US5376869A
Expired / Lapsed
US
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Electric vehicle drive train with rollback detection and compensation
Assignee: General Electric Co
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Filing: 1993-02-11
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Granted: 1994-12-27
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Expires: 2013-02-11
Abstract
Abstract An electric vehicle drive train includes a controller for detecting and compensating for vehicle rollback, as when the vehicle is started upward on an incline. The vehicle includes an electric motor rotatable in opposite directions corresponding to opposite directions of vehicle movement. A gear selector permits the driver to select an intended or desired direction of vehicle movement. If a speed and rotational sensor associated with the motor indicates vehicle movement opposite to the intended direction of vehicle movement, the motor is driven to a torque output magnitude as a nonconstant function of the rollback speed to counteract the vehicle rollback. The torque function may be either a linear function of speed or a function of the speed squared.
Inventors
- 👤 Charles E. Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:04
CPC Classifications
B; B60; B60L; B60L15/00; B60L15/20; B60L15/2009; B60L15/2018; B60L50/00; B60L50/10; B60L50/16; B60L50/50; B60L50/60; B60L50/66; B60L2240/00; B60L2240/10; B60L2240/12; B60L2240/40; B60L2240/42; B60L2240/421; B60L2240/423; B60L2240/48; B60L2240/486; B60L2250/00; B60L2250/26; B60W; B60W30/00; B60W30/18; B60W30/18009; B60W30/18109; B60W30/18118; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/7072; Y02T10/72
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
148 words
A drive train for an electric vehicle, said drive train comprising: an electric motor for driving one or more wheels of the vehicle and being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, said electric motor having a controllable torque output magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; and rollback detection and compensation means connected to said electric motor, and responsive to said sensing means and said selector means, for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a predetermined function thereof to counteract the vehicle rollback.
Claim 2
Dependent Claim
148 words
A drive train for an electric vehicle, said drive train comprising: an electric motor for driving one or more wheels of the vehicle and being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, said electric motor having a controllable torque output magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; and rollback detection and compensation means connected to said electric motor, and responsive to said sensing means and said selector means, for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a predetermined function thereof to counteract the vehicle rollback.
Claim 3
Dependent Claim
40 words
A drive train according to claim 1 wherein said rollback detection and compensation means includes means for controlling the output torque magnitude of said electric motor as a nonconstant function of rotational speed of said electric motor during vehicle rollback.
Claim 4
Dependent Claim
40 words
A drive train according to claim 1 wherein said rollback detection and compensation means includes means for controlling the output torque magnitude of said electric motor as a linear function of rotational speed of said electric motor during vehicle rollback.
Claim 5
Dependent Claim
40 words
A drive train according to claim 1 wherein said rollback detection and compensation means includes means for controlling the output torque magnitude of said electric motor as a function of rotational speed squared of said electric motor during vehicle rollback.
Claim 6
Dependent Claim
45 words
A drive train according to claim 1 wherein said rollback detection and compensation means includes means for controlling the output torque magnitude of said electric motor at a predetermined constant value responsive to a rotational speed of said electric motor being above a predetermined value.
Claim 7
Dependent Claim
17 words
A drive train according to claim 1 further comprising a traction battery connected to said electric motor.
Claim 8
Dependent Claim
158 words
A drive train for an electric vehicle, said drive train comprising: a traction battery; an electric motor connected to said traction battery for driving one or more wheels of the vehicle, said electric motor being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, said electric motor having a controllable torque output magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; and rollback detection and compensation means connected to said electric motor, and responsive to said sensing means and said selector means, for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a nonconstant function thereof to counteract the vehicle rollback.
Claim 9
Dependent Claim
158 words
A drive train for an electric vehicle, said drive train comprising: a traction battery; an electric motor connected to said traction battery for driving one or more wheels of the vehicle, said electric motor being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, said electric motor having a controllable torque output magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; and rollback detection and compensation means connected to said electric motor, and responsive to said sensing means and said selector means, for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a nonconstant function thereof to counteract the vehicle rollback.
Claim 10
Dependent Claim
40 words
A drive train according to claim 7 wherein said rollback detection and compensation means includes means for controlling the output torque magnitude of said electric motor as a linear function of rotational speed of said electric motor during vehicle rollback.
Claim 11
Dependent Claim
40 words
A drive train according to claim 8 herein said rollback detection and compensation means includes means for controlling the output torque magnitude of said electric motor as a function of rotational speed squared of said electric motor during vehicle rollback.
Claim 12
Dependent Claim
45 words
A drive train according to claim 9 wherein said rollback detection and compensation means includes means for controlling the output torque magnitude of said electric motor at a predetermined constant value responsive to a rotational speed of said electric motor being above a predetermined value.
Claim 13
Dependent Claim
199 words
A drive train for an electric vehicle, said drive train comprising: an electric motor for driving one or more of wheels of the vehicle and being rotatable in opposite rotational directions corresponding to opposite directions of vehicle movement, said electric motor having a controllable torque magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; driver input means for permitting driver selection of vehicle braking or vehicle acceleration; and control means connected to said electric motor for controlling the output torque magnitude and rotational direction thereof in response to said driver input means, said control means further comprising rollback detection and compensation means responsive to said sensing means and said selector means for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a nonconstant function thereof to thereby counteract the vehicle rollback even in an absence of driver selection of one of vehicle braking and vehicle acceleration.
Claim 14
Dependent Claim
199 words
A drive train for an electric vehicle, said drive train comprising: an electric motor for driving one or more of wheels of the vehicle and being rotatable in opposite rotational directions corresponding to opposite directions of vehicle movement, said electric motor having a controllable torque magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; driver input means for permitting driver selection of vehicle braking or vehicle acceleration; and control means connected to said electric motor for controlling the output torque magnitude and rotational direction thereof in response to said driver input means, said control means further comprising rollback detection and compensation means responsive to said sensing means and said selector means for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a nonconstant function thereof to thereby counteract the vehicle rollback even in an absence of driver selection of one of vehicle braking and vehicle acceleration.
Claim 15
Dependent Claim
86 words
A drive train according to claim 11 wherein said rollback detection and compensation means comprises means for generating a first torque request value as a nonconstant function of rotational speed of said electric motor during vehicle rollback, wherein said control means comprises means for generating a second torque request value responsive to said driver input means during vehicle rollback, and wherein said control means further comprises means for adding the first and second torque request values for controlling the output torque magnitude of said electric motor.
Claim 16
Dependent Claim
37 words
A drive train according to claim 11 wherein said control means includes means for controlling the output torque magnitude of said electric motor as a linear function of rotational speed of said electric motor during vehicle rollback.
Claim 17
Dependent Claim
37 words
A drive train according to claim 11 wherein said control means includes means for controlling the output torque magnitude of said electric motor as a function of rotational speed squared of said electric motor during vehicle rollback.
Claim 18
Dependent Claim
42 words
A drive train according to claim 11 wherein said control means includes means for controlling the output torque magnitude of said electric motor at a predetermined constant value responsive to a rotational speed of said electric motor being above a predetermined value.
Claim 19
Dependent Claim
17 words
A drive train according to claim 11 further comprising a traction battery connected to said electric motor.
Claim 20
Dependent Claim
219 words
An electric vehicle comprising: a frame; one or more vehicle wheels rotatably mounted on said frame; a traction battery carried by said frame; an electric motor connected to said traction battery for driving one or more wheels of the vehicle, said electric motor being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, said electric motor having a controllable torque output magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; driver input means for permitting driver selection of vehicle braking or vehicle acceleration; and control means connected to said electric motor for controlling the output torque magnitude and rotational direction thereof in response to said driver input means, said control means further comprising rollback detection and compensation means responsive to said sensing means and said selector means for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a nonconstant function thereof to thereby counteract the vehicle rollback even in an absence of driver selection of one of vehicle braking and vehicle acceleration.
Claim 21
Dependent Claim
219 words
An electric vehicle comprising: a frame; one or more vehicle wheels rotatably mounted on said frame; a traction battery carried by said frame; an electric motor connected to said traction battery for driving one or more wheels of the vehicle, said electric motor being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, said electric motor having a controllable torque output magnitude; sensing means associated with said electric motor for sensing rotational speed and direction thereof; selector means for permitting driver selection of a direction of intended vehicle movement; driver input means for permitting driver selection of vehicle braking or vehicle acceleration; and control means connected to said electric motor for controlling the output torque magnitude and rotational direction thereof in response to said driver input means, said control means further comprising rollback detection and compensation means responsive to said sensing means and said selector means for determining vehicle rollback defined by a sensed direction of actual vehicle movement opposite to a selected direction of intended vehicle movement and for controlling the output torque magnitude of said electric motor responsive to sensed rotational speed of said electric motor and as a nonconstant function thereof to thereby counteract the vehicle rollback even in an absence of driver selection of one of vehicle braking and vehicle acceleration.
Claim 22
Dependent Claim
85 words
A drive train according to claim 17 wherein said rollback detection and compensation means comprises means for generating a first torque request value as a function of rotational speed of said electric motor during vehicle rollback, wherein said control means comprises means for generating a second torque request value responsive to said driver input means during vehicle rollback, and wherein said control means further comprises means for adding the first and second torque request values for controlling the output torque magnitude of said electric motor.
Claim 23
Dependent Claim
37 words
A drive train according to claim 17 wherein said control means includes means for controlling the output torque magnitude of said electric motor as a linear function of rotational speed of said electric motor during vehicle rollback.
Claim 24
Dependent Claim
37 words
A drive train according to claim 17 wherein said control means includes means for controlling the output torque magnitude of said electric motor as a function of rotational speed squared of said electric motor during vehicle rollback.
Claim 25
Dependent Claim
42 words
A drive train according to claim 17 wherein said control means includes means for controlling the output torque magnitude of said electric motor at a predetermined constant value responsive to a rotational speed of said electric motor being above a predetermined value.
Claim 26
Independent Claim
140 words
A method for operating an electric vehicle including an electric motor for driving one or more wheels of the vehicle and being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, and a selector for permitting driver selection of a direction of intended vehicle movement, said method comprising the steps of: sensing a rotational direction of the electric motor corresponding to a respective direction of actual vehicle moment; determining vehicle rollback defined by the sensed direction of actual vehicle movement being opposite the intended direction of vehicle movement; sensing a rotational speed of the electric motor corresponding to a respective speed of actual vehicle movement; and controlling an output torque magnitude of the electric motor responsive to the sensed rotational speed of the electric motor and as a predetermined function thereof to counteract the vehicle rollback.
Claim 27
Independent Claim
140 words
A method for operating an electric vehicle including an electric motor for driving one or more wheels of the vehicle and being rotatable in opposite directions corresponding to respective opposite directions of actual vehicle movement, and a selector for permitting driver selection of a direction of intended vehicle movement, said method comprising the steps of: sensing a rotational direction of the electric motor corresponding to a respective direction of actual vehicle moment; determining vehicle rollback defined by the sensed direction of actual vehicle movement being opposite the intended direction of vehicle movement; sensing a rotational speed of the electric motor corresponding to a respective speed of actual vehicle movement; and controlling an output torque magnitude of the electric motor responsive to the sensed rotational speed of the electric motor and as a predetermined function thereof to counteract the vehicle rollback.
Claim 28
Dependent Claim
41 words
A method according to claim 22 wherein the step of controlling the electric motor to counteract the vehicle rollback comprises controlling the electric motor at an output torque magnitude as a nonconstant function of sensed rotational speed of the electric motor.
Claim 29
Dependent Claim
40 words
A method according to claim 23 wherein the step of controlling the electric motor at an output torque magnitude comprises controlling the electric motor at an output torque as a linear function of sensed rotational speed of the electric motor.
Claim 30
Dependent Claim
40 words
A method according to claim 23 wherein the step of controlling the electric motor at an output torque magnitude comprises controlling the electric motor at an output torque as a function of sensed rotational speed squared of the electric motor.
Claim 31
Dependent Claim
39 words
A method according to claim 22 wherein the step of controlling the electric motor to counteract the vehicle rollback comprises controlling the electric motor even in an absence of driver selection of one of vehicle braking and vehicle acceleration.
Claim 32
Dependent Claim
74 words
A method according to claim 26 further comprising the steps of generating a first torque request value as a nonconstant function of rotational speed of said electric motor during vehicle rollback, and generating a second torque request value responsive to driver input for either of braking or acceleration of the vehicle; and wherein the step of operating the electric motor comprises adding the first and second torque request values for operating the electric motor.
References Cited (Backward Citations)
DE2411550A1
Cited
US4217643A
Cited
US4351405A
Cited
WO1984002813A1
Cited
US4529919A
Cited
US4629043A
Cited
US5040088A
Cited
USRE34159E
Cited
US4913258A
Cited
EP0374960A2
Cited
FR2660258A1
Cited
WO1993004888A1
Cited
EP0585122A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |