Toyota'supcomingSUVhybridversion.ThecompanyheldinDetroiton"2004NAIAS(Detroitmotorshow)"issuedalexusbrand"RX400h".RX400hcomparedwiththeoriginalhybrid,thenickelmetalhydriderechargeablebatterypoweraboutdoubled,themotorpowerisalsoimproved.However,thedetailshasnotbeenannounced.Firstofall,theendof2004willbeonsaleinAmericaandisreadytolaunchinJapanalmostsynchronization.
RX400h采用四轮驱动方式。前轮利用排量3.3L的V型6缸引擎和马达，后轮则只用马达驱动。总计最大功率为270马力。达到了与采用4缸引擎的小型轿车同等或以上的燃效。由镍氢充电电池升压后供给马达的电压据称比Prius最大的500V还高。另外，镍氢充电电池安装在后座下方。
TheRX400hwithfour-wheeldriveway.Frontwheelusingthedisplacementofthe3.3LVsix-cylinderengineandmotor,therearwheelmotordriveonly.Atotalmaximumpowerof270horsepower.Reachedwiththe4cylinderenginessmallcarsareequallyormorefuelefficiency.Bythenickelmetalhydriderechargeablebatterysupplyvoltageofthemotorafterboosterthanofthe500largestPriusvisstillhigh.Inaddition,belowthenickelmetalhydriderechargeablebatteriesinstalledinthebackseat.
Prius采用的引擎冷却水蓄热系统此次则没有采用。该系统通过将变温的冷却水蓄入真空绝热箱中，以备引擎重起时使用，达到了清洁尾气的效果。由于SUV尾气限制不像Prius等小型车那样严格，因此不需采用。
ThePriusUSEStheenginecoolingwaterheatstoragesystemsarenotused.Thesystemwithvariabletemperaturebycoolingwaterintothevacuumadiabaticstoragebox,forengineusedtoreboot,achievedtheeffectofcleanexhaustgas.BecausetheSUVexhaustlimitnotasstrictasthePriusandothersmallcars,sothereisnoneedtoadopt.
