diesel injector line speed pickup
diesel injector line speed pickup
(OP)
I am trying to find a simple way to record the rpm of a diesel engine with my data acquisition system. Unfortunately many of the machines I am working on do not have pre-taped holes in the bellhousing to sense the ring gear. And I don't want to resorting to installing hall effect sensors, light sensors, etc. for time reasons.
I would like to use the sensors that measure fuel line expansion for use with a tach or timing light. (see link below for example)
http://w ww.avldite st.com/wEn glish/prod ucts/speed Measuremen ts/ClampOn Transducer s/Klemmgeb er_KG60_En glisch.pdf ?navid=115
These are quick to install and I can buy the sensors for $60 each. But I'm not sure how to interface them to my data acquisition. I'm pretty sure they are piezo based, and I'm guessing that they are ICP because the cabling is nothing special. I have ICP cabability already.
Thanks in advance for any help. ISZ
I would like to use the sensors that measure fuel line expansion for use with a tach or timing light. (see link below for example)
http://w
These are quick to install and I can buy the sensors for $60 each. But I'm not sure how to interface them to my data acquisition. I'm pretty sure they are piezo based, and I'm guessing that they are ICP because the cabling is nothing special. I have ICP cabability already.
Thanks in advance for any help. ISZ





RE: diesel injector line speed pickup
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: diesel injector line speed pickup
ISZ
RE: diesel injector line speed pickup
Unless you're working on old engines, you can probably find a usable signal coming out of the engine's ECU. E.g. Deere ECUs I think send a 5V square wave at 30cycles/rev or so.
Mike Halloran
Pembroke Pines, FL, USA
RE: diesel injector line speed pickup
I've used an older version of these clamp on devices, which came with its own signal conditioning box, they aren't especially straightforward to use, with the occasional dropout etc.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: diesel injector line speed pickup
Could try http://w
for a bit of research.
Bill
RE: diesel injector line speed pickup
RE: diesel injector line speed pickup
RE: diesel injector line speed pickup
I hadn't heard of that before. I assume that if the clamping force is sufficient this wouldn't be necessary?
Ron - alternator output
I know that on one machine that had a light pick-up installed the output of the alternator is off by ~7%. This might be good enough for some of my tests but not others.
Carnage1 - That is what I am trying to do, but I want to know if I can hook up this type of sensor like an ICP accelerometer. I can condition the signal with my data acquisition system to take the 1 pulse/2 revs into account.
Thanks, ISZ
RE: diesel injector line speed pickup
RE: diesel injector line speed pickup
ISZ
RE: diesel injector line speed pickup
The frequency will be directly proportional to engine speed, unless of course, the alternator drive belt slips.
Any inacuracies you see are likley calibration errors in the tachometer head. If you monitor the frequency accurately, you should have little or no error.
Ron
RE: diesel injector line speed pickup
ISZ
RE: diesel injector line speed pickup
I trimmed up a Piezo buzzer element from a buzzer and soldered this onto the Rod and then filed it down to size approx 4mm wide by 10mm long on the side of a small length of 6mm rod 20mm long and finished it off with heatshrink tube to insulate the assy and a made a small U shaped clamp to fix this against the Inj line.
The rest of it was a transistor amplifier that was used to trigger a MOSFET and a small coil (2 turns or so) of wire that used in series with a 50ohm resistor ... simply the MOSFET was creating a short circuit in the loop. 9V Batt > 50ohm R > MOSFET > 2T Coil > GND and the small signal from the Piezo element was triggering the FET.
Google for "measurement specialist Piezo film sensors Aug 98" there was a bunch of pdf's available. I dont have all the pdf's for this but you may find enough info in the above.
NOT2FAST