US3870939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling acceleration and deceleration of a traction motor
Assignee: Engins Matra SA
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Filing: 1972-06-22
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Granted: 1975-03-11
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Expires: 1992-06-22
Abstract
Abstract Speed control system method for a traction motor in which speed setting signals are compared with the actual speed of the vehicle to provide a signal for selecting a value of the derivative of the setting acceleration, this derivative being integrated by an integrator taking the constraints relative to the integral into account, and the resultant setting acceleration serving to control the motor.
Inventors
- 👤 Michel Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:15
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/20; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
211 words
The method of controlling a traction motor, in the operation of a railroad train, rapid tansit train, or like vehicle, comprising the following steps: A. sensing the actual speed of the vehicle to develop an actual speed signal Vs; B. developing a speed setting signal VE; C. modifying the actual speed signal to advance the phase thereof, thus developing a modified actual speed signal; D. additively comparing the signals from steps B and C to develop a selector signal Epsilon ; E. differentiating the selector signal Epsilon within the constraint limits +a, 0, -a to develop a derivative of setting acceleration signal gamma having values as follows: gamma +a if Delta > OR = Epsilon 1 gamma 0 if - Epsilon 1 < Epsilon < + Epsilon 1 gamma -a if Epsilon < OR = Epsilon 1 wherein Epsilon 1 is of a predetermined amplitude; F. integrating the derivative of setting acceleration signal in accordance with 1/p and within acceleration constraint limits +L and -L to develop a setting acceleration signal gamma e; G. additively comparing the setting acceleration signal gamma e with an actual acceleration signal to develop an initial control signal gamma c; H. and effectively applying the initial control signal to the traction motor to control motor operation.
Claim 2
Independent Claim
211 words
The method of controlling a traction motor, in the operation of a railroad train, rapid tansit train, or like vehicle, comprising the following steps: A. sensing the actual speed of the vehicle to develop an actual speed signal Vs; B. developing a speed setting signal VE; C. modifying the actual speed signal to advance the phase thereof, thus developing a modified actual speed signal; D. additively comparing the signals from steps B and C to develop a selector signal Epsilon ; E. differentiating the selector signal Epsilon within the constraint limits +a, 0, -a to develop a derivative of setting acceleration signal gamma having values as follows: gamma +a if Delta > OR = Epsilon 1 gamma 0 if - Epsilon 1 < Epsilon < + Epsilon 1 gamma -a if Epsilon < OR = Epsilon 1 wherein Epsilon 1 is of a predetermined amplitude; F. integrating the derivative of setting acceleration signal in accordance with 1/p and within acceleration constraint limits +L and -L to develop a setting acceleration signal gamma e; G. additively comparing the setting acceleration signal gamma e with an actual acceleration signal to develop an initial control signal gamma c; H. and effectively applying the initial control signal to the traction motor to control motor operation.
Claim 3
Independent Claim
211 words
The method of controlling a traction motor, in the operation of a railroad train, rapid tansit train, or like vehicle, comprising the following steps: A. sensing the actual speed of the vehicle to develop an actual speed signal Vs; B. developing a speed setting signal VE; C. modifying the actual speed signal to advance the phase thereof, thus developing a modified actual speed signal; D. additively comparing the signals from steps B and C to develop a selector signal epsilon ; E. differentiating the selector signal epsilon within the constraint limits +a, 0, -a to develop a derivative of setting acceleration signal gamma having values as follows: gamma +a if Delta > or = epsilon 1 gamma 0 if - epsilon 1 < epsilon < + epsilon 1 gamma -a if epsilon < or = epsilon 1 wherein epsilon 1 is of a predetermined amplitude; F. integrating the derivative of setting acceleration signal in accordance with 1/p and within acceleration constraint limits +L and -L to develop a setting acceleration signal gamma e; G. additively comparing the setting acceleration signal gamma e with an actual acceleration signal to develop an initial control signal gamma c; H. and effectively applying the initial control signal to the traction motor to control motor operation.
Claim 4
Independent Claim
211 words
The method of controlling a traction motor, in the operation of a railroad train, rapid tansit train, or like vehicle, comprising the following steps: A. sensing the actual speed of the vehicle to develop an actual speed signal Vs; B. developing a speed setting signal VE; C. modifying the actual speed signal to advance the phase thereof, thus developing a modified actual speed signal; D. additively comparing the signals from steps B and C to develop a selector signal epsilon ; E. differentiating the selector signal epsilon within the constraint limits +a, 0, -a to develop a derivative of setting acceleration signal gamma having values as follows: gamma +a if Delta > or = epsilon 1 gamma 0 if - epsilon 1 < epsilon < + epsilon 1 gamma -a if epsilon < or = epsilon 1 wherein epsilon 1 is of a predetermined amplitude; F. integrating the derivative of setting acceleration signal in accordance with 1/p and within acceleration constraint limits +L and -L to develop a setting acceleration signal gamma e; G. additively comparing the setting acceleration signal gamma e with an actual acceleration signal to develop an initial control signal gamma c; H. and effectively applying the initial control signal to the traction motor to control motor operation.
Claim 5
Dependent Claim
15 words
The method according to claim 1 in Which the speed setting signal VE is discontinuous.
Claim 6
Dependent Claim
15 words
The method according to claim 1 in which the speed setting signal VE is continuous.
Claim 7
Dependent Claim
22 words
The method according to claim 1 in which the speed setting signal VE is a step signal varying between two fixed values.
Claim 8
Dependent Claim
83 words
The method according to claim 1 in which the traction motor is subject to an additional speed setting control, and including the following additional steps: I. integrating the initial control signal gamma c in accordance with 1/p to develop a control speed signal VC which is applied to the traction motor; J. and additively combining the control speed signal VC with the actual speed signal VS, and the positive part of the resulting signal constitutes the actual acceleration signal employed in step G.
Claim 9
Dependent Claim
42 words
The method according to claim 1, including the following additional step: B''. additively comparing the signals VS and VE to develop a speed difference signal; and in which that speed difference signal is employed as the speed setting signal in step D.
Claim 10
Dependent Claim
195 words
A speed control system for controlling a traction motor in a railroad train, rapid transit train, or like vehicle, comprising: sensing means for sensing the actual speed of the vehicle to develop an actual speed signal VS; first additive comparator means for comparing the actual speed signal VS with a speed setting signal VE received from an external source to develop a selector signal epsilon ; differentiating and limiting means for differentiating the selector signal epsilon to generate a derivative of setting acceleration signal gamma within predetermined limits; first integrating means for integrating the signal gamma in accordance with 1/p to generate a setting acceleration signal gamma e; limiting feedback means, coupled to the first integrating means, for limiting the amplitude of the setting acceleration signal gamma e within limits +L and -L; second additive comparator means for comparing the limited setting acceleration signal gamma e with an actual acceleration signal gamma s for the vehicle to generate an initial control signal gamma c; second integrating means for integrating the initial control signal gamma c to develop a speed control signal VC; and means for applying the speed control signal VC to the traction motor.
Claim 11
Dependent Claim
195 words
A speed control system for controlling a traction motor in a railroad train, rapid transit train, or like vehicle, comprising: sensing means for sensing the actual speed of the vehicle to develop an actual speed signal VS; first additive comparator means for comparing the actual speed signal VS with a speed setting signal VE received from an external source to develop a selector signal epsilon ; differentiating and limiting means for differentiating the selector signal epsilon to generate a derivative of setting acceleration signal gamma within predetermined limits; first integrating means for integrating the signal gamma in accordance with 1/p to generate a setting acceleration signal gamma e; limiting feedback means, coupled to the first integrating means, for limiting the amplitude of the setting acceleration signal gamma e within limits +L and -L; second additive comparator means for comparing the limited setting acceleration signal gamma e with an actual acceleration signal gamma s for the vehicle to generate an initial control signal gamma c; second integrating means for integrating the initial control signal gamma c to develop a speed control signal VC; and means for applying the speed control signal VC to the traction motor.
References Cited (Backward Citations)
US3350612A
Cited
US3523232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |