Author Topic: Inertia dyno  (Read 362 times)

0 Members and 0 Guests are viewing this topic.

Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 170
Re: Inertia dyno
« Reply #10 on: December 28, 2016, 11:42:07 pm »
Thks guys. I'll post some more pics thus weekend when I get the Sensors mounted.
Like Like x 1 View List

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: Inertia dyno
« Reply #11 on: January 04, 2017, 05:35:30 pm »
wish i could weld like that!!!  <<< 1972 cadillac

am doing some testing on a very low cost rpm sensor setup right now <$5 for DIY folks like me.  <<< 1972 volks bug
hiatus

Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 170
Re: Inertia dyno
« Reply #12 on: January 05, 2017, 11:54:01 am »
Joe, you get the noise issue resolved on your speed sensor test set up?

Adam

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: Inertia dyno
« Reply #13 on: January 05, 2017, 04:02:35 pm »
Joe, you get the noise issue resolved on your speed sensor test set up?

Adam

not as of yet.  getting closer to a clearer signal, literally by moving the sensor closer to the spinning magnet.  hahaha. 

along with noise was also getting harmonics?  maybe that is not what they are called.  multiples of the actual rpm.  if it read 150 rpm, would then get 300, 600 then some wacky 300000 stuff.

for non-electrical minded folks just like me, i am trying my stab at making an rpm sensor.  the rpm sensor is the thing you need to get a homebrew inertial dyno going.  the next step is software that i am using, tweaking the output raw data into a spreadsheet to work out hp and tq.  the software is very basic... and can be used as is........but it is lacking some things i hope to bring to the table.  software as is runs on any laptop.  older ones are better to use with it, imo.  my laptop is 2 (?) years old, and am trying to get the older software to recognize my sensor.

hope to make this all clearer as i go along.

later
hiatus

Online Nathaniel Vansickle

  • Piped Saw
  • *****
  • Posts: 458
  • Karma: 89
  • Location: Newcomerstown ,Ohio
Re: Inertia dyno
« Reply #14 on: January 06, 2017, 10:28:53 am »
Joe, you get the noise issue resolved on your speed sensor test set up?

Adam

not as of yet.  getting closer to a clearer signal, literally by moving the sensor closer to the spinning magnet.  hahaha. 

along with noise was also getting harmonics?  maybe that is not what they are called.  multiples of the actual rpm.  if it read 150 rpm, would then get 300, 600 then some wacky 300000 stuff.

for non-electrical minded folks just like me, i am trying my stab at making an rpm sensor.  the rpm sensor is the thing you need to get a homebrew inertial dyno going.  the next step is software that i am using, tweaking the output raw data into a spreadsheet to work out hp and tq.  the software is very basic... and can be used as is........but it is lacking some things i hope to bring to the table.  software as is runs on any laptop.  older ones are better to use with it, imo.  my laptop is 2 (?) years old, and am trying to get the older software to recognize my sensor.

hope to make this all clearer as i go along.

later

take a look at the universal cruise control kits if they are still available. Thats how they worked....magnet hose clamped to the driveshaft with a sensor mounted close by. installed allot of those systems back in the mid 90's.

if you can make your setup convert multiple pulses into a single revolution you could also use a tone ring off an axle and the ABS sensor....ford escapes have replaceable tone rings that are relatively cheap. i may even be able to come up with one of those to send you
5105H and 6400H in stock

Performance Outdoor Equipment
performanceoutdoorequipment.com
Dolmar, Echo, Jonsered

Informative Informative x 1 View List

Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 170
Re: Inertia dyno
« Reply #15 on: January 06, 2017, 08:25:38 pm »
Great idea Nate! Thank you.

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: Inertia dyno
« Reply #16 on: January 07, 2017, 07:06:11 pm »
Joe, you get the noise issue resolved on your speed sensor test set up?

Adam

not as of yet.  getting closer to a clearer signal, literally by moving the sensor closer to the spinning magnet.  hahaha. 

along with noise was also getting harmonics?  maybe that is not what they are called.  multiples of the actual rpm.  if it read 150 rpm, would then get 300, 600 then some wacky 300000 stuff.

for non-electrical minded folks just like me, i am trying my stab at making an rpm sensor.  the rpm sensor is the thing you need to get a homebrew inertial dyno going.  the next step is software that i am using, tweaking the output raw data into a spreadsheet to work out hp and tq.  the software is very basic... and can be used as is........but it is lacking some things i hope to bring to the table.  software as is runs on any laptop.  older ones are better to use with it, imo.  my laptop is 2 (?) years old, and am trying to get the older software to recognize my sensor.

hope to make this all clearer as i go along.

later

take a look at the universal cruise control kits if they are still available. Thats how they worked....magnet hose clamped to the driveshaft with a sensor mounted close by. installed allot of those systems back in the mid 90's.

if you can make your setup convert multiple pulses into a single revolution you could also use a tone ring off an axle and the ABS sensor....ford escapes have replaceable tone rings that are relatively cheap. i may even be able to come up with one of those to send you

cool idea.  appreciate the offer.  i do not know if the laptop would recognize the abs sensor signal?  the way this software works, it senses the rpm signal through the mic input. it could sense up to 2 different rpm signals, if i understand it correctly.  the rest of the sensors, up to 4 if used, run digitally somehow.  i do not have a handle on exactly how that works right now.

think the abs sensor reads the cogs off the wheel?  don't believe they are magnetic, but not sure.  something that reads magnets, like a crank wheel triggered ignition may work as well?

using a gutted out mic right now for a sensor.  the sensor test setup is attached to my lathe chuck.

the newer laptops use a 3 stripe input plug.  the software is set up for a 2 stripe plug.  going to order a splitter and a couple of spare input plugs to try to figure the pins out for wiring on the connector.  will be a week or so before they come in the mail.


hiatus

Online Nathaniel Vansickle

  • Piped Saw
  • *****
  • Posts: 458
  • Karma: 89
  • Location: Newcomerstown ,Ohio
Re: Inertia dyno
« Reply #17 on: January 09, 2017, 11:49:51 am »
ABS sensors are 2 wire and read the tone ring without a power input. ABS sensors create a voltage signal...most generally an AC voltage.

http://www.ebay.com/itm/A...AAOSwNyFWdcH5&vxp=mtr

http://www.ebay.com/itm/N...AAOSwal5YCdO4&vxp=mtr


crank sensors IIRC need external power to function, most are run on 5VDC. again IIRC crank sensors are generally 3 wire..... 5V reference, ground, signal wire. this may work the best if you can come up with a way to to provide the 5V reference voltage since the sensor is designed to only read a couple triggers in the 800-7000rpm range




I think what your system is measuring is the voltage spikes so an abs sensor sounds more like what you need and they just need a metal tab sticking out to provide a trigger which could easily be made without a tone ring. ABS sensor should provide a much cleaner signal than the gutted microphone but since ABS sensors are designed to multiple triggers i am not sure how irratic it would be with just one trigger and if the RPM would be sufficient  with one trigger to function correctly.

my quick math says an ABS sensor with a stock tone ring probably wont function at the RPM this thing will be doing. I came up with a tone ring having an average RPM of only 677 vs   your rig even if the tone ring was mounted on the jackshaft doing 1/4 the rpms of the saw it would still be doing 5-6 times the RPM that an ABS sensor is designed for. fewer triggers would effectively lesson the rpm that the abs sensor saw but at what cost to signal quality
5105H and 6400H in stock

Performance Outdoor Equipment
performanceoutdoorequipment.com
Dolmar, Echo, Jonsered

Like Like x 2 View List

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: Inertia dyno
« Reply #18 on: January 09, 2017, 05:26:38 pm »
with you....think it would work.  the bolt through hole would also help when fabbing an adjustable mount. 

it has to be sturdy vibration and wobble free from what i have tested so far.  has to hold against magnet pull.  has to be very close, about  .020" or so. 

the reason for the mic or headphones for sensor, is it what was recommended in one of the versions of the software.  another version recommends making a simple wound coil.

hope an electronic whiz could explain the signal better.  have read that there are 2 differing kinds of sensor types.
one is mag to mag.  another uses anything out of iron to mag.  have a couple of links on this i will post.  biggest thing i am guessing is it just has to be clean spike?

found that running my laptop on the charger causes some waves.  60hZ.  maybe this is the same hum you get when running an adapter charger on guitar effects?  on battery power he sig is clean on the laptop.  the mic/headphone is way sensitive, and needs attenuation or it goes off the scale.

no matter what anyone uses.....on a newer laptop, thinking you will need the things i have ordered to make it work to plug them into the laptop.

will post some dirty signals up to show what does not work so well.


hiatus

Offline 1manband

  • Nitro Hotsaw
  • *******
  • Posts: 759
  • Karma: 51
Re: Inertia dyno
« Reply #19 on: January 09, 2017, 05:29:39 pm »
will post the photos on the "how to board."
hiatus

 

Related Topics

  Subject / Started by Replies Last post
inertial dyno

Started by aclarke « 1 2 » Tool Shed

13 Replies
219 Views
Last post April 06, 2015, 10:00:57 am
by aclarke
1 Replies
40 Views
Last post January 18, 2017, 07:04:01 pm
by 1manband