Patent application number | Description | Published |
20090320805 | HEATER FOR FLUIDS - To improve environmental protection from hydrocarbon emissions particularly from vehicles a heater for fluids comprising heating elements of an electrically conductive monolith, wherein the heater comprises a passageway for the fluid to be heated with a defined flow direction of the fluid during heating operation, the heater comprising at least two heating elements arranged side by side inside the passageway, so that they are arranged in parallel with respect to the fluid flow, is proposed improved in that one of the at least two heating elements is a controlled heating element, which has a slightly larger heating power, and a temperature sensor is provided at or close to the downstream end of the controlled heating element, and wherein the temperature sensor is connected to a control means for temperature control during heating operation of the heater; and a method of operating such | 12-31-2009 |
20090320806 | FUEL VAPOR STORAGE AND RECOVERY APPARATUS - A fuel vapor storage and recovery apparatus includes a fuel vapor storage canister, said fuel vapor storage canister comprising at least first and second vapor storage compartments filled with an absorbent material, for instance filled with activated carbon, at least a vapor inlet port, an atmospheric vent port and a purge port. Said fuel vapor storage canister defines an air flow path between said vapor inlet port and said atmospheric vent port during shut-off of the internal combustion engine of the vehicle. During purging cycles there is defined an air flow path between said atmospheric vent port and said purge port wherein said first and second vapor storage compartments are arranged in concentric relationship and wherein said first and second vapor storage compartments in flow direction are separated from each other by an air gap diffusion barrier. | 12-31-2009 |
20100313763 | Active Carbon Filter for an Internal Combustion Engine - An active carbon filter intended for the fuel supply system of the internal combustion engine of a vehicle consists of a housing ( | 12-16-2010 |
20110139129 | FUEL VAPOR STORAGE AND RECOVERY APPARATUS - A fuel vapor storage and recovery apparatus includes a fuel vapor storage canister, said fuel vapor storage canister comprising at least first and second vapor storage compartments filled with an absorbent material, for instance filled with activated carbon, at least a vapor inlet port, an atmospheric vent port and a purge port. Said fuel vapor storage canister defines an air flow path between said vapor inlet port and said atmospheric vent port during shut-off of the internal combustion engine of the vehicle. During purging cycles there is defined an air flow path between said atmospheric vent port and said purge port wherein said first and second vapor storage compartments are arranged in concentric relationship and wherein said first and second vapor storage compartments in flow direction are separated from each other by an air gap diffusion barrier. | 06-16-2011 |
Patent application number | Description | Published |
20080250868 | Ultrasound Flow Sensor with a Modulo-2Pi for a Remaining Part Tracing - The invention relates to a method for determining the running time (t) of an ultrasound flow sensor ( | 10-16-2008 |
20080271543 | Ultrasonic Flow Rate Meter Having a Pressure Sensor - An ultrasonic flow rate meter and a method for measuring the flow rate with the aid of ultrasound are described, having at least two ultrasonic transducers situated offset in a flow channel in the flow direction for transmitting and receiving ultrasound wave packets, so that ultrasound propagation times from one of the ultrasonic transducers to the other, and vice-versa, can be determined in an electronic part, and having a pressure sensor associated with the flow channel for determining the pressure in the flow channel. Measured values for an engine control that is as accurate as possible are determinable by accurately detecting the incoming air in the intake of a motor vehicle internal combustion engine. | 11-06-2008 |
20080307895 | ULTRASONIC FLOW SENSOR WITH QUADRATURE DEMODULATION - An ultrasonic flow sensor, in particular for determining the flow velocity of a medium flowing through a pipeline, has at least one ultrasonic converter for transmitting and/or receiving ultrasonic signals, an oscillator, which is connected with the ultrasonic converter, and an evaluation unit, which determines a phase shift of the ultrasonic signal that was received, with respect to a reference signal. The evaluation unit includes a plurality of quadrature demodulators, which operate with different demodulation frequencies and each determine phase information about the ultrasonic signal that was received, and when a vernier unit is provided, which determines—based on the individual pieces of phase information—a phase angle or a quantity proportional thereto. | 12-18-2008 |
20090000394 | ULTRASONIC SENSOR WITH RECIPROCAL TRANSMITTING AND RECEIVING CIRCUIT - An ultrasonic sensor has at least two ultrasonic converters for transmitting and receiving ultrasonic signals, connected with a transmitting circuit and a receiving circuit. A switching device is provided, by which the ultrasonic converters are connected in series when in the transmission mode, and they are separated from each other when in the receiving mode. | 01-01-2009 |
20100154560 | METHOD FOR MANUFACTURING AN ULTRASONIC TRANSDUCER - A method for manufacturing an ultrasonic transducer for use in a fluid medium. At least one piezoelectric transducer element is joined directly or indirectly to at least one matching member for promoting vibration coupling between the piezoelectric transducer element and the fluid medium. A matching member is used which has at least one porous molding of a polymer. | 06-24-2010 |
20100288055 | TRANSIT TIME CORRECTION IN A FLOW SENSOR - A sensor measures a flow quantity of a medium using a first wave converter and a second wave converter which faces the first wave converter, each of which emits and receives sound waves, and a device calculates the flow quantity on the basis of a first wave transit time from the first wave converter to the second wave converter, and on the basis of a second wave transit time from the second wave converter to the first wave converter. The device includes a unit for limiting the change to the flow quantity. In this manner, and the measurement may be carried out more accurately. | 11-18-2010 |
20110125024 | ULTRASONIC TRANSDUCER FOR USE IN A FLUID MEDIUM - An ultrasonic transducer for use in a fluid medium includes at least one transducer core having at least one acoustic/electric transducer element. The ultrasonic transducer furthermore includes at least one decoupling element which is configured to reduce a structure-borne noise coupling between the transducer core and a housing. The decoupling element includes at least one porous plastic material, in particular a foamed plastic material. The porous plastic material includes at least one thermosetting polymer and/or at least one thermoplastic. | 05-26-2011 |
20110181322 | Device and method for generating a current pulse - A device for producing a current pulse includes supply terminals for providing a power supply voltage, and a switch which is situated in a control current branch between the supply terminals, which switch is configured to switch a control current through the control current branch as a function of an actuation signal. The device also has a current mirror having a control transistor and a signal transistor, the control transistor being situated in series to the first switch in the control current branch, and the signal transistor being configured to provide the current pulse as a function of the control current through the control transistor. | 07-28-2011 |
20110308317 | METHOD FOR MANUFACTURING AN ULTRASONIC TRANSDUCER FOR USE IN A FLUID MEDIUM - A method for manufacturing an ultrasonic transducer for use in a fluid medium is described. The ultrasonic transducer includes at least one transducer core having at least one acoustic-electric transducer element. The ultrasonic transducer furthermore includes at least one housing which at least partially surrounds the transducer core and which has at least one opening facing the fluid medium. In the method, at least one sealing film is stretched and connected to the housing in the stretched state in such a way that the sealing film at least partially seals the opening. | 12-22-2011 |
20110314933 | ULTRASONIC TRANSDUCER FOR USE IN A FLUID MEDIUM - An ultrasonic transducer is described for use in a fluid medium. The ultrasonic transducer includes at least one piezoelectric transducer element and at least one matching element for promoting an oscillation injection between the piezoelectric transducer element and the fluid medium. The ultrasonic transducer also includes a housing ( | 12-29-2011 |
20120038248 | ULTRASONIC TRANSDUCER FOR USE IN A FLUID MEDIUM - An ultrasonic transducer for use in a fluid medium includes at least one piezoelectric transducer element, at least one matching body for the promotion of a vibrational coupling between the piezoelectric transducer element and the fluid medium, and at least one compensating body situated between the piezoelectric transducer element and the matching body for the reduction of thermal stresses, the compensating body having a coefficient of thermal expansion that is between a coefficient of thermal expansion of the piezoelectric transducer element and a coefficient of thermal expansion of the matching body. | 02-16-2012 |
20120260742 | ULTRASONIC TRANSDUCER FOR USE IN A FLUID MEDIUM - An ultrasonic transducer for use in a fluid medium is proposed. The ultrasonic transducer includes at least one transducer core which has at least one acoustic/electric transducer element, in particular a piezoelectric transducer element. The ultrasonic transducer furthermore includes at least one housing, at least one housing opening being at least partially sealed against the fluid medium with the aid of a sealing film which is connected to the transducer core. The sealing film has at least one expansion deformation which is configured to permit a relative movement between the transducer core and the housing. | 10-18-2012 |
20120266676 | Method and device for improved measurement of ultrasound propagation time difference - A method for measuring a propagation time difference includes: sending a transmitted ultrasound pulse, which is provided with a transmission reference instant and which includes an envelope and a carrier frequency, into a spatial region and receiving a received ultrasound pulse that corresponds to the transmitted ultrasound pulse transmitted. A coarse time difference is provided by comparing the transmission reference instant with an envelope of the received ultrasound pulse, for at least two cycles of transmission/reception in opposite directions of transmission. A fine time difference is provided by comparing the transmission reference instant with an instantaneous variation of the received ultrasound pulse, for the at least two cycles of transmission/reception in opposite directions of transmission. | 10-25-2012 |
20120266677 | ULTRASONIC TRANSDUCER FOR USE IN A FLUID MEDIUM - An ultrasonic transducer for use in a fluid medium includes at least one transducer core having at least one electroacoustic transducer element, and further includes at least one housing having at least two housing parts. At least one first housing part at least partially encloses the transducer core such that a rear side of the electroacoustic transducer element which faces away from the fluid medium is accessible. Furthermore, at least one second housing part is connected to the first housing part. The ultrasonic transducer is essentially terminated by the second housing part on its side, which faces away from the fluid medium. | 10-25-2012 |
20120272749 | Ultrasonic flow sensor for use in a fluid medium - An ultrasonic flow sensor for use in a fluid medium is described. The ultrasonic flow sensor includes at least two ultrasonic converters which are situated in a flow tube offset relative to one another, longitudinally with respect to a flow of the fluid medium. The ultrasonic flow sensor also includes a reflection surface, the ultrasonic converters being set up to exchange ultrasonic signals via simple reflection on the reflection surface. In addition, a deflection device is provided between the ultrasonic converters which is set up to essentially suppress parasitic ultrasonic signals, which are reflected from the reflection surface and which strike the deflection device, by deflection away from the ultrasonic converters. | 11-01-2012 |
20120285260 | Ultrasonic flow sensor for detecting a flow of a fluid medium - An ultrasonic flow sensor for detecting a flow of a fluid medium in a flow tube includes at least one first ultrasonic transducer, at least one second ultrasonic transducer, and at least one waveguide configured to conduct ultrasonic waves between the at least one first ultrasonic transducer and the at least one second ultrasonic transducer by reflection on walls of the waveguide, and to enable the fluid medium to flow through. The ultrasonic waves are able to propagate between the first ultrasonic transducer and the second ultrasonic transducer on at least two ultrasonic paths. Sound energies of the ultrasonic waves transmitted on the at least two different ultrasonic paths differ from one another by no more than a factor of 100. | 11-15-2012 |
20120320713 | ULTRASONIC TRANSDUCER FOR USE IN A FLUID MEDIUM - An ultrasonic transducer for use in a fluid medium includes at least one housing having at least one inner space, at least one transducer core accommodated in the inner space, having at least one electroacoustic transducer element. The housing has at least one opening facing the fluid medium. The opening is covered at least partially by at least one sealing foil. An edge of the sealing foil is sealed by at least one sealing material. | 12-20-2012 |
20130014592 | ultrasonic transducer for use in a fluid mediumAANM Mueller; RolandAACI SteinheimAACO DEAAGP Mueller; Roland Steinheim DEAANM Hueftle; GerhardAACI AspachAACO DEAAGP Hueftle; Gerhard Aspach DEAANM Horstbrink; MichaelAACI Stuttgart-FeuerbachAACO DEAAGP Horstbrink; Michael Stuttgart-Feuerbach DEAANM Lang; TobiasAACI StuttgartAACO DEAAGP Lang; Tobias Stuttgart DEAANM Radwan; SamiAACI StuttgartAACO DEAAGP Radwan; Sami Stuttgart DEAANM Kuenzl; BerndAACI SchwieberdingenAACO DEAAGP Kuenzl; Bernd Schwieberdingen DEAANM Wanja; RolandAACI MarkgroeningAACO DEAAGP Wanja; Roland Markgroening DE - An ultrasonic transducer for use in a fluid medium includes at least one housing, e.g., a sleeve, which has at least one interior space, and at least one transducer core having at least one electroacoustic transducer element is accommodated in the interior space. The housing has a housing wall at least partially enclosing the transducer core using at least one hollow space. | 01-17-2013 |
20130133408 | Ultrasonic transducer for use in a fluid medium - An ultrasonic transducer for use in a fluid medium. The ultrasonic transducer includes at least one housing and at least one transducer core at least partially accommodated in the housing. The transducer core includes at least one acoustic-electric transducer element. At least one damping material is also accommodated in the housing. The damping material includes at least one matrix material, at least one first filler introduced into the matrix material, and at least one second filler introduced into the matrix material. The first filler has a lower specific gravity than the matrix material. The second filler has a higher specific gravity than the matrix material. | 05-30-2013 |