Thursday, September 25, 2008

Features of Hybrid SUV Models

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.

 

Hybrid SUV Models

 

Toyota and Lexus are providers of hybrid SUVs. Honda provides the mild hybrids. These are the ones that rely mainly on the gas engine while using a small electric motor or generator to supplement it. Toyota Prius and Ford Escape Hybrid are examples of strong hybrids which have a larger role ascribed for the electric motor.

 

Features and Functionalities of Hybrid SUVs

 

The pathway of energy for the Hybrid SUVs can vary to wide extents. This depends upon various conditions and demands of the driver. Usually it is the electric motor that provides most of the momentum while driving at lower speeds despite the engine revving. The excessive power from the engine is absorbed by the smaller motor or generator and then routed back to the main motor to be used either for providing the energy to move the car or for charging the battery pack.

 

A simple system is involved in the Hybrid SUV setup. No rotating belt is there as in case of conventional Continuously Variable Transmission (CVT). There are simply two electric motors and a gas engine that is permanently linked together using a planetary gear set. The driver can perceive nothing but only a smooth flow of power in spite of the fact that there is a lot of variation in the different modes.

 

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.

 

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