Locomotive governor control
First Claim
1. A control system for an engine-generator unit (10,14) of the type having a fuel delivery control (12) and a field current controller (28), comprising:
- a power selector (22) having a plurality of selectable power settings;
speed calculator means (24) for deriving a speed error signal as a function of the power selector setting and the actual engine speed and for applying an output which is a function of the speed error signal to the fuel delivery controller (12); and
rack calculator means (26) for deriving a rack error signal as a function of actual engine speed and actual fuel delivery controller setting and for applying an output to the field current controller (28) which is a function of the rack error signal.
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Accused Products
Abstract
A digital processor implemented electronic governor for engine-generator units including a first control loop for producing a speed error and controlling fuel delivery setting as a function thereof and a second control loop for detecting rack error and producing a field excitation current control signal as a function thereof. Power dips and overruns are voided by modifying rack error as a function of engine acceleration. Means are provided for developing speed errors and rack control signals despite a breakdown in the rack position indicator. Open loop lower power setting controls are provided. Wheel-slip control, power limiting and variable acceleration functions are provided.
76 Citations
22 Claims
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1. A control system for an engine-generator unit (10,14) of the type having a fuel delivery control (12) and a field current controller (28), comprising:
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a power selector (22) having a plurality of selectable power settings; speed calculator means (24) for deriving a speed error signal as a function of the power selector setting and the actual engine speed and for applying an output which is a function of the speed error signal to the fuel delivery controller (12); and rack calculator means (26) for deriving a rack error signal as a function of actual engine speed and actual fuel delivery controller setting and for applying an output to the field current controller (28) which is a function of the rack error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of controlling the operation of an engine-generator unit of the type having a rack position control and a field current control comprising the steps of
(a) generating a power setting signal (b) developing a desired speed signal from the power setting signal (c) developing a speed control error eN from a comparison of the desired speed signal and actual speed (d) setting the rack control as a complex function of eN (e) developing a desired rack signal from the actual speed; -
(f) developing a rack error eR from a comparison of desired rack and actual rack position; and (g) setting field current as a complex function of eR. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A control system for a combination engine-load unit (10,14) wherein the power consumption of the load is variable according to a signal applied to a control input of a load controller (28), and wherein the engine is of the type having a fuel delivery control (12) comprising:
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a power selector (22) having a plurality of selectable power settings; engine speed calculator means for deriving a speed error signal as a function of the power selector setting and the actual engine speed and for applying an output which is a function of the speed error signal to the fuel delivery controller (12); and
,rack calculator means (26) for deriving a rack error signal as a function of actual engine speed and actual fuel delivery controller setting and for applying a control signal to the control input of the variable load controller (28) which is a function of the rack error signal.
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Specification