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Variants of Hybrid Synergy Drive

Discussion in 'Gen 2 Prius Technical Discussion' started by bredekamp, Mar 13, 2008.

  1. bredekamp

    bredekamp Member

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    Are the only differences between the HSD in the Highlander, Prius and Camry the ICE? I was just wondering if the larger engines in the other two also uses the Atkinson Cycle like in the Prius.

    With the Highlander, Camry and Lexus Hybrids being newer than the Prius, did Toyota make any improvements to the HSD like weight reduction or performance enhancement? I know the Lexus and highlander have an extra motor in the rear. Are the HV battery capacities the same amongst these vehicles? Do they essentially use the same NiMH pack as the Prius?

    So many questions....I can't even test drive one of Toyotas other hybrids cause they don't sell them here.
     
    #1 bredekamp, Mar 13, 2008
  2. efusco

    efusco Moderator Emeritus
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    The PSD has gotten smaller, the MGs on the Highlander are larger than on the Prius. The battery on the Highlander is larger...I think the one on the Camry is as well.

    The firmware is a bit different as well, but not much.
    So yes, they've incorporated some advancements into the newer HSD vehicles.
     
    #2 efusco, Mar 13, 2008
  3. bredekamp

    bredekamp Member

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    Are the batteries physically larger or did they just manage to up the kWh ratings somehow? Is there a website you can recommend with more technical details of how HSD evolved from the 1997 Prius through to now?

    If the battery in a Prius dies, can one use the pack from a highlander?
     
    #3 bredekamp, Mar 13, 2008
  4. efusco

    efusco Moderator Emeritus
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    Physically bigger...but I don't have a good source for you on hand.
     
    #4 efusco, Mar 13, 2008
  5. dogfriend

    dogfriend Human - Animal Hybrid

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    TOYOTA: Company > Technology

    Only covers the Prius though. I have seen some comparisons of Camry and Highlander HSD, but I can't remember the source right now. I do know that the Camry battery is higher voltage (245V) compared to the Prius (201V)
     
    #5 dogfriend, Mar 13, 2008
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    The Highlander Hybrid ICE uses Otto cycle. Not sure about CamHy.

    The Highlander Hybrid battery is rated at 288V nominal compared to the 2G Prius battery at 201.6V and the Classic Prius battery at 273.6V. The HiHy battery is arranged in three separate physical sections to fit under the second row seat.

    The batteries cannot be interchanged between the different vehicles. The modules have a different physical appearance, I recall that the HiHy has eight 1.2V cells in a module vs. Prius with six 1.2V cells in a module.

    All Toyota hybrid batteries are rated at 6.5AH, they are all the same for legal/licensing reasons. Since the HiHy battery produces more voltage (due to more modules in series) the available battery power is correspondingly greater.

    I had taken photos of the HiHy battery but can't find them right now... However, here's a link to my Yahoo Prius group photo album containing five battery photos (you probably need to join the group to gain access): http://autos.ph.groups.yahoo.com/group/Prius_Technical_Stuff/photos/browse/2a94

    Regarding a website for more info, I suggest the Toyota subscription website: techinfo.toyota.com and look for the New Car Features Manual for the 2001 Prius, the 2004 Prius, the 2006 HiHy, and the 2007 CamHy. It will cost US$50 for one-month access or US$10 for one-day access.

    Download and study the various files. (Being a US site, there's no info on the original Prius sold only in Japan.)
     
    #6 Patrick Wong, Mar 13, 2008
  7. usbseawolf2000

    usbseawolf2000 HSD PhD

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    #7 usbseawolf2000, Mar 13, 2008
  8. n8kwx

    n8kwx Member

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    Buyhevs, on the GreenHybrid Camry forum posted the following:

    My one paragraph summary:

    Toyota made significant improvements to the power density of the both the motors and the inverter. The Camry has more power than the Prius in a smaller space. The energy efficiency of both was also improved.

    Although not mentioned in the report, I'm sure cost was reduced as well.

    I can't wait to see what improvements are made for the upcoming "new" Prius!
     
    #8 n8kwx, Mar 13, 2008
  9. ken1784

    ken1784 SuperMID designer

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    Product Catalogues | Panasonic EV Energy Co., Ltd.

    The NiMH battery performance is increasing model by model.
    NHW-10 Prius(1997-2000): cylindrical, 240cells 6Ah poor performance
    NHW-11 Prius(2001-2003): p[SIZE=-1]lastic case prismatic[/SIZE], 228cells 6.5Ah medium performance
    NHW-20 Prius(2004-2008): p[SIZE=-1]lastic case prismatic[/SIZE], 168cells 6.5Ah better performance than before
    Highlander/RX400h:metal[SIZE=-1] case prismatic[/SIZE], 240cells 6.5Ah better performance than before
    Camry:metal[SIZE=-1] case prismatic[/SIZE], 204cells 6.5Ah
    GS450h/LS600h:metal[SIZE=-1] case prismatic[/SIZE], 240cells 6.5Ah

    The power and capacity become better to increase number of cells.

    Ken@Japan
     
    #9 ken1784, Mar 14, 2008
  10. Tideland Prius

    Tideland Prius Moderator of the North
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    L4 = inline 4...easier to read than I4

    Prius:
    - 201.6V battery
    - Max 500V
    - 1NZ 1.5 litre DOHC VVT-i L4 on Atkinson cycle
    - PSD

    Camry Hybrid:
    - battery is 288V (~ the same size as the Prius battery, maybe wider)
    - Inverter ups it to 650V
    - 2AZ 2.4 litre DOHC VVT-i L4 on Atkinson cycle
    - PSD w/ reduction gear

    HiHy:
    - battery is 288V (flattest battery. It lies under the rear 2nd row seat and has 3 separate cooling fans/loops)
    - Inverter steps it up to a max of 650V
    - 3MZ 3.3 litre DOHC V6 VVT-i on Otto cycle
    - CVT w/ reduction gear
    - 4WD models have a rear elec. motor


    As USBSeawolf said, check out HYBRID SYNERGY DRIVE for more details.
     
    #10 Tideland Prius, Mar 15, 2008
  11. dogfriend

    dogfriend Human - Animal Hybrid

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    I have a service manual page that indicates that the Camry battery is rated at 244.8 V. Also, in the ORNL report, they also have it at 244.8V.

    BTW, n8kwx, thanks for posting the ORNL report comparing the Camry and Prius. It was interesting.
     
    #11 dogfriend, Mar 15, 2008
  12. Tideland Prius

    Tideland Prius Moderator of the North
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    ohh? So it's lower than the Lexus models?? (and I think all Lexus models have the 288V one)
     
    #12 Tideland Prius, Mar 15, 2008
  13. dogfriend

    dogfriend Human - Animal Hybrid

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    Here is a manual page where they give the voltage. It appears in another location in that section also. I got the Camry manual page by mistake somehow.
     

    Attached Files:

    #13 dogfriend, Mar 15, 2008
  14. Tideland Prius

    Tideland Prius Moderator of the North
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    So there are 3 versions of the battery then. Interesting.... The Camry Hybrid is the latest one, why would it be 244.8V? To save space? Maybe that's why it's shallow enough to allow a pass-through.
     
    #14 Tideland Prius, Mar 15, 2008
  15. ken1784

    ken1784 SuperMID designer

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    Just a right amount battery for a right size of vehicle

    Ken@Japan
     
    #15 ken1784, Mar 15, 2008
  16. dogfriend

    dogfriend Human - Animal Hybrid

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    I believe they are limited to a certain Amp*hr rating because of their licensing agreement. So they change Voltage to get the Power rating they want.
     
    #16 dogfriend, Mar 15, 2008
  17. Tideland Prius

    Tideland Prius Moderator of the North
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    Ken: yep!

    dogfriend: licensing with Panasonic?
     
    #17 Tideland Prius, Mar 15, 2008
  18. dogfriend

    dogfriend Human - Animal Hybrid

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    Panasonic licenses from Cobasys.
     
    #18 dogfriend, Mar 15, 2008
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