Quote:
Originally Posted by Dragoneye
It makes perfect sense:
A stuck throttle is a safety issue.
A fail-safe/redundant throttle sensor is not. It is to prevent the safety issue from becoming an...issue.
And I never defined a fail-safe.
The safety engineering should start at the throttle components, and thus make the "fail-safe" components unnecessary. I also said that there are other ways to overcome the issue that toyota is experiencing...only intended as support of my belief that they shouldn't be "made" to do anything.
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You don't quite appreciate the importance of a fail-safe. A fail-safe is a design such that when the components fail, they do so in a safe manner. And yes, you should expect components to fail. Murphy's Law of Engineering dictates that anything which can go wrong eventually will (yup, its more than just a joke). Knowing this, you can attempt design critical systems such that there is a safe failure mode, a fail safe.
In the cast of unintended acceleration (regardless of reason, be it from the pedal or internal software glitches), the fail safe is in the programing. If it reads moderate to high throttle and full braking pressure while at a non-zero speed, cut the fuel supply to the engine and shift transmission to neutral (for automatics).