The present application relates to a method for determining an efficiency and/or for calibrating a torque of a drivetrain (1), in particular a drivetrain (1) of a wind turbine. The method for determining an efficiency and/or for calibrating a torque of a drivetrain (1), in particular of a drivetrain of a wind turbine, is particularly suited for carrying out on a test rig and comprises two tests. The drivetrain has a motor-side end at a main shaft connectable to a motor and a generator-side end, between which ends a generator is arranged. In a first test, the motor-side end of the drivetrain (1) is driven. A variable dependent on the main shaft torque is thereby determined at the motor-side end of the drivetrain (1) and an electrical power P.sub.elec is determined at the generator-side end of the drivetrain (1). In a second test, the generator-side end of the drivetrain (1) is driven and the variable dependent on the main shaft torque is likewise determined at the motor-side end and the electrical power P.sub.elec is determined at the generator-side end. An efficiency and/or calibration parameters is/are determined from the electrical power values and the variables dependent on the main shaft torque determined in the first test and in the second test.

A bicycle trainer compensation algorithm based on multi-groove belts relatively sliding to one another includes: determining a load interval and a rotating speed range, recording an external driving torque, a rotating speed, a measured torque and a no-load mechanical loss of the bicycle trainer under conditions of different loads and different rotating speeds, and obtaining a relationship between a mechanical loss of a whole machine and the rotating speed, the load, and the no-load mechanical loss, fitting a plurality of sets of relationships to obtain an algorithm relation, verifying universality of the algorithm relation, and further fitting to obtain a compensation algorithm relation, and verifying whether a compensation accuracy of the compensation algorithm relation is satisfied within an error requirement.

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.

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.

A power measuring system includes a processor, a control unit, a memory unit, and a power sensor including a sensing unit and a signal processing unit correspondingly outputting an electrical signal according to a deformation of the sensing unit. The sensing unit is disposed to either a right operational part or a left operational part of a bicycle. The control unit is controlled by a user and outputs a weighting command. The processor receives the weighting command and stores the weighting command into the memory unit, and obtains a weighting parameter corresponding to the weighting command according to a reference table stored in the memory unit, and receives the electrical signal outputted from the signal processing unit, and calculates a first power value, and multiplies the first power value by the weighting parameter to get a second power value, and adds the first power value and the second power value to obtain a total power value.

A power measuring system includes a processor, a control unit, a memory unit, and a power sensor including a sensing unit and a signal processing unit correspondingly outputting an electrical signal according to a deformation of the sensing unit. The sensing unit is disposed to either a right operational part or a left operational part of a bicycle. The control unit is controlled by a user and outputs a weighting command. The processor receives the weighting command and stores the weighting command into the memory unit, and obtains a weighting parameter corresponding to the weighting command according to a reference table stored in the memory unit, and receives the electrical signal outputted from the signal processing unit, and calculates a first power value, and multiplies the first power value by the weighting parameter to get a second power value, and adds the first power value and the second power value to obtain a total power value.

An oarlock-installation for a boat in which an oarlock is mounted on an upright pin for angular displacement about the pin during rowing of the boat, the oarlock-installation comprising a mechanism for deriving measurements of angular displacement of the oarlock from a datum angle about the pin during the rowing, a mechanism for deriving measurements of force exerted on the oarlock during the rowing, and a mechanism for deriving measurement of rowing power from the measurements of force and the measurements of angular displacement. The rowing-boat oarlock-installation may also comprises a power module, attached to the oarlock, which is responsive to rowing of the rowing-boat to derive force measurements in accordance with rowing forces exerted on the power module during the rowing.

A power measurement assembly mounted within an axle. In a specific example, the axle is a spindle that is interconnects the cranks of a bicycle, exercise, bicycle, or other fitness equipment. The power measurement assembly may include strain gauges connected with an appropriate circuit (e.g., Wheatstone bridge) that provides an output of the force on the axle by a rider pedaling the crank. In the case of an axle, the strain gauges measure the torsion due to the applied torque on the crank. The value is converted to a power value by a processor and that value is then wirelessly transmitted for display. The processor and/or the transmitter may be mounted within the axle. A separate power measurement assembly may be mounted on one of the cranks, which may include its own processor and transmitter or may take advantage of the processor and transmitter within the axle.

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).

A bicycle component with a measuring device with a housing and a measuring probe connected therewith, including a probe body having an exterior opening. The exterior opening is connected through an air guide with a barometric pressure sensor disposed remote from the exterior opening. The air guide includes at least two air ducts and an internal chamber that is connected with two air ducts. One of the air ducts is configured as a supply duct and begins at the exterior opening. The other of the air ducts serves as a sensor duct and connects the internal chamber with the barometric pressure sensor.