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Hybrid Vehicles Lexus RX 400h Lexus RX 400h
2334 messages, Last post on Oct 11, 2009 at 10:42 AM
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The maximum output from the hybrid battery is stated (by Lexus) as being 45KW. The front A/C motor is capable of 167HP, 123KW, and the rear 68HP, 50KW. The total, net, for the ICE & electrics is stated as only 268HP. Why would they put a 167HP(123KW) AC motor in the RX400h if the most it can ever produce is ~60HP(45KW)? Is there a reasonable/logical explanation?
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Replying to: wwest (Oct 12, 2005 3:45 pm)
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Replying to: rx400hfan (Oct 13, 2005 5:10 am)
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Replying to: wwest (Oct 13, 2005 9:09 am)
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Lexus states that the TOTAL, net HP is 268..... That's basically 208 from the ICE and 60 (45KW) from the "hybrid" aspect. Is it possible that Lexus initially planned to have a ~140KW hybrid battery set and then things went awry for some reason before it entered production? That would also account for the "400" in RX400h. 208HP ICE, 192HP (140KW) electrics. And remember, keep in mind, the city/hwy MPG being reported by owners is completely out of whack, opposite, with the EPA estimates and what is being reported for the Prius. Would a more robust battery pack had produced a more appropreate city MPG?
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Replying to: wwest (Oct 13, 2005 12:27 pm)
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When I am WOT and the ICE is producing 208HP are you saying half of that drives the generator and then from the generator that half drives MG2... CVT.... If I jack up the rear end of a RWD vehicle with just a simple open diff'l, put it gear with the engine running and hold one wheel stationary with just my little pinky... If you think of the opposite wheel, now spinning rapidly, as MG1, that's the way I thought the CVT in the Prius, RXh and HH worked. Virtually no energy needed at MG1 to prevent the ICE from conveying energy to the roadbed via the opposite end of the diff'l if you want to remain stopped. So how do I overcome the "traction" force of my pinky?? I stop allowing MG1 to "freewheel", in other words I supply it with enough energy to turn it AGAINST the motive force of the engine. Remember that MG1 has a serious mechanical advantage over the ICE via the planetary gearset, so it doesn't take much energy, relatively. I assume the above moves the vehicle in reverse and if I apply AC power to MG1 to AID in supplying motive force the vehicle goes forward. But yes, assuming I am not requiring WOT performance, the ICE torque can be used to to recharge the batteries.
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Replying to: rx400hfan (Oct 13, 2005 1:23 pm) Are you confusing "low speed" with constant speed? At a constant speed, even uphill or towing, very little of the ICE capability is required for forward motion, So clearly, it can then be used to recharge the batteries. But if I am accelerating rapidly.... |
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Replying to: wwest (Oct 13, 2005 2:09 pm) You are correct that MG1 will be freewheeling when the ICE is running and the Lexus is stationary, but when you push the accelerator MG1 does not hold back by taking power from the battery it holds back by being a generator and providing the generated power to MG2. Due to the laws of physics while the vehicle is still stationary 100% of the power output of the engine (less slight gear losses) will be through MG1 acting as a generator. This power is directed into MG2 in addition to the battery power. As the vehicle speed increases more and more of the ICE power goes directly to the wheels via the ring gear of the PSD. Since the ring gear of the PSD and MG2 are tied directly together and then to the drive axle their speed is directly tied to vehicle speed. At the point where ICE rpm = MG2 RPM 28% of the power from the ICE will be generating electric through MG1 and 72% will be applied to the drive train. |
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