Method and system for improving motor vehicle stability incorporating an electric power steering system
First Claim
1. A stabilizing system for a vehicle employing an electric power steering system which generates a desired torque command, the system comprising:
- a vehicle speed sensor, wherein said vehicle speed sensor measures a vehicle speed and transmits a vehicle speed signal representative of said vehicle speed;
an assist mechanism configured apply an assist torque to said electric power steering system, wherein said assist torque is responsive to an assist torque command;
an acceleration sensor, wherein said acceleration sensor measures vehicle acceleration and transmits an acceleration signal representative of said vehicle acceleration;
a controller configured to receive signals including;
a steering wheel torque signal from a torque sensor;
a steering wheel position signal from a steering wheel position sensor;
said vehicle speed signal from said vehicle speed sensor;
said acceleration signal from said acceleration sensor;
said controller further configured to generate said assist torque command comprising a combination of said desired torque command with a compensating torque command; and
wherein said acceleration sensor measures vehicle yaw acceleration and transmits a yaw acceleration signal.
9 Assignments
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Accused Products
Abstract
A method and system for stabilizing a vehicle employing an electric power steering system is disclosed. The method includes receiving as inputs, a desired torque command representative of a steering wheel torque and a vehicle speed signal. The method also includes acquiring an acceleration signal representative of vehicle acceleration. The method further comprises generating an assist torque command, which is a combination of the desired torque command and a compensating torque command where the compensating torque command is responsive to the vehicle speed signal and the acceleration signal.
88 Citations
40 Claims
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1. A stabilizing system for a vehicle employing an electric power steering system which generates a desired torque command, the system comprising:
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a vehicle speed sensor, wherein said vehicle speed sensor measures a vehicle speed and transmits a vehicle speed signal representative of said vehicle speed;
an assist mechanism configured apply an assist torque to said electric power steering system, wherein said assist torque is responsive to an assist torque command;
an acceleration sensor, wherein said acceleration sensor measures vehicle acceleration and transmits an acceleration signal representative of said vehicle acceleration;
a controller configured to receive signals including;
a steering wheel torque signal from a torque sensor;
a steering wheel position signal from a steering wheel position sensor;
said vehicle speed signal from said vehicle speed sensor;
said acceleration signal from said acceleration sensor;
said controller further configured to generate said assist torque command comprising a combination of said desired torque command with a compensating torque command; and
wherein said acceleration sensor measures vehicle yaw acceleration and transmits a yaw acceleration signal. - View Dependent Claims (2, 3)
said second acceleration sensor generates a second acceleration signal representative of said second vehicle acceleration;
said second acceleration signal is a lateral acceleration signal representative of vehicle lateral acceleration; and
said compensating torque command is responsive to said vehicle speed signal, said yaw acceleration, and said lateral acceleration signal.
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4. A stabilizing system for a vehicle employing an electric power steering system which generates a desired torque command, the system comprising:
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a vehicle speed sensor, wherein said vehicle speed sensor measures a vehicle speed and transmits a vehicle speed signal representative of said vehicle speed;
an assist mechanism configured apply an assist torque to said electric power steering system, wherein said assist torque is responsive to an assist torque command;
an acceleration sensor, wherein said acceleration sensor measures vehicle acceleration and transmits an acceleration signal representative of said vehicle acceleration;
a controller configured to receive signals including;
a steering wheel torque signal from a torque sensor;
a steering wheel position signal from a steering wheel position sensor;
said vehicle speed signal from said vehicle speed sensor;
said acceleration signal from said acceleration sensor;
said controller further configured to generate said assist torque command comprising a combination of said desired torque command with a compensating torque command;
wherein said acceleration sensor measures vehicle yaw acceleration and transmits a yaw acceleration signal; and
wherein said compensating torque command is the resultant of frequency based compensation applied via a yaw acceleration compensator to said yaw acceleration signal. - View Dependent Claims (5, 6)
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7. A stabilizing system for a vehicle employing an electric power steering system which generates a desired torque command, the system comprising:
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a vehicle speed sensor, wherein said vehicle speed sensor measures a vehicle speed and transmits a vehicle speed signal representative of said vehicle speed;
an assist mechanism configured apply an assist torque to said electric power steering system, wherein said torque is responsive to an assist torque command;
an acceleration sensor, wherein said acceleration sensor measures vehicle acceleration and transmits an acceleration signal representative of said vehicle acceleration;
a controller configured to receive signals including;
a steering wheel torque signal from a torque sensor;
a steering wheel position signal from a steering wheel position sensor;
said vehicle speed signal from said vehicle speed sensor;
said acceleration signal from said acceleration sensor;
said controller further configured to generate said assist torque command comprising a combination of said desired torque command with a compensating torque command;
wherein said acceleration signal is a lateral acceleration signal; and
wherein said compensating torque command is the resultant of frequency based compensation applied via a lateral acceleration compensator to said lateral acceleration signal. - View Dependent Claims (8, 9)
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10. A stabilizing system for a vehicle employing an electric power steering system which generates a desired torque command, the system comprising:
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a vehicle speed sensor, wherein said vehicle speed sensor measures a vehicle speed and transmits a vehicle speed signal representative of said vehicle speed;
an assist mechanism configured apply an assist torque to said electric power steering system, wherein said assist torque is responsive to an assist torque command;
an acceleration sensor, wherein said acceleration sensor measures vehicle acceleration and transmits an acceleration signal representative of said vehicle acceleration;
a controller configured to receive signals including;
a steering wheel torque signal from a torque sensor;
a steering wheel position signal from a steering wheel position sensor;
said vehicle speed signal from said vehicle speed sensor;
said acceleration signal from said acceleration sensor;
said controller further configured to generate said assist torque command comprising a combination of said desired torque command with a compensating torque command; and
wherein said compensating torque command is characterized by a scheduling of an acceleration scale factor which is the resultant of a speed stability look up table indexed by vehicle speed.
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11. A stabilizing system for a vehicle employing an electric power steering system which generates a desired torque command, the system comprising:
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a vehicle speed sensor, wherein said vehicle speed sensor measures a vehicle speed and transmits a vehicle speed signal representative of said vehicle speed;
an assist mechanism configured apply an assist torque to said electric power steering system, wherein said assist torque is responsive to an assist torque command;
an acceleration sensor, wherein said acceleration sensor measures vehicle acceleration and transmits an acceleration signal representative of said vehicle acceleration;
a controller configured to receive signals including;
a steering wheel torque signal from a torque sensor;
a steering wheel position signal from a steering wheel position sensor;
said vehicle speed signal from said vehicle speed sensor;
said acceleration signal from said acceleration sensor;
said controller further configured to generate said assist torque command comprising a combination of said desired torque command with a compensating torque command;
wherein said compensating torque command is the resultant of application of a compensating torque limit function to a composite feedback signal; and
said compensating torque limit function is responsive to limiting established by a compensating torque limit look up table which is indexed by vehicle speed to generate a limit value for said compensating torque limit function.- View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of stabilizing a vehicle employing an electric power steering system comprising:
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receiving a desired torque command representative of a steering wheel torque desired in said electric power steering system;
receiving a vehicle speed signal representative of a forward speed of said vehicle;
acquiring an acceleration signal representative of vehicle acceleration;
generating an assist torque command comprising a combination of desired torque command with a compensating torque command;
applying said assist torque command to an assist mechanism;
wherein said acceleration signal is generated by an acceleration sensor that measures said vehicle acceleration and transmit said acceleration signal;
wherein said compensating torque command is responsive to said vehicle speed signal and said acceleration signal; and
wherein said acceleration signal is a yaw acceleration signal. - View Dependent Claims (21, 22)
said second acceleration signal is generated by a second acceleration sensor that measures said second vehicle acceleration;
said second acceleration signal is a lateral acceleration signal representative of vehicle lateral acceleration; and
wherein said compensating torque command is responsive to said vehicle speed signal, said yaw acceleration, and said lateral acceleration signal.
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23. A method of stabilizing a vehicle employing an electric power steering system comprising:
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receiving a desired torque command representative of a steering wheel torque desired in said electric power steering power;
receiving a vehicle speed signal representative of a forward speed of said vehicle;
acquiring an acceleration signal representative of vehicle acceleration;
generating an assist torque command comprising a combination of said desired torque command with a compensating torque command;
applying said assist torque command to an assist mechanism;
wherein said acceleration signal is generated by an acceleration sensor that measures said vehicle acceleration and transmit said acceleration signal;
wherein said compensating torque command is responsive to said vehicle speed signal and said acceleration signal;
wherein said acceleration signal is a yaw acceleration signal; and
wherein said compensating torque command is the resultant of frequency based compensation applied via a yaw acceleration compensator to said yaw acceleration signal. - View Dependent Claims (24, 25)
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26. A method of stabilizing a vehicle employing an electric power steering system comprising:
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receiving a desired torque command representative of a steering wheel torque desired in said electric power steering system;
receiving a vehicle speed signal representative of a forward speed of said vehicle;
acquiring an acceleration signal representative of vehicle acceleration;
generating an assist torque command comprising a combination of said desired torque command with a compensating torque command;
applying said assist torque command to an assist mechanism;
wherein said acceleration signal is generated by an acceleration sensor that measures said vehicle acceleration and transmit said acceleration signal;
wherein said compensating torque command is responsive to said vehicle speed signal and said acceleration signal;
wherein said acceleration signal is a lateral acceleration signal; and
wherein said compensating torque command is the resultant of frequency based compensation applied via a lateral acceleration compensator to said lateral acceleration signal. - View Dependent Claims (27, 28)
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29. A method of stabilizing a vehicle employing an electric power steering system comprising:
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receiving a desired torque command representative of a steering wheel torque desired in said electric power steering system;
receiving a vehicle speed signal representative of a forward speed of said vehicle;
acquiring an acceleration signal representative of vehicle acceleration;
generating an assist torque command comprising a combination of said desired torque command with a compensating torque command;
applying said assist torque command to an assist mechanism;
wherein said acceleration signal is generated by an acceleration sensor that measures said vehicle acceleration and transmit said acceleration signal;
wherein said compensating torque command is responsive to said vehicle speed signal and said acceleration signal; and
wherein said compensating torque command is characterized by the scheduling of said acceleration signal by acceleration scale factor which is the resultant of a speed stability look up table indexed by vehicle speed.
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30. A method of stabilizing a vehicle employing an electric power steering system comprising:
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receiving a desired torque command representative of a steering wheel torque desired in said electric power steering system;
receiving a vehicle speed signal representative of a forward speed of said vehicle;
acquiring an acceleration signal representative of vehicle acceleration;
generating an assist torque command comprising a combination of said desired torque command with a compensating torque command;
applying said assist torque command to an assist mechanism;
wherein said acceleration signal is generated by an acceleration sensor that measures said vehicle acceleration and transmit said acceleration signal;
wherein said compensating torque command is responsive to said vehicle speed signal and said acceleration signal; and
wherein said compensating torque command is the resultant of application of a compensating torque limit function to a composite feedback signal; and
said compensating torque limit function is responsive to limiting established by a compensating torque limit look up table which is indexed by vehicle speed to generate a limit value for said compensating torque limit function.- View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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39. A storage medium encoded with a machine-readable computer program code for stabilizing a vehicle employing an electric power steering system said storage medium including instruction for causing a computer to implement a method comprising:
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receiving a desired torque command representative of a steering wheel torque desired in said electric power steering system;
receiving a vehicle speed signal representative of a forward speed of said vehicle;
acquiring an acceleration signal representative of vehicle acceleration;
generating an assist torque command comprising a combination of said desired torque command with a compensating torque command;
applying said assist torque command to an assist mechanism;
wherein said acceleration signal is generated by an acceleration sensor that measures said vehicle acceleration and transmit said acceleration signal;
wherein said compensating torque command is responsive to said vehicle speed signal and said acceleration signal; and
wherein said compensating torque command is the resultant of application of a compensating torque limit function to a composite feedback signal; and
said compensating torque limit function is responsive to limiting established by a compensating torque limit look up table which is indexed by vehicle speed to generate a limit value for said compensating torque limit function.
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40. A computer data signal for stabilizing a vehicle employing an electric power steering system said computer data signal comprising code for causing a computer to implement a method comprising:
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receiving a desired torque command representative of a steering wheel torque desired in said electric power steering system;
receiving a vehicle speed signal representative of a forward speed of said vehicle;
acquiring an acceleration signal representative of vehicle acceleration;
generating an assist torque command comprising a combination of said desired torque command with a compensating torque command;
applying said assist torque command to assist mechanism;
wherein said acceleration signal is generated by an acceleration sensor that measures said vehicle acceleration and transmit said acceleration signal;
wherein said compensating torque command is responsive to said vehicle speed signal and said acceleration signal; and
wherein said compensating torque command is the resultant of application of a compensating torque limit function to a composite feedback signal; and
said compensating torque limit function is responsive to limiting established by a compensating torque limit look up table which is indexed by vehicle speed to generate a limit value for said compensating torque limit function.
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Specification