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Originally posted by thedarklingthrush
911 stinks, I was wondering if you could reconcile two parts of your post for me.
1.) The video which claims to recreate the sudden accelerator
2.) The snippet later claims "The effects of EMI have proven costly and impossible to duplicate since its discovery"
How did that scientist recreate something that its apparently impossible to recreate?
I think you are talking about two different things here...
[edit on 2-3-2010 by thedarklingthrush]
Exponent has so far been unable to induce, through electrical disturbances to the system, either unintended acceleration or behavior that might be a precursor to such an event, despite concerted efforts toward this goal," concludes the preliminary study which has been shared with lawmakers planning hearings on Toyota's safety record.
There's certainly - at the bottom of the page, you can see various antenna that are broadcasting, cellular TV, radio antennas, as well as your typical noise sources, such as power lines and electrostatic discharge. That's just from the humans themselves operating the equipment in the vehicle.
From our test standards, we develop our performance target. These are both done at a design and a test strategy. As you can see from the slide, the component level and the vehicle level from a design perspective need to meet or exceed the international standard.
Originally posted by kinda kurious
I am grateful for this thread. My elderly Mother-In-Law has a Camry and despite having the mod done is still scared to drive it. Her car is 2 years old and has less than 5,000 miles on it. She cannot financially afford to simply dump the car at a loss, so her family is all kicking in to get her another car and absorb the loss on the value she will lose. $$$
[edit on 2-3-2010 by kinda kurious]
Originally posted by Pilgrum
Nice post.
I'm not clear on what the design engineers have done here because all the recent model cars I've worked on have a physical mechanical cable (non-electric) connecting the accelerator pedal to the air flow control on the manifold so there's no way it can open (the air-flow control) without human input by depressing the pedal.
Originally posted by ownbestenemy
Anyone know of a place to grab a hold of the schematics for the accelerator circuit? I would love to analyze it...
Not for pass-time sake, but for professional sake of course
[edit on 2-3-2010 by ownbestenemy]
Originally posted by DeepBlueSeas
The important part though is that the Powertrain/engine control module does not rely only on the accelerator pedal position sensor. These modern drive by wire vehicles have what are known as fault management strategies. They use several signals from several sensors to self check the signals it is receiving and prevent issues These strategies are there to prevent things like uncontrolled acceleration, by cross-checking the data it is receiving against redundant sensors and other inputs. For example the Ford 7.3L diesel engines use three signals to indicate accelerator pedal position and relies on other inputs from the engine as well. Simply put, if these signals don't agree or are out of spec then the engine will derate power and only run at idle.
This isn't to say that there are issues with the Toyota design, programming or fault management strategies, but it's far more complicated and far safer than most people who don't work on them would understand. I don't work on many toyotas as I'm on the heavy duty side of things and can't speak to the actual issues with them but it isn't as simple as most think. It's not like there's a wire straight from the gas pedal to the fuel injectors, there is a lot more to it. Within that system there are numerous self-checks and safety measures.
Originally posted by ownbestenemy
reply to post by 911stinks
Thanks for that but the breakout box is test equipment, not the schematics. Still yields information though
I doubt though one could find the schematics for Toyota's accelerator assembly as they probably are considered proprietary.