Pre-Heating the cat?!
I saw this article today...
https://arstechnica.com/cars/2018/05...id-sports-car/ And it says... Quote:
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It isn't a new idea. In fact, it has been produced commercially more than 20 years ago:
Continental Emitec GmbH http://www.emitec.com/fileadmin/_pro...03b71c7cb9.png Even so, there's a bunch of recent patents: https://scholar.google.nl/scholar?q=...=1&oi=scholart One relatively readable scientific publication: https://pure.tue.nl/ws/files/3268429/Metis237278.pdf Then there is... https://www.dehuishoudcoach.nl/wp-co...choonmaken.jpg Couldn't resist :D |
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I don't see the major fuel economy gains, though, unless it is just by getting into closed loop sooner. |
And this looks like a pretty cool set of developments (also a nice abstract of parts of the history):
http://www.emitec.com/fileadmin/user...d_catalyst.pdf |
Just don't put it in the microwave, mmkay?
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Here are the things the stock tune on my Subaru does to (presumably) heat the cat faster: - Idles in stratified fueling mode up to coolant temps of 60C (increasing fuel use by at least 50% at idle) - Retards ignition timing for the first 3 minutes after engine start. - Retards exhaust cam timing by 20 to 50 degrees until the coolant temperature is above 50C. - 1800rpm idle speed up to coolant temps of 40C, and even for a while after hot starts. I've pretty much tuned all these things out, with great benefits to short-trip fuel economy. They don't affect driveability. I can only assume the engine is tuned like this to heat up the cat quickly for regulatory reasons. I'd be surprised if overall NOx emissions were even reduced much. |
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Presumably it's meant with emissions compliance as a higher priority than overall efficiency. But anyway, depending on what kind of heater core it may use, it would eventually be more efficient than other approaches to increase the EGT right after the engine start.
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Would thermally insulating the exhaust manifold pipes and cat be at all beneficial?
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