TORO can respond sensitively to its environment
It began in the summer of 2009, with two legs and a camera mounted on top – but it was still far from being a robot of humanoid appearance. Gradually, the TOrque controlled humanoid RObot (TORO), the German Aerospace Center‘s (Deutsches Zentrum für Luft- und Raumfahrt; DLR) walking machine, has become more human-like – an upper body, a head with camera eyes and arms have been added. TORO is now complete, with forearms and hands with sensors and flexible joints that allow it to respond to its environment with exceptional sensitivity. TORO must now learn, step by step, how to perform simple human actions – climbing stairs or opening doors, for example. “Now that the robotic body is complete, we can test processes where the robot carries out sequences of movements with foresight and fluency,” explains Project Manager Christian Ott.
Walking with sentience
Being a walking machine, there is one thing that TORO can, of course, do well – walk. The robot smoothly sets one foot down after the other and moves forwards in small steps. Although the speed is not great, with every step TORO detects the forces at work via sensors in its feet. Torque sensors in the joints ensure that the robot reacts flexibly to its environment. When the walking machine is standing still, it can compensate for impacts against its legs. TORO even manages to do this on a tilt board. “We are working on making it function even better when walking,” says Ott. TORO does this with remarkably small feet. This is a difficult obstacle that the scientists have chosen for themselves. “On the one hand, we wanted to make it more difficult by using a small footprint, but on the other, it enables the robot to climb over obstacles more easily.” The inclusion of an upper body and arms has added another challenge.
Experimenting on two legs
For the researchers, the walking machine is not merely a robot that is expected to learn and master specific tasks; it is a testing ground for all the technology required. While other robots are primarily expected to move around a known environment in a programmed way, researchers want TORO to develop other talents. Above all, they expect to prove its ability to operate independently, flexibly and safely in a new, unknown environment. To do this, the researchers at the DLR Institute of Robotics and Mechatronics are drawing on knowledge they already have; TORO’s arms and legs are based on DLR’s lightweight robots, which are already being used in car manufacturing. These, too, are fitted with sensors and react flexibly to any external disturbances. The researchers chose particularly powerful motors for the walking machine’s legs. The motors for the arms needed to be somewhat less powerful. In terms of TORO’s appearance, this means powerful legs and thinner arms.
With its arms and hands, TORO will now move on to the next phase of development, in which the interaction with the environment will be even greater.
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