oil pressure/fuel pressure safety

[jsiedlicki]

I vote for trip the engine kill like AFR/EGT safety. If your trying to save an engine, every second counts!

[Six_Shooter]

Why not make it user configurable? Let the user decide if they want the trigger condition to go to limp mode or kill mode.

[jsiedlicki]

Why not make it user configurable? Let the user decide if they want the trigger condition to go to limp mode or kill mode.

Just re-read this. Having it available as a limp mode trigger AND having the option to kill the engine is a win-win!

[Reverant]

Max should trigger a limp, min should (optionally for whoever wants it) trigger a shutdown after a specified period.

[jsmcortina]

Just to throw my own experience in here. On my Rover V8, I've had the bypass valve stick open a number of times after a pass down the drag strip. At high RPMs the pressure is fine but below say 1500RPM the pressure drops to nil. It can be driven back to the pits safely by keeping the revs up.

I like Reverant's suggestion.

James

[CMac89]

There's already a min/max curve vs. RPM and has been for a number of releases. It was simple to make this trigger limp mode (done for 1.5.x). How quickly should this respond? The other inputs to limp are on a delay of approx 1 second to reduce the chance of false triggers.

Or should it (optionally) trip the engine kill like AFR/EGT safety?

James

What's the limp home mode strategy? I think there should be both for different situations. Some engines, like mine, have a belt driven oil pump, so in the case where the belt breaks or flies off and oil pressure wants to go to zero, then i'd like it to recognize a calibratable oil pressure reduction velocity, for example, and shut off before it gets to zero. Other engines sometimes have oil pump drive shafts break or something else happened.

Then there are situations where if you rev the engine it'll get 60-70 psi of oil pressure, but hot idle is about 10-20 psi, so maybe low presssure should have a different strategy which wouldn't be engine kill.

Currently I have the low oil pressure shut down by shutting down the injector and coil power relays by a generic on/off output, but there isn't a good way to get it to ignore a starting condition (like a delay timer after engine cranking speed is surpassed), which takes time to build oil pressure. Maybe there is a way and i just don't know how to use the advanced condition well enough. It would be nice to have that output for other things though since I have ran out of them.

[masterx81]

about oil pressure warning, it's possible to correct min/max values based on oil temperature?

[jsmcortina]

Max should trigger a limp, min should (optionally for whoever wants it) trigger a shutdown after a specified period.

This is implemented for the next pre-1.5 alpha, due soon.

James

[krisr]

Max should trigger a limp, min should (optionally for whoever wants it) trigger a shutdown after a specified period.

This is implemented for the next pre-1.5 alpha, due soon.

James

James, you're a god amongst men!