689 results about "Position control system" patented technology

An encoder-type measurement system is configured to measure a position dependent signal of a movable object, the measurement system including at least one sensor mountable on the movable object a sensor target object mountable on a substantially stationary frame, and a mounting device configured to mount the sensor target object on the substantially stationary frame. The measurement system further includes a compensation device configured to compensate movements and/or deformations of the sensor target object with respect to the substantially stationary frame. The compensation device may include a passive or an active damping device and/or a feedback position control system. In an alternative embodiment, the compensation device includes a gripping device which fixes the position of the sensor target object during a high accuracy movement of the movable object.

A position control system for a substrate support of a lithographic apparatus includes a position measurement system configured to determine a position of a sensor or sensor target on the substrate support, a controller configured to provide a control signal based on a desired position of a target portion of the substrate and the determined position, and one or more actuators configured to act on the substrate support. The position control system includes a stiffness compensation model of the substrate support, the stiffness compensation model including a relation between a difference in a change in position of the target portion and a change in position of the sensor or sensor target as a result of a force exerted on the substrate support. The position control system is configured to substantially correct at least during projection of a patterned radiation beam on the target portion, the position of the target portion using the stiffness compensation model.

Positional information of a movement plane of a wafer stage is measured using an encoder system such as, for example, an X head and a Y head, and the wafer stage is controlled based on the measurement results. At the same time, positional information of the wafer stage is measured using an interferometer system such as, for example, an X interferometer and a Y interferometer. When abnormality of the encoder system is detected or when the wafer stage moves off from a measurement area of the encoder system, drive control is switched to a drive control based on the measurement results of the interferometer system. Accordingly, drive control of the wafer stage can be performed continuously in the entire stroke area, even at the time when abnormality occurs in the encoder system.

Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator. A drive is connected to the phase windings for energizing the windings. A controller outputs a control signal to the drive in response to an input demand such as a demanded speed or torque. Control methods (which can be implemented separately or in combination) include varying the gain of an estimator as a function of a demanded or estimated speed to position control system poles at desired locations, decoupling control system currents to achieve a constant torque with motor speed, compensating flux estimates of the estimator for saturation operation of the stator, estimating rotor position using averages of sample values of energization feedback, and calculating a trim adjusted speed error from a plurality of speed estimates.

A rotational position-adjusting system (6) for a vertical takeoff and landing aircraft (4). The system (6) includes multiple detectors (60) that generate rotor signals. The rotor signals are indicative of the position of each rotor (8) of the aircraft (4). The rotors (8) provide lift to the aircraft (4). A controller (24) is coupled to the detectors (60) and adjusts the rotational speed of one or more of the rotors (8) in response to the rotor signals.

Control systems and methods that provide a high degree of vertical measurement accuracy for a body in motion are disclosed. The systems employ an inertial sensor system for vertical measurement and a Global Navigation Satellite System that includes multipath reduction or attenuation to provide corrected vertical information for a moving body to the inertial sensor system. The combination of these systems enables the maintenance of an accurate vertical position for said body.

The invention relates to an industrial applied guide-way linear-electric machine feed platform of driving magnetic suspension machine tool, containing guide way stationarily supported on the machine base, moving platform and linear electric machine, where the electric machine is in the center line of the guide way, and the top and bottom surfaces of the guide way are set with bearing electromagnet, two side surfaces of the guide way are set with guiding electromagnet, the bearing and guiding electromagnets are stationarily linked with the moving platform, both set with displacement sensors and linked with a control system of the moving platform. It largely heightens the platform feed speed and precision, and has adjustable support rigid damping, no friction, etc.

When an operator operates a pointing device, a direction computing section computes a movement vector from an image photographed by an image sensor, and when the movement vector is larger than a threshold, a direction correcting section determines the movement vector as invalid based on the recognition that the movement vector was caused by an abrupt change in the illumination or other conditions, and outputs only movement vectors that are smaller than the threshold to a coordinate position updating section.

A detector detects at least one of environmental information on the environment and physical information on the user's physical condition, when the user gets into a vehicle. Each of the environment and the physical condition is divided into a plurality of zones. A memory stores statistical data each representing the probability of the user selecting one of the driving positions in the vehicle in one of the zones. One of the driving positions can, from the probabilities allotted to them, be estimated to be optimum for the user in the zone into which the detected information falls. As a result, even if the user's preference in driving position changes with the environment or the user's physical condition in which the user gets into the vehicle, it is possible to adjust the driving position automatically according to the current preference.

In an automatic vehicle position control system, such as a satellite-based agricultural implement steering system, the satellite-based steering information is adjusted with information obtained from one or more path sensors to facilitate the automatic nudging of the vehicle to take account of inaccurate tracking of the agricultural implement relative to its tractor, terrain variations, and inaccuracies in the satellite-based steering system.

The present invention provides a position control system for a remote-controlled vehicle, a vehicle operated by the control system, and a method for operating a remote-controlled vehicle. An electromagnetic energy receiver is configured to receive an electromagnetic beam. The electromagnetic energy receiver is further configured to determine a position of the remote-controlled vehicle relative to a position of the electromagnetic beam. The vehicle is directed to maneuver to track the position of the electromagnetic beam.

A dozer blade control system controls the position of a bulldozer blade, maintaining the blade at a constant position as the dozer travels through a worksite. The control system monitors the angle of the dozer blade with respect to the earth and when it senses that the dozer blade is tilting, it corrects the dozer blade's position by extending or retracting hydraulic cylinders that couple the dozer blade to the chassis of the crawler-tractor. When the dozer chassis pitches forwards, the blade begins to tilt forward and to drop closer to the ground. The control system senses this forward rotation of the blade and retracts the hydraulic cylinders that couple the blade to the chassis, causing the blade to return to and maintain its original position. Conversely, when the dozer chassis pitches backwards and the blade begins to tilt backward and rise higher above the ground, the control system extends the hydraulic cylinders coupling the blade to the chassis and lowers the blade, causing the blade to return to and maintain its original position with respect to the earth.

A rail position control system is provided that controls a conveyor system configuration to accommodate a plurality of differently sized substrates in an apparatus. The rail position control system includes at least one camera, which is mounted on a mounting surface located in close proximity to the conveyor system. The rail position control system further includes a computer system that is operatively coupled to the camera and to a motor. The motor is further coupled to at least one rail of the conveyor system. The camera is operative to view and provide a plurality of images of a conveyor lane width value to the computer system. The conveyor lane width value represents a space located between at least one pair of rails of the conveyor system. The computer system responds by processing the plurality of images of the conveyor lane width value to generate a rail position adjustment value, which is communicated, via control signals, to the motor to actuate the motor to move the at least one rail a distance representing the rail position adjustment value.

A position control system is used for controlling a fluid operated cylinder having at least one fluid chamber defined by a piston located within a housing for movement between first and second end limits of travel. The system includes at least two electrically actuated proportional flow control valves connected to each port of the cylinder for selectively and proportionally controlling fluid flow into and out of the at least one chamber. At least one pressure sensor is provided for measuring fluid pressure with respect to each chamber. At least one discrete position sensor is located adjacent a midpoint of the cylinder for sensing a discrete centered position of the piston. A controller includes a program and is operably connected for controlling actuation of the at least two valves in response to pressure measured by the at least one pressure sensor and location measured by the at least one position sensor.

The invention provides an electronic gear position control system. The electronic gear position control system comprises an electronic gear shifter and a whole car controller. The electronic gear shifter executes the gear shifting operation of a user, obtains a first target gear position corresponding to the gear shifting operation, and returns to the default initial position after gear shifting operation is finished. The whole car controller obtains the current state information of a car, determines that the gear position actually executed by the car currently is the first target gear position when the state information is matched with the first target gear position, and sends the actually executed first target gear position to the electronic gear shifter to be displayed. When the state information is not matched with the first target gear position, a second target gear position actually executed by the car currently is judged according to the state information and the first target gear position, and the actually executed second target gear position is sent to the electronic gear shifter to be displayed. According to the scheme, the electronic gear shifter capable of returning is adopted, the executed gear position is determined through the whole car controller, and the problem that the gear position where an electronic gear shifter handle is located is not consistent with a system gear position is solved.