US3713504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle electric drive providing regulation of drive wheel operating speed difference
Assignee: Motors Liquidation Co
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Filing: 1971-05-26
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Granted: 1973-01-30
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Expires: 1991-05-26
Abstract
Abstract A vehicle electric drive system includes two electric power supplies connected respectively to energize front and rear drive AC induction motors to propel front and rear sets of drive wheels through respective front and rear differentials. The AC voltages supplied the motors are comprised of substantially rectangular voltage pulses of alternating polarity. The operating speeds of the two motors are sensed and compared to ascertain whether the difference in operating speeds exceeds a predetermined amount. If the sensed operating speed difference is in excess of a predetermined value, the width of the voltage pulses supplied the motor operating at the higher speed is reduced to reduce the level of the voltage supplied that motor, thus reducing its speed to ensure that the front and rear sets of drive wheels are operated with a controlled maximum speed difference.
Inventors
- 👤 D Shimer
- 👤 J Salihi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:21
CPC Classifications
B; B60; B60W; B60W20/00; B60K; B60K17/00; B60K17/34; B60K17/356; B60K6/00; B60K6/20; B60K6/42; B60K6/46; B60K6/50; B60K6/52; B60L; B60L50/00; B60L50/10; B60L50/13; B60W10/00; B60W10/04; B60W10/08; B60L2210/00; B60L2210/20; B60W2720/00; B60W2720/40; B60W2720/403; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/62; Y02T10/70; Y02T10/7072; Y02T10/72; Y10; Y10S; Y10S903/00; Y10S903/902; Y10S903/903; Y10S903/904; Y10S903/915; Y10S903/916
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
A vehicle electric drive including a prime mover driven alternator supplying first and second AC to AC controlled rectifier frequency changers, comprising: front and rear sets of drive wheels, front and rear AC induction drive motors, front and rear differentials coupling said front and rear drive wheels respectively with said front and rear drive motors, means connecting said drive motors for energization respectively by said frequency changers, first and second slip speed control means connected respectively with said frequency changers and said motors to control frequency changer operating frequency and motor slip frequency, first and second sensing means coupled with said front and rear motors to continually sense motor operating speed, first and second voltage control means connected with both said first and second sensing means and respectively with said first and second frequency changers to reduce the voltage level of a respective frequency changer if the operating speed of the motor connected with said respective frequency changer exceeds by a predetermined amount the operating speed of the other motor to effect regulation of the difference in operating speeds of said front and rear sets of drive wheels.
Claim 2
Dependent Claim
188 words
A vehicle electric drive including a prime mover driven alternator supplying first and second AC to AC controlled rectifier frequency changers, comprising: front and rear sets of drive wheels, front and rear AC induction drive motors, front and rear differentials coupling said front and rear drive wheels respectively with said front and rear drive motors, means connecting said drive motors for energization respectively by said frequency changers, first and second slip speed control means connected respectively with said frequency changers and said motors to control frequency changer operating frequency and motor slip frequency, first and second sensing means coupled with said front and rear motors to continually sense motor operating speed, first and second voltage control means connected with both said first and second sensing means and respectively with said first and second frequency changers to reduce the voltage level of a respective frequency changer if the operating speed of the motor connected with said respective frequency changer exceeds by a predetermined amount the operating speed of the other motor to effect regulation of the difference in operating speeds of said front and rear sets of drive wheels.
Claim 3
Dependent Claim
188 words
A vehicle electric drive including a prime mover driven alternator supplying first and second AC to AC controlled rectifier frequency changers, comprising: front and rear sets of drive wheels, front and rear AC induction drive motors, front and rear differentials coupling said front and rear drive wheels respectively with said front and rear drive motors, means connecting said drive motors for energization respectively by said frequency changers, first and second slip speed control means connected respectively with said frequency changers and said motors to control frequency changer operating frequency and motor slip frequency, first and second sensing means coupled with said front and rear motors to continually sense motor operating speed, first and second voltage control means connected with both said first and second sensing means and respectively with said first and second frequency changers to reduce the voltage level of a respective frequency changer if the operating speed of the motor connected with said respective frequency changer exceeds by a predetermined amount the operating speed of the other motor to effect regulation of the difference in operating speeds of said front and rear sets of drive wheels.
Claim 4
Dependent Claim
188 words
A vehicle electric drive including a prime mover driven alternator supplying first and second AC to AC controlled rectifier frequency changers, comprising: front and rear sets of drive wheels, front and rear AC induction drive motors, front and rear differentials coupling said front and rear drive wheels respectively with said front and rear drive motors, means connecting said drive motors for energization respectively by said frequency changers, first and second slip speed control means connected respectively with said frequency changers and said motors to control frequency changer operating frequency and motor slip frequency, first and second sensing means coupled with said front and rear motors to continually sense motor operating speed, first and second voltage control means connected with both said first and second sensing means and respectively with said first and second frequency changers to reduce the voltage level of a respective frequency changer if the operating speed of the motor connected with said respective frequency changer exceeds by a predetermined amount the operating speed of the other motor to effect regulation of the difference in operating speeds of said front and rear sets of drive wheels.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |