When an electric vehicle is traveling downhill, experiencing regenerative braking, or otherwise forcing the vehicle motor to turn faster than the commanded motor torque, the vehicle motor produces electrical energy that can be used to recharge a vehicle battery. However, if the vehicle battery is already nearly or fully charged, the excess electrical energy produced may damage the battery. Control systems described herein may reduce and/or dispose of the excess energy by manipulating the motor flux (i.e., direct) current and quadrature current independently.

A system for measuring power generated by a skier is disclosed. The power generated by the skier may be calculated based upon each complete revolution of a ski pole or ski movement. To do so, the system may include various sensors that measure a force exerted on a ski pole or ski, the angle of the ski pole or ski, and the velocity of the skier at various time instants within each ski pole or ski revolution. A processing unit may calculate power generated by the skier in the skier's direction of travel using the force exerted in the skier's direction of travel during a complete revolution of ski pole (or ski) movement and the velocity of the skier.

A personal transport system is provided including, in an embodiment, an electrically powered vehicle, a companion remote control, and a companion mobile phone application. The vehicle includes an operator-supporting deck, one or more deck-mounted trucks, one or more axle-mounted wheels on each of the one or more trucks, one or more batteries, and a deck lighting system. The one or more batteries power a motor configured to drive the wheels by way of a pulley system, at least one battery of which is disposed under a battery enclosure. The battery enclosure has a first light indicator system, and the companion remote control has a second light indicator system, each of which is configured for communicating with the operator. The deck lighting system includes a light strip of light-emitting diodes disposed in a groove of the deck configured to change state to communicate with the operator or others sharing a road.

A method is disclosed for foot sensors to be used to determine at least two characteristics of a subject's activity by using a combination of sensors for force and foot orientation/motion/position. A wearable footwear ecosystem is comprised of the subject's footwear, sensor-enabled insoles or insertable devices, in- or on-footwear electronics that is hard wired to the sensors and may contain additional sensors such as accelerometers, a master device and means to communicate (typically wirelessly) among the various sensor platforms, and the master device including clock synchronization. Correlating the time stamps for data among various sensors, and the master device communicating wirelessly is critical to accurate determination of the desired characteristics. Multiple force-sensitive resistors on a common substrate are individually optimized for dynamic range. Pulse sensors using arrays of such force-sensitive resistors are implemented. The resultant system can profitably be used for gaming, biometric monitoring, and activity tracking.

The embodiments of the present disclosure provide roller-skating device and electric balance vehicle, including: footboard, one or more ground contacting elements, first sensor, one or more driving elements and first controller. Footboard is coupled to first sensor and ground contacting elements which are coupled to driving element, and first controller is coupled to first sensor and driving element. Footboard is configured to stand on one foot, and to tile forwards or backwards in the case of one foot standing; one or more ground contacting elements are configured to act due to actuation of driving element; first sensor is configured to sense posture of driver on footboard; one or more driving elements are configured to generate output signal for controlling action of ground contacting elements and maintaining entire roller-skating device in balance; and first controller is configured to control generation of output signal depending on posture.

A ski may define a body that defines a tip, a tail opposite the tip, a top sheet, a base extending from the tip to the tail and opposite the top sheet, a core layer positioned between the base and the top sheet, and a reinforcement layer positioned between the top sheet and the base. The reinforcement layer defines an aperture extending through the reinforcement layer and positioned within a first third of a length of the ski, the length defined from the tip to the tail.

A self-propelled, one-wheeled vehicle may include a suspension system configured to provide arcuate, generally vertical motion of a board relative to an axle of a central wheel assembly when the vehicle encounters obstacles and bumps on a riding surface. Illustrative suspension systems may include a shock absorber and a swingarm that couple the wheel assembly to the board.

An autonomous skateboard comprising an autonomous controller system comprising software associated with monitoring operational processes of an electric powered truck governed by an environmental sensor array and motion sensors including; load sensors, deformation sensors, gyroscope sensor, and accelerators, accordingly a power control module provides battery power to the electric motors. The autonomous skateboard configured to independently operate with or without an operator riding onboard. The operator uses their smartphone to manually control or verbally control the autonomous skateboard, the operator accesses a mobile app, customizes user preference settings, whereby software algorithms and user interface instructions allow the operator to control their autonomous skateboard when riding, or summon the autonomous skateboard to drive over to her or him, respectively the operator can utilizes their preference settings to select a custom drive mode with max speed calculated. The operator's smartphone is configured with a user interface system linked to the autonomous skateboard by WIFI or Bluetooth, the operation data and performance data gathered by the operator is saved in memory, Cloud management network or both.

A self-propelled, one-wheeled vehicle may include a suspension system configured to provide arcuate, generally vertical motion of a board relative to an axle of a central wheel assembly when the vehicle encounters obstacles and bumps on a riding surface. Illustrative suspension systems may include a shock absorber and a swingarm that couple the wheel assembly to the board.

Articles of clothing or pieces of athletic equipment include modules, e.g., for sensing physical and/or physiological characteristics associated with use of the clothing or athletic equipment or for performing other functions. Such systems and methods may use physical or other interaction(s) between the module and the article of clothing or piece of athletic equipment for activating and/or deactivating the module and/or sensing devices included with the module, for confirming whether the module and clothing or piece of athletic equipment are authorized for use with one another, and/or for automatic data algorithm selection methods. Additionally, such systems and methods also may use the activation and/or authentication systems for data input to the module. Some examples of such systems and methods may utilize magnets and magnetic sensing systems and/or light (or other radiation) sources and sensing systems for activation, authentication, data input, and/or algorithm selection.