Model predictive control for HPI closed-loop fuel pressure control system
First Claim
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1. A method of providing feedback in a closed-loop control system which controls a first system, comprising the steps of:
- (a) predicting an expected output of the first system using a model of the first system;
(b) feeding back the expected output as a first feedback input to the control system;
(c) computing an error between an actual output of the first system and the expected output;
(d) filtering the error in order to attenuate unwanted frequency components;
(e) creating a second feedback input based on the filtered error;
(f) feeding back the second feedback input to the control system, wherein there is a delay between feedback of the first and second feedback inputs;
(g) producing a control system output based upon the first and second feedback inputs; and
(h) applying the control system output to the first system in order to control the first system.
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Abstract
A closed-loop control system having two feedback paths 106, 108. A first feedback path contains an expected system output value generated by a system model 102. The second feedback path provides insensitivity to noise by heavily filtering the error between the model output 104 and the actual measured system output 74. Because of the delay associated with the filtering operation, the dual feedback paths result in an initial fast (but approximated) system response, followed by a delayed correction to that response.
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Citations
23 Claims
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1. A method of providing feedback in a closed-loop control system which controls a first system, comprising the steps of:
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(a) predicting an expected output of the first system using a model of the first system; (b) feeding back the expected output as a first feedback input to the control system; (c) computing an error between an actual output of the first system and the expected output; (d) filtering the error in order to attenuate unwanted frequency components; (e) creating a second feedback input based on the filtered error; (f) feeding back the second feedback input to the control system, wherein there is a delay between feedback of the first and second feedback inputs; (g) producing a control system output based upon the first and second feedback inputs; and (h) applying the control system output to the first system in order to control the first system. - View Dependent Claims (2, 3, 4)
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5. A method of providing fast response from a first system controlled by a closed-loop control system, comprising the steps of:
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(a) inputting a desired first system output signal to the control system; (b) generating a first system input signal from the control system based on the desired first system output signal; (c) generating an expected first system output signal based on the first system input signal; (d) feeding back the expected first system output signal as a first feedback input to the control system; (e) applying the first system input signal to the first system; (f) generating an actual first system output signal from the first system; (g) generating an error input signal equal to a difference between the actual first system output signal and the expected first system output signal; (h) generating an error output signal based on the error input signal; and (i) feeding back the error output signal as a second feedback input to the control system, wherein there is a delay between feedback of the first and second feedback inputs; (j) producing a control system output based upon the first and second feedback inputs; and (k) applying the control system output to the first system in order to control the first system. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A fuel pressure system employing model predictive closed-loop control, comprising;
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a reservoir adapted to hold a quantity of fuel; a fuel pump operable to supply the fuel to a fuel injection system at a rate; a pressure control device operatively coupled to the fuel injection system and operable to establish a fuel pressure in the fuel injection system, wherein the fuel is delivered to at least one fuel injector at the fuel pressure; a pressure transducer operatively coupled to the fuel injection system and operable to produce a measured fuel pressure signal proportional to the fuel pressure; and a control system operable to receive an input from the pressure transducer and provide a pressure control output to the pressure control device, wherein the control system generates the pressure control output using a model predictive first feedback signal and a second feedback signal based on the measured fuel pressure signal. - View Dependent Claims (13, 14, 15, 16)
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17. A closed-loop control system employing model predictive control to control a first system, comprising:
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means for predicting an expected output of the first system using a model of the first system; means for feeding back the expected output as a first feedback input to the control system; means for computing an error between an actual output of the first system and the expected output; means for filtering the error in order to attenuate unwanted frequency components; means for creating a second feedback input based on the filtered error; means for feeding back the second feedback input to the control system, whereby there is a delay between feedback of the first and second feedback inputs; means for producing a control system output based upon the first and second feedback inputs; and means for applying the control system output to the first system in order to control the first system. - View Dependent Claims (18, 19, 20)
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21. A method of providing feedback in a closed-loop control system which controls a first system, comprising the steps of:
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(a) calculating a first portion of a control algorithm in a feedforward path; (b) predicting an expected output of the first system using a model of the first system; (c) using the expected output to calculate a second portion of the control algorithm, thereby creating a first feedback input; (d) feeding back the first feedback input to the first portion; (e) computing an error between an actual output of the first system and the expected output; (f) filtering the error in order to attenuate unwanted frequency components; (g) creating a second feedback input based on the filtered error; (h) feeding back the second feedback input to the first portion, wherein both pole and zero locations of the control algorithm may be assigned arbitrarily; (i) producing a control system output based upon both the first and second feedback inputs; and (j) applying the control system output to the first system in order to control the first system. - View Dependent Claims (22, 23)
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Specification