US5726890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for electric vehicle
Assignee: Hitachi Ltd
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Filing: 1995-09-06
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Granted: 1998-03-10
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Expires: 2015-09-06
Abstract
Abstract An electric vehicle control unit capable of position control so that the vehicle can be held in its stop position without vibration, even if an operator does not keep the brake pressed. The control circuit of the electric vehicle comprises a speed/torque instruction generation circuit, a position control selection circuit, a position instruction generation circuit and a motor control circuit. When the vehicle stops, control of the motor is changed from speed or torque control to position control.
Inventors
- 👤 Yuusuke Takamoto
- 👤 Ryoso Masaki
- 👤 Sanshiro Obara
- 👤 Satoru Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 02:26
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/02; H02P3/025; B; B60; B60L; B60L15/00; B60L15/20; B60L15/2009; B60L15/2018; B60L7/00; B60L7/02; B60L7/06; B60L7/08; B60L2220/00; B60L2220/10; B60L2220/12; B60L2240/00; B60L2240/10; B60L2240/12; B60L2240/40; B60L2240/42; B60L2240/421; B60L2240/423; B60L2250/00; B60L2250/26; B60L2260/00; B60L2260/20; B60L2260/22; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
Method of controlling operation of a vehicle propelled by a motor, comprising the steps of: sensing a stop position of said vehicle where said vehicle comes to a stop; and maintaining the vehicle in said stop position by controlling torque of said motor.
Claim 2
Dependent Claim
43 words
Method of controlling operation of a vehicle propelled by a motor, comprising the steps of: sensing a stop position of said vehicle where said vehicle comes to a stop; and maintaining the vehicle in said stop position by controlling torque of said motor.
Claim 3
Dependent Claim
12 words
Method according to claim 1 wherein said motor is an electric motor.
Claim 4
Dependent Claim
38 words
Method of controlling operation of a vehicle propelled by a motor, comprising the steps of: determining a stop target position of said vehicle; and maintaining said vehicle in said stop target position by controlling torque of said motor.
Claim 5
Dependent Claim
38 words
Method of controlling operation of a vehicle propelled by a motor, comprising the steps of: determining a stop target position of said vehicle; and maintaining said vehicle in said stop target position by controlling torque of said motor.
Claim 6
Dependent Claim
20 words
Method according to claim 3 wherein said controlling step maintains said vehicle independent of a braking operation of said vehicle.
Claim 7
Dependent Claim
12 words
Method according to claim 3 wherein said motor is an electric motor.
Claim 8
Dependent Claim
12 words
Method according to claim 4 wherein said motor is an electric motor.
Claim 9
Dependent Claim
25 words
Method according to claim 1 wherein controlling torque of said motor comprises: controlling a current flowing in said motor to maintain said vehicle stop position.
Claim 10
Dependent Claim
12 words
Method according to claim 7 wherein said motor is an electric motor.
Claim 11
Dependent Claim
28 words
Method according to claim 3 wherein controlling torque of said motor comprises: controlling a current flowing in said motor to maintain said vehicle in said stop target position.
Claim 12
Dependent Claim
12 words
Method according to claim 9 wherein said motor is an electric motor.
Claim 13
Dependent Claim
83 words
Method of controlling operation of a vehicle propelled by a motor, comprising: detecting a stop of said vehicle; determining a stopped position of said vehicle at a time of said stop; detecting magnitude of brake operation during a stopping period, following said stop and before commencement of movement of said vehicle; controlling output torque of said motor as a function of detected magnitude of said brake operation, to a value sufficient to maintain said vehicle in said stopped position during said stopping period.
Claim 14
Dependent Claim
83 words
Method of controlling operation of a vehicle propelled by a motor, comprising: detecting a stop of said vehicle; determining a stopped position of said vehicle at a time of said stop; detecting magnitude of brake operation during a stopping period, following said stop and before commencement of movement of said vehicle; controlling output torque of said motor as a function of detected magnitude of said brake operation, to a value sufficient to maintain said vehicle in said stopped position during said stopping period.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-09 | 2001-09-08 | 2002-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-09 | 2005-09-08 | 2006-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-09 | 2009-09-08 | 2010-03-10 | $7700.00 | Window Closed / Lapsed |