US4095147A
Expired / Lapsed
US
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Wheel slip correction method, system and apparatus
Assignee: Individual
•
Filing: 1976-02-26
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Granted: 1978-06-13
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Expires: 1996-02-26
Abstract
Abstract The following specification described a method or system of correcting locomotive wheel slip in which each driven wheel provides a wheel velocity signal proportional to its angular velocity. This signal is compared in a wheel slip detection circuit for each wheel with a train speed signal to derive a signal corresponding to the difference in the event of wheel slip. This difference signal is differentiated to provide a signal corresponding to the acceleration and multiplied by a signal corresponding to the slipping wheel speed to provide a correction signal corresponding to the power lost in the slipping wheel. The wheel velocity signals are compared in a "less than" and a "greater than" circuit respectively to derive the train speed signal and the slipping wheel signal. The correction signal is utilized for controlling the current in the field windings of the main generator of a diesel electric locomotive to reduce the power by a factor corresponding to the power lost in the wheel slip and to initiate the application of sand to the track in the event the train speed is low or the slip is repetitive. An override relay is also operated by the correction signal to control the conventional override solenoid to reduce the generator output and thereby enable the governor to reduce the engine fuel supply. The correction signal is also used for controlling the storage of the train speed signal to retain a record or memory of the train speed so that the correction signal is always properly derived irrespective of the number of slipping wheels.
Inventors
- 👤 John M. Mountz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:01
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L3/106; B60L3/102; B60L50/00; B60L50/10; B60L2200/00; B60L2200/26; B60L2220/00; B60L2220/10; B60L2220/20; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y02T10/7072
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
133 words
An improved system for correcting wheel slip between any one of a plurality of locomotive wheels and a track occurring in response to the application of power to said wheels for rotating said wheels along a track to move the locomotive relative said track, the improvement comprising: means common to said wheels for deriving a first signal proportional to locomotive speed; means controlled by said first signal for deriving a respective correction signal for each wheel proportional to the power dissipated by the respective wheel in response to a slip condition of the respective wheel; means for utilizing each correction signal for controlling the slip condition of the respective wheel to eliminate the slip; and memory means operated by said correction signal for retaining said first signal until said slip condition is eliminated.
Claim 2
Dependent Claim
133 words
An improved system for correcting wheel slip between any one of a plurality of locomotive wheels and a track occurring in response to the application of power to said wheels for rotating said wheels along a track to move the locomotive relative said track, the improvement comprising: means common to said wheels for deriving a first signal proportional to locomotive speed; means controlled by said first signal for deriving a respective correction signal for each wheel proportional to the power dissipated by the respective wheel in response to a slip condition of the respective wheel; means for utilizing each correction signal for controlling the slip condition of the respective wheel to eliminate the slip; and memory means operated by said correction signal for retaining said first signal until said slip condition is eliminated.
Claim 3
Dependent Claim
27 words
The system claimed in claim 1 in which each correction signal is independent of a correction signal generated in response to a slip condition of another wheel.
Claim 4
Dependent Claim
99 words
An improved method for correcting wheel slip occurring in response to the application of power to a vehicle wheel for rotating said vehicle wheel along a surface engaged with said wheel to move the vehicle synchronously with said wheel relative said surface, the improvement comprising the steps of: deriving the power loss of the slipping wheel, said power loss comprising the power to a wheel's axle minus the power used in tractive effort; producing a control signal representing said power loss; and utilizing said control signal to control the power applied to the vehicle, for correcting the wheel slip.
Claim 5
Dependent Claim
99 words
An improved method for correcting wheel slip occurring in response to the application of power to a vehicle wheel for rotating said vehicle wheel along a surface engaged with said wheel to move the vehicle synchronously with said wheel relative said surface, the improvement comprising the steps of: deriving the power loss of the slipping wheel, said power loss comprising the power to a wheel's axle minus the power used in tractive effort; producing a control signal representing said power loss; and utilizing said control signal to control the power applied to the vehicle, for correcting the wheel slip.
Claim 6
Dependent Claim
54 words
The method of claim 3 wherein the step of deriving the power loss includes the steps of: deriving the speed of the axle; deriving the acceleration of the axle from the speed thereof; and multiplying the speed of the axle times the acceleration of the axle times the moment of inertia of the axle.
Claim 7
Dependent Claim
42 words
The method of claim 3 wherein the vehicle has a main power generator control system and the step of utilizing said control signal comprises the step of applying said control signal to said main power generator to reduce the power output therefrom.
Claim 8
Dependent Claim
29 words
The method of claim 3 wherein said wheel slip occurs as a result of the application of power to a vehicle wheel in an effort to accelerate the vehicle.
Claim 9
Dependent Claim
29 words
The method of claim 3 wherein said wheel slip occurs as a result of the application of power to a vehicle wheel in an effort to decelerate the vehicle.
Claim 10
Dependent Claim
19 words
The method of claim 3 wherein the step of deriving the power loss of the slipping wheel is continuous.
Claim 11
Dependent Claim
23 words
The method of claim 3 wherein the step of utilizing said control signal to control the power applied to the vehicle occurs automatically.
Claim 12
Dependent Claim
23 words
The method of claim 4 including the step of storing a signal corresponding to the speed of an axle which is not slipping.
Claim 13
Dependent Claim
35 words
The method of claim 3 including the step of applying a material such as sand to increase the friction between the wheel and the surface engaged with said wheel in response to the control signal.
Claim 14
Dependent Claim
22 words
The method of claim 4 wherein the moment of inertia is adjustable to correspond with the moment of inertia of different vehicles.
Claim 15
Independent Claim
102 words
A system for correcting wheel slip occurring in response to the application of power to a vehicle wheel for rotating said vehicle wheel along a surface engaged with said wheel to move the vehicle synchronously with said wheel relative said surface, the improvement comprising: means for deriving the power loss of the slipping wheel, said power loss being the power to a wheel's axle minus the power used in tractive effort; means to produce a control signal representative of said power loss; and means for utilizing said control signal to control the power applied to the vehicle, for correcting the wheel slip.
Claim 16
Independent Claim
102 words
A system for correcting wheel slip occurring in response to the application of power to a vehicle wheel for rotating said vehicle wheel along a surface engaged with said wheel to move the vehicle synchronously with said wheel relative said surface, the improvement comprising: means for deriving the power loss of the slipping wheel, said power loss being the power to a wheel's axle minus the power used in tractive effort; means to produce a control signal representative of said power loss; and means for utilizing said control signal to control the power applied to the vehicle, for correcting the wheel slip.
Claim 17
Dependent Claim
50 words
The invention of claim 13 wherein the means for deriving the power loss comprises means for determining axle speed; means for deriving the axle's acceleration from said axle's speed; and means for multiplying axle speed times axle acceleration times the axle's moment of inertia, the resulting output representing power loss.
Claim 18
Dependent Claim
41 words
The invention of claim 13 wherein said means utilizing the control signal to control the power applied to the vehicle comprises control circuitry which proportionately increases or decreases the power being applied to the vehicle in response to said control signal.
Claim 19
Dependent Claim
20 words
The invention of claim 14 further comprising memory means for retaining the axle speed until the slip condition is eliminated.
Claim 20
Dependent Claim
35 words
The invention of claim 13 further comprising means for applying a material such as sand to increase the friction between the wheel and the surface engaged with said wheel in response to said control signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |