While both Tesla and Google
are among the big names working on self-driving vehicles, NASA has its
own take on an autonomous vehicle that can perform a few
out-of-this-world maneuvers, perhaps because the technology behind it is
borrowed from concepts for astronaut rovers designed for eventual use
on the moon or Mars.
The bureaucratically-named "Modular Robotic Vehicle" is described by
NASA's Game Changing Development Program Office (yes, that's a real
office) as "a fully electric vehicle well-suited for busy urban
environments." But really, the MRV is much more than that. This is
thanks largely to its adapted fly-by-wire driving system and four
independent wheels called "e-corners" that allow the MRV to drift like a
beauty, drive sideways and rotate with a perfect turn radius of zero
degrees.
Motors capable of delivering 190 lb ft (258 Nm) of torque are located
in each wheel, and controlled with a traditional-looking steering wheel
and accelerator/brake pedal setup. There's also an available multi-axis
joystick that can be used in more advanced driving modes.
Because the MRV has no mechanical linkages to the steering wheel,
relying instead on a computer and sensor system interpreting driver
input and relaying it to the wheel motors over wires, it's also a great
candidate for remote or autonomous operation. The downside of the
fly-by-wire approach is that failures could lead to a catastrophic loss
of steering and control, so the entire architecture is redundant with
back-up motors and computers. To make the vehicle feel more like a
traditional car, the MRV has a force feedback system that sends
vibrations and resistance to the steering wheel.
"It’s like driving on ice but having complete control," says NASA's
Justin Ridley. "It’s a blast to ride in and even more fun to drive.
We’ve talked about it being like an amusement park ride."
NASA states that the technologies that went into the MRV are likely to play a role in the continuing development of lunar and Mars rovers, as well as future automobile design here on Earth.
Source: NASA
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