VEHICLE STEERING SYSTEM AND METHOD OF CONTROLLING THE SAME
First Claim
1. A vehicle steering system comprising:
- a steering wheel, operated by a driver, for steering a vehicle;
a reaction force actuator for adjusting reaction force provided against an operation of the steering wheel;
an actual steering actuator for steering a steered wheel; and
a controller that adjusts magnitude of the reaction force by driving the reaction force actuator in accordance with an operation of the steering wheel, and that controls steering of the steered wheel by driving the actual steering actuator,wherein the controller includes;
a familiarity degree-determining section for determining a degree of driver'"'"'s familiarity with steering characteristics that reflect relations between a certain operation of the steering wheel and both of a reaction force characteristic and an actual steering characteristic of the steered wheel in response to the certain operation of the steering wheel;
a steering characteristic-changing section for changing the steering characteristics in accordance with the determined degree of driver'"'"'s familiarity; and
an actuator operation-controlling section for controlling operation of the reaction force actuator and the actual steering actuator based on the steering characteristics changed by the steering characteristic-changing section.
1 Assignment
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Accused Products
Abstract
An electronic control unit (36) receives a detection value from each sensor (S11), and determines a familiarity degree coefficient Nk_0 indicating the degree of driver'"'"'s familiarity with steering characteristics, using the received detection values (S12). When the coefficient Nk_0 has a value near “0”, a desired actual steering angle δd is calculated to be a small value, and when the coefficient Nk_0 has a value near “1”, a desired actual steering angle δd is calculated to be a large value (S16). When the coefficient Nk O has a value near “0”, a time constant τ of an actual steering actuator (21) is set to a large value, and when the coefficient Nk_0 has a value near “1”, the time constant τ is set to a small value (S 7). A reaction torque Tz is determined based on the coefficient Nk_0 (S18).
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Citations
19 Claims
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1. A vehicle steering system comprising:
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a steering wheel, operated by a driver, for steering a vehicle; a reaction force actuator for adjusting reaction force provided against an operation of the steering wheel; an actual steering actuator for steering a steered wheel; and a controller that adjusts magnitude of the reaction force by driving the reaction force actuator in accordance with an operation of the steering wheel, and that controls steering of the steered wheel by driving the actual steering actuator, wherein the controller includes; a familiarity degree-determining section for determining a degree of driver'"'"'s familiarity with steering characteristics that reflect relations between a certain operation of the steering wheel and both of a reaction force characteristic and an actual steering characteristic of the steered wheel in response to the certain operation of the steering wheel; a steering characteristic-changing section for changing the steering characteristics in accordance with the determined degree of driver'"'"'s familiarity; and an actuator operation-controlling section for controlling operation of the reaction force actuator and the actual steering actuator based on the steering characteristics changed by the steering characteristic-changing section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of controlling a vehicle steering system that includes:
- a steering wheel, operated by a driver, for steering a vehicle;
a reaction force actuator for adjusting reaction force provided against an operation of the steering wheel;
an actual steering actuator for steering a steered wheel; and
a controller that adjusts magnitude of the reaction force by driving the reaction force actuator in accordance with an operation of the steering wheel, and that controls steering of the steered wheel by driving the actual steering actuator, the method comprising;determining a degree of driver'"'"'s familiarity with steering characteristics that reflect relations between a certain operation of the steering wheel and both of a reaction force characteristic and an actual steering characteristic of the steered wheel in response to the certain operation of the steering wheel; changing the steering characteristics in accordance with the determined degree of driver'"'"'s familiarity; and controlling operation of the reaction force actuator and the actual steering actuator based on the changed steering characteristics.
- a steering wheel, operated by a driver, for steering a vehicle;
Specification