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Hybrid Vehicles Lexus RX 400h Lexus RX 400h
2334 messages, Last post on Oct 11, 2009 at 10:42 AM
You are in the Lexus RX 400h Forum. Your Host is pf_flyer
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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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So I am looking to buy a SUV and have narrowed my choices to BMW X5 4.4i and Lexus RX 400h. Both these are quite similarly priced (X5 a little higher). The factors that are important to me are (in no particular order): luxury, performance, reliability and depreciation. Based on my test drive and research that I have done, here's what I have concluded (very simply put): 1. Luxury: Both are good 2. Performance: X5 4.4i has an edge 3. Reliability: Rx 400h wins (based on Lexus's reputation) 4. Depreciation: Not sure here about RX 400h? Lexus RX 330 retains it value quite well, so one can say that so should 400h. But my concern is that Lexus is overpricing 400h because of very limited supply and more demand (simple economics). I will also have to pay MSRP (I am in the Seattle area), though if I wait till next year I may be able to get some tax credit. I am not trying to do the fuel math and I don't care much about that (and you typically lose that anyway), but I believe that RX 400h should be priced higher than a similarly equipped RX 300 just because it has more power (similar to why V8 is priced more than V6). But consider the situation 5 years from now when there is no shortage of hybrid vehicles and there are lot more hybrid models from Lexus & other manufactures. Will the value of 2005 Lexus 400h drop considerably? Why does Edmunds (based on their TMV) think the Lexus will depreciate approx $10,000 in the first year (considerably higher than other SUVs like X5, RX 330)? Did anyone conduct such analysis before deciding to purchase (or not) Rx400h and what did you conclude?
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