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TDI (Diesel) Emissions This is a discussion about emissions from TDI's. Pro's cons of Diesels (including biodiesel) effects on the environment and how they compare to Gasoline and other fuel sources for Internal combustion engines.

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Old October 21st, 2019, 08:33   #151
kjclow
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Remember that one year an NAIAS where MB had that diesel hybrid E-class displayed? Wonder what became of that. Looked to be the OM651 engine coupled to a Bosch hybrid system. Probably pricey, but probably impressive fuel economy on both city and highway driving.
The original concept Atlas was also setup as a diesel hybrid.
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Old October 21st, 2019, 08:37   #152
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Discussing that in another thread, and it has been tried back in the '80s and early '90s. I think it is best suited for yard lot transfer trucks, as OTR trucks typically cruise at a higher speed and the modern transmissions they use (mostly automated manuals) are pretty efficient at keeping the engine in the sweet spot.
One of our trucking firms came and gave us a demo on chemical handling the other day but the questions turned to talking about the tractor. They're using all Freight Liners with automatics. Said it was like driving a laz-y-boy now. All the bells and whistles to keep them in the lane and adaptive cruise. Said that they can get up to 11 mpg fully loaded at highway cruising, which is governed at 68 mph.
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Old October 21st, 2019, 10:15   #153
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One of our trucking firms came and gave us a demo on chemical handling the other day but the questions turned to talking about the tractor. They're using all Freight Liners with automatics. Said it was like driving a laz-y-boy now. All the bells and whistles to keep them in the lane and adaptive cruise. Said that they can get up to 11 mpg fully loaded at highway cruising, which is governed at 68 mph.
There's a lot of light duty trucks that can't even do 11 MPG while towing within their much lesser capacity.

11 MPG out of a massive semi that can haul 80,000+ lbs is nuts.
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Old October 21st, 2019, 11:03   #154
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There have been a lot of good things to say about Daimler/Detroit's DT12 automated transmissions. I think that has a lot to do with improved fuel economy of the big Freightliners. Volvo's iShift has been pretty successful as well.
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Old October 21st, 2019, 15:00   #155
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I still think it would be great to have a diesel engine hybrid with a Chevy Volt-like propulsion system, perhaps with even smaller batteries than the Volt. The engine could run at peak efficiency and let the electric motors provide motive power.
Diesel engine + all of its associated emission control systems + hybrid system components = too much money.

Or, you recognise that since the way the vehicle drives no longer depends much on the shape of the torque curve ... you take the gasoline engine and fiddle with the cam timing to obtain Atkinson-cycle operation, which results in little low-end torque but it doesn't matter because the electric motor operates best there. See: Toyota Hybrid Synergy Drive.

There are limits to the concept of "run the engine at peak efficiency and let the electric motors provide motive power". The problem with that, is that the power available close to the engine's sweet spot of highest-efficiency operation rarely coincides with road load, with the result that the engine will always be charging or discharging the battery, so you get charge/discharge losses. That's why the Toyota Prius sends most of the engine torque through the mechanical torque path, and it varies engine output to match road load up to certain limits. That's why a Volt is capable of mechanically coupling the engine to the wheels, and it varies engine output to match road load up to certain limits.

It's worth operating the engine "off design" sacrificing a few points of efficiency if it allows NOT having the charge/discharge losses.

The way the Priuses and Volts and Ford hybrids all work when they are in combustion-engine mode, is that they try to operate the engine within its best-efficiency regime, matching road load, driving the wheels mechanically, whenever they can. If there is so little demand that engine efficiency would be poor, and the battery is sufficiently charged, they shut the engine down and operate electric-only. If the battery charge drops too low then they start the engine and run it under load to recharge it - the idea being that the total of the road load and the recharging load gets it back into its best-efficiency regime.

It is quite a sophisticated optimisation strategy ... But the driver still plays into it. I've had a Ford Fusion hybrid as a rental car, and the trick was to play along with the state of charge of the batteries, taking advantage of terrain where possible, the idea being to help it to run the engine as little as possible but IF it was running, keep it under load.
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Old October 21st, 2019, 19:31   #156
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11 MPG out of a massive semi that can haul 80,000+ lbs is nuts.
I haul a skid steer for work here and there, 26,000 pound combined vehicle weight, and that gets 9-10 MPG depending on terrain and speed.

11 MPG for a loaded semi is quite impressive!
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Old October 22nd, 2019, 07:28   #157
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Since EPA is in this thread, has anyone ever wondered why EPA does not mandate that cruisers that are lurking in speed traps, parked at traffic stops, guarding certain churches during days of worship, full time and attention in wrecks, TURN OFF THEIR ENGINES and not keep the engine on idle?
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Old October 22nd, 2019, 07:40   #158
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Since EPA is in this thread, has anyone ever wondered why EPA does not mandate that cruisers that are lurking in speed traps, parked at traffic stops, guarding certain churches during days of worship, full time and attention in wrecks, TURN OFF THEIR ENGINES and not keep the engine on idle?

Well you could expand that to include any and all gov't agencies. Does the Secret Service really need to use Suburbans with only four people in each on, or could they use a G-van with 10 people inside instead?

I mean that is a never ending hole right there.
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Old October 22nd, 2019, 08:45   #159
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Go to the White house. There are COUNTLESS Suburbans parked with motors running a trail of airconditioning condensate that goes to the drain.
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Old October 22nd, 2019, 14:52   #160
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Since EPA is in this thread, has anyone ever wondered why EPA does not mandate that cruisers that are lurking in speed traps, parked at traffic stops, guarding certain churches during days of worship, full time and attention in wrecks, TURN OFF THEIR ENGINES and not keep the engine on idle?
Fellow governmental agencies get a pass from regulations, duh

And then their gas engine suffers from a cracked exhaust manifold and the occupants suffer from CO poisoning... *cough*FORD EXPLORER*COUGH*

Of course, CO poisoning could be avoided... with a diesel :P
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Old October 22nd, 2019, 19:04   #161
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Fellow governmental agencies get a pass from regulations, duh
And then their gas engine suffers from a cracked exhaust manifold and the occupants suffer from CO poisoning... *cough*FORD EXPLORER*COUGH*
Of course, CO poisoning could be avoided... with a diesel :P
The "Beast" has a diesel.
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Old October 22nd, 2019, 22:00   #162
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Interesting. I'd love to know more about the power plant in the presidential limo. I'd guess it might be a tweaked Duramax. But maybe it's a pure mechanical injection setup to eliminate any kind of electronic interference?
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Old October 23rd, 2019, 04:35   #163
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That has been discussed before, and it has been published that it is a gasoline engine... however someone I know and trust has actually been present when it drove by and he swears it is a diesel.

It has been speculated that the current and previous versions rode on a GM Topkick (medium duty truck) chassis, with a Cadillac "skin" over it that appears to be a morphed enlarged version of some existing model, sort of like an Escalade sedan.

Standard engines in those trucks are the 8.1L Vortec V8 or the 6.6L Duramax V8. But who knows.
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Old October 23rd, 2019, 05:56   #164
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https://www.livetradingnews.com/fact...l#.XbA-ZG5FwYw

http://etcgreen.com/cadillac-one-pre...uns-biodiesel/

https://www.aallinlimo.com/blog/craz...idential-limo/
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Old October 23rd, 2019, 13:05   #165
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Interesting. I'd love to know more about the power plant in the presidential limo. I'd guess it might be a tweaked Duramax. But maybe it's a pure mechanical injection setup to eliminate any kind of electronic interference?
I remember when they did an update to 'The Beast' under Obama, I read that they were using the old GM 6.5L IDI turbo diesel...

Not a spectacularly powerful, efficient or clean engine, but being purely mechanical, it'll withstand an EMP blast and keep driving... So there's that.
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