IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0553093
(2006-10-26)
|
등록번호 |
US-8620498
(2013-12-31)
|
발명자
/ 주소 |
- Zerbini, Mark A.
- Tamai, Goro
|
출원인 / 주소 |
- GM Global Technology Operations LLC
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
13 |
초록
▼
A method of regulating operation of a hybrid vehicle traveling on a surface having a grade includes determining a drive force of the hybrid vehicle, calculating a brake pressure value and determining whether a grade freeze condition exists based on the brake pressure value. The method further includ
A method of regulating operation of a hybrid vehicle traveling on a surface having a grade includes determining a drive force of the hybrid vehicle, calculating a brake pressure value and determining whether a grade freeze condition exists based on the brake pressure value. The method further includes calculating a grade value of the surface based on the drive force when the freeze condition does not exist and regulating operation of the hybrid vehicle based on the grade value.
대표청구항
▼
1. A grade determination system for a hybrid vehicle that travels on a surface, comprising: a first module that determines a net force on said hybrid vehicle;a second module that calculates a grade value of said surface based on said net force; anda third module that, based on said grade value, at l
1. A grade determination system for a hybrid vehicle that travels on a surface, comprising: a first module that determines a net force on said hybrid vehicle;a second module that calculates a grade value of said surface based on said net force; anda third module that, based on said grade value, at least one of maintains a lower gear when said hybrid vehicle is in cruise control and adjusts an idle speed of an engine of said hybrid vehicle. 2. The grade determination system of claim 1 wherein said second module holds said grade value equal to a previous grade value when one or more of a plurality of conditions are true, wherein said plurality of conditions includes a brake on condition, a shift in progress condition, a time since a gear shift being less than a respective threshold time condition, a time since a range shift being less than a respective threshold time condition, a reduced vehicle speed condition, a time since a wheel slip was detected being less than a respective threshold time condition, a rate of throttle change condition, a time since a throttle change being less than a respective threshold time condition, a rate of braking change condition, a time since a braking change being less than a respective threshold time condition and a time since a fuel off event being less than a respective threshold time condition. 3. The grade determination system of claim 2 wherein said third module, based on said grade value, at least one of maintains said lower gear when said hybrid vehicle is in cruise control and adjusts said idle speed of said engine upon expiration of a predetermined time period after said one or more of said plurality of conditions transition from true to false. 4. The grade determination system of claim 1 wherein said grade value is calculated as a tangent of a cosine of a quotient of said net force and a product of a mass of said hybrid vehicle and a gravitational constant. 5. The grade determination system of claim 1 further comprising filtering said grade value by averaging said grade value with N previous grade values, wherein N is an integer greater than or equal to one. 6. A method of regulating operation of a hybrid vehicle traveling on a surface having a grade, comprising: determining a net force on said hybrid vehicle;calculating a grade value of said surface based on said net force; andbased on said grade value, at least one of maintaining a lower gear when said hybrid vehicle is in cruise control and adjusting an idle speed of an engine of said hybrid vehicle. 7. The method of claim 6 further comprising holding said grade value equal to a previous grade value when one or more of a plurality of conditions are true, wherein said plurality of conditions includes a brake on condition, a shift in progress condition, a time since a gear shift being less than a respective threshold time condition, a time since a range shift being less than a respective threshold time condition, a reduced vehicle speed condition, a time since a wheel slip was detected being less than a respective threshold time condition, a rate of throttle change condition, a time since a throttle change being less than a respective threshold time condition, a rate of braking change condition, a time since a braking change being less than a respective threshold time condition and a time since a fuel off event being less than a respective threshold time condition. 8. The method of claim 7 further comprising said based on said grade value, at least one of maintaining said lower gear when said hybrid vehicle is in cruise control and adjusting said idle speed of said engine upon expiration of a predetermined time period after said one or more of said plurality of conditions transition from true to false. 9. The method of claim 6 further comprising calculating said grade value as a tangent of a cosine of a quotient of said net force and a product of a mass of said hybrid vehicle and a gravitational constant. 10. The method of claim 6 further comprising filtering said grade value by averaging said grade value with N previous grade values, wherein N is an integer greater than or equal to one. 11. The grade determination system of claim 1, wherein said net force includes a difference between a force driving said hybrid vehicle and a sum of an aerodynamic force against said hybrid vehicle, a resistive force against rolling of tires of said hybrid vehicle, a braking force against said hybrid vehicle, a mass of said hybrid vehicle, and an acceleration of said hybrid vehicle. 12. The grade determination system of claim 11, wherein said force driving said hybrid vehicle is based on axle torque and radii of tires of said hybrid vehicle, wherein said aerodynamic force is based on air temperature, air pressure, and a speed of said hybrid vehicle, and wherein said resistive force is based on a rolling resistance of said tires, said mass of said hybrid vehicle, and a gravitational constant. 13. The grade determination system of claim 12, wherein said braking force is based on a pressure of brake fluid downstream from a master brake cylinder, said speed of said hybrid vehicle, and said rolling resistance of said tires. 14. The grade determination system of claim 1, wherein said third module at least one of prevents said engine of said hybrid vehicle from stopping when said grade value is greater than a first threshold, actuates vehicle hill holding devices when said grade value is greater than a second threshold, maintains said lower gear when said hybrid vehicle is in cruise control and said grade value is less than a third threshold, and adjusts said idle speed of said engine to prevent said hybrid vehicle from rolling backwards when said grade value is less than a fourth threshold, wherein said first, second, and fourth thresholds are greater than zero, and wherein said third threshold is less than zero. 15. The method of claim 6, wherein said net force includes a difference between a force driving said hybrid vehicle and a sum of an aerodynamic force against said hybrid vehicle, a resistive force against rolling of tires of said hybrid vehicle, a braking force against said hybrid vehicle, a mass of said hybrid vehicle, and an acceleration of said hybrid vehicle. 16. The method of claim 15, further comprising: determining said force driving said hybrid vehicle based on axle torque and radii of tires of said hybrid vehicle;determining said aerodynamic force based on air temperature, air pressure, and a speed of said hybrid vehicle; anddetermining said resistive force based on a rolling resistance of said tires, said mass of said hybrid vehicle, and a gravitational constant. 17. The method of claim 16, further comprising: determining said braking force based on a pressure of brake fluid downstream from a master brake cylinder, said speed of said hybrid vehicle, and said rolling resistance of said tires. 18. The method of claim 6, further comprising at least one of: preventing said engine of said hybrid vehicle from stopping when said grade value is greater than a first threshold;actuating vehicle hill holding devices when said grade value is greater than a second threshold;maintaining said lower gear when said hybrid vehicle is in cruise control and said grade value is less than a third threshold; andadjusting said idle speed of said engine to prevent said hybrid vehicle from rolling backwards when said grade value is less than a fourth threshold,wherein said first, second, and fourth thresholds are greater than zero, and wherein said third threshold is less than zero.
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