Toyota Unveils Fuel-saving Technologies for New Prius

DENSO Develops Products Used in Toyota's New Prius

 

Or at least some parts of it are, enabling Toyota to make other improvements with no significant increase in overall weight

 

The fourth gen is heavier. Based on the released media files posted on this forum. Not a lot, as I recall in the 100 lb range or a bit less. Do note, contrary to some complainers, Toyota claims it is "faster" in acceleration. Graphs have been posted.

Yes, "B" relies on "pumping losses". But it also includes friction. Reduce that friction and you reduce some drag. Reduce aero losses with lower Cd and smaller or similar frontal area and you reduce drag.

So I ask again, will the fourth gen take off even more than the GII and GIII descending a mountain pass?

 

i heard 10 lbs.

 

mr bill says it doesn't rely on friction. how can we find the truth?

 

pretty cool beans

 

that is a remarkable achievement.

 

the two tone airflow?

 

Since you asked again, though I'm not sure that you were asking me, here are my two cents worth.

In measuring forces that induce slowing of a mass in motion, all forces are cumulative and must be considered in sum and in total. In the case of braking forces for the Prius, these forces, of course, include the effects of aerodynamic drag, rolling resistances, and mechanical forces, both induced (as with pumping losses) and parasitic (as in engine and drivetrain friction). Any and all of these forces can be measured individually, and added cumulatively.

As expected, some of these forces are larger than others. The larger the force, the larger the effect will be on acceleration (deceleration), where acceleration equals force x time.

In comparing the deceleration forces between say a GEN 3 and a GEN 4 prius, we are actually considering the change in the force (delta f) between the two models. As for aerodynamic drag, considering the change of 0.01 in the coefficient of drag (delta cD), the resultant change in force would hardly be significant - I presume it to be hardly measurable.

Similarly, the delta f in engine friction and in rolling resistance is uniquely small, possibly comparable to each other, but still a tiny fraction of the designed function of engine braking utilizing pumping losses.

Coming from me, this is not an exact science, and I have not consulted exact values for the forces, or the change in forces involved; it is more of an exercise in thought. It is intuitive by nature, however, that the braking force derived from the designed pumping losses of the ICE far, far outweigh the combined forces of all of the other mentioned forces combined. In other words, the change in forces of aero, rolling, and friction losses would be nearly if not completely insignificant.

So, to answer your question: Yes, the fourth gen Prius will take off even more than the GII and GIII descending a mountain pass, a little bit (all else being equal), but not much.

 

i qualify for the possibility.

 

idk, but i've never noticed it. is it in the manual, or tech papers?

 

Maybe in G4 they will make it more noticeable.

 

yes, perhaps it's a 30% improvement over the old system. double suction blower structure?

 

Well if it is,it doesn't work !
At least not for me .
It takes way too long for the windshield to clear up,I hope they improved that on gen. 4 !

 

when i put mine on floor/defrost, i think the a/c comes on. there's a difference between fog and ice.

 

David,

Toyota never claimed it has better acceleration times, but rather acceleration curves has been modified to make it smoother (it is more gradual now), and make it feel better relative to accelerator position (basically, response tuning).

So, don't raise hopes up!

Thx