Microcontroller - Automotive Timing Resolution Needed
How much precision in mS or uS does a micro-controller need to properly control timing +/- .5deg. I'm trying to use a micro to delay the charge time on my Toyota COP's. But, according to my scope I'm firing the coils (going low) late by about .02mS.
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0.5* at 7200 RPM is 12 us.
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Simple math, really.
7,000 RPM is 117 revolutions per second, or put another way, 42,000° of crank rotation per second. So one degree of crank rotation is 1/42000 of a second, or about 0.024 milliseconds. Thus, your 0.02ms error is slightly less than one degree. That's pretty trivial. edit: Jason beats me to it. :D |
And Now I Know
So, being off .5deg at 7200rpm is probably ok? Thanks Guys |
Originally Posted by kingofl337
(Post 778180)
And Now I Know
So, being off .5deg at 7200rpm is probably ok? Thanks Guys |
If it's ALWAYS 0.02 ms too late, you might be able to build some compensation factor into the software.
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