Feb 24 2012, 03:10 PM
QUOTE(eltaria @ Feb 23 2012, 05:45 PM)
Actually, wanted to discuss this with u all.
In our and Prius's case, we convert mainly petrol > battery, while some is saved from regen braking. From personal driving, I'll say maybe 20% of the battery's power came from regen/braking.. (I consider myself a pretty good hypermiller, avg 19.5km/l for 80% city, 20% hw)
My question is, as physics says... During conversion of energy from 1 source to another, definitely energy loss will happen.
+ We're carrying the extra weight of the battery and the IMA system itself.
+Prius, even worse, carrying two full set of engine and transmission thingy and battery.
By this logic,
Wouldn't it be more efficient if we just have a 1.5L ICE in Insight with start stop tech, which i believe is the main contributor to our FC? (The new civic non hybrid have an eco save version with autostop feature too and their FC is similar to ours~!)
In terms of converting the energy to electric (energy loss), storing it(energy loss), using that energy(energy loss) and convert it via the electric motor.. + the added weight of batteries, I guess we're really in a small sweet spot that makes it all worth while in the end.
Now, going into the petrol>battery deeper, wanted to ask if there's RPM ranges during the ICE combustion where it's actually more energy effficient to convert and store into battery vs, burning the ICE 100%?
For example, if I drive at 40km steady, u will notice it'll charge battery, and after charge a few seconds, it'll go into EV mode, then depleted, then charge, then EV mode again, etc for infinity..
Apparently, overall this operating mode is more fuel saving in the end, despite, the initial assumption that converting energy from one form to another will result in net loss?
Anyone else finds this interesting on how the engine works, and why it's possible to convert and still net gain in the end?
*My unscientific guess is, at certain RPMs/Speed, the energy gained from burning ICE and the conversion ratio of that energy into actual speed is not efficient and results in huge losses*
And, during this highly energy>speed 'defficient' speed/rpm range, it's actually more profitable to convert the energy to electric save it and use it later on....
The petrol engine is not running purposely to charge the battery. In our and Prius's case, we convert mainly petrol > battery, while some is saved from regen braking. From personal driving, I'll say maybe 20% of the battery's power came from regen/braking.. (I consider myself a pretty good hypermiller, avg 19.5km/l for 80% city, 20% hw)
My question is, as physics says... During conversion of energy from 1 source to another, definitely energy loss will happen.
+ We're carrying the extra weight of the battery and the IMA system itself.
+Prius, even worse, carrying two full set of engine and transmission thingy and battery.
By this logic,
Wouldn't it be more efficient if we just have a 1.5L ICE in Insight with start stop tech, which i believe is the main contributor to our FC? (The new civic non hybrid have an eco save version with autostop feature too and their FC is similar to ours~!)
In terms of converting the energy to electric (energy loss), storing it(energy loss), using that energy(energy loss) and convert it via the electric motor.. + the added weight of batteries, I guess we're really in a small sweet spot that makes it all worth while in the end.
Now, going into the petrol>battery deeper, wanted to ask if there's RPM ranges during the ICE combustion where it's actually more energy effficient to convert and store into battery vs, burning the ICE 100%?
For example, if I drive at 40km steady, u will notice it'll charge battery, and after charge a few seconds, it'll go into EV mode, then depleted, then charge, then EV mode again, etc for infinity..
Apparently, overall this operating mode is more fuel saving in the end, despite, the initial assumption that converting energy from one form to another will result in net loss?
Anyone else finds this interesting on how the engine works, and why it's possible to convert and still net gain in the end?
*My unscientific guess is, at certain RPMs/Speed, the energy gained from burning ICE and the conversion ratio of that energy into actual speed is not efficient and results in huge losses*
And, during this highly energy>speed 'defficient' speed/rpm range, it's actually more profitable to convert the energy to electric save it and use it later on....
Get the idea wrong already.
It is about utilising unused/waste engine power to charge the battery, especially driving slow and idle time, whereby engine still running non-stop (which is wasted in ordinary car).
Hybrid is about saving those energy and store in battery, even though there is wastage in term of power conversion, it is miles better than total loss in ordinary car.
That's if driving in power mode, and speeding at high rpm, the hyrbid car may be performing (in term of FC) as same as ordinary car.
It is about saving energy that here and there (idle, regen braking, under utilise the engine time), that give you the better FC.
Quote
0.0445sec
1.55
7 queries
GZIP Disabled