Whoops! first VW and now Renault?

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Looks like very care use of wording to me. "No cheat *devices* used". Hmmm, how about software though?

Tim

Reply to
Tim+
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I can't really believe the makers of the injection equipment - Bosch etc - are totally innocent in all this. They'd surely have had examples of any production model through their hands and notice if the software had been altered?

The development of such software is always going to be shared between the maker and customer - in this case VW or whatever.

Reply to
Dave Plowman (News)

The VW "cheat device" WAS software. It detects the low load operation, lack of steering input, failure to indicate when pulling off etc and switches to a lower emissions mode. Switches back to "normal" after a few seconds of pedal to the metal. This gives the normal driver a better low end response but higher emissions and fuel consumption.

What the other makers say they don't do, is actually detect the test mode and switch engine operation. The engine response, performance and emissions are the same on road as on test for the same throttle angle, gear and speed.

They all have different "maps" for the low load gentle acceleration profile with a granny driver that the Emissions test uses and the high load profile that is used by a balls out pedal to the metal reporter driving on a test track. Peak load on emission test is about 33bhp/ton. So the transition is whatever power is needed for 35-40bhp/ton. This results in a less responsive engine at the low load/speeds used for emissions test. Emissions /bhp are about 20x - 40x worse on high load map than on the low load map.

Reply to
Peter Hill

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