Abstract: A flow control method is a flow control method of controlling flow around a blade of a rotary wing, a plasma actuator being disposed at the blade. The flow control method includes: determining a characteristic frequency ratio that is a characteristic value among frequency ratios, each of the frequency ratios being a ratio between an actuator driving frequency and an angle of attack changing frequency, the actuator driving frequency being a frequency of an applied voltage applied to the plasma actuator, the angle of attack changing frequency being a frequency at which an angle of attack of the blade changes in accordance with a rotation angle of the blade; setting the actuator driving frequency such that the frequency ratio becomes the characteristic frequency ratio; and applying a voltage of the set actuator driving frequency to the plasma actuator to control the flow around the blade.

Abstract: A flow control method is a flow control method of controlling flow around a blade of a rotary wing, a plasma actuator being disposed at the blade. The flow control method includes: determining a characteristic frequency ratio that is a characteristic value among frequency ratios, each of the frequency ratios being a ratio between an actuator driving frequency and an angle of attack changing frequency, the actuator driving frequency being a frequency of an applied voltage applied to the plasma actuator, the angle of attack changing frequency being a frequency at which an angle of attack of the blade changes in accordance with a rotation angle of the blade; setting the actuator driving frequency such that the frequency ratio becomes the characteristic frequency ratio; and applying a voltage of the set actuator driving frequency to the plasma actuator to control the flow around the blade.

Abstract: Provided is a motor control device capable of suppressing a sudden change in torque due to spike noise. A control device (motor control device) continues motor control using dq-axis current command values Id* and Iq* (current command values) or dq-axis detection current values real_Id and real_Iq before detecting a noise state (detection current values before a current supplied to a motor suddenly changes) instead of dq-axis detection current values real_Id and real_Iq (latest detection current values) when the current changes suddenly.

Abstract: A flow control method is a flow control method of controlling flow around a blade of a rotary wing, a plasma actuator being disposed at the blade. The flow control method includes: determining a characteristic frequency ratio that is a characteristic value among frequency ratios, each of the frequency ratios being a ratio between an actuator driving frequency and an angle of attack changing frequency, the actuator driving frequency being a frequency of an applied voltage applied to the plasma actuator, the angle of attack changing frequency being a frequency at which an angle of attack of the blade changes in accordance with a rotation angle of the blade; setting the actuator driving frequency such that the frequency ratio becomes the characteristic frequency ratio; and applying a voltage of the set actuator driving frequency to the plasma actuator to control the flow around the blade.

Abstract: To appropriately limit a current output from an inverter to a motor according to a state of a cooling mechanism that cools the motor and the inverter. A motor control unit includes a current command unit configured to calculate current command values (Id*, Iq*) for determining a current to be output to a motor on the basis of an input torque command, a motor lock determination unit configured to determine whether the motor is in a locked state on the basis of a motor rotation speed Nrpm indicating a rotation state of the motor, and a torque command limitation unit configured to limit the current to be output to the motor by limiting the torque command on the basis of a cooling water temperature Tc indicating a state of the cooling mechanism in a case where the motor lock determination unit determines that the motor is in the locked state.

Abstract: Provided is a motor control device capable of suppressing a sudden change in torque due to spike noise. A control device (motor control device) continues motor control using dq-axis current command values Id* and Iq* (current command values) or dq-axis detection current values real_Id and real_Iq before detecting a noise state (detection current values before a current supplied to a motor suddenly changes) instead of dq-axis detection current values real_Id and real_Iq (latest detection current values) when the current changes suddenly.

Abstract: To appropriately limit a current output from an inverter to a motor according to a state of a cooling mechanism that cools the motor and the inverter. A motor control unit includes a current command unit configured to calculate current command values (Id*, Iq*) for determining a current to be output to a motor on the basis of an input torque command, a motor lock determination unit configured to determine whether the motor is in a locked state on the basis of a motor rotation speed Nrpm indicating a rotation state of the motor, and a torque command limitation unit configured to limit the current to be output to the motor by limiting the torque command on the basis of a cooling water temperature Tc indicating a state of the cooling mechanism in a case where the motor lock determination unit determines that the motor is in the locked state.

Abstract: A motor control system can suppress production costs, suppress the occurrence of unexpected excessive torque, and continue system operation as much as possible even when the diagnosis results of a monitoring device are abnormal. A computation device computes a voltage command value indicating the voltage to impose on a motor. Based on the voltage command value, the computation device generates a control signal that controls a drive device. When the diagnosis results of the monitoring device are normal, the computation device computes the voltage command value so that the absolute value of the detection value of current flowing to the motor is no greater than a second threshold, and when the diagnosis results of the monitoring device are abnormal, the computation device computes the voltage command value so that this absolute value is no greater than a third threshold that is smaller than the second threshold.

Abstract: Provided is a motor control system that can suppress production costs and suppress the occurrence of unexpected excessive torque, and continues system operation as much as possible even when the diagnosis results of a monitoring device are abnormal. A computation device (3) computes a voltage command value indicating the voltage to impose on a motor (2), and, on the basis of the voltage command value, generates a control signal (Spwm) that controls a drive device (5).

Abstract: If the control of a motor becomes impossible, the motor appropriately stops, and drive wheels are driven by an engine to enable retraction travel. A motor/generator 4 is used to drive drive wheels of a vehicle, and start an engine 3. A motor controller 22 implements a first control mode for controlling the motor/generator 4 on the basis of a command from an integrated controller 20 if a CAN communication with the integrated controller 20 is normal. The motor controller 22 implements a second control mode for controlling the motor/generator 4 on the basis of control information stored in advance to allow the motor/generator 4 to start the engine 3 when the engine 3 is in stop if the CAN communication with the integrated controller 20 is abnormal.

Abstract: Engine control unit enabling to learn a change of relationship between a throttle opening degree and an intake air quantity (opening degree—air quantity characteristic) while restricting lowering of fuel efficiency to a minimum and to improve accuracy of engine stall prevention, torque control, including: a learning means which learns a characteristic change amount of the opening degree—air quantity characteristic; a learning requirement determining means; and a learning moving means causing executing learning in a stable driving state. The learning requirement determining means derives a separation amount between an intake air quantity corresponding to a throttle valve opening degree at present time and an actual intake air quantity detected in the stable driving state and determines requirement of learning with use of the separation amount and a threshold value.

Abstract: Provided is an engine control unit which is capable of determining whether or not a sudden change in ETC characteristic has occurred, timely learning the ETC characteristic, and thus suppressing excessive racing of an engine and enhancing torque realizing accuracy thereof, at a time other than the opportunity of a regular air quantity learning in a vehicle having no idle state or a less frequent opportunity of the idle state.

Abstract: There are provided a new visible ray reflection plate capable of making the light from a lighting device and an electric/electronic device emitting a light signal brighter and an electric/electronic device using the new visible ray reflection plate. The visible ray reflection plate 1 includes a white resin sheet 5 superimposed on a metal plate 3 which may be plated wherein the area ratio of air bubbles existing at the boundary between the white resin sheet 5 and the metal plate 3 which may be plated is not greater than 5%. Alternatively, the visible ray reflection plate 1 includes a white resin sheet 5? having a visible ray diffuse reflectance of 0.07 or above at the surface of 555 nm and infrared total radiation ratio 0.60 or above at the area of the wave number 600 to 3000 cm?1 measured at a predetermined temperature from 80 degrees C. to 200 degrees C. which resin sheet is arranged on one side of the metal plate 3 which may be plated.