Patent US3748564A successfully refreshed from Google Patents.
US3748564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control circuit
Assignee: Individual
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Filing: 1972-07-07
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Granted: 1973-07-24
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Expires: 1992-07-07
Abstract
Abstract A remote-controlled vehicle has left and right driving wheels independently propelled by a pair of DC electric motors, with the vehicle being responsive to a control signal transmitted by a portable transmitter carried by a moving individual for transporting a load at a predetermined distance behind said individual. The vehicle has an improved electronic control system comprising a receiver for receiving the transmitted control signal and developing therefrom a range signal representative of the distance between the individual and the vehicle and a bearing signal representative of the heading of the vehicle relative to said individual. A DC amplifier circuit converts the bearing and range signals to left and right DC control signals. An astable multivibrator generates a pair of fixed-frequency pulse-train signals which are each converted to trapezoidal pulse-train signals by an integrating circuit. The left and right DC control signals are combined with the trapezoidal pulse-train signals and are applied to a threshold switching circuit which develops a variable-width rectangular pulse-train signal which is applied to the motor.
Inventors
- 👤 S Ohba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:30
CPC Classifications
A; A63; A63B; A63B55/00; A63B55/60; A63B55/61; B; B62; B62B; B62B2202/00; B62B2202/40; B62B2202/404
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
In a remote-controlled vehicle having left and right driving wheels independently propelled by a pair of DC electric motors, said vehicle responsive to a control signal transmitted by a portable transmitter carried by a moving individual for transporting a load at a predetermined distance behind said individual, an improved electronic control system comprising: means for receiving said transmitted control signal and developing therefrom a range signal representative of the distance between said individual and said vehicle and a bearing signal representative of the heading of said vehicle relative to said individual; means responsive to said range and bearing signals for generating respective left and right pulse-train electrical signals each comprising a series of pulses having a pulse width and polarity that systematically vary in accordance with the range and bearing signals; and means for applying said left pulse-train electrical signal to the motor propelling said left driving wheel and said right pulse-train electrical signal to the motor propelling said right driving wheel.
Claim 2
Dependent Claim
162 words
In a remote-controlled vehicle having left and right driving wheels independently propelled by a pair of DC electric motors, said vehicle responsive to a control signal transmitted by a portable transmitter carried by a moving individual for transporting a load at a predetermined distance behind said individual, an improved electronic control system comprising: means for receiving said transmitted control signal and developing therefrom a range signal representative of the distance between said individual and said vehicle and a bearing signal representative of the heading of said vehicle relative to said individual; means responsive to said range and bearing signals for generating respective left and right pulse-train electrical signals each comprising a series of pulses having a pulse width and polarity that systematically vary in accordance with the range and bearing signals; and means for applying said left pulse-train electrical signal to the motor propelling said left driving wheel and said right pulse-train electrical signal to the motor propelling said right driving wheel.
Claim 3
Dependent Claim
82 words
A system according to claim 1, which further comprises means responsive to said range and bearing signals For developing a left DC control signal and a right DC control signal, and said generating means is responsive to said left and right DC control signal for generating said respective left and right pulse-train signals each comprising a series of rectangular pulses having a pulse width and polarity that systematically vary in accordance with the amplitude and polarity of the corresponding DC control signal.
Claim 4
Dependent Claim
59 words
A system according to claim 2, in which said generating means comprises means for generating a pair of trapezoidal pulse-train signals having DC voltage levels that systematically vary in accordance with said left and right DC control signals, respectively, and a threshold switching means responsive to a predetermined threshold switching voltage for generating said left and right pulse-train signals.
Claim 5
Dependent Claim
48 words
A system according to claim 3, in which said trapezoidal pulse-train generating means comprises an astable multivibrator for generating a pair of rectangular pulse-train signals, and a pair of integrating circuits coupled to said multivibrator for converting said rectangular pulse-train signals into said pair of trapezoidal pulse-train signals.
Claim 6
Dependent Claim
50 words
A system according to claim 2, which further comprises a pair of feedback control circuits coupled from said motors to said generating means for applying a DC signal to said generating means representative of the operating characteristics of the respective one of said motors, thereby providing improved motor speed control.
Claim 7
Dependent Claim
17 words
A system according to claim 5, in which each said feedback control circuit comprises an integrating 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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |