US3944899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for electrically driven vehicles
Assignee: ZF International UK Ltd
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Filing: 1974-06-14
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Granted: 1976-03-16
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Expires: 1994-06-14
Abstract
Abstract In a control circuit for an electrically driven vehicle, there is an accelerator pedal which when depressed sets the armature current of a traction motor, and a brake pedal which when depressed provides electrical braking of the vehicle. The electrical braking is inhibited unless the vehicle speed is above a predetermined value.
Inventors
- 👤 Maurice James Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:28
CPC Classifications
B; B60; B60L; B60L7/00; B60L7/10; B60L7/12; B60L50/00; B60L50/50; B60L50/52; H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; B60L2250/00; B60L2250/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/72
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A control circuit for an electrically driven vehicle comprising in combination: A traction motor; an accelerator pedal; means sensitive to the position of the accelerator pedal for controlling the forward drive current to the motor; a brake pedal; braking means operable on actuation of the brake pedal for connecting the motor to provide controlled electrical braking of the vehicle; inhibiting means sensitive to the speed of the vehicle and inhibiting initiation of operation of said braking means when the brake pedal is actuated while the vehicle speed is below a predetermined value; and means for maintaining electrical braking, once commenced, after the vehicle speed falls below the predetermined level.
Claim 2
Dependent Claim
109 words
A control circuit for an electrically driven vehicle comprising in combination: A traction motor; an accelerator pedal; means sensitive to the position of the accelerator pedal for controlling the forward drive current to the motor; a brake pedal; braking means operable on actuation of the brake pedal for connecting the motor to provide controlled electrical braking of the vehicle; inhibiting means sensitive to the speed of the vehicle and inhibiting initiation of operation of said braking means when the brake pedal is actuated while the vehicle speed is below a predetermined value; and means for maintaining electrical braking, once commenced, after the vehicle speed falls below the predetermined level.
Claim 3
Dependent Claim
25 words
A circuit as claimed in claim 1 in which the means for maintaining electrical braking operates until the armature current drops to a set level.
Claim 4
Dependent Claim
20 words
A circuit as claimed in claim 1 in which depression of the accelerator pedal inhibits the provision of electrical braking.
Claim 5
Dependent Claim
25 words
A circuit as claimed in claim 1, including means whereby when neither pedal is depressed, the circuit behaves as if the accelerator pedal is depressed.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |