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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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By Shining Arcanine on 3/16/2010 8:09:03 PM , Rating: 2
You still need a computer to decide which of the three is right. :/

By randomly on 3/16/2010 8:37:55 PM , Rating: 5
No, the data streams of the three computers are compared by a voting circuit which flags the odd data out and sends the bad computer off to sit in the corner.

You can certainly minimize catastrophic problems caused by SEU with proper programming. Bounds checking of I/O and data, COP (computer operating properly) reset timers, check sum verification of firmware, etc. Rebooting an engine controller can be done in milliseconds since program memory is non-volatile and the amount of program and data memory is really quite small.

If you make the effort you can certainly get an engine computer to detect improper operation and handle it gracefully. It is a non-trivial task however.

By Alexvrb on 3/16/2010 11:57:13 PM , Rating: 2
You could just use a single module with a little bit of internal redundancy. The other issue is with sensors. If all of your computers are fed by a single sensor, and that sensor is faulty, they would all be fed the same data. So you really need multiple sensors too, if you're really going the paranoid route.

Or you could just use limp mode and/or safe defaults if a major issue is detected (sensor value out of expected range, etc), which all manufacturers do, and put in robust computers. Plus throw in a brake override switch, that has the computer close the throttle whenever the primary brakes are depressed.

By randomly on 3/17/2010 2:20:41 AM , Rating: 3
I don't think I was clear in my previous post but you can do all those things I mentioned in my previous post with a single processor and those techniques are used fairly often. Bounds checking sensor data can go a long ways toward detecting faulty sensors. Many sensor types will fail at one extreme or another, which will be outside the range of normal output values and so you can detect the failure. There are also ways of monitoring sensors to see if they are operating within expected parameters. Gas pedals jammed by floor mats is another matter.

In the case of brakes there can be a pedal position sensor and also a pedal depressed switch or sensor. So there can be sensor redundancy, and it's not paranoid to do that. If either brake pedal sensor reads as depressed then the throttle is driven to zero.

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