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Hybrid Vehicles Hybrid Vehicles - Archived Discussions Hybrid Diesels? 
395 messages, Last post on Aug 29, 2007 at 7:27 AM
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A diesel engine ususlly performs very well in highway driving (constant RPM), whereas the electric hybrid solution helps in stop and go driving. These two could complement each other very nicely.
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Replying to: amazon (Jul 08, 2004 7:11 am) So can a gas engine with different(Atkinson) cycle. Diesel engines are heavier and more expensive than gas engines. Stop/restart of diesel engine during stop-and-idle-and-go traffic would be difficult due to the heavy engine and the lack of spark plug. For those reasons, Atkinson cycle gas engine makes more economical and engineering sense. Diesel would be a very good choice thought, just not the best choice. Dennis
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Replying to: usbseawolf2000 (Jul 08, 2004 7:44 am)
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Replying to: amazon (Jul 08, 2004 8:51 am) The main difference between "regular" Otto cycle and Atkinson cycle is difference in timing of closing intake and exhaust valves. Pretty much like VVT-i or VTEC. Prius has been on the road for 7 years, since 1997. It is a Toyota and even Lexus is going to use it. By looking at reliability records of both companies, I wouldn't say the cars that they build are not "tried and true". Dennis |
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Replying to: amazon (Jul 08, 2004 8:51 am)
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Replying to: zodiac2004 (Jul 08, 2004 12:11 pm) The way PSD is set up, as long as Atkinson cycle ICE is moving, electricity is being generated. The battery isn't necessary for spark plug to ignite. "And there is very little to be gained by stopping and starting the diesel" Yup, that's why diesel and electric hybrid have overlapping benefits but both increase price. That's when "price for benefits" comes into question. Dennis |
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Replying to: zodiac2004 (Jul 08, 2004 12:11 pm) I've heard that LAME argument many times now. It has no basis in reality, since there is no data to support it. The data actually shows that diesel engines suffer in low-idle conditions (like everyday commute traffic)... compared to not running a gas engine at all, like what Prius does. JOHN
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Replying to: john1701a (Jul 11, 2004 4:11 am)
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Replying to: gagrice (Jul 11, 2004 7:32 am) JOHN |
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Replying to: john1701a (Jul 11, 2004 4:11 am) I've heard that LAME argument many times now. It has no basis in reality, since there is no data to support it. Huh? What's lame about it? A diesel uses very little fuel when idling, that's a fact. Would it be worth implementing features that turn the diesel engine off? Maybe, maybe not that would have to be determined. I actually did some testing yesterday with my VAGCOM software. I logged and monitored rpms, speed, throttle demand, and fuel qty. I haven't had a chance to really look at the data yet, but I'm trying to compare speeds vs fuel burn to see if there's a sweat spot in the TDI. (is 75mph vs 80mph exponentially worse than 70mph vs 75mph, etc). At idle here are fuel burn levels: Idling in neutral no accessories: .5 L/hour (.1321 gallons/hour) Idling in neutral with A/C: .9 L/hour (.2378 gallons/hour) I basically can idle with the A/C running for over 60 hours on a full tank of fuel.
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