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A trip to the dark side?

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Lucabeer View Drop Down
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Joined: 24 Jan 2009
Location: Torino, Italy
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Lucabeer Quote  Post ReplyReply Direct Link To This Post Posted: 20 hours 51 minutes ago at 2:18pm
Originally posted by Graham Slee Graham Slee wrote:

In an (ICE) car you have a small nominal 12VDC. Maximum power is reached when the load equals the battery internal resistance (possibly at cranking), so the voltage there is 6VDC. But then there is the charging current plus the regulation required for the F-V converter known as the alternator. Therefore your sensors and comparators have a hard time of it, but they expect you to do fantastic things.

I learned the hard way through making plug in temperature controls for plating lines, and the demands for process chemicals were often +/- 1.5C. If the installation electrician did not comprehend cable power losses, I'd end up the other end of the country trying to combat relay chatter and subsequent burn-out.

Yes, and the battery voltage severely drops according to loads, and to age of the battery due to increased internal resistance. So we have to compensate in the software for every sensor reading and every PWM actuator command, to take into account for voltage fluctuations. That's one advantage of doing things all digital, at least.

For sure, we have the advantage of dealing with much slower slewrates: usually we are dealing with 5-10ms sample rates, very often even with slower ones such as 100ms. Much easier than the bandwidth required by audio!

Controlling a temperature with such a small error? Crazy. The sensors themselves usually have a precision of +/- 1 degrees. And then you have cables, disturbances, and quantization. I would consider myself lucky with a global precision of +/- 2!!!!

Edited by Lucabeer - 20 hours 51 minutes ago at 2:18pm
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