Electric power steering systems with improved road feel
First Claim
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1. A method of controlling a motor drive torque in an electric power steering system having a motor and a steering assembly, the method comprising the steps of:
- measuring, with a torque sensor, internal vibrations within the steering assembly representing smooth road shake (SRS) to generate a torque signal;
processing the torque signal in accordance with a steering perception program to produce a motor control signal suitable to control the motor;
evaluating the smooth road shake (SRS) of the torque signal and generating a dithering signal based on the smooth road shake (SRS) of the torque signal;
superimposing the dithering signal onto the motor control signal to linearize the motor control signal with the dithering signal and produce a dithered motor control signal; and
controlling the motor drive torque of the motor on the steering assembly based on the dithered motor control signal.
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Abstract
A method is provided for controlling a motor drive torque in an EPS system having a motor and a steering assembly. The method includes receiving a torque signal from the steering assembly; processing the torque signal in accordance with a steering perception program to produce a motor control signal; and controlling the motor drive torque based on the motor control signal.
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Citations
17 Claims
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1. A method of controlling a motor drive torque in an electric power steering system having a motor and a steering assembly, the method comprising the steps of:
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measuring, with a torque sensor, internal vibrations within the steering assembly representing smooth road shake (SRS) to generate a torque signal; processing the torque signal in accordance with a steering perception program to produce a motor control signal suitable to control the motor; evaluating the smooth road shake (SRS) of the torque signal and generating a dithering signal based on the smooth road shake (SRS) of the torque signal; superimposing the dithering signal onto the motor control signal to linearize the motor control signal with the dithering signal and produce a dithered motor control signal; and controlling the motor drive torque of the motor on the steering assembly based on the dithered motor control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for controlling a motor drive torque for a vehicle having a motor and a steering assembly, the system comprising:
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a sensor configured to measure internal vibrations within the steering assembly representing smooth road shake (SRS) to generate a torque signal; and a processor coupled to the sensor and configured to at least facilitate; receiving the torque signal from the sensor; processing the torque signal in accordance with a steering perception program to produce a motor control signal suitable to control the motor; evaluating the smooth road shake (SRS) of the torque signal and generating a dithering signal based on the smooth road shake (SRS) of the torque signal; superimposing the dithering signal onto the motor control signal to reduce the non-linearities of the steering system with the dithering signal and produce a dithered motor control signal; and controlling the motor drive torque based on the dithered motor control signal. - View Dependent Claims (13, 14, 15, 16)
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17. A non-transitory program product for controlling a motor drive torque for a vehicle having a motor and a steering assembly, the non-transitory program product comprising:
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a program configured to at least facilitate; receiving a torque feedback signal from a torque sensor measuring internal vibrations within the steering assembly representing smooth road shake (SRS); applying steering perception algorithms to the torque signal to generate a motor control signal suitable to control the motor; evaluating the smooth road shake (SRS) of the torque signal and generating a dithering signal based on the smooth road shake (SRS) of the torque signal; superimposing the dithering signal to the motor control signal onto produce a dithered motor control signal; and controlling the motor drive torque based on the dithered motor control signal; and a computer-readable signal bearing media bearing the program.
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Specification