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Old 25-11-16, 05:08 PM   #1
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Default Cruise Control Failure?

Mods please remove if you think this is inappropriate or irrelevant, but I'd be interested in other technical opinions on this (in the news).

Harrow driver 'called 999 as his out-of-control Skoda sped along a motorway at 119mph' | Daily Mail Online

Obviously there is a lot of speculation to be made here, but my question more is whether the following sequence of events could be valid. I don't wish to direct this at Skoda or any other manufacturer, it's merely a potentially interesting point about the total reliance on electronics?

The Pedal Position Sensor malfunctions somehow, hence the ECU "thinking" the accelerator is 100% depressed (which is what the subsequent investigator said). This will put the CC or speed limiter system into kickdown mode, overriding it. Assuming it's an automatic gearbox that presumably wouldn't switch to neutral at speed/high RPM. The electronic handbrake will cease to work, because it won't engage at speed (is this true?).

One of the comments mentioned that some modern cars are even fitted with fly-by-wire brakes now?
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Old 25-11-16, 05:29 PM   #2
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Why did they not tell him to put it in neutral it may rev the nuts off the engine but would be able to stop.

I would have thought they would also have a fail safe in the ecu software (maybe they had no room due to the emission cheating software).

When i had a brake switch fail on my 307 HDI the engine dropped to idle even with my foot on the floor.

When i found fault and did a test and found that when driving with the throttle pedal pressed if you also press the brake pedal (enough to switch on brake lights) after around 15 sec the engine would drop to idle and ignore the throttle pedal position until you release they brake

Must try it on the DS and see what happens
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