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 Title: |
US6378636:
Method and system for providing for vehicle drivability feel after accelerator release in an electric or hybrid electric vehicle
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Worrel, Peter Francis; Troy, MI
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| Assignee: |
Ford Global Technologies, Inc., Dearborn, MI
other patents from FORD GLOBAL TECHNOLOGIES, INC. (731510) (approx. 1,926)
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| Published / Filed: |
2002-04-30
/ 2000-10-11
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| Application Number: |
US2000000686454
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| IPC Code: |
Advanced:
B60K 6/48;
B60L 15/20;
B60T 13/58;
B60T 17/22;
B60W 10/08;
B60W 10/18;
B60W 20/00;
B60K 1/04;
Core:
B60K 6/00;
B60T 13/10;
B60T 17/18;
more...
IPC-7:
B60K 1/00;
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| ECLA Code: |
B60W10/08; B60K6/48; B60L15/20; B60T13/58C1; B60T17/22B; B60W10/18; B60W20/00; L60K1/04;
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| U.S. Class: |
Current:
180/065.25;
701/022;
903/947;
Original:
180/065.2;
180/065.4;
701/022;
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| Field of Search: |
180/165,65.1,65.2,65.3,65.4,65.6,65.8
701/022
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| Priority Number: |
| 2000-10-11 |
US2000000686454 |
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| Abstract: |
The invention is a method and system to provide negative torque to an electric vehicle (EV, FCEV, hybrid electric powertrain (HEV)) powertrain when only the electric motor is engaged and the accelerator pedal is released with the ultimate objective to provide consistent vehicle performance under varying operating conditions. This deceleration is at a calibratable amount for a calibratable time period using a hierarchical strategy employing a variety of means including dissipating the vehicle's kinetic energy as heat in the motor; regenerative braking; and activating a mechanical braking system. This negative torque on the powertrain is provided only briefly thereby reducing the total kinetic energy dissipation. The invention provides the driver a vehicle deceleration response similar in "feel" to releasing the accelerator of a conventional ICE vehicle under all operating modes, while maintaining optimal energy recovery.
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| Attorney, Agent or Firm: |
Hanze, Carlos L. ;
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| Primary / Asst. Examiners: |
Dickson, Paul N.; Sy, Mariano
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Family: |
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First Claim:
Show all 13 claims |
I claim:
1. A control system for a vehicle to provide a negative torque to a powertrain with an electric motor, comprising:
- an accelerator means that is operator-movable through a range of positions from a released position to a full power position;
- a means to transmit accelerator means position to a vehicle system control when the accelerator means is at the released position;
- a means to transmit a powertrain state to the vehicle system control;
- a control module within the vehicle system control to receive an output from the means to transmit accelerator position and an output from the means to transmit the powertrain state, wherein the control module determines when the accelerator means is at the released position and the electric motor is the sole source of torque to the powertrain; and
- a hierarchical coast-down strategy means that receives the output from the control module and commands a negative torque means, based on a plurality of vehicle operating conditions, to the vehicle powertrain through a plurality of methods of supplying negative torque when the control module has determined the accelerator is released and the electric motor is the sole torque provider to the powertrain so that the negative torque means maintains optimal energy recovery and deceleration is consistent regardless of the plurality of vehicle operating conditions.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 9 U.S. patent(s) that reference this one
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