Abstract: An electric power steering apparatus includes: a torque sensor configured to detect a steering torque of a driver; a motor configured to assist in a steering force of the driver; a rotation angle estimation unit configured to estimate a rotation angle of the motor to output an estimated angle; a correction signal calculation unit configured to calculate a correction signal based on the steering torque; a frequency separation unit configured to separate the estimated angle into a first frequency component and a second frequency component; an estimated angle correction unit configured to calculate, as a control angle, a value obtained by adding a second-frequency-component corrected signal, which is obtained by correcting the second frequency component based on the correction signal, to the first frequency component; and an electric power supply unit configured to supply electric power to the motor based on the control angle.

Abstract: An electric power steering apparatus including: a steering torque detector to detect a steering torque of a driver; a motor to assist a steering force of the driver; an estimated speed calculator to calculate an estimated speed, which is an estimated value of a rotation speed of the motor; an estimated speed corrector to correct the estimated speed based on the steering torque; an estimated angle calculator to calculate an estimated angle of the motor by integrating the estimated speed after the correction; and an electric power supply to supply electric power to the motor based on the estimated angle, wherein the estimated speed corrector corrects the estimated speed when a determination signal, which is based on a value obtained by removing a frequency component of steering of the driver from a derivative of the steering torque, the steering torque, and the estimated speed have the same signs.

Abstract: A shortening of an initial diagnosis time is achieved, even after an elapse of a predetermined delay time from an ignition switch being switched to an off-state. After the ignition switch is switched to an off-state after an operation of a control device, which drives an electric motor that applies steering assistance force to a steering system, diagnosis of a power supply circuit that supplies power to the control device is carried out, and a diagnosis item to be implemented in a succeeding initial diagnosis is determined based on a result of the diagnosis.

Abstract: An electric power steering apparatus including: a steering torque detector to detect a steering torque of a driver; a motor to assist a steering force of the driver; an estimated speed calculator to calculate an estimated speed, which is an estimated value of a rotation speed of the motor; an estimated speed corrector to correct the estimated speed based on the steering torque; an estimated angle calculator to calculate an estimated angle of the motor by integrating the estimated speed after the correction; and an electric power supply to supply electric power to the motor based on the estimated angle, wherein the estimated speed corrector corrects the estimated speed when a determination signal, which is based on a value obtained by removing a frequency component of steering of the driver from a derivative of the steering torque, the steering torque, and the estimated speed have the same signs.

Abstract: An electric power steering apparatus includes: a torque sensor configured to detect a steering torque of a driver; a motor configured to assist in a steering force of the driver; a rotation angle estimation unit configured to estimate a rotation angle of the motor to output an estimated angle; a correction signal calculation unit configured to calculate a correction signal based on the steering torque; a frequency separation unit configured to separate the estimated angle into a first frequency component and a second frequency component; an estimated angle correction unit configured to calculate, as a control angle, a value obtained by adding a second-frequency-component corrected signal, which is obtained by correcting the second frequency component based on the correction signal, to the first frequency component; and an electric power supply unit configured to supply electric power to the motor based on the control angle.

Abstract: A shortening of an initial diagnosis time is achieved, even after an elapse of a predetermined delay time from an ignition switch being switched to an off-state. After the ignition switch is switched to an off-state after an operation of a control device, which drives an electric motor that applies steering assistance force to a steering system, diagnosis of a power supply circuit that supplies power to the control device is carried out, and a diagnosis item to be implemented in a succeeding initial diagnosis is determined based on a result of the diagnosis.

Abstract: An electric power steering control device, in which a control response capability in a low speed region can be improved, and a noise and a vibration can be suppressed, is provided. Although a control amount setter of the electric power steering control device performs a PI control computing in accordance with a deviation between a target current and an actual current, the control amount setter includes a gain setter which varies a gain of a proportion term in accordance with the deviation and a vehicle speed, and a control amount is computed in an integration term by using a predetermined constant gain.

Abstract: An electric power steering control device, in which a control response capability in a low speed region can be improved, and a noise and a vibration can be suppressed, is provided. Although a control amount setting means of the electric power steering control device performs a PI control computing in accordance with a deviation between a target current and an actual current, the control amount setting means includes a gain setting means 12 which varies a gain of a proportion term in accordance with the deviation and a vehicle speed, and a control amount is computed in an integration term by using a predetermined constant gain.

Abstract: A method for producing film-coated alkaline-earth metal silicate phosphor particles that can have improved light-emitting characteristics may include a coating film having high moisture resistance. Strontium-containing alkaline-earth metal silicate phosphor particles are pretreated with an alkaline-earth metal compound solution whose strontium compound concentration is 1 to 15% by mass with respect to the phosphor particles and whose pH is 6 or higher but 10 or lower. Then, a base layer of an aluminum organic metal compound is formed on the surface of the pretreated phosphor particles. Then, the phosphor particles are coated with a coating material composed of a partially-hydrolyzed condensate of a silane organic metal compound, and are then dried and heat-treated to form, on their surface, a coating film made of an amorphous inorganic compound mainly containing Si and O.

Abstract: Provided is a control device for an electric power steering device, the control device configured to control an output torque of a motor that provides an assist torque to a steering torque, the output being controlled based on a steering-torque signal from a torque sensor that detects a steering torque, the control device controls the output torque using a correction signal to damp a vibration at a natural frequency determined in accordance with a transfer characteristic from the steering-torque signal to the output torque.

Abstract: A control device for an AC rotating machine includes a voltage command calculation means (1) that calculates voltage commands on rotation two axes and a voltage applying means (2) that applies a voltage to an AC rotating machine (3), based on voltage commands on the rotation two axes outputted by the voltage command calculation means (1); the voltage command calculation means (1) calculates first-axis and second-axis voltage commands on the rotation two axes and reduces the limit value of the second-axis voltage command in proportion to the squared first-axis voltage command.

Abstract: A main control device generates a first signal and a second signal, which is substantially equivalent to the first signal, in accordance with the input signal, a sub-control device includes a comparison-judgment-processing unit that compares the first signal with the second signal, and judges that an abnormality occurs when a state, in which a deviation between the both signals is greater than equal to a predetermined value, is continued in a time being equal to a first predetermined time, and a limitation unit is configured in such a way that the limitation unit adds a predetermined limitation to the output of the main control device in accordance with a result for which the comparison-judgment-processing unit judges that the abnormality occurs.

Abstract: Disclosed herein is a method for producing film-coated alkaline-earth metal silicate phosphor particles that have a coating film having high moisture resistance and water resistance and that can have improved light-emitting characteristics. Strontium-containing alkaline-earth metal silicate phosphor particles are pretreated with an alkaline-earth metal compound solution whose strontium compound concentration is 1 to 15% by mass with respect to the phosphor particles and whose pH is 6 or higher but 10 or lower. Then, a base layer of an aluminum organic metal compound is formed on the surface of the pretreated phosphor particles. Then, the phosphor particles are coated with a coating material composed of a partially-hydrolyzed condensate of a silane organic metal compound, and are then dried and heat-treated to form, on their surface, a coating film made of an amorphous inorganic compound mainly containing Si and O.

Abstract: A control device for an AC rotating machine includes a voltage command calculation means (1) that calculates voltage commands on rotation two axes and a voltage applying means (2) that applies a voltage to an AC rotating machine (3), based on voltage commands on the rotation two axes outputted by the voltage command calculation means (1); the voltage command calculation means (1) calculates first-axis and second-axis voltage commands on the rotation two axes and reduces the limit value of the second-axis voltage command in proportion to the squared first-axis voltage command.

Abstract: Provided is a control device for an electric power steering device, for controlling an output torque of a motor for outputting an assist torque based on a steering-torque signal from a torque sensor for detecting a steering torque, the control device for negatively feeding back a correction signal based on a motor-speed signal from motor-speed detection means for detecting a rotation speed of a rotary shaft of the motor to damp a vibration at a natural frequency determined in accordance with a transfer characteristic from the steering-torque signal to the output torque.

Abstract: An electric power steering apparatus is provided that has a controller by which no current flows in one phase among current paths of three phases for supplying electric power from a motor driving circuit to a three-phase brushless motor and currents that have an identical absolute value and that have different signs flow in the other two phases. Thus, the status at one energization angle on the driving current waveform of the three-phase brushless motor can be given continuously and relatively-high currents can simultaneously flow in opposite directions in the contacts inserted to the two phases. By flowing of such high current in the contacts, a secure conduction check can be performed and foreign matters on the surface of the contact can be fused or thermally destroyed.

Abstract: A main control device generates a first signal and a second signal, which is substantially equivalent to the first signal, in accordance with the input signal, a sub-control device includes a comparison-judgment-processing unit that compares the first signal with the second signal, and judges that an abnormality occurs when a state, in which a deviation between the both signals is greater than equal to a predetermined value, is continued in a time being equal to a first predetermined time, and a limitation unit is configured in such a way that the limitation unit adds a predetermined limitation to the output of the main control device in accordance with a result for which the comparison-judgment-processing unit judges that the abnormality occurs.

Abstract: In an electric power steering apparatus including a capacitor for smoothing out the voltage of a battery and a relay including a relay contact disposed at a place upstream of the capacitor, a path is provided for directly conducting a terminal voltage of the capacitor from a downstream side of the relay contact to a system power supply that generates a source voltage for a control system including a controller and the like, so that the system power supply and the control system that is supplied therefrom with electric power for control purpose are utilized as a discharge circuit. Thus is obtained a simplified configuration of circuit responsible for discharging the capacitor.

Abstract: In an electric power steering apparatus including capacitor for smoothing out the voltage of battery and relay including a relay contact disposed at a place upstream of the capacitor, a path is provided for directly conducting a terminal voltage of the capacitor from a downstream side of the relay contact to a system power supply supply that generates a source voltage for a control system including controller and the like, so that the system power supply and the control system that is supplied therefrom with electric power for control purpose are utilized as a discharge circuit. Thus is obtained a simplified configuration of circuit responsible for discharging the capacitor.

Abstract: An electric power steering apparatus is provided that has a controller by which no current flows in one phase among current paths of three phases for supplying electric power from a motor driving circuit to a three-phase brushless motor and currents that have an identical absolute value and that have different signs flow in the other two phases. Thus, the status at one energization angle on the driving current waveform of the three-phase brushless motor can be given continuously and relatively-high currents can simultaneously flow in opposite directions in the contacts inserted to the two phases. By flowing of such high current in the contacts, a secure conduction check can be performed and foreign matters on the surface of the contact can be fused or thermally destroyed.