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ClydeCrashkop
ICE Newbee
Joined: Aug 20, 2006
Posts: 8
Status: Offline
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 Posted:
Oct 05, 2006 - 06:47 AM |
 
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| Post subject: Twin engine sync indicator |
My best customer wants an indicator to help manually synchronize the RPMs on his 2 boat engines. He has an airplane with a sync gauge that has a propeller that spins one way or the other and stops when the engines are in sync. He really likes that and I thought I could put it on his boat. I can’t seem to find it online. There are a couple of gauges available but I don’t have room for their 4 inch diameter.
The Yanmar diesels put out a hall effect tach signal at about 200 pulses per rev from the flywheel ring gear. I think there is an AC tap on the alternators at 2 or 4 cycles per rev. I could probably do it with frequency to voltage converters, opamp, stepper driver and motor but somehow I thing there should be a simple analog way to do this. Any ideas? I know this would be a perfect place for a micro controller but I haven’t used them yet and need to keep the price reasonable.
Thank you
ClydeCrashkop |
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instruite
ICE Expert
Joined: May 29, 2006
Posts: 321
Location: Japan/India
Status: Offline
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| Posted:
Oct 05, 2006 - 10:40 PM |
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First to confirm you just want indication of the sync?
can you provide the links for the available guages so that it will give an idea exactly what you are looking for?
from the description you have given I could not understand what indicates that the engines are in sync or not?
are there two hall effects tach signals one for each engine?
check the below method of frequency comparison - http://www.edn.com/contents/images/122602di.pdf
http://www.newcircuits.com/chimage.php? ... msr006.gif
are you looking for something similar to above circuits? |
_________________
Instruite 
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Ideas that work,
Concepts that sell.
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ClydeCrashkop
ICE Newbee
Joined: Aug 20, 2006
Posts: 8
Status: Offline
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| Posted:
Oct 06, 2006 - 07:43 AM |
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Those may be helpful. Yes it has two hall effects tach signals one for each engine. I also need some indication of which engine is faster or slower as a reference to get them in sync. A bar graph would work if I have to. Faria is the brand name of the ones I saw. I will try to find a link after work.
Thank you
Clyde |
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ClydeCrashkop
ICE Newbee
Joined: Aug 20, 2006
Posts: 8
Status: Offline
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| Posted:
Oct 06, 2006 - 10:04 PM |
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instruite
ICE Expert
Joined: May 29, 2006
Posts: 321
Location: Japan/India
Status: Offline
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| Posted:
Oct 06, 2006 - 10:20 PM |
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do you want indication to be analog (meter) type or led type will also do?
I guess making LED type indicator will be bit chip
I will check/search some circuits and let you know bit later in the day |
_________________
Instruite
======================
Ideas that work,
Concepts that sell.
====================== |
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ClydeCrashkop
ICE Newbee
Joined: Aug 20, 2006
Posts: 8
Status: Offline
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| Posted:
Oct 07, 2006 - 10:44 AM |
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An LED type with 2 or 3 LEDs on each side of center would work and be compact. I could probably modify that circuit to slowly rotate a small motor (propeller) in either direction. That could also be analog if polarity reverses. |
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instruite
ICE Expert
Joined: May 29, 2006
Posts: 321
Location: Japan/India
Status: Offline
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| Posted:
Oct 09, 2006 - 07:52 PM |
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for this lets first decide on required complexity of the project
If only digital (LED type) is required then the circuit can be less simpler
can be developed from the combination of the 2 circuits (links I posted before)
In that case when speed is equal centre leds will glow
when speed of one motor is less/high (depends on what indication is required) all leds of that motor side will glow)
but if you want certain number of leds to glow depending on the difference in speed like for say 100 rpm difference 1 led for 200rpm 2 leds and so on then the circuit needs to be much more complex
so as I said before first its necessary to define the required complexity of the circuit |
_________________
Instruite
======================
Ideas that work,
Concepts that sell.
====================== |
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ClydeCrashkop
ICE Newbee
Joined: Aug 20, 2006
Posts: 8
Status: Offline
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| Posted:
Oct 10, 2006 - 07:48 PM |
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Hi Instruite
Once I get one of those working I’m sure my imagination will take over and it will evolve from there.
Thanks a lot
Clyde |
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instruite
ICE Expert
Joined: May 29, 2006
Posts: 321
Location: Japan/India
Status: Offline
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| Posted:
Oct 10, 2006 - 09:43 PM |
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| ClydeCrashkop wrote: |
Hi Instruite
Once I get one of those working I’m sure my imagination will take over and it will evolve from there.
Thanks a lot
Clyde |
keep us updated too with your circuit testing
which circuit of the above exactly are you presently testing? |
_________________
Instruite
======================
Ideas that work,
Concepts that sell.
====================== |
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ClydeCrashkop
ICE Newbee
Joined: Aug 20, 2006
Posts: 8
Status: Offline
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| Posted:
Oct 11, 2006 - 10:34 PM |
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I think I will start with the flip-flop/op amp circuit and add the combination you suggested. I will have to order parts and I will be pretty busy for a while so it may be a while before I make much progress but I will let you know how it turns out.
I did figure out how to cheat. (He he he) if I get one of their analog meters and replace their needle with an eccentric disk that would gradually uncover one of two photo transistors I could rotate that little motor at varying speeds in either direction. I could hide the meter but that would not be very elegant.
LOL
Thank you
Clyde |
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