A crank power measurement system measures one or more of force, torque, power, and velocity of the crank, and includes a crank, two or more strain gauges located on a surface of the crank, and electronics for receiving strain data from the two or more strain gauges and determining at least one or more of bend-strain, shear-strain, and axial strain. A bicycle crank mounted power generator generates power when the bicycle is being ridden by a user, and includes a base ring, with a plurality of magnets, attached to a frame of the bicycle and circling a bottom bracket attached to a crank, a coil system attached to the crank adjacent to the plurality of magnets to generate an output at leads of the coil, and electronics configured to manipulate the output to power an electronic device and/or store the output in a power supply.

A crank power measurement system measures one or more of force, torque, power, and velocity of the crank, and includes a crank, two or more strain gauges located on a surface of the crank, and electronics for receiving strain data from the two or more strain gauges and determining at least one or more of bend-strain, shear-strain, and axial strain. A bicycle crank mounted power generator generates power when the bicycle is being ridden by a user, and includes a base ring, with a plurality of magnets, attached to a frame of the bicycle and circling a bottom bracket attached to a crank, a coil system attached to the crank adjacent to the plurality of magnets to generate an output at leads of the coil, and electronics configured to manipulate the output to power an electronic device and/or store the output in a power supply.

A method of adjusting the closing force of a door coupled to a door closer assembly having a bias element. The method includes determining the kinetic energy of the door without using the weight or other dimensions of the door. The determined kinetic energy is used to adjust the closing force of an electro-mechanical door closer that includes a spring and a motor. The door includes the use of one, some of, or all of an accelerometer, an angular position sensor, a time to close, a breaking torque, and a controller to identify values of acceleration, velocity, and/or position of the door. The identified values are provided to the controller, which is configured to calculate the kinetic energy of the door. The calculated kinetic energy is used to determine the closing velocity of the door closure to ensure proper operation of the door at the point of installation.

Provided is a dynamometer-system dynamo control device that can appropriately suppress the occurrence of resonance phenomena and can realize a no-load state, even in a case where an engine the inertia of which is unknown is connected. The dynamometer system comprises a dynamometer and a shaft torque meter. A dynamo control device 6 in the dynamometer system generates a torque current command signal on the basis of a torque detection signal and a torque command signal. The dynamo control device 6 comprises: a gain calculation unit 62 that multiplies the difference between the torque command signal and the torque detection signal by gain wATR and then by Ki; an integration operation unit 63 that integrates the output signal of the gain calculation unit 62; a high-pass filter 64 characterized by a response frequency wHPF; and a torque current command signal generation unit 65 that generates a torque current command signal by superimposing, onto the output signal of the integration operation unit 63, an output signal obtained by inputting the torque detection signal to the high-pass filter 64.

A power meter for a bicycle includes a body having a torque input section and a torque output section, the body configured to transmit power between the torque input section and the torque output section. The power meter also includes a printed circuit board (PCB) having a substrate and at least one strain measurement device which may be attached to the PCB.

A bicycle (10) includes a frame (25) having a bottom bracket (40), a crankset (35) attached to the bottom bracket (40), a pedal (50) coupled to the crankset (35) and operable to propel the bicycle (10) in response to a force acting on the pedal (50). The bicycle further includes a first bicycle component acted upon by the pedal (50) in response to the force, a second bicycle component coupled and responsive to the first bicycle component, and a power vector sensor (85) coupled to and positioned between the first bicycle component and the second bicycle component, and the power vector sensor (85) includes a sensor element (100) to sense a force transferred from the first bicycle component to the second bicycle component and indicative of the force acting on the pedal (50).

The present invention provides a more accurate method for measuring the automobile horsepower, specifically the internal combustion engine, ICE horsepower at the crankshaft, or the electric motor(s') horsepower, or the combined ICE and electric motor(s') horsepower. It applies to automobiles that do not incorporate, or can disengage, regenerative braking, RGB.

In contrast to the in-house, chassis dynamometers that measure the performance of the automobile under conditions that simulate to a certain extent road conditions, the proposed invention measures horsepower in real road test conditions, through the utilization of an accelerometer that performs measurements of the automobile velocity, acceleration and deceleration.

Provided is a dynamometer-system dynamo control device that can appropriately suppress the occurrence of resonance phenomena and can realize a no-load state, even in a case where an engine the inertia of which is unknown is connected. The dynamometer system comprises a dynamometer and a shaft torque meter. A dynamo control device 6 in the dynamometer system generates a torque current command signal on the basis of a torque detection signal and a torque command signal. The dynamo control device 6 comprises: a gain calculation unit 62 that multiplies the difference between the torque command signal and the torque detection signal by gain wATR and then by Ki; an integration operation unit 63 that integrates the output signal of the gain calculation unit 62; a high-pass filter 64 characterized by a response frequency wHPF; and a torque current command signal generation unit 65 that generates a torque current command signal by superimposing, onto the output signal of the integration operation unit 63, an output signal obtained by inputting the torque detection signal to the high-pass filter 64.

Measuring devices and methods for ascertaining an operating parameter at a shaft are disclosed. The shaft may be supported by at least one bearing. In one example, the measuring device includes at least one first sensor element configured to detect an absolute angle of the shaft and at least one second sensor element configured to detect a change in a distance of the shaft from the at least one second sensor element. A computing device may be configured to calculate one or more operating parameters at the shaft from the absolute angle of the shaft and the change in the distance.

A power measurement device, which may be mounted to an inside area of a crank arm, includes processing circuitry within a housing. The processing circuitry is coupled with strain gauges mounted on the crank arm, and produces a power value that is wireless transmitted to a separate display that may receive and display power measurements. The housing may include a mounted portion and a cantilever portion where the mounted portion houses the processing circuitry and the cantilever portion houses batteries supply energy for the processing circuitry and other features.