Auxiliary drive device for a wheelchair

An auxiliary drive device for a wheelchair, comprising:

• at least one electrically driven drive wheel;
• an electronic control unit for controlling functions of the auxiliary drive device;
• a coupling mechanism for coupling the auxiliary drive device to a wheelchair;
• and
• an operating satellite for driving the auxiliary drive device and for controlling functions of the auxiliary drive device, the operating satellite being adapted to be attached to the wheelchair and to be operated by a user of the wheelchair and comprising:
• a push control knob and a rotational control ring,
• wherein the push control knob is arranged within an outer circumference of the rotational control ring,
• wherein the rotational control ring is designed such that when it is turned in a first direction in a first operational condition in which the at least one electrically driven drive wheel is standing still, the at least one electrically driven drive wheel is driven and controlled such that a torque is delivered to the at least one electrically driven drive wheel so that it starts rotating, and that when the rotational control ring is turned in said first direction in a second operational condition in which the at least one electrically driven drive wheel is already rotating, the at least one electrically driven drive wheel is driven and controlled such that its speed of rotation is increased, and
• wherein the push control knob is designed such that when it is pushed in said second operational condition in which the at least one electrically driven drive wheel is rotating due to a torque delivered to it, the generation of torque delivered to said at least one electrically driven drive wheel is stopped.