Skateboard for Maintaining Cruising Speed
An electric skateboard includes a motor, a controller, and a pressure sensor located in a footboard. When a user of the skateboard places a foot on the pressure sensor, the controller measures an actual or estimated speed of the skateboard, and outputs a control signal to the motor to maintain the measured speed. When a user removes his foot from the pressure sensor, the controller sends a control signal to stop the motor.
1 . An electric skateboard, comprising:
a footboard;
a plurality of wheels connected to the footboard and configured to rotate relative to the footboard,
wherein the wheels rotate about an axis of rotation that is perpendicular to
a longitudinal axis of the footboard;
a controller mounted to the footboard;
a motor mounted to the footboard and in signal communication with the controller; and
a pressure sensor mounted to the footboard and in signal communication with the controller,
wherein the pressure sensor is configured to send a pressure signal to the controller upon detecting a foot placed on the pressure sensor,
wherein the controller is configured to measure an angular velocity of the motor upon receiving the pressure signal from the pressure sensor,
wherein the controller is configured to output a control signal to the motor upon receiving the pressure signal, and
wherein the control signal causes the motor to output a torque sufficient to maintain the measured angular velocity.
2 . The electric skateboard of claim 1 , wherein the motor is contained within a wheel.
3 . (canceled)
4 . (canceled)
5 . The electric skateboard of claim 1 , wherein the control signal causes the motor to output a cruising torque.
6 . (canceled)
7 . The electric skateboard of claim 1 , wherein the controller does not output the control signal when the pressure signal is not present.
8 . The electric skateboard of claim 1 , wherein the plurality of wheels comprises at least 4 wheels.
9 . A method for operating an electric skateboard comprising the steps of:
manually moving the electric skateboard forward without engaging an electric motor;
engaging a pressure sensor on the electric skateboard to output a pressure signal to a controller on the electric skateboard,
wherein the controller measures a current speed of the skateboard upon receipt of the pressure signal, generates a control signal corresponding to the measured speed of the skateboard, and outputs the control signal to a motor,
wherein the motor outputs a torque sufficient to maintain the measured speed of the skateboard upon receipt of the control signal; and
disengaging the pressure sensor on the electric skateboard,
wherein the pressure sensor ceases outputting the pressure signal upon disengagement,
wherein the controller to ceases outputting the control signal upon cessation of the pressure signal, and
wherein the motor ceases outputting the torque upon cessation of the control signal.
10 . The method for operating the electric skateboard of claim 9 , wherein the controller measures the current speed of the skateboard using a position sensor.
11 . The method for operating the electric skateboard of claim 9 , further comprising a sensor used to detect an angular velocity of a wheel of the electric skateboard.
12 . The method for operating the electric skateboard of claim 9 , wherein the controller continues to output the control signal for as long as the pressure sensor is engaged.
13 . A skateboard comprising:
a footboard;
a plurality of wheels connected to the footboard and configured to rotate relative to the footboard;
a controller mounted to the footboard,
wherein the controller is configured to detect a speed of the skateboard;
a motor mounted to the footboard and in signal communication with the controller;
a battery connected to the controller and to the motor, to provide electrical current to both the controller and the motor; and
a pressure sensor mounted to the footboard and configured to send a pressure signal to the controller upon detecting a foot placed on the pressure sensor,
wherein the controller outputs a control signal to the motor corresponding to the speed signal, after receiving the pressure signal, and
wherein the control signal causes the motor to output a torque sufficient to maintain a speed that is less than the detected speed of the skateboard.
14 . The skateboard of claim 13 , further including a position sensor mounted to the skateboard, and wherein the controller detects the speed of the skateboard by receiving a signal from a position sensor mounted to the skateboard.
15 . The skateboard of claim 13 , wherein the controller detects the speed of the skateboard by measuring an angular velocity of a wheel at the time the controller receives the pressure signal.
16 . The skateboard of claim 15 , wherein the control signal corresponds to the measured angular velocity of the wheel at the time the controller receives the pressure signal.
17 . The skateboard of claim 15 , wherein the control signal corresponds to a cruising angular velocity that is less than the measured angular velocity of the wheel at the time the controller receives the pressure signal.
18 . The skateboard of claim 13 , wherein the control signal causes the motor to output the torque for as long as the control signal is generated.
19 . The skateboard of claim 13 , wherein the pressure sensor is located on a top surface of the footboard.
20 . The skateboard of claim 19 , further including an abrasive paster located on a top surface of the pressure sensor.
21 . The skateboard of claim 13 , wherein the motor is housed inside one of the plurality of wheels.