70 00:00      
      Calculating the maximum resistor            01/01/70 00:00      
         Calculating the ...            01/01/70 00:00      
   80uA is not a maximum specification            01/01/70 00:00      
      re:resistor            01/01/70 00:00      
   Resistor            01/01/70 00:00      
      I would not            01/01/70 00:00      
         Resistor            01/01/70 00:00      
            Resistor ... again ...            01/01/70 00:00      
      basic troubleshooting first            01/01/70 00:00      
         the sensor and its application            01/01/70 00:00      
            Oh, max frequency is ~4kHz :-)            01/01/70 00:00      
         Please ignore the "basic troubleshooting"            01/01/70 00:00      
         pray tell why            01/01/70 00:00      
            Capacitance problems ...            01/01/70 00:00      
   You have totally misunderstood the situation            01/01/70 00:00      
      thank you Kai            01/01/70 00:00      
         maybe it is            01/01/70 00:00      
            Link in original post            01/01/70 00:00      
            datasheet            01/01/70 00:00      
         Being paranoid is a good attitude...            01/01/70 00:00      
            Paranoia medicine            01/01/70 00:00      
               Yes, perfect, i also thought about this...            01/01/70 00:00      
                  the "industrial strength" 485 transciever            01/01/70 00:00      
                     But they gaurantee this            01/01/70 00:00      
      But the micro port shouldn't be driving anything            01/01/70 00:00      
         Missing the boat.            01/01/70 00:00      
            Waving at the boat.....            01/01/70 00:00      
               wrong place (in some instances)            01/01/70 00:00      
            More about the P3.5 pull-up issue            01/01/70 00:00      
               one simple way            01/01/70 00:00      
               AT89S8252            01/01/70 00:00      
         Please read this...            01/01/70 00:00      
   ABS & Safety            01/01/70 00:00      
      safety concerns            01/01/70 00:00      

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