Steering control system

Abstract

To provide a steering control device capable of suppressing steering of a steering wheel by a driver, while notifying that the processing for increasing the output of a steering motor is being executed.SOLUTION: A steering control device includes: a steering control section 36 which calculates a torque command value Tp* to a steering motor according to a steering state of a steering wheel; and a reaction control section 27 which calculates a steering reaction command value to a reaction motor. The reaction control section 36 executes boost-increase processing for increasing the torque command value Tp* to a value larger than an original value according to a steering state of the steering wheel under a circumstance in which a steering force is easy to lack. During the period at which the boost-increase processing is being executed, the reaction control section 27 executes the processing for increasing the steering reaction command value to a value larger than an original value according to a steering state of the steering wheel.SELECTED DRAWING: Figure 3

Claims

1. A steering shaft for steering the steering wheels of a vehicle, configured such that power transmission between the steering shaft and the steering wheel is separated, A reaction force motor that generates the steering reaction force applied to the steering wheel, A steering control device that controls a steering system comprising a steering motor which generates a steering force for steering the steering wheel, which is a torque applied to the steering shaft, The system includes a control unit configured to calculate a first command value for the steering motor and a second command value for the reaction force motor according to the steering state of the steering wheel, The control unit, When the steering force is likely to be insufficient, a first process is performed to increase the first command value to a value greater than the original value corresponding to the steering state of the steering wheel, During the period in which the first process is performed, the system is configured to perform a second process to increase the second command value to a value greater than the original value corresponding to the steering state of the steering wheel. Furthermore, the control unit is configured to set a value for a category, which is information indicating whether the steering force is likely to be insufficient, according to the steering state of the steering wheels and the driving state of the vehicle, and to execute the first process and the second process based on the value of the category.

2. The steering control device according to claim 1, wherein the control unit is configured to determine that the steering force is likely to be insufficient when the vehicle speed is in the extremely low speed range and the steering wheel is being steered.

3. The steering control device according to claim 1 or 2, wherein the control unit is configured to multiply the original second command value corresponding to the steering state of the steering wheel by a gain or add an added value as the second processing.

4. The steering control device according to claim 1 or 2, wherein the control unit is configured to increase the degree of increase of the first command value when the steering wheel is turned in during the execution of the first process, to be greater than the degree of increase of the first command value when the steering wheel is turned out.

5. The steering control device according to claim 1 or claim 2, wherein the control unit is configured to multiply the original first command value corresponding to the steering state of the steering wheel by a gain or add an added value as the first processing.

6. The steering control device according to claim 1 or claim 2, wherein the control unit is configured to expand the range of change of the first command value by multiplying the limit value that limits the range of change of the first command value by a gain or by adding an additional value as the first process.

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