Abstract: An electric power steering apparatus that enables implementation of a desired steering torque without being affected by a state of a road surface by controlling a steering torque so as to become a value corresponding a steering angle and a steering angular velocity. The apparatus includes a SAT compensation value calculating section that calculates a SAT compensation value based on a SAT value; and a steering reaction compensation value calculating section that calculates a steering reaction compensation value based on the SAT compensation value, a steering angle and a steering angular velocity, and corrects the current command value by the steering reaction compensation value. Further, an electric power steering apparatus controls a twist angle of a torsion bar so as to follow a value corresponding to a steered angle.

Abstract: An electric power steering apparatus that can suppress deterioration of steering feeling by changing a current command value of a normal system in motor control by two systems when an abnormality occurs in any of the systems. The steering apparatus calculates a current command value to a motor having two-system motor windings for each system, comprises a current command value adjusting section that calculates the current command value by using a steering assist command value and a compensation current command value.

Abstract: An electric power steering apparatus includes a steering angle control section that calculates a steering angle control current command value for the steering angle control, calculates the current command value using at least the steering angle control current command value; the steering angle control section includes a position control section that calculates a basic steering angular velocity command value, a steering intervention compensating section that obtains a compensatory steering angular velocity command value, and a steering angular velocity control section that calculates the steering angle control current command value by the basic steering angular velocity command value, the compensatory steering angular velocity command value and an actual steering angular velocity; the steering intervention compensating section includes a compensation gain section that multiplies the steering torque by a steering intervention compensation gain, and obtains the compensatory steering angular velocity command valu

Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that gradual-changes a steering angle control command value, an assist control command value and also a steering angle speed command value, suppresses an excessive accumulation of an integral value in a speed control by being provided a steering speed command value with a limiter, and does not give the driver an uncomfortable feeling.

Abstract: When a steering operation by a driver intervenes during autonomous driving of a vehicle, the intervention operation is fully reflected and a feeling of strangeness and a feeling of discomfort that may be given to the driver are reduced. In order to attain this, an ECU of an electric power steering apparatus includes: a steering angle control section 200 to which a steering angle command value is input to control a steering angle; an assist control section 147 to which an assist map gradual change gain is input to output an assist control output gradual change gain; and a switching determination/gradual change gain generating section 145 that generates a gradual change gain, by which steering angle control output and assist control output are multiplied, and multiplies the gradual change gain to make a switching determination between a steering angle control mode by the steering angle control section 200 and an assist control mode by the assist control section 147.

Abstract: An electric power steering apparatus that enables implementation of a desired steering torque without being affected by a state of a road surface by controlling a steering torque so as to become a value corresponding a steering angle and a steering angular velocity. The apparatus includes a SAT compensation value calculating section that calculates a SAT compensation value based on a SAT value; and a steering reaction compensation value calculating section that calculates a steering reaction compensation value based on the SAT compensation value, a steering angle and a steering angular velocity, and corrects the current command value by the steering reaction compensation value. Further, an electric power steering apparatus controls a twist angle of a torsion bar so as to follow a value corresponding to a steered angle.

Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that can accurately suppress a vibration, a noisy sound and so on whose vibration source is a power spectrum occurring from a relationship between an operation period of torque control and an operation period of current control, and which occur regardless of presence or absence of a mechanical resonance.

Abstract: An electric power steering apparatus that has a function to switch an assist mode and an automatic mode, and comprises a handle vibration removing section to cut off frequency components near a predetermined central frequency with reference to a target steering angle, a position control section to output a motor angular velocity command value, an integration section to integrate a deviation between the motor angular velocity command value and a motor angular velocity, a proportion section to input the motor angular velocity, and a velocity control section to output the motor current command value by subtracting an output of the proportion section from an output of the integration section, thereby to remove the vibration being caused by spring characteristics of a torsion bar and inertia moment of a steering wheel in the automatic mode.

Abstract: A tuning device of an electric power steering apparatus assisting steering based on the correspondence relationship between a steering torque and a steering auxiliary command value according to the steering torque. The tuning device receives a plurality of candidate points represented by a steering torque and a candidate value of the steering auxiliary command value according to the steering torque, calculates a high order polynomial approximating the plurality of candidate points, calculates a plurality of adjustment points, the number of which is larger than the plurality of candidate points and which are represented by the steering torque and the steering auxiliary command value according to the steering torque, based on the high order polynomial, calculates a plurality of linear functions connecting two adjacent points in the plurality of adjustment points, and outputs information on the plurality of linear functions in order to adjust the correspondence relationship.

Abstract: An electric power steering apparatus that achieves a desired steering characteristic in minutely steering at on-center, suppresses frictional feeling, and improves linear steering feeling at on-center, and a control apparatus that determines a parameter. The apparatus calculates a current command value by using an assist map related to a steering torque and a vehicle speed, drives a motor based on the current command value, and assists and controls a steering system.

Abstract: An electric power steering apparatus that can suppress deterioration of steering feeling by changing a current command value of a normal system in motor control by two systems when an abnormality occurs in any of the systems. The steering apparatus calculates a current command value to a motor having two-system motor windings for each system, comprises a current command value adjusting section that calculates the current command value by using a steering assist command value and a compensation current command value.

Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that can accurately suppress a vibration, a noisy sound and so on whose vibration source is a power spectrum occurring from a relationship between an operation period of torque control and an operation period of current control, and which occur regardless of presence or absence of a mechanical resonance.

Abstract: An electric power steering apparatus includes a torque control system to calculate a current command value and a current control system to control a motor current value passing through a motor based on the current command value. A first calculation period of the torque control system is equal to or longer than a second calculation period of the current control system. The current control system includes a specific frequency band removing section that attenuates a frequency component which multiplies at least one natural number by an approximate half of a calculation frequency of the torque control system to the current command value. The specific frequency band removing section includes notch filters that set an attenuation frequency or includes the notch filters and a phase delay filter that has a cutoff frequency, which is set to a lower frequency side than a frequency which is attenuated by the notch filters.

Abstract: An electric power steering apparatus that enables implementation of a desired steering torque without being affected by a state of a road surface by controlling a steering torque so as to become a value corresponding a steering angle and a steering angular velocity. The apparatus includes a SAT compensation value calculating section that calculates a SAT compensation value based on a SAT value; and a steering reaction compensation value calculating section that calculates a steering reaction compensation value based on the SAT compensation value, a steering angle and a steering angular velocity, and corrects the current command value by the steering reaction compensation value. Further, an electric power steering apparatus controls a twist angle of a torsion bar so as to follow a value corresponding to a steered angle.

Abstract: An electric power steering apparatus includes a steering angle control section that calculates a steering angle control current command value for the steering angle control, calculates the current command value using at least the steering angle control current command value; the steering angle control section includes a position control section that calculates a basic steering angular velocity command value, a steering intervention compensating section that obtains a compensatory steering angular velocity command value, and a steering angular velocity control section that calculates the steering angle control current command value by the basic steering angular velocity command value, the compensatory steering angular velocity command value and an actual steering angular velocity; the steering intervention compensating section includes a compensation gain section that multiplies the steering torque by a steering intervention compensation gain, and obtains the compensatory steering angular velocity command valu

Abstract: An electric power steering apparatus includes a torque control system to calculate a current command value and a current control system to control a motor current value passing through a motor based on the current command value. A first calculation period of the torque control system is equal to or longer than a second calculation period of the current control system. The current control system includes a specific frequency band removing section that attenuates a frequency component which multiplies at least one natural number by an approximate half of a calculation frequency of the torque control system to the current command value. The specific frequency band removing section includes notch filters that set an attenuation frequency or includes the notch filters and a phase delay filter that has a cutoff frequency, which is set to a lower frequency side than a frequency which is attenuated by the notch filters.

Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that performs a judgment of a manual input during an automatic steering control by an accurate and precise method based on the mechanical equation, and have a steering performance which a driver and a fellow passenger do not feel uncomfortable.

Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that performs a judgment of a manual input during an automatic steering control by an accurate and precise method based on the mechanical equation, and have a steering performance which a driver and a fellow passenger do not feel uncomfortable.

Abstract: An electric power steering apparatus that achieves a desired steering characteristic in minutely steering at on-center, suppresses frictional feeling, and improves linear steering feeling at on-center, and a control apparatus that determines a parameter. The apparatus calculates a current command value by using an assist map related to a steering torque and a vehicle speed, drives a motor based on the current command value, and assists and controls a steering system.

Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that suppresses a handle vibration (noisy sound) being caused by a handle inertia and a spring nature of a torsion bar and improves a steering feeling, without changing of the gain of the PI control. [Means for solving the problem] The present invention is an electric power steering apparatus that assist-controls a steering by driving a motor with a current command value calculated based on at least a steering torque, comprising a vibration-damping compensating section that calculates a vibration-damping compensation command value for suppressing a vibration of a handle based on a motor velocity of the motor, wherein the current command value is corrected by the vibration-damping compensation command value.