Patent US3743900A successfully refreshed from Google Patents.
US3743900A
Expired / Lapsed
US
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Supplemental wheel-slip control system
Assignee: General Electric Co
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Filing: 1972-03-21
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Granted: 1973-07-03
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Expires: 1992-03-21
Abstract
Abstract A supplemental system for rapid response, wheel-slip control of a traction vehicle. A reduction in the motor armature current, brought about by the acceleration of a traction motor driving a pair of slipping wheels, generates a signal which is used to temporarily reduce power to the motor and prevent further slippage. Since the motor currents are high at low speeds, the sensitivity is greatest, and rapid correction response is obtained at low vehicle speeds. At higher speeds, the motor current is less, and a supplemental system is desirable.
Inventors
- 👤 A Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:30
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
A supplemental wheel slip control system for use at low speeds on a traction vehicle of the type having a traction motor driving a wheeled axle and being powered by voltage generation means having excitation control means, said system comprising: a. a d-c motor whose armature current varies inversely with armature speed; b. a rate transformer having a secondary coil and a primary coil, said primary coil being serially connected in the circuit of said armature so as to be responsive to change in armature current of said traction motor; and c. a transistor whose gate is connected to the output of said secondary coil and whose collector emitter completes an impedance bleed-off circuit in parallel connection with said excitation control circuit; whereby when the speed of said wheeled axle rapidly increases the corresponding reduction in motor armature current causes said transistor to conduct and bleed off current from said excitation means to reduce the current from the voltage generation means, and hence the speed of the traction motor, until said transistor ceases to conduct at the cessation of motor armature current reduction.
Claim 2
Dependent Claim
183 words
A supplemental wheel slip control system for use at low speeds on a traction vehicle of the type having a traction motor driving a wheeled axle and being powered by voltage generation means having excitation control means, said system comprising: a. a d-c motor whose armature current varies inversely with armature speed; b. a rate transformer having a secondary coil and a primary coil, said primary coil being serially connected in the circuit of said armature so as to be responsive to change in armature current of said traction motor; and c. a transistor whose gate is connected to the output of said secondary coil and whose collector emitter completes an impedance bleed-off circuit in parallel connection with said excitation control circuit; whereby when the speed of said wheeled axle rapidly increases the corresponding reduction in motor armature current causes said transistor to conduct and bleed off current from said excitation means to reduce the current from the voltage generation means, and hence the speed of the traction motor, until said transistor ceases to conduct at the cessation of motor armature current reduction.
Claim 3
Dependent Claim
42 words
A supplemental wheel slip control system as set forth in claim 1 and including a capacitor and an impedance shunting said collector-emitter so as to provide a gradual reduction of current flow in the bleed-off circuit when the transistor ceases to conduct.
Claim 4
Dependent Claim
46 words
A supplemental wheel slip control system as set forth in claim 1 wherein a plurality of rate transformers are applied to a plurality of parallel motor circuits with the primary coil of each of said rate transformers connected serially in one of said parallel motor circuits.
Claim 5
Dependent Claim
30 words
A supplemental wheel slip control system as set forth in claim 3 wherein the secondary coils of said plurality of rate transformers are connected in parallel to a single transistor.
Claim 6
Dependent Claim
32 words
A supplemental wheel slip control system as set forth in claim 4 and including rectifier means connected to said secondary coils to prevent the outputs thereof from being dissipated to each other.
Claim 7
Dependent Claim
56 words
A supplemental wheel slip system as set forth in claim 1 wherein said excitation control means comprises an exciter whose output provides field current to the voltage generation means and whose own field is connected in series with a power source and the collector-emitter of a field transistor whose gate is connected to a modulation circuit.
Claim 8
Dependent Claim
59 words
A supplemental wheel slip system as set forth in claim 6 wherein said modulation circuit comprises a pulse width mOdulator whose a-c winding is connected to the field transistor gate and whose d-c winding receives an output signal from a comparison circuit having a reference current input, said reference current input being connected in parallel with said bleed-off circuit.
References Cited (Backward Citations)
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |