US3891902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control unit for electric vehicles
Assignee: General Electric Co
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Filing: 1973-12-03
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Granted: 1975-06-24
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Expires: 1993-12-03
Abstract
Abstract An improved speed control unit for governing the operation of electric vehicles utilizing pulse-type control systems. A Hall generator is coupled to a manually operated lever, and rotated within a defined range to produce a voltage proportional to the angular displacement of the lever. Circuitry is provided for shaping the generator output in a desired manner and for controlling the mark-space ratio of a thyristor in response thereto.
Inventors
- 👤 Charles Edward Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:25
CPC Classifications
B; B60; B60L; B60L9/00; B60L15/00; B60L15/20; B60L15/30; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
Speed controlling means for a vehicle powered by an electric traction motor coupled to a source of d.c. potential comprising: magnetic means for producing a magnetic field in a predetermined location; Hall effect means disposed in the field produced by said magnetic means; a first pair of electrodes coupled to the Hall effect means for providing a current path to a source of d.c. potential; a second pair of electrodes coupled to said Hall effect means for receiving an output voltage which varies as a function of position of said Hall effect means; manually operable means for rotating said Hall effect means with respect to said magnetic means; a thyristor for coupling the d.c. traction motor to the d.c. source; thyristor control means for varying the mark-space ratio of the thyristor as a function of an applied control voltage; and a shaping circuit for producing an output voltage whose rate of change increases with an increasing input voltage for coupling said second pair of electrodes to said thyristor control means.
Claim 2
Dependent Claim
170 words
Speed controlling means for a vehicle powered by an electric traction motor coupled to a source of d.c. potential comprising: magnetic means for producing a magnetic field in a predetermined location; Hall effect means disposed in the field produced by said magnetic means; a first pair of electrodes coupled to the Hall effect means for providing a current path to a source of d.c. potential; a second pair of electrodes coupled to said Hall effect means for receiving an output voltage which varies as a function of position of said Hall effect means; manually operable means for rotating said Hall effect means with respect to said magnetic means; a thyristor for coupling the d.c. traction motor to the d.c. source; thyristor control means for varying the mark-space ratio of the thyristor as a function of an applied control voltage; and a shaping circuit for producing an output voltage whose rate of change increases with an increasing input voltage for coupling said second pair of electrodes to said thyristor control means.
Claim 3
Dependent Claim
19 words
The invention defined in claim 1, wherein said output voltage varies substantially as the square of said input voltage.
Claim 4
Dependent Claim
144 words
In an electric vehicle, speed control means for varying the mark-space ratio of a thyristor coupling a traction motor to a source of d.c. potential, comprising: a Hall effect generator; manually operable means for rotating said Hall effect generator to produce an output voltage proportional to the angle of rotation, wherein the total rotation of said manually operable means is limited to cause said Hall effect generator to produce a signal which varies substantially linearly with rotation of said manually operable means; thyristor control means coupled to the thyristor and adapted to control the rate of conduction of said thyristor in response to a signal voltage; and circuit means for coupling the output voltage of said Hall effect generator to said thyristor control means whereby the mark-space ratio of said thyristor varies as a predetermined function of the operation of said manually operable means.
Claim 5
Dependent Claim
144 words
In an electric vehicle, speed control means for varying the mark-space ratio of a thyristor coupling a traction motor to a source of d.c. potential, comprising: a Hall effect generator; manually operable means for rotating said Hall effect generator to produce an output voltage proportional to the angle of rotation, wherein the total rotation of said manually operable means is limited to cause said Hall effect generator to produce a signal which varies substantially linearly with rotation of said manually operable means; thyristor control means coupled to the thyristor and adapted to control the rate of conduction of said thyristor in response to a signal voltage; and circuit means for coupling the output voltage of said Hall effect generator to said thyristor control means whereby the mark-space ratio of said thyristor varies as a predetermined function of the operation of said manually operable means.
Claim 6
Dependent Claim
25 words
The invention defined in claim 3, wherein said circuit means comprises shaping circuitry for producing a substantially square law response to a linearly changing signal.
Claim 7
Dependent Claim
20 words
The invention defined in claim 4, wherein said thyristor control means comprises means for gating and for commutating said thyristor.
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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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |