The hybrid sports utility vehicles (SUVs) are high performance vehicles that are compatible to using two distinct sources of power- the gasoline engine and the electric motor. This provides a fuel efficient source of power.
The ‘milder’ hybrids are dependent primarily on the gas engine. They use a small electric motor/ generator to supplement this. There are also ‘strong’ hybrids in which the electric motor is given a larger role enabling it to propel the car on its own at low speeds.
There is a third electric motor or generator in case of the RX400h and Highlander Hybrid 4WD-i – two models of Hybrid SUVs. It is worth noting that the front-wheel-drive Highlanders do not have this motor. These Hybrid SUV models have none of the typical elements present in an all-wheel-drive system, namely, individual drive shafts connecting the front and rear axles and a center differential varying the power split. The independent third electric motor or generator rated for 68 hp and 96 lb-ft of torque is instead built into a rear transaxle. It is only in times of need like during hard acceleration or starting on a slippery surface that the rear electric motor comes into play. While moving under force of gravity (coasting) and braking, this rear electric motor acts as a generator. In other circumstances the two models work as front drive SUVs.
