Abstract: An electric power steering apparatus includes a driving target value setting unit for setting a driving target value of an electric motor; a steering acceleration detecting unit for detecting or estimating a steering acceleration; a correction amount computing unit for computing a control correction amount in accordance with the steering acceleration; a vehicle acceleration detecting unit for detecting an acceleration of a motor vehicle; an acceleration adaptive gain setting unit for setting a gain in accordance with an acceleration of a motor vehicle; a multiplication unit for determining a gain adjusted control correction amount by multiplying the control correction amount with the acceleration adaptive gain; a correcting unit for correcting the driving target value on the basis of the gain adjusted control correction amount; and motor driving units for driving the electric motor on the basis of the corrected driving target value.

Abstract: A motor drive circuit (43) outputs a voltage corresponding to a duty ratio of a PWM signal, to an assist motor (30) by controlling electric power supplied from a direct-current power supply (Batt) through PWM. When an MPU (41) that controls the motor drive circuit (43) determines that a determination current value (Ij) obtained by adding a shaft force correction current value (In) to a motor current (I) exceeds a current threshold value (It), the MPU (41) decreases the duty ratio of a low-voltage switching element of the motor drive circuit (43) by multiplying the duty ratio by a duty limit value (Gd). When the MPU (41) performs the determination, the MPU (41) increases the shaft force correction current value (In) based on the vehicle speed (V) of the vehicle.

Abstract: An electric power steering apparatus includes a driving target value setting unit for setting a driving target value of an electric motor; a steering acceleration detecting unit for detecting or estimating a steering acceleration; a correction amount computing unit for computing a control correction amount in accordance with the steering acceleration; a vehicle acceleration detecting unit for detecting an acceleration of a motor vehicle; an acceleration adaptive gain setting unit for setting a gain in accordance with an acceleration of a motor vehicle; a multiplication unit for determining a gain adjusted control correction amount by multiplying the control correction amount with the acceleration adaptive gain; a correcting unit for correcting the driving target value on the basis of the gain adjusted control correction amount; and motor driving units for driving the electric motor on the basis of the corrected driving target value.

Abstract: The electric power steering apparatus includes an operation amount detecting unit arranged to detect an operation amount of an operation member for steering a motor vehicle; a reference assist characteristics setting unit arranged to set reference assist characteristics which are reference characteristics of a motor driving target value corresponding to the operation amount of the operation member; a motor driving target value setting unit arranged to set a motor driving target value in accordance with corrected assist characteristics obtained by shifting the reference assist characteristics along an axis of coordinates of the operation amount; a yaw rate detecting unit arranged to detect or estimate a yaw rate of the motor vehicle; and a shifting amount setting unit arranged to set a shifting amount of the corrected assist characteristics with respect to the reference assist characteristics corresponding to the yaw rate of the motor vehicle.

Abstract: An electric power steering apparatus transmits a driving force of an electric motor to a steering mechanism for steering assist. The apparatus includes a torque sensor which detects a steering wheel torque; a basic assist characteristic determining section which determines a basic assist characteristic defining a basic characteristic of a motor driving target value for the steering torque; a motor driving target value determining section which determines the motor driving target value for the steering torque in accordance with a modified assist characteristic prepared by shifting the basic assist characteristic along a steering torque coordinate axis; a shift amount determining section which determines the amount of the shift from the basic assist characteristic to the modified assist characteristic on the basis of the steering torque; and a motor driving section which drives the electric motor on the basis of the motor driving target value.

Abstract: The present invention provides an electric power steering device enabled to compensate for the influence of the inertia of a steering-assisting-force generating motor on steering with accurate timing even when a steering direction is reversed at high speed. Based on steering torque and a rotation angular speed of a steering-assisting-force generating motor, a steering angular acceleration correspondence value is obtained. The device has means for regulating a gain, which is multiplied to a change acceleration of the steering torque. The motor is controlled so that the steering assisting force is corrected according to a motor output correction value obtained on the basis of the relation between the motor output correction value and the steering angular acceleration correspondence value, which is preliminarily determined and stored in such a way as to compensate for the influence of the inertia on steering, and the obtained steering angular acceleration correspondence value.

Abstract: An electric power steering apparatus which transmits a driving force of an electric motor to a steering mechanism for steering assist. The apparatus is provided with: a torque sensor which detects a steering torque applied to an operation member for steering a vehicle; a basic assist characteristic determining section which determines a basic assist characteristic defining a basic characteristic of a motor driving target value for the steering torque; a motor driving target value determining section which determines the motor driving target value for the steering torque in accordance with a modified assist characteristic prepared by shifting the basic assist characteristic along a steering torque coordinate axis; a shift amount determining section which determines the amount of the shift from the basic assist characteristic to the modified assist characteristic on the basis of the steering torque; and a motor driving section which drives the electric motor on the basis of the motor driving target value.

Abstract: An electric power steering apparatus for performing steering assist. The apparatus is provided with an operation amount sensor for sensing an operation amount of an operation member for steering a motor vehicle; a reference assist characteristics setting section for setting reference assist characteristics; and a motor driving target value setting section for setting a motor driving target value in accordance with a corrected assist characteristics obtained by shifting the reference assist characteristics along the axis of coordinates of the operation amount. The apparatus is further provided with a shifting amount setting section for setting, when forward stroke steering is done, the shifting amount to zero, while setting, when return stroke steering is done, the shifting amount to a value at which corrected assist characteristics is obtained in which the absolute value of the motor driving target value corresponding to the operation amount is increased.

Abstract: An electric power steering apparatus for performing steering assist. The apparatus is provided with an operation amount sensor for sensing an operation amount of an operation member for steering a motor vehicle; a reference assist characteristics setting section for setting reference assist characteristics; and a motor driving target value setting section for setting a motor driving target value in accordance with a corrected assist characteristics obtained by shifting the reference assist characteristics along the axis of coordinates of the operation amount. The apparatus is further provided with a shifting amount setting section for setting, when forward stroke steering is done, the shifting amount to zero, while setting, when return stroke steering is done, the shifting amount to a value at which corrected assist characteristics is obtained in which the absolute value of the motor driving target value corresponding to the operation amount is increased.

Abstract: The present invention provides an electric power steering device enabled to compensate for the influence of the inertia of a steering-assisting-force generating motor on steering with accurate timing even when a steering direction is reversed at high speed. Based on steering torque and a rotation angular speed of a steering-assisting-force generating motor, a steering angular acceleration correspondence value is obtained. The device has means for regulating a gain, which is multiplied to a change acceleration of the steering torque. The motor is controlled so that the steering assisting force is corrected according to a motor output correction value obtained on the basis of the relation between the motor output correction value and the steering angular acceleration correspondence value, which is preliminarily determined and stored in such a way as to compensate for the influence of the inertia on steering, and the obtained steering angular acceleration correspondence value.

Abstract: An object of the present invention is to provide an optical disk reproducing method and apparatus which allows for influence on focus servo control and tracking servo control involved in outputting voice information. The optical disk reproducing apparatus includes an optical pickup, a tracking servo control for causing the optical pickup to trace a track on the optical disk, a focus servo control and a pair of speakers for outputting reproduced voice information to the outside. When an information determining unit determines that the reproduced information includes voice information, the tracking servo control and the focus servo control are operated so as to provide a servo characteristic suitable for reproduction of voice information by the speakers to thereby reproduce information in the optical disk.

Abstract: A small-sized printer includes a printing section equipped with a shuttle head in which impact-type printing units are arranged in juxtaposition in a sub-scanning direction, a cylindrical cam for reciprocating the shuttle head in the sub-scanning direction, and paper feeding rollers for feeding a standard sheet in a main scanning direction; an input device for inputting information; a display device for displaying information; a RAM for storing information; and a CPU for controlling the printing section, the input section, the display device and the RAM and performing calculation on information. The printing section and the paper feeding rollers are provided in a body case in such a way as to be exposed where they are opposed to a case cover, which has a flat platen and spring members at positions opposed to the printing section, and ribs adapted to come into contact with the standard sheet and serving as a positioning device and as a sliding guide.