STEERING DEVICE
A steering device is provided which can restrain the driver from turning a steering wheel to a position beyond a virtual steering limit position. A base current command value calculation circuit (55) calculates a base current command value (Ias*) based on a steering torque (Th) and a vehicle speed (...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A steering device is provided which can restrain the driver from turning a steering wheel to a position beyond a virtual steering limit position. A base current command value calculation circuit (55) calculates a base current command value (Ias*) based on a steering torque (Th) and a vehicle speed (V). A memory (59) has stored therein a desired steering angle value (¸ E ) that is a constant representing the virtual steering limit position. In the case where a steering angle threshold is set to a value close to, and smaller than, the desired steering angle value (¸ E ), a first correction value calculation circuit (56) calculates a first correction value (Ira*) so that a steering reaction force is increased rapidly when a steering angle (¸s) becomes equal to or larger than the steering angle threshold. A second correction value calculation circuit (57) calculates a second correction value (Irb*) so that the steering angle (¸s) becomes equal to the desired steering angle value (¸ E ) when the steering angle (¸s) becomes equal to or larger than the steering angle threshold. The base current command value (Ias*) is corrected by the first correction value (Ira*) and the second correction value (Irb*). The driver is thus restrained from turning the steering wheel to a position beyond the desired steering angle value (¸ E ). |
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