Abstract: The invention relates to a modular vehicle system comprising an electric vehicle (2) and a module (16) which can be connected to the electric vehicle (2) by means of a plug connection, wherein the electric vehicle (2) at least has an on-board power supply system (3) for supplying power to an electric drive unit (6) of the electric vehicle (2), a control device (9) for communicating with the module (16), and an interface (15), which is connected to the on-board power supply system (3) and the control device (9), for connection to the module (16), which interface (15) forms a first element of the plug connection, wherein the module (16) at least has an electrical arrangement, a module controller (23) for communicating with the control device (9) of the electric vehicle (2), and a connection element (17) which is connected to the electrical arrangement and the module controller (23) and which forms a second element of the plug connection, wherein the interface (15) of the electric vehicle (2) is connected in a d

Abstract: A vehicle, particularly a wheelchair, comprises a wheelchair frame, an electronic control unit and at least two driving wheels, wherein at least the first driving wheel includes a device for manually applying a drive force and at least the second driving wheel is adapted to be driven via a drive unit having an electric motor. The electronic control unit is adapted to detect the distance covered by the first driving wheel due to rotation of said first driving wheel and to drive the drive unit having an electric motor of the second driving wheel depending on the distance covered by the first driving wheel for turning the second driving wheel.