| CPC B62D 15/025 (2013.01) [B62D 5/0421 (2013.01); B62D 5/046 (2013.01); B62D 6/00 (2013.01); B62D 15/024 (2013.01)] | 3 Claims |
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1. A vehicle steering assist device that is applied to a vehicle including a steering wheel with which a driver performs a steering operation, a steering device that steers a steered wheel in accordance with a steering operation amount applied to the steering wheel, a torque applying device that applies torque to the steering wheel, and a processor that controls the torque applying device, wherein:
the processor is configured to
calculate a target steering angle for causing the vehicle to travel along a roadway based on a degree of curvature of the roadway acquired by a degree-of-curvature acquiring device that acquires the degree of curvature of the roadway in front of the vehicle,
calculate a target steering guide torque for guiding steering performed by the driver such that an actual steering angle matches the target steering angle based on a deviation between the target steering angle and the actual steering angle, and
control the torque applying device such that a steering guide torque matches the target steering guide torque; and
the processor is configured to
acquire information of a traveling environment of the vehicle,
calculate a difficulty level of a driving operation performed by the driver based on the information of the traveling environment of the vehicle so as to increase (i) as a vehicle speed increases, (ii) as an amount of rainfall increases, (iii) as a radius of a curve of the roadway is smaller, (iv) as a width of the roadway is smaller,
calculate an index value indicating necessity of the steering guide torque based on the difficulty level of the driving operation such that the index value increases as the difficulty level of the driving operation increases, and
correct the target steering guide torque based on the index value such that the target steering guide torque increases as the necessity of the steering guide torque increases.
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