Stepping on the brakes. Hitting the accelerator. Turning the steering wheel.
Motorists of the future will have little tolerance for such old-fashioned ways of operating their cars thanks to the emerging drive-by-wire technology.
In most cars, it takes an assortment of cables, fluids and mechanical components to translate what the driver does into what the car does.
Drive-by-wire, already used
widely in planes, where it
is known as fly-by-wire, and where cost of maintenance is
not an issue,
means employing electronics, rather than
mechanical and hydraulic systems, to operate
a vehicle:
Steering columns and brake lines
give way to sensors and actuators. Steering wheels can be replaced with joysticks
or driver control
units and human-machine interfaces.
Companies are now placing drive-by-wire
technology in several prototype
vehicles, including General Motors Corps
fuel-cell-powered
Hy-Wire, and the Novanta, a Saab-based
concept developed with Italian design house
Bertone.
Novanta has no accelerator or
brake pedals -- only a mechanism called a human-machine interface that looks
like a cross between an
aeroplane steering wheel and the handlebars
of a motorbike. Rotate the handles back and forth
to throttle the car up or down; squeeze
them to brake, turn them side-to-side
to steer.
The system uses sensors to read
the driver's actions and transfer the information to controllers called smart
electro-mechanical actuators.
The actuators convert electrical energy
into force to perform vehicle functions.
When the driver attempts to
turn the car, for example, sensors,
rather than a steering column, send
that information to the steering rack
to turn the wheels.
In addition to the technologies
found in Novanta, there will
be by-wire systems to handle emergency brakes
and clutches.
Eventually, it hopes to develop suspension-by-wire
to improve vehicle ride and handling.
Drive-by-wire systems are supposed
to help fuel economy because
they reduce losses in engine power caused
by the continuous
running of systems like power-steering
pumps.
In addition, they liberate car
designers, even the worst ones, by removing bulky devices and theoretically
allowing the controls for
steering, braking and other functions
to be placed just about anywhere in the vehicle.
A brake-by-wire system literally
cuts the cable from the brake
pedal to the brakes, gets rid of fluid, fluid
lines ... now they can position
the brake pedal anywhere they want.
Driver controls on the Novanta
fold into the driver-side door
when not in use.
The control unit on Hy-Wire slides from
one side of the vehicle to the other, allowing
the car to be driven from the driver or
passenger seat.
With their futuristic, gee-whiz
designs, drive-by-wire concept
cars like Hy-Wire and Novanta are a guaranteed
hit at auto shows.
But the by-wire vehicles that will first
hit the streets will look and feel a lot more
like the vehicles we drive today.
It's just a way of introducing
people to the technology. People
are accustomed to interacting with their
vehicles in a certain fashion,
especially older drivers, that's why
the keyless car still has keys.
In some cases, engineers working
on drive-by-wire vehicles are
even using force-feedback technology, similar
to what is available in
some video game controllers, to mimic
the mechanical feel of a vehicle, such as the
vibration drivers feel when revving up a car.
We feel through our hands what's
happening, and that helps us
understand what's going on with the vehicle
and that helps us control it,
eventually, when the Nintendo generation
is running the world (yech!), maybe you don't
need that kind of thing at that point.
You may not realize it, but many
drivers have already experienced a version of drive-by-wire: electronic throttle
control.
That commonly used technology eliminates
the cable that traditionally connected the
accelerator pedal to the throttle, which is the valve
that regulates air and fuel flow.
Also, some high-end vehicles
have by-wire parking brakes that
automatically lock when the vehicle is
parked and release when
driving resumes.
Full drive-by-wire systems that
include electronic steering may be about a decade away (thank heaven).
One barrier to wider use of drive-by-wire is the limited electric power available in most cars, usually 12 volts.
Hybrid vehicles, which can generate
their own electricity, are therefore a perfect application for drive-by-wire
and the perfect reason
for us vintage car enthusiasts to be hanging
onto our cars for as long as possible..........