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Torque Vectoring in XSE?

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#3 ·
Quickdtoo said:
DTV is standard on the Adventure/Trail and Limited, not an option on any other model/trim, AWD Rav4 HVs have an independent electric motor driven rear axle unit. The HV AWD system is called E-Four.

https://global.toyota/en/mobility/tnga/powertrain2018/4wd/
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It appears, from the video you linked on the "Some questions. . ." thread, that both systems try to achieve the same goal. The DTV does this by varying the torque on the two rear wheels, the E-Four by applying a brake to one of the wheels. Does this sound accurate? If so, does applying the brake to one of the rear wheels allow more torque from the remaining wheel?
 
#4 ·
bpedit said:
It appears, from the video you linked on the "Some questions. . ." thread, that both systems try to achieve the same goal. The DTV does this by varying the torque on the two rear wheels, the E-Four by applying a brake to one of the wheels. Does this sound accurate? If so, does applying the brake to one of the rear wheels allow more torque from the remaining wheel?
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It's just a brake activated limited slip, braking one wheel transfers all the torque to the opposite side through the open differential gears, in the Japanese video you'll see Auto LSD mentioned which is the same as the Trail Mode, all 4.4 and 4.5 FWD Rav4s have Auto LSD.

DTV is explained in the 3rd video.



 
#5 ·
I almost wish I hadn't watched the third video. Looks like the E-Four system is a pretty weak AWD setup. Do I need heavy duty AWD? Probably not. Would it be nice to know that it's more capable? Yes.

I'm going to try to drive one tomorrow. If I like everything else about the RAV4 then I will probably get one this time next year, in spite of the weak AWD.
 
#6 ·
wbw said:
I almost wish I hadn't watched the third video. Looks like the E-Four system is a pretty weak AWD setup . . ..
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Not what I saw. The coverage of the hybrid system, versus gas models, begins about 12:40 into the video, They complain about the 2018 implementation, that gets blamed on software, then they say the 2019 version is much better. I see nothing to fret about here.
 
#7 ·
wbw said:
I almost wish I hadn't watched the third video. Looks like the E-Four system is a pretty weak AWD setup. Do I need heavy duty AWD? Probably not. Would it be nice to know that it's more capable? Yes.

I'm going to try to drive one tomorrow. If I like everything else about the RAV4 then I will probably get one this time next year, in spite of the weak AWD.
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Did you watch it all the way through? Also, they show the prius with the updated software and it looks close to the subaru from the start off of ice, with both wheels providing power. I know the new Rav4 Hybrid AWD provides significantly more power to the back also. I believe previous generations could only provide something like 20% power and now its significantly higher.
 
#8 ·
wbw said:
I almost wish I hadn't watched the third video. Looks like the E-Four system is a pretty weak AWD setup. Do I need heavy duty AWD? Probably not. Would it be nice to know that it's more capable? Yes.

I'm going to try to drive one tomorrow. If I like everything else about the RAV4 then I will probably get one this time next year, in spite of the weak AWD.
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Here's a 2017 HV diagonal snow test, the '19 should be significantly better with the Trail mode feature and 30% more power to the rear drive. I couldn't find a decent '19 HV test other than driving around on snowy roads.

 
#9 ·
I guess I'm seeing the glass half empty. When talking about the third AWD set-up, which was the Hybrid AWD system, the narrator describes it as a 'mild AWD system'. Then at the end says that it 'engages only occasionally' and its 'capability is limited'. I guess I was hoping that it would be at least as good as the AWD in my Equinox which sends some power to the rear every time the car starts from a standstill. I found that very useful this past winter. But I don't believe that the Equinox has any type of torque vectoring. So maybe it's a wash.

Still planning to test a Hybrid tomorrow (if the car hasn't been sold by then). If I can get past the eCVT transmission I think I'll be OK with the RAV4 Hybrid. I'm really liking the XSE version in white or silver with the black top and black wheels. Very attractive in my opinion. My wife even likes it.
 
#11 ·
wbw said:
I guess I'm seeing the glass half empty. When talking about the third AWD set-up, which was the Hybrid AWD system, the narrator describes it as a 'mild AWD system'. Then at the end says that it 'engages only occasionally' and its 'capability is limited'. I guess I was hoping that it would be at least as good as the AWD in my Equinox which sends some power to the rear every time the car starts from a standstill. I found that very useful this past winter. But I don't believe that the Equinox has any type of torque vectoring. So maybe it's a wash.

Still planning to test a Hybrid tomorrow (if the car hasn't been sold by then). If I can get past the eCVT transmission I think I'll be OK with the RAV4 Hybrid. I'm really liking the XSE version in white or silver with the black top and black wheels. Very attractive in my opinion. My wife even likes it.
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It seems to me that their comments were based on their tests of the 2018 rav4 hybrid.

There's no doubt that AWD Rav4 Hybrids from 2017 and 2018 were lacking and significantly worse. The 2019 verison has fixed that through a combination of substantial software updates and a motor which directs more power to the rear wheels then was previously available. The video of the prius seems to indicate a pretty substantial awd system at least in the snow and indicates toyota specifically designed the system for snow/cold weather given the comment about batteries.

They discuss the changes Toyota has made to improve the system at 13:58 however they also neglect to mention the increased power to the rear drive train that the electric motor now provides.

See the link below which should cue up at 13:51.

https://youtu.be/rWxzkY8_D3g?t=831
 
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