US3872367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric car controlling device
Assignee: Hitachi Ltd
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Filing: 1973-08-17
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Granted: 1975-03-18
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Expires: 1993-08-17
Abstract
Abstract A controlling device for an electric car in which comprises a main closed circuit including a battery, a thyristor chopper circuit and a series-wound electric motor, and means for controlling the commutation rate of the thyristor chopper circuit for control of an output torque from the direct current electric motor wherein said device is provided with a maximum current limiting circuit for detecting a load current of the thyristor chopper circuit and acting on the latter, the limiting circuit having a maximum set value in dependence on an accelerator instruction during plugging.
Inventors
- 👤 Sigeru Kuriyama
- 👤 Hideyuki Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:33
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/02; B60L15/08; H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
An electric car controlling device comprising a seriesconnected circuit including a direct current power supply, a semiconductor chopper circuit, a direct current electric motor circuit including a field circuit and an armature circuit of a direct current electric motor and means for changing over the polarity of said armature in said direct current electric motor relative to that of said field thereof, and a current detecting circuit; a plugging diode circuit including said current detecting circuit and arranged in opposite polarity relative to a power supply voltage for providing a parallel circuit to said armature; and circuit means for controlling the conduction and cutting off of said semiconductor chopper circuit, said circuit means including a current controller for acting on said semiconductor chopper circuit so as to confine current within a predetermined region in dependence on the current detected by said current detecting circuit, and a plugging current control circuit responsive to the output of said chopper circuit and the output current of said current detecting circuit for changing said predetermined region upon detecting the state of plugging, said plugging current control circuit including circuit means for amplifying the output current of said current detecting circuit.
Claim 2
Dependent Claim
196 words
An electric car controlling device comprising a seriesconnected circuit including a direct current power supply, a semiconductor chopper circuit, a direct current electric motor circuit including a field circuit and an armature circuit of a direct current electric motor and means for changing over the polarity of said armature in said direct current electric motor relative to that of said field thereof, and a current detecting circuit; a plugging diode circuit including said current detecting circuit and arranged in opposite polarity relative to a power supply voltage for providing a parallel circuit to said armature; and circuit means for controlling the conduction and cutting off of said semiconductor chopper circuit, said circuit means including a current controller for acting on said semiconductor chopper circuit so as to confine current within a predetermined region in dependence on the current detected by said current detecting circuit, and a plugging current control circuit responsive to the output of said chopper circuit and the output current of said current detecting circuit for changing said predetermined region upon detecting the state of plugging, said plugging current control circuit including circuit means for amplifying the output current of said current detecting circuit.
Claim 3
Dependent Claim
30 words
An electric car controlling device as set forth in claim 1, wherein said predetermined region in said current controller varies with an instruction from an accelerator in said plugging state.
Claim 4
Dependent Claim
145 words
An electric car controlling device as set forth in claim 1, wherein said circuit means for controlling the conductiOn and cutting off of said semi-conductor chopper circuit comprises an oscillating circuit for instructing the conduction and cutting off of said semiconductor chopper circuit in response to the instruction from the accelerator, a maximum current limiting circuit acting on said oscillating circuit and operative to cut off said semiconductor chopper circuit upon detection of a predetermined maximum current by said current detecting circuit, a minimum current limiting circuit acting on said oscillating circuit to prevent said semiconductor chopper circuit from being rendered conductive until said current detecting circuit detects a minimum current in dependence on the instruction from the accelerator, said plugging current control circuit for rendering said minimum current limiting circuit active only upon detection of the plugging state of said direct current electric motor.
Claim 5
Dependent Claim
52 words
An electric car controlling device as set forth in claim 1, further comprising a free-wheel diode whose anode is connected to the junction between said current detecting circuit and said direct current motor circuit and whose cathode is connected to the junction between said chopper circuit and said direct current motor circuit.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |