temperature to fuel cut off switch
temperature to fuel cut off switch
(OP)
my mitsubishi diesel has a common problem of over heating, causing the cylinder head to warp, and crack on cooldown. I want to build a temperature sensitive device,which will activate the fuel cut off switch, thus stopping the engine before it overheats. How can I link the temp thermistor to the fuel cut off solenoid, to work at say 95 degrees centigrade? Most boat engines have an alarm buzzer which activates before overheating. how does this work for an NTC thermistor unit?
your help is appreciated.
your help is appreciated.





RE: temperature to fuel cut off switch
A shut off switch like u describe is not a good idea.
What if it shuts off halfway through an intersection, across a railway crossing?
I have seen tractors with shut off switches for loss of oil pressure, but with an override switch for those rare cases where it is not in a paddock and needs to be moved in a hurry.
www.retallickeng.com.au
Was told it couldnt be done, so
i went and did it!
RE: temperature to fuel cut off switch
You might look into Murphy products.
http://ww
RE: temperature to fuel cut off switch
There is also their SWITCHGAGE line which has been around for about half a century.
http://www.fwmurphy.co.uk/products/swichgage.htm
RE: temperature to fuel cut off switch
Oops, almost forgot the very popular Kysor engine protection products.
h
RE: temperature to fuel cut off switch
RE: temperature to fuel cut off switch
If I had to do something to protect from overheat damage, I would have the sensor trigger a very obvious warning, like big bright flashing warning light on top of the dash in drivers line of normal sight and a loud alarm.
Engines do not suddenly self destruct at a certain temperature, as the temperature rises, there is a range of increasing danger and rate of decay. This allows a short time for corrective action to be taken by the driver, even if it is only lift off to slow down until it can be safely parked.
If drivers deliberately drive a car knowing serious damage might result, then I think they deserve the repair bill. They certainly deserve it a lot more than the following traffic deserves to be confronted by a car that stops suddenly in the middle of a freeway.
Regards
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RE: temperature to fuel cut off switch
The difference is that the head temp sensor senses metal temperature and not coolant temp. This way the engine control module can make more strategic use of calibrations to try and avoid head casting problems.
Bill
RE: temperature to fuel cut off switch
RE: temperature to fuel cut off switch
The better shut downs do give you a warning first. You should look into them a bit before making hasty judgements. Most truck OEM's now have either a delayed shut down or staged limp home mode. The ECU will protect the engine. Common practice and sense, would have a warning before shut down.
RE: temperature to fuel cut off switch
RE: temperature to fuel cut off switch