US3962612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for electric vehicle
Assignee: Daihatsu Motor Co Ltd
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Filing: 1974-10-08
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Granted: 1976-06-08
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Expires: 1994-10-08
Abstract
Abstract A control device is disclosed for an electric car employing a DC shunt motor, the armature, of which, is connected to a storage battery through a first relay contact and two series resistors shunted by second and third relay contacts second and third relays are energized in turn depending upon a degree of depression of an accelerator pedal, so that an armature terminal voltage is controlled to a plurality of values which are dependent upon the degree of pedal depression, the shunt field coil is connected through a field current control circuit for continuously controlling the field current depending upon a degree of depression of the accelerator pedal. In a preferred embodiment transistors are connected in series with the relays such that transistors are controlled by threshold values of rotational speed of the armature and/or an armature current. Therefore, the energization of the relays and thus of the switching control of the armature terminal voltage is conditioned by an armature rotational speed and/or an armature current. In another preferred embodiment of the present invention, the abovementioned continuous control of the field current is conditioned by a threshold value of armature rotational speed and/or an armature current. In a further preferred embodiment, the abovementioned switching control of the armature voltage and the abovementioned continuous control of the field current are both conditioned by a threshold value of armature rotational speed and/or an armature current.
Inventors
- 👤 Toshikazu Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:34
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/298; H02P7/2985; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/916
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
166 words
A control device for an electric vehicle comprising: an electrical power source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; and field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil, whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 2
Dependent Claim
166 words
A control device for an electric vehicle comprising: an electrical power source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; and field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil, whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 3
Dependent Claim
64 words
A control device for an electric vehicle in accordance with claim 1, in which said switching control means comprises: a switch controllable in response to said speed adjusting means; a relay connected to be energized in response to control of said switch; and a resistor connected between said armature and said power source, said resistor being shunted by a relay contact of said relay.
Claim 4
Dependent Claim
56 words
A control device for an electric vehicle in accordance with claim 1, in which said field coil current control means comprises: means for on/off controlling a current flowing through said field coil; and means responsive to adjustment of said speed adjusting means for controlling continuously a conduction phase of said current flowing through said field coil.
Claim 5
Dependent Claim
62 words
A control device for an electric vehicle in accordance with claim 3, in which said conduction phase control means comprises: means for generating a saw tooth wave signal; means for threshold detecting said saw tooth wave signal; and means responsive to said speed adjusting means for changing the amplitude of said saw tooth wave signal being detected by said threshold detecting means.
Claim 6
Dependent Claim
29 words
A control device for an electric vehicle in accordance with claim 1, which further comprises: means for providing an electrical signal corresponding to the rotational speed of said motor.
Claim 7
Dependent Claim
37 words
A control device for an electric vehicle in accordance with claim 5, in which said means for providing a rotational speed signal comprises means operatively coupled to said motor for detecting the rotational speed of said motor.
Claim 8
Dependent Claim
32 words
A control device for an electric vehicle in accordance with claim 5, in which said means for providing a rotational speed signal comprises means for detecting the current flowing through said armature.
Claim 9
Dependent Claim
57 words
A control device for an electric vehicle in accordance with claim 5, which further comprises means responsive to said switching control means for controlling said field coil current control means to adjust the field current, thereby preventing a sudden change in armature current at the time said selected armature terminal voltage is changed to another selected value.
Claim 10
Dependent Claim
61 words
A control device for an electric vehicle in accordance with claim 5, which further comprises means responsive to said rotational speed signal for controlling said field coil current control means causing said field current to be a maximum when said rotational speed of said rotational speed of said motor is below a predetermined value, whereby a large starting torque is obtained.
Claim 11
Dependent Claim
42 words
A control device for an electric vehicle in accordance with claim 5, which further comprises means for detecting a current flowing through said shunt field coil, and means responsive to said field coil current detecting means for enabling said switching control means.
Claim 12
Dependent Claim
114 words
A control device for an electric vehicle in accordance with claim 1, which further comprises: means operatively coupled to said motor for detecting the rotational speed of said motor, and providing a rotational speed signal; means for detecting the current flowing through said armature, providing an armature current signal; means responsive to said rotational speed signal for conditioning the response of said switching control means to said speed adjusting means upon said rotational speed signal reaching at least a predetermined value; and means responsive to said armature current signal for conditioning the sensitivity of response of said field current control means to said speed adjusting means upon said armature current reaching a threshold value.
Claim 13
Dependent Claim
44 words
A control device for an electric vehicle in accordance with claim 11, wherein said means responsive to said armature current signal includes means for disabling said switching control means for at least a given time period when said armature current exceeds a threshold value.
Claim 14
Dependent Claim
46 words
A control device for an electric vehicle in accordance with claim 12, wherein said means responsive to said armature current signal includes means for delaying said disabling of said switching control means for a predetermined period of time when said armature current exeeds a threshold value.
Claim 15
Dependent Claim
55 words
A control device for an electric vehicle in accordance with claim 1, in which said switching control means comprises: a resistor connected between said armature and said electrical power source, and a switching device connected in parallel with said resistor, said switching device being controlled with respect to the position of said speed adjusting means.
Claim 16
Dependent Claim
213 words
A control device for an electric vehicle comprising: an electrical power source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; and field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil; means for providing an electrical signal corresponding to the rotational speed of said motor; and means responsive to said rotational speed signal for conditioning the response of said switching control means to said speed adjusting means upon said rotational speed signal reaching at least a threshold value; whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 17
Dependent Claim
213 words
A control device for an electric vehicle comprising: an electrical power source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; and field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil; means for providing an electrical signal corresponding to the rotational speed of said motor; and means responsive to said rotational speed signal for conditioning the response of said switching control means to said speed adjusting means upon said rotational speed signal reaching at least a threshold value; whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 18
Dependent Claim
72 words
A control device for an electric vehicle in accordance with claim 15, in which said conditioning means comprises: a threshold detecting means responsive to said rotational speed signal for threshold detecting said speed signal at a predetermined threshold value and providing an output thereof; and a switching device responsive to said threshold detected output from said threshold detecting means for allowing said switching control means to respond to said speed adjusting means.
Claim 19
Dependent Claim
49 words
A control device for an electric vehicle in accordance with claim 15, which further comprises means responsive to said rotational speed signal for conditioning the response of said field coil current control means to said speed adjusting means upon said rotational speed signal reaching at least a predetermined value.
Claim 20
Dependent Claim
65 words
A control device for an electric vehicle in accordance with claim 15 wherein said field current control means includes: variable impedance means responsive to said speed adjusting means and said rotational speed signal, whereby said rotational speed signal changes the impedance of said variable impedance means to thereby control the sensitivity of response to said field coil current control means to said speed adjusting means.
Claim 21
Dependent Claim
214 words
A control device for an electric vehicle comprising: an electrical power source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil; means for providing an electrical signal corresponding to the rotational speed of said motor; and means responsive to said rotational speed signal for conditioning the response of said field coil current control means to said speed adjusting means upon said rotational speed signal reaching at least a threshold value; whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 22
Dependent Claim
214 words
A control device for an electric vehicle comprising: an electrical power source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil; means for providing an electrical signal corresponding to the rotational speed of said motor; and means responsive to said rotational speed signal for conditioning the response of said field coil current control means to said speed adjusting means upon said rotational speed signal reaching at least a threshold value; whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 23
Dependent Claim
68 words
A control device for an electric vehicle in accordance with claim 19, in which said conditioning means comprises: threshold detecting means responsive to said rotational speed signal for threshold detecting said speed signal at a predetermined threshold value; and means responsive to said output from said threshold detecting means for controlling the sensitivity of the response of said field coil current control means to said speed adjusting means.
Claim 24
Dependent Claim
216 words
A control device for an electric vehicle comprising: power electrical powe source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil; means for providing an electrical signal corresponding to the rotational speed of said motor; and means responsive to said rotational speed signal for maintaining a current in said shunt field coil when said speed adjusting means is adjusted to said start position and the speed of said motor is relatively high; whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 25
Dependent Claim
216 words
A control device for an electric vehicle comprising: power electrical powe source; a DC shunt or compound motor for driving said electric vehicle, said motor comprising an armature and a shunt field coil being connected so as to be energized by said electrical power source; means for adjusting the rotational speed of said motor, wherein said means for adjusting has a range of positions and is continuously adjustable from a start position to positions throughout its range; switching control means responsive to said speed adjusting means for selectively applying values of armature terminal voltage to said armature; field coil current control means responsive to said speed adjusting means throughout said range for continuously controlling the current flowing through said shunt field coil; means for providing an electrical signal corresponding to the rotational speed of said motor; and means responsive to said rotational speed signal for maintaining a current in said shunt field coil when said speed adjusting means is adjusted to said start position and the speed of said motor is relatively high; whereby the rotational speed of said motor is controlled to a value determined by the applied armature terminal voltage selected by said switching control means and the current flowing through said shunt field coil continuously controlled by said field coil current control means.
Claim 26
Dependent Claim
63 words
A control device for an electric vehicle in accordance with claim 21, in which said maintaining means comprises means responsive to said rotational speed signal for keeping said field coil current control means energized for maintaining said current in said shunt field coil when said speed adjusting means is adjusted to said start position and the speed of said motor is relatively high.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |