Torque Measurement with Increased Accuracy at Lower Torque Values

Abstract: an apparatus () such as an electronic torque wrench () is provided that includes an amplifier (), analog-to-digital converter () and processing circuitry (). the amplifier () is configured to receive an analog electrical signal that varies in voltage with an applied torque, and increase amplitude of the analog electrical signal to produce an amplified, analog electrical signal. the amplifier () has a gain that is controllable and set based on a measured torque. the analog-to-digital converter () is configured to convert the amplified, analog electrical signal to an equivalent digital electrical signal. and the processing circuitry () is configured to determine the torque value of the torque applied to the fastener from the equivalent digital electrical signal, and output an indication of the torque value. a method of determining a torque value of an applied torque is also provided.

Inventor(s): Bin Sun, Henglian Luo, Tong Li

CPC Classification: B25B23/1425 ({by electrical means})

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