Patent application number | Description | Published |
20100204889 | ELECTRIC POWER STEERING SYSTEM DESIGNED TO GENERATE TORQUE FOR ASSISTING DRIVER'S TURNING EFFORT - In an electric power steering system installed in a vehicle and designed to generate, by a motor, assist torque for assisting the driver's turning effort of the steering wheel, a self-aligning torque determiner determines a value of self aligning torque applied to the vehicle. A commanded-value generator determines a value of an assist ratio based on a predetermined relationship between a variable of the self aligning torque and a variable of the assist ratio. The assist ratio represents a ratio of share of torque by the motor for compensating the self aligning torque. The commanded-value generator generates, based on the self aligning torque and the value of the assist ratio, a commanded value for the assist torque. An assist torque determiner determines the assist torque based on the commanded value for the assist torque generated by the commanded-value generator. | 08-12-2010 |
20100228441 | ELECTRIC POWER STEERING SYSTEM DESIGNED TO GENERATE TORQUE FOR ASSISTING DRIVER'S TURNING EFFORT - In a steering system, a generator generates a first commanded value for assist torque, and a converter converts a second commanded value for the assist torque to a commanded current value. A current controller controls a drive current for driving a motor for generating the assist torque. A characteristic limiter is functionally interposed between a commanded-value generator and a converter, and limits, to a preset characteristic range, a characteristic of a functional downstream of the converter in the steering system. The functional downstream of the converter in the steering system includes a steering mechanism including the motor. The commanded-value generator inputs, to the characteristic limiter, the first commanded value. The characteristic limiter determines the second commanded current value for the assist torque based on the characteristic of the functional downstream and the first commanded value. | 09-09-2010 |
20100292896 | Control apparatus for electric power steering system - The control apparatus for an electric power steering system is designed to satisfy the first spec that a first relation characteristic between speed of the electric motor to generate steering assist force and the steering wheel torque is the same as a basic relation characteristic in which the electric motor is driven in accordance with a basic assist amount calculated on the basis of the measured steering torque not corrected by an assist compensation amount calculated depending on the operating state of the electric power steering system, and to satisfy the second spec that a second relation characteristic between speed of the electric motor and a road surface reaction force is such that speed of the electric motor is suppressed compared to a case where the electric motor is driven in accordance with the basic relation characteristic. | 11-18-2010 |
Patent application number | Description | Published |
20120240405 | MANUFACTURING METHOD FOR TOOTHED PART AND MANUFACTURING DEVICE FOR TOOTHED PART - A manufacturing method for a toothed part including a bottom surface portion and a side wall portion provided to extend upright from an outer peripheral end portion of the bottom surface portion, the side wall portion being fanned with teeth. The manufacturing method includes a half drawing process of performing draw shaping on a material having a disk shape to form the bottom surface portion and the side wall portion, an inside diameter of which becomes larger in a direction away from the bottom surface portion; and a tooth shaping process of forming the teeth in the side wall portion. | 09-27-2012 |
20120297910 | DRIVE PLATE AND MANUFACTURING METHOD FOR THE SAME - A drive plate includes a disk-shaped plate portion; and a tooth-shaped portion formed at an outer peripheral end of the plate portion. The plate portion and the tooth-shaped portion are integrally shaped from a single steel plate material. The plate portion and the tooth-shaped portion include a carburized layer provided over an entire surface layer of the plate portion and the tooth-shaped portion, the carburized layer having a carbon concentration higher than that of a center portion of the plate portion and the tooth-shaped portion in a thickness direction. The carburized layer of the plate portion is higher in hardness than the center portion of the plate portion in the thickness direction. The carburized layer of the tooth-shaped portion has been subjected to a quenching process, and is further higher in hardness than the carburized layer of the plate portion. | 11-29-2012 |
20130318792 | MANUFACTURING METHOD FOR TOOTHED MEMBER, MANUFACTURING DEVICE FOR TOOTHED MEMBER, AND TOOTHED MEMBER - A manufacturing method for a toothed member includes a thickened tooth shaping process in which a toothed shape is formed on a side wall portion while making a thickness of the side wall portion larger than a thickness of a bottom surface portion by relatively moving the compression die with respect to the restraint die and the pressure receiving member in the axial direction from the side of the opening end of the cup-shaped raw material toward the bottom surface portion. The manufacturing method being such that the thickened tooth shaping process includes applying a load against the restraint die such that the restraint die restrains the first surface and the second surface. | 12-05-2013 |
20140000334 | MANUFACTURING DEVICE FOR DRIVE PLATE AND MANUFACTURING METHOD FOR DRIVE PLATE | 01-02-2014 |