System parameter identification method based on rate-limited relay with hysteresis and sinusoidal injection

A method, comprising:

• outputting, by a system comprising at least one processor as a first stage of a parameter identification sequence, a control signal to a controlled system as a rate-limited relay-based control output, wherein the outputting produces an oscillation of an output signal of the controlled system at a first phase;
• in response to a determination that the output signal is in oscillation during the relay-based control stage, outputting, by the system as a second stage of the parameter identification sequence, the control signal to the controlled system as an open-loop sinusoidal control output having a second phase that is substantially aligned with the first phase;
• and
• determining, by the system, one or more system parameters of the controlled system based on a data set obtained via measurement of the control signal and the output signal during the first stage and the second stage.

A non-transitory computer-readable medium having stored thereon executable components that, in response to execution by a system comprising a processor, cause the system to perform operations, the operations comprising:

• performing rate-limited relay-based control of a controlled system, comprising outputting a control signal to the controlled system as a rate-limited relay-based control output, wherein the outputting produces an oscillation of an output signal of the controlled system at a first phase;
• in response to a determination that the output signal is in oscillation during the rate-limited relay-based control stage, performing open-loop sinusoidal signal injection control of the controlled system, comprising outputting the control signal to the controlled system as a sinusoidal control output having a second phase that is substantially aligned with the first phase;
• and
• determining one or more system parameters of the controlled system based on a data set obtained via measurement of the control signal and the output signal during the rate-limited relay-based control and the open-loop sinusoidal signal injection control.