Abstract: The steering control device includes: current command value 1 calculation unit 11 which determines current command value 1 based on a vehicle speed and a steering torque; current command value 2 calculation unit 14 which determines current command value 2 based on a filtered differential value of the steering torque; and current drive unit 10 which drives motor 5 so that the value of the motor current matches the sum of current command values 1 and 2. When a first crossover frequency represents the crossover frequency of control open loop characteristics in the steering control device as obtained when current command value 2 is determined using a differential value of the steering torque which has not been filtered, the notch frequency of the notch filter is set to be greater than the mechanical resonance frequency of the steering control device and smaller than the first crossover frequency.

Abstract: A vehicle steering control apparatus having high robustness while ensuring the accuracy of automatic parking. The steering control apparatus includes a target parking position computing module to calculate a target parking position, a target line computing module to calculate a target parking line, an own vehicle position target attitude angle computing module to calculate an own vehicle position target attitude angle, an own vehicle attitude angle, and the target parking line, an own vehicle position target curvature computing module to calculate an own vehicle position target curvature, and a steering controller for calculating a target steering angle based on the own vehicle position target curvature and performing control such that the actual steering angle matches the target steering angle.

Abstract: When an adjustment information input unit (1) acquires one of information of a feeling value and steering control information, a steering control information calculation unit (2) calculates data of a control characteristic graph visually representing control characteristics of steering using the acquired information. An adjustment information display unit (3) displays, on the same screen, a control characteristic graph in accordance with the data of the control characteristic graph and a feeling value operation section visually showing the feeling value.

Abstract: A vibration actuator includes: a coil having a vibration space along an axial direction; an outer case that covers the coil and that extends the vibration space in the axial direction; a movable element that comprises a magnet that vibrates within the coil and a weight unit that vibrates within the outer case and that is connected to one end side, in the axial direction, of the magnet; and an elastic member that supports elastically the vibration of the movable element in the axial direction. A resin layer is secured to an outer peripheral surface of the weight unit that faces an inner surface of the outer case. An oil film is interposed between the resin layer and the inner surface of the outer case.

Abstract: Provided is a steering control device, including: an actuator for applying a steering assist torque to a steering system of a vehicle; a vehicle turning state detection section for detecting a state amount representing a turning state of the vehicle; a steering-holding determination section for determining a steering-holding state of the steering system; a storing section for storing, when the steering-holding determination section determines that the steering system is in the steering-holding state, the state amount detected by the vehicle turning state detection section as a steering-holding determination state amount; a steering assist torque calculation section for calculating the steering assist torque based on an absolute value of the steering-holding determination state amount; and an actuator control section for controlling the actuator based on the calculated steering assist torque.

Abstract: A steering control apparatus is obtained which includes an assist instruction-value correction device for calculating, based on a result of a friction transition-state determination device, an assist correction value in order to obtain an assist instruction-value after its correction being made by correcting a basic assist instruction-value so that a hysteresis width of steering torque increases at the time of turn-back steering, and an electric current driving device for driving a motor so that an electric current of the motor is coincident with an electric current instruction-value therefor after its correction being made on the basis of the assist instruction-value after its correction being made; and the friction transition-state determination device determines the friction transition-state by integrating a differential value of steering-shaft reaction torque using an integrator having a limiting function to an upper or lower limit value defined in advance.

Abstract: Provided are a steering control device and the like, including the steps of: calculating a steering assist torque to be applied to an actuator for applying the steering assist torque to a steering system of a vehicle in order to improve return characteristics of the steering system; determining a steering state of a driver; correcting the steering assist torque depending on a result of the steering state determination; and controlling the actuator depending on the corrected steering assist torque, in which the step of determining a steering state of a driver includes determining the steering state of the driver based on a combination of at least two of the following: a manually-operating steering state determination; an abrupt steering wheel return determination; a high-acceleration steering wheel return determination; a manual return steering determination; and an additional-steering determination.

Abstract: The steering control device includes: current command value 1 calculation unit 11 which determines current command value 1 based on a vehicle speed and a steering torque; current command value 2 calculation unit 14 which determines current command value 2 based on a filtered differential value of the steering torque; and current drive unit 10 which drives motor 5 so that the value of the motor current matches the sum of current command values 1 and 2. When a first crossover frequency represents the crossover frequency of control open loop characteristics in the steering control device as obtained when current command value 2 is determined using a differential value of the steering torque which has not been filtered, the notch frequency of the notch filter is set to be greater than the mechanical resonance frequency of the steering control device and smaller than the first crossover frequency.

Abstract: A first weight portion of a vibration actuator includes an inner-side enlarged portion that protrudes from an end portion of a solid head in a direction of a vibration axis and that is inserted into an opening portion extending within a first compression coil spring along the direction of the vibration axis. An outer peripheral surface of the inner-side enlarged portion becomes continuously smaller in diameter from a base end towards a free end, with the vibration axis being the center of the diameter. That is, the inner-side enlarged portion has the shape of a truncated cone. The inner-side enlarged portion is inserted into the opening portion of the first compression coil spring and the opening portion is utilized to change the length of the inner-side enlarged portion in the direction of the vibration axis, thereby changing the mass of the first weight portion.

Abstract: Provided is a vehicle steering control apparatus having high robustness while ensuring the accuracy of automatic parking in a vehicle equipped with an automatic parking assistance system. The vehicle steering control apparatus includes a target parking position computing module to calculate a target parking position, a target line computing module to calculate a target parking line, an own vehicle position target attitude angle computing module to calculate an own vehicle position target attitude angle, an own vehicle attitude angle, and the target parking line, an own vehicle position target curvature computing module to calculate an own vehicle position target curvature, and a steering controller for calculating a target steering angle based on the own vehicle position target curvature and performing control such that the actual steering angle matches the target steering angle.

Abstract: A steering control apparatus is obtained which includes an assist instruction-value correction device for calculating, based on a result of a friction transition-state determination device, an assist correction value in order to obtain an assist instruction-value after its correction being made by correcting a basic assist instruction-value so that a hysteresis width of steering torque increases at the time of turn-back steering, and an electric current driving device for driving a motor so that an electric current of the motor is coincident with an electric current instruction-value therefor after its correction being made on the basis of the assist instruction-value after its correction being made; and the friction transition-state determination device determines the friction transition-state by integrating a differential value of steering-shaft reaction torque using an integrator having a limiting function to an upper or lower limit value defined in advance.

Abstract: A steering control device capable of causing a steering torque to follow a target steering torque when a driver holds a steering wheel for steering, and making an adjustment so that the steering wheel returns to a neutral position at an appropriate speed, when the driver releases his or her hands from the steering wheel. A motor is controlled based on a motor steering assist torque, which is a sum of a first steering assist torque, which is proportional to an integral value of a deviation between the target steering torque and the steering torque, and a second steering assist torque, which is proportional to a motor rotational angular velocity and acting in a direction of suppressing a return speed of the steering wheel when the steering wheel returns to the neutral position.

Abstract: Provided are a steering control device and a steering control method therefor, which reduce a steering feeling of discomfort due to a pulsed change (short abrupt change) in steering assist torque caused when control such as steering wheel return control is turned on/off, and which acquire a sufficient control effect even when high control response is required, by reducing a fluctuation in steering assist torque caused when one steering assist torque is selected from two or more steering assist torques by low-pass filtering, and by correcting the low-pass filtering depending on a change amount of the selected steering assist torque.

Abstract: A cylindrical magnet of an oscillating actuator includes a plurality of divided magnet portions which are magnetized in the radial direction. Since adjacent magnet portions have different poles in the direction of an oscillation axis, magnetic poles do not repel each other when adhering the magnet portions and it is thus easy to adhere the magnet portions to each other. In addition to this construction of the magnet, a coil includes a plurality of divided coil portions corresponding to the magnet portions in the direction of the oscillation axis, and adjacent coil portions are wound in opposite directions to each other.

Abstract: Provided are a vehicle steering device and the like, which are capable of converging a lateral displacement at a forward gazing-point distance to a target travel line with simple control. A target travel line for a vehicle to travel by following a travel path recognized from an image taken by a camera or the like is set. A lateral speed, which is a change amount of the lateral displacement that is a difference between a position of the target travel line at the forward gazing-point distance and a position of the vehicle, is controlled so that the lateral displacement is reduced. A target steering angle is calculated based on the lateral speed, and a steering angle of the vehicle is controlled based on the calculated target steering angle.

Abstract: In a steering control device, a road surface reaction force torque calculation module (52) uses a vehicle speed, steering angle, and vehicle model to calculate a caster-trail-caused torque, a self-aligning torque, and a road surface reaction force torque. A reaction force command current calculation module (53) uses the road surface reaction force torque and the vehicle speed to calculate a reaction force command current.

Abstract: Provided are a steering control device and a steering control method therefor, which reduce a steering feeling of discomfort due to a pulsed change (short abrupt change) in steering assist torque caused when control such as steering wheel return control is turned on/off, and which acquire a sufficient control effect even when high control response is required, by reducing a fluctuation in steering assist torque caused when one steering assist torque is selected from two or more steering assist torques by low-pass filtering, and by correcting the low-pass filtering depending on a change amount of the selected steering assist torque.

Abstract: Provided are a steering control device and the like, including the steps of: calculating a steering assist torque to be applied to an actuator for applying the steering assist torque to a steering system of a vehicle in order to improve return characteristics of the steering system; determining a steering state of a driver; correcting the steering assist torque depending on a result of the steering state determination; and controlling the actuator depending on the corrected steering assist torque, in which the step of determining a steering state of a driver includes determining the steering state of the driver based on a combination of at least two of the following: a manually-operating steering state determination; an abrupt steering wheel return determination; a high-acceleration steering wheel return determination; a manual return steering determination; and an additional-steering determination.

Abstract: Provided is a steering control device, including: an actuator for applying a steering assist torque to a steering system of a vehicle; a vehicle turning state detection section for detecting a state amount representing a turning state of the vehicle; a steering-holding determination section for determining a steering-holding state of the steering system; a storing section for storing, when the steering-holding determination section determines that the steering system is in the steering-holding state, the state amount detected by the vehicle turning state detection section as a steering-holding determination state amount; a steering assist torque calculation section for calculating the steering assist torque based on an absolute value of the steering-holding determination state amount; and an actuator control section for controlling the actuator based on the calculated steering assist torque.

Abstract: An automatic steering apparatus that can suppress steering wheel vibration and that can also smooth angular control. In the automatic steering apparatus, a motor that steers steered wheels is controlled by a control unit. Information from an angle sensor that generates a signal that corresponds to a steering angle of the steered wheels is sent to the control unit. The control unit corrects a target steering angle of the steered wheels such that angular acceleration of the target steering angle is less than or equal to a limiting value. The control unit controls the motor such that the steering angle of the steered wheels tracks the corrected target steering angle based on the information from the angle sensor.