engine hour sense

Printed From: the12volt.com
Forum Name: Mobile Video, GPS, and Navigation
Forum Discription: Mobile Video Head Units, DVD Players, LCD and TFT Monitors, Navigation, GPS, PS2, PS3, XBox, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=92202
Printed Date: June 10, 2024 at 11:53 AM

Topic: engine hour sense

Posted By: darknemesis
Subject: engine hour sense
Date Posted: March 27, 2007 at 5:25 PM

Hi All,

I need to know if there is a Positive or Negative Trigger that I can Tap into so I know that the Engine is running.

I work for a GPS Manufacture and our Locators can sense Ground from an Input. (Digital). Simple Installation through Ignition, Constant, Ground, BUT, I have a Request to MONITOR Engine HOURS.....Like on a Boat or Farm Tractor....So, what do I tap into to know if the Engine is running or not. a Grounding Output from something connected to a Pully would be Beautiful or something beter in a Cab.

Love to hear your thought.

Take Care

DARK-NEMESIS

Replies:

Posted By: fuzzynuts96813
Date Posted: March 28, 2007 at 2:33 AM

What we use on aircraft are simple pressure switches connected to a pressurized oil line. Very simple if you could tap into something like an oil cooler or trans cooler line (or something similar). Simply run power through the switch. You should be able to find a switch at any auto parts store.

Might be a little pain to install on a vehicle though. Just an idea anyway. Good Luck.

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Keep Free Speech Free

Posted By: KPierson
Date Posted: March 28, 2007 at 7:55 PM

You could use a 'pulse to constant' signal. Of course you would need to make sure you isolate the circuit input from the output. You could then use fuel injector pulses, crank angle sensors, etc.

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Kevin Pierson

Posted By: Mike M2
Date Posted: March 29, 2007 at 6:47 AM

In marine applications it's done two ways. Mercruiser uses oil pressure to sense the motor is running while Volvo uses current from the alternator. In boats this is important as the fuel needs to shut down if the motor stops and they use these siganls to do that...

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Mike M2
Tech Manager
CS Dealer Services

Posted By: darknemesis
Date Posted: March 29, 2007 at 5:40 PM

fuzzynuts96813 wrote:

What we use on aircraft are simple pressure switches connected to a pressurized oil line. Very simple if you could tap into something like an oil cooler or trans cooler line (or something similar). Simply run power through the switch. You should be able to find a switch at any auto parts store.
Might be a little pain to install on a vehicle though. Just an idea anyway. Good Luck.

Thank you for the Reply from all, these are all great thought.

We do use a Air Pressure Switch Part #: Honeywell Hobbs:

https://www.aircraftspruce.com/catalog/inpages/hobbsswitch.php

BUT, simplicity is a Key Factor, so, what about something in the CAR?

Thanks in advance.

Take Care