HannahWCU Posted July 25, 2013 Report Share Posted July 25, 2013 WARNING: Very Technical Discussion Ahead! :gaah: Being an Engineer, I have long wondered exactly how the eCVT in the CMax works. I have read articles and seen diagrams, but until now, I have not been able to really understand how a single planetary gear set can output variable speeds from two input sources (electrical, motor and mechanical, engine). I know how a planetary gear works. But how this is applied in a Hybrid Drivetrain I could not figure out. Until I found this video. This video is how a Gen3 (and newer) Prius works, but I am sure the Cmax is similar. Its a long video (30 minutes) but very informative. I hope some of you find this as interesting as I did. zhackwyatt, Tdefny, slampro and 1 other 4 Quote Link to comment Share on other sites More sharing options...
Altazi Posted August 3, 2013 Report Share Posted August 3, 2013 Hello HannahWCU. I watched the video in its entirety. My wife remarked on its noted soporific effect. As an electronic engineer, I found it mostly interesting, but would have enjoyed a bit more description of how the planetary gears worked. Thank you for finding this, though. I do feel as if I know a bit more about how the hybrid transaxles work. Of course, I'd love to see exactly how the C-Max works, with C-Max components - and a more dynamic presenter ;) Quote Link to comment Share on other sites More sharing options...
jdbob Posted August 3, 2013 Report Share Posted August 3, 2013 I wish they had made one that just showed how the Gen 3 version works. The constant going back and forth between Gen 2 and Gen 3 really slowed things down. Quote Link to comment Share on other sites More sharing options...
rfruth Posted August 3, 2013 Report Share Posted August 3, 2013 Here (link) is some (not much) HF 35 info https://docs.google.com/file/d/0B_vJ6zqdx0EqRF92eDZVMEZ3ckE/edit?usp=sharing Quote Link to comment Share on other sites More sharing options...
HannahWCU Posted August 4, 2013 Author Report Share Posted August 4, 2013 I agree on wanting to see the CMax eCVT, but at least this gave me a basic understanding of the way an eCVT works. Quote Link to comment Share on other sites More sharing options...
plus 3 golfer Posted August 4, 2013 Report Share Posted August 4, 2013 The video is good (it's been posted several times before) but the Doc link shows a physical layout of the HF35 on Page 8 and as such it is much easier to see how things actually work. The video guy needs a layout such as slide 8 to augment his demonstration and then it would be a "great" video. I simply remember that sun gear is connected to generator (MG1); ICE is connected to planet carrier; the traction motor (MG2) is connected to the ring gear and final drive. Then, it's fairly easy to visualize what happens / needs to happen to start ICE, drive the car in full EV, drive in ICE only, charge the battery, or drive in split mode (both negative and positive), coast (with regen) and so forth. Quote Link to comment Share on other sites More sharing options...
bigalpha Posted August 5, 2013 Report Share Posted August 5, 2013 Here's a Prius transmission simulator I found not too long ago. I assume that this is similar to the CMax. http://eahart.com/prius/psd/ Quote Link to comment Share on other sites More sharing options...
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