1909 results about "Proportional control" patented technology

A hydraulic circuit may include a proportional control solenoid valve controlling hydraulic pressure such that an operating hydraulic pressure required by the friction member is supplied to the friction member; a supply hydraulic path connecting the proportional control solenoid valve with the friction member, and adapted to supply hydraulic pressure controlled by the proportional control solenoid valve to the friction member; and a switch valve disposed in the supply hydraulic path so as to selectively open / close the supply hydraulic path.

An integrated circuit regulates current flowing from a battery to a load without requiring an external current sense resistor. The IC includes a primary charge pump; a model charge pump; a current sense circuit, a first control circuit to force a voltage level at the output of the model charge pump to be equal to a voltage level at the output of the primary charge pump; and, a second control circuit to force a model current put out by the model charge pump to be equal to a reference current. Current passing through the primary charge pump is regulated at a level established by the capacitance value of an external flying capacitor irrespective of input voltage variation of the battery power source.

A method and device for accessing a broad data field having a fine resolution. The user selects a scale which can be varied. The scale controls a range within the data field. By moving the range to encompass different portions of the data field, the user can scan that portion of the data field. The present invention allows the user to simultaneously select the scale while moving the range over different portions of the data field. Thus, the user can "zoom in" and "zoom out" of different portions of the data field. In one embodiment of the present invention, a particular piece of data within the broad data field can be accessed. First, the scale is selectively varied, thereby controlling a range within the data field. Then, the range is moved to encompass portions of the data field in which the piece of data resides. Next, the scale is successively decreased while, simultaneously, points successively closer to the location are kept with the range. The scale is decreased (i.e., increasing the range's resolution) and the range is moved in this manner until the piece of data is actually accessed.

An RF switch to controllably withstand an applied RF voltage Vsw, or a method of fabricating such a switch, which includes a string of series-connected constituent FETs with a node of the string between each pair of adjacent FETs. The method includes controlling capacitances between different nodes of the string to effectively tune the string capacitively, which will reduce the variance in the RF switch voltage distributed across each constituent FET, thereby enhancing switch breakdown voltage. Capacitances are controlled, for example, by disposing capacitive features between nodes of the string, and / or by varying design parameters of different constituent FETs. For each node, a sum of products of each significant capacitor by a proportion of Vsw appearing across it may be controlled to approximately zero.

The present invention relates to regulating the temperature of a desired medium that is applied to the exterior surface of a mammal. These devices have been used in the past but not with the ability to control the temperature of the desired medium in a predetermined ratio to the temperature of the mammal. With such control, the present invention decreases the change of discomforting the patient when the patient's temperature is being brought to a set point temperature body temperature.

A system and method is provided for an injectable substance delivery device comprising a limiter, shoulder or post, that controls how deep the needle is inserted into the tissue. The limiter is sized in proportions that control the maximum insertion depth of the needle into the tissue without excessively restricting the complete insertion of the needle. The system and method further comprises an normalization or stabilizer ring that prevents distortion of the tissue in the vicinity of the infusion, so that the needle length is the major determining factor as to how deep the infusion is delivered.

The invention belongs to the field of petroleum equipment, and particularly relates to full-automatic intelligent remote controlled well solidifying equipment, and to a remote automatic cement supplying control system for well solidifying equipment. The remote automatic cement supplying control system comprises a control unit, an air compressor, a cement tank and a cement valve. The remote automatic cement supplying control system is characterized in that the control unit comprises an equipment end operating screen, an equipment end PLC processor, a remote control operating screen and a remotecontrol PLC processor; the equipment end operating screen, the equipment end PLC processor, the remote control operating screen and the remote control PLC processor are connected through netting twines; the equipment end PLC processor can remotely control a remote control module for starting and stopping the air compressor, thereby controlling the air compressor through the remote control module;after the air compressor is started, high-pressure air is discharged to the cement tank; the equipment end PLC processor automatically calculates a required cement supplying amount through a preset density of the well solidifying equipment; through comparing the calculated cement supplying amount with a current acquired cement supplying amount, proportion controlling and adjustment of the cementvalve are performed; and furthermore the cement supplying amount of the equipment is controlled.

A method and apparatus for controlling a gas supply to a plasma arc torch uses a proportional control solenoid valve positioned adjacent the torch to manipulate the gas flow to the torch, thereby extending electrode life during arc transfer and shutdown. Swirl ring design can be simplified and gas supply and distribution systems become less complicated. The invention also allows manipulation of shield gas flow to reduce divot formation when making interior cuts. The system can be controlled with a digital signal processor utilizing a feedback loop from a sensor.

Several open-loop calibration techniques for phase-locked-loop circuits (PLL) that provide a process, temperature and divider modulus independence for the loop bandwidth and damping factor are disclosed. Two categories of open-loop techniques are presented. The first method uses only a single measurement of the output frequency from the oscillator and adjusts a single PLL loop element that performs a simultaneous calibration of both the loop bandwidth and damping factor. The output frequency is measured for a given value of the oscillator control signal and the charge-pump current is adjusted such that it cancels the process variation of the oscillator gain. The second method uses two separate and orthogonal calibration steps, both of them based on the measurement of the output frequency from the oscillator when a known excitation is applied to the open loop signal path. In the first step the loop bandwidth is calibrated by adjusting the charge-pump current based on the measurement of the forward path gain when applying a constant phase shift between the two clocks that go to the phase frequency detector, while the integral path is hold to a constant value. During the second step the damping factor is calibrated by adjusting the value of the integral loop filter capacitor based on the measurement of the oscillator output frequency when excited with a voltage proportional with the integral capacitor value, while the proportional control component is zeroed-out.

The invention provides a five-degree of freedom exoskeleton-type upper limb recovery robot interactive recovery training control strategy. The strategy comprises two training patterns corresponding to the different recovery period of a patient, i.e. a passive interactive recovery training control strategy and an active-auxiliary interactive recovery training control strategy; during passive movement, a surface myoelectric signal of relevant muscles on a healthy upper limb of a patient is picked up and taken as the movement intention of the patient, thereby controlling a robot to drive a diseased side to realize movement passive training; during active movement, the movement intention of an upper limb of a human body is judged through acquiring in real time the arthrosis force moment generated by a diseased limb acting on the robot during movement, and an applied force is converted into the velocity quantity of the tail end of a mechanical arm by means of a proportional controller, thereby driving the robot to follow the intention so as to carry out recovery active-auxiliary training of the diseased limb. The five-degree of freedom exoskeleton-type upper limb recovery robot interactive recovery training control strategy can provide all-around recovery training movement for a clinic hemiplegia patient, thereby increasing the activeness of the patient in recovery training and the confidence of the patient in recovery; meanwhile, the recovery training control strategy also increases the attractiveness of a recovery process and promotes recovery efficacy.

A system and related method for a regenerative braking system on a towed vehicle, such as a trailer or semi-trailer. The system provides power and braking to the respective trailer wheels, as needed, to help stabilize the trailer. Power is regenerated during braking. While batteries may be used to store the energy, the system also may use capacitive storage units, which charge and discharge large amounts of energy at a fast rate. A multiple-axis sensor system in conjunction with wheel sensors, load sensors, and proportional control of the brakes and motor power to the axles and wheels, is used to achieve superior load stabilization. The invention can be easily retrofit into new or used trailers, and is self-contained with low maintenance.

A microsurgical system, and a foot controller for the improved operation of a microsurgical system, are disclosed. A surgeon may use the foot controller to simultaneously control multiple surgical parameters based upon movement of a foot pedal of the foot controller in a single plane of motion.

A clock and data recovery circuit having parallel dual path is disclosed, which includes a phase detecting circuit, a first charge pump, a proportional load circuit, a second charge pump, an integration load circuit, and a voltage control oscillating circuit. The phase detecting circuit respectively compares a phase difference between a data signal and a plurality of clock signals to generate two proportional control signal and two integration control signal for respectively controlling the first charge pump and the second charge pump to generate a first current and a second current. The proportional load circuit and the integration load circuit respectively receive the first current and the second current to output a proportional voltage and an integration voltage. The voltage control oscillating circuit adjusts the phase and frequency of the plurality of clock signals in response to the proportional voltage and the integration voltage.

A liquid-based cooling system provides a method of supplying a heated coolant fluid at a relatively constant temperature and pressure to one or more heat driven engines, such as adsorption chillers or heat pumps, by utilizing a proportional flow control device in association with each of a plurality of heat-producing electronic components to optimize the output of a plurality of liquid-cooled cold plates operatively mounted on such plurality of heat-producing electronic components. The proportional flow control devices may be electro-mechanical or solid state proportional control valves for water flow control. The proportion flow control devices are operatively connected to be actuated based upon the electrical signals typically generated to control the variable cooling fans of the electronic components.

An apparatus for traversing obstacles having an elongated, round, flexible body that includes a plurality of segments interconnected by an integrated joint actuator assembly. The integrated joint actuator assembly includes a plurality of bellows-type actuators individually coupling adjacent segments to permit pivotal actuation of the apparatus therebetween. A controller is employed to maintain proper positional control and stiffness control while minimize air flow.

An apparatus is described for controlling flow of fluid in a tubular positioned in a wellbore extending through a subterranean formation. A flow control system is placed in fluid communication with a main tubular. The flow control system has a flow ratio control system and a pathway dependent resistance system. The flow ratio control system has a first and second passageway, the production fluid flowing into the passageways with the ratio of fluid flow through the passageways related to the characteristic of the fluid flow. The pathway dependent resistance system includes a vortex chamber with a first and second inlet and an outlet, the first inlet of the pathway dependent resistance system in fluid communication with the first passageway of the fluid ratio control system and the second inlet in fluid communication with the second passageway of the fluid ratio control system. The first inlet is positioned to direct fluid into the vortex chamber such that it flows primarily tangentially into the vortex chamber, and the second inlet is positioned to direct fluid such that it flows primarily radially into the vortex chamber. Undesired fluids, such as natural gas or water, in an oil well, are directed, based on their relative characteristic, into the vortex primarily tangentially, thereby restricting fluid flow when the undesired fluid is present as a component of the production fluid.

The invention relates to domain of special purpose vehicle and especially to a separate four-wheel steering device of vehicle and controlling means, which is mainly used in steering system of special purpose vehicle to guarantee steering behavior. The device comprises steering knuckle arm, steering hydraulic cylinder, electro-hydraulic proportional control valves, and accumulator, easing valve, hydraulic pump, clarifier and electronic control system. The invention is characterized in that every wheel is controlled by independent oil-hydraulic cylinder, electronic control system comprises steering emulator, signal processor and measuring apparatus of displacement line and hydraulic pump driven by engine in steering hydraulic system controls hydraulic cylinder of steering system via electro-hydraulic proportional control valves of steering system. Hydraulic cylinder connects with linear movement pickup to feed variable of displacement line of hydraulic cylinder back to CPU. System adopts closed-loop control. Control circuit equips system failure diagnosis element to realize alarm when system steering error occurs and steering mode switching control unit to complete steering mode switching of vehicle.

A control valve includes a magnetic pole member. An armature is slidably supported relative to the magnetic pole member for movement between a fully open position and a closed position. A biasing spring is disposed between the magnetic pole member and the armature for forcing the armature away from the magnetic pole member. A coil is placed about the magnetic pole member and the armature for inducing a magnetic field for moving the armature toward the magnetic pole member. One of either of the magnetic pole member or the armature has a recess for non-contactingly receiving the other when the armature moves between the fully open and closed positions. The control valve can be embodied as a normally open valve or a normally closed valve. The use of dual lateral poles and triple lateral poles create a flat magnetic force versus travel curve thereby allowing for greater proportional control of the valve. Additionally, the use of double lateral gaps and triple lateral gaps respectively results in force increases of 21% and 12% respectively. Compounding the force increases results in a net additional force of 36%.

The invention provides a 2D (2-dimensional) hydraulic-power-assisted electro-hydraulic proportional reversing valve, which comprises a valve body, a valve core, a valve sleeve, a linear electro-mechanical converter and a compressive-torsional coupling, wherein the valve core, the compressive-torsional coupling and the linear electro-mechanical converter are coaxially connected; an output shaft of the linear electro-mechanical converter is fixedly connected with an input end of the compressive-torsional coupling; an output end of the compressive-torsional coupling is fixedly connected with the right end of the valve core; a sensitive cavity is formed by the left end of the valve core, the valve sleeve and a left cover plate; a pair of axisymmetric high pressure holes and a pair of axisymmetric low pressure holes are respectively formed on the surfaces of shoulders of the valve core in the sensitive cavity; a pair of axisymmetric sensing channels are arranged on the inner surface of the valve sleeve outside the sensitive cavity; and one end of each receptive channel is communicated with the sensitive cavity, and the other ends of the receptive channels cover areas between adjacent high pressure holes and low pressure holes. The 2D hydraulic-power-assisted electro-hydraulic proportional reversing valve not only has the characteristics of high flow rate, high working pressure, and the like of an ordinary pilot-control type electro-hydraulic proportional valve, but also fulfils a proportional control function like a direct-actuated proportional valve under the circumstance of zero pressure (pressure loss).

An embodiment of the present invention provides a phase locked loop that operates on clock signals derived from an RF clock signal generated by the phase locked loop. A frequency reference input provides a reference clock. A controllable oscillator generates the RF clock signal. A phase detection circuit operates on the reference clock to provide digital phase error samples indicative of a phase difference between the reference clock and the RF clock. A programmable filter is connected to receive the phase error samples and connected to provide a filtered output having a gain and a phase margin to the controllable oscillator. The programmable filter includes a proportional loop gain control having a programmable loop gain coefficient (alpha-α) and an integral loop gain control having a programmable loop gain coefficient (rho-ρ). Alpha and rho are configured to be programmatically changed simultaneously and are selected such that the gain is changed and the phase margin remains substantially unchanged

An electro-hydraulic system for operating a cooling fan and providing hydraulic fluid to a power steering system of the vehicle includes a hydraulic pump unit including first and second fixed displacement pumps and a common drive shaft for these pumps. A hydraulic fluid reservoir is connected to the inlet of each of the pumps. A priority valve is operatively connected to the outlet of the first pump and has an outlet connectible to the power steering system. This valve also has a second outlet connectible to a hydraulic motor for the cooling fan. This valve is arranged to provide a constant flow of hydraulic fluid to the power steering system. A hydraulic line connects an outlet of the second pump to the hydraulic motor. Hydraulic fluid flow through this line is combined with hydraulic fluid flow from the first pump to drive the motor. An electro-hydraulic proportional control valve has an inlet connected to the aforementioned line and an outlet connectible to the reservoir inlet and this control valve controls and limits the rotational speed of the motor. An electronic control device electrically operates and controls the control valve during use of the system.

A control system (1) includes a work piece, such as a camera (2), having an adjustable functionality (3). A configuration device is associated with the work piece and is responsive to one or more control signals (7), the configuration device affects one or more selective adjustments to the adjustable functionality (3). Further included is an input device, such as a mouse (11), for generating one or more input signals (13) in response to one or more predetermined manual inputs (15) from an operator (9). Also a controller (21) is included for providing the control signals (7), the controller (21) being implemented in a graphical user environment and being responsive to the impute signals (13) such that the selective adjustments made to the adjustable functionality (3) are substantially proportional.

A radio control system for a single or multi-controller, single or multi-receiver independently controlled system providing digital and proportional control without mutual interference, especially suited for a miniature toy vehicle. The controller may operate on multiple frequencies (channels) selected by the user. The receivers may receive on multiple frequencies (channels) selected by the user. When the receiver is first turned on, it reads the channel select switch and sets its receiver accordingly then normal remote control signals may be received such as speed, steering and digital commands. Commands are sent in bursts with an error checking protocol implemented. Commands are not executed by the receiver unless they are received error free. If the receiver fails to receive error-free command bursts within a short period of time (less than one second), it shuts off all motors and controls and go into a dormant state awaiting an error-free command burst. If error-free command bursts are not received within an extended period of time such as two minutes, the receiver completely shuts off thereby conserving battery power. The receiver includes a long-life rechargeable battery system that lasts for the normal lifetime of the car. The vehicle includes a simplified steering system that provides full proportional control without requiring position feedback.

An electronically controlled diaphragm pump system is provided. The pump systems comprises a pump housing with a drive gas chamber and a fluid chamber separated by a diaphragm. The drive gas chamber is connected to one or more gas ports for injecting and / or sucking a gas into and out of the gas chamber. The fluid chamber is connected to a least one port for fluid inlet and at least one port for fluid outlet, where the inlet port has a valve adapted to open for fluid inlet when gas is sucked out of the gas chamber and the outlet port has a valve adapted to open for fluid outlet when gas is injected into the gas chamber. The pump system further has gas pressure means connected to a gas inlet port for providing a drive gas pressure in response to a control signal, and gas under-pressure means connected to a gas outlet port for providing a gas under-pressure or sucking of gas in response to a control signal. Furthermore, the pump system has a displacement sensor for detecting displacement or position of the diaphragm, and control circuitry connected to the displacement sensor for determining the displacement or position of the diaphragm and adapted for supplying the control signals to the gas pressure means and the gas under-pressure means. It is preferred that the means for providing a drive gas pressure comprises a gas-pressure proportional control valve being connected to the gas port and the control circuitry, whereby the drive gas pressure is varied as a function of the control signal supplied by the control circuitry. Also the means for providing a gas under-pressure may comprise a gas-under proportional control valve for controlling the gas under-pressure as a function of the control signal supplied by the control circuitry.

A system and method for user configuration of an autotuning algorithm for a PID controller. User input is received via a Graphical User Interface (GUI) indicating a desired characteristic of a PID controller, such as stiffness or response time. The system is excited via a proportional controller to characterize the intrinsic behavior of the system, i.e., to calculate a system transfer function. An autotuning algorithm is configured in accordance with the user input. The configured autotuning algorithm is applied to the transfer function to generate gain values for the PID controller resulting in the PID controller characteristic specified by the user. The PID controller gains are loaded into the PID controller hardware or software, thereby configuring the PID controller to operate according to the desired characteristic specified by the user. The user may trigger and view a step response of the system to review the results of the tuning process.