Abstract: A method and a device for measuring a tangential reaction force of a resistance device on a flywheel, and the reaction force multiply the radius of the flywheel to obtain a torque, such that the torque multiply a gear ratio is the torque to overcome the resistance of flywheel on the drivetrain. The torque to overcome the resistance of flywheel on the drivetrain adding a torque to overcome the inertia of the flywheel and mechanical friction under the state of no resistance is the total torque presented on the drivetrain. Such that using the total torque to calculate power and energy consumption.

Abstract: A non-intrusive torque control device for pulse tools, and a method of monitoring torque of pulse tools include steps of establishing a characteristic curve (FIG. 6) specify relation of revolution-per-minute (or BPM) with output torques for a specific pulse tool. Then establish another relationship curve (FIG. 7) specify operational factors (such as supply air pressure) with revolutions-per-minute (or BPM) for the same pulse tool at calibration stage. Those two curves and threshold are stored in flash memory of BPM detector (part of torque control system). The BPM detector is attached on the surface of pulse tool at nearby of impact mechanism. When fastening a bolt, at tightening stage while the impact reach the threshold stored in memory of BPM detector then start monitoring. This is a complete close loop torque control exclusive for pulse tool only. Target torque can be pre-set manually or automatically if a wireless control proportional valve is available connected to air source.