US3663875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for electric vehicles
Assignee: Mitsubishi Electric Corp
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Filing: 1970-01-26
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Granted: 1972-05-16
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Expires: 1990-01-26
Abstract
Abstract Four DC traction motors are serially connected to one another and divided into two groups. Upon the occurrence of a slip, a difference between voltages across the two motor groups is detected and applied to a current regulator along with a current flowing through the motors and a current pattern for normally determining that current. Then a magnitude of current fed back to the motor current is determined and the motor current decreases until the slip terminates. After the slip has terminated, the normal operation is performed.
Inventors
- 👤 Masahiro Ashiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:56
CPC Classifications
B; B60; B60L; B60L3/00; B60L3/10; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
232 words
A control system for use with a train of electric vehicles comprising, in combination, a plurality of direct current traction motors serially connected to one another and divided into two motor groups, one detection means operatively coupled to each of said two motor groups to detect a voltage developed across that motor group, comparison means connected to said detecTion means to compare an output from one of said detection means with that from the other detection means, thereby to produce an output in the form of a predetermined function in accordance with a difference between the compared outputs, a current detector means for detecting a current flowing through said traction motors, a current pattern control means for determining the normal current flowing through the traction motors, power converter means connected in series with said traction motors to control the current flowing through said traction motors, and adjusting means having the output from said comparison means, the output from said current detector means and said current pattern applied as inputs thereto, said adjusting means being operative normally to control said power converter means in accordance with said current pattern, and being responsive to the occurrence of a slip between said traction motors to control said power converter means so as to cause said adjusting means to decrease the current flowing through said traction motors in accordance with the output from said comparison means.
Claim 2
Dependent Claim
232 words
A control system for use with a train of electric vehicles comprising, in combination, a plurality of direct current traction motors serially connected to one another and divided into two motor groups, one detection means operatively coupled to each of said two motor groups to detect a voltage developed across that motor group, comparison means connected to said detecTion means to compare an output from one of said detection means with that from the other detection means, thereby to produce an output in the form of a predetermined function in accordance with a difference between the compared outputs, a current detector means for detecting a current flowing through said traction motors, a current pattern control means for determining the normal current flowing through the traction motors, power converter means connected in series with said traction motors to control the current flowing through said traction motors, and adjusting means having the output from said comparison means, the output from said current detector means and said current pattern applied as inputs thereto, said adjusting means being operative normally to control said power converter means in accordance with said current pattern, and being responsive to the occurrence of a slip between said traction motors to control said power converter means so as to cause said adjusting means to decrease the current flowing through said traction motors in accordance with the output from said comparison means.
Claim 3
Dependent Claim
48 words
A control system according to claim 1, in which said detection means comprises a voltage detector connected across each said motor group and said comparison means comprises a comparison amplifier having input leads connected respectively to said voltage detectors and an output lead connected to said adjusting means.
Claim 4
Dependent Claim
60 words
A control system according to claim 1, in which said detection means comprises two resistors connected in series with one another across said two groups of motors to constitute a Wheatstone bridge and said comparison means comprises differential voltage detector means having one input lead connected between said groups of motors and a second input lead connected between said resistors.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |