Abstract: A software processing device of a steering control device is configured to execute a sampling process, a turning angle calculation process, and a control constant learning process. The sampling process is a process of sampling a steering angle and a yaw rate in synchronization. The turning angle calculation process is a process of calculating a turning angle of the turning wheel, using the yaw rate and a vehicle velocity as inputs. The control constant learning process is a process of learning a control constant based on a plurality of combinations each of which is constituted by the steering angle sampled by the sampling process and the turning angle corresponding to the steering angle. The control constant is a constant that indicates a rotational displacement of the turning wheel with respect to a rotational displacement of the steering shaft.

Abstract: A steering control device controls a steering device. The steering device includes a processor configured to execute a dead band amount calculation process and a superposition process. The dead band amount calculation process is a process of calculating a dead band amount using a steering angle as an input, the dead band amount being an amount by which the steering angle changes while a turning wheel does not turn in a steering direction. The superposition process is a process of superposing a dead band compensation torque on the torque of a motor, when the magnitude of the dead band amount is larger than zero. The dead band compensation torque is a torque that increases the torque of the motor in a direction in which the turning wheel turns depending on rotation of a steering shaft.

Abstract: A toothed pulley includes a cylindrical metallic core and a resin portion including teeth. The metallic core has, at one end thereof in the axial direction, an outward flange projecting outward in the radial direction. The outward flange has a radially outer peripheral surface that is a rotation prevention shape having a plurality of parts displaced inward in the radial direction from a cylindrical surface of the radially outer peripheral surface. The radially outer peripheral surface of the outward flange is covered by the resin portion.

Abstract: A steering torque control process includes a process of calculating a manipulated variable for controlling steering torque to target steering torque by using a proportional element and a derivative element according to a difference between the steering torque and the target steering torque. At least one of the two elements, namely the proportional element and the derivative element, includes an enlarging phase controller. The enlarging phase controller is a controller that enlarges a degree to which a phase of the derivative element is advanced with respect to a phase of the proportional element.

Abstract: A gear manufacturing apparatus for machining a gear workpiece wherein, when at least one of end regions in a tooth trace direction of each tooth of the workpiece is machined, a control device executes a specific machining control for adjusting a relative position of a tool to the workpiece based on information about the relative position computed by setting, as a machining reference position, a position of the tool on an outer edge line in an X-axis-orthogonal cross section different from a normal machining point such that a distance between a center of the tool and a center of the gear workpiece in the X-axis-orthogonal cross section when the at least one of the end regions is machined is larger than when the at least one of the end regions is machined by setting the normal machining point as the machining reference position.

Abstract: A steering control system that controls a steering device of a vehicle includes a storage unit, and a control unit configured to make a state transition to a normal control state via a start-up state after a power source system of the vehicle is started. In the start-up state, the control unit executes a correction information storing process of acquiring correction element information using a state variable obtained from the steering device and writing correction information obtained based on the correction element information into the storage unit. In the start-up state, the control unit is configured to execute an abnormal condition determination process of determining whether an abnormal condition indicating that the correction information is abnormal is met. The correction information storing process is re-executed when the abnormal condition is met. The abnormal condition determination process is executed at least either before or after the correction information storing process.

Abstract: A management system for an experimental animal is provided. This management system includes an information identifying unit configured to identify experimental information on the experimental animal to be transported to an experiment site, and a stress value calculating unit configured to calculate a stress value indicating stress to be suffered by the experimental animal during transportation based on the experimental information. The experimental information includes at least a part of a transportation distance for the transportation of the experimental animal, a transportation period for the transportation of the experimental animal, the number of the experimental animals to be transported at a time, an age of the experimental animal, and information on pretreatment given to the experimental animal prior to the transportation.

Abstract: A grease composition includes a base oil, a thickener, and an extreme pressure additive. The base oil contains trimellitate ester and poly-a-olefin. A proportion of the trimellitate ester to a total amount of the trimellitate ester and the poly-a-olefin is 10.0 mass % or more and 60.0 mass % or less. The thickener contains lithium 12-hydroxystearate and lithium stearate. A proportion of the lithium 12-hydroxystearate to a total amount of the lithium 12-hydroxystearate and the lithium stearate is 5.0 mass % or more and 95.0 mass % or less. The extreme pressure additive contains molybdenum dialkyl dithiocarbamate. A proportion of the molybdenum dialkyl dithiocarbamate to a total amount of the trimellitate ester, the poly-a-olefin, the lithium 12-hydroxystearate, the lithium stearate, and the molybdenum dialkyl dithiocarbamate is 0.6 mass % or more and 16.0 mass % or less.

Abstract: A steering control device includes: a target steering corresponding value calculation unit that calculates a target steering corresponding value so that the ratio of the amount of change in steered angle to the amount of change in amount of operation of an operating member becomes greater than 1; a control signal generation unit that generates a control signal; and a mode switch unit that switches a control mode. The mode switch unit performs: an operation determination process of determining whether an operation condition for detecting a valid operation performed on the operating member by a driver is satisfied during an autonomous driving control mode; and a mode switching process of switching the control mode to a manual driving control mode when the operation condition is satisfied. The operation determination process includes a process of determining an unintended operation by the driver to be invalid.

Abstract: A motor control device includes: a manual steering command value generation unit that generates a manual steering command value; an integrated angle command value calculation unit that calculates an integrated angle command value by adding the manual steering command value to an automatic steering command value provided in a driver assist mode; and a control unit that performs angle control on an electric motor for steering angle control based on the integrated angle command value. The manual steering command value generation unit generates the manual steering command value based on an equation of motion including road reaction force characteristic coefficients. The motor control device further includes a road reaction force characteristic changing unit that changes a value of at least one of the road reaction force characteristic coefficients included in the equation of motion, based on vehicle environment information that is information on an environment in which a vehicle travels.

Abstract: A vehicle steering system has a power transmission path cut off between a steering unit that is steered by a steering wheel of a vehicle and a turning unit that operates to turn a turning wheel of the vehicle. A steering control device for the vehicle steering system includes a processor that controls operation of the turning unit. The processor executes a target turning angle calculation process of, based on a steering angle representing a rotation position of the steering wheel, calculating a target turning angle that is a target of a turning angle representing a turning position of the turning wheel and is a control amount for operating the turning unit.

Abstract: Method for compensating for a friction between at least two parts, the method being based on a friction model (M), a speed (v) between at least one part and at least one other part of the at least two parts, the speed being measured, or estimated from a measurement, the speed (v) being input data of the model (M), the model (M) being based on an internal state (z) of friction, a time derivative (?) of the internal state (z) being a function of said internal state and of the speed (v) and of a first gain (?), the method comprising a step of saturation of the speed v at the input of the friction model, so that an absolute value |v| of the speed (v) remains lower than a saturation value, the saturation value being a function of the speed, of the first gain and of a second gain.

Abstract: A steer-by-wire steering system includes a controller configured to execute a steering control process and a determining process of determining a converted operation amount by converting an actual wheel steering amount to an operation amount of an operation member based on an inverse of a steering gear ratio. In the determining process, when the steering gear ratio abruptly changes, the controller converts a gap of the converted operation amount generated at a time point of occurrence of the abrupt change to a gap of the wheel steering amount to grasp a converted steering amount offset value. While gradually decreasing the converted steering amount offset value, the controller thereafter re-converts the converted steering amount offset value to the gap of the converted operation amount based on the inverse of the steering gear ratio to determine a converted operation amount correction value and corrects the converted operation amount based on the value.

Abstract: A steering control device is configured to execute a torque control process, a feedback amount calculation process, and an automatic control calculation process. The torque control process is a process of controlling torque of the motor according to a value of a required torque variable. The required torque variable is a variable that indicates a target value for the torque of the motor. The feedback amount calculation process is a process of calculating a value of the required torque variable in order to control steering torque to target steering torque through feedback control.

Abstract: A steering system has a support tube that supports a steering shaft, and a housing that has a cylindrical portion housing a speed reducer. A bearing support member is fitted to an inner circumferential face of the cylindrical portion. A bearing is disposed between an outer circumferential face of the steering shaft and an inner circumferential face of the bearing support member. The bearing support member has an inner circumferential wall that fits to an outer circumferential face of the bearing, an outer circumferential wall that fits to the inner circumferential face of the cylindrical portion, and a coupling wall that couples the inner circumferential wall and the outer circumferential wall in a radial direction. The inner circumferential wall extends from the coupling wall in a same direction as a mounting direction, and the outer circumferential wall extends in an opposite direction from the mounting direction.

Abstract: A steering device that holds a steering member in such a manner that the steering member is movable between an advanced position where a driver can steer the steering member and a retracted position located closer to the front of a vehicle. The steering device includes: a fixed member attached to a vehicle body; a movable member to which a steering shaft holding the steering member is rotatably attached; and an upper guide mechanism and a lower guide mechanism that linearly guide the movable member with respect to the fixed member. An end on the advancing side of the upper guide mechanism is located further toward the advancing side than an end on the advancing side of the lower guide mechanism in an advancing and retracting direction of the movable member.

Abstract: A target motor torque command value setting unit includes a basic torque command value setting unit that sets a basic torque command value, a correction unit that corrects a basic target torque set by a basic target torque setting unit using resonance control torque, and a motor torque command value computation unit that computes a motor torque command value based on the basic target torque following correction by the correction unit. The resonance control torque is a sum of a first torque obtained by multiplying a differential value of steering torque by a predetermined first gain, and a second torque obtained by multiplying the steering torque by a predetermined second gain.

Abstract: A ball screw having a threaded stem including a ball groove formed in an outer surface thereof, a ball nut including a central bore formed by an inner surface thereof, the inner surface defining a ball groove, a first recess extending inwardly from an end face of the ball nut and into the ball groove of the inner surface, and a stop pin disposed in the first recess so that a first end of the stop pin extends inwardly into the ball groove of the inner surface of the ball nut, wherein the stop pin is formed by a coiled strip of metal.

Abstract: A hollow profile-manufacturing extrusion die includes a mandrel that molds an inner peripheral surface of a hollow part, and bridges for supporting the mandrel. The mandrel is disposed so as to correspond to a die hole that molds an outer peripheral surface of the hollow profile. The bridges are disposed at positions corresponding to between the hollow part and side surfaces in the hollow profile, and are not present at positions corresponding to between the hollow part and a lower surface.