Dyno Ignition Timing

[JMBacker]

I am exploring the possibility of writing a program for an engine test stand to control the engine ignition timing.  I am having trouble coming up with the concept of how to write this though.  Basically, we would have an encoder spinning with the crankshaft, and I would need to turn on a digital output during certain encoder counts.  For example, if I was using a 100PPR encoder, running an 8 cylinder engine, I would need to turn on an output during the 1st count, 26th count, 51st count, and 76th count, and reset the counter at the 100th count, or at a home signal.

I have tried to write this program, but the way I have done it requires processing, which takes too much time, resulting in missed output pulses at higher frequencies.  In fact, it only worked consistently at very low frequencies.

I need to know if there is some way to make an output go high based directly on the count of a counter?  Thanks for any help.

Jeremy

[vt92]

You need to use hardware triggering.

See if this info helps:

https://www.ni.com/en/support/documentation/supplemental/21/ni-daqmx-data-acquisition-triggering-tec...