Vehicular steering control device, steer-by-wire system, and method for controlling steer-by-wire system
AssigneeHitachi Astemo, Ltd.
InventorMakoto Kimura
Life of this patent
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Abstract
In a vehicular steering control device, a steer-by-wire system, and a method for controlling a steer-by-wire system according to the present invention, if an abnormality of a rotation angle sensor of a turning motor is detected, open-loop control is performed on the turning motor based on a rotation angle of a motor shaft before the abnormality of the rotation angle sensor is detected and information concerning a reaction generation device that applies reaction torque to steering wheel. Consequently, it is possible to continue control of a turning angle even if the rotation angle sensor of the turning motor fails, while suppressing an increase in system cost.
Claims19
A vehicular steering control device of a steer-by-wire system,
- the steer-by-wire system including:
- a reaction generation device capable of applying reaction torque to a steering wheel by actuating a reaction motor;
- a steering device that is mechanically separated from the reaction generation device and is capable of steering a steered wheel by actuating a turning motor;
- and
- a turning motor rotation angle sensor capable of detecting a rotation angle of a motor shaft of the turning motor, and
- the vehicular steering control device, if an abnormality of the turning motor rotation angle sensor is detected, performing open-loop control on the turning motor based on information concerning the reaction generation device.
A steer-by-wire system comprising:
- a reaction generation device capable of applying reaction torque to a steering wheel by actuating a reaction motor;
- a steering device that is mechanically separated from the reaction generation device and is capable of steering a steered wheel by actuating a turning motor;
- and
- a vehicular steering control device capable of controlling the steering device and the reaction generation device,
- wherein the steering device includes a turning motor rotation angle sensor capable of detecting a rotation angle of a motor shaft of the turning motor, and
- the vehicular steering control device, if an abnormality of the turning motor rotation angle sensor is detected, performs open-loop control on the turning motor based on information concerning the reaction generation device.
A method for controlling a steer-by-wire system,
- the steer-by-wire system including:
- a reaction generation device capable of applying reaction torque to a steering wheel by actuating a reaction motor;
- and
- a steering device that is mechanically separated from the reaction generation device and is capable of steering a steered wheel by actuating a turning motor,
- the steering device including a turning motor rotation angle sensor capable of detecting a rotation angle of a motor shaft of the turning motor,
- the method comprising the steps of:
- determining whether there is an abnormality in the turning motor rotation angle sensor;
- if there is no abnormality in the turning motor rotation angle sensor, performing closed-loop control on the turning motor based on a value of the turning motor rotation angle sensor;
- and
- if there is an abnormality in the turning motor rotation angle sensor, performing open-loop control on the turning motor based on information concerning the reaction generation device.
Dependencies are inferred from the claim text.