Vehicle steering control
First Claim
1. A steering apparatus for a vehicle having at least one steered wheel comprising:
- a driver operating unit;
a turning unit;
a backup mechanism selectively operable to mechanically connect the driver operating unit to the turning unit via a first shaft to transmit an input torque from the driver operating unit to the turning unit when the driver operating unit and the turning unit are mechanically connected;
a steering reaction actuator operable to apply a steering reaction torque to the driver operating unit;
a wheel turning actuator operable to apply a wheel turning torque to the turning unit via a second shaft; and
a controller operable to control the wheel turning actuator and the steering reaction actuator, the controller being configured to control the steering reaction actuator based on an operating parameter of the wheel turning actuator.
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Accused Products
Abstract
A steer-by-wire system is provided with a driver operating unit, a turning unit, a backup mechanism, a steering reaction actuator, a wheel turning actuator and a controller. The backup mechanism mechanically connects the driver operating unit to the turning unit via a first shaft to transmit an input torque from the driver operating unit to the turning unit when the driver operating unit and the turning unit are mechanically connected by the backup mechanism. The steering reaction actuator applies a steering reaction torque to the driver operating unit. The wheel turning actuator applies a wheel turning torque to the turning unit via a second shaft. The controller controls the wheel turning actuator and the steering reaction actuator. The controller is configured to control the steering reaction actuator based on an operating parameter of the wheel turning actuator.
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Citations
20 Claims
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1. A steering apparatus for a vehicle having at least one steered wheel comprising:
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a driver operating unit;
a turning unit;
a backup mechanism selectively operable to mechanically connect the driver operating unit to the turning unit via a first shaft to transmit an input torque from the driver operating unit to the turning unit when the driver operating unit and the turning unit are mechanically connected;
a steering reaction actuator operable to apply a steering reaction torque to the driver operating unit;
a wheel turning actuator operable to apply a wheel turning torque to the turning unit via a second shaft; and
a controller operable to control the wheel turning actuator and the steering reaction actuator, the controller being configured to control the steering reaction actuator based on an operating parameter of the wheel turning actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A steering apparatus comprising:
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steering input means for receiving a steering operation from a driver;
turning means for turning at least one steered wheel;
first torque applying means for applying a first wheel turning torque to the turning means via a first transmission path;
second torque applying means for applying a second wheel turning torque to the turning means via a second transmission path;
backup means for mechanically connecting the steering input means to the turning means via the first torque applying means to mechanically transmit an input torque from the steering input means to the turning means via at least part of the second transmission path when the steering input means and the turning means are mechanically connected by the backup means;
steering reaction means for applying a steering reaction torque to the steering input means; and
control means for controlling the steering reaction means based on an operating parameter of the second torque applying means. - View Dependent Claims (12, 13)
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14. A steering controller comprising:
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a first mode control section configured to selectively apply a wheel turning torque to a turning unit for turning at least one wheel via a first transmission path and apply a steering reaction torque to a driver operating unit based on the wheel turning torque transmitted to the turning unit via the first transmission path; and
a second mode control section configured to selectively control a clutch disposed in a second transmission path formed between the driver operating unit and the turning unit to selectively connect and disconnect mechanically the driver operating unit to the turning unit such that a steering torque input of the driver operating unit is transmitted to the turning unit via the second transmission path. - View Dependent Claims (15)
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16. A vehicle steering system controller comprising:
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a first wheel turning actuator control section configured to control a first wheel turning actuator so as to apply a first wheel turning torque to a turning unit via a first torque transmission path in which a backup mechanism is selectively operable to mechanically connect a driver operating unit to the turning unit;
a second wheel turning actuator control section configured to control the second wheel turning actuator so as to apply a second wheel turning torque to the turning unit via a second torque transmission path; and
a steering reaction actuator control section configured to control a steering reaction actuator of the driver operating unit so as to apply a steering reaction torque to the driver operating unit based only on the second wheel turning torque applied to the turning unit by the second wheel turning actuator when at least the second wheel turning actuator is determined to be operating normally. - View Dependent Claims (17, 18)
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19. A steering method comprising:
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applying a wheel turning torque to a turning unit based on a driver input to a driver operating unit via a first transmission path in which the driver input is at least partially non-mechanically transmitted to the turning unit;
applying a steering reaction torque to the driver operating unit in based on the wheel turning torque; and
mechanically connecting the driver operating unit to the turning unit via a backup mechanism forming at least a part of a mechanical transmission path, when at least one of the driver operating unit and the turning unit malfunctions, to transmit a wheel turning torque from the driver operating unit to the turning unit via a mechanical transmission path. - View Dependent Claims (20)
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Specification