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engine instrumentation product query
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Do you like the idea?
No
60%
 60%  [ 3 ]
Yes
40%
 40%  [ 2 ]
Total Votes : 5

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zopapp
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PostPosted: Thu Sep 10, 2020 7:49 am    Post subject: engine instrumentation product query Reply with quote

Hi All,

I am an electronics engineer and would like to build a product that may be of interest to you. I own a T25 with an air cooled T4 engine which I have rebuilt recently. During the tune-up (and also the debug before the rebuild) it would have been very nice if I could have monitored various engine parameters. This gave me an idea of building such a device. Here is what I have in mind briefly.

Various sensors attached (preferably non-intrusively) to the engine (like: tacho, ignition timing, head temperature, AFR, throttle position, oil temperature, oil pressure) sending their signals into a host unit in the engine bay that in turn relays the info wireless to your smartphone. Data is then logged and stored and may be displayed live on the dash.

Application of such a device could span over engine health monitoring, engine performance comparison between vehicles alike, tune-up validation etc..

Id appreciate if you could give me any feedback on the idea for me to start off on the right track. I am also keen to talk to people who find the idea appealing, so please let me know.

Many Thanks,
Zoltan
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old DKP driver
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PostPosted: Thu Sep 10, 2020 8:20 am    Post subject: Re: engine instrumentation product query Reply with quote

Im picturing an older person that has just woken up after sleeping for 25
Years. CanBus technology is what we have been using for the last 25 years
Notice the word (bus)
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alman72
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PostPosted: Thu Sep 10, 2020 10:14 am    Post subject: Re: engine instrumentation product query Reply with quote

interested in what you come up with.
Dude, where's my bus?!
(Zoltan reference)
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my59
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PostPosted: Thu Sep 10, 2020 11:38 am    Post subject: Re: engine instrumentation product query Reply with quote

Head temp at all 4 cylinders displayed simultaneously.
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Glenn Premium Member
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PostPosted: Thu Sep 10, 2020 11:42 am    Post subject: Re: engine instrumentation product query Reply with quote

I would look what's generally monitored on a piston airplane engine.
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a-marshal
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PostPosted: Thu Sep 10, 2020 12:25 pm    Post subject: Re: engine instrumentation product query Reply with quote

There are a couple threads about doing this with an Arduino, I've been running a simple version (CHT on 1 & 3 plus oil temp) for a couple years now.

I'm sure there would be a market for a more robust version... especially if it would talk to my phone.
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timvw7476
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PostPosted: Thu Sep 10, 2020 2:38 pm    Post subject: Re: engine instrumentation product query Reply with quote

I drive a '76 with carbs & points & solid lifters so I can stay far away from that.
But I have to check clearances every 4-5k to know it's still alright.
Cheap. But one hour of labor is involved. Every 4-5k.
No downvote, some people LOVE extra gauges.
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zopapp
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PostPosted: Sun Sep 13, 2020 2:23 am    Post subject: Re: engine instrumentation product query Reply with quote

Thanks all the feedback guys. Much appreciated.
Will let u know if someting shapes up from this.

Cheers,
Zoltan
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mikedjames
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PostPosted: Sun Sep 13, 2020 12:51 pm    Post subject: Re: engine instrumentation product query Reply with quote

I have a sensor box with an STM32 ARM MCU in it - collects pressures and temperatures and voltages in the engine bay, daisy chained with a PLX Devices AFR sensor box.

These use the PLX Devices data bus format which is based on 3.3 volt level serial data (not CAN bus). When I get to updating it I will use CAN bus instead, because it is designed to work in a car, and the STM32 MCUs have CAN interfaces on them.

So there is a single 2 core cable coming from the engine bay.


My smartphone is running satnav and mp3 playback, there is no screen space for gauges.

On the dashboard I have separate OLED screens on another small STM32 ARM MCU (STM32F103, boards available for a couple of dollars/pounds/euros) . This does have a Bluetooth module connected to it, but I have never bothered writing an app to display the data.


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kerian159
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PostPosted: Mon Sep 14, 2020 5:08 am    Post subject: Re: engine instrumentation product query Reply with quote

This is a thread I started a while back and have updated with an Arduino based setup that actually works. Currently it gives you all four CHT, Oil PSI, Oil Temp, and Battery Voltage. Plans for the future include and are not limited to Tire PSI, RPM gauge, and AFM Ratio monitor (that's all that's coming to my brain at the moment) but for now i'm just trying to get it installed into the vehicle.

https://www.thesamba.com/vw/forum/viewtopic.php?t=683325&highlight=
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