Brit Hybrid

xoxoxoBruce · 02-28-2018, 10:31 PM

Way back when...

Carruthers · 03-01-2018, 01:21 PM

I've never understood the advantages of a diesel/petrol engine which powers a generator to propel a vehicle.
Logic dictates that by adding the intermediary electrical generator efficiency is degraded.
Seeking enlightenment I stumbled upon this site:

HOW DOES DIESEL-ELECTRIC SAVE FUEL?

In all honesty, whilst I am better informed, I am none the wiser.

xoxoxoBruce · 03-01-2018, 02:05 PM

Since torque is necessary to get the mass in motion and electric motors develop maximum torque at zero rpm, you can get away with small motors on two or four wheels.
The diesel or petrol engine can be very small and still power a generator big enough to supply power. Plus the engine will be designed and tuned to run at a specified constant rpm for maximum efficiency. With an engine accelerating and decelerating both waste fuel, and can't run below a stoichiometric fuel ratio of 14.7:1 safely. But running at a constant speed/load it can be a little leaner.

Happy Monkey · 03-01-2018, 02:02 PM

The article is about boats; I'm mainly thinking about cars:

For one thing, the diesel engine is not directly hooked up to the wheels, so at least one part of the question really is whether all of the components between the diesel motor and the wheels are more or less efficient than the equivalent for the electric motor. Every moving piece is lost power, and an electric motor doesn't need a transmission. This is before all of the complicated analysis in the article, which, if I got the gist correctly, is primarily concerned with the decoupling of engine/generator speed and motor speed, allowing the generator to operate at ideal RPMs for efficiency, while supporting a range of speed/power combinations on the motor.

Add a battery, and you can save the energy that a diesel engine otherwise would lose when idling. Add regenerative brakes, and you can also save the energy otherwise lost in heat and brake pad degradation.

Gravdigr · 03-02-2018, 01:43 PM

Two commu--two commutators?!?!?!?!?!?! Name: willy_nilly.gif
Views: 383
Size: 1.8 KB

BigV · 03-05-2018, 10:21 PM

Quote:

Originally Posted by Gravdigr

Two commu--two commutators?!?!?!?!?!?!Attachment 63325

shhhh

don't raise your voice, we don't want to alarm mr quirk

02-28-2018, 10:31 PM	#1
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	Brit Hybrid Way back when... Attached Images __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

03-01-2018, 01:21 PM	#2
Carruthers Junior Master Dwellar Join Date: Dec 2009 Location: Buckinghamshire UK Posts: 4,059	I've never understood the advantages of a diesel/petrol engine which powers a generator to propel a vehicle. Logic dictates that by adding the intermediary electrical generator efficiency is degraded. Seeking enlightenment I stumbled upon this site: HOW DOES DIESEL-ELECTRIC SAVE FUEL? In all honesty, whilst I am better informed, I am none the wiser. __________________

03-01-2018, 02:05 PM	#3
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	Since torque is necessary to get the mass in motion and electric motors develop maximum torque at zero rpm, you can get away with small motors on two or four wheels. The diesel or petrol engine can be very small and still power a generator big enough to supply power. Plus the engine will be designed and tuned to run at a specified constant rpm for maximum efficiency. With an engine accelerating and decelerating both waste fuel, and can't run below a stoichiometric fuel ratio of 14.7:1 safely. But running at a constant speed/load it can be a little leaner. __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

03-01-2018, 02:02 PM	#4
Happy Monkey I think this line's mostly filler. Join Date: Jan 2003 Location: DC Posts: 13,575	The article is about boats; I'm mainly thinking about cars: For one thing, the diesel engine is not directly hooked up to the wheels, so at least one part of the question really is whether all of the components between the diesel motor and the wheels are more or less efficient than the equivalent for the electric motor. Every moving piece is lost power, and an electric motor doesn't need a transmission. This is before all of the complicated analysis in the article, which, if I got the gist correctly, is primarily concerned with the decoupling of engine/generator speed and motor speed, allowing the generator to operate at ideal RPMs for efficiency, while supporting a range of speed/power combinations on the motor. Add a battery, and you can save the energy that a diesel engine otherwise would lose when idling. Add regenerative brakes, and you can also save the energy otherwise lost in heat and brake pad degradation. __________________ _________________ \|...............\| We live in the nick of times. \| Len 17, Wid 3 \| \|_______________\| [pics]

03-02-2018, 01:43 PM	#5
Gravdigr The Un-Tuckian Join Date: Apr 2007 Location: South Central...KY that is Posts: 39,517	Two commu--two commutators?!?!?!?!?!?! __________________ These statements have not been evaluated by the FDA, EPA, FBI, DEA, CDC, or FDIC. These statements are not intended to diagnose, cause, treat, cure, or prevent any disease. If you feel you have been harmed/offended by, or, disagree with any of the above statements or images, please feel free to fuck right off.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode