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| Number | Title | Issue Date |
| 7328121 | Vibration data collection method and apparatus The present invention relates to a vibration data collection method and apparatus. The invention includes processes of receiving electrical vibration signals from at least one vibration sensor, digitizing the electrical vibration signals to obtain digitized vibratio... | 02/05/2008 |
| 7127891 | Brake power generator for a hydraulic motor vehicle brake system, and hydraulic motor vehicle brake system A braking force generator includes a primary piston displaceable in a housing to enclose a primary pressure chamber. A pedal simulation device is connected to the force input element. A pedal actuation detection device detects the pedal actuation and an actuating fo... | 10/31/2006 |
| 7048088 | Electric servo-assisted steering system for motor vehicles An electric power assisted steering system for motor vehicles having a worm gear mechanism is operatively connected to a drive shaft of an electric drive motor. A radial load is applied to the worm by a prestressing device, the prestressing device being configured a... | 05/23/2006 |
| 6945352 | Force-based power steering system Apparatus and method is presented for enabling a power steering system comprising an accumulator, a reservoir, and an electronically controlled closed-center control valve assembly for selectively fluidly coupling the accumulator and reservoir to a double-acting pow... | 09/20/2005 |
| 6732629 | Pneumatic actuator circuit Disclosed is a piston positioning system for positioning a piston within a cylinder of a pneumatic circuit. The system comprises a piston position indicator for sensing an actual piston position, a controller for generating an output signal in response to the piston... | 05/11/2004 |
| 6463949 | Method and apparatus for determining a valve status The present invention provides a method and apparatus for detecting a status of a valve, the valve being connected to a fluid circuit. The method includes the steps of establishing an expected value of a characteristic of the fluid of the fluid circuit, d... | 10/15/2002 |
| 6446911 | Method for controlling actuators on a vehicle The present invention is a method that allows controllable devices attached to a vehicle's surface (such as, for example, controllable actuators on an aircraft) to be controlled by a processor or like device in an active-active mode and when a malfunction... | 09/10/2002 |
| 6417640 | Displacement sensors for servo-control actuators A structure comprising firstly a differential sensor of linear displacement comprising a body and a core slidably mounted relative to said body, and secondly a rod of a servo-control actuator in which the core is mounted, said rod terminating in an endpie... | 07/09/2002 |
| 6112638 | Electropneumatic positioner having binary input arrangement providing access to electrical output functions thereof The present invention includes an electropneumatic positioner having an external binary input block which provides access to the electrical output of an integral electronic position controller to control operation of a valve relay. The invention enables m... | 09/05/2000 |
| 6109162 | Control valve system A fluid control valve system for controlling the flow of hydraulic fluid supplied to and discharged out of an actuator having first and second actuator ports, comprising: a valve housing having a pressure sensing chamber for sensing the pressure of the hy... | 08/29/2000 |
| 5953978 | Hydraulic power steering system The invention relates to a hydraulic power steering system for motor vehicles, in the case of which the manual steering wheel is normally connected only by way of a control system with respect to the drive with a servomotor operating the steered vehicle w... | 09/21/1999 |
| 5899064 | Servo-actuator with fail safe means The present invention provides a servo-actuator capable of operating in both the Fail Safe and Fail Operate modes. In the Fail Safe mode, a pretensioned spring member moves a jet pipe in the servo-valve to cause said actuator rod to move in a first direct... | 05/04/1999 |
| 5875818 | Opto-electric/hydraulic servocactuation A method for optical signaling for electrical switch control, and in addition, optical powering of the electrohydraulic servovalve by means of opto-electric conversion using solar cells with a battery backup and dual redundancy for reliability. Optical po... | 03/02/1999 |
| 5845736 | Power steering for motor vehicles In a hydraulic power steering for motor vehicles having a steering control element, a position setting unit connected to the steering control element, a control motor connected to the position setting unit by way of a control circuit and a servo valve hav... | 12/08/1998 |
| 5844390 | Method and apparatus for regulating a fluid operated machine A fluid operated machine is monitored and regulated by providing a logic with a memory for storing the timings of properly operating functions, and detectors the outputs of which are used to calculate the actual operating timings of the functions. The act... | 12/01/1998 |
| 5829335 | Control for hydraulic drive or actuator A control for a hydraulic drive or actuator is provided, wherein the actuator has pressurized operating fluid applied thereto, and wherein the operating fluid is directed through an electrically controlled valve for establishing the amount of operating fl... | 11/03/1998 |
| 5322003 | Modular hydraulic control system A system of modular electrohydraulic servovalves is centrally controlled may be used to control the operation of critical hydraulic actuators. A programmable controller operates a group of modular servovalves which each deliver a portion of the total ac... | 06/21/1994 |
| 5299488 | Active suspension system An actuator for use in an active suspension system is controlled by a valve responsive to differential pressure across the piston of the actuator. The valve operates to allow movement of the piston so as to reduce the pressure differential. The valve is a... | 04/05/1994 |
| 5123331 | Stability compensating circuit of actuator system In a stability compensating circuit of an actuator system which has an actuator that is actuated in response to an input signal and has an object to be controlled by the actuator and includes a vibrational component and wherein the stability of the actuat... | 06/23/1992 |
| 4936196 | Device for resetting servo actuator to neutral position A neutral position resetting device for a servo actuator is described, having reset means that is actuated when the control of the servo actuator by actuator valve means becomes inoperative. The reset means ordinarily separated from a spool of the actuato... | 06/26/1990 |
| 4902947 | Servo circuit with failure detection mechanism A servo circuit with a failure detection mechanism comprising: a servo circuit for servo controlling on the basis of a control signal an actuator which is connected through a hydraulic circuit with a source of oil pressure and is operated by the hydraulic... | 02/20/1990 |
| 4826110 | Oscillatory failure monitor Prevention of actuator oscillation due to failure mode in an aircraft pitch axis control system is provided by an oscillatory failure monitor. The oscillatory failure monitor provides power shutdown of the actuator through inner loop modeling and error si... | 05/02/1989 |
| 4807516 | Flight control system employing three controllers operating a dual actuator An aircraft flight control system for use with a dual or tandem hydraulic actuator coupled to a flight control surface through an actuating rod. Each half of the tandem actuator is controlled by a respective electrohydraulic servovalve. Each electrohydrau... | 02/28/1989 |
| 4667476 | Booster An improved booster for use with a master cylinder in a brake system is proposed which includes a spring for keeping the input shaft away from the booster piston. The spring has one end abutting on a piston acted by the auxiliary pressure from the auxilia... | 05/26/1987 |
| 4612844 | Fail-passive actuator control An actuator of the type used in aircraft flight controls and similar applications is combined with a fail-passive electrohydraulic control system (11) that affords the usual actuator response to electrical input commands during normal operation, and respo... | 09/23/1986 |
| 4596177 | Actuator system A hydraulic fluid powered actuation system preferably for controlling the position of a control surface of an aircraft in response to a plurality of redundant control signals is disclosed. The system comprises an actuator adapted to be mounted in the airc... | 06/24/1986 |
| 4585205 | Fast opening valve apparatus A fast opening valve apparatus includes an electronic sensing circuit to determine when a positional error signal exceeds a predetermined reference value corresponding to an opening rate reference value. The sensing circuit provides a fast open command si... | 04/29/1986 |
| 4567813 | Pressure equalization of multiple valves An equalizer is arranged to continuously sense the control pressures of two valves. In the event of a differential between the control pressures, the equalizer operates to selectively adjust one valve so that the control pressures of both valves will ther... | 02/04/1986 |
| 4561470 | Servo valve control device A control system for a fluid actuated control member is disclosed which uizes a pair of electrically controlled servo valves to control the supply of servo pressure fluid to a control valve piston. The pair of servo valves are electrically controlled suc... | 12/31/1985 |
| 4555974 | Servo actuator control/damping mechanism and method A fluid servo actuator control/damping mechanism and method which utilize and combine the functions of an electro-mechanically driven servo valve to achieve ram or actuator fluid flow and load control even after loss of fluid power as well as the main ram... | 12/03/1985 |
| 4542679 | Multiple loop control system A redundant, dual-fail/operate fly-by-wire control system actuates a redundant tandem piston actuator (10) to provide a single composite output evidenced by movement of a piston rod (12). The basic fault-tolerate actuation system consists of dual hydrauli... | 09/24/1985 |
| 4527954 | Pumping apparatus A multiple-mode, multiplex pumping apparatus includes circuit control elements for initializing the apparatus by placing each of the pistons and plungers in each pumping section of the multiplex pumping apparatus at a respective initial starting point. Th... | 07/09/1985 |
| 4515065 | Automatic centering servo actuator A high resolution servo actuator is responsive to an electronic control or manual control. An output shaft having fast response and infinite positioning for stroking a manual servo valve on a pump is rotated by hydraulic power. A set of hydraulic working ... | 05/07/1985 |
| 4473876 | Electrohydraulic servovalve safety apparatus Safety apparatus for an electrohydraulic servovalve. The safety apparatus includes a digital programmable switch (14) which is programmed to make switching decisions on the basis of whether or not the electrohydraulic servovalve is subjected to an externa... | 09/25/1984 |
| 4456031 | Electro-hydraulic servo valve system An electro-hydraulic servo valve system comprising a two-stage spool type servo valve including a first stage comprising an electrical force motor and a second stage including a spool for controlling flow to an actuator. The force motor is operable upon r... | 06/26/1984 |
| 4447769 | Redundant actuation system A redundant actuator system in which some of the sub-actuators have a lower force capability than the other sub-actuators. The lower force capability sub-actuators are controlled by a common electrical control circuit while the other sub-actuators are eac... | 05/08/1984 |
| 4445421 | Helicopter swashplate controller A redundant swashplate control system includes five or more actuators coupled to the swashplate. A feedback network independently controls each actuator to track a commanded position and a reference ram differential pressure that it related to the ram dif... | 05/01/1984 |
| 4436018 | Multiple loop control system A redundant, dual-fail/operate fly-by-wire control system actuates a redundant tandem piston actuator (10) to provide a single composite output evidenced by movement of a piston rod (12). The basic fault-tolerate actuation system consists of dual hydrauli... | 03/13/1984 |
| 4398242 | Electronic controller A pair of input sense signals are processed and passed to inputs of two servo amplifiers. The amplifier outputs are summed and converted to a corresponding hydraulic pressure in a T-valve. Transducers monitor the produced pressure and provide feedback sig... | 08/09/1983 |
| 4362085 | Flight control system A flight control system is provided for a helicopter furnishing safety feres, and providing back up control in the event of failure of controls of the rotary head swashplate of a helicopter. The swashplate is regulated by a series of actuators which are ... | 12/07/1982 |
