Controller for a device with change in characteristics
AssigneeTexas Instruments Incorporated
InventorHitoshi Kondoh
Life of this patent
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Abstract
A device characteristic changing apparatus is provided for changing a characteristic of a device. The device characteristic changing apparatus comprises a time scale generator unit for generating a time scale on which a device operates, and a time scale changing unit for changing the time scale, so that a characteristic of a device is changed by changing the time scale on which the device operates.
Claims31
A device characteristic changing method comprising the steps of operating a device on a first time scale having a time scale coefficient to cause a characteristic of the device to have a first value, and then changing the characteristic by operating the device on a second time scale by updating a value of the time scale coefficient,
- wherein said characteristic is a time dependent characteristic,
- wherein said time dependent characteristic is an input/output response characteristic of said device,
- wherein said device is a controller for use in a control system for controlling a controlled object, and
- wherein said controller performs a feedforward control.
A device characteristic changing apparatus for changing a characteristic of a device, comprising:
- time scale generating means for generating a time scale having a time scale coefficient on which a device operates, and time scale changing means for changing said time scale by updating a value of the time scale coefficient,
- wherein said device has a first characteristic when it operates on a first time scale, and has a second characteristic when it operates on a second time scale, and
- wherein said characteristic is changed while maintaining a transfer function of said device substantially constant;
- and
- transfer function change compensating means for compensating a change in said transfer function resulting from a change in said time scale.
A method of controlling a controlled object in response to an input signal comprising the steps of:
- generating a manipulated variable for said controlled object in response to said input signal in accordance with a predetermined transfer function including a time constant;
- providing said transfer function by transfer element means included in a controller which is used in a control system for controlling said controlled object;
- generating a state value representative of a state of said controlled object;
- generating a time scale changing value from said state value using a predetermined time scale changing function;
- and
- changing said time constant of said transfer function in response to said time scale changing value.
A sampling period adaptive controlled tracking system, comprising:
- (a) a phase error detector having a first input coupled to a reference clock signal;
- (b) a controller including
- i. a gain controller having an input coupled to an error output signal produced by the phase error detector,
- ii. a frequency estimator having an input coupled to an output of the gain controller,
- iii. a phase tuner having an input coupled to an output of the frequency estimator,
- iv. a state observer circuit having a first input coupled to receive information regarding the phase tuner, and also having a second input coupled to the error output signal,
- v. an adaptive controller having in input coupled to an output of the state observer circuit, and producing a time scale signal coupled to the frequency estimator and the phase tuner, and also producing a transfer function changing signal coupled to a gain control input of the gain controller;
- and
- (c) a digitally controlled oscillator having an input coupled to an output of the phase tuner, and producing a master clock signal.
Dependencies are inferred from the claim text.