| Intelligent 4WD System "E-4WD" |
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To maximize the cabin space of compact vehicles, Nissan has developed
a low emission 4WD system called "E-4WD."
The "E-4WD" is the offspring of Nissan hybrid technology
and is light and compact. It shifts the vehicle from 2WD to 4WD when
the need arises. The E-4WD consists of a motor and clutch, a rear
wheel drive unit of low gears, a generator for powering the motor
wheel drive, and a 4WD controller.
When the front-wheel slides, the 4WD controller signals the generator.
The electric power produced by the generator turns the motor, which
is positioned in the rear of a vehicle, and the power is transmitted
through the clutch to the rear wheels. Under ordinary operating conditions,
the rear wheel drive clutch (E-4WD) is not engaged, and the vehicle
operates in economical 2WD.
In addition, the motor is positioned in the back of the vehicle. This
means that a propeller shaft is unnecessary, and that unlike ordinary
4WD vehicles, there is no loss of indoor space.
The 4WD system can also be used to make lighter weight, which helps
to increase the fuel economy of the vehicle. Moreover, the vehicle
can go from 4WD to 2WD with the flip of a switch. A compact vehicle
called the "mm", which was exhibited at the 35th Tokyo Motor
Show in 2001, comes equipped with "E-4WD".
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