With Piston And Cylinder Patents (Class 73/1.68)
  • Patent number: 11149664
    Abstract: A method for monitoring a cylinder pressure sensor, in which method the sensor value is checked for admissibility and inadmissibility in a predefinable crankshaft angle range, when admissibility is detected the cylinder pressure sensor is used further and when inadmissibility is detected the cylinder pressure sensor is deactivated. A first sensor value of the cylinder pressure sensor is set as a start value, and a second sensor value is set as a stop value, a plateau range is determined from the number of sampling steps between the start value and the stop value, and the plateau range is set as decisive for the admissibility or inadmissibility of the sensor values.
    Type: Grant
    Filed: May 3, 2018
    Date of Patent: October 19, 2021
    Assignee: MTU FRIEDRICHSHAFEN GMBH
    Inventors: Tobias Frank, Aron Toth, Horst Weidele
  • Patent number: 8871034
    Abstract: A master verification assembly includes a plurality of plunger devices. Each of the plunger devices includes a piston that is axially moveable between a raised position and a depressed position. When placed in a washing assembly, each of the plunger devices is aligned with a nozzle. The nozzles dispense a cleaning fluid under pressure. An axial force applied by the dispensed cleaning fluid depresses the pistons into the depressed position, whereupon the pistons disposed in the depressed position are axially secured in an indicator position. Upon removal of the master verification assembly from the washing assembly, depressed pistons in the indicator position indicate proper function of the nozzles, whereas pistons disposed in the raised position indicate improperly functioning nozzles.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: October 28, 2014
    Assignee: GM Global Technology Operations LLC
    Inventor: Matthew Kenworthy
  • Patent number: 8540211
    Abstract: A method for partially stroking an emergency valve apparatus is provided. The emergency valve apparatus comprises an actuator (103) and a valve member (101). The apparatus is movable between a first position and a second position. The method comprises the step of initiating a partial stroke movement of the apparatus from the first position towards the second position. A parameter of the fluid acting on the apparatus is measured. Once the measured parameter reaches a threshold value, the partial stroke movement is reversed.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: September 24, 2013
    Assignee: Norgren Limited
    Inventors: Christopher John Wheater, David Horsfield
  • Patent number: 8281641
    Abstract: A Self-Contained Breathing Apparatus (SCBA) regulator is tested using a breath simulator having (i) a cup-shaped housing defining an interior volume and an open end, and (ii) an empty syringe with a plunger disposed therein and terminating in a dispensing tip coupled to the housing for sealed fluid communication with the interior volume thereof.
    Type: Grant
    Filed: August 3, 2009
    Date of Patent: October 9, 2012
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Jack Wooten, Mark Black, Tommy Hosea
  • Patent number: 8117908
    Abstract: The present disclosure relates to a position measuring device for a fluidic cylinder, which includes a cylinder jacket and a piston rod longitudinally movable in the cylinder jacket, wherein the position measuring device includes an evaluation unit which determines the position of the piston rod with respect to the cylinder jacket with reference to the intrinsic capacitance of the capacitor formed by cylinder jacket, piston rod and a dielectric fluid acting as a dielectric.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: February 21, 2012
    Assignee: Liebherr-Elektronik GmbH
    Inventors: Alfred Engler, Nejat Mahdavi, Christian Thuerigen
  • Patent number: 7937985
    Abstract: Checking apparatus for checking operation of a densimeter for medium-voltage or high-voltage equipment having metal casing (4) that is filled with a dielectric gas under pressure; the apparatus comprises a closed chamber (8) suitable for being put into communication with an internal space (5) of the casing (4), and isolation means (10) for isolating the chamber (8) in gastight manner from the internal space (5), in which apparatus said closed chamber (8) has a volume that can be caused to vary, and in which apparatus the densimeter is suitable for detecting at least one pressure threshold in said chamber.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: May 10, 2011
    Assignee: Areva T&D SA
    Inventor: David Chambon
  • Patent number: 7673503
    Abstract: A method for estimating exhaust temperature on an output of an internal combustion engine cylinder, the cylinder including a crankshaft transforming into a rotation a translational movement of a piston mounted sliding in the cylinder, the piston closing a combustion chamber of the cylinder. The exhaust temperature is estimated based on the temperature inside the cylinder at a time of opening of the valve, the temperature inside the cylinder being itself estimated from an angle of rotation of the crankshaft, cylinder pressure, volume of air injected into the cylinder, and flow rate of recycled gases. A method diagnoses a cylinder pressure sensor based on an estimate of the exhaust temperature.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: March 9, 2010
    Assignee: Renault S.A.S.
    Inventors: Pascal Emery, Vincent Talon
  • Patent number: 7628055
    Abstract: A method of determining the zero clearance pressure in a controlled clearance piston gauge. The typical method includes pressurizing the cylinder in which the piston resides to a given system pressure. The jacket pressure is then changed and the exhaust gas pressure build-up rate at different jacket pressures is measured. The zero clearance pressure to be where the exhaust gas pressure build-up rate is zero.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: December 8, 2009
    Assignee: General Electric Company
    Inventor: Kenneth A. Kolb
  • Publication number: 20090019915
    Abstract: A method of determining the zero clearance pressure in a controlled clearance piston gauge. The typical method includes pressurizing the cylinder in which the piston resides to a given system pressure. The jacket pressure is then changed and the exhaust gas pressure build-up rate at different jacket pressures is measured. The zero clearance pressure to be where the exhaust gas pressure build-up rate is zero.
    Type: Application
    Filed: July 17, 2007
    Publication date: January 22, 2009
    Inventor: Kenneth A. Kolb
  • Publication number: 20090007626
    Abstract: An adjusting element with a cylinder which is closed at one end and filled with a fluid under pressure, wherein a piston which is displaceable axially in the cylinder divides the cylinder into a first work space and a second work space, and a piston rod is arranged at one side of the piston and guided out of the other end of the cylinder through the first work space in a sealed manner by a sealing and guiding device. The adjusting element has a measuring device for detecting the piston rod position and the length of extension of the adjusting element.
    Type: Application
    Filed: June 19, 2008
    Publication date: January 8, 2009
    Applicant: Stabilus GmbH
    Inventors: Marian Bochen, Thomas Ehre, Rolf Mintgen
  • Patent number: 7146843
    Abstract: The present invention relates to Deadweight Pressure Testers used for the calibration of air pressure transducers. An air pressure transducer, which is to be calibrated, is set in parallel with the deadweight tester. Air is slowly pumped into the cylinder and the pressure inlet of the said pressure transducer to be calibrated. The air, which enters the cylinder under pressure, exerts a force on the cylindrical piston, thereby lifting the piston and balancing it against the air pressure. This force is balanced by the weights loaded on the top of the cylindrical piston. When the air pressure and the weights balance, the air pressure is known from the weights and the diameter of the cylindrical piston. A thin rubber seal allows for low friction and low air loss providing greater accuracy in measurements.
    Type: Grant
    Filed: December 6, 2005
    Date of Patent: December 12, 2006
    Inventor: Henry G. Dietz
  • Patent number: 7013702
    Abstract: A device, system, and method for determining the sensing performance of pressure-sensing devices. The device generates dynamic pressure waveforms that enable researchers and medical personnel to accurately assess the characteristics and performance of a particular pressure-sensing device. The system and methods allow for comparison of performance between two or more pressure-sensing devices, including catheter tip pressure transducers and fluid-filled catheters. The system may also be used to practice priming and preparing catheters for insertion into a living body, as the system provides immediate feedback that may indicate the presence of air in the system.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: March 21, 2006
    Assignee: Millar Instruments, Inc.
    Inventor: Huntly D. Millar
  • Patent number: 6848292
    Abstract: The present invention relates to system for calibrating plurality of pressure transducers, said system comprising plurality of pressure transducers (13.1 to 13.n) mounted on a mounting means (12) which receives pressure input from a pressure source (11) via a hollow pipe (14) and distributes the pressure evenly to all the pressure transducers, said plurality of pressure transducers are mounted on the mounting means and placed inside a vessel (15) as to vary the temperature of the pressure transducers, said pressure source is also connected to a standard pressure transducer (17) whose temperature is maintained at the same level as that of pressure transducers (13.1 to 13.n).
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: February 1, 2005
    Assignee: Council of Scientific and Industrial Research
    Inventors: Antony Joseph, Vijay Kumar, Shivanand Prabhudesai, Prakash Mehra, Ehrlich Desa, Surekha mahesh Nagvekar
  • Patent number: 6701791
    Abstract: A device for accurately measuring the pressure (Pg) of very highly pressurized gas includes a cylinder (16) having a cylindrical outer surface (16A) and a bore extending through the cylinder and an elongated piston (23) rotatable and vertically movable in the bore, and supporting calibration weights by means of the piston. An internal reservoir (32) is formed by providing a housing (31) to support the cylinder, the housing including a lower portion engaging a bottom portion of the cylinder and a lower peripheral portion of the cylinder and an upper portion engaging an upper peripheral portion of the cylinder, an inner portion of the housing (31) and a portion of the outer surface (16A). An interior of the reservoir (32) is pressurized through a passage (30A) extending from the reservoir to pressurize gas inlet. A passage (34) conducts pressurized oil from the reservoir into a gap between the piston (23) and the bore.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: March 9, 2004
    Assignee: CalAmerica Corp.
    Inventor: Pierre R. Delajoud
  • Patent number: 6688156
    Abstract: The invention relates to a tester for pressure sensors in the wafer compound or isolated pressure sensors having a recess for the pressure sensors as well as means for electrical contacting of the electrical connections of at least one of the pressure sensors. The invention is intended to make it possible to test pressure sensors still in a wafer compound for their function. According to the invention, a pressure head is provided which has an interior space open on one side, the open face of which is capable of being mounted on the pressure sensor in such a way that the interior space is tightly sealed by the latter. In this way a static or dynamic pressure of specified amount and duration can be exerted on the sensor element at least so that the sensor element is moved out of its resting position. At the same time, the electrical connections of the selected pressure sensor are connected with an electrical evaluation unit.
    Type: Grant
    Filed: January 4, 2001
    Date of Patent: February 10, 2004
    Assignee: Karl Suss Dresden GmbH
    Inventors: Claus Dietrich, Botho Hirschfeld, Dietmar Runge, Michael Teich, Stefan Schneidewind
  • Patent number: 6581436
    Abstract: A pressure sensor for measuring a pressure p contains a membrane with a front and a rear clamped into a body. The pressure p can be applied to the rear of the membrane. The front of the membrane is actively linked to a piston. In addition, a force transmitter is present with which a predetermined force can be applied to the piston. For the purpose of re-calibration, the membrane of the pressure sensor can be deformed by the force transmitter under precisely defined conditions and the output signal re-calibrated. A positioner can also be foreseen instead of the force transmitter.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: June 24, 2003
    Assignee: ESEC Trading SA
    Inventor: Eugen Mannhart
  • Patent number: 6321585
    Abstract: Differential pressure generator 100 includes a stacked pair of opposed novel gravity transducers of the inverted-cup falling-cylinder type. First enclosure 21 contains a first gravity transducer 23 and second enclosure 31 contains a second gravity transducer 33. First gravity transducer 23 includes first cylinder 24, and first piston 25. The first cylinder is mounted for gravity-driven, viscosity-limited motion with respect to the first piston to generate a first pressure difference. The second gravity transducer includes a second cylinder and a second piston. The second cylinder is mounted for gravity-driven, viscosity-limited motion with respect to the second piston to generate a second pressure difference. The first cylinder has a displacement volume that is equal to the displacement volume of the second cylinder, and the first cylinder is heavier than the second cylinder. The first pressure difference and the second pressure difference are summed in opposition to produce a reference differential pressure.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: November 27, 2001
    Assignee: AVGI Engineering, Inc.
    Inventor: George E. Sgourakes
  • Patent number: 6170316
    Abstract: A tool for testing pressure/vacuum engine control switches includes a first and second housing. The housings each include inner and outer passages. The housings are attached with the inner passages placed adjacent each other. When attached, the housings form a continuous longitudinal passage. A pressure chamber is attached to the first housing and includes a valve. The valve provides a passage to a testing chamber. The testing chamber includes a receptacle, pressure/vacuum gauge, and a plug. The first housing also includes a vent and a piston/rod arrangement which define a fluid chamber in the first housing. The rod extends from the first housing through the inner passages and partially into the second housing. A seal is provided around the portion of the rod which passes through inner passages. A return spring is provided around the portion of the rod which extends into the second housing. A lock-and-swivel joint is located at the end of the portion of the rod extending into the second housing.
    Type: Grant
    Filed: April 21, 1999
    Date of Patent: January 9, 2001
    Assignee: Clinton L. Aldrich
    Inventor: Jack Aldrich