US4065975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the slip of locomotive wheels and preventing sliding thereof
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1976-06-14
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Granted: 1978-01-03
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Expires: 1996-06-14
Abstract
Abstract Apparatus provided for measuring slippage of locomotive wheels and for preventing excessive sliding of the wheels and which produces a control signal for governing the locomotive speed uses as a basic criteria the variation in velocity between the translatory speed of the locomotive and the circumferential velocity of sliding wheels. Variation in velocity is measured by integrating acceleration differences between the effective acceleration of the locomotive and the wheel acceleration.
Inventors
- 👤 Jean Giessner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:25
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; G; G01; G01P; G01P15/00; G01P3/00; G01P3/42; G01P3/56; G01P7/00; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/72
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
280 words
Apparatus for measuring wheel slip and to prevent excessive sliding of the wheels of a locomotive and which produces a control signal in accordance with the variation in velocity between translatory speed of the locomotive and the circumferential velocity of sliding sheels, said control signal being used for governing the speed of the locomotive, said apparatus comprising: a system including a coupling loop for determining the effective acceleration of the locomotive, said system comprising a comparator into one input of which is fed a signal corresponding to the acceleration of a wheel and wherein the output signal from said system is fed back to the other input of said comparator and wherein the following seriately connected circuit components are included between said comparator and the output of said system. 1. a switch which opens only in the event of wheel slip, 2. an integrator with output storage, 3. a multiplier having one input thereof connected to the output store of said integrator and to the other input of which is connected a signal derived from the locomotive motor current and which is proportional to its pulling force, said system being in balance when said switch is in its closed state and which is indicative of an effective acceleration of the locomotive equal to that of the wheel acceleration, means for integrating the difference between a signal representing the output from said system by which the effective acceleration of the locomotive is obtained and a signal representative of wheel acceleration to produce said control signal for governing the speed of the locomotive, and means for blocking transmission of said difference signal to said integrating means in the absence of wheel slip.
Claim 2
Dependent Claim
280 words
Apparatus for measuring wheel slip and to prevent excessive sliding of the wheels of a locomotive and which produces a control signal in accordance with the variation in velocity between translatory speed of the locomotive and the circumferential velocity of sliding sheels, said control signal being used for governing the speed of the locomotive, said apparatus comprising: a system including a coupling loop for determining the effective acceleration of the locomotive, said system comprising a comparator into one input of which is fed a signal corresponding to the acceleration of a wheel and wherein the output signal from said system is fed back to the other input of said comparator and wherein the following seriately connected circuit components are included between said comparator and the output of said system. 1. a switch which opens only in the event of wheel slip, 2. an integrator with output storage, 3. a multiplier having one input thereof connected to the output store of said integrator and to the other input of which is connected a signal derived from the locomotive motor current and which is proportional to its pulling force, said system being in balance when said switch is in its closed state and which is indicative of an effective acceleration of the locomotive equal to that of the wheel acceleration, means for integrating the difference between a signal representing the output from said system by which the effective acceleration of the locomotive is obtained and a signal representative of wheel acceleration to produce said control signal for governing the speed of the locomotive, and means for blocking transmission of said difference signal to said integrating means in the absence of wheel slip.
Claim 3
Dependent Claim
78 words
Apparatus as defined in claim 1 wherein said means for blocking transmission of said difference signal to said integrating means in the absence of wheel slip includes means for obtaining the second derivative of the wheel velocity and a flip-flop circuit actuated by said second derivative to a state in which it remains set for a time sufficient to permit the variation in wheel velocity to assume its proper value in a case where wheel slip is present.
Claim 4
Dependent Claim
34 words
Apparatus as defined in claim 2 wherein said flip-flop circuit actuated by said second derivative of the wheel velocity is maintained in said set state by the first derivative of the wheel velocity variation.
Claim 5
Dependent Claim
102 words
Apparatus as defined in claim 3 for maintaining said flip-flop circuit in said set state by the first derivative of the variation in wheel velocity comprising an OR-gate having its output connected to the input side of said flip-flop circuit, one input to said OR-gate being constituted by the first derivative of the variation in wheel velocity and the other input to said OR-gate being constituted by the output from an AND-gate, one input to said AND-gate being constituted by the second derivative of the wheel velocity and other input thereto being inverted and constituted by the output from said flip-flop circuit.
Claim 6
Dependent Claim
39 words
Apparatus as defined in claim 1 and which further includes means introducing into said coupling loop a negative acceleration signal which is a function of speed of the locomotive for taking into consideration any resistance opposing its forward movement.
Claim 7
Dependent Claim
166 words
Apparatus as defined in claim 1 and which further includes a second switch connected between the first mentioned switch and the input to said integrator, an adder component having as one input thereto the output from said multiplier and as the other input thereto the output from a second integrator, the input to said second integrator being connected by way of a third switch to a junction point in the circuit between said first mentioned and second switches, said second and third switches being jointly controlled by a change in the locomotive pulling force such that one of said two switches is open while the other one is closed and vice versa, the output from said adder component being fed back as a second and negative input to said comparator and also constituting the effective acceleration of the locomotive equal to the sum of primary acceleration caused by the pulling force exerted on the true mass and a supplemental gravity induced positive or negative acceleration component.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |