Class 318/645 - With fluid pressure measuring instruments

Subclass of Class 318 - Electricity: motive power systems
Definition: Subject matter in which the error detecting means is a fluid
No. of patents: 32
Last issue date: 03/04/2008

Number	Title	Issue Date
7339345	Power converter topologies for better traction drive packaging At least three alternative stiff current supply power converter topologies provide fixed current to a respective electric load such as a motor, or a non-inductive electric load using either a current source or a pseudo current source. The stiff current power convert...	03/04/2008
7301299	Injection molding machine and a control method of an injection molding machine An injection molding machine has a control device which controls an input to an incorporated motor. The control device sets a setting value a setting value of the motor to be held for a predetermined setting time. Additionally, the control device determines a reduct...	11/27/2007
7245100	Multi-axis AC servo control system and method A multiple axis servo control implements a multi-tasking PWM control unit to provide PWM signals for multiple axes in a single unit. A time slice mechanism provides axis selection signals based on a system clock signal to permit control parameters of the selected ax...	07/17/2007
7239340	Draw frame including a sliver quality sensing camera A draw frame for drafting a sliver includes a drafting unit having a plurality of roll assemblies spaced from one another in a direction of sliver advance. One of the roll assemblies is an output roll assembly situated at a downstream end of the drafting unit as vie...	07/03/2007
7013646	Auxiliary power system for a motor vehicle An auxiliary power system for a motor vehicle primary engine used to drive primary engine accessories when the primary engine is not operating. The system comprises a secondary engine that drives a hydraulic pump. The hydraulic pump is connected to a hydraulic motor...	03/21/2006
6989646	Multi-axis air/electrical control system A system for allowing a wide selection of components to affect a desired result in the positioning business. Up to nine axes of coordinated motion are offered each of which may use a servomotor, a single or double rod air cylinder. The control for the system is a se...	01/24/2006
6257870	Gas furnace with variable speed draft inducer A method of controlling a variable speed draft inducer motor and fan in a gas furnace. The method comprises the steps of: detecting a first fault driving the motor to a maximum operating range; detecting a second fault forcing the motor to operate towards...	07/10/2001
6192285	Controller for work transfer system A controller for a work transfer system, capable of performing precise positioning of feed bars during sole driving of the transfer system and simplified in structure to contribute to savings in installation space and cost. The controller has a cam angle ...	02/20/2001
6052636	Apparatus and method for positioning an excavator housing An apparatus and method for rotatably positioning a machine housing is disclosed. A pump produces pressurized fluid to a motor that responsively rotates the machine housing. A control valve regulates fluid flow from the pump to the motor. A position senso...	04/18/2000
5652488	Welding electrode holder control A robot welding device with a servo-valve controlled drive for the electrodes and an electrical control for the servo-valves with at least one transducer for actual data on the welding process and an interface for the measurements to a computer unit. By w...	07/29/1997
5568022	Integrated compliance servovalve An integrated compliance electrohydraulic servovalve system connected to a load such as a simulated living being to provide more realistic movement thereto. The system includes a pressure transducer for sensing the pressure appearing at the output of the ...	10/22/1996
5500580	Integrated compliance servovalve An integrated compliance electrohydraulic servovalve system connected to a load such as a simulated living being to provide more realistic movement thereto. The system includes a pressure transducer for sensing the pressure appearing at the output of the ...	03/19/1996
5448148	Apparatus for positioning an excavator housing A method and apparatus for positioning a housing of an excavator housing. A motor receives pressurized fluid to cause rotation of the excavator housing. A motor position sensor determines the rotational position of the housing and responsively produces a ...	09/05/1995
5418438	Draft inducer air flow control A control circuit for a motor driving a fan for inducing a draft in the exhaust of a heating, ventilating and air conditioning (HVAC) system. The control circuit may be used in conjunction with either a variable pressure sensor or one or two discrete pres...	05/23/1995
5415528	Solution pumping for maximizing output while minimizing uneven pumping pressures A solution pumping system is disclosed which is embodied as a disposable pump cassette including a self-contained positive displacement pump, and an associated pump driver including a reciprocable pump piston for driving the pump of the cassette. This sys...	05/16/1995
5196773	Controller for rivetting machine A rivetting machine has a hydraulic cylinder connected with a hydraulic power source, the cylinder including a piston shaft, a motor-driven spindle extending through and journaled to the piston shaft, and a rivet head forming tool secured to the bottom en...	03/23/1993
5055758	Smart fuel pump controller The motor drive circuit has an instrumentation amplifier with a programmable gain set by selectively blowing fuses during initial circuit calibration. The quasi-sawtooth waveform of a relaxation oscillator is compared with the amplified and conditioned si...	10/08/1991
4902952	Cooling apparatus A Stirling cycle cooling engine with separate linear motor drives for the compressor and displacer, the drives being powered by a common oscillator via respective look up table/digital to analog converter circuits and respective displacement regulating se...	02/20/1990
4879501	Constant speed hydrostatic drive system A constant speed hydrostatic drive system is disclosed wherein a generator drive shaft is maintained at a constant speed by utilizing an electro-hydraulic controlled displacement pump responsive to a pressure transducer to control a hydraulic motor. A spe...	11/07/1989
4855659	Electropneumatic position regulator An electropneumatic position regulator having a current/pressure transducer has, as electric input, at least one coil (11) fed with a current (setting signal), as well as a permanent magnet (16) whose relative position is variable as a function of the cur...	08/08/1989
4813339	Pulse-width-modulation control of parallel three-way valves to supply single-acting quick-response actuator Parallel, pulse-width-modulation controlled three-way valves each both supply and exhaust a pressure chamber of a fluid actuator. The phase difference of the oscillator carrier waves of the pulse width modulation input circuit effectively increases the fr...	03/21/1989
4733151	Control system for vibration testing apparatus A load support servomechanism circuit controls the armature of a shaker apparatus. The circuit includes a position sensor, peak detectors connected to outputs of the position sensor, an A/D converter connected to outputs of the peak detectors through a sw...	03/22/1988
4728869	Pulsewidth modulated pressure control system for chemical vapor deposition apparatus A low pressure control system for chemical vapor deposition (CVD) apparatus, including a vacuum pressure chamber and an exhaust pump, is provided by a vacuum pump DC motor which is supplied power from a DC motor speed controller coupled to a DC control in...	03/01/1988
4622503	Variable pneumatic output means for use with ophthalmic micro-surgical instruments A variable pneumatic output device for use with ophthmalic micro-surgical instruments including a reversible servo motor which operates in response to instructions from an electronic control circuit. The rotatable drive shaft of the servo motor is operati...	11/11/1986
4583029	Variable speed resistive network for a pneumatic servo assembly of an electro-pneumatic converter A resistive network is used for an electro-pneumatic converter so that the speed of the electro-pneumatic converter can be regulated. The converter includes a reversible DC servo motor having a pair of terminals connected to a pair of lines. The lines are...	04/15/1986
4459526	Multi apertured lens shock wave probe There is disclosed a system for guiding, positioning, and measuring through robot control, a tool and a work zone relative to each other, by a noncontacting probe of at least one transceiver for generating shock waves, and for sensing their reflections, w...	07/10/1984
4326155	Shockwave probe Probe method and means are disclosed for guiding and positioning a robot-actuated tool, such as a gripper or a welding head, through at least one transceiver for generating and sensing focused shockwaves, the probe being associated with the tool for relat...	04/20/1982
4305028	System for evaluating the capability of a work-performing robot to reproduce a programmed series of motions A system for evaluating whether a work-performing robot can perform a series of programmed motions is disclosed which includes means for continuously comparing the velocity of the various links of a robot simulator, which is manually moved through the seq...	12/08/1981
4284943	Apparatus and method for controlling the speed of an induction motor in a closed-loop system A method and control apparatus are disclosed for maintaining a measured parameter of an environment in a closed-loop system within a range of the desired level for that parameter, to an accuracy greater than that of the parameter measuring device in the c...	08/18/1981
4256998	Electrical control arrangement An electrical control arrangement which includes firstly an electronic transducer, which is adapted to receive a controlled stream of fluid, and secondly control means to be controlled by the electronic transducer to control the speed of a micro-motor in ...	03/17/1981
4081734	Pneumatic fail-safe sensor system for N/C machine tool A pneumatic fail-safe sensor system including a probe adapted to monitor the outline of a master pattern as the directed cutter spindle system of an N/C machine tool forms a part is disclosed. When the probe impinges on the master pattern to indicate that...	03/28/1978
3969662	Measuring the angular position of a shaft A system for measuring the rotation of a shaft without direct mechanical connection to it uses a digital system to maintain a second shaft that connects to a cylindrical chart recorder in a constant angular position relationship with the measured shaft. T...	07/13/1976

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Class 318/645 - With fluid pressure measuring instruments