Testing: Other Fields & Data Fields.

Hello!
I've heard something that I actually find hard to believe...
Is it conceivable that a car of the current generation, primarily to reduce fuel consumption, might actually use different engine control parameters when it detects, through various sensors (e.g., ESP), that it is being "driven" on a dynamometer?

Sure, here's the translation:

"Thx."
Michael.

Hello!
I've heard something, and frankly, I find it hard to believe...
Is it conceivable that a car of the current generation, primarily to reduce fuel consumption, might actually use different engine control parameters when it detects, through various sensors (e.g., ESP), that it is being 'driven' on a dynamometer?

Sure, here's the translation:

'Thx.'
Michael

Yes. But that has been the case for a loooong time.

Unfortunately, I can only provide this from memory, without being able to cite specific sources.

In the early days of digital engine control systems, some manufacturers used test bench identification routines that would switch to specific "maps" with particularly good fuel efficiency and emission values. In normal road use, however, other settings, focused on performance and driving pleasure, were automatically engaged.
It was classified by the KBA(?) as a deliberate fake used for dynamometer tests and was then explicitly prohibited.

Currently, engines are also tuned to achieve low consumption and emission values within the speed and load ranges of the official test cycles, but (importantly!) if someone operates the engine within these parameters in normal road traffic, the engine runs with the same (performance-reducing) parameters as it does on the test bench.

Hi.

You mean, for example, the "bumps" that appear at the beginning of the injection process in a Golf 3 TDI engine.


m;

dieselmartin wrote:

For example, you're talking about the "humps" at the beginning of the injection of a Golf 3 TDI...

No, those are always there: in normal driving and on the test bench, because the MSA15 doesn't have explicit test cycle recognition.
The G3 was able to implement the fuel-saving ridges without exceeding the critical emission limits during the testing cycle.

Okay,

The humps cannot be recognized by a test bench, but they are specialized for it.


But the Münch Mammoth does things like that.
http://www.spiegel.de/spiegel/print/d-27497223.html

Quote:

"... while approaching at 50 km/h, the system anticipates the test situation and automatically reduces power."

m;