A frame and suspension for a vehicle provides automatic lean and
alignment. The lean is determined by force sensors, the speed and/or the
angle of turn and is provided by actuators in the suspension in
accordance with a predetermined protocol in an electronic control unit
(ECU). The protocol also provides shock absorption by rapidly tracking a
contour of a surface on which the vehicle rides. The suspension is
provided by a plurality of arm assemblies each including a lower arm, an
upper control arm, and an actuator motively connected to the lower arm
and to the upper control arm. The arm assemblies are pivotally connected
to the frame on a common axis. The arm assemblies generally form
parallelograms and are actuated in concert to remain generally parallel
to each other through a range of angles to adjust the lean of the
vehicle. The arm assemblies are also actuated independently of each other
to accommodate variations in the contour. In one aspect, an actuator
controlled by an ECU can be replaced by a mechanical actuator that can be
activated manually such as by a driver's own leaning weight.