Angular resolver imbalance detection

Abstract

In described examples, an angular resolver system includes an imbalance detector (1600) for detecting degraded resolver output signals. The imbalance detector (1600) includes first (1602) and second (1604) power averaging circuits and a comparator circuit (1662, 1664, 1670). The first power averaging circuit (1602) includes a first integrator (1646) for generating over a first time window a firstaverage power signal (Vcl) in response to resolver sensor output signals. The second power averaging circuit (1604) includes a second integrator (1648) for generating over a second time window a second average power signal (Vc2) in response to the resolver sensor output signals, where the first time window is longer than the second time window. The comparator circuit (1662, 1664, 1670) compares the first average power signal and the second average power signal and generates a fault signal (1670) when the first average power signal and the second average power signal differ by a selected voltage threshold (1654, 1658).

Description

Background technique [0001] Computers, including processors, are increasingly used to control the movement of physical devices such as electric motors and robots. The computer controls the movement of these physical devices in response to position (including velocity) information received from the sensors. Information from sensors is typically communicated as one or more electrical signals. However, sensors are often located in electrically noisy environments such as gasoline engine compartments, where components such as switches and coils generate substantial electromagnetic interference, which often degrades the quality and resolution of the transmitted electrical signal. A degraded electrical signal limits the speed and / or accuracy of controlled properties of the controlled physical device, such as motor speed and angular displacement, which generally limits the extent to which a computer can control the physical device. Contents of the invention [0002] In the describ...

AI Technical Summary

Problems solved by technology

However, sensors are often located in electrically noisy environments (such as gasoline engine compartments), where components such as switches and coils generate significant electromagnetic interference, which often degrades the quality and resolution of the transmitted electrical signal

Degraded electrical signals limit the speed and / or accuracy of controlled properties (such as motor speed and angular displacement) of the controlled physical device, which often limits the extent to which a computer can control the physical device

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