A system and method for measuring a speed of an engine are provided. The engine has a positive displacement pump drivingly connected to a rotor shaft thereof, the pump having an inlet for receiving a fluid supply and an outlet for outputting pressurized fluid. A sensor signal is received from a pressure sensing device provided at an inlet of the pump, the sensor signal comprising a series of periodic oscillations. A frequency of the oscillations is determined, the frequency proportional to a rotational speed of the rotor shaft. The speed of the engine is then determined from the frequency of the oscillations and the speed of the engine as determined is output for controlling operation of the engine.

A system and method for measuring a speed of an engine are provided. The engine has a positive displacement pump drivingly connected to a rotor shaft thereof, the pump having an inlet for receiving a fluid supply and an outlet for outputting pressurized fluid. A sensor signal is received from a pressure sensing device provided at an inlet of the pump, the sensor signal comprising a series of periodic oscillations. A frequency of the oscillations is determined, the frequency proportional to a rotational speed of the rotor shaft. The speed of the engine is then determined from the frequency of the oscillations and the speed of the engine as determined is output for controlling operation of the engine.

The present invention is applicable to the field of videos. Provided are an anti-shake method and apparatus for a panoramic video, and a portable terminal. The method comprises: acquiring, in real time, a current state timestamp, an accelerometer numerical value and an angular velocity numerical value of a gyroscope in a portable terminal; performing estimation using extended Kalman filtering combined with the accelerometer numerical value and the angular velocity numerical value to obtain an amount of rotation of the portable terminal to a world coordinate system; synchronizing the timestamp of the gyroscope with a timestamp of a panoramic video frame; performing quaternion interpolation on the state of the gyroscope to acquire a rotation matrix corresponding to the panoramic video frame; and rotating a panoramic image according to the current rotation matrix to generate a stable video frame.

The present invention is applicable to the field of videos. Provided are an anti-shake method and apparatus for a panoramic video, and a portable terminal. The method comprises: acquiring, in real time, a current state timestamp, an accelerometer numerical value and an angular velocity numerical value of a gyroscope in a portable terminal; performing estimation using extended Kalman filtering combined with the accelerometer numerical value and the angular velocity numerical value to obtain an amount of rotation of the portable terminal to a world coordinate system; synchronizing the timestamp of the gyroscope with a timestamp of a panoramic video frame; performing quaternion interpolation on the state of the gyroscope to acquire a rotation matrix corresponding to the panoramic video frame; and rotating a panoramic image according to the current rotation matrix to generate a stable video frame.

System, method, and devices related to a wheel speed sensor that includes a wireless communication device and a motion sensor. The motion sensor includes an accelerometer. The wireless communication device and motion sensor are disposed in a housing. The housing is attached to an attachment member. The attachment member is selectively attached to a wheel of a towed vehicle.

The present invention is applicable to the field of videos. Provided are an anti-shake method and apparatus for a panoramic video, and a portable terminal The method comprises: acquiring, in real time, a current state timestamp, an accelerometer numerical value and an angular velocity numerical value of a gyroscope in a portable terminal; performing estimation using extended Kalman filtering combined with the accelerometer numerical value and the angular velocity numerical value to obtain an amount of rotation of the portable terminal to a world coordinate system; synchronizing the timestamp of the gyroscope with a timestamp of a panoramic video frame; performing quaternion interpolation on the state of the gyroscope to acquire a rotation matrix corresponding to the panoramic video frame; and rotating a panoramic image according to the current rotation matrix to generate a stable video frame.

The present invention is applicable to the field of videos. Provided are an anti-shake method and apparatus for a panoramic video, and a portable terminal The method comprises: acquiring, in real time, a current state timestamp, an accelerometer numerical value and an angular velocity numerical value of a gyroscope in a portable terminal; performing estimation using extended Kalman filtering combined with the accelerometer numerical value and the angular velocity numerical value to obtain an amount of rotation of the portable terminal to a world coordinate system; synchronizing the timestamp of the gyroscope with a timestamp of a panoramic video frame; performing quaternion interpolation on the state of the gyroscope to acquire a rotation matrix corresponding to the panoramic video frame; and rotating a panoramic image according to the current rotation matrix to generate a stable video frame.

A physical quantity sensor includes a driven section and a drive spring that supports the driven section so that the driven section is displaceable in a first direction. The drive spring has a serpentine shape and includes a plurality of spring structures extending in a second direction that intersects a first direction. At least one of the spring structures has a thin section that is thinner in a third direction that intersects the first and second directions than the other portions of the drive spring.

A physical quantity sensor includes a driven section and a drive spring that supports the driven section so that the driven section is displaceable in a first direction. The drive spring has a serpentine shape and includes a plurality of spring structures extending in a second direction that intersects a first direction. At least one of the spring structures has a thin section that is thinner in a third direction that intersects the first and second directions than the other portions of the drive spring.

A system and method for measuring a speed of an engine are provided. The engine has a positive displacement pump drivingly connected to a rotor shaft thereof, the pump having an inlet for receiving a fluid supply and an outlet for outputting pressurized fluid. A sensor signal is received from a pressure sensing device provided at an inlet of the pump, the sensor signal comprising a series of periodic oscillations. A frequency of the oscillations is determined, the frequency proportional to a rotational speed of the rotor shaft. The speed of the engine is then determined from the frequency of the oscillations and the speed of the engine as determined is output for controlling operation of the engine.