How do I convert pulses to RPM in simulink 2017a

Hi,

I would like to know how to measure the time between 2 pulses occuring so I can calculate the RPM.

Ideally I want to calculate the time from 10 pulses ago and divide it that way to get a better accuracy. Happy to lose some signal accuracy/response for a smoother signal.

Any help is appreciated.

Thanks

Quent

Answer 1

[Mathieu NOE]

hello

this is my version, converted to R2017a

hope it helps

it runs at fixed step = 1/Fs with Fs = 1e5

Answer 2

[Mathieu NOE]

hello

you basically need a counter that will be reset at each trigger (pulse) signal

the counter max value will give you (according to the sampling rate) the period, so you can easily convert that to frequency or RPM

to smooth it out, you can then apply a low pass filter (that will give you the same result as averaging over x events)

[heng zhang]

Can I see your simple simulink design of converting pulses to frequency in simulink 2017a?

Can one simple simulink design of converting pulses to frequency in simulink 2017a settle the pulses of constant speed, constant acceleration,variable speed ?

Thanks very much.

[quentin hay]

See attached screenshot. Think I just did if last value was less than tthreshold and new value is greater than thresthold then count is equal to count plus one. Hope that helps in some way. The rest is just a moving average and filter

[quentin hay]

[quentin hay]

Answer 3

[heng zhang]

Dear Mathieu NOE，Thanks very much for your help.

Answer 4

[heng zhang]

Dear quentin hay ，Thanks very much for your help.