Joat42 wrote:kzt wrote:And no, you can't just cut wires, because you have keeplives and polling going on, and in intelligently constructed systems this all timestamped and then encrypted. If you lose contact with the sensors designed to keep you from doing something horribly destructive you do not assume everything is cool. You assume something is horribly wrong and you get this:
https://www.youtube.com/watch?v=7qnd-hdmgfk
To expand on the topic, the more advanced the technology is you get less and less catastrophic failure modes (ie. things that go boom) - what happens is that things just stop working because "something" is wrong and all the interlocks kick in.
Of course, things that stop working at unfortunate moments may cause catastrophic accidents as a secondary effect.
Reminds me of my old '87 Porsche 944 - for an 80's car, it was an over complicated, electronic pain in the butt. I had a CV bolt break on the rear transaxle one fine morning on the way into work - sensors detected the torque imbalance on the transaxle and automatically disengaged the clutch so I wouldn't rip the transaxle apart driving down the road.
Of course I happened to be stopped at a traffic light, which was in one of "those" parts of town, and no matter what I tried, my zippy little car just wouldn't go.
Almost every problem on the car was like that - Once the rubber "limp-home" clutch failed spectacularly, jamming the actual, undamaged, clutch mechanism with rubber shards. another time a nearby lightening strike fried both the primary and secondary fan temp sensors, causing both radiator fans to stop working. A block temperature sensor detected dangerous temperature levels in the aluminum block and shut off the fuel pump while sending a cathedral's worth of bells ringing in alarm in the cabin as I drove down a country road.
If you ever hit the "soft" RPM redline (software limited to 6200 RPM - 1000 RPM less than the "hard" redline), the computers would shut down the second fuel rail, turn off "performance mode" if it was engaged, limit the fuel in the primary fuel rail and disengage the clutch - not a fun thing to happen when you are passing a truck in heavy traffic.
Everything was designed to stop you from damaging the car - or damaging it more than it already was. Nice, but annoying. As everything gets more advanced, these features become normal - but at the same time, the failure modes become less prevalent.