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  (Source: Warner Brothers)

Could cosmic rays be blame for unintended acceleration in Toyota vehicles and crashes? The National Highway Traffic Safety Administration is investigating the possibility, which was raised by an industry tipster.  (Source:
Could outer space be endangering Toyota's drivers?

Whether individual reports of runaway Priuses are true or not, the sheer number of complaints and accidents would indicate that many vehicles in Toyota's lineup may have deep underlying issues. These issues are exacerbated by the fact that many American drivers are unaware of all the means at their disposal to stop their vehicles.

The feds are now examining a rather wild theory -- that cosmic radiation may be causing some of Toyota's electrical issues.  The feds received an anonymous tip from an industry source that Toyota's microprocessors, memory chips and software may be more sensitive to cosmic rays than its competitors, causing increased incidences of malfunctions.  Such problems are commonplace with airplanes or spaceships, raising the need for extremely robust electronic designs.

Sung Chung, who runs a California testing firm, says he believes the tipster may be correct.  He states, "I think it could be a real issue with Toyota.  [But] nobody wants to come out and say we have issues and we need to test."

Electrical interference could help to explain the unintended acceleration afflicting 13 models across Toyota's lineup, or about 5.6 million vehicles in total.  While software and hardware can compensate, to an extent for cosmic interference, cosmic rays can potentially cause the kind of unrepeatable "single event upsets" that could add up to many of the 3,000 complaints against Toyota received by the National Highway Traffic Safety Administration since 2000.

William Price, who worked at a jet propulsion laboratory studying extraterrestrial electromagnetic interference (EMI) for 20 years, comments, "[It] occurs virtually anywhere.  It doesn't happen in a certain locale like you would expect in an electromagnetic problem from a radio tower or something else."

A Toyota spokesperson in a brief comment to said that Toyota's protections against extraterrestrial EMI were "robust against this type of interference" and that its vehicles featured "absolute reliability".

Toyota may not be the only one susceptible to cosmic EMI, though.  Other manufacturers likely would have similar occurrences even in more reliable designs, albeit less frequently.

Cosmic EMI may turn out to be of little concern, or it may turn out to be a major problem with the increased use of in car electronics.  The auto industry used to use mechanical links, but now uses electrical throttle controls to save weight and space, and make other technologies possible, such as stability control.  Those benefits could come at a cost, though.


There's a lot of confusion about what "cosmic interference" or "cosmic EMI" is.  "Cosmic interference" or "cosmic radiation" can mean one of two things:
First, disruption due to cosmic rays, which are primarily composed of protons (hydrogen ions), helium nuclei (alpha particles), and high energy electrons.  Secondly, cosmic bodies like the sun can transmit self-propagating electromagnetic waves through the vacuum.  These waves can be referred to as "cosmic EMI".  Cosmic particles can also cause damage, but aren't referred to as EMI.  This article is referring to both cosmic rays and cosmic electromagnetic radiation.

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The Prius acceleration problem is widespread
By troysavary on 3/17/2010 12:15:45 AM , Rating: 3
We only hear about the incidents where it caused a crash, but it happens all the time. Breaking while driving over a bump apparently causes it. One Prius owner stated that it happens so often that he knows which parts of the road on his drive home are likely to cause it and is ready to compensate.

By Lerianis on 3/17/2010 6:07:31 AM , Rating: 2
Ah, if this is true..... then this is coming from something on all of these cars not being bolted or pressed into place correctly! I.E. the whole 'for every action, there is a 'reaction' is coming into play, and when you slow down.... some part of the car is MOVING out of place and sending random junk data to the computer on these electronic gas pedal cars.

By porkpie on 3/17/2010 9:43:57 AM , Rating: 2
"Breaking while driving over a bump apparently causes it"

Your post was from an idiot driver who doesn't realize when ANY car with ABS goes over a very bumpy surface, the brakes are going "stop working" briefly, because the tyres have lost traction, and the ABS is preventing you from skidding. If you're braking at the time, the ABS kicking in will feel like "sudden acceleration", when you've really just stopped decelerating.

The NHTSA has tested just this scenario (not just with Priuses, but with many other vehicles). In their opinion, they consider the very slight increase in stopping distance to be worth the additional driving control.

BTW, did you read the actual STORY in your link? Let me quote:

Three main points counter the allegation that the Prius has a tendency to accelerate out of control, endangering its drivers.
(1) Proportionally, complaints about the Prius occur no more often than for other vehicles.
(2) No vehicle can out-accelerate its brakes
(3) "Sudden acceleration" has never been proven in any vehicle

“So far we have not seen a single Android device that does not infringe on our patents." -- Microsoft General Counsel Brad Smith

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