266results about "Internal feedback arrangements" patented technology

The invention discloses an intelligent wheel chair control method based on a brain-computer interface and an automatic driving technology. The method comprises the following steps: obtaining current pictures by a network camera to position a barrier; generating a candidate destination by the information of the barrier, and a track point for planning a path; automatically positioning a wheel chair; selecting the destination by a user through the brain-computer interface; planning the optimal path by combining the track point and by using the current position of the wheel chair as the starting point and the destination selected by the user as the end point; calculating the position difference between the current position of the wheel chair and the optimal path to be used as the feedback of a PID path tracking algorithm; calculating the reference angular speed and the reference linear speed according to the PID path tracking algorithm to be incorporated into a PID movement controller, converting mileage data into current angular speed and linear speed information to be used as the feedback of the PID movement controller, and controlling the wheel chair in a real-time way to drive to the destination. For the method, the mental burden of a user is greatly relieved, the method can adapt to various environments, and the self-care ability of a paralytic patient with serious illness is improved.

A non-linear, semi-parametric neural network-based adaptive filter is utilized to determine the dynamic speed of a rotating rotor within an induction motor, without the explicit use of a speed sensor, such as a tachometer, is disclosed. The neural network-based filter is developed using actual motor current measurements, voltage measurements, and nameplate information. The neural network-based adaptive filter is trained using an estimated speed calculator derived from the actual current and voltage measurements. The neural network-based adaptive filter uses voltage and current measurements to determine the instantaneous speed of a rotating rotor. The neural network-based adaptive filter also includes an on-line adaptation scheme that permits the filter to be readily adapted for new operating conditions during operations.

A servo motor for driving a die is provided with position and speed detectors. Further, a pressure sensor for detecting the pressure applied to a workpiece is provided. In the servo motor control unit, the smaller one of the speed command obtained by feedback control of the position and the speed command obtained by the pressure feedback control is selected as an output of a comparator. Based on the speed command output from the comparator, feedback control of the speed is performed and the servo motor is driven. In the state where the die does not press against the workpiece, a pressure error is large, the speed command by pressure control becomes large, and the speed command by position control becomes small. Therefore, position control is performed. When the workpiece is pressed, the position error increases, and the pressure error decreases, a speed command by pressure control is employed and pressure control is performed.

When either a command value or an actually measured value is appropriately selected as an angular velocity used for the frictional torque calculation, the frictional compensation can be made valid at all times in both the case in which a robot is actively operated according to an angular velocity command and the case in which the robot is passively operated being pushed by an external force. In the case where a motor rotating direction and a collision direction are reverse to each other after a collision has been detected, the control mode is switched from the positional control to the electric current control and a torque, the direction of which is reverse to the direction of the motor rotation is generated by the motor, so that the motor rotating speed can be reduced and the collision energy can be alleviated. After that, when the motor rotating speed is reduced to a value not more than the setting value, the control mode is switched to the compliance control and the distortion caused in a reduction gear is dissolved. On the other hand, in the case where the motor rotating direction and the collision direction are the same, the control mode is directly switched from the positional control to the compliance control without passing through the electric current control. When the robot is operated whole following a collision force, the collision force can be alleviated.